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User Manual, Volume 3, Configuration and Advanced Operation

1. D Print Prove Lem E e Cancel Ack Space Clear HI p D Ca e D gt m Cc Kl E EI O E E Kl E rm lt N w Product Setup et Ww X kd a Help Display Enter Figure 3 3 Keypad Layout A through Z Keys 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation Example You wish to recall User Display 1 by pressing Gross Meter 1 select the key sequence A L O as shown below USER DISPLAY 1 Key Press ALO Var 1 Tag Var 1 Index Var 1 Dec Continue configuring User Display 1 by entering the description tag index number and decimal position required for each variable Press Gross Meter 1 Index for Meter 1 Flow Rate Display XXXX XX USER DISPLAY 1 Press ALO 1 Tag M1 MSCF 1 Index 7101 1 Dec 2 2 Tag M1 MMSCF 2 Index 5101 2 Dec E Description Tag Index for Meter 1 Batch Barrels Display XXXX XX 3 Tag M1 PRSET 3 Index 5116 Index for Meter 1 3 Dec 2 Description Tag Preset Count 4 Tag M1 MFACT 4 Index 5114 4 Dec 4 4 Tag Display XXXX XX Description Tag Index for Meter 1 Batch F W A M F Display XXXX XX Omni 3 17 Chapter 3 3 18 User Programmable Functions In the preceding example User Display 1 is used to display Meter Run 1 Variable 1 Flow rate in MSCF
2. INFO The 4 digit point numbers referred to in this chapter are Modbus index numbers used to identify each variable Boolean or other within the Modbus database A complete listing and descriptions of database points is included in Volume 4 Chapter 3 1001 through 1024 1025 through 1088 1089 through 1099 1100 through 1199 1200 through 1299 1300 through 1399 1400 through 1499 1500 through 1699 1700 through 1799 1800 through 1899 2100 through 2199 2200 through 2299 2300 through 2399 2400 through 2499 2600 through 2623 2700 through 2759 User Programmable Functions Boolean points are numbered as follows Physical Digital I O Points 1 through 24 Programmable Boolean Points 64 total Programmable Pulse outputs 11 total Meter Run 1 Boolean Points Alarms Status etc Meter Run 2 Boolean Points Alarms Status etc Meter Run 3 Boolean Points Alarms Status etc Meter Run 4 Boolean Points Alarms Status etc Scratchpad Storage for Results of Boolean Statements Command or Status Inputs Station Boolean Flags Alarms Status etc Meter Run 1 Totalizer Roll over Flags Meter Run 2 Totalizer Roll over Flags Meter Run 3 Totalizer Roll over Flags Meter Run 4 Totalizer Roll over Flags Miscellaneous Station Boolean Points Alarms Status etc Miscellaneous Boolean Command and Status Points 2800 through 2876 Station Totalizer Roll over Flags 2877 through 2899 More Miscellaneous Boolean Command and Status
3. 5 1 3 Volumetric Net Flow Rate at Base Conditions Or m hr 5 1 4 Energy Flow Rate at Base Conditions Qg GJ hr 0 xHV Gya Ary 5 1 5 Nomenclature The following symbols are used in the flow rate equations Some of these require further elaboration or calculation which can be found on the following pages in this chapter and in the indicated standards Qm mass flow rate at flowing actual conditions for differential pressure flowmeters in Tonnes per hour Tonnes hr Qy volume gross flow rate at flowing actual conditions for differential pressure flowmeters in cubic meters per hour m hr Op volume net flow rate at base standard reference conditions for differential pressure flowmeters in cubic meters per hour m hr Qe energy flow rate at base standard reference conditions for differential pressure flowmeters in gigajoule per hour Gu hr Ki factor of combined numerical constants and unit conversions m x 4 2 x 3600 C coefficient of discharge dimensionless see 5 1 7 this chapter B diameter beta ratio dimensionless see 5 1 6 this chapter Ey velocity of approach factor dimensionless RN LR fluid expansion factor dimensionless see 5 1 8 this chapter d orifice plate bore throat diameter at flowing temperature conditions in meters see 5 1 6 this chapter AP differential pressure in Pascals Pa which is the static pressure difference measur
4. Qe Energy MMBTU Hr DENf Density of the gas at flowing conditions Ib ft3 calculated using AGA 8 or measured by a suitable gas densitometer Note AGA 11 states that it is not permissible to use the density measured by the Coriolis meter DENb Density of the gas at base conditions b ft3 calculated using AGA 8 or by RD x DENair RD Relative density of the gas at base conditions obtained from either a manual input or a gas chromatograph DENair Density of air at base conditions b ft3 HV Volumetric heating value at base conditions BTU SCF calculated using ISO 6976 AGA 5 GPA 2172 or obtained from a gas chromatograph or manual input E Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B 4 4 Configuration and Advanced Operation Densities and Other Properties of Gas 4 4 1 AGA Report N 8 Compressibility for Natural Gas and Other Related Hydrocarbon Gases Q AGA Report N 8 Documentation References Detailed information on computations performed in conformance to the different editions of this standard can be found in the following AGA Report N 8 versions Second Edition July 1994 2 Printing Catalog N XQ9212 Second Edition November 1992 Catalog MI XQ9212 December 1985 Catalog N XQ1285 OMNI flow computer firmware has been programmed in conformance with the December 1985 November 1992 and July 1994 editions of the American Gas Association Report N2 8 AGA 8 This
5. h Firmware Revisions 23 74 27 74 Configuration and Advanced Operation Omni 3000 6000 Flow Computer User Manual VOLUME 3 Gas Using Orifice Turbine Meter Effective June 2009 Volume 3 Configuration and Advanced Operation ae Volume 3 CONFIGURATION AND ADVANCED OPERATION Contents of Volume 3 FIQGUIES OF VOIUMG 3 cracsintiiatienen a a a aaa Eaa viii About Our TT innn anenai annn naas ankan iaa na aaea aadar ananas aankan Aaaa Maaa nada EEan ix Contacting Our Corporate Headquarters cccccseseecesseneeeeeeeeeeeeeeneeeneeeeseseeneeseneeneeeeees ix Getting User SUPPOMs ncn aie nde SNE ENEE dane ix About the Flow Computer Applications ccccesseeeeeeeseeeeeneeeeeeeeseeeeeeeeeeseeeeeeseeeeeeeees x About the User Marta vesggreus usebgkererunttgek eesekuegCeesueEu EK EEEEEENEAKEREN KEEN estan X Target Audience ecccceesceceeeeecceeeeneeeeeneecaaeeeeaaesaaeeecaaeeeeaaesaaaesaeeesaaesseaaesdeaeesseessaeesseneeeenees D Manta StruUGture rsrsrs seeEefetEe geet gege a eech xi Volume 1 System Architecture and Installation ccceccceceeeeeeee esses seeeeeeeeaeeeeeeeeeeee xi Volume 2 Basic Operation xi Volume 3 Configuration and Advanced Operation xii Conventions Used in this Manual xiii Trademark Heierences AAA xiv Copyright Information and Modifications POliCy s asnssnnnnnnnunnnnunnnnnnnnnnnnnnnnnnnnnnnnnnnnne xiv Warranty Licenses and Product Registration e
6. 3 5 Chapter 3 User Programmable Functions Example 2 Automatic Run Switching for 4 Meter Run Application Object To improve metering accuracy by automatically selecting the correct flow meter run to be active in a multi run application Small turbines need to be protected from over speeding while for best accuracy larger turbines should be valved off when the flow drops below their minimum rate In the example shown except when switching from one flow meter to the other only one flow meter run is active at one time This is one example only The number of runs open for a given application at any flow rate obviously depends on the size of the flow meters used Frrestou bp HICH TRESCH erer THFESHOL et HI BBL LO i Sy E e e THRESH LD RH TIME gt NUMBERS IN PARENTHES CORRE Pc ND TO E SE o POINTS SSIGNED TO THE AE EXAMPLE Figure 3 1 Figure Showing Automatic Four Meter Flow Zone Thresholds Switching is based on the station flow gross flow rate which is compared to preset switching thresholds entered by the user See Meter Station Settings in Chapter 2 Threshold Flags 1 2 and 3 are set and reset according to the actual station flow rate The first task is to identify the 4 zones and assign programmable Boolean points to them This allows us to include them in further Boolean statements Zone 1 NOT Flag 1 AND NOT Flag 2 AND NOT Flag 3 Zone 2 Flag 1 AND NOT Flag 2 AND NOT Flag 3 Zone 3 Fla
7. Enable AGA10 Y N AGA10 Variables will be calculated if the Density method selected as AGA8 1994 Detail method and AGA10 is enabled by selecting Yes as shown above AGA10 variables Velocity of Sound Cp Cv Cp Cv Isentropic Exponent dZ dT Molecular weight and Cmp will be calculated and can be viewed on the computer front panel display with the key press Temp Factor Meter N Enter Heating Value Method Select Enter the method used to calculate the heating value of the gas O AGA 5 1 GPA 2172 96 2 ISO 6976 95 The energy flow of the gas may or may NOT be calculated using the method selected depending upon the manual override value for the entered HV Prod 1 Prod 2 Prod 3 Prod 4 Specific Gravity Enter a minus negative number to instruct the flow computer to calculate density at reference conditions using the AGA 8 equation of state detailed methods only Net volumes are calculated by dividing mass flow by density at reference conditions Otherwise enter a positive override value of specific gravity at reference conditions that will be used together with the density of air entry to calculate density at reference conditions On product 1 only this value is overwritten if SG is to be obtained from Solartron 3098 gravitometer In cases where a chromatograph is used this entry serves as the GC failure override The GC value of SG if available will also be used unless the component number f
8. Enter the pressure engineering units that the high range DP transmitter outputs at 4mA or 1volt or LRV of Honeywell Smart Transmitters L1 Hi DP at 20mA Enter the pressure engineering units that the high range DP transmitter outputs at 20mA or 5 Volts or URV of Honeywell Smart Transmitters This entry only applies to Honeywell digital transmitters connected to an H Type combo module The process variable e pressure is filtered by the transmitter before being sent to the flow computer The time constant used depends on this entry For Differential Pressure Pressure Transmitters enter the selected Damping Code 0 0 seconds 5 2 seconds 1 0 16 seconds 6 4seconds 2 0 32 seconds 7 8 seconds 3 0 48 seconds 8 16 seconds 4 1 seconds 9 32 seconds High DP Select SEES The flow computer will automatically switch over to the signal from the high range DP transmitter when the signal from the low range transmitter exceeds this percent of its range The switch over will not occur if the high range transmitter has failed or is not installed Low DP Select The flow computer will automatically switch over to the signal from the low range DP transmitter when the signal from the high range transmitter falls below this percent of its range The switch over will not occur if the high range transmitter has failed or is not installed Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and A
9. Number of Points Destination Index Transaction 6 Target Slave ID Read Write Source Index Number of Points Destination Index Transaction 7 Target Slave ID Read Write Source Index Number of Points Destination Index Transaction 8 Target Slave ID Read Write Source Index Number of Points Destination Index Transaction 9 Target Slave ID Read Write Source Index Number of Points Destination Index Transaction 10 Target Slave ID Read Write Source Index Number of Points Destination Index Womni Configuration and Advanced Operation 2 37 Chapter 2 Flow Computer Configuration Transaction 11 Target Slave ID Read Write Source Index Number of Points Destination Index Transaction 12 Target Slave ID Read Write Source Index Number of Points Destination Index Transaction 13 Target Slave ID Read Write Source Index Number of Points Destination Index Transaction 14 Target Slave ID Read Write Source Index Number of Points Destination Index Transaction 15 Target Slave ID Read Write Source Index Number of Points Destination Index Transaction 16 Target Slave ID Read Write Source Index Number of Points Destination Index 2 38 YY Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation 2 5 20 Custom Modbus Data Packet Settings INFO Packets defined are
10. PL Dual Pulse Fidelity Check This entry applies only when turbine meters are selected in the entry above Enter Y to enable Level A pulse fidelity and security checking for this meter run API MPMS Chapter 5 Section 5 This can only be achieved with a flowmeter device which is fitted with two pickoffs which produce pulse trains signals which are not coincident The pulse trains must be connected to channels 3 and 4 of an E Type Combo Module The OMNI will continuously compare both pulse trains and alarm any differences of phase or frequency between the pulse trains Totalizing will be unaffected by a failure of either pulse train and simultaneous transients and noise pulses will be rejected with an 85 certainty Enter N if pulse fidelity checking is not to be used DI Womni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation Meter 1 Meter 2 Meter 3 Meter 4 PL DP Low Range I O Point This entry applies only when orifice meters are selected in the entry above Enter the UO point used to input the signal from the low range differential pressure signal for this meter run Duplicate I O assignments can be made when a transducer is shared between meter runs e g forward and reverse flow DP Low Range Tag This entry applies only when turbine meters are selected in the entry above Enter the 8 character tag name used to identify this transmitter on the LCD display PL DP High Range UO Point
11. 10 11 12 13 14 15 16 17 18 19 20 Custom Modbus Data Packet 2 Addressed at 201 L1 Index Points Index Points Index Points Index Points 1 2 3 4 5 6 7 8 Custom Modbus Data Packet 3 Addressed at 401 L1 Index Points Index Points Index Points Index Points 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Dm 50 2327 0003 Rev B Omni 2 39 Chapter 2 Flow Computer Configuration 2 5 21 Archive File Setup Flow Computer Configuration via the Menu Selection Method It is best to use this method when programming an application for the first time as every possible option and variable will be prompted Once a computer is in operation and you become familiar with the application you can decide to use the faster Random Access Method described below Once you have finished entering data in a setup submenu press the Prog key to return to the Select Group Entry screen Proceed as described in this manual for each setup option Time and Date Setup via the Random Access Method Setup entries require that you be in the Program Mode In the Display Mode press the Prog key The Program LED will glow green and the Select Group Entry screen will appear Then press Time Enter and use bat V4 keys to scroll Q NOTE See Technical Bull
12. This entry applies only when orifice meters are selected in the entry above Enter the UO point used to input the signal from the low range differential pressure DP signal for this meter run Duplicate I O assignments can be made when a transducer is shared between meter runs e g forward and reverse flow Enter 0 if stacked DP transmitters are not used DP High Range Tag This entry applies only when turbine meters are selected in the entry above Enter the 8 character tag name used to identify this transmitter on the LCD display PL Temperature I O Point Enter the I O point number used to input the temperature signal for each meter run Duplicate UO assignments are allowed when a sensor is shared by more than one meter run Temperature Transmitter Tag Enter the 8 character tag name used to identify this temperature transducer on the LCD display Temp Transmitter Type Enter the Temperature Transmitter Type 0 DIN RTD probe a 0 0385 1 American RTD probe a 0 0392 2 Honeywell smart transmitter or linear 4 20mA output PL Pressure UO Point Enter the I O point number used to input the pressure signal for each meter run Duplicate I O assignments are allowed when a sensor is shared by more than one meter run Pressure Transducer Tag Enter the 8 character tag name used to identify this pressure transducer on the LCD display 50 2327 0003 Rev B Omni 2 15 Chapter 2 Flow Computer Configuration
13. reference density at base conditions standard reference temperature and pressure in kilograms per cubic meter kom KF K factor in pulses per cubic meter pulses m Mr meter factor dimensionless HV volumetric heating value at reference conditions in megajoule per standard cubic meter Mim Ei 5 10 Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation 5 3 Flow Rate for Gas Coriolis Flowmeters As the Coriolis Meter uses its density value internally to convert mass to actual volume pulses you also cannot configure the Coriolis Meter for volume pulses i e the mass measurement is accurate but the density and therefore the actual volume may not be accurate Omni therefore assumes that it is receiving mass pulses from the Coriolis meter See Omnicom Help F1 under meter configuration Therefore calculations are preformed every 500ms in the flow computer and are as described in AGA11 They are as follows Qm Tonne Hr Coriolis mass pulses per second x 3600 K Factor pulses per kg x 1000 Qf m3 Hr Qm x 1000 DEN Qb m3 Hr Qm x 1000 DENb Qe Qb x HV 1000 where Qm Mass flowrate tonne Hr Qf Volume flowrate at actual conditions m3 Hr also referred to as Gross volume flowrate in the flow computer Qb Volume flowrate at base conditions m3 Hr also referred to as Net volume flowrate in the flow computer Qe Energy GU Hr DENf Density of the
14. reference orifice plate bore diameter or throat at reference temperature in mm linear coefficient of thermal expansion of the orifice plate or nozzle Venturi throat material in mm mm C a Ty temperature of the fluid at flowing conditions in C Tr reference temperature for the orifice plate bore or nozzle Venturi throat diameter in C Meter Tube Pipe Internal Diameter D mm The calculated internal diameter of the meter tube in millimeters at flowing temperature is used in the flow equations to calculate the diameter ratio and the pipe Reynolds number It is the inside diameter of the upstream section of the meter tube computed at flowing temperature and is defined as D D l a T T Where D meter tube internal diameter at flowing temperature in mm Dr reference meter tube internal diameter at reference temperature inmm linear coefficient of thermal expansion of the meter tube material in mm mm C a2 Tf temperature of the fluid at flowing conditions in C Trp reference temperature for the meter tube internal diameter in C Ei a Omni 5 3 Chapter 5 Flow Equations and Algorithms for S I Metric Units Revision 2774 75 Diameter Beta Ratio p Q Dimensionless Values Both the diameter beta ratio and the pipe Reynolds number are dimensionless however consistent units must be used The diameter ratio or beta ratio is defined as the calculated orifice p
15. 4 1 seconds 9 32 seconds 2 56 Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation 2 14 Configuring Differential Pressure 2 14 1 Accessing the Differential Pressure Setup Submenu Meter Differential Pressure Setup via the Random Access Method Setup entries require that you be in the Program Mode In the Display Mode press the Prog key The Program LED will glow green and the Select Group Entry screen will appear Then press D P Enter or D P Meter n Enter or Meter n D P Enter n Meter Run 1 2 3 or 4 Use N W keys to scroll NOTE Differential pressure is expressed as inches of water US units and either kPa or mBar metric units depending upon setting made in the Factor Setup menu Applying the Menu Selection Method in the Select Group Entry screen Program Mode press Setup Enter and a menu similar to the following will be displayed SETUP MENU Temperature Setup Pressure Setup DP Inches of Water _ Use the THAI up down arrow keys to move the cursor to DP Inches of Water and press Enter to access the submenu 2 14 2 Station and Meter Differential Pressure Settings Station Meter 1 Meter 2 Meter 3 Meter 4 Low Alarm Limit EE eee Enter the flowing differential pressure below which the orifice flowmeter low alarm digital point activates High Alarm Limit a Enter
16. OR EX OR S EQUAL IF GOTO G MOVE RANGE INDIRECT COMPARE TIMER FUNCTION e RISING EDGE FALLING EDGE ONE SHOT The function allows a statement to be used to change the state of the Boolean point on the left of the equal sign usually a command point Evaluation precedence is left to right Dm 50 2327 0003 Rev B Omni 3 3 Chapter 3 3 4 User Programmable Functions The Timer Function you can delay activating or deactivating a Boolean point in increments of 100mS ticks to avoid momentary alarms or to allow time for status flags to remain on for extended periods so they can be detected via Modbus reads This operator works in the same manner as the Delay On and Delay Off settings when configuring a digital output To program the Boolean points proceed as follows From the Display Mode press Prog Setup Enter Enter and the following menu will be displayed Misc Setup Password Maint Y Check Modules Y Config Station Y Config Meter n Config PID n Config D A Out n Front Pnl Counters Program Booleans _ Program Variables User Display n Scroll down to Set Boolean Y and enter Y Assuming that no Booleans are as yet programmed the display shows Boolean Point 10xx Note that the cursor is on the line labeled 25 At this point enter the Boolean equation that will cause Boolean point 1025 to be ON True OFF False
17. PL Density UO Point Enter the I O point number used to input the density signal for each meter run Duplicate I O assignments are allowed when a densitometer is shared by more than one meter run Digital pulse densitometers can only be assigned UO point numbers corresponding to the 4 input channel of a B type Combo Module or the 3 and 4 input channels of an E D combo module Density Transducer Tag Enter the 8 character tag name used to identify this density transducer on the LCD display Densitometer Type Enter the Densitometer Type 1 Not applicable 4 20 SG linear 4 20 Density linear gr cc Solartron pulse Sarasota pulse UGC pulse PL Dens Temperature I O Point Enter the I O point number used to input the signal applied to compensate for temperature effects at the densitometer for each meter run If the densitometer has no temperature sensor fitted enter the same UO point assignment as the meter run temperature sensor oo W P Il Dens Temp Transmitter Tag Enter the 8 character tag name used to identify this density temperature transducer on the LCD display Dens Temp Transmitter Type Enter the Densitometer Temperature Transmitter Type 0 DIN RTD probe a 0 0385 1 American RTD probe a 0 0392 2 Honeywell smart transmitter or linear 4 20mA output Meter 1 Meter 2 Meter 3 Meter 4 PL Dens Pressure I O Point Enter the I O point number used to input the signal applied to compensate fo
18. Totalizing and Batching Gross uncorrected volume Net standard conditions volume Mass and Energy totalizers are provided for each meter run and defined station group Separate totalizer sets provide Cumulative non resettable Daily and Batch totalizers The Batch totalizers can be used to provide either weekly monthly or on demand totalizing information PID Control Functions Four independent control loops are provided for control of a primary variable with either high or low override control by a secondary variable Contact closure inputs are activated to provide a startup ramp function for each control loop if needed Primary set point can be adjusted via an analog input a keypad entry or communication link Control loops are not dedicated and may be cascaded Data is processed every 500 msec Master Meter Proving Master Meter proving has been added Meter I O point 4 has to be setup as the Master Meter Input Time Weighted and Flow Weighted Averages Either Flow weighted or time weighted averages for all input variables and correction factors based on daily flow or batch flow are standard Because errors such as entering an incorrect orifice diameter would cause large flow errors and errors in the flow weighted averages time weighted averages are calculated for orifice metering runs Averaging does not occur if the flow rate is zero All variables associated with Turbine metering runs are flow weighted averaged Gas chromat
19. Variable 3 Variable 4 variable User Display 7 Key Press Sequence Tag 17 Variable 2 Variable 3 Variable 4 Variable User Display 8 Key Press Sequence Tag 1 Variable 2 Variable 3 Variable 4 Variable III Index Decimal Points III Index Decimal Points Lt Index Decimal Points Ltt Index Decimal Points III Index Decimal Points 2 27 Chapter 2 2 28 Flow Computer Configuration 2 5 14 Digital UO Point Settings Y TIP Use the blank lines provided next to each configuration option to write down the corresponding settings you enter in the flow computer Some of these entries may not appear on the display or in OmniCom Depending on the various configuration settings of your specific metering system only those configuration options which are applicable will be displayed Config Digital n Assign each physical I O point to a Modbus address of a Boolean variable There are no limitations as to what Boolean points can be assigned to physical I O points Enter 0 zero for Modbus control Assigning as Pulse Outputs Meter and Station Accumulators may be output in the form of pulses Pulse Width Pulse width is measured using 10msec ticks i e 100 1 second Pulse per Unit Pulse per unit entry can be used to provide unit conversion e g entering 4 2 pulses per barrel will give 1 pulse every 10 gallons as there are 42 gallons in a barrel The units of volum
20. computer programs and achieving consistency with GPA 2172 94 and the 1992 edition of AGA Report N 3 Part 3 For reference purposes and as a comparison and contrast exposition of these AGA 8 editions the following is a brief presentation of some aspects applied by the OMNI flow computer which include e Types of Gases Mole Percent Ranges of Gas Mixture Characteristics Natural Gas Compound Identification Codes e Methods for Gas Mixture Characterization e AGA 8 1994 1992 Methods AGA 8 1985 Methods AGA 8 Used to Calculate Density AGA 3 Used to Calculate Mass Flowrate Omni 4 15 Chapter 4 Flow Equations and Algorithms for U S Customary Units Revision 2374 75 Types of Gases The AGA 8 report is intended for natural gases and other related hydrocarbons gases OMNI flow computer programs include calculations and other information from the three latest editions of the AGA Report N 8 at the time of firmware release The following table lists the type of gases the corresponding identification codes assigned to each gas type in the computer program and the mole range of gas mixture characteristics contained in OMNI firmware that have been taken from AGA 8 1994 1992 and 1985 editions Q NOTE The normal range is considered to be zero for these compounds as follows AGA 8 1994 oxygen amp arg n AGA 8 1992 hydrogen carbon monoxide oxygen amp argon Comparative Table of Natural Gas Types Identificat
21. or P 1300 to 2000 psia Temperature Range T 0 88 to 1 09 or t 20 F to 85 F E 1 0 00075 2 2 2 D 0 455 200 1 09 7 0 03249 1 09 T 2 0167 1 09 T 18 028 1 09 T EE DEER m 1 3 1 69 2 17580088 og Pressure Range 7 1 3 to 2 0 or P 1300 to 2000 psia Temperature Range T 0 84 to 0 88 or t 40 F to 20 F Esa E4 Y Pressure Range 7 2 0 to 5 0 or P 2000 to 5000 psia Temperature Range T 0 84 to 0 88 or t 40 F to 20 F Es Es Y Pressure Range 7 2 0 to 5 0 or P 2000 to 5000 psia Temperature Range T 0 88 to 1 09 or t 20 F to 85 F Es E41 Y Pressure Range 7 2 0 to 5 0 or P 2000 to 5000 psia Temperature Range T 1 09 to 1 32 or t 85 F to 200 F 5 22 Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation Es Es U Pressure Range 7 2 0 to 5 0 or P 2000 to 5000 psia Temperature Range T 1 32 to 1 4 or t 200 F to 240 F Y A m 2 A a 2174 Ao a 2 tte 21 Where A 1 71720 2 33123 T 1 56796 T 3 47644 T 1 28603 T A 0 016299 0 028094 T 0 48782 T 0 728221 T 0 27839 T A2 0 35978 0 51419 T 0 16453 T 0 52216 T 0 19687 T A 0 075255 0 10573 T 0 058598 T 0 14416 T 0 054533 T U T 1 32 m 2 8 1 488 m 2 0
22. 3 2 50 2327 0003 Rev B Introduction The computer performs many functions displays and prints large amounts of data but there are always some application specific control functions calculations or displays that cannot be anticipated The OMNI Flow Computer incorporates several programmable features that enable the user to easily customize the computer to fit a specific application e User programmable Boolean Flags and Statements e User programmable Variables and Statements e User configurable Display Screens e User customized Report Templates The first three Items are explained here The last item requires the use of the OmniCom PC configuration software that comes with the flow computer User Programmable Boolean Flags and Statements 3 2 1 What is a Boolean A Boolean point is simply a single bit register within the computer sometimes called a flag which has only two states On or Off True or False 1 or 0 These Boolean flags or points are controlled and or monitored by the flow computer and represent alarms commands and status points Each Boolean point is given an identifying number within the data base of the computer allowing the state On or Off to be monitored or modified by assigning that Boolean point to a physical digital I O point or accessing it via a communication port A maximum of 24 physical digital I O points are available for monitoring limit switches status signals or controlling relays or lamps
23. 6 2 Time and Date Settings cccecccececceeseceeeeecee cesses seeeeeceaeeeeaaeseeneesneeeesaeeseaaeesenees 2 40 Configuring Printers ees GENEE 2 41 2 7 1 Accessing the Printer Setup Gubmen 2 41 2 1 2 Printer ne EE 2 41 Configuring Gas Chromatograph GC Analyzers eccsssseeeeeeeeeeeeneeeeeees 2 43 2 8 1 Accessing the Analyzer Setup Guten 2 43 2 8 2 Analyzer Setting c cceccceeeeeceeeee cence eeeaeeeeeeee cae eeeaaeseeaeecnaeeecaaesseaaesegeeeesaeeseaaeeeenees 2 43 Dm 50 2327 0003 Rev B Omni iii 2 9 2 10 2 11 2 12 2 13 2 14 2 15 2 16 2 17 2 18 2 19 OMNI 6000 OMNI 3000 User Manual Contents of Volume 3 Configuring Premium Billing Threshold Levels Revision 23 74 75 US Gustomary Units e d 1 A 2 46 2 9 1 Accessing Premium Billing Settings cccceccceceseeeeeeeeceeeeeeaeeeeneeseeeesaeeeeaeenenees 2 46 2 9 2 Premium Billing Threshold Gettnge 2 46 Configuring PID Control Outputs ceeeeeeeeeeeeeeeeeeeeeeeeeneeneeeeeeeeeeeeeneeeeeeeeneenees 2 47 2 10 1 Accessing the PID Control Setup Guten 2 47 2 10 2 PID Control Output Settings 0 ee eceeeeeeeeeeeeeeeeaeeceeeeeceaeeeeaaeseeeeeseeeesaeeeeeeeeesaees 2 47 Configuring Meter Specific Gravity Density ccccsesseneeeeeeeeeeneeeeeeeeneeeeeees 2 49 2 11 1 Accessing the Gravity Density Setup Gubmen 2 49 2 11 2 Meter Specific Gravity Density Settings ccceeeeeeceeeeeeee
24. 6 to 67 8 C 1 43 x e Use Downstream Pressure Static pressure of the flowing fluid can be obtained from either the upstream or downstream pressure tap Enter Y if downstream pressure is used Enter N if upstream pressure is used Disable Isentropic Temp Correct Enter Y for Yes to disable the downstream to upstream temperature correction calculation which assumes that an isentropic expansion occurs after the orifice plate The default for this entry is Yes as AGA 3 API 14 3 do NOT mandate the use of this correction This entry should always be Y when the temperature of the fluid is measured upstream of the orifice At high differential pressures across the orifice a significant cooling of the fluid can take place as it decompresses if temperature is measured downstream of the orifice you may choose to ignore this effect by entering Y or correct for this effect by entering N for No The flow computer corrects the downstream temperature to the equivalent upstream am temperature Type of Differential Pressure Taps Enter the Flange or Pipe Tap 0 Orifice corner 4 ASME flow nozzle 1 Orifice pipe 5 Venturi C 0 084 2 Orifice flange 6 Venturi C 0 995 3 Orifice D amp D 2 The flow computer must be informed as to where the differential pressure taps are located on the orifice metering tube Transducer Density Select Enter Y if you have a densitometer transducer meas
25. 8 Editions Applicable to OMNI Flow Computers TYPE OF 1994 1992 Gas ID MoLE RANGE MOLE Wou Cove Cove geg Methane 45 0 to 100 0 0 to 100 0 50 0 to 100 0 Nitrogen 0 to 50 0 0 to 100 0 0 to 50 0 D Mil sch Carbon Dioxide 3 0 to 30 0 0 to 100 0 0 to 50 0 Ethane 0 to 10 0 0 to 100 0 0 to 20 0 N Propane 0 to 5 0 4 7 a f oomo 0 to 1 0 0 to 6 0 Total Butanes Total Butanes 0 to 0 3 0 to 4 0 Total Pentanes Total Pentanes Water Vapor Hydrogen Sulfide Hydrogen Carbon Monoxide Oxygen Iso Butane Normal Butane so Pentane Normal Pentane Normal Hexane Normal Heptane Normal Octane Normal Nonane Normal Decane Helium Argon 0 to 1 0 0 to 1 0 0 to 1 0 0 to 1 0 0 to 1 0 0 to 3 0 Butanes 0 to 2 0 Pentanes pe w k 0 to 0 2 0 to Dew Point Hexane Plus Heavier Hexane Plus Heavie Hydrocarbons Hydrocarbons 0 to 1 0 Hexane Plus Heavier Hydrocarbons ol 6 a E Ea 8 ED Ea BECH ES ES 6 al 8 ER Largon Mal e Ei Womni 5 13 Chapter 5 Flow Equations and Algorithms for S I Metric Units Revision 2774 75 Methods for Gas Mixture Characterization AGA Report N 8 1994 1992 EDITIONS Three methods of characterization of a gas mixture from the AGA 8 1994 1992 editions are available for use on the OMNI Flow Computers the Detailed Method and the Gross Characterization Methods 1 amp 2 The Detailed Characterization Method The g
26. 9 32 seconds For Temperature Transmitters enter the selected Damping Code 0 0 seconds 5 6 3 seconds 1 0 3 seconds 6 12 7 seconds 2 0 7 seconds 7 25 5 seconds 3 1 5 seconds 8 51 5 seconds 4 3 1 seconds 9 102 5 seconds Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation 2 16 Configuring Meter Runs 50 2327 0003 Rev B the Program Mode In the Display Mode press the Prog key The Program LED will glow green and the Select Group Entry screen will appear Then press Meter n Enter n Meter Run 1 2 3 or 4 Use N W keys to scroll Q Meter Run Setup via the Random Access Method Setup entries require that you be in Meter Station Settings without exiting press the W key and you will scroll down through Q Alternate Access to Meter Run Settings from Meter Station Setup After entering the each Meter Run setup entry 2 16 1 Accessing the Meter Run Setup Submenu Applying the Menu Selection Method in the Select Group Entry screen Program Mode press Setup Enter and a menu similar to the following will be displayed SETUP MENU DP Inches of Water Station Setup Meter Run Setup Use the TH up down arrow keys to move the cursor to Meter Run Setup and press Enter to access the submenu 2 16 2 Meter Run Settings Meter 1 Meter 2 Meter 3 Meter 4 Meter ID Enter the ID of the flowmeter up to 8 alphanumer
27. Actuator Any pulse signal can be latched by using a small program similar to the following INFO A list of Modbus database addresses and index numbers is included in Volume 4 of the OMNI User Manual EE BOOLEAN POINT 10xx 1026 is set by 1834 and 25 18348 amp 1026 cleared by 1835 26 1835 amp 1025 50 2327 0003 Rev B Omni 3 9 Chapter 3 3 10 3 3 User Programmable Functions User Programmable Variables and Statements There are 64 user programmable floating point variables within the flow computer numbered 7025 through 7088 The value stored in each of these variables depends on an associated equation or statement These statements are evaluated every 500 msec and the resultant variable values can be displayed on the LCD display printed on a report output to a D A output or accessed via one of the communication ports Typical uses for the variables and statements include providing measurement units conversions special averaging functions limit checking and comparisons 3 3 1 Variable Statements and Mathematical Operators Allowed Q TIP The order of precedence is ABSOLUTE POWER MULTIPLY amp DIVIDE ADD amp SUBTRACT Where operators have the same precedence the order is left to right Q TIP RH Right Hand Variable LH Left Hand Variable Each statement can contain up to 3 variables or constants The following symbols are used to represent the functions Oper
28. KPa 1 mBar Ei YY Omni 2 69 Chapter 2 Flow Computer Configuration 2 70 2 18 Configuring Fluid Data and Analysis of Products Product Setup via the Random Access Method Setup entries require that you be in the Program Mode In the Display Mode press the Prog key The Program LED will glow green and the Select Group Entry screen will appear Then press Product Enter or Product n Enter n Product 1 through 16 Use N W keys to scroll 2 18 1 Accessing the Fluid Data amp Analysis Setup Submenu Applying the Menu Selection Method in the Select Group Entry screen Program Mode press Setup Enter and a menu similar to the following will be displayed SETUP MENU Meter Run Setup Factor Setup FluidData amp Analysis _ Use the L t up down arrow keys to move the cursor to Fluid Data amp Analysis and press Enter to access the submenu 2 18 2 General Fluid Data amp Analysis Product Settings Fluid data and analysis for up to four different gas products can be stored Gas product setup data includes name type of gas component analysis relative density at reference conditions and calculation algorithms to be used when running the product Prod 1 Prod 2 Prod 3 Prod 4 L1 Fluid Name Enter the name of the product up to 8 alphanumeric characters Appears on reports L1 Fluid Type Enter the type of fluid product 0 None 1 Natural
29. Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation ee Chapter 2 Flow Computer Configuration 2 1 2 2 50 2327 0003 Rev B Introduction Configuration data is stored in the computer s battery backed up RAM memory which will retain its data for at least 1 to 2 months with no power applied Configuration data can be entered using one of three methods 1 Configure off line using the OmniCom PC configuration program and then uploading all data at once 2 Configure on line using the OmniCom PC configuration program which uploads each change as it is entered 3 Enter configuration data via the front panel keypad using the Program Mode Methods 1 and 2 require an IBM compatible PC running the OmniCom Configuration Software and are described in Volume 5 and in OmniCom Help Method 3 is described here Configuring with the Keypad in Program Mode 2 2 1 Entering the Program Mode INFO Key presses are denoted in bold face between brackets e g the enter key appears in this manual as Enter While in the Display Mode press the Prog key The front panel Program LED above the key will glow green and the following selection menu will be displayed on the first three lines of the LCD display The 4 line of the display is used to show the user key presses Press Keys to Select Group Entry or Press Prog to Exit 2 2 2 Changing Data Data can be accessed using a sequential l
30. Points Physical Digital I O Points 1001 1024 Each of the physical digital I O points is assigned to a valid Boolean point number as detailed above Points 1700 through 1799 are command inputs which are described later all other point assignments indicate that the I O point is to be set up as an output point Output points which are dedicated as flow accumulator outputs can be set up for pulse widths ranging from 10 msec to 100 sec in 10 msec increments All other output point assignments have associated time ON delay and time OFF delay timers which are adjustable from 0 0 to 1000 sec in 100 msec increments Programmable Boolean Points 1025 1088 There are 64 user flags or Boolean points are available and are controlled by 64 Boolean statements or equations These are provided to perform sequencing and control functions Each statement or equation is evaluated every 100 msec starting at point 1025 and ending at point 1088 The results of these Boolean statements can then assigned to physical digital I O points There are no restrictions as to what Boolean points can be used in a Boolean statement including the results of other Boolean statements or the status of physical I O points Programmable Accumulator Points 1089 1099 There are 11 Programmable points that are used with Variable Points 7089 through 7099 for programming pulse outputs for Digital I O or Front Panel Counters 50 2327 0003 Rev B Volume 3 Co
31. Pressure Setup Submenu Applying the Menu Selection Method in the Select Group Entry screen Program Mode press Setup Enter and a menu similar to the following will be displayed SETUP MENU Grav Density Setup Temperature Setup Pressure Setup Use the THAI up down arrow keys to move the cursor to Pressure Setup and press Enter to access the submenu 2 13 2 Station and Meter Run Pressure Settings Station Meter 1 Meter 2 Meter 3 Meter 4 Low Alarm Limit ee eS Enter the pressure below which the flowmeter low alarm activates Transducer values approximately 5 below this entry fail to low High Alarm Limit eee ee ee Enter the pressure above which the flowmeter high alarm activates Transducer values approximately 10 above this entry fail to high L2 Override Enter the pressure value that is substituted for the live transducer value depending on the override code An displayed along side of the value indicates that the override value is substituted L2 Override Code Enter the Override Code strategy 0 Never use override code 1 Always use override code 2 Use override code on transmitter failure 3 On transmitter failures use last hour s average SC 2 54 Womni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation L1 at 4mA Enter the pressure engineering units that the transmitter outputs at 4mA or 1volt or lower range limit LRV of Honeywell Sma
32. Rp pipe Reynolds number see 4 1 6 this chapter Di a Omni 4 9 50 2327 0003 Rev B Chapter 4 Flow Equations and Algorithms for U S Customary Units Revision 2374 75 4 1 9 Fluid Expansion Factor Referenced to Upstream Pressure Y Q Expansion Factor Referenced to Upstream Pressure Y The flow rate equations for differential pressure flow metering devices always require using the expansion factor referenced to upstream pressure Y even when the static pressure is measured at downstream taps Q Dimensionless Values The calculated fluid expansion factor is dimensionless however consistent units must be used The fluid expansion factor Y is used to take into account the compressibility of the fluid in calculation the flow rate This coefficient is determined from correlating the diameter ratio B the differential pressure AP the flowing isentropic exponent x and the absolute static pressure P at upstream Y conditions This factor is used in the mass flow rate equation for differential pressure metering devices and can be calculated using the following expressions Upstream Expansion Factor for Orifice Plates With Flange Corner D amp D 2 Taps Y 1 0 41 0 35 6 K Where Vu fluid expansion factor based on the absolute static pressure at the upstream tap B diameter beta ratio see 4 1 6 this chapter D ae upstream acoustic ratio K vu ratio of differential pre
33. _ Time Date Setup Station Setup The cursor automatically appears at the Misc Configuration option Press Enter and the following selection menu will be displayed Misc Setup Password Maint Y Check Modules Y Config Station Y Config Meter n Config PID n Config D A Out n Front Pnl Counters Program Booleans Program Variables User Display n Config Digital n Serial I 0 n Peer Peer Comm Y Custom Packet n Archive File n 2 8 Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation 2 5 2 Physical I O Points not Available for Configuration Configuration parameter groups are only prompted as needed Meter runs and transducers which are not assigned to a physical I O point will not be available for configuration In these cases the following message will be displayed If this message is displayed check the I O point assignment for the variable Variable Selected is Not Assigned to a Physical I O Point 2 5 3 Password Maintenance Settings Password maintenance settings can only be entered via the OMNI front panel keypad Enter Y at Password Maint of the Misc Setup menu to open the following entries Q INFO Characters in refer to password levels Characters in refer to key presses corresponding settings you entered in the flow computer Some of these entries may
34. by setting command point 1719 How the hardware is configured Physical I O points 02 and 03 are setup as inputs by assigning them to 1700 see the Command and Status Booleans on a later page They are connected to flow sensing switches on meter runs 1 and 2 respectively The switches activate with flow Physical I O point 04 is connected to a meter fail alarm bell The output is assigned to Programmable Boolean 1027 A delay ONT of 5 seconds is selected to eliminate spurious alarms which would occur during startup and shutdown A delay OFF of 5 seconds is selected to ensure that the alarm bell remains on for at least 5 seconds The Booleans are programmed as follows INFO Booleans 1025 1026 and 1027 are only used as an example here Any unused programmable Booleans can be used for this function differs from Flow Detected Flow Switch 1 Point 02 Boolean Point 1026 is true Meter 2 failed whenever Meter 2 Active Point 1205 differs from Flow Detected Flow Switch 2 Point 03 Boolean Point 1027 is true Meter 1 OR 2 failed whenever point 1025 OR 0126 are true The Boolean Command Bit 1719 is set when Boolean Point 1027 is true Q Notes Boolean Point 1025 is true Meter 1 failed whenever Meier 1 Active Point 1105 True if Meter 1 fails BOOLEAN POINT 10xx 25 1105 1002 26 1205 1003 Request snapshot if 27 1719 1025 1026 either meter fails l 28 True if Meter 2 fails Y Omni
35. code 1 Always use override code 2 Use override code on transmitter failure 3 On transmitter failures use last hour s average L1 at 4mA ee eee ee Enter the temperature engineering units that the transducer outputs at 4mA or 1volt or lower range limit LRV of Honeywell Smart Transmitters L1 at 20mA Enter the temperature engineering units that the transducer outputs at 20mA or 5volts or upper range limit URV of Honeywell Smart Transmitters Ei a Omni 2 53 Chapter 2 Flow Computer Configuration This entry only applies to Honeywell digital transmitters connected to an H Type combo module The process variable i e temperature is filtered by the transmitter before being sent to the flow computer The time constant used depends on this entry For Temperature Transmitters enter the selected Damping Code 0 0 seconds 5 6 3 seconds 1 0 3 seconds 6 12 7 seconds 2 0 7 seconds 7 25 5 seconds 3 1 5 seconds 8 51 5 seconds 4 3 1 seconds 9 102 5 seconds 2 13 Configuring Meter Pressure Q Meter Pressure Setup via the Random Access Method Setup entries require that you be in the Program Mode In the Display Mode press the Prog key The Program LED will glow green and the Select Group Entry screen will appear Then press Press Enter or Press Meter n Enter or Meter n Press Enter n Meter Run 1 2 3 or 4 Use fal V keys to scroll 2 13 1 Accessing the
36. devices is given by the following expressions AP E E x lt P eu fluid expansion factor at upstream pressure conditions Where g2 fluid expansion factor at downstream pressure conditions AP differential pressure Po absolute downstream static pressure of the fluid Flow Rate for Gas Helical Turbine Flowmeters 5 2 1 Volumetric Gross Flow Rate at Flowing Conditions Qy m hr _ Pulses sec Q x 3600 F 5 2 2 Mass Flow Rate at Flowing Conditions Oe Tonnes hr _ Q xp xM Qa ae 5 2 3 Volumetric Net Flow Rate at Base Conditions Q m hr p Q Q x xM b 5 2 4 Energy Flow Rate at Base Conditions Qe GJ hr bx HV Q 2 Gees Chapter 5 Flow Equations and Algorithms for S I Metric Units Revision 2774 75 5 2 5 Nomenclature Qy volumetric gross flow rate at flowing conditions for gas turbine flowmeters in cubic meters per hour m hr Qm mass flow rate at flowing conditions for gas turbine flowmeters in Tonnes per hour Tonnes hr Qb volumetric net flow rate at base conditions for gas turbine flowmeters in cubic meters per hour m hr Qe energy flow rate at base standard reference conditions for gas turbine flowmeters in gigajoule per hour Gd hr Pulses number of pulses emitted from the flowmeter pulse train per second pt fluid density at flowing conditions actual temperature and pressure in kilograms per cubic meter Kg m 2b
37. in in in F Tf temperature of the fluid at flowing conditions in F Tr reference temperature for the meter tube internal diameter in F 2 Di a Omni 4 3 Chapter 4 Flow Equations and Algorithms for U S Customary Units Revision 2374 75 Diameter Beta Ratio p Q Dimensionless Values Both the diameter beta ratio and pipe Reynolds number are dimensionless however consistent units must be used The diameter ratio or beta ratio is defined as the calculated orifice plate bore or nozzle Venturi throat diameter divided by the calculated meter tube internal diameter SN gd Where d orifice plate bore or nozzle Venturi throat diameter at flowing temperature in inches D upstream meter tube pipe internal diameter at flowing temperature in inches Pipe Reynolds Number Rp and Rq The pipe Reynolds number is used in the equation for calculating the coefficient of discharge for differential pressure flowmeters It is a correlating parameter used to represent the change in the orifice plate nozzle or Venturi tube coefficient of discharge with reference to either the meter tube diameter Rp or the bore throat diameter Ry and the fluid mass flow rate its velocity through the orifice the fluid density and the fluid viscosity Pipe Reynolds Number Referenced to the Meter Tube Diameter Rp The following equation applies to orifice nozzle and Venturi differential pressure flow met
38. pulse frequency and calculate gross flow based on and interpolated K Factor derived from the entered data points Use only K Factor 1 in cases where flowmeter linearizing is not required The K Factors associated with the lowest or highest frequency point will be used in cases where the flowmeter frequency is outside of the entered values Frequency Point 1 Enter the flowmeter pulse frequency associated with the corresponding K Factor The frequency points must be entered lowest to highest Hz L1A K Factor 2 Frequency Point 2 L1A K Factor 3 Frequency Point 3 L1A K Factor 4 Frequency Point 4 L1A K Factor 5 Frequency Point 5 L1A K Factor 6 Frequency Point 6 L1A K Factor 7 Frequency Point 7 L1A K Factor 8 Frequency Point 8 L1A K Factor 9 Frequency Point 9 L1A K Factor 10 Frequency Point 10 L1A K Factor 11 Frequency Point 11 L1A K Factor 12 Frequency Point 12 YY Omni 2 65 Chapter 2 2 66 Flow Computer Configuration Meter 1 Meter 2 Meter 3 Meter 4 Meter Factor Enter the meter factor for the turbine flowmeter The meter factor is a multiplier close to 1 0000 included to correct for small changes in flow meter characteristics Net and mass flows are dependent on this number Meter factors are determined by proving the flowmeter against some known standard volume or standard rate Meter Model Enter the model number of the flowmeter up to 8 alphanumeric characters This
39. respond type is involved by the Modbus index number of the data within the OMNI s database The Source Index determines the data type for a write The Destination Index determines the data type for a read Function codes used are 01 Read Multiple Booleans 15 Write Multiple Booleans 03 Read Multiple Variables 16 Write Multiple Variables Gi INFO The OMNI Flow Computer determines what Modbus function code and what data l Y Omni 2 35 Chapter 2 2 36 Flow Computer Configuration Transaction 1 L1 Target Slave ID Each transfer of data is called a transaction Enter the Modbus ID of the other slave involved in the transaction Modbus ID 0 can be used to broadcast write to all Modbus slave devices connected to the peer to peer link Other valid IDs range from 1 247 L1 Read Write Enter R if data will be read from the slave Enter W if data will be written to the slave L1 Source Index Enter the database index number or address of the Modbus point where the data is to be obtained corresponding to the first data point of the transaction This is the slave s database index number when the transaction is a read and the master s database index number when the transaction is a write Refer to Volume 4 for a list of available database addresses or index numbers L1 Number of Points Enter the number of contiguous points to transfer Each transaction can transfer multip
40. the flowing differential pressure above which the orifice flowmeter high alarm digital point activates L2 Override Value i ee EE Enter the pressure value that is substituted for the live transducer value depending on the override code An displayed along side of the value indicates that the override value is substituted L2 Override Code Enter the Override Code strategy 0 Never use override code 1 Always use override code 2 Use override code on transmitter failure 3 On transmitter failures use last hour s average Enter the pressure engineering units that the low range DP transmitter outputs at 4mA or 1volt or LRV of Honeywell Smart Transmitters l Y Omni 2 57 Chapter 2 2 58 Flow Computer Configuration L1 Low DP at 20mA Enter the pressure engineering units that the low range DP transmitter outputs at 20mA or 5 Volts or URV of Honeywell Smart Transmitters Station Meter 1 Meter 2 Meter 3 Meter 4 This entry only applies to Honeywell digital transmitters connected to an H Type combo module The process variable e pressure is filtered by the transmitter before being sent to the flow computer The time constant used depends on this entry For Differential Pressure Pressure Transmitters enter the selected Damping Code 0 0 seconds 5 2 seconds 1 0 16 seconds 6 4seconds 2 0 32 seconds 7 8 seconds 3 0 48 seconds 8 16 seconds 4 1 seconds 9 32 seconds L1 Hi DP at 4mA
41. the fluid in calculation the flow rate This coefficient is determined from correlating the diameter ratio B the differential pressure AP the flowing isentropic exponent x and the absolute static pressure P at upstream s4 or downstream s2 conditions In addition to these variables the pressure ratio is also correlated for fluids flowing through nozzle type and Venturi type devices Expansion Factor at Upstream Conditions s1 The fluid expansion factor at upstream pressure conditions is given by the following expressions Orifice Plates AP e 1 0 41 0 358 KP Where ei fluid expansion factor at upstream pressure conditions B diameter beta ratio AP differential pressure P4 absolute upstream static pressure of the fluid isentropic exponent Nozzles Long Radius Nozzles Venturi Tubes and Venturi Nozzles KT 1 6 jag Zi x 4 2 k S K I Ir l r ei fluid expansion factor at upstream pressure conditions Where x isentropic exponent t pressure ratio P P P absolute upstream static pressure of the fluid Ps absolute downstream static pressure of the fluid 1 B diameter beta ratio 5 8 YY Omni 50 2327 0003 Rev B Volume 3 5 2 50 2327 0003 Rev B Configuration and Advanced Operation Expansion Factor at Downstream Conditions e The fluid expansion factor at downstream pressure conditions for differential pressure flow metering
42. the selected Damping Code 0 0 seconds 5 6 3 seconds 1 0 3 seconds 6 12 7 seconds 2 0 7 seconds 7 25 5 seconds 3 1 5 seconds 8 51 5 seconds 4 3 1 seconds 9 102 5 seconds 2 12 3 Station and Meter Run Density Temperature Settings Meter Density Temperature Setup via the Random Access Method To access these settings in the Program Mode press Density Temp Enter expansion effects which effect the periodic time of oscillation of the densitometer It is also used when desired to calculate the density of the liquid to reference temperature using API 2540 Table 23 23A or 23B Q INFO The Density Temperature sensor is used to compensate for temperature Q NOTE Not Valid when a RTD Probe is specified Station Meter 1 Meter 2 Meter 3 Meter 4 Low Alarm Limit Enter the temperature below which the densitometer low alarm activates Transducer values approximately 5 below this entry activate the transducer fail low alarm High Alarm Limit Enter the temperature above which the densitometer high alarm activates Transducer values approximately 10 above this entry activate the transducer fail high alarm L2 Override Enter the temperature value that is substituted for the live transducer value depending on the override code An displayed along side of the value indicates that the override value is substituted L2 Override Code Enter the Override Code strategy 0 Never use override
43. 0 2327 0008 Rev B Volume 3 Configuration and Advanced Operation For Your information Rt Omni Measure the Difference 50 2327 0003 Rev B About Our Company OMNI Flow Computers Inc is the world s leading manufacturer and supplier of panel mount custody transfer flow computers and controllers Our mission is to continue to achieve higher levels of customer and user satisfaction by applying the basic company values our people our products and productivity OMNI Flow Computers Our products are currently being used world wide at v Offshore oil and gas production facilities v Crude oil refined products LPG NGL and gas transmission lines v Storage truck and marine loading offloading terminals Vv Refineries petrochemical and cogeneration plants Our products have become the international flow computing standard OMNI Flow Computers pursues a policy of product development and continuous improvement As a result our flow computers are considered the brain and cash point of liquid and gas flow metering systems Our staff is knowledgeable and professional They represent the energy intelligence and strength of our company adding value to our products and services With the customer and user in mind we are committed to quality in everything we do devoting our efforts to deliver workmanship of high caliber Teamwork with uncompromising integrity is our lifestyle Contacting Our Corporate Hea
44. 003 Rev B Volume 3 50 2327 0003 Rev B 2 3 Configuration and Advanced Operation Changing Passwords at the Keypad Q INFO Characters in refer to key presses U N 4 At the keypad press Prog Setup Enter With the cursor blinking on Misc Configuration press Enter With the cursor blinking on Password Maint press Enter Enter the Privileged Level Password up to 6 Characters and press Enter The Level 1 1A and Level 2 passwords can now be viewed and changed if required Scroll down to access each of the Modbus serial port Level A passwords These are labeled Serial 1 if Modbus Protocol is selected Serial 2 Serial 3 and Serial A corresponding to the physical port numbering for Modbus Ports 1 2 3 and 4 A INFO See Technical Bulletin 52 0000 0001 TB 960701 in Volume 5 for setting Level B and Level C passwords using OmniCom NOTE Level B and Level C passwords for each Modbus port cannot be viewed or changed from the keypad A INFO The Help System is not limited to just the Program Mode Context sensitive help is available in all modes of operation Getting Help Context sensitive help is available for most data entries Help is summoned by pressing the Display Enter key twice Help key with the cursor on the data field in question Help screens are frequently more than 1 full screen so always use the WJ W keys to scroll in ca
45. 10 a 2 0 0833 m 2 Ei Y Omni 5 23
46. 1000 0 to 100 0 Mass Flow at Full Scale Enter the mass flow rate at full scale for each meter run A 16 bit integer variable representing meter run mass flow rate is included in the database at 3n44 This variable is scaled using this entry and stored as percentage of full scale with a resolution of 0 1 i e 0 to 1000 0 to 100 0 Additional Entries when Turbine Meter Type Selected The following entries apply when a turbine meter is selected in the Config Meter n submenu of the Misc Configuration menu Unless otherwise indicated the password level for these settings is L1 Active Frequency Threshold Enter the Active Frequency Threshold for each meter run Flow meter pulse frequencies equal or greater than this threshold will cause the Meter Active Flag 1n05 to be set By using any Boolean statement you can use this flag bit to enable and disable totalizing by controlling the Disable Meter Run Flags Modbus database points 1736 1737 1738 amp 1739 Example 1030 1736 1105 gt Turn off Meter 1 flow if not greater than Active Frequency Error Check Threshold This entry will display only when Dual Pulse is selected under Config Meter Runs Misc Setup It applies only when a E combo module is fitted and Pulse Fidelity Checking is enabled Enter the Pulse Fidelity Error Check Threshold in Hz for each meter run To eliminate bogus alarms and error count accumulations the dual pulse err
47. 16 1 Accessing the Meter Run Setup Submenu sssssssesssesssesssrsssreserrssrrsennsrnnsennsennsreee 2 63 2116 2 Meter RUM SetiNJS eesg ees geste geeeee geet aeaaaee aaaea Eaa 2 63 Configuring Miscellaneous Factors s sssssssnusnnunnnnunnnnnnnnnnnunnnnunnnnnnnnunnnnnnnnnnnn nnn 2 68 2 17 1 Accessing the Factor Setup Submenu ecccceeeeeeeeeeceeeeeeaeeeeneeseeeesaeeeeaeeeenees 2 68 2 17 22 Factor Settings tinadasc in Sea Ee eda eee to 2 68 Configuring Fluid Data and Analysis of Products ccssssssseeeeeeeeeeeeneeseeeees 2 70 2 18 1 Accessing the Fluid Data amp Analysis Setup Submenu s s s 2 70 2 18 2 General Fluid Data amp Analysis Product Gettnmges ereere 2 70 2 18 3 Additional Settings for Natural Gas Produet 2 72 Configuring Prover EE 2 75 2 19 1 Accessing the Prover Setup Gubmen 2 75 Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation 2 19 2 Prover Settings cecccccceeeeseeceeeeeeceaeeeeaeeseeeeeseaeeeeaaeeeeaeeseaeeesaeessaaeeseeeessaeeseaeeeneees 2 75 User Programmable Functions s eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeseeeeseeeeees 3 1 ie Vise e E E 3 1 3 2 User Programmable Boolean Flags and Statementts cccssssenceeesseeeeneeeeeees 3 1 3 2 1 Wat iS a Boolean EE 3 1 3 2 2 Sign of Analog or Calculated Variables 5001 8999 eee 3 3 3 2 3 Boolean Statements and FUNCTIONS ccecceecceeeeeneeceeeeeeeaeeeea
48. 200 2400 4800 9600 19200 38400 Data Bits 7 or 8 7 for ASCII Modbus 8 for RTU Modbus Stop Bits 0 1 or 2 Parity Bit Odd Even None Transmitter Carrier Key Delay Delays are approximate only O msec 1 50msec 2 100msec 3 150msec Modbus Type Select the protocol type which matches the Modbus master device If the master can support either ASCII or RTU choose RTU protocol as it is approximately twice as efficient as the ASCII protocol Serial Ports 3 and 4 have additional protocol options Modicon Compatible OmniCom will not operate if downloading configuration with this entry set to Y GK E 0 0 Enter 1 2 3 4 5 or 6 at Serial I O n of the Misc Setup menu to open the following entries L1 Baud Rate NEE Computer Default Mode 9600 L1 Number of Stop Bits Computer Default Mode 1 L1 Number of Data Bits Computer Default Mode 8 L1 Parity Bit Even Odd None Computer Default Mode N L1 Transmit Carrier Key Delay Computer Default Mode 0 Enter one of the following options 0 Omsec delay 2 100 msec delay 1 50 msec delay 3 150 msec delay You must enter 0 for Transmitter Carrier Key Delay for any port that will be used with a shared printer L1 Serial Port Type Computer Default Mode 0 This entry corresponds to Serial Port 1 only Enter one of the following options 0 Prin
49. 2172 94 and the 1992 edition of AGA Report N 3 Part 3 For reference purposes and as a comparison and contrast exposition of these AGA 8 editions the following is a brief presentation of some aspects applied by the OMNI flow computer which include e Types of Gases Mole Percent Ranges of Gas Mixture Characteristics Natural Gas Compound Identification Codes e Methods for Gas Mixture Characterization AGA 8 1994 1992 Methods AGA 8 1985 Methods e AGA10 Method available when AGA8 1994 Detailed Method is selected 5 12 YY Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation Types of Gases The AGA 8 report is intended for natural gases and other related hydrocarbons gases OMNI flow computer programs include calculations and other information from the three latest editions of the AGA Report N 8 at the time of firmware release The following table lists the type of gases the corresponding identification codes assigned to each gas type in the computer program and the mole range of gas mixture characteristics contained in OMNI firmware that have been taken from AGA 8 1994 1992 and 1985 editions NOTE The normal range is considered to be zero for these compounds as follows AGA 8 1994 oxygen amp argon AGA 8 1992 hydrogen carbon monoxide oxygen amp argon Comparative Table of Natural Gas Types Identification Codes and Mole Percent Ranges AGA Report N
50. 327 0003 Rev B Configuration and Advanced Operation L1 Flow Average Factor This entry applies only to turbine meters The flow averaging factor is the number of calculation cycles used to smooth the displayed flow rate A number 1 99 will be accepted A calculation cycle is 500msec Alarm Deadband Nuisance alarms can occur when input variables spend any amount of time near the high or low alarm set points These nuisance alarms can swamp the alarm log with useless alarms leaving no room for real alarms This entry sets a percentage limit based on the high alarm entry A variable must return within the high low alarm limits by more than this amount before the alarm is cleared Example High limit is 100 F Low limit is 20 F and Alarm deadband is set to 2 A transducer input which exceeded 100 F will set the high alarm The transducer signal must drop 2 percent below the high alarm setpoint 98 F before the alarm will clear L1 Roll All Totalizers This entry is read only and can only be changed at the keypad of the flow computer Totalizers within the computer can be rolled at 8 or 9 significant digits Totalizer Decimal Place Resolution The following are read only entries that cannot be changed via OmniCom To change totalizer resolution you must first Clear All Totals in the Password Maintenance menu from the front panel keypad of the flow computer You will then be given the opportunity to set the tota
51. 6 1025 1105 Boolean 1026 is true when Boolean 1025 is NOT true OR Point 1105 is true Using the operator the result of a statement can initiate a command E g 1027 1719 1026 P Request a Snapshot Report when Boolean 1026 is true 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation Enter Y at Program Booleans of the Misc Setup menu to open the following password Privileged Level PL entries Boolean Point 10xx Equation or Statement Comment or Remark 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 Dm 50 2327 0003 Rev B Omni 2 21 Chapter 2 Flow Computer Configuration Boolean Point 10xx Equation or Statement Comment or Remark 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 2 22 Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation 2 5 12 Programmable Variable Statements Program Booleans These 64 variable statements are evaluated every 500 msec starting at the statement that determines the value of Points 7025 through 7088 Each statement can contain up to 3 variables or constants Variables can be optionally preceded by the symbol denoting the ABSOLUTE value of the variable is to be used Constants are ident
52. 9 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 Ei 2 24 Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation Prog Variable 70xx Equation or Statement Comment or Remark 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 TIP Use the blank lines provided next to each configuration option to write down the corresponding settings you enter in the flow computer NOTE See Volume 4 for detailed list of Booleans and Status Commands Valid Numeric Variables These are any long integer or floating point number within the database Points 5000 8999 including Boolean variables For the purpose of evaluation Boolean variables have the value of 1 0 if they are True and 0 0 if they are False Dm 50 2327 0003 Rev B Omni 2 25 Chapter 2 2 26 Flow Computer Configuration 2 5 13 User Display Settings Enter 1 through 8 for the selected user display at User Display n of the Misc Setup menu to open the following password Level 1 L1 entries User Display 1 Key Press Sequence C Using the keys marked A through Z enter the sequence of key presses needed to recall the selected user display see the side bar for details A maximum of 4 keys are allowed User key press sequences take priority over any existing resident key press sequences 1 Variable Tag Enter an 8 charact
53. Approach Factor EM 4 5 4 1 8 Discharge Coefficients CA 4 6 4 1 9 Fluid Expansion Factor Referenced to Upstream Pressure Wi 4 10 4 2 Flow Rate for Gas Turbine FIOWMEeteIS ccccesccceeeeeeeeeeeeeeeeeeeneeeeeeeeeeneeeeeeeeees 4 12 4 2 1 Volumetric Gross Flow Rate at Flowing Conditions Ou IMC 4 12 4 2 2 Mass Flow Rate at Flowing Conditions Qm Rbm hbrt ce eeeeeeeeeeeeeeeeeeteeeeteeeeenees 4 12 4 2 3 Volumetric Net Flow Rate at Base Conditions Qy MGCEb 4 12 4 2 4 Energy Flow Rate at Base Conditions Qe MMPBT Uhr 4 12 Dm 50 2327 0003 Rev B Omni v OMNI 6000 OMNI 3000 User Manual vi Contents of Volume 3 4 2 5 Nomenclature cc eceeccceecsneceeeesaeeeeeeaeeeceeaaeeeeecaaeeeceeaaeeeesecsaeeeeeesaeeeecesaeeeesenaeeeeseaas 4 13 4 3 Flow Rate for Gas Coriolis Flowmeters ccccssseecceeseeeeeeeeeeeeeeeeneeeeeeeeeeeeeeeeeess 4 14 4 4 Densities and Other Properties Of GAS cccsceeeeeeseseeeeeeeseeeeeeeseeneeeeesseeeeeeneees 4 15 4 4 1 AGA Report N 8 Compressibility for Natural Gas and Other Related Hydrocarbon EE 4 15 4 4 2 ASME 1967 Steam Equation ur 4 19 4 4 3 Water Density E 4 19 4 4 4 NBS Density Ib CF Viscosity Isentropic Exponent Sound Velocity and Enthalpy4 19 4 4 5 Density and Relative Density Specific Gravity Calculated from Digital Densitometer and Gravitometer Output Frequency c ccccceeeeeeeeeeeeeeeeeeeeeaeeeeaeeseeeeeseaeeeeaeeeenes 4 20 Flow Equati
54. C 0 101325 MPa Density at 0 C 0 101325 MPa CO nwe O O o O Mole Nitrogen Mole Ethane Mole Butanes Method 1 Utilizes the volumetric gross heating value HV relative density mole fraction COs Method 2 Utilizes Relative Density mole fraction No mole fraction COs 5 14 YY Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation AGA Report N 8 1985 EDITION Six methods of characterization of a gas mixture from the AGA 8 1985 edition are available for use on the OMNI Flow Computers the primary method and five alternate methods Primary Characterization Method The primary method is the most accurate method in this AGA 8 version for characterization of natural gas for computations using the equation of state for compressibility factor This method consists of a complete compositional analysis the mole fractions of all components of a natural gas mixture Alternate Characterization Methods An alternate characterization method is used when a complete compositional analysis for a natural gas is not available One of the five alternate methods can be used to estimate the mole fractions of methane and other important hydrocarbons in the natural gas as well as diluents other than carbon dioxide and nitrogen These characterization methods do not include water vapor or hydrogen components Various combinations of the following quantities are utilized e Rea
55. Gas AGA 8 1992 Equation of State 2 Steam ASTM 3 Steam NIST 4 Water Keenan amp Keys 5 Argon NIST 1048 6 Nitrogen NIST 1048 7 Oxygen NIST 1048 8 Hydrogen NIST 1048 9 Ethylene NIST 1048 10 Ethylene IUPAC 11 NIST14 SC DI Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation GC Analyzer Stream Number In many cases a gas chromatograph or gas analyzer will be shared between several meter runs or flow streams When data is transmitted to the flow computer the analyzer will identify which flow stream the analysis data pertains to Enter the number of the flow stream that this meter run should match before using the analysis data Reg Lb FT Reference Density Enter the amount of water that the gas contains in Los MMCF Use Calculate Viscosity Enter a Y to allow the flow computer to calculate the viscosity Enter an N to enable the viscosity data to be entered Use Isentropic Y N Enter a Y to allow the flow computer to calculate the isentropic exponent Enter an N to enable the isentropic exponent to be entered Heating Value BTUSCF Stream Enter a minus negative override value if you want the flow computer to calculate a heating value to calculate energy totals L1 Reference Density This entry is not required when AGA8 is selected Reference density is required to calculate standard volume Enter the density of the gas or water
56. INFO Points 1005 and 1006 reflect the current status of physical I O Points 05 and 06 which could be inputs connected to the outside world or outputs controlling relays etc For example to turn Boolean 1025 ON whenever Boolean 1005 is OFF OR whenever 1006 is ON enter 1005 1006 note the use of the to indicate the NOT function Boolean Point 10XX 25 1005 1006 Boolean 1025 could then be used in the statement following which defines Boolean 1026 For example by including Boolean 1205 which indicates that Meter 2 is active and flowing see following page Boolean 1026 will be ON whenever Meier 2 is active and flowing AND 1005 is NOT ON OR 1006 is ON EI Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation Boolean Point 10xx 25 1005 1006 Rmk 26 120581025 Use the Up Down arrow keys to scroll though all 64 programmable Boolean points Remember that the Boolean statements are evaluated in order starting from 1025 proceeding to 1088 For maximum speed always ensure that statements used in other statements are evaluated ahead of time by placing them in the correct order Example 1 Meter Failure Alarm for Two Meter Run Application Object Using signals from flow sensing switches inserted into the pipeline provide an alarm output which activates whenever the signals from the flow switches and flow meter signals differ also provide a snapshot report
57. Sulfide H2S Hydrogen H2 Carbon Monoxide CO Oxygen O3 i Butane iC 4H10 n Butane nC Hal i Pentane iC H 2 n Pentane n CH n Hexane CH n Heptane C7H n Octane CsH16 n Nonane n Decane Helium He Argon Ar Heating Value SV Specific Gravity SG C6 Distribution C7 Distribution C8 Distribution C9 Distribution C10 Distribution C6 Total Dm 50 2327 0003 Rev B Omni 2 45 Chapter 2 2 46 2 9 Flow Computer Configuration Configuring Premium Billing Threshold Levels Revision 23 74 75 US Customary Units Only Billing settings only apply to Firmware Revision 23 74 US customary units and can only be accessed via the Random Access Method Premium Billing Threshold Level Setup via the Random Access Method Premium Q Setup entries require that you be in the Program Mode In the Display Mode press the Prog key The Program LED will glow green and the Select Group Entry screen will appear Then press Net Setup Enter or Setup Net Enter 2 9 1 Accessing Premium Billing Settings Premium Billing settings can only be accessed via the Random Access Method Valid key press sequences in the Program Mode are Net Setup Enter or Setup Net Enter 2 9 2 Premium Billing Threshold Settings Flow which occurs below Level 1 threshold will be accumulated in the Base Level totalizer Flow occurring between the Level 1 and the Level 2 threshold will accumulat
58. Value Enter the value in engineering units of the secondary variable at controller full scale which is usually 2 times the normal operating setpoint setting Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation 2 11 Configuring Meter Specific Gravity Density 2 11 1 Accessing the Gravity Density Setup Submenu Applying the Menu Selection Method in the Select Group Entry screen Program Mode press Setup Enter and a menu similar to the following will be displayed SETUP MENU Analyser Setup PID Control Setup Grav Density Setup _ Use the J V up down arrow keys to move the cursor to Grav Density Setup and press Enter to access the submenu 2 11 2 Meter Specific Gravity Density Settings Meter Specific Gravity Density Setup via the Random Access Method Setup entries require that you be in the Program Mode In the Display Mode press the Prog key The Program LED will glow green and the Select Group Entry screen will appear Then enter the key press sequence that corresponds to the options you want to configure Specific Gravity To access these settings press S G Enter or S G Meter n Enter or Meter n S G API Enter Density _To access these settings press Density Enter or Density Meter n Enter or Meter n Density Enter Digital Densitometers To access these settings press Factor Density Meter n Enter or De
59. Where De corrected density in kg m DCF density correction factor D uncorrected density kg m Kp pressure constants Py flowing pressure in kPa Pc calibration pressure in kPa Ky temperature constants Ty flowing temperature in C Tc Calibration temperature in C 5 18 Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation Solartron Density kg m Q INFO For Solartron gas density transducers it is NOT necessary to convert the calibration sheet from metric to US customary units Solartron density is calculated using the frequency signal produced by a Solartron frequency densitometer and applying temperature and pressure corrections as detailed below UNCORRECTED DENSITY D K K xt K xt Where D uncorrected density in kg m K K calibration constants supplied by Solartron in kg m and C K t densitometer oscillation time period in microseconds usec TEMPERATURE CORRECTED DENSITY D Dx 1 K T 20 K T 20 Where el 4 ll temperature corrected density in kg m el ll uncompensated density in kg m calibration constants supplied by Solartron TF Temperature in C ACTUAL DENSITY D D x 1 Where Da actual density in kg m Dt temperature compensated density in kg m K calibration constants supplied by Solartron Gas Specific Gravity Ratio
60. aeeeeeeeeseaeeeeaeeeeneeees 3 3 3 2 4 How the Digital I O Assignments are Confgured 3 8 3 3 User Programmable Variables and Statement ccssseeecesseeeeeeeeseneeeeeneeees 3 10 3 3 1 Variable Statements and Mathematical Operators Allowed 3 10 3 3 2 Using Boolean Variables in Variable Giaiements rnnr nn resene nn 3 12 3 3 3 Entering Values Directly into the User Variables c cccsccesseeeeeeeeesseeeesneeeeenees 3 13 3 3 4 Using the Variable Expression as a Promi 3 13 3 3 5 Password Level Needed to Change the Value of a User Variable eseesseesses 3 13 3 3 6 Using Variables in Boolean Expressions ccc cceeeceeeeeeeeeeeeeeeeeeeeeeeaeeeeeeeeeetens 3 14 3 4 User Configurable Display Screens ccccesseeeeeeeeeeeeeeeeeeeeeseneeeeeeeseeseeneeeeeees 3 15 Flow Equations and Algorithms for U S Customary Units Revision 23 74 75 4 1 4 1 Flow Rate for Gas Differential Pressure Devices Orifice Nozzle and Venturi 4 1 4 1 1 Mass Flow Rate at Flowing Conditions Qm Rlbm hbrt 4 1 4 1 2 Volumetric Gross Flow Rate at Flowing Conditions Qy MCF hr esses 4 1 4 1 3 Volumetric Net Flow Rate at Base Conditions Qy MGCEh 4 2 4 1 4 Energy Flow Rate at Base Conditions Qe MMBTU hr ceeceeeeeeeeteeetetteeeeeeees 4 2 4 1 5 Nomenclature NNN 4 2 4 1 6 Diameters and Diameter Correlations esssssssssessisssrrsrrernerrnsstnssrnsstrnntnnstnssrnsnnn 4 3 4 1 7 Velocity of
61. aeeseaees 2 19 2 5 10 Front Panel Counter Settings c cccccceeesceeceeeeeeeeeeeeeeeseeeecaaeeeeaaeseeeeeseeessaeeseenees 2 20 2 5 11 Programmable Boolean Statement cccccccceeseceeseeeeeeeeeeeaeeeeeeeseeeeessaeeesaeeeeeees 2 20 2 5 12 Programmable Variable Statement cccccccseceeeeeseeeeeeeeaeeeeneeseeeeeseaeessaeeeenees 2 23 25 13 User Display Settings vn wetcscasied ue deeER deena uno EEN 2 26 2 5 14 Digital WO Point Settings ceccceceeeceeseeceeeee cee eeeaaeeeeeeeecaeeesaaeeseeeeseeeesaeeseaaeeennees 2 28 Digital UO Point Settings continue 2 29 Digital UO Point Settings continue 2 30 2 5 15 Serial Input Output Geitigs ccc cece cececee cece eeeeeeeeeeeeceeeeeseaeeseaaeeeeeeeseeeessaeeeeenees 2 31 2 5 16 Custom Modbus Data Packet SettingS c cccceccsceeeeeeeceeeeeseeeeseneeeseaeessnaeeeneees 2 33 2 5 17 Programmable Logic Controller Setup ccccecseeeeeseceeeeeeeeaeeeeeeeseeeeeseaeessaeeeenees 2 34 2 5 18 Archive File Getup 2 34 2 5 19 Peer to Peer Communications Settings cccccceeseeceeeeceeeeeeeeeeseeeeeseaeeesaeeeeeees 2 35 2 5 20 Custom Modbus Data Packet Settings cccscesesceceeeeeeeeeeeeeeeeseeeeeseaeessaeeeenees 2 39 2 5 21 Archive File Setup incsiniini dines Seed deed 2 40 Setting Up The Time and Date ccsseecessseeeeeeeseneneeeeseeeeeeeesneeeeeeeseneenensesnees 2 40 2 6 1 Accessing the Time Date Setup Gubmen 2 40 2
62. ain factor used when controlling the secondary variable is the product of this entry and the Primary Gain Factor Tune the primary control variable first and then use this entry to adjust for stable control of the secondary variable l a Omni 2 47 Chapter 2 2 48 Flow Computer Configuration L1 Secondary Integral Factor Enter a value between 0 and 40 00 for the Secondary Integral Factor Repeats Min 1 Integral Factor gt the reciprocal of the reset period PID Startup Stop and Shutdown Ramp Command Points These have been added to eliminate the need to manipulate the PID permissives directly Using these command points greatly simplifies operation of the PID ramping functions See database points 1727 1730 1788 1791 1792 1795 respectively Loop 1 Loop 2 Loop 3 Loop 4 L1 Deadband Enter the dead band percent range PID Control will only compensate for setpoint deviations out of this range The control output will not change as long as the process input and the setpoint error deviation is within this dead band percentage limit range L1 Startup Ramp Enter the maximum percentage to which the valve movement is limited per 500 msec at start up The control output is clamped at 0 until the 17 PID Permissive PID 1 4 gt database points 1722 1725 is set true The control output is then allowed to increase at the start up ramp rate L1 Shutdown Ramp Enter the maximum percentage to which
63. am static pressure of the fluid B diameter beta ratio see 4 1 6 this chapter Dm 50 2327 0003 Rev B Omni 4 11 Chapter 4 Flow Equations and Algorithms for U S Customary Units Revision 2374 75 4 2 Flow Rate for Gas Turbine Flowmeters 4 2 1 Volumetric Gross Flow Rate at Flowing Conditions Qy MCF hr Oe In x 3600 F 4 2 2 Mass Flow Rate at Flowing Conditions Q Klbm hr Qn zt xp XM 4 2 3 Volumetric Net Flow Rate at Base Conditions Q MSCF hr Q Q x xM b 4 2 4 Energy Flow Rate at Base Conditions Qg MMBTU hr _ Q x HV Q Ta S Dei 4 12 YY Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation 4 2 5 Nomenclature Qy Um Qb Qe Pulses br MF HV volumetric gross flow rate at flowing conditions for gas turbine flowmeters in thousands of cubic feet per hour MCF hr mass flow rate at flowing conditions for gas turbine flowmeters in thousands of pounds mass per hour Klb hr volumetric net flow rate at base conditions for gas turbine flowmeters in thousands of standard cubic feet per hour MSCF hr energy flow rate at base standard reference conditions for gas turbine flowmeters in millions of British thermal units per standard cubic foot MMBTU SCF number of pulses emitted from the flowmeter pulse train per second fluid density at flowing conditions actual temperature and pressure in
64. artron 3098 gravitometer is selected as the reference specific gravity transducer type Enter the periodic times in microseconds recorded when measuring the two sample gases X and Y used to determine the calibration constants Ko and K2 for the Solartron 3098 specific gravity transducer Specific Gravity of Reference Gas Y This entry applies only if Solartron 3098 gravitometer is selected as the reference specific gravity transducer type Enter the reference specific gravity of Reference Gas X or Y Sample gases X and Y are used to determine the calibration constants Ko and K2 for the Solartron 3098 specific gravity transducer Time Reference of Gas Y This entry applies only if Solartron 3098 gravitometer is selected as the reference specific gravity transducer type Enter the periodic times in microseconds recorded when measuring the two sample gases X and Y used to determine the calibration constants Ko and K2 for the Solartron 3098 specific gravity transducer Auxiliary Inputs Input 1 Input 2 Input 3 Input 4 Low Limit Enter the auxiliary input signal value below which the Low Alarm activates High Limit Enter the auxiliary input signal value above which the High Alarm activates L2 Override Enter the value in engineering units which will be substituted for the transducer value depending on the override code selected An displayed along side of the value indicates that th
65. as cast convergent section diameter beta ratio see 5 1 6 this chapter pipe Reynolds number see 5 1 6 this chapter Venturi Tube with a Machined Convergent Section C VT y When Where C VTm H Rp C VTm 0 995 lA D lA 250 mm 0 75 6 Rp lt 1x10 50 mm 0 4 2x 10 lA TRH IA lA discharge coefficient for a classical Venturi tube with a machined convergent section diameter beta ratio see 5 1 6 this chapter pipe Reynolds number see 5 1 6 this chapter Venturi Tube with a Rough welded Sheet iron Convergent Section C VTRS When Where C VTRs B Rp C VTRs 0 985 200 mm D 1200 mm 04 lt lt 07 2x10 lt Rp lt 2x10 A IA TR A IA lA discharge coefficient for a classical Venturi tube with a rough welded sheet iron convergent section diameter beta ratio see 5 1 6 this chapter pipe Reynolds number see 5 1 6 this chapter Coefficient of Discharge for Venturi Nozzles C VN Where C VN 0 9858 0 196 B discharge coefficient for Venturi nozzle diameter beta ratio see 5 1 6 this chapter Ei a Omni 5 7 Chapter 5 Flow Equations and Algorithms for S I Metric Units Revision 2774 75 5 1 8 Fluid Expansion Factor e Q Dimensionless Values The fluid expansion factor is dimensionless however consistent units must be used The fluid expansion factor e is used to take into account the compressibility of
66. as phase pressure temperature density behavior of natural gas mixtures is accurately described by the detailed characterization method for a wide range of conditions This behavior can also be accurately described for the pure components methane ethane carbon dioxide nitrogen and hydrogen and binary mixtures of these components A low density correlation was developed for propane and heavier hydrocarbons and binary mixtures of these components with methane ethane nitrogen and carbon dioxide The uncertainty of compressibility factors and density calculations for natural gases from production separators which can contain mole percentages of hexanes plus heavier hydrocarbons greater than 1 is reduced by this method Correlations were developed to reduce the calculation uncertainty of the following e Natural gases containing hydrogen sulfide sour gas correlations of the density behavior of pure hydrogen sulfide and binary mixtures of hydrogen sulfide with methane ethane nitrogen and carbon e Natural gases containing water vapor wet gas second virial correlations for water and binary mixtures of water with methane ethane nitrogen and carbon dioxide Gross Characterization Methods The following table identifies the nominal ranges of gas characteristics for which these methods are used Q NOTE Reference conditions Combustion at 60 F 14 73 psia Density at 60 F 14 73 psia Q NOTE Reference conditions Combustion at 25
67. ation of interest This is the most dynamic and current volume Technical bulletins may be added to this volume after its publication EI Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation Conventions Used in this Manual Several typographical conventions have been established as standard reference to highlight information that may be important to the reader These will allow you to quickly identify distinct types of information 50 2327 0003 Rev B CONVENTION USED 2 Keys Key press Sequences Example Prog Batch Meter n Screen Displays Example Use Up Down Arrows To Adjust Contrast Left Right Arrows To Adjust Backlight Headings Example 2 Chapter Heading 2 3 Section Heading 2 3 1 Subsection Heading Figure Captions Example Figure 2 3 Figure No 3 of Chapter 2 Page Numbers Example 2 8 DESCRIPTION The light bulb icon indicates a tip suggestion or concise information of interest It is highly recommended that you read them Keys on the flow computer keypad are denoted with brackets and bold face characters e g the up arrow key is denoted as Il The actual function of the key as it is labeled on the keypad is what appears between brackets Key press sequences that are executed from the flow computer keypad are expressed in a series of keys separated by a space as shown in the example Sample screens that correspond to the flow computer dis
68. ator Symbol Description ADD Add the two variables or constants SUBTRACT Subtract the RH variable or constant from LH MULTIPLY Multiply the two variables or constants DIVIDE Divide the two variables or constants CONSTANT The number following is interpreted as a constant POWER amp Raise the LH variable to the power of the RH ABSOLUTE Use the abs unsigned value of variable following EQUAL Make the variable on left equal to the expression on the right IF STATEMENT The Logical Value of the variable to the left of the operator is true evaluate the rest of the statement GOTO STATEMENT G Go to a different variable MOVE RANGE Move statement or result to another variable EXACT COMPARE Compare a value with or equal to TOTALIZE a Used to create custom totalizers where Remainders need to be carried into the custom totalizer in the next calculation cycle INDIRECT REFERENCE Use the contents of the point following to Determine the address of the target data base point WRITE ASCII STRING Write the ASCII string data contained between the quotes to the address to the left of the sign RISING EDGE Rising Edge operator e g 7501 FALLING EDGE Falling Edge operator e g 7501 ONE SHOT One Shot operator e g 7501 RANGE CHECKING lt Range checking operator e g 7025 60 lt 7105 lt 75 5 7026 7106 lt 150 Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Op
69. b CF K K calibration constants of density probe entered via the keypad K PR ll densitometer oscillation time period in microseconds usec CORRECTED DENSITY DEEN K D K D K x P pl K D K D K x T T D Where De corrected density in Ib CF DCF density correction factor D uncorrected density in lb CF K K pressure constants K Pf flowing pressure in psig Pc calibration pressure in psig K K temperature constants K Ty flowing temperature in F Te calibration temperature in F Dm 50 2327 0003 Rev B Omni 4 21 Chapter 4 Flow Equations and Algorithms for U S Customary Units Revision 2374 75 Solartron Density kom Q Info For Solartron gas density transducers it is NOT necessary to convert the calibration sheet from metric to US customary units OMNI will display the density in LB FT Solartron density is calculated using the frequency signal produced by a Solartron frequency densitometer and applying temperature and pressure corrections as detailed below UNCORRECTED DENSITY D K K xt K xt Where D uncorrected density in kg m K K calibration constants supplied by Solartron in kom and C K t densitometer oscillation time period in microseconds usec TEMPERATURE CORRECTED DENSITY D Dx 1 K T 20 K T 20 Where el 4 ll temperature corrected density in kg m el ll unc
70. bility and super compressibility factors and densities of natural gas and other hydrocarbon gases Of the three editions the July 1994 edition is considered the most reliable accurate and complete However due to contract requirements or other conditions some users may want to apply an earlier AGA 8 version The December 1985 edition of AGA 8 incorporates improvements to the accuracy of computations compressibility and super compressibility factors beyond the capabilities of AGA s Manual for the Determination of Super compressibility Factors for Natural Gas December 1962 Catalog N L00304 Other improvements included in this version were the expansion in the ranges of gas composition temperature and pressure and applications to gas thermodynamic properties A very significant improvement to this standard is apparent in the AGA 8 November 1992 edition Major changes incorporate more precise computations of compressibility factors and densities of natural gas and related hydrocarbon gases calculation uncertainty estimations and upgraded FORTRAN computer program listings Other improvements include enhanced equations of state more accurate calculations for rich gases based on new velocity of sound data revised correlation methodology The current AGA 8 manual was updated in July 1994 for the purpose of correcting typographical errors found in the previous edition improving the computer programs and achieving consistency with GPA
71. c Gravity G at 60 F and 14 73 psia e Real Gas Gross Heating Value per Unit Volume HV at 60 F and 14 73 psia BTU ft e Mole Fraction of Carbon Dioxide x COz e Mole Fraction of Nitrogen x No e Mole Fraction of Methane x CH These alternate methods yield estimates of the mole fraction of the following e Methane e Ethane e Propane e Normal Butane e lso Butane e Total Pentanes e Total Hexanes plus Heavier Hydrocarbon Gases e Total Diluents other than Nitrogen and Carbon Dioxide The five alternate characterization methods are 1 The Gravity Carbon Dioxide Nitrogen Method 2 The Gravity Heating Value Carbon Dioxide Nitrogen Method 3 The Gravity Heating Value Carbon Dioxide Method 4 The Heating Value Carbon Dioxide Nitrogen Method 5 The Gravity Methane Carbon Dioxide Nitrogen Method 8 4 18 Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation 4 4 2 ASME 1967 Steam Equation vr The OMNI flow computer applies the ASME 1967 steam equation This equation is a closed form solution non iterative developed using reduced properties pressure Pr and temperature parameters ld to define the reduced volume vr of steam 4 4 3 Water Density Gi Acknowledgement The implementation of the Keenan amp Keyes steam tables was based on the work of Don Kyle of Kyle Engineering Inc Water density calculations performed by the OMNI flo
72. c Setup menu to open the following password Level 1 L1 entries n D A Output Assign at 4mA at 20mA Analog Output 1 Under Assign enter the database index number of the variable that will be assigned to the digital to analog output points Under at 4mA and at 20mA enter the required scaling parameters in engineering units at 4mA and 20mA e g For Meter 1 Net Flow Rate assign 7102 Typical scaling might be 4mA 0 0 Bbls hr and 20mA 1000 0 Bbls hr Remark Enter a remark in this 16 character field which identifies and documents the function of each digital to analog output Analog Output 2 Remark Analog Output 3 Remark Analog Output 4 Remark Analog Output 5 Remark Analog Output 6 Remark Analog Output 7 Remark Analog Output 8 Remark Analog Output 9 Remark Analog Output 10 Remark Analog Output 11 Remark Analog Output 12 Remark NOTE The number of Analog Outputs can be up to 18 outputs This number of analog outputs can be achieved by using SV modules along with regular I O Modules E Womni 2 19 Chapter 2 2 20 Flow Computer Configuration 2 5 10 Front Panel Counter Settings Enter Y at Front Pnl Counters of the Misc Setup menu to open the following password Level 1 L1 entries Counter A Counter B Counter C Assign Front Panel Counter Enter the database index number of the accumulator variable that will be output to this electromechanical counte
73. cal buffers last 8 and archive if archive is setup L1 Disable Detail Report Enter Y to disable the Detail Report default is N This simply blocks the report from printing Data will still be sent to the historical buffers last 8 and archive if archive is setup L1 Daylight Savings Time Start Enter the Day Month Year that daylight savings time begins Users requesting not to use Daylight Savings Time must enter 00 00 00 via the front panel only L1 Daylight Savings Time End Enter the Day Month Year that daylight savings time ends Users requesting not to use Daylight Savings Time must enter 00 00 00 via the front panel only L1 Clear Daily Totals at Batch End Enter N to provide 24 hour totals of all flow through the flowmeter regardless of what product is run Select Y to clear the totalizers at the end of each batch This would mean that the daily totalizers would not necessarily represent 24 hours of flow but the amount of flow since the last batch end or the daily report Womni 2 41 Chapter 2 2 42 Flow Computer Configuration L1 Automatic Hourly Batch Select Enter Y to automatically cause a batch end every hour on the hour If customized reports are selected a batch end report will be printed If default reports are selected no batch end report will be printed L1 Automatic Weekly Batch Select Enter a number 1 through 7 to automatically print a batch end report in add
74. cecseseeeeeeeeeeeeeeeeeeeseeeeeeeeeeenees xiv Overview of Firmware Revisions 23 27 sssunnnnnennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nenna 1 1 1 1 Number of Meter Runs Type of FlowmeterS ccccsseeeeeseeeeeeessseeeeeesseeneneeeees 1 1 1 2 Product Configuration ss sissssissniniinisnsainkasnaninununnininanna kannatan innuna nen naunan anaana nana 1 1 Ei 50 2327 0003 Rev B Omni i OMNI 6000 OMNI 3000 User Manual Contents of Volume 3 1 3 Configurable Sensors per Meter RUN ccssseeecesseeeeeeeseseeeeeeeeeeeeeenseeneneeeeeeeeeees 1 2 1 4 Temperature Pressure and Differential Pressure Transmitters 000 1 2 1 5 Densitometers isis inissicssesesencasenntenanaeenne senda sannieneireaneniieanieamncanesmenantincinceeiedennnnne 1 2 1 6 Gas Chromatographs nic ces acess veseiceseencsicsscisccniceczaccicaciventsvescinstencentecanclaabiieceasceecss 1 2 gee dE re EU E 1 2 1 8 Gas Products Information Stored Product seccsssseeeeeseeeeeeeeeeeeeeeeeseeeeees 1 2 1 9 Type of Gases Measured cccssseeccessseeceeeseseeeeeesseeeeeeeseneneeseeseneeeeenseenaeeeeeseeeaes 1 2 1 10 Totalizing and Batching sivvsniiinsscesisesiatsssisicacssuntnuascicannunnisdacnisenienadandnenienmaiaiaes 1 3 1 11 PID Control Functions eege 1 3 1 12 Master Meter Proving sssssssseesennnunnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn annman nnana 1 3 1 13 Time Weighted and Flow Weighted AverageS s
75. d No part of this manual may be used or reproduced in any form or stored in any database or retrieval system without prior written consent of OMNI Flow Computers Inc Sugar Land Texas USA Making copies of any part of this manual for any purpose other than your own personal use is a violation of United States copyright laws and international treaty provisions OMNI Flow Computers Inc in conformance with its policy of product development and improvement may make any necessary changes to this document without notice Warranty Licenses and Product Registration Product warranty and licenses for use of OMNI flow computer firmware and of OmniCom Configuration PC Software are included in the first pages of each Volume of this manual We require that you read this information before using your OMNI flow computer and the supplied software and documentation If you have not done so already please complete and return to us the product registration form included with your flow computer We need this information for warranty purposes to render you technical support and serve you in future upgrades Registered users will also receive important updates and information about their flow computer and metering system Copyright 1991 2009 by OMNI Flow Computers Inc All Rights Reserved EI Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation T Chapter 1 Overview of Firmware Revisions 23 27 Orifice Turbine C
76. d Transducers Enter the same I O point to share transducers between meter runs Correcting a Mistake Enter an I O point of 0 to cancel an incorrectly entered I O point then enter the correct number Assigning I O Point 99 This indicates that the associated variable will be available for display and be used in all calculations but will not be obtained via a live input The variable value is usually downloaded into the flow computer database via a communication port or via a user variable statement 010 Enter 1 2 3 or 4 at Config Meter n of the Misc Setup menu to open the following entries PL Select Device Type Select flow measurement device type from 0 Orifice DP 1 Turbine 2 Rosemount MV DP 3 Honeywell HV DP 4 Instromet Qsonic 5 V Cone Flowmeter 6 FMC MPU 1200 7 Equimeter AAT 8 Daniel Ultrasonic 9 Coriolis Meter 10 FlowSic 600 UFM Meter 1 Meter 2 Meter 3 Meter 4 PL Flowmeter I O Point This entry applies only when turbine meters are selected in the entry above Enter the number of the I O point used to input the flow signal for each meter run Flowmeter pulse inputs can only be assigned to the 3 input channel of A B and E combo modules and 4 input channel of A and E combo modules Flowmeter Tag This entry applies only when turbine meters are selected in the entry above Enter the 8 character tag name used to identify this flowmeter on the LCD display
77. d by the OMNI flow computer are derived from the fundamental equation which expresses the characteristic function y known as the Helmholtz free energy in terms of the independent variables density p and temperature T This fundamental equation from which water density is derived has been obtained from Joseph H Keenan Frederick G Keyes et al Steam Tables Thermodynamic Properties of Water Including Vapor Liquid and Solid Phases John Wiley amp Sons 1969 page 134 5 4 4 NBS Density Viscosity Isentropic Exponent Sound Velocity and Enthalpy The NBS Technical Note 1048 Issued July 1982 is used to calculate density PC absolute viscosity isentropic exponent sound velocity and enthalpy for the following gases Argon Nitrogen Oxygen Hydrogen Ethylene Ei 5 16 Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation 5 4 5 Density and Relative Density Specific Gravity Calculated from Digital Densitometer and Gravitometer Output Frequency Density and Specific Gravity Values Determined from Densitometer and Gravitometer Frequency Signals The equations used to determine the density and specific gravity via gas density and specific gravity transducers are provided by the respective manufacturers The calculations expressed in this section are performed by the OMNI to determine the density from frequency signals received from the following third party densi
78. dition Fpv B D D n 3 ef 1 0 00132 T Where m 0 0330378 7 0 0221323 T 0 0161353 T n 0 265827 TY 0 0457697 T 0 133185 T m Pag 14 7 1000 T tag 460 500 Pag P Fp Tag t 460 Fz 460 P gauge pressure psig Fp 156 47 160 8 7 22 G Kp Where Kp Mc 0 392 Mn G Specific Gravity of flowing gas Mc mol percent carbon dioxide Mn mol percent nitrogen T flowing temperature F F 226 29 99 15 211 9 G K Where K Mc 1 681 Mn D b b e Ve Dm 50 2327 0003 Rev B YY Omni 5 21 Chapter 5 Flow Equations and Algorithms for S I Metric Units Revision 2774 75 The following equations used for developing E values based on the respective ranges of applicability for pressure and temperature E 1 0 00075 7 e T709 0 0011 T 1 09 7 2 17 1 4 T 1 09 Ae Pressure Range 7 0 to 2 or P 0 to 2000 psia Temperature Range T 1 09 to 1 4 or t 85 F to 240 F E 1 0 00075 Ad CH 67 D 1 317 1 09 T m 1 69 m Pressure Range 7 0 to 1 3 or P O to 1300 psia Temperature Range T 0 84 to 1 09 or t 40 F to 85 F E 1 0 00075 2 e2 T 0 455 200 1 09 T 0 03249 1 09 T 2 0167 1 09 T 18 028 1 09 T 42 844 1 09 T m 1 3 1 69 2 1 m Pressure Range 7 1 3 to 2 0
79. dquarters OMNI Flow Computers Inc 12620 West Airport Suite 100 Sugar Land Texas 77478 USA i D lt G3 Phone 281 240 6161 EI Fax 281 240 6162 World wide Web Site http www omniflow com E mail Addresses A a OMA helpdesk omniflow com Getting User Support Technical and sales support is available world wide through our corporate or authorized representative offices If you require user Support please contact the location nearest you see insert or our corporate offices Our staff and representatives will enthusiastically work with you to ensure the sound operation of your flow computer Omni ix OMNI 6000 OMNI 3000 User Manual For Your Information About the Flow Computer Applications OMNI 6000 and OMNI 3000 Flow Computers are integral into the majority of liquid and gas flow measurement and control systems The current firmware revisions of OMNI 6000 OMNI 3000 Flow Computers are e 23 27 Orifice Turbine Gas Flow Metering Systems US metric units About the User Manual This manual applies to 23 27 firmware revisions of OMNI 6000 and OMNI 3000 Flow Computers It is structured into 5 volumes and is the principal part of your flow computer documentation Target Audience As a users reference guide this manual is intended for a sophisticated audience with knowledge of liquid and gas flow measurement technology Different user levels of technical know how are considered in this manual You need n
80. dvanced Operation 2 15 Configuring the Meter Station be in the Program Mode In the Display Mode press the Prog key The Program LED will glow green and Select Group Entry screen will appear Then press Meter Enter and use b i keys to scroll Q Meter Station Setup via the Random Access Method Setup entries require that you Boolean flags which are set or reset depending on the station flow rate Run Switching Flag 1 at Modbus database point 1824 Run Switching Flag 2 at Modbus database point 1825 Run Switching Flag 3 at Modbus database point 1826 Each of these flags has a low threshold and high threshold flow rate Each flag is set when the station flow rate exceeds the corresponding high threshold value These flags reset when the station flow rate falls below the respective low threshold limit See Chapter 3 for more information on how to include these flags in Boolean statements to automatically switch meter runs depending on flow rates Q Meter Station Run Switching Flow Rate Thresholds The OMNI flow computer has 3 2 15 1 Accessing the Station Setup Submenu Applying the Menu Selection Method in the Select Group Entry screen Program Mode press Setup Enter and a menu similar to the following will be displayed SETUP MENU Pressure Setup DP Inches of Water Station Setup Use the L t up down arrow keys to move the cursor to Station Setup and press Enter to access t
81. e mass and energy flow are the same as is displayed on the LCD 0000 Assigning as Control Output Any internal alarm or Boolean can be output A EI Womni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Digital UO Point Settings continued Configuration and Advanced Operation Enter 1 through 24 for the selected digital I O Point at Config Digital n of the Misc Setup menu to open the following password Level 1 L1 entries Digital UO 1 Remark Digital UO 2 Remark Digital UO 3 Remark Digital UO 4 Remark Digital UO 5 Remark Digital UO 6 Remark Digital UO 7 Remark Digital UO 8 Remark Digital UO 9 Remark Digital UO 10 Remark Digital UO 11 Remark Digital UO 12 Remark Assign Pulse Width Pulse Unit or Delay On Delay Off 2 29 Chapter 2 2 30 Digital I O Point Settings continued Pulse Width Assign Digital UO 13 Remark Digital UO 14 Remark Digital I O 15 Remark Digital O 16 Remark Digital UO 17 Remark Digital UO 18 Remark Digital UO 19 Remark Digital UO 20 Remark Digital UO 21 Remark Digital UO 22 Remark Digital I O 23 Remark Digital UO 24 Remark Pulse Unit Flow Computer Configuration or Delay OnDelay Off 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation 2 5 15 Serial Input Output Settings Baud Rates Available 300 600 1
82. e in the Level 1 totalizer Flow occurring between the Level 2 and the Level 3 threshold will accumulate in the Level 2 totalizer Flow occurring above the Level 3 threshold will accumulated in the Level 3 totalizer The Special Billing threshold acts just like a fourth premium level when it is set to be greater in value than the Level 3 threshold but overrides any other premium threshold that is set greater than the Special Billing threshold Premium totalizers are stored for each meter run and the station for the last 10 days see database points 6n01 6n61 in Chapter 2 of Volume 4 For the following settings enter the premium billing flow threshold levels in thousand standard cubic feet MSCF hour Station Meter 1 Meter 2 Meter 3 Meter 4 Premium Level 1 Premium Level 2 Premium Level 3 Special Billing Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation 2 10 Configuring PID Control Outputs 50 2327 0003 Rev B you be in the Program Mode In the Display Mode press the Prog key The Program LED will glow green and the Select Group Entry screen will appear Then press Control n Enter n PID Control Loop 1 2 3 or 4 Use N W keys to scroll Q PID Control Output Setup via the Random Access Method Setup entries require that 2 10 1 Accessing the PID Control Setup Submenu Applying the Menu Selection Method in the Select Group Entry screen Prog
83. e override value is substituted l Womni 2 61 Chapter 2 2 62 Flow Computer Configuration L2 Override Code Enter the Override Code strategy 0 Never use override code 1 Always use override code 2 Use override code on transmitter failure 3 On transmitter failures use last hour s average L1 at 4mA Enter the value in engineering units that produces a transmitter output of 4mA or 1vol or LRV of Honeywell Smart Transmitters t L1 at 20mA Enter the value in engineering units that produces a transmitter output of 20mA or 5 Volts or URV of Honeywell Smart Transmitters Specific Gravity of Reference Gas X This entry applies only if Solartron 3098 gravitometer is selected as the reference specific gravity transducer type Enter the reference specific gravity of Reference Gas X or Y Sample gases X and Y are used to determine the calibration constants Ko and Ke for the Solartron 3098 specific gravity transducer L1 Damping Code This entry only applies to Honeywell digital transmitters connected to an H Type combo module The process variable e temperature pressure is filtered by the transmitter before being sent to the flow computer The time constant used depends on this entry For Pressure Transmitters enter the selected Damping Code 0 0 seconds 5 2 seconds 1 0 16 seconds 6 4seconds 2 0 32 seconds 7 8 seconds 3 0 48 seconds 8 16 seconds 4 1 seconds
84. e upstream tapping from the upstream orifice plate face D pipe diameter L o relative downstream pressure tapping spacing Ta Where Pa distance of the downstream tapping from the downstream orifice plate face D pipe diameter Ei a Omni 5 5 Chapter 5 Flow Equations and Algorithms for S I Metric Units Revision 2774 75 FOR CORNER TAPPINGS Ly Lo 0 For D AND D 2 TAPPINGS Ly 1 Lo 0 47 FOR FLANGE TAPPINGS WE 1 Lo D Coefficient of Discharge for ISA 1932 Nozzles C IN D 6 1 15 C IN 0 99 0 2262 8 0 00175 B 0 0033 B Where C IN discharge coefficient for ISA 1932 nozzle B diameter beta ratio see 5 1 6 this chapter Rp pipe Reynolds number see 5 1 6 this chapter Coefficient of Discharge for Long Radius Nozzles C LN 6 0 5 C LN 0 9965 0 00653 81 Ei D Where C LN discharge coefficient for long radius nozzle B diameter beta ratio see 5 1 6 this chapter Rp pipe Reynolds number see 5 1 6 this chapter Coefficient of Discharge for Classical Venturi Tubes Venturi Tube with an Rough Cast Fabricated Convergent Section C VT R F C VTR F 0 984 When 100mm lt D lt 800mm 0 3 lt B lt 0 75 5 6 2x10 lt Rp lt 2x10 5 6 Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Where C VTR F H Rp Configuration and Advanced Operation discharge coefficient for classical Venturi tube with an
85. ed Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation L2 Override Code Enter the Override Code strategy 0 Never use override code 1 Always use override code 2 Use override code on transmitter failure 3 On transmitter failures use last hour s average L1 Value at 4mA Enter the engineering units that the transducer outputs at 4mA or 1volt This entry does not apply for reference specific gravity when Solartron 3098 gravitometer is selected as the reference SG transducer type L1 Value at 20mA Enter the engineering units that the transducer outputs at 20mA or 5volt This entry does not apply for reference specific gravity when Solartron 3098 gravitometer is selected as the reference SG transducer type L1 NX19 Analysis Selecting NX19 Analysis will require the user to enter the GC components Mole for Nitrogen N2 and Carbon Dioxide CO2 Setup entries require that you be in the Program Mode In the Display Mode press the Prog key The Program LED will glow green and Select Group Entry screen will appear Then press Analysis Input Enter or Analysis Input n Enter n Auxiliary Input 1 2 3 or 4 Use N V keys to scroll Q Gas Analysis Variable amp Auxiliary Input Setup via the Random Access Method Q NOTE Not Valid when a RTD Probe is specified Time Reference of Gas X This entry applies only if Sol
86. ed between the upstream and downstream tap holes or in the throat of a Venturi tube pf fluid density at flowing conditions actual temperature and pressure in kilograms per cubic meter kg m pb fluid density at base conditions standard reference temperature and pressure in kilograms per cubic meter kom HV volumetric heating value at reference conditions in MM 5 2 YY Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation 5 1 6 Diameters and Diameter Correlations The various flow equations require calculating the diameters of the orifice plate bore or nozzle Venturi throat the meter tube or pipe internally and the diameter beta ratio These calculated diameters are also used to calculate the pipe Reynolds number which is used in calculating discharge coefficients Orifice Plate Bore or Nozzle Venturi Throat Diameter d mm The calculated diameter in millimeters of the orifice plate bore or of the throat of the nozzle or Venturi tube at flowing temperature is used in the flow equations to calculate flow rates and the orifice Reynolds number It is the internal diameter of the orifice plate measuring aperture bore or the throat of the nozzle or the Venturi tube computed at flowing temperature It is defined as follows d d l a T T Where d orifice plate bore or nozzle Venturi throat diameter at flowing temperature in mm dr
87. eeeneeeseaeeesaaeeeeaeeeeaees 2 49 Configuring Meter Temperature sc eccssseeeeeeesseeeeeesseneeeeeesseeeeeesseneeeenseseeees 2 52 2 12 1 Accessing the Temperature Setup Gubmen 2 52 2 12 2 Station and Meter Run Temperature Geitings 2 52 2 12 3 Station and Meter Run Density Temperature Geitigs eerren 2 53 Configuring Meter PreSSure ssscesssersseseessserssecseensersnenseensnerseceseesneneseensennne 2 54 2 13 1 Accessing the Pressure Setup Submenu ssessesssesssessissrtsrtsrrtrnntrnrnrnnssnnnsennne 2 54 2 13 2 Station and Meter Run Pressure Settings eeeseeeseeseesseeseeeeseeeererensrresrresrrenrne 2 54 2 13 3 Station and Meter Run Density Pressure Settings c cceeceeesceeseteeeeseeeeneeeeees 2 55 Configuring Differential PreSSUure ccccssseeeeessseeeeeeeeeeeeeeeensseneeeneseneeeeeeseeees 2 57 2 14 1 Accessing the Differential Pressure Setup Submenu cceeceeeeeeeetteeeeeeteees 2 57 2 14 2 Station and Meter Differential Pressure Settings cccccseeeeeseeeeeeeeeeeeeeeeeeeees 2 57 Configuring the Meter Station ccsssesscssessseessesseessnersseoeensensnenseenssenssennennse 2 59 2 15 1 Accessing the Station Setup Guten 2 59 2 15 2 Meter Station Settings 0 cecccccceececeeeeeneeeeeeeeeaeeeeaeeeeeaeeesaaeeeeaaeseeeeeseaeeesaeeseaeessaees 2 59 Configuring Meter RUNS siciscasinccsisiaaiseencssenieaintesarnsaieaiancanessaninaricenatiewannsantanteditans 2 63 2
88. ees Celsius we subtract 32 from the degrees Fahrenheit variable 7105 and divide the result 7027 by 1 8 Example 4 Gross barrels within the flow computer are simply flow meter counts divided by the flow meter K Factor pulses per barrel i e gross barrels are not meter factored To provide a variable 7029 which represents Meter Run 1 gross meter factored barrels multiply the batch gross barrel totalizer 5101 by the batch flow weighted average meter factor 5114 bbls hr x 24 bbls day PROG VARIABLE 70xx 7101 24 7101 7_ 7105 32 7027 1 8 5101 5114 3 3 2 Using Boolean Variables in Variable Statements Boolean points used in a programmable variable statement are assigned the value 1 0 when the Boolean value is TRUE and 0 0 when the Boolean value is FALSE By multiplying by a Boolean the user can set a variable to 0 0 when the Boolean point has a value FALSE Example Provide a variable 7025 which functions as a Report Number The report number which will appear on each batch end report must increment automatically after each batch and reset to zero at the contract day start hour on January 1 of each year ees PROG VARIABLE 70xx Clear batch rt 25 702541835 ear batch repo s number on Jan 1 26 1834 7025 0 Contract Hour 27 Boolean 1835 is true one calculation cycle at the end of a batch Boolean point 1834 is equal to 1 0 for one calculation cycle on the contract day
89. en will appear Then press Print Setup Enter and use 1 VW keys to scroll Q Printer Setup via the Random Access Method Setup entries require that you be in the 2 7 1 Accessing the Printer Setup Submenu Applying the Menu Selection Method in the Select Group Entry screen Program Mode press Setup Enter and a menu similar to the following will be displayed SETUP MENU Misc Configuration Time Date Setup Printer Setup Use the IMN up down arrow keys to move the cursor to Printer Setup and press Enter to access the submenu 2 7 2 Printer Settings L1 Computer ID Appears on all reports Enter up to 8 alphanumeric characters to identify the flow computer L1 Print Interval in Minutes Enter the number of minutes between each interval report Entering 0 will disable interval reports The maximum allowed is 1440 minutes which will provide one interval report per 24 hour period L1 Print Interval Start Time Enter the start time from which the interval report timer is based e g Entering 01 00 with a Print Interval of 120 minutes will provide an interval report every odd hour only L1 Daily Report Time Enter the hour at which the daily report will print at the beginning of the contract day e g 07 00 L1 Disable Daily Report Enter Y to disable the Daily Report default is N This simply blocks the report from printing Data will still be sent to the histori
90. entry usually appears on the prove report Meter Size Enter the size of the flowmeter up to 8 alphanumeric characters This entry usually appears on the prove report Serial Number Enter the serial number of the flowmeter up to 8 alphanumeric characters This entry usually appears on the prove report Transducer Density Select Enter Y if you have a densitometer transducer measuring flowing density on this metering run and you wish to use this density value to calculate mass and volume flow rate Enter N to cause the flow computer to use the appropriate equation of state Additional Entries when Orifice Meter Type Selected The following entries apply when an orifice meter is selected in the Config Meter n submenu of the Misc Configuration menu Unless otherwise indicated the password level for these settings is L1 Low Flow Cutoff Differential pressure signals lower than the value entered here will not be totalized Differential pressure is expressed as inches of water for U S units applications and kPa or mBar for metric units applications Orifice Venturi Throat Diameter Enter the diameter inches or mm of the orifice bore at the orifice plate reference temperature The actual diameter of the orifice bore is calculated continuously based on the flowing temperature of the fluid Orifice Venturi Ref Temperature Enter the temperature F for US units or C for metric units that corr
91. er Report Templates Using OmniCom the user can generate custom report templates or edit existing templates These are uploaded into the flow computer Custom templates for the snapshot batch end daily and prove reports can be defined Serial Communication Links Up to six serial data links are available for communications with other devices such as printers SCADA systems PLC s and other OMNI Flow Computers Ports communicate using a superset of the Modbus protocol ASCII or RTU Printer data is ASCII data Ethernet communications are also available Up to two modules per system can be used Peer to Peer Communications OMNI flow computers can be user configured to communicate with each other as equal peers Groups of data variables can be exchanged or broadcast between other flow computers Multiple flow computers can share resources such as a PLC Archive Data Two types of data archiving are possible in the flow computer 1 Formatted ASCII text using custom report templates 2 Raw Data using archive records and files E Omni 50 2327 0003 Rev B Volume 3 1 23 1 24 1 25 1 26 1 27 50 2327 0003 Rev B Configuration and Advanced Operation OmniCom Windows Version Software Communications Package OmniCom Windows version software is provided with each flow computer and allows the user to configure the computer on line or off line using a personal computer OmniView Window Version Soft
92. er tag name used to identify the display variable on the LCD display 1 Variable Index Number Enter the database index number of the variable that you want to appear on the LCD display Each variable within the flow computer database is assigned an index number or address Any Boolean integer or floating point variable within the database can be displayed 17 Variable Decimal Point Position Enter the number of digits to the right of the decimal point for the variable Valid entries are 0 through 7 The computer will display each variable using the display resolution that you have selected except in cases where the number is too large or too small In either case the flow computer will adjust the decimal position or default to scientific display mode Tag Index Decimal Points 2 Variable 3 Variable 4 Variable User Display 2 Key Press Sequence C WW Bi Tag Index Decimal Points 1 Variable 2 Variable 3 Variable 4 Variable User Display 3 Key Press Sequence C Tag Index Decimal Points 1 Variable 2 Variable 3 Variable 4 variable Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation User Display 4 Key Press Sequence Tag 1 Variable 2 Variable 3 Variable 4 variable User Display 5 Key Press Sequence Tag 1 Variable 2 Variable 3 Variable 4 Variable User Display 6 Key Press Sequence Tag 1 Variable 2
93. eration To program the user variables proceed as follows From the Display Mode press Prog Setup Enter Enter and the following menu will be displayed Misc Setup Password Maint Y Check Modules Y Config Station Y Config Meter n Config PID n Config D A Out n Front Pnl Counters Program Booleans Program Variables Scroll down to Program Variables DI and enter Y Assuming that no variables are as yet programmed the display shows PROG VARIABLE 70xx Note that the cursor is on the line labeled 25 At this point enter the variable equation that will calculate the value of variable 7025 Example 1 To provide a variable 7025 which represents Meter Run 1 gross flow rate in MCF per day in place of the usual MCF per hour multiply the MCF per hour variable 7101 by the constant 24 bbls hr x 24 bbls day PROG VARIABLE 70xx i bbls hr x 0 7 gal min Example 2 To provide a variable that represents gallons per minute 7026 we can convert the barrels per hour variable 7101 to gallons by multiplying by 0 7 0 7 42 60 which is the number of gallons in a barrel divided by the number of minutes in an hour bbls hr x 24 bbls day bel PROG VARIABLE 70xx 25 7101 24 26 27 D Womni 3 11 Chapter 3 User Programmable Functions 3 12 Example 3 To provide a variable 7028 that represents meter run 1 temperature in degr
94. ering devices except for pipe tapped orifice flowmeters 48 R Gin az uD Where Rp pipe Reynolds number referenced to the upstream internal meter tube diameter or upstream diameter of a classical Venturi tube qm mass flow rate at flowing actual conditions for differential pressure flowmeters in lbm sec m universal constant 3 14159 u absolute dynamic viscosity of fluid at flowing conditions in lom ft sec D upstream internal meter tube diameter or upstream diameter of a classical Venturi tube at flowing temperature in inches 4 4 Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation Pipe Reynolds Number Referenced to the Bore or Throat Diameter Rq The following equation applies only to pipe tapped orifice meters _ 48q mud m R Where Hu pipe Reynolds number referenced to the orifice plate bore or nozzle Venturi throat diameter qm mass flow rate at flowing actual conditions for differential pressure flowmeters lbm sec m universal constant 3 14159 u absolute dynamic viscosity of fluid at flowing conditions in lom ft sec d orifice plate bore or nozzle Venturi throat diameter at flowing temperature in inches 4 1 7 Velocity of Approach Factor Ey Q Dimensionless Values The calculated velocity of approach factor is dimensionless however consistent units must be used The velocity of approach factor is
95. esponds to the temperature of the orifice plate when the bore was measured Orifice Venturi Expansion Coef Enter the expansion coefficient for the type of material of the orifice plate see table below The orifice bore diameter will expand and contract depending upon the temperature and thermal expansion coefficient for the type of plate material The orifice equations require the linear coefficient of expansion US Customary Units Metric Units Monet 710 154 7 95xe 21 6 t067 8 C 1 43 x0 Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation Meter 1 Meter 2 Meter 3 Meter 4 Pipe Measured Diameter Enter the diameter of the meter tube pipe inches or mm at the reference temperature The actual diameter of the meter tube used in the equations is calculated continuously based on the flowing temperature of the fluid Pipe Reference Temperature Enter the temperature F for US units or C for metric units that corresponds to the temperature of the metering tube when the orifice diameter was measured Pipe Expansion Coefficient Enter the expansion coefficient for the type of material of the pipe The meter tube diameter will expand and contract depending upon the temperature and thermal expansion coefficient for the type of pipe material The orifice equations require the linear coefficient of expansion US Customary Units Metric Units Monel 7t0154 F 7 95xe 21
96. ess than this value before the flow rate is considered to be stable enough to start a prove L2 Prover to Meter Temperature Deviation Range Enter the prover to meter temperature range C or F allowable after the temperature and flow rate have stabilized The temperature at the meter and the prover must be within this limit or the prove sequence attempt will be aborted L2 Run Repeatability Maximum Deviation Enter the maximum allowable percentage deviation between run counts or run meter factors depending on selection of previous entry The deviation is calculated by comparing the high low meter counts or meter factors based on their low point as follows Deviation 100 High Low Low Point This deviation is always calculated using the meter factor when the Master Meter Method of proving is selected L2 Meter Factor Deviation Percent The prove meter factor just calculated is compared against the current meter factor and must be within this percentage range to be accepted as a valid meter factor L2 Automatic Meter Factor Implementation Enter Y to automatically implement the new meter factor and store in the appropriate product file Enter N to select not to automatically implement the meter factor determined from the prove L2 Archive All Prove Reports Y N Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation ee Chapter 3 User Programmable Functions 3 1
97. etin 52 0000 0002 TB 960703 Storing Archive Data within the Flow Computer in Volume 5 for information on the Archive File n submenu Setting Up the Time and Date 2 6 Setting Up The Time and Date 2 6 1 Accessing the Time Date Setup Submenu Applying the Menu Selection Method in the Select Group Entry screen Program Mode press Setup Enter and a menu similar to the following will be displayed SETUP MENU Misc Configuration Time Date Setup Printer Setup Use the THAI up down arrow keys to move the cursor to Time Date Setup and press Enter to access the submenu 2 6 2 Time and Date Settings L1 OMNI Time Enter Current Time using the correct method hh mm ss To change only the hour minutes or seconds move cursor to the respective position and enter the new setting L1 OMNI Date Enter Current Date using the correct method mm dd yy or dd mm yy To change only the month day or year move cursor to the respective position and enter the new setting L1 Select Date Format Type Select date format required by entering Y or N Y month day year N day month year SC DI 2 40 Womni 50 2327 0003 Rev B Volume 3 2 7 50 2327 0003 Rev B Configuration and Advanced Operation Configuring Printers Program Mode In the Display Mode press the Prog key The Program LED will glow green and the Select Group Entry scre
98. evices by means of incompressible fluids liquids shows that the discharge coefficient is dependent only on the pipe Reynolds number Rp for a given primary device in a given installation The numerical value of the coefficient of discharge C is the same for different installation whenever such installations are geometrically similar and the flows are characterized by identical pipe Reynolds numbers ISO 5167 1 1991 page 3 Al NOTE For pipelines with D lt 58 62mm and L gt 0 4333 use 0 039 STITT in the discharge coefficient equation for orifice plates Y Dimensionless Values The discharge coefficient is dimensionless however consistent units must be used The equations for the coefficient of discharge C have been determined from test data and correlated as a function of the diameter ratio B the pipe diameter D and the pipe Reynolds number Rp It is used in the flow rate equations and is defined by the following equations Coefficient of Discharge for Orifice Plates C OP The discharge coefficient for orifice plates is given by the Stolz equation 0 75 10 C OP 0 5959 0 0312 B 0 184 B 0 0029 8 D 0 09L B 1 B 0 0337 L 8 Where C OP discharge coefficient for orifice plate B diameter beta ratio see 5 1 6 this chapter Rp pipe Reynolds number see 5 1 6 this chapter L4 relative upstream pressure tapping spacing 14 D Where lh distance of th
99. figuration and Advanced Operation 2 5 16 Custom Modbus Data Packet Settings INFO Packets defined are usually read only and must always be retrieved as a packet When Modicon 984 is selected these packet setup entries are used to define a logical array of variables which can be read or written in any grouping The number of data points is always input in terms of OMNI logical elements i e an IEEE floating point number comprises two 16 bit words but is considered one logical element Custom Modbus Data Packets are provided to reduce the number of polls needed to read multiple variables which may be in different areas of the database Groups of data points of any type of data can be concatenated into one packet by entering each data group starting index numbers 001 201 and 401 The number of data bytes in a custom packet in non Modicon compatible mode cannot exceed 250 RTU mode or 500 ASCII mode When Modicon compatible is selected the number of data bytes in a custom packet cannot exceed 400 RTU mode or 800 ASCII mode Enter 1 2 or 3 to select a data packet at Custom Packet n of the Misc Setup menu to open the entries below Under Index enter the database address or Modbus index number for each start data point of each group Under Points enter the number of consecutive data points to include in each data group Custom Modbus Data Packet 1 Addressed at 001 L1 Index Points Inde
100. g 1 AND Flag 2 AND NOT Flag3 Zone 4 Flag 1 AND Flag 2 AND Flag 3 Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation As each statement can have only 3 terms in it we must pre process some part of the equations The term NOT Flag 2 AND NOT Flag 3 appears in Zone 1 and 2 equations Now we assign valid point numbers to our statements and rewrite them the way they will be input First one term needs to be pre processed to simplify 1025 NOT Flag 2 AND NOT Flag 3 25 18258 amp 1826 Next the flow Zones are defined Zone 1 NOT Flag 1 AND NOT Flag 2 AND NOT Flag 3 26 18248 amp 1025 Zone 2 Flag 1 AND NOT Flag 2 AND NOT Flag 3 27 182481025 Zone 3 Flag 1 AND Flag 2 AND NOT Flag 3 28 1824 amp 18258 1826 Zone 4 Flag 1 AND Flag 2 AND Flag 3 29 1824 amp 1825 amp 1826 The program thus far looks like Flag 2 amp Flag 3 BOOLEAN POINT 10xx 1105 1002 1205 1003 1719 10254 1026 1824 amp 18258 amp 1826 1824 amp 1825 amp 1826 In our example each meter run valve V1 V2 V3 and V4 fails closed energizes to open A limit switch mounted on each valve indicates the fully open position SW1 SW2 SW3 and SW4 SW 1 2 5 amp 4 1011 INDICATE THAT sw VALVE IS FULLY OPEN OP 1 2 3 amp 4 ARE VALVE FLOW ENERGISE SIGNALS 1013 SW3 NUMBERS IN PARENTHESES ARE PHYSICAL 1 0 ASSIGNMENT NUMBERS Figure 3 2 Figure Showing Four Me
101. gas at flowing conditions kg m3 calculated using AGA 8 or measured by a suitable gas densitometer Note AGA 11 states that it is not permissible to use the density measured by the Coriolis meter DENb Density of the gas at base conditions kg m3 calculated using AGA 8 ISO6976 or by RD x DENair RD Relative density of the gas at base conditions obtained from either a manual input or a gas chromatograph DENair Density of air at base conditions kg m3 HV Volumetric heating value at base conditions MJ m3 calculated using ISO 6976 AGA 5 GPA 2172 or obtained from a gas chromatograph or manual input Omni 5 11 Chapter 5 Flow Equations and Algorithms for S I Metric Units Revision 2774 75 5 4 Densities and Other Properties of Gas 5 4 1 AGA Report N 8 Compressibility for Natural Gas and Other Related Hydrocarbon Gases Gi AGA Report N 8 Documentation References Detailed information on computations performed in conformance to the different editions of this standard can be found in the following AGA Report N 8 versions Second Edition July 1994 2 Printing Catalog N XQ9212 Second Edition November 1992 Catalog MI XQ9212 December 1985 Catalog N XQ1285 OMNI flow computer firmware has been programmed in conformance with the December 1985 November 1992 and July 1994 editions of the American Gas Association Report N 8 AGA 8 This standard provides computation methodology for compressi
102. he submenu 2 15 2 Meter Station Settings L1 Station ID Enter 8 alphanumeric characters maximum This string variable usually appears in user custom reports Modbus database point 4815 High Low Limits Units Selection 0 Mass 1 Net Select the units for the high and low alarm limit The choices are Mass or Net Volume Available with firmware 27 75 01 and up Flow Low Alarm Limit Enter the flow rate below which the Station Low Flow Alarm activates Modbus database point 1810 Flow rates 5 below this value activate the Low Low Alarm Modbus database point 1809 Flow High Alarm Limit Enter the flow rate above which the Station High Flow Alarm activates Modbus database point 1811 Flow rates 5 above this value activate the High High Alarm Modbus database point 1812 L1 Gross Flowrate Full Scale Enter the gross flow rate at full scale for the meter station Sixteen bit integer variables representing station gross and net flow rate are included in the database at 3802 and 3804 These variables are scaled using this entry and stored as percentage of full scale with a resolution of 0 1 e 0 to 999 0 to 99 9 l a Omni 2 59 Chapter 2 2 60 Flow Computer Configuration L1 Mass Flowrate Full Scale Enter the mass flow rate at full scale for the meter station A 16 bit integer variable representing station mass flow rate is included in the database at 3806 This variable is scaled using this entry and s
103. hen the accumulated error counts exceed this number For the delay cycle enter 0 20 as the number of 500ms cycle delays differentiate between simultaneous noise with A 0 and a A failure PL Activated Detailed Daily Report Enter Y to activate a Detailed Daily Report within the Flow Computer Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation PL Reset All Totalizers Y N Entering Y will reset all current meter totalizers to 0 0 Once this has been done the user will see another display All Totalizers now reset and the user can now select the totalizers resolution of digits 0 9 1 8 Next the user can select the decimal place resolution for the front panel by selecting the number of decimal places required for Gross Net and Mass The three electromechanical totalizers on the front of the computer cannot be zeroed PL Reset All RAM Y N Resetting all RAM will clear all configuration data calibration data and totalizers This means that all configuration data will have to be re entered PL Input Calibrate Default Entering a Y here will set all the analog input calibration constants used to scale zero and span settings to the default value This will require you to re calibrate all the inputs You can also do this on a channel by channel basis by entering the input channel number PL D A Calibrate Default Entering a Y here will set all the analog outpu
104. ic characters for each meter run This ID usually appears on reports Product Analysis Selected Enter the product number for the analysis data to be used for each meter run The flow computer is capable of processing up to four meter streams each with independent fluids and or analysis data Product and analysis data can be common to any number of metering runs Valid product numbers are 1 4 High Low Limits Unit Selection 0 Mass 1 Net Select the units for the high and low alarm limits The choices are Mass or Net Volume Available with firmware 27 75 01 and up Flow Low Limit Enter the flow rate for each meter run below which the Flow Low Alarm database point 1n21 activates Flow rates 5 below this value will activate the Low Low Alarm Modbus database point 1809 Flow High Limit Enter the flow rate for each meter run above which the Flow High Alarm database point 1n22 activates Flow rates 5 below this value will activate the High High Alarm Modbus database point 1812 l a Omni 2 63 Chapter 2 2 64 Flow Computer Configuration Meter 1 Meter 2 Meter 3 Meter 4 Gross Flow at Full Scale Enter the gross flow rate at full scale for each meter run Sixteen bit integer variables representing meter run gross and net flow rate are included in the database at 3n42 and 3n40 respectively These variables are scaled using this entry and stored as percentage of full scale with a resolution of 0 1 i e 0 to
105. ified by placing a symbol ahead of the number These and other operators are Operator Symbol Operator Symbol Operator Symbol ABSOLUTE ADD MOVE CONSTANT SUBTRACT COMPARE POWER amp EQUAL INDIRECT MULTIPLY j IF RISING EDGE DIVIDE GOTO G FALLING EDGE ONE SHOT RANGE lt CHECK Y The order of precedence is ABSOLUTE POWER MULTIPLY DIVIDE ADD SUBTRACT In cases where operators have the same precedence statements are evaluated left to right E g The value of floating point variable 7035 is defined as 7035 7027 amp 0 5 7026 The power operator is evaluated first the value of Point 7035 is set equal to the square root of the number contained in Point 7027 and the result is multiplied by the number stored in variable 7026 Note that statements can contain the results of other statements See OmniCom Help for more information by pressing F1 on your PC keyboard in the Configure Variable Statement menu Enter Y at Program Variables of the Misc Setup menu to open the following password Privileged Level PL entries Prog Variable 70xx Equation or Statement Comment or Remark 25 26 27 28 29 30 31 32 33 34 35 36 37 Ei a Omni 2 23 50 2327 0003 Rev B Chapter 2 Flow Computer Configuration Prog Variable 70xx Equation or Statement Comment or Remark 38 39 40 41 42 43 44 45 46 47 48 4
106. il low alarm High Alarm Limit E a Enter the pressure above which the densitometer high alarm activates Transducer values approximately 10 above this entry activate the transducer fail high alarm L2 Override Enter the pressure value that is substituted for the live transducer value depending on the override code An displayed along side of the value indicates that the override value is substituted L2 Override Code NN Enter the Override Code strategy 0 Never use override code Always use override code Use override code on transmitter failure On transmitter failures use last hour s average 1 2 3 50 2327 0003 Rev B Omni 2 55 Chapter 2 Flow Computer Configuration L1 at 4mA Enter the pressure engineering units that the transducer outputs at 4mA or 1volt or lower range limit LRV of Honeywell Smart Transmitters L1 at 20mA e Enter the pressure engineering units that the transducer outputs at 20mA or 5volts or upper range limit URV of Honeywell Smart Transmitters This entry only applies to Honeywell digital transmitters connected to an H Type combo module The process variable i e pressure is filtered by the transmitter before being sent to the flow computer The time constant used depends on this entry For Pressure Transmitters enter the selected Damping Code 0 0 seconds 5 2 seconds 1 0 16 seconds 6 4 seconds 2 0 32 seconds 7 8 seconds 3 0 48 seconds 8 16 seconds
107. ill be automatically shifted right to counter the overflow The computer will shift to scientific display mode if the integer part of the number exceeds 9 999 999 To configure the user display screens proceed as follows From the Display Mode press Prog Setup Enter Enter and the following menu will be displayed Misc Setup Password Maint Y Check Modules Y Config Station Y Config Meter n Config PID n Config D A Out n Front Pnl Counters Program Booleans Program Variables User Display n Scroll down to User Display n screen you wish to configure and enter 1 through 8 to specify which Ei 50 2327 0003 Rev B Womni 3 15 Chapter 3 User Programmable Functions The screen for Display 1 shows USER DISPLAY 1 Key Press Var 1 Tag Var 1 Index Var 1 Dec Var 2 Tag Var 2 Index Var 2 Dec Var 3 Tag Var 3 Index Var 3 Dec Var 4 Tag Var 4 Index Var 4 Dec Use the UP DOWN arrows to scroll through the screen For Key Press enter the key press sequence up to 4 keys that will be used to recall this display The keys are identified by the letters A through Z lt o O gt H o 3 2 rg D ke E E a ki Die w oJ z D m N T D Kl 9 Sr ke Temp Press Density a a A ounts Factor Preset Batch Analysis a 3 Q 3 16 Ge N K Gi
108. in Lb FT US units or Kg m metric units at standard temperature and pressure Add Neo C5 to Density Calculation Add Neo C5 to Heating Value Calculation Prod 1 Prod 2 Prod 3 Prod 4 L1 Flowing Fluid Viscosity Enter the absolute viscosity of the gas at flowing conditions in centipoise units For NIST 1048 products only enter 999 to have the flow computer calculate the viscosity using the equation of state L1 isentropic Exponent Enter the Isentropic Exponent dimensionless factor for this product at flowing conditions For NIST 1048 fluids only enter 999 to have the flow computer calculate it for you using the equation of state L1 Heating Value HV Enter a minus negative override value if you want the flow computer to calculated a heating value to calculate energy totals Heating value is calculated using AGA 5 GPA 2172 or ISO 6976 for natural gas NIST algorithms are used for steam and other gases HV is expressed in BTU SCF US units or MJ Nm3 metric units Enter a positive override value to be used in place of the calculated value in systems where a gas chromatograph GC is not available In systems which use a GC this override is also the fall back value should the GC fail The GC HV if available will always be used unless it is assigned the component number 0 in the Analysis Setup menu Energy can also be calculated using the live 4 20mA value obtained from a BTU analyzer In this case
109. ion Codes and Mole Percent Ranges AGA Report N 8 Editions Applicable to OMNI Flow Computers TYPE OF 1994 1992 Gas ID MoLE RANGE D MOLE wou Je Cove Rance Methane 45 0 to 100 0 0 to 100 0 50 0 to 100 0 Nitrogen 0 to 50 0 0 to 100 0 0 to 50 0 wo IW Carbon Dioxide 0 to 30 0 0 to 100 0 0 to 50 0 Ethane 0 to 10 0 0 to 100 0 0 to 20 0 N Se 4 7 8108 0 to 1 0 0 to 6 0 0 to 3 0 Total Butanes Total Butanes Butanes 0 to 2 0 Pentanes 0 to 0 3 0 to 4 0 0 to 1 0 Total Pentanes Total Pentanes Hexane Plus Heavier Hydrocarbons Water Vapor Hydrogen Sulfide Hydrogen Carbon Monoxide Oxygen so Butane Normal Butane so Pentane Normal Pentane Normal Hexane Normal Heptane Normal Octane Normal Nonane Normal Decane Helium Argon Nilo e 0 to 0 2 0 to Dew Point Hexane Plus Heavier Hexane Plus Heavie Hydrocarbons Hydrocarbons ol l WS EA 2 7 8 ER RER 2 5 ES ER Ea WE CS argon Mal e 4 16 Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation Methods for Gas Mixture Characterization AGA Report N 8 1994 1992 EDITIONS Three methods of characterization of a gas mixture from the AGA 8 1994 1992 editions are available for use on the OMNI Flow Computers the Detailed Method and the Gross Characterization Methods 1 amp 2 The Detailed Characterization Method The gas phase pressure temperature de
110. is allows software developers an easy means of debugging communications software Error checking should only be disabled temporarily when debugging the master slave communication link The computer expects dummy characters in place of the CRC LRC or BCC Enter Y to perform error checking on incoming messages For maximum data integrity always enter Y during normal running conditions Enter N to disable error checking on incoming messages This entry will be disabled for Serial Port 1 if a printer is selected as the port type L1 Ethernet Module SE 5 Computer Default Mode N If an Ethernet module is installed the following entries will display when this entry is set to Yes L1 Modbus ID L1 Modicon Compatible VIN Computer Default Mode N L1 IP Address All devices on a network require a unique IP address This is the IP address used for all network connections to the Modbus Mux The IP address is entered in dotted decimal notation L1 Netmask IP addresses contain a Network Identifier netid a Subnet Identifier subnetid and a Host Identifier hosted The mask IP address is entered in dotted decimal notation L1 Gateway If a default gateway exists for accessing other subnets it can be entered here The Gateway is entered in dotted decimal notation Allows computer Alarm reports to be printed thru the ethernet module Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Con
111. is always left open but may be closed via manual command Run Switch Threshold High Differential Pressure A meter run will be opened when the differential pressure across the orifice of the last run opened exceeds this percentage of its maximum range Meter runs are opened in order from lowest to highest skipping any meter runs which may not be in service Runs placed back in service will automatically be utilized when the flow computer wraps around e opens the highest numbered meter run and then starts looking for any runs that may have be out of service previously Gas Analysis Variables the following gas analysis variables Reference Specific Gravity Ref SG Nitrogen N2 Q Gas Analysis Variables Press Prog Meter Enter at the front keypad to access Carbon Dioxide CO2 Heating Value HV Q NOTE Not Valid when a RTD Probe is specified Bei SG N2 CO2 HV Low Alarm Limit Enter the gas analysis variable value to be used as the low alarm point The low alarm will activate when the input variable falls below this value High Alarm Limit Enter the gas analysis variable value to be used as the high alarm point The high alarm will activate when the input variable goes above this value L2 Override Value Enter the engineering value that is substituted for the live transducer value depending on the override code An displayed along side of the value indicates that the override value is substitut
112. is chapter Ra pipe Reynolds number referenced to the diameter of the orifice plate bore see 4 1 6 this chapter 4 8 Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation Coefficient of Discharge for ASME Flow Nozzles Cg FN Q Dimensionless Values The calculated coefficient of discharge is dimensionless however consistent units must be used 0 5 10 C FN 0 9975 0 00653 E R Where Ca FN coefficient of discharge at a specified pipe Reynolds number for ASME flow nozzles B diameter beta ratio see 4 1 6 this chapter Hau pipe Reynolds number referenced to the diameter of the orifice plate bore see 4 1 6 this chapter Coefficient of Discharge for Classical Venturi Tubes With Rough Cast Fabricated Convergent Section Cg VTR F Cq VTR F 0 984 When 4inches lt D lt 48 inches 0 3 lt B lt 0 75 5 6 2x10 lt Rp lt 6x10 Where Cq VTp F discharge coefficient for classical Venturi tube with a rough cast or fabricated convergent section B diameter beta ratio see 4 1 6 this chapter Rp pipe Reynolds number see 4 1 6 this chapter With Machined Convergent Section Ca VT m Cq VTm 0 995 When 2inches lt D lt 10 inches 0 3 lt lt 0 75 5 6 2x10 lt Rp lt 2x10 Where Cq VTm discharge coefficient for a classical Venturi tube with a machined convergent section B diameter beta ratio see 4 1 6 this chapter
113. isplay SG Transducer Type Enter the SG transducer type 1 4 20mA signal 2 Solartron 3098 digital pulse PL Nitrogen N3 I O Point Enter the physical UO point number used to input this gas analysis variable Points 1 24 The data from this input signal will be used in the AGA 8 equation of state Enter 0 if this signal is not available to the flow computer N Transducer Tag Enter the 8 character tag name used to identify this transducer on the LCD display PL Carbon Dioxide CO2 I O Point Enter the physical I O point number used to input this gas analysis variable Points 1 24 The data from this input signal will be used in the AGA 8 equation of state Enter 0 if this signal is not available to the flow computer CO Transducer Tag Enter the 8 character tag name used to identify this transducer on the LCD display DI Womni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation PL Gas Heating Value HV I O Point Enter the physical I O point number used to input this gas analysis variable Points 1 24 The data from this input signal will be used in the AGA 8 equation of state and used to calculate energy flow Enter 0 if this signal is not available to the flow computer Gas HV Transducer Tag Enter the 8 character tag name used to identify this transducer on the LCD display Auxiliary Input Assignment PL Auxiliary Input 1 I O Point Enter the physical UO point number
114. ist of menu prompts or in a random access manner by going directly to a specific group of entries Di Womni 2 1 Chapter 2 2 2 Flow Computer Configuration 2 2 3 Menu Selection Method Q INFO Characters in refer to key presses the first time as every possible option and variable will be prompted Once a computer is in operation and you become familiar with the application you can decide to use the faster Random Access Method To use the menu selection method while in the Program Mode program LED on press Setup Enter A Setup Menu similar to the one on the right will be displayed Q TIP Itis best to use the menu selection method when programming an application for SETUP MENU Misc Configuration _ Time Date Setup Printer Setup Analyser Setup PID Control Setup Grav Density Setup Temperature Setup Pressure Setup DP Inches of Water Prover Setup Station Setup Meter Run Setup Factor Setup FluidData amp Analysis Use the IMN up down arrow keys to move the cursor to the appropriate entry and press Enter to access a particular submenu The first menu Misc Configuration should always be completed first as these entries specify the number and type of input and output devices connected to the flow computer Le the menus following the Misc Configuration menu do not ask for configuration data unless a transducer has been defined Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Re
115. ition to a daily report on a specific day of the week O No batch end 1 Monday 2 Tuesday etc L1 Automatic Monthly Batch Select Enter a number 1 through 31 to automatically print a batch end report in place of a daily report on a specific day of the month O No batch end L1 Print Priority Enter 0 when the computer is connected to a dedicated printer If several computers are sharing a common printer one computer must be designated as the master and must be assigned the number 1 The remaining computers must each be assigned a different Print Priority number between 2 and 12 L1 Number of Nulls For slow printers without an input buffer a number of null characters can be sent after each carriage return or line feed A number between 0 255 will be accepted Set this to 0 if your printer supports hardware handshaking and you have connected pin 20 of the printer connector to terminal 6 of the flow computer see Chapter 3 L1 Use Default Snapshot Report Entering Y instructs the flow computer to use the default Snapshot report format Common Printer Control Codes Epson IBM amp Compatible Condensed Mode OF Cancel Condensed 12 OKI Data Models _Condensed Mode 1D Cancel Condensed 1E HP Laser Jet Il amp Compatible Condensed 1B266B3253 Cancel Cond 1B266B3053 L1 Use Default Batch Report Entering Y instructs the flow computer to use the default Batch report format L1 Use Default Daily Rep
116. l Gas Relative Density Specific Gravity G at 60 F and 14 73 psia e Real Gas Gross Heating Value per Unit Volume HV at 60 F and 14 73 psia BTU ft e Mole Fraction of Carbon Dioxide x COz e Mole Fraction of Nitrogen x No e Mole Fraction of Methane x CH These alternate methods yield estimates of the mole fraction of the following e Methane e Ethane e Propane e Normal Butane e lso Butane e Total Pentanes e Total Hexanes plus Heavier Hydrocarbon Gases e Total Diluents other than Nitrogen and Carbon Dioxide The five alternate characterization methods are 1 The Gravity Carbon Dioxide Nitrogen Method 2 The Gravity Heating Value Carbon Dioxide Nitrogen Method 3 The Gravity Heating Value Carbon Dioxide Method 4 The Heating Value Carbon Dioxide Nitrogen Method 5 The Gravity Methane Carbon Dioxide Nitrogen Method Ei Womni 5 15 Chapter 5 Flow Equations and Algorithms for S I Metric Units Revision 2774 75 5 4 2 ASME 1967 Steam Equation vr The OMNI flow computer applies the ASME 1967 steam equation This equation is a closed form solution non iterative developed using reduced properties pressure Pr and temperature parameters TI to define the reduced volume vr of steam 5 4 3 Water Density VY Acknowledgement The implementation of the Keenan amp Keyes steam tables was based on the work of Don Kyle of Kyle Engineering Inc Water density calculations performe
117. late bore diameter divided by the calculated meter tube internal diameter d orifice plate bore diameter at flowing temperature in mm Where d D meter tube internal diameter at flowing temperature in mm Pipe Reynolds Number Rp The pipe Reynolds number is used in the equation for calculating the coefficient of discharge for differential pressure flowmeters It is a correlating parameter used to represent the change in the device s coefficient of discharge with reference to the meter tube diameter the fluid mass flow rate its inertia or velocity through the device the fluid density and the fluid viscosity It is a parameter that expresses the ratio between the inertia and viscous forces and is calculated using the following equation 4 DCH mx uxD Where Rp pipe Reynolds number Gm mass flow rate at flowing actual conditions in kg sec m Universal constant 3 14159 u absolute dynamic viscosity of fluid at flowing conditions in Pascals second D meter tube internal diameter at flowing temperature in meters Rc 5 4 Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation 50 2327 0003 Rev B 5 1 7 Coefficient of Discharge C Ai INFO The coefficient of discharge as defined for and incompressible fluid flow relates the actual flow rate at flowing conditions to the theoretical reference flow rate through a device Calibration of standard primary d
118. le data points that can be any valid data type recognized by the OMNI The maximum number of points that can be transferred depends on the type of data IEEE floats 4bytes each 63 max 32 bit Integers 4 bytes each 63 max 16 bit integers 2 bytes each 127 max Packed coils or status 8 to a byte 2040 max The OMNI automatically knows what Modbus function to use and what data types are involved by the Modbus index number of the data within the flow computer database The destination index number determines the data type when the transaction is a read The source index number determines the data type when the transaction is a write L1 Destination Index Enter the database index number or address of where the data is to be stored destination index or address If the transaction is a read this will be the index number within the master OMNI s database If the transaction is a write this will be the register number within the remote slave s database Transaction 2 Target Slave ID Read Write Source Index Number of Points Destination Index Transaction 3 Target Slave ID Read Write Source Index Number of Points Destination Index Transaction 4 Target Slave ID Read Write Source Index Number of Points Destination Index Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Transaction 5 Target Slave ID Read Write Source Index
119. lizing resolution Valid decimal place settings are XX X X X XX and X XXX Gross Uncorrected Totalizer Decimal Places Enter the number of decimal places for gross totalizer resolution Net Corrected Totalizer Decimal Places Enter the number of decimal places for net totalizer resolution Mass Totalizer Decimal Places Enter the number of decimal places for mass totalizer resolution Energy Totalizer Decimal Places Enter the number of decimal places for energy totalizer resolution More Factors and System Constants Flow Weighted Average Two averaging methods are available flow weighted and time weighted These methods do not modify the averaged variable if there is no flow taking place Gas Chromatograph data is always time weighted Enter Y to calculated averages weighted by mass flow increment Enter N to calculate averages weighted by time period Select Pressure Units This entry applies to Revision 27 metric units only and is a global selection for all pressure variables within the flow computer 1Bar 100KPa 1kg cm 98 0665KPa Display resolution is XX XKPa X XXXBar or X XXXKg em Enter the pressure units you want to use 0 KPa 1 Bar 2 Kg m Select Differential Pressure Units This entry applies to Revision 27 metric units only and is a global entry which applies to all DP variables within the flow computer 1KPA 10mBar Display resolution is x xxKPa or x xmBar Enter the DP units you want to use 0
120. may not be reliable Fatal errors usually are caused by some type of hardware problem at the GC EPROM error D A converter error etc A breakdown of communications between the flow computer and the GC will also cause a GC failure error 2 44 Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation Gas Chromatograph Component Numbers Danalyzer C6 Settings Danalyzer instruments as of May 1994 group all components g C6 through C8 as a C6 group Four different groupings of C6 can be provided These groups are numbered 108 109 110 and 111 in the Danalyzer documentation For the OMNI to work correctly the Danalyzer must be setup with the C6 analysis value as the first component in its component table The OMNI will automatically determine the correct values of C6 C7 and C8 from the component code selected at the Danalyzer Because of this there should be no component number 1 in the OMNI setup Each gas chromatograph can be unique in the total number of components it can recognize and the order than they are presented For the following settings enter the component number position for each of the components listed below Enter 0 for any unused components Mol Deviation Enter the maximum deviation of the gas component If the unnormalized total is outside the limit the GC will fail to fail code Methane CH Nitrogen N3 Carbon Dioxide CO3 Ethane C2He Propane C3Hs Water HO Hydrogen
121. mple gas of X specific gravity under stable operating conditions in usec Ty periodic time of a known calibration sample gas of Y specific gravity under stable operating conditions in usec Dm 50 2327 0003 Rev B Omni 4 23 Volume 3 Configuration and Advanced Operation N Chapter 5 Flow Equations and Algorithms for S I Metric Units Revision 27 74 75 5 1 Flow Rate for Gas Differential Pressure Devices Orifice Nozzle and Venturi Gi Flow Rate Units For practical reasons the OMNI flow computer displays calculated flow rates in thousands of units per hour in comparison to the standards ISO Therefore the flow equations must be either divided or multiplied by 1000 The practical flow equations expressed below are based on the International Standard ISO 5167 1 Method is selectable Measurement of Fluid Flow by Means of Pressure Differential Devices Part 1 Orifice Plates Nozzles and Venturi Tubes Inserted in Circular Cross section Conduits Running Full 5 1 1 Mass Flow Rate at Flowing Conditions Qm Tonnes hr K x xexd x JAP xp 1 2 SE 1000 Where l velocity of approach factor Ev 1 p4 Therefore also Q _ K xCxE xexd x AP o JL ge 1 000 5 1 2 Volumetric Gross Flow Rate at Flowing Conditions Qy m hr Q H 1000 P 8 50 2327 0008 Rev B Omni 5 1 Chapter 5 Flow Equations and Algorithms for S I Metric Units Revision 2774 75
122. ne per application revision per volume You will receive the version that corresponds to your application revision Q User Reference Documentation The User Manual is structured into five volumes The volumes respective to each application revision are Revision 23 27 Volume s 3 4 Volume 1 System Architecture and Installation Volume 1 is generic to all applications and considers both US and metric units This volume describes Basic hardware software features Installation practices Calibration procedures Flow computer specifications Volume 2 Basic Operation This volume is application specific and is available in four separate versions one for each application revision It covers the essential and routine tasks and procedures that may be performed by the flow computer operator Both US and metric units are considered General computer related features are described such as Overview of keypad functions Adjusting the display Clearing and viewing alarms Computer totalizing Printing and customizing reports The application related topics may include Batching operations Proving functions PID control functions i Audit trail KR Other application specific functions Depending on your application some of these topics may not be included in your specific documentation An index of display variables and corresponding key press sequences that are specific to
123. nfiguration and Advanced Operation One Shot Boolean Points 1501 1649 The 149 Boolean flags located between 1501 and 1650 are used to store temporary data that has been received via the Modbus link or put there by a Boolean statement These Boolean variables can be sent to a digital output or used in the Boolean statements described above Scratch Pad Boolean Points 1650 1699 The 50 Boolean flags located between 1650 and 1699 can be use as momentary commands When set true they remain on for two seconds 3 2 2 Sign of Analog or Calculated Variables 5001 8999 The sign of analog or calculated variables can also be used in a Boolean statements by simply specifying the point number The Boolean value of the variable is true if it is positive and false if it has a negative value 3 2 3 Boolean Statements and Functions TIP Leave plenty of empty statements between programmed ones This will allow you to modify the execution order of your program if you need to later INFO Use the Exclusive OR function to compare 2 points The result of an Exclusive OR of 2 points is true only if both points are different states Each Boolean statement consists of up to 3 variables optionally preceded by the Boolean NOT function and separated by one of the Boolean functions AND OR Exclusive OR or EQUAL The following symbols are used to represent the functions Function Symbol NOT AND amp
124. nge tapped orifice flowmeters Ci FT coefficient of discharge at an infinite pipe Reynolds number for flange tapped orifice flowmeters Cj CT Tap Term Where C CT coefficient of discharge at an infinite pipe Reynolds number for corner tapped orifice flowmeters _ 0 5961 0 0291 8 0 2290 BF 0 003 1 8 max 2 8 D 0 0 Tap Term Upstrm Dnsirm 0 0433 0 0712e 0 1145e 0 8 Upstrm 1 0 23 19000 8 g B Rp 1 8 13 0 0116 L 0 52 a 1 2 1 2 Dnstrm OR el o4 12228 D Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation Where e Napierian constant 2 71828 L dimensionless correction for upstream tap location 1 D Lo Lo dimensionless correction for downstream tap location D upstream internal meter tube diameter or upstream diameter of a classical Venturi tube at flowing temperature in inches see 4 1 6 this chapter B diameter beta ratio see 4 1 6 this chapter Rp pipe Reynolds number referenced to the upstream internal meter tube diameter see 4 1 6 this chapter With Corner Taps Cq CT C CT 0 5959 0 0312 8 0 184 B 91 71 B R J Where Cg CT coefficient of discharge at a specified pipe Reynolds number for orifice flowmeters with corner taps B diameter beta ratio see 4 1 6 this chapter Rp pipe Reynolds number referenced to the upstream internal meter tube diameter see 4 1 6 this cha
125. nly True when both are positive l BOOLEAN POINT 10xx 25 7031 amp 7032 26 1719 1002 Snapshot report when 27 f alarm active To complete the example we assign Digital I O Point 02 Point 1002 to 1025 and select a delay on of 3000 to provide a 5 minute delay on activate 3000 ticks 3000 x 100 msec 300 seconds Set the delay off to 0 Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation 3 4 User Configurable Display Screens INFO The computer checks for the user display key presses first so you may override an existing display screen by selecting the same key press sequence The user can specify up to eight display screen setups Each display screen can be programmed to show four variables each with a descriptive tag Any variable within the data base can be selected for display Steps needed to configure a display screen are 1 Specify a sequence of up to four key presses that will be used to recall the display Key presses are identified by the A through Z character on each key For each variable four maximum 2 Specify the eight character string to be used to identify the variable Any valid characters on the keypad can be used 3 Specify the database index or point number 4 Specify the display resolution of the variable i e how many digits to the right of the decimal point Should the number exceed the display capacity the decimal w
126. not appear on the display or in OmniCom Depending on the various configuration settings of your specific metering system only those configuration options which are applicable will be displayed Q TIP Use the blank lines provided next to each configuration option to write down the PL Privileged Enter the privileged password to allow you to view and change all configuration data including other passwords PL Level 1 Enter the Level 1 password to allow entry of all configuration data except entries which determine the physical I O personality of the computer PL Level 1A Enter the Level 1A password to allow entry of Meter factors K Factors and Density Correction Factors only PL Level 2 Enter the Level 2 password which is required for operator type entries such as gravity overrides and meter factors PL Serial Port 1 Password Enter the Serial Port password All data in the Modbus database except passwords can be read via the serial ports These passwords allow writes to the Modbus database Password protection can be disabled by entering a blank field as a password PL Lockout Switch Active Serial Port 1 Enter N for the lockout switch to be inactive for this serial port Enter Y for the lockout switch to be active for this serial port PL Serial Port 2 Password Enter the Serial Port 2 Password PL Lockout Switch Active Serial Port 2 PL Serial Port 3 Password EI a Omni 2 9 Chap
127. nsity Factor Meter n Enter n represents the meter run 1 2 3 or 4 NOTE Digital densitometers can only be configured via the Random Access Method densitometer manufacturer Usually they are based on SI or metric units For US customary applications you must ensure that the constants entered are based on gr cc F and PSIG Constants are always displayed using scientific notation e g Ross 1 490205E 00 gr cc To enter Ko press Clear and press 1 490205 Alpha Shift E 00 Enter Q INFO Densitometer constants are usually on a calibration certificate supplied by the Specific Gravity Density Data Station Meter 1 Meter 2 Meter 3 Meter 4 Low Alarm Limit Enter the gravity density below which the gravitometer densitometer low alarm activates High Alarm Limit Enter the gravity density above which the gravitometer densitometer high alarm activates L2 Override Value Enter the gravity density value that is substituted for the live transducer value depending on the override code An displayed along side of the value indicates that the override value is substituted Each product setup can specify a gravity override to be used when ever that product is run The override gravity in the product setup area overrides any transducer override A 8 50 2327 0003 Rev B Omni 2 49 Chapter 2 2 50 Flow Computer Configuration L2 Override Code Enter the Override Code strategy 0 Ne
128. nsity behavior of natural gas mixtures is accurately described by the detailed characterization method for a wide range of conditions This behavior can also be accurately described for the pure components methane ethane carbon dioxide nitrogen and hydrogen and binary mixtures of these components A low density correlation was developed for propane and heavier hydrocarbons and binary mixtures of these components with methane ethane nitrogen and carbon dioxide The uncertainty of compressibility factors and density calculations for natural gases from production separators which can contain mole percentages of hexanes plus heavier hydrocarbons greater than 1 is reduced by this method Correlations were developed to reduce the calculation uncertainty of the following e Natural gases containing hydrogen sulfide sour gas correlations of the density behavior of pure hydrogen sulfide and binary mixtures of hydrogen sulfide with methane ethane nitrogen and carbon e Natural gases containing water vapor wet gas second virial correlations for water and binary mixtures of water with methane ethane nitrogen and carbon dioxide Gross Characterization Methods The following table identifies the nominal ranges of gas characteristics for which these methods are used Q NOTE Reference conditions Combustion at 60 F 14 73 psia Density at 60 F 14 73 psia Q NOTE Reference conditions Combustion at 25 C 0 101325 MPa Densit
129. of Specific Heats Te Temperature in C Ei Womni 5 19 Chapter 5 Flow Equations and Algorithms for S I Metric Units Revision 2774 75 Solartron NT 3098 Gravitometer Relative Density Specific Gravity Output Frequency Relationship Q Density and Specific Gravity Values Determined from Densitometer and Gravitometer Frequency Signals The equations used to determine the density and specific gravity via gas density and specific gravity transducers are provided by the respective manufacturers The relationship between the gravitometer output frequency and the specific gravity is given by the following 2 G Ko KoT Where G specific gravity of a gas determined from the transducer frequency signal T periodic time of the sample gas specific gravity at stable temperature and at the selected reference chamber pressure in microseconds usec Ko calibration constant Gy Kaf K calibration constant Gy T Gy Tx Ty Gx specific gravity of calibration sample gas X Gy specific gravity of calibration sample gas Y Tx periodic time of a known calibration sample gas of X specific gravity under stable operating conditions in usec Ty periodic time of a known calibration sample gas of Y specific gravity under stable operating conditions in usec 5 20 Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation 5 4 6 NX19 Analysis 1980 E
130. of approach factor dimensionless see 4 1 7 this chapter Y fluid expansion factor referenced to upstream static pressure dimensionless see 4 1 9 this chapter d orifice plate bore or nozzle Venturi throat diameter at flowing temperature in inches see 4 1 6 this chapter pt fluid density at upstream flowing conditions actual temperature and pressure in pounds mass per cubic foot lbm CF AP differential pressure in inches of water at 60 F which is the static pressure difference measured between the upstream and downstream flange tap holes or in the throat taps op fluid density at base conditions standard reference temperature and pressure in pounds mass per cubic foot lbm CF HV volumetric heating value at reference conditions in British thermal units per standard cubic foot BTU SCF 4 2 a Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation 4 1 6 Diameters and Diameter Correlations The various orifice meter flow equations require calculating the diameters of the orifice plate bore or of the nozzle Venturi throat the meter tube internally and the beta ratio These calculated diameters are also used to calculate the pipe Reynolds number which is used in calculating discharge coefficients Orifice Plate Bore or Nozzle Venturi Throat Diameter d inches The calculated diameter in inches of the orifice plate bore or of the throat of
131. ograph data is always time weighted User Programmable Digital UO Each I O point is individually configurable as either an input or output with variable delay On and delay Off Pulse widths are adjustable when used as auxiliary totalizer outputs or sampler outputs User Programmable Logic Functions Sixty four logic statements can be user programmed to control meter run switching and provide user auxiliary control functions User Programmable Alarm Functions Sixteen of the programmable logic statements described above can be used to contain custom text messages which can be displayed logged and printed 5 Womni 1 3 Chapter 1 1 17 1 18 1 19 1 20 1 21 1 22 Overview of Firmware Revisions 23 74 27 74 User Programmable Variables Sixty four user variables can be programmed to manipulate data for display and printing or remote access via a communication port Typical uses include special units conversions customer averaging algorithms for leak detection special limit checking and control functions The programmable variable statements can also be used to type cast data of one type to another i e change a floating point variable to an integer type so that a PLC or DCS system can make use of it User Display Setups The user may specify eight key press combinations which recall display screens Each user display screen can show four variables each with a descriptive tag defined by the user Us
132. olartron 5 Sarasota 6 UGC L1 Password Level required Solartron Station Meter 1 Meter 2 Meter 3 Meter 4 Ko K K2 Kis Kio Ks K Ks Sarasota Station Meter 1 Meter 2 Meter 3 Meter 4 Do To Tooet Teal Prooet Prat UGC Station Meter 1 Meter 2 Meter 3 Meter 4 EI a Omni 2 51 50 2327 0003 Rev B Chapter 2 2 52 Flow Computer Configuration 2 12 Configuring Meter Temperature you be in the Program Mode In the Display Mode press the Prog key The Program LED will glow green and the Select Group Entry screen will appear Then press Temp Enter or Temp Meter n Enter or Meter n Temp Enter n Meter Run 1 2 3 or 4 Use N W keys to scroll Q Meter Temperature Setup via the Random Access Method Setup entries require that Q NOTE Not Valid when a RTD Probe is specified 2 12 1 Accessing the Temperature Setup Submenu Applying the Menu Selection Method in the Select Group Entry screen Program Mode press Setup Enter and a menu similar to the following will be displayed SETUP MENU PID Control Setup Grav Density Setup Temperature Setup Use the J W up down arrow keys to move the cursor to Temperature Setup and press Enter to access the submenu 2 12 2 Station and Meter Run Temperature Settings Station Meter 1 Meter 2 Meter 3 Meter 4 Low Alarm Limit E a EE Enter the temperature below which the flowme
133. ompensated density in kg m 5 calibration constants supplied by Solartron TF Temperature in C ACTUAL DENSITY E EE a E 73 D K Tt 273 Where Da actual density in kg m Dt temperature compensated density in kg m K 7 calibration constants supplied by Solartron Gas Specific Gravity Ratio of Specific Heats Te Temperature in C 4 22 YY Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation Solartron NT 3098 Gravitometer Relative Density Specific Gravity Output Frequency Relationship Q Density and Specific Gravity Values Determined from Densitometer and Gravitometer Frequency Signals The equations used to determine the density and specific gravity via gas density and specific gravity transducers are provided by the respective manufacturers The relationship between the gravitometer output frequency and the specific gravity is given by the following 2 G Ko KoT Where G specific gravity of a gas determined from the transducer frequency signal T periodic time of the sample gas specific gravity at stable temperature and at the selected reference chamber pressure in microseconds usec Ko calibration constant G K T calibration constant Gx 7 Gy To X Y A ne ll Gx specific gravity of calibration sample gas X Gy specific gravity of calibration sample gas Y Tx periodic time of a known calibration sa
134. ons and Algorithms for S I Metric Units Revision 27 74 75 5 1 5 1 Flow Rate for Gas Differential Pressure Devices Orifice Nozzle and Venturi 5 1 5 1 1 Mass Flow Rate at Flowing Conditions Oe Tonnes hr c cceecceeeteeeesteeeeeeeees 5 1 5 1 2 Volumetric Gross Flow Rate at Flowing Conditions Qy mb 5 1 5 1 3 Volumetric Net Flow Rate at Base Conditions Qg M Ar ccsesccsessecseseesesseseesesneees 5 2 5 1 4 Energy Flow Rate at Base Conditions Qe GJ 5 2 915 NOMOENCIALUIC siscecnisssadetisdcaveesntdacewncsaceceanddeawdnasaleeeanddedevadadansesbanalsiedaddedavndealeevanddednvaas 5 2 5 1 6 Diameters and Diameter Correlations ssssseesesesresinssirssrresrrnsrnnsrnssinnssinnsrnnsrnssnns 5 3 5 1 7 Coefficient of Discharge C A 5 5 5 1 8 Fluid Expansion Factor e 5 8 5 2 Flow Rate for Gas Helical Turbine Flowmeter cccssssenceessseeeeeeseeneeeeneeeees 5 9 5 2 1 Volumetric Gross Flow Rate at Flowing Conditions Qy M hr c escssseesseseeeseeee 5 9 5 2 2 Mass Flow Rate at Flowing Conditions Oe Tonnes hr 0 seeeeceeeeeeeesteeeeeeeeeees 5 9 5 2 3 Volumetric Net Flow Rate at Base Conditions Qy Imbr 5 9 5 2 4 Energy Flow Rate at Base Conditions Qe Gr 5 9 525 NOMOMCIALUMC ced ssccacetstevacesdecees ce eegene See 5 10 5 3 Flow Rate for Gas Coriolis Flowmeters ccccseseecceessseeeeeeeeeeeeeeneeeeeeeeeseeeeneenas 5 11 5 4 Densities and Other Proper
135. or SG is set to 0 in the Analysis Setup menu Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation Entries for AGA 8 1994 1992 Methods The following entries apply to AGA 8 1992 and 1994 calculation methods and represent component mole percentage overrides Enter the mole percentages of each component of the gas stream These percentages are used to calculate the flowing density and heating value if the application does not have a gas chromatograph GC analyzer or the GC fails This data may be overwritten by data received from the GC All entries apply for the detailed analysis method Component Mole Override Prod 1 Prod 2 Prod 3 01 Methane CH 02 Nitrogen N3 03 Carbon Dioxide CO2 04 Ethane C2H6 05 Propane C3Hs 06 Water H20 07 Hydrogen Sulfide H2S 08 Hydrogen H3 09 Carbon Monoxide CO 10 Oxygen Oz 11 i Butane OC Hal 12 n Butane nC Hal 13 i Pentane OCH 14 n Pentane nC5H 2 22 Neo Pentane neoC H 2 15 n Hexane CH 16 n Heptane C7Hi 17 n Octane CH6 18 n Nonane 19 n Decane 20 Helium He 21 Argon Ar Total Prod 4 2 73 Chapter 2 2 74 Flow Computer Configuration Entries for AGA 8 1985 Methods NOTES These entries apply to the following AGA 8 1985 methods when selected AGA 8 1985 HV SG CO
136. or checking functions are disabled until the sum of both pulse trains exceeds the pulses per seconds entered for this setting Example Entering 50 for this threshold means that the dual pulse error checking will be disabled until both A and B channels of the flowmeter pick offs are providing 25 pulses per second each Max Error Counts Batch This entry will display only when Dual Pulse is selected under Config Meter Runs Misc Configuration It applies only when a E combo module is fitted and Pulse Fidelity Checking is enabled Enter the maximum number of error pulses allowed in one transaction for each meter run The alarm points are Q 1n48 A B Comparator Error Detected Q 1n49 A Channel Failed Q 1n50 B Channel Failed Q 1n51 A and B Channels not equal The dual pulse A B Comparator Error Alarm 1n48 is activated when the accumulated error counts between the flowmeter channels exceeds this count threshold Accumulated error counts are cleared for every batch Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B L1A K Factor 1 Configuration and Advanced Operation Meter 1 Meter 2 Meter 3 Meter 4 This entry applies for simple flow based linearization of K Factor Enter the K Factors for each meter run In this case up to 12 K Factors and the associated flowmeter pulse frequencies are entered per meter run to define the K Factor Curve The flow computer will continuously monitor the flowmeter
137. oriolis Ultrasonic Gas Flow Metering Systems 1 1 Number of Meter Runs Type of Flowmeters Minimum 1 run maximum 4 runs Typical gas orifice meter run shown 1 2 Product Configuration Parallel runs measuring the same product or independent runs with different products l TURBINE MASS t E k f ig ig E ig E k k E E ig ig ig ig E ig ig ig ig i E E F 50 2327 0003 Rev B ULTRASONIC METERS DE DED EN QE a ORIFICE METERS 9 TOD O L CF Figure 1 1 Typical Gas Flow Metering Configuration Using Turbine Coriolis Ultrasonic and Orifice Flowmeters Omni 1 1 Chapter 1 1 3 1 4 1 5 1 6 1 7 1 8 1 9 Overview of Firmware Revisions 23 74 27 74 Configurable Sensors per Meter Run Meter turbines differential pressures Rosemount Multivariable DP Honeywell Multivariable DP Instroment Qsonic V Cone Flowmeter FMC MPU1200 Equimeter AAT Daniel Ultransonic Coriolis Meter FlowSic 600 Ultrasonic meter temperature and pressure meter density density temperature and pressure Temperature Pressure and Differential Pressure Transmitters All transmitters can be 4 20mA 1 5V or Honeywell DE digital protocol types In addition temperature sensors can also be four wire DIN or American curve RTD probes connected directly Densitometers Can be configured for any combination or mix of individual or shared densitometers of an
138. ort Entering Y instructs the flow computer to use the default Daily report format L1 Use Default Prove Report Entering Y instructs the flow computer to use the default Prove report format L1 Condensed Print Mode Conirol String Certain default report templates exceed 80 columns when the computer is configured for 4 meter runs and a station Enter the hexadecimal character string which will put the printer into the condensed print mode Data must be in sets of 2 characters i e 05 not 5 A maximum of 5 control characters are allowed L1 Cancel Condensed Print Mode Control String Uncondensed Print Mode Enter the hexadecimal character string which when sent to the printer will cancel the condensed print mode Data must be in sets of 2 characters i e 05 not 5 A maximum of 5 control characters are allowed L1 Company Name Two lines of the display allow entry of the Company Name On each line enter a maximum of 19 characters and press Enter Both lines are concatenated and appear on all reports L1 Location Two lines of the display allow entry of the station location Name On each line enter a maximum of 19 characters and press Enter Both lines are concatenated and appear on all reports Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation 2 8 Configuring Gas Chromatograph GC Analyzers the Program Mode In the Display Mode press the Prog key The Program LED will glo
139. ot be an expert to operate the flow computer or use certain portions of this manual However some flow computer features require a certain degree of expertise and or advanced knowledge of liquid and gas flow instrumentation and electronic measurement In general each volume is directed towards the following users e Volume 1 System Architecture and Installation Installers System Project Managers Engineers Programmers Advanced Operators Operators o e Volume 2 Basic Operation All Users e Volume 3 Configuration and Advanced Operation e Engineers Programmers Advanced Operators e Volume 4 Modbus Database Addresses and Index Numbers Engineers Programmers Advanced Operators D Volume 5 Technical Bulletins e Users with different levels of expertise Ei x Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation Manual Structure The User Manual comprises 5 volumes each contained in separate binding for easy manipulation You will find a detailed table of contents at the beginning of each volume The User Manual comprises 5 volumes each contained in separate binding for easy manipulation You will find a detailed table of contents at the beginning of each volume Volumes 1 2 and 5 are generic to all flow computer application revisions Volumes 3 and 4 are application specific These have four versions each published in separate documents i e o
140. per Hour Variable 2 Accumulated Batch MSCF Variable 3 Meter Factor for the Batch Variable 4 Not Used The screen is recalled by pressing Gross Meter 1 Enter and displays USER DISPLAY 1 M1 MSCF 1234 56 M1 MMSCF 123456789 M1 MFACT 1 0000 EI Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation ee Chapter 4 Flow Equations and Algorithms for U S Customary Units Revision 23 74 75 4 1 Flow Rate for Gas Differential Pressure Devices Orifice Nozzle and Venturi Al Flow Rate Units For practical reasons the OMNI flow computer displays calculated flow rates in thousands of units per hour in comparison to the standards AGA and API Therefore the flow equations must be divided by 1000 The practical flow equations expressed in this section are based on the following standards American Gas Association Report N 3 Orifice Metering of Natural Gas and other Related Hydrocarbon Fluids Part 3 Natural Gas Applications AGA 3 American Gas Association Report N 5 Fuel Gas Energy Metering AGA 5 American Gas Association Report Ne 8 Compressibility Factors of Natural Gas and Other Related Hydrocarbon Gases AGA 8 American Petroleum Institute Manual of Petroleum Measurement Standards Chapter 14 Natural Gas Fluids Measurement Section 3 Concentric Square Edged Orifice Meters Part 1 General Equations and Uncertainty Guidelines API MPMS 14 3 1 American Societ
141. play appear surrounded by a dark gray border with the text in bold face characters and mono spaced font The flow computer display is actually 4 lines by 20 characters Screens that are more than 4 lines must be scrolled to reveal the text shown in the manual Sequential heading numbering is used to categorize topics within each volume of the User Manual The highest heading level is a chapter which is divided into sections which are likewise subdivided into subsections Among other benefits this facilitates information organization and cross referencing Figure captions are numbered in sequence as they appear in each chapter The first number identifies the chapter followed by the sequence number and title of the illustration Page numbering restarts at the beginning of every chapter and technical bulletin Page numbers are preceded by the chapter number followed by a hyphen Technical bulletins only indicate the page number of that bulletin Page numbers are located on the outside margin in the footer of each page xiii OMNI 6000 OMNI 3000 User Manual For Your Information Important Xiv Trademark References The following are trademarks of OMNI Flow Computers Inc e OMNI 3000 e OMNI 6000 e OmniCom Other brand product and company names that appear in this manual are trademarks of their respective owners Copyright Information and Modifications Policy This manual is copyright protected All rights reserve
142. pletes all of its transactions it will attempt to pass over master control of the Modbus link to this Modbus ID For maximum efficiency always start Modbus ID definitions from 1 Enter the Modbus ID of this flow computer if there are no other peers in sequence on the communication link Enter 0 to disable the peer to peer feature and use Serial Port 2 as a standard Modbus slave port L1 Last Master in Sequence ID Enter the slave number of the last OMNI the highest Modbus ID number in the peer to peer communication sequence This is required for error recovery Should this flow computer be unable to hand over control to the next master in sequence see previous entry it will attempt to establish communications with a Modbus slave with a higher Modbus ID It will keep trying until the ID number exceeds this entry At that point the flow computer will start at Modbus ID 1 Enter the Modbus ID of this flow computer if it is the only master on the link L1 Retry Timer Should any slave device fail to respond to a communication request the master device will retry to establish communications several times Enter the number of 50 millisecond ticks that the flow computer should wait for a response from the slave device To ensure fast recovery from communication failures set this entry to as low a number as possible Enter 3 for peer to peer links involving only OMNI flow computers Other Modbus devices may require more time to
143. pounds mass per cubic foot lbm CF reference density at base conditions standard reference temperature and pressure in pounds mass per cubic foot lbm CF K factor in pulses per thousand cubic feet Pulses MCF meter factor dimensionless volumetric heating value at reference conditions in British thermal units per standard cubic foot BTU SCF Ei Omni 4 13 Chapter 4 4 14 Flow Equations and Algorithms for U S Customary Units Revision 2374 75 4 3 Flow Rate for Gas Coriolis Flowmeters As the Coriolis Meter uses its density value internally to convert mass to actual volume pulses you should not configure the Coriolis Meter for volume pulses i e the mass measurement is accurate but the density and therefore the actual volume may not accurate OMNI therefore assumes that it is receiving mass pulses from the Coriolis meter See Omnicom Help F1 under meter configuration Therefore calculations are preformed every 500ms in the flow computer and are as described in AGA11 They are as follows Qm KLb Hr Coriolis mass pulses per second x 3600 K Factor pulses per Ib x 1000 Qf MCF Hr Qm x 1000 DENf Qb MSCF Hr Qm x 1000 DENb Qe Qb x HV 1000 where Qm Mass flowrate KLb Hr Qf Volume flowrate at actual conditions MCF Hr also referred to as Gross volume flowrate in the flow computer Qb Volume flowrate at base conditions WSCF Hr also referred to as Net volume flowrate in the flow computer
144. pter With D and D 2 Taps Cq DT 0 5959 0 0312 B 0 184 B 0 039 f 1 WE C DT i 0 01584 8 91 71 B R IT Where Cg DT coefficient of discharge at a specified pipe Reynolds number for orifice flowmeters with D and D 2 taps B diameter beta ratio see 4 1 6 this chapter Rp pipe Reynolds number referenced to the upstream internal meter tube diameter see 4 1 6 this chapter Dm 50 2327 0003 Rev B Omni 4 7 Chapter 4 Flow Equations and Algorithms for U S Customary Units Revision 2374 75 With Pipe Taps Cq PT d 830 50008 90008 4200 8 KR el C PT C PT 1 S d Where Ca PT coefficient of discharge at a specified pipe Reynolds number for orifice flowmeters with pipe taps Ci PT coefficient of discharge at an infinite pipe Reynolds number for orifice flowmeters with pipe taps C PT 15d 830 50008 9000 8 2200 p 75 Cl 1 a 10 Where C PT coefficient of discharge for orifice flowmeters with pipe taps when the pipe Reynolds number R is equal to d 10 15 0 5925 a 0 44 E Je D D 0 9354 Je 1 35 8 1 43 y Jas er D upstream internal meter tube diameter or upstream diameter of a classical Venturi tube at flowing temperature in inches see 4 1 6 this chapter d orifice plate bore diameter at flowing temperature in inches see 4 1 6 this chapter B diameter beta ratio see 4 1 6 th
145. r The unit of measure is the same as that shown on the LCD for the totalizer i e barrels klbs m etc The maximum count rate is limited to 10 counts per second Count rates higher than 10 pulses per second will cause the computer to remember how many counts did not get output and continue to output after the flow stops until all buffered counts are output Remark D Enter a remark in this 16 character field which identifies and documents the function of each front panel counter Pulses Unit Enter the number of pulses per unit volume mass energy 2 5 11 Programmable Boolean Statements starting at Point 1025 continuing through 1088 Each statement can contain up to 3 Boolean variables optionally preceded by the slash denoting the NOT Function and separated by a valid Boolean operator Program Booleans These 64 Boolean statements are evaluated every 100 msec LU Operator Symbol Operator Symbol Operator Symbol NOT if AND amp OR EXOR j EQUAL IF GOTO G MOVE COMPARE INDIRECT RISING FALLING EDGE EDGE ONE SHOT E g 1025 1002 amp 1003 Boolean 1025 is true when point 1002 is true AND point 1003 is NOT true NOTE Points 1002 and 1003 in this example reflect the status of Physical Digital I O Points 2 and 3 There are no limitations as to what Boolean points can be used in a statement Statements can contain the results from other statements E g 102
146. r needed to convert the Solartron densitometer readings from Kg m to Lb ft default 0 062428 L1 Atmospheric Pressure Enter the Atmospheric Pressure in PSla US units or absolute metric units KPaa or mBara This is used to convert flowing gauge pressure readings in PSlg to PSla absolute pressure units for US units and for the metric version to absolute units KPaa or mBara in conformance with pressure metric units selected Absolute pressure is required for the equations of state L1 Ft to Gallon Factor This entry applies to Revision 23 US units only Enter the number of gallons in a cubic foot default 7 480556 L1 Base Pressure Enter the contract base pressure in PSla US units or absolute metric units KPAa or mBara in conformance with pressure metric units selected This is required by the AGA 8 density equation L1 Base Temperature Enter the contract base temperature in F US units or C metric units This is used by the AGA 8 density equation L1 Density of Air This entry is needed only for natural gas measurement where AGA 8 will NOT be used to calculate density at base conditions see Specific Gravity entry in the Fluid Data amp Analysis menu Entering 0 forces the flow computer to use AGA 8 to calculate density at base conditions Net flow is calculated by dividing mass flow rate by density at base conditions DI Omni 50 2327 0003 Rev B Volume 3 50 2
147. r pressure effects at the densitometer for each meter run If the densitometer has no pressure sensor fitted enter the same I O point assignment as the meter run pressure sensor Dens Press Transducer Tag Enter the 8 character tag name used to identify this density pressure transducer on the LCD display 2 16 Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation 2 5 8 PID Control UO Assignments Proportional Integral Derivative PID For practical reasons we refer to PID Control Loops in this manual However your flow computer actually performs the Proportional Integral PI function and does not apply the derivative term The addition of the derivative term would greatly complicate tuning of the control loop and besides is not normally applicable to the types of flow and pressure control used in pipelines assigned to be the primary or secondary controlled variable see Volume 4 for a complete Q Valid Assignments Any integer or floating point variable within the database can be listing of database addresses and index numbers Enter 1 2 3 or 4 at Config PID ni of the Misc Setup menu to open the following password Privileged Level PL entries Loop 1 Loop 2 Loop 3 Loop 4 Assign Primary Variable Enter the database index number of the primary variable in the PID loop Remarks ss Enter a remark in this 16 character field to identify the func
148. ram Mode press Setup Enter and a menu similar to the following will be displayed SETUP MENU Printer Setup Analyser Setup PID Control Setup Use the IHF up down arrow keys to move the cursor to PID Control Setup and press Enter to access the submenu 2 10 2 PID Control Output Settings Loop 1 Loop 2 Loop 3 Loop 4 Operating Mode Manual Valve Open Y N Enter Y to adjust the valve open and adjust using the M V keys Enter N to change to AUTO mode Local Setpoint Y N Enter Y to use a local set point and adjust using the Lut keys Enter N for Remote set point mode Secondary Setpoint Value Enter the value in engineering units for the set point of the secondary variable The primary variable will be the controlled variable until the secondary variable reaches this set point The secondary variable will not be allowed to drop below or rise above this set point depending on the Error Select entry in the Config PID menu Tuning Adjustments L1 Primary Gain Factor Enter a value between 0 01 to 99 99 for the Primary Gain Factor Gain 1 Proportional Band L1 Primary Integral Factor Enter a value between 0 0 and 40 00 for the Primary Integral Factor Repeats Min 1 Integral Factor gt the reciprocal of the reset period L1 Secondary Gain Factor Enter a value between 0 01 to 99 99 for the Secondary Gain Factor Gain 1 Proportional Band The actual controller g
149. rd Error Select action forward no J no JL Enter H for High Enter L for Low Error Select Error Select Mode 1 The controller will attempt to control the primary variable but will switch to controlling the secondary variable should the controller be trying to drive the secondary variable ABOVE its setpoint An example of this mode would be controlling flow rate primary while not exceeding a MAXIMUM delivery pressure secondary Mode 2 The controller will attempt to control primary variable but will switch to controlling the secondary variable should the controller be trying to drive the secondary variable BELOW its setpoint An example of this mode would be controlling flow rate primary while not dropping below a MINIMUM pressure value Secondary Startup Mode L M This entry determines how the computer handles a system reset such as a momentary loss of power Enter L Last to cause the PID loop to stay in the operating mode it was last in before the system reset Enter M Manual to cause the PID loop to startup with the PID loop in manual control mode and with the valve open as it was before the system reset PID Tag Enter an 8 character tag name to identify the PID controller output signal on the LCD display 2 18 Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation 2 5 9 Analog Output Assignments Press n Enter at Config D A Out n of the Mis
150. rs and gravitometers e Sarasota Peek e UGC e Solartron Sarasota Density Ib CF Sarasota density is calculated using the frequency signal produced by a Sarasota densitometer and applying temperature and pressure corrections as shown below e pcpx Pelta 1K i t 2xt 0 Where Dc corrected density DCF Q NOTE Density correction factor Do must be expressed in pounds per cubic foot Ib CF calibration constant in mass volume densitometer oscillation period in microseconds usec to calibration constant in microseconds to Tcoef X Tt Tcal Pcoef X Pf Peal to K spool calibration constant Ti flowing temperature in F Tcoef temperature coefficient in usec F P flowing pressure in psig Pcoef pressure coefficient in usec psig Peal calibration pressure in psig 4 20 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation UGC Density Ib CF Q Density and Specific Gravity Values Determined from Densitometer and Gravitometer Frequency Signals The equations used to determine the density and specific gravity via gas density and specific gravity transducers are provided by the respective manufacturers UGC density is calculated using the frequency signal produced by a UGC densitometer and applying temperature and pressure corrections as shown below UNCORRECTED DENSITY D K K xt K xt Where D uncorrected density in I
151. rt Transmitters L1 at 20mA SS Enter the pressure engineering units that the transmitter outputs at 20mA or 5volts or upper range limit URV of Honeywell Smart Transmitters Station Meter 1 Meter 2 Meter 3 Meter 4 This entry only applies to Honeywell digital transmitters connected to an H Type combo module The process variable i e pressure is filtered by the transmitter before being sent to the flow computer The time constant used depends on this entry For Pressure Transmitters enter the selected Damping Code 0 0 seconds 5 2 seconds 1 0 16 seconds 6 4seconds 2 0 32 seconds 7 8 seconds 3 0 48 seconds 8 16 seconds 4 1 seconds 9 32 seconds 2 13 3 Station and Meter Run Density Pressure Settings Meter Density Pressure Setup via the Random Access Method To access these settings in the Program Mode press Density Press Enter INFO The Density Pressure sensor is used to compensate for pressure effects which V effect the periodic time of oscillation of the densitometer It is also used when desired to calculate the density of the liquid at the densitometer to equilibrium pressure using API 2540 MPMS 11 2 1 or 11 2 2 Q NOTE Not Valid when a RTD Probe is specified Station Meter 1 Meter 2 Meter 3 Meter 4 Low Alarm Limit ee e o o Enter the pressure below which the densitometer low alarm activates Transducer values approximately 5 below this entry activate the transducer fa
152. rt or as a peer to peer communication link Using the peer to peer link allows multiple flow computers to be interconnected and share data Enter Y at Peer Peer Comm Y of the Misc Setup menu to open the following submenu L1 Activate Redundancy Mode The active redundancy mode feature allows two flow computers to operate as a pair Each flow computer receives the same process signals and performs the same calculations i e in redundancy This mode is typically used in critical applications where failure of a flow computer cannot be tolerated Enter Y to allow both flow computers to manage the peer to peer link between them and automatically switch between being the master or slave computer Important data such as meter factors and PID control settings can be continually exchanged between flow computers ensuring that at any time should a failure occur to one the other unit would be able to assume control of the PID and ticketing functions The redundancy mode requires that four digital I O ports be cross connected to sense watchdog failure modes using the following points 2714 Input master status 2864 Output Master status 2713 Input watchdog status 2863 Output of watchdog status See Technical Bulletin 52 0000 0002 TB 980402 L1 Next Master in Sequence Enter the slave number of the next flow computer in sequence in the peer to peer communication sequence to pass over control After the flow computer com
153. saaes 1 5 Flow Computer Configuration visicccisissscesanistcassasnecssenscasasancesssssedsacasansnacasenscadeseaanas 2 1 Cu Tue Tt Le BEE 2 1 2 2 Configuring with the Keypad in Program MOde cccsssseeeesssseeeeeeseeeeeneeenes 2 1 2 2 1 Entering the Program Mode AAA 2 1 2 2 2 CHANGING Kate 2eegegeegegundh erer Zederge caeeahcsbavens oahea deeg deeg EEN ee ee 2 1 2 2 3 Menu Selection Method 2 2 2 2 4 Random Access Method 2 3 Omni 50 2327 0003 Rev B Volume 3 2 3 2 4 2 5 2 6 2 7 2 8 Configuration and Advanced Operation EE 2 4 GOTH FSU PS ieee sscceateceeseesscavaceescevecsee ciexcnerereesnsates ET 2 5 Program Inhibit SOW UG Seegen eregeeegee eersten Eege CERS 2 6 Configuring the Physical Inputs Outputs scccceeeeeeeeeeeeeeeeeeeeeeeeeenseeeeenees 2 7 2 5 1 Miscellaneous I O Configuration Misc Setup Menu 2 8 2 5 2 Physical I O Points not Available for Confiouraiion 2 9 2 5 3 Password Maintenance Settings 0 cceccceceeeeeeeeeeeeeeseeeeeseaeeeseaeeseeeeeseaeeesaeeneneeee 2 9 2 5 4 Entries Requiring a Valid Privileged Password 2 10 NR Oe E e EE 2 11 2 5 6 Meter Station I O Aesonments e 2 12 2 5 7 Meter Run I O Assignments cent eeeeaee cence ceaeeeeaaeeeeneeseaeeesaaesseneeseaees 2 14 2 5 8 PID Control I O Aeslonments cent eeeeaeeceeeeeceaeeeeaaeseeaeeseeeeesaaeeneneeseaees 2 17 2 5 9 Analog Output Aeslonments cece eeeeaeeeeeeeeceaeeesaaeeeeneeseaeeesaaeese
154. se there is more Press Prog or Enter once to exit the help system and return to your original screen Chapter 2 2 4 2 6 Flow Computer Configuration Program Inhibit Switch A Program Inhibit Switch mounted behind the front panel prevents unauthorized changing of data when in the Inhibit position Most data can be viewed while the switch is in the program inhibit position but any attempt to alter data will be ignored and cause PROGRAM LOCKOUT to be displayed on the bottom line of the LCD display The inner enclosure of the flow computer can be locked or sealed within the outer enclosure blocking access to the Program Inhibit Switch CAUTION These units have an integral latching mechanism which first must be disengaged by lifting the bezel upwards before withdrawing the unit from the case RESET SWITCH RIBBON CABLE TO FRONT PANEL ENABLE R LOCK MEMORY BACKUP 3 BATTERY PROGRAM LOCKOUT SWITCH Figure 2 1 Figure Showing Program Inhibit Switch Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation 2 5 Configuring the Physical Inputs Outputs TIP It is best to use the Menu Selection Method see 2 2 3 this chapter when programming an application for the first time as every possible option and variable will be prompted Once a computer is in operation and you become familiar with the application you can decide to
155. ssssssssnnnunnnnnnnnnnnnnnnnnnnnnnnnnnnnn 1 3 1 14 User Programmable Digital I O ccccccseeeeessseeeeeeeseeeeeeeeeeeeeeeeeeseeeeeenseeeeeeeeeeeenaees 1 3 1 15 User Programmable Logic Functions sssussssennennnnnnnnunnnnnnnnnnnnnnnnnnnnnnnnn nnmnnn 1 3 1 16 User Programmable Alarm Functions cccceeeteeeseeeeeeeeeeeeeeeeeeeseeeeeeeeeeeeneennees 1 3 1 17 User Programmable Variables ccccccssseeeessseeessesssensneneeeeeeeeensesseeeneeeeeseensssees 1 4 1 18 User Display Setups wicciccancccsstencetecsaseaceianastecdeexeteccenetees EENS EEN 1 4 1 19 User Report Templates iiss nsciccecessasiesesescncassuiestenueacssatestenaasieseseiedeessaesnsietsinncnssis 1 4 1 20 Serial Communication LUA Ss uae aicisns occ scesccct sats concn sectcnteeenceveensene sei eeetectieesatbleees 1 4 1 21 Peer to Peer COMMUNICATIONS ccccseeeeeeesseeeeeeeseneeeeeeeseeeeeeeseeeeeeeesseeeeesseeneeaees 1 4 1 22 PICHIVG DOE E 1 4 1 23 Omnicom Windows Version Software Communications Package 1 5 1 24 OmniView Window Version Software Communications Package seen 1 5 1 25 Detailed Daily Report sssusnnsesnnunnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnmnnn 1 5 1 26 Maintenance Mode sssssssunnnsennnnnnunnnnnnnnnnnnunnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn nnmnnn nnmnnn 1 5 1 27 HART PEOtoGol wvtcsiisssscsciess sensiticnacssasusstswsncnenssanaisnncecasarasnantensiiaessescnntiessaisssaesinaaa
156. ssure to absolute static pressure measured at the upstream tap When static pressure is measured at upstream flange tap holes AP 4 NP When static pressure is measured at downstream flange tap holes AP LS NP AP Where AP orifice differential pressure in inches of water at 60 F N unit conversion factor 27 707 Du absolute static pressure at the upstream tap Pi2 absolute static pressure at the downstream tap K isentropic exponent 4 10 YY Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation With Pipe Taps Y 1 0 333 1 145 8 0 7 6 12 8 K Where Y fluid expansion factor based on the absolute static pressure at the upstream tap B diameter beta ratio see 4 1 6 this chapter D e HE upstream acoustic ratio K vu ratio of differential pressure to absolute static pressure measured at the upstream tap AP x NP Where AP orifice differential pressure in inches of water at 60 F N unit conversion factor 27 707 Du absolute static pressure at the upstream tap K isentropic exponent Upstream Expansion Factor for ASME Flow Nozzles and Classical Venturi Tubes Krt 1 6 lee Y x 7 pa 2k x zo k 1 1 Bor l r Vu fluid expansion factor at upstream pressure conditions Where x isentropic exponent a l pressure ratio P P Where P absolute upstream static pressure of the fluid Pz absolute downstre
157. standard provides computation methodology for compressibility and super compressibility factors and densities of natural gas and other hydrocarbon gases Of the three editions the July 1994 edition is considered the most reliable accurate and complete However due to contract requirements or other conditions some users may want to apply an earlier AGA 8 version The December 1985 edition of AGA 8 incorporates improvements to the accuracy of computations compressibility and super compressibility factors beyond the capabilities of AGA s Manual for the Determination of Super compressibility Factors for Natural Gas December 1962 Catalog N L00304 Other improvements included in this version were the expansion in the ranges of gas composition temperature and pressure and applications to gas thermodynamic properties A very significant improvement to this standard is apparent in the AGA 8 November 1992 edition Major changes incorporate more precise computations of compressibility factors and densities of natural gas and related hydrocarbon gases calculation uncertainty estimations and upgraded FORTRAN computer program listings Other improvements include enhanced equations of state more accurate calculations for rich gases based on new velocity of sound data revised correlation methodology The current AGA 8 manual was updated in July 1994 for the purpose of correcting typographical errors found in the previous edition improving the
158. start hour on January 1 If statement 1834 is true we reset counter 7025 SH Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation 3 3 3 Entering Values Directly into the User Variables In some cases it may be necessary to enter data directly into a user variable not the expression just the variable For example to preset the Report Number Variable 7025 in the example above we proceed as follows While in the Display Mode press Prog Input Enter the following will display Current value can be USER VARIABLE 7025 changed by the user Value 1234 7025 1835 Expression for this lt variable cannotbe changed from this entry 3 3 4 Using the Variable Expression as a Prompt Entering plain text into the expression associated with the variable causes the computer no problems It ignores the text and leaves the variable unchanged For example USER VARIABLE 7025 Value 00018 Enter Lbs to SCF 3 3 5 Password Level Needed to Change the Value of a User Variable The first four variables 7025 7026 7027 and 7028 require Level 2 password The remaining variables require Level 1 Ei 50 2327 0003 Rev B Womni 3 13 Chapter 3 3 14 User Programmable Functions 3 3 6 Using Variables in Boolean Expressions Q NOTE See the beginning of this chapter on how to program a Boolean expression if necessary In some cases it is also necessary to
159. stitute dummy bytes in the message string Outgoing messages will always include the error checking bytes L1 Modicon Compatible Y N Computer Default Mode N Enter Y to configure these Modbus ports to be compatible with Modicon PLC equipment e g 984 series and DCS systems e g Honeywell TDC3000 systems using the Advanced Process Manager APM SI This entry will be disabled for Serial Port 1 if a printer is selected as the port type In this mode the point number indexes requested and transmitted while using the Modbus RTU modes are actually one less than the index number documented in this manual ASCII mode transmissions use the address documented in this manual Data is counted in numbers of 16 bit registers rather than points i e To request two 4 byte IEEE floating point variables index numbers 7101 and 7102 would require the host to ask for 4 registers starting at index 7100 IEEE Floating Point data bytes are transmitted in swapped format NORMAL IEEE FLOAT FORMAT Byte 1 Byte 2 Byte 3 Byte 4 Byte 1 Byte 2 Byte 3 Byte 4 Biased MS Manti LS Kaes LS Biased MS Exponent Mantissa anlissa Mantissa Mantissa Exponent Mantissa L1 CRC Enabled eseeeeeeeees Computer Default Mode Y Many protocols use either a CRC LRC or BCC error check to ensure that data received is not corrupted The flow computer can be configured to ignore the error checking on incoming messages Th
160. t calibration constants used to scale zero and span settings to the default value This will require you to re calibrate all the outputs You can also do this on a channel by channel basis by entering the output channel number 2 5 5 Module Settings Enter Y at Check Modules of the Misc Setup menu and a screen similar to the following will display MODULE S WARE H WARE Y Y Update S Ware PL Update S Ware Y e A table is displayed showing all of the physically installed UO modules verses the UO modules recognized by the software see display example above You must answer the Update Software question entering Y whenever you change the number or type of installed modules The available I O point numbers are allocated to each module at this time according to the type and number of each module see Chapter 2 for more information Womni 2 11 Chapter 2 2 12 Flow Computer Configuration 2 5 6 Meter Station UO Assignments INFO The number of process variable I O points available depends on the number of combo modules installed see Chapter 2 in Volume 1 for more information Point numbers range from 01 through 24 Assign 0 to invalidate the assigning of a variable LO Type Mismatch The computer will not let you assign the same I O point to incompatible transducer types Le an I O point cannot be assigned as a temperature input for Meter Run 1 and a pressure input for Meter Run 2 If
161. t numbers to our statements and re write them the way they will be input 1030 NOT SW3 AND NOT SW4 30 10138 1014 1031 NOT SW1 AND NOT SW2 31 10118 amp 1012 The final Equations to determine the state of V1 V2 V3 and V4 are as follows V1 NOT SW2 AND NOT SW3 AND NOT SW4 OR Zone 1 23 1012 amp 1030 1026 V2 NOT SW1 AND NOT SW3 AND NOT SW4 OR Zone 2 33 1011 amp 1030 1027 V3 NOT SW1 AND NOT SW2 AND NOT SW4 OR Zone 3 34 10318 amp 1014 1028 V4 NOT SW1 AND NOT SW2 AND NOT SW3 OR Zone 4 35 10318 amp 1013 1029 The computer evaluates each expression from left to right so the order of the variables in the above statements is critical The logic requires that the OR variable comes last EI Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation The final program consists of 11 statements BOOLEAN POINT 10xx 1825 amp 1826 18248 amp 1025 182481025 1824 amp 18258 amp 1826 1824 amp 1825 amp 1826 1013 amp 1014 1011 amp 1012 1012 amp 1030 1026 1011 amp 1030 1027 1031 amp 1014 1028 10318 amp 1013 1029 The only thing left to do now is assign Booleans 1032 1033 1034 and 1035 to the appropriate digital I O points which control V1 V2 V3 and V4 Here is a summary of all of the digital I O as assigned Valve 1 Fully Open Switch Valve 2 Fully Open Switch Valve 3 Fully Open Switch Valve 4 Fully Open Switch Valve 1 Actuator Valve 2 Actuator Valve 3 Actuator Valve 4
162. ter 1 Modbus RTU L1 Modbus Protocol Type Computer Default Mode 2 This entry does not apply to Serial Port 1 Enter the type of protocol to be used on this port 0 Modbus RTU 1 Modbus ASCII 2 Modbus RTU modem Serial Port 4 has the following additional options 3 Allen Bradley Full Duplex 4 Allen Bradley Half Duplex Mixed protocols are not allowed on a communication link All devices must use the same protocol type The RTU protocol is preferred as it is twice the speed of the ASCII Selecting Modbus RTU Modem provides RTU protocol with relaxed timing which is usually needed when communicating via smart modems These modems have been found to insert inter character delays which cause a premature end of message to be detected by the flow computer IMPORTANT You must select either Modbus RTU or Modbus RTU Modem protocol for the port that will be used to communicate with OmniCom PC configuration software l Womni 2 31 Chapter 2 2 32 Flow Computer Configuration L1 Modbus ID ENEE Computer Default Mode ID 1 This entry does not apply to Serial Port 1 when a printer is selected as the port type Enter the Modbus slave ID number that this serial port will respond to 1 through 247 acceptable This entry will be disabled for Serial Port 1 if a printer is selected as the port type Q Skip CRC LCR Check If you have disabled the error checking on incoming messages you must sub
163. ter 2 2 10 Flow Computer Configuration PL Lockout Switch Active Serial Port 3 PL Serial Port 4 Password PL Lockout Switch Active Serial Port 4 PL Serial Port 5 Password PL Lockout Switch Active Serial Port 5 PL Serial Port 6 Password PL Lockout Switch Active Serial Port 6 2 5 4 Entries Requiring a Valid Privileged Password The following entries display only when a Valid Privileged Password is entered PL Model Number 0 3000 1 6000 This entry is used by the OmniCom configuration software to determine the maximum UO capability of the computer PL Disable Download Enter Y to prevent OmniCom from downloading the configuration file to the OMNI Flow Computer PL Re configure Archive Enter Y to re configure archive records definition Enter N when finished PL Archive Run Y N Enter Y to start the archive running A CAUTION If you change the number or type of installed I O modules you must perform the Check Modules Function to inform the computer that you wish to use the new hardware configuration PL Start Screen Default Y N Enter Y N for the computer to return to the last viewed display after a reset or power down Default is N If using default user must review historical alarm for any system fail codes PL Dual Pulse Comparison Delay Cycle 0 20 Maximum threshold and dual pulse delay cycle Dual Pulse Comparison will be activated w
164. ter Run Valve Switching l Y Omni 3 7 Chapter 3 3 8 User Programmable Functions 3 2 4 How the Digital I O Assignments are Configured We will use Physical I O Points 11 12 13 and 14 to connect to valve limit switches SW1 SW2 SW3 and SW4 respectively The switches activate when the appropriate valve is fully open The points are designated as inputs by assigning them to the dummy input Boolean Point 1700 see the Command and Status Booleans on a later page Their data base point numbers are simply their I O point number preceded by 10 e g I O Point 11 1011 Physical I O points 15 16 17 and 18 are wired so as to open the meter run valves V1 V2 V3 and V4 They will be assigned to the Boolean Flags 32 Point 1032 through 35 Point 1035 which represent the required state of V1 through V4 as explained below The Boolean equations are as follows V1 NOT SW2 AND NOT SW3 AND NOT SW4 OR Zone 1 Valve 1 is opened when the flow is in Zone 1 and will remain open until at least 1 of the other 3 valves is fully open Valves V2 V3 and V4 are programmed in a similar fashion V2 NOT SW1 AND NOT SW3 AND NOT SW4 OR Zone 2 V3 NOT SW1 AND NOT SW2 AND NOT SW4 OR Zone 3 V4 NOT SW1 AND NOT SW2 AND NOT SW3 OR Zone 4 To simplify we pre process the common terms The term NOT SW3 AND NOT SW4 is used to determine V1 and V2 The term NOT SW1 AND NOT SW2 is used to determine V3 and V4 Assigning the next valid poin
165. ter low alarm activates Transducer values approximately 5 below this entry fail to low High Alarm Limit ee es Enter the temperature above which the flowmeter high alarm activates Transducer values approximately 5 above this entry fail to high L2 Override Enter the temperature value that is substituted for the live transducer value depending on the override code An displayed along side of the value indicates that the override value is substituted L2 Override Code Enter the Override Code strategy 0 Never use override code 1 Always use override code 2 Use override code on transmitter failure 3 On transmitter failures use last hour s average L1 at 4mA So ee se ee eet Enter the temperature engineering units that the transmitter outputs at 4mA or 1volt or lower range limit LRV of Honeywell Smart Transmitters L1 at 20mA Enter the temperature engineering units that the transmitter outputs at 20mA or 5 Volts or upper range limit URV of Honeywell Smart Transmitters DI Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation Station Meter 1 Meter 2 Meter 3 Meter 4 This entry only applies to Honeywell digital transmitters connected to an H Type combo module The process variable i e temperature is filtered by the transmitter before being sent to the flow computer The time constant used depends on this entry For Temperature Transmitters enter
166. the nozzle or Venturi tube at flowing temperature is used in the flow equations to calculate flow rates and the orifice Reynolds number It is the internal diameter of the orifice plate measuring aperture bore or throat computed at flowing temperature and is defined as follows d d i a T mle J Where d orifice plate bore or nozzle Venturi throat diameter at flowing temperature in inches dr reference orifice plate bore or nozzle Venturi throat diameter at reference temperature in inches aq linear coefficient of thermal expansion of the orifice plate or nozzle Venturi throat material in in F Tf temperature of the fluid at flowing conditions in F Tri reference temperature for the orifice plate bore or nozzle Venturi throat diameter in F Upstream Meter Tube Pipe Internal Diameter D inches The calculated upstream internal meter tube diameter in inches at flowing temperature is used in the flow equations to calculate the diameter ratio and the pipe Reynolds number It is the inside diameter of the upstream section of the meter tube computed at flowing temperature and is defined as follows D D a T T Where D upstream internal meter tube diameter or upstream diameter of classical Venturi tube at flowing temperature in inches Dr reference meter tube internal diameter at reference temperature in inches a2 linear coefficient of thermal expansion of the meter tube material
167. the CO Type Mismatch message is displayed recheck the I O Shared Transducers Enter the same I O point to share transducers between meter runs Correcting a Mistake Enter an I O point of 0 to cancel an incorrectly entered I O point then enter the correct number Assigning I O Point 99 This indicates that the associated variable will be available for display and be used in all calculations but will not be obtained via a live input The variable value is usually downloaded into the flow computer database via a communication port or via a user variable statement 01 00 Enter Y at Config Station of the Misc Setup menu to open the following entries PL Station Configured As Station Totals and Flows Defined As Define which meter runs will be included in the station flow rates and totalizers Meter data can be added or subtracted Example Entering 1 2 8 4 defines the station flows and totals as the result of Meter Runs 1 and 2 added together subtracted by the flows of Meters 3 and 4 Enter 0 for no station totalizers PL Reference Specific Gravity SG I O Point Enter the physical I O point number used to input the gas specific gravity at reference conditions Points 1 24 the live SG will be used in the AGA 8 equation Enter 0 if no live SG is available SG Transducer Tag Enter the 8 character tag name used to identify this SG transducer on the LCD d
168. the analyzer value overwrites this entry in the 1 product area only L1 LBS MMCF Water Content This entry applies to Revision 23 US units only Enter the amount of water that the gas contains in Lbs MMCF It is used to calculate the correction factor FWV Due to the resolution of FWV X XXXX water contents of 7 Lbs MMCF and less produce FWV factors of 1 0000 Factor FWV corrects the net volume and therefore energy for water content Enter zero if a GC is providing water content in the compositional analysis E Womni 2 71 Chapter 2 2 72 Flow Computer Configuration 2 18 3 Additional Settings for Natural Gas Product Q INFO AGA 8 can also be used for many other gas mixtures including carbon dioxide Prod 1 Prod 2 Prod 3 Prod 4 Density Method Enter the AGA 8 calculation method for characterization of the natural gas mixture see selections below You must select a detailed method if you will be connected to a gas chromatograph analyzer 0 Disable AGA 8 Calculations 1 1994 Detailed Analysis AGA10 is available when 1994 Density Method 1 selected 2 1994 HV SG COs 3 1994 SG N2 COs 4 1992 Detailed Analysis 5 1992 HV SG CO 6 1992 SG N2 COs 7 1985 Detailed Analysis 8 1985 HV SG COs 9 1985 HV SG N2 CO 10 1985 SG N2 CO 11 1985 HV N2 CO 12 1985 SG CO2 C4 17 Redlich Kwong 19 Ideal Gas Calculation
169. the flow computer should wait for results from either type of gas chromatograph When operating with an Applied Automation analyzer the flow computer will request results from the chromatograph if it is not in the listen only mode The GC Alarm bit will be set if no results are received after this request Danalyzer Type 0O USA 1 ISO If USA version is selected Modbus point 7054 of Danalyzer will be read as Actual BTU otherwise will be read as WOBBE index Danalyzer Heating Value 0 Actual BTU 1 Dry Superior Select the register for the flwo computer to read to acquire the heating value from the Danalyzer The choices are Actual BTU 7054 and Dry Superior 7033 available with firmware version 27 75 01 and up A 50 2327 0003 Rev B Omni 2 43 Chapter 2 Flow Computer Configuration Listen Only Mode Enter Y to set the flow computer to the Listen Only mode Enter N to disable this mode In many cases more than one flow computer will be connected to a single gas analyzer Only one flow computer is allowed to act as a host device and request data from the analyzer All of the remaining computers must listen to the result data only GC Fail Code The selections are 0 Always use GC 1 1 Always use the last good analysis from the GC 2 Use override on GC 1 Failure 3 GC 1 Fail to GC 2 4 Always Use GC 2 A failure may be due to a fatal error flagged by the GC indicating that the composition data
170. the valve movement is limited per 500 msec at shutdown When the 17 PID Permissive is lost the control output will ramp down towards 0 at the shutdown ramp rate During the ramp down phase a 2 PID Permissive PID 1 4 gt database points 1752 1755 is used to provide a ramp hold function If this om permissive is true 100 msec before entering the ramp down phase the control output will ramp down and be held at the minimum ramp down limit see the following entry until it goes false The control output will then immediately go to 0 L1 Minimum Ramp to Enter the minimum percentage that the control output will be allowed to ramp down to In many cases it is important to deliver a precise amount of product This requires that the control output be ramped to some minimum and held there until the required delivery is complete The control output is then immediately set to 0 Primary Controlled Remote Setpoint Variable L1 Low Limit Enter the engineering unit value below which the primary setpoint variable is not allowed to drop while in the remote setpoint mode L1 High Limit Enter the engineering unit value above which the primary setpoint variable is not allowed to rise while in the remote setpoint mode Secondary Controlled Setpoint Variable L1 Zero Value If a secondary controlled variable is used enter the value in engineering units of the variable which will represent zero L1 Full Scale
171. ties Of GAS cccccceeeeeeseeeeeeeeeseeeeeeeseeeeeeeeseeneeeneees 5 12 5 4 1 AGA Report N 8 Compressibility for Natural Gas and Other Related Hydrocarbon EIERE eege Seege eege eege A EA E OT 5 12 5 4 2 ASME 1967 Steam Equation ur 5 16 5 4 3 Water Density vaiasietnde cette ueti adits Mie dain dasa Geel le daria 5 16 5 4 4 NBS Density Viscosity Isentropic Exponent Sound Velocity and Enthalpy 5 16 5 4 5 Density and Relative Density Specific Gravity Calculated from Digital Densitometer and Gravitometer Output Frequency ccccceceeeeeeeeeceeeeeeeeeeeesaaeseeeeeseeeesaeeeeaeeee 5 17 Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation 5 4 6 NX19 Analysis 1980 Edttoni ee eceeeeeeeeeeeeeeeeeeeeeaeeseaeeseeeeetaeeeeeaeeee 5 21 Dm 50 2327 0003 Rev B Omni vii OMNI 6000 OMNI 3000 User Manual viii Figure Figure 3 1 3 2 3 3 Figure Figure Figure 2 1 1 Contents of Volume 3 Figures of Volume 3 Typical Gas Flow Metering Configuration with Turbine and OrificeFlowmeters 1 1 Figure Showing Program Inhibit Switch eccceeeeeeee eens ee eecaeeeeeeeeeeeeeaeeeeeeeeenees 2 6 Figure Showing Automatic Four Meter Flow Zone Thresholds seesseeeseesseeee 3 6 Figure Showing Four Meter Run Valve Switching ssesssssseesssssrssssrrssrnssrnssrnesrnses 3 7 Keypad Layout A through Zkeys scenes eeeaeeeeaaeseeeeeseeeesaeeees 3 16 SIT 5
172. tion of each variable assignment Primary Action F R Enter F forward action if the value of the primary variable increases as the controller output increases Enter R reverse action if the value of the primary variable decreases as the controller output increases Remote Setpoint UO Point Enter the I O point number that the remote set point analog signal is connected to 01 24 Assign this point to 99 in cases where the set point will be downloaded via a communication port Enter 0 if you will not be using a remote setpoint Assign Secondary Variable Enter the database index number of the secondary variable in the PID loop Remarks Enter a remark in this 16 character field to identify the function of each variable assignment Secondary Action F R Enter F forward action if the value of the primary variable increases as the controller output increases Enter R reverse action if the value of the primary variable decreases as the controller output increases Ei Womni 2 17 Chapter 2 Flow Computer Configuration Loop 1 Loop 2 Loop 3 Loop 4 Error Select L H This entry determines the circumstances under which the primary or secondary variables are controlled Enter L for low or H for high error select according to the following modes MODE 1 MODE 2 forward forward KZ yes no Q r2 yes no Zu Enter L for Low yes Is secondary Enter H for High Is secondary Error Select action forwa
173. to which this auxiliary input is connected Auxiliary Inputs can be used to enter miscellaneous variables Auxiliary Input 1 Tag Enter the 8 character tag name used to identify this transducer on the LCD display Auxiliary Input Type Enter the Auxiliary Input Type 0 DINRTD 1 American RTD 2 Honeywell Smart Transmitter or 4 20mA PL Auxiliary Input 2 I O Point Auxiliary Input 2 Tag Auxiliary Input Type PL Auxiliary Input 3 UO Point Auxiliary Input 3 Tag Auxiliary Input Type PL Auxiliary Input 4 UO Point Auxiliary Input 4 Tag Auxiliary Input Type Dm 50 2327 0003 Rev B Omni 2 13 Chapter 2 2 14 Flow Computer Configuration 2 5 7 Meter Run I O Assignments Config Meter Runs Physical I O information for up to 4 meter runs can be entered Transducers that are not assigned an I O point will not be available for display or further configuration INFO The number of process variable I O points available depends on the number of combo modules installed see Chapter 2 in Volume 1 for more information Point numbers range from 01 through 24 Assign 0 to invalidate the assigning of a variable VO Type Mismatch The computer will not let you assign the same I O point to incompatible transducer types Le an I O point cannot be assigned as a temperature input for Meter Run 1 and a pressure input for Meter Run 2 If the CO Type Mismatch message is displayed recheck the I O Share
174. tometers and gravitometers e Sarasota e UGC e Solartron Sarasota Density kg m Sarasota density is calculated using the frequency signal produced by a Sarasota densitometer and applying temperature and pressure corrections as shown below E 2D te 7 1 K t t i t 2x to Where Dc corrected density DCF Density correction factor Do calibration constant in mass volume Q NOTE D must be expressed in kilograms per cubic meter kg m t densitometer oscillation period in microseconds usec to calibration constant in microseconds to Tcoef X Tf Tcal Poet x Pt Peal to K spool calibration constant Ir flowing temperature in C Tcoef temperature coefficient in usec C Dr flowing pressure in kPa Pooef pressure coefficient in usec kPa Pcal calibration pressure in kPa Ei Womni 5 17 Chapter 5 Flow Equations and Algorithms for S I Metric Units Revision 2774 75 UGC Density kg m UGC density is calculated using the frequency signal produced by a UGC densitometer and applying temperature and pressure corrections as shown below UNCORRECTED DENSITY D K K xt K xt Where D uncorrected density in kg m Ko K calibration constants of density probe entered via the keypad Ko t densitometer oscillation time period in microseconds usec CORRECTED DENSITY en ie D K D K x P pl i K D K D K x T T D
175. tored as percentage of full scale with a resolution of 0 1 i e 0 to 1000 0 to 100 0 Run Switch Operating Mode In multi meter run systems the flow computer can be configured to automatically open and close meter run block valves depending upon orifice differential pressure Enter Y to select Automatic mode if you have a multi run system and wish to have the flow computer control the MOV block valves Enter N to select Manual mode if you wish to operate the valves via the keypad of the flow computer manually or via a Modbus link Ignore this entry if you do not have MOVs which are controlled by the flow computer Run Switch Delay Timer Enter the amount of time in seconds that you want the flow computer to allow for each meter run block valve to open and flow rate to be established If after this amount of time differential reassure or flow rate has not been detected the meter run block valve will be given the close command and the meter run alarmed as being out of service The flow computer will not attempt to open a meter run which is out of service until it is placed back in service either via the flow computer keypad or via a Modbus command Run Switch Threshold Low Differential Pressure A meter run will be closed when the differential pressure across the orifice falls below this threshold percentage of its maximum range Orifice runs are closed starting from the highest meter run number to the lowest The last meter run
176. trigger some type of an event based on the value of a calculated variable Boolean variables used in the Boolean expressions and described in the previous text can have only one of two values ON or OFF TRUE or FALSE How can the floating point numbers described in this chapter be used in a Boolean expression Simply using the fact that a variable can be either positive TRUE or negative FALSE Any variable or floating point can be used in a Boolean expression Example Provide an alarm and snapshot report which will occur when the absolute difference in net flow rate between Meter Runs 1 and 2 exceeds 10 bbls hr but only when Meter Run 1 flow rate is greater than 1000 bbls hr Result can be positive or i negative PROG VARIABLE 70xx 30 7102 7202 31 7030 10 32 7102 1000 Absolute flow difference minus 10 Positive if flow rate is greater than 1000 Variable 7031 will be positive TRUE if Meter Runs 1 and 2 flow rates differ by more than 10 bbls hr Variable 7032 will be positive TRUE when Meter Run 1 flow rate exceeds 1000 bbls hr User variables 7031 and 7032 shown above must both be positive for the alarm to be set In addition we will require that the condition must exist for 5 minutes to minimize spurious alarms The alarm will be activated by Physical I O Point 02 and we will use Boolean statements 1025 and 1026 Enter the following Boolean statements 1025 and 1026 used as example o
177. umber of Runs Enter the maximum number of runs that will be attempted to achieve a complete prove sequence This number must be between 2 and 99 L2 Master Meter Prover Type Comparison Enter 0 or 1 to select the Master Meter Proving Comparison 0 Mass Volume 1 Net Volume L1 Prover Volume The Master Meter Method enter the minimum volume that must flow through the master meter Meter 4 for each prove run L2 Inactivity Timer Enter the time in seconds before the prove is aborted due to prover inactivity Master Meter Method allow enough time for the amount of flow to pass through the master meter at the lowest expected flow rate L2 Stability Check Sample Time Enter the Stability Check Sample Time in seconds used to calculate the rate of change of temperature and flow rate at the prover or master meter The prove sequence will not start until the temperature and flow rate are stable L2 Sample Time Temperature Change ATemp Enter the temperature change allowed during the stability sample time see previous entry The change in temperature per sample period must be less than this value for the temperature to be considered stable enough to start a prove l a Omni 2 75 Chapter 2 2 76 Flow Computer Configuration L2 Sample Time Flow Rate Change AFlow Enter the change in flow rate allowed during the stability sample time see previous two entries The change in flow rate per sample period must be l
178. uration 2 2 5 Passwords Y INFO Most entry groups occupy multiple screens so be sure to use the MI 4 to scroll and see all data Except when changing transducer high low alarm limits a password is usually asked for when changing the configuration data within the computer The flow computer has independent password protection of the following Local Keypad Access Modbus Port 1 selectable Physical Serial Port 1 Modbus Port 2 Physical Serial Port 2 Modbus Port 3 Physical Serial Port 3 Modbus Port 4 Physical Serial Port 4 Local Keypad Access Three password levels are provided e Privileged Level e Level 1 2 4 Level 1A Level 2 Allows complete access to all entries within the flow computer including keypad passwords 1 1A and 2 below The initial privileged password for each Modbus port is selected via this password level This level allows technician access to most entries within the flow computer with the exception of I O Points assignments programmable variables and Boolean statements and passwords other than Keypad Level 1 This level allows technician access to the following entries only e Meter Factors e K Factors e Densitometer Correction Factors Pycnometer Factor Allows access to the operator type entries These entries include Transducer Manual Overrides e Product Gravity Overrides Prove Operations e Batching Operations EI Omni 50 2327 0
179. uring flowing density on this metering run and you wish to use this density value to calculate mass and volume flow rate Enter N to cause the flow computer to use the appropriate equation of state ISO 5167 Selection Rev 2774 Heating Value and ISO5167 selection both use this help menu For Heating Value select O AGA5 1 GPA2172 96 2 ISO6976 95 For ISO5167 enter O ISO5167 1991 E 1 ISO5167 1998 E 2 ISO5167 2003 E Dm 50 2327 0003 Rev B Omni 2 67 Chapter 2 2 68 Flow Computer Configuration 2 17 Configuring Miscellaneous Factors Program Mode In the Display Mode press the Prog key The Program LED will glow green and the Select Group Entry screen will appear Then press Factor Enter or Factor Meter n Enter or Meter n Factor n Meter Run 1 2 3 or 4 Use 4 keys to scroll Q Factor Setup via the Random Access Method Setup entries require that you be in the 2 17 1 Accessing the Factor Setup Submenu Applying the Menu Selection Method in the Select Group Entry screen Program Mode press Setup Enter and a menu similar to the following will be displayed SETUP MENU Station Setup Meter Run Setup Factor Setup Use the IM up down arrow keys to move the cursor to Factor Setup and press Enter to access the submenu 2 17 2 Factor Settings L1 Kg m to Lb ft This entry applies to Revision 23 US units only Enter the multiplie
180. use the faster Random Access Method see 2 2 4 this chapter Y INFO Characters in refer to key presses A INFO The first menu Misc Configuration should always be completed first as these entries specify the number and type of input and output devices connected to the flow computer You are advise to complete all entries under this menu before proceeding Only transducers that have been assigned to physical I O points will be available for further configuration Le the menus following the Misc Configuration menu do not ask for or accept configuration data unless a transducer has been defined See 2 5 2 this chapter The OMNI Flow Computer can accept many I O modules and be configured to match just about any combination of measurement transmitters Configuring the physical I O means setting up the number of meter runs what types of transducers are to be used and to which physical I O points they are connected l Y Omni 2 7 Chapter 2 Flow Computer Configuration 2 5 1 Miscellaneous I O Configuration Misc Setup Menu The physical I O configuration of the flow computer is changed by entering the Misc Setup menu while the Select Group Entry screen is displayed see 9 2 1 Entering the Program Mode Press Keys to Select Group Entry or Press Prog to Exit Setup Press Setup then Enter and the following selection menu will be displayed SETUP MENU Misc Configuration
181. used in the differential pressure flowmeter equations to calculate the flow rate It relates the velocity of the flowing fluid in the flowmeter approach section upstream meter tube to the fluid velocity in the orifice plate nozzle or Venturi tube The velocity of approach factor is defined by the following expression AE 1 lef Where Ey velocity of approach factor B diameter beta ratio see 4 1 6 this chapter Chapter 4 4 6 Flow Equations and Algorithms for U S Customary Units Revision 2374 75 4 1 8 Discharge Coefficients C Q Dimensionless Values The calculated coefficient of discharge is dimensionless however consistent units must be used The equations for the coefficient of discharge Cd have been determined from test data and correlated as a function of the diameter ratio B the meter tube diameter D and the pipe Reynolds number Rp It is used in the flow rate equations Coefficient of Discharge for Orifice Flowmeters With Flange Taps RG Equation Cq FT The Reader Harris Gallager RG equation for concentric square edged flange tapped orifice flowmeter coefficient of discharge Ca FT is a function of the orifice geometry and of a specified pipe Reynolds number and is defined as follows 10 B 0 7 C FT 0 000511 Ka Ca FT EE 0 8 10 0 35 0 0210 0 0049 24 x b Fi Rp Rp Where Ca FT coefficient of discharge at a specified pipe Reynolds number for fla
182. usually read only and must always be retrieved as a packet When Modicon 984 is selected these packet setup entries are used to define a logical array of variables which can be read or written in any grouping The number of data points is always input in terms of OMNI logical elements i e an IEEE floating point number comprises two 16 bit words but is considered one logical element Custom Modbus Data Packets are provided to reduce the number of polls needed to read multiple variables which may be in different areas of the database Groups of data points of any type of data can be concatenated into one packet by entering each data group starting index numbers 001 201 and 401 The number of data bytes in a custom packet in non Modicon compatible mode cannot exceed 250 RTU mode or 500 ASCII mode When Modicon compatible is selected the number of data bytes in a custom packet cannot exceed 400 RTU mode or 800 ASCII mode Enter 1 2 or 3 to select a data packet at Custom Packet n of the Misc Setup menu to open the entries below Under Index enter the database address or Modbus index number for each start data point of each group Under Points enter the number of consecutive data points to include in each data group Custom Modbus Data Packet 1 Addressed at 001 L1 Index Points Index Points Index Points Index Points 1 2 3 4 5 6 7 8 9
183. v B Configuration and Advanced Operation 2 2 4 Random Access Method In addition to the Setup Menu the data is also presented in related groups such as Temperature Pressure Meter etc You press the group key of your choice to get to a data area By specifying a meter run before or after a group you go directly to the data for that group and that group only Once a group is selected use the Up Down arrow keys to step to a specific data entry within the group You can view data and assuming a valid password has been entered change its value as required If an error is made press Clear re enter the correct data and press Enter to enter the new value The cursor will automatically step to the next data item in that group unless that would cause a total change of screen e you can always verify your entry A list of data groups and associated key presses is listed later in this chapter Example Pressing Temp will allow you access to temperature data for all meter runs Pressing Meter 1 Temp or Temp Meter 1 will allow access to only Meter Run 1 temperature data For example pressing Meter 1 Temp will display the following until the Enter key is pressed Press Keys to Select Group Entry or Press Prog to Exit Meter 1 Temp Pressing the Enter key will display a screen similar to this TEMPERATURE 1 Deg F Low Limit 30 0 High Limit 125 0 Override 60 0 Chapter 2 Flow Computer Config
184. ver use override code Always use override code Use override code on transmitter failure On transmitter failures use last hour s average On transmitter failure use station transducer value 5 On transmitter failure use absolute value of override SG API of the running product L1 Value at 4mA These entries apply if an analog gravitometer or densitometer is specified during the Config Meter Bun in Misc Setup Engineering units that the transmitter outputs at 4mA or 1volt or LRV of Honeywell Smart Transmitters 1 2 3 4 These entries apply if an analog gravitometer or densitometer is specified during the Config Meter Run in Misc Setup Engineering units that the transmitter outputs at 20mA or 5 Volts or URV of Honeywell Smart Transmitters Station Meter 1 Meter 2 Meter 3 Meter 4 L1A Factor A This entry applies if an analog 4 20mA density linear or a digital densitometer is specified during the Config Meter Run in Misc Setup It is not available when using specific gravity gravitometers Enter the Pycnometer Density correction factor Limit 0 8 to 1 2 Usually very close to 1 0000 Omni 50 2327 0003 Rev B Volume 3 Configuration and Advanced Operation Digital Densitometer Factors The following additional entries are required if a digital densitometer is specified during the Config Meter Run in the Misc Getup menu There are three selections which refer to digital densitometers 4 S
185. w green and the Select Group Entry screen will appear Then press Analysis Enter or Analysis Setup Enter and use Lat VW keys to scroll Q Analyzer Setup via the Random Access Method Setup entries require that you be in 2 8 1 Accessing the Analyzer Setup Submenu Applying the Menu Selection Method in the Select Group Entry screen Program Mode press Setup Enter and a menu similar to the following will be displayed SETUP MENU Time Date Setup Printer Setup Analyser Setup Use the THAI up down arrow keys to move the cursor to Analyzer Setup and press Enter to access the submenu 2 8 2 Analyzer Settings GC Analyzer No Enter the identifying number of the Applied Automation or Daniels Danalyzer gas chromatograph This is the serial communication ID number of the analyzer GC Analyzer 2 No Enter the identifying number of the second Gas Chromatograph GC Analyzer Type Enter the gas analyzer type 0 Applied Automation 1 Danalyzer The OMNI flow computer can communicate and retrieve analysis data from either an Applied Automation or a Daniels Danalyzer chromatograph In both cases the flow computer uses the 3rd serial port for communications When talking to an Applied Automation the flow computer uses the AA proprietary HCI A protocol interface When talking to a Danalyzer Modbus ASCII or RTU is used Results Interval Seconds Enter the maximum number of seconds that
186. w computer are derived from the fundamental equation which expresses the characteristic function y known as the Helmholtz free energy in terms of the independent variables density p and temperature T This fundamental equation from which water density is derived has been obtained from Joseph H Keenan Frederick G Keyes et al Steam Tables Thermodynamic Properties of Water Including Vapor Liquid and Solid Phases John Wiley amp Sons 1969 page 134 4 4 4 NBS Density Ib CF Viscosity Isentropic Exponent Sound Velocity and Enthalpy The NBS Technical Note 1048 Issued July 1982 is used to calculate density UP absolute viscosity C P isentropic exponent sound velocity and enthalpy BTU Ib for the following gases Argon Nitrogen Oxygen Hydrogen Ethylene Ei Omni 4 19 Chapter 4 Flow Equations and Algorithms for U S Customary Units Revision 2374 75 4 4 5 Density and Relative Density Specific Gravity Calculated from Digital Densitometer and Gravitometer Output Frequency Q Density and Specific Gravity Values Determined from Densitometer and Gravitometer Frequency Signals The equations used to determine the density and specific gravity via gas density and specific gravity transducers are provided by the respective manufacturers The calculations expressed in this section are performed by the OMNI to determine the density from frequency signals received from the following third party densitomete
187. ware Communications Package A Man Machine Interface package for the OMNI Flow Computer is also available as an option Detailed Daily Report A Detailed Daily report has been added for the user to select The computer stores 35 days configuration data of each meter run for this report The data includes low flow cutoff viscosity isentropic expansion factor pipe diameter at reference temperature orifice diameter at reference temperature density of air base temperature base pressure atmospheric pressure and the daily average of water content See under Password Maintenance for associated entry To print the report Press Prog Print Enter and scroll down to the entry which must be activated under the Password Menu screen to display Meter Detail Report and enter the meter number to print the report Maintenance Mode Totalizer Maintenance Mode has been added to firmware 23 74 30 and 27 74 30 For additional help see technical bulletin 52 0000 0010 TB980701 HART Protocol Firmware version 23 27 75 can now accept HART enabled devices Differental Pressure Temperature or Pressure transmitters communication The user can now configure the HART enabled devices thru the use of a new I O module which can be setup as a HT or HM module See Technical Bulletin 52 0000 0019 TBO90003 for additional information Chapter 1 Overview of Firmware Revisions 23 74 27 74 This page left intentionally blank Ei 1 6
188. x Points Index Points Index Points 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Custom Modbus Data Packet 2 Addressed at 201 L1 Index Points 1 2 Index Points Index Points 3 Index Points 4 5 6 7 8 Custom Modbus Data Packet 3 Addressed at 401 L1 Index Points Index Points Index Points Index Points 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 2 33 Chapter 2 Flow Computer Configuration 2 5 17 Programmable Logic Controller Setup Note See Technical Bulletin 52 0000 0004 TB 960702 Communicating with Allen Bradley Programmable Logic Controllers in Volume 5 for information on the PLC Group n submenu 2 5 18 Archive File Setup Note See Technical Bulletin 52 0000 0002 TB 960703 Storing Archive Data within the Flow Computer in Volume 5 for information on the Archive File n submenu 2 34 Omni 50 2327 0003 Rev B Volume 3 50 2327 0003 Rev B Configuration and Advanced Operation 2 5 19 Peer to Peer Communications Settings Q TIP For maximum efficiency always start Modbus ID numbers from 1 Serial Port 2 of the flow computer can be configured to act as a simple Modbus slave po
189. xponent dZ dT Molecular weight and Cmp will be calculated and can be viewed on the computer front panel display with the key press Temp Factor Meter N Enter Omni 50 2327 0003 Rev B Volume 3 2 19 50 2327 0003 Rev B Configuration and Advanced Operation Configuring Prover Program Mode In the Display Mode press the Prog key The Program LED will glow green and the Select Group Entry screen will appear Then press Prove Setup Enter and use N VW keys to scroll Q Prover Setup via the Random Access Method Setup entries require that you be in the 2 19 1 Accessing the Prover Setup Submenu Applying the Menu Selection Method in the Select Group Entry screen Program Mode press Setup Enter and a menu similar to the following will be displayed SETUP MENU Pressure Setup DP Inches of Water Prover Setup Use the MN V up down arrow keys to move the cursor to Prover Setup and press Enter to access the submenu 2 19 2 Prover Settings L2 Enable Prove Y N Enter a Y to enable the prover data to be entered Computer default is N NOTE If archiving RAM has be setup to run this selection will not be allow to be run To run a prove Archiving must be disabled L2 Number of Runs to Average Enter the number of consecutive runs required to be considered a complete prove sequence This number must be between 2 and 10 L2 Maximum N
190. y at 0 C 0 101325 MPa CO Ruwe O O oo O Mole Nitrogen Mole Ethane Mole Butanes Method 1 Utilizes the volumetric gross heating value HV relative density mole fraction COs Method 2 Utilizes Relative Density mole fraction N2 mole fraction COs Ei Womni 4 17 Chapter 4 Flow Equations and Algorithms for U S Customary Units Revision 2374 75 AGA Report N 8 1985 EDITION Six methods of characterization of a gas mixture from the AGA 8 1985 edition are available for use on the OMNI Flow Computers the primary method and five alternate methods Primary Characterization Method The primary method is the most accurate method in this AGA 8 version for characterization of natural gas for computations using the equation of state for compressibility factor This method consists of a complete compositional analysis the mole fractions of all components of a natural gas mixture Alternate Characterization Methods An alternate characterization method is used when a complete compositional analysis for a natural gas is not available One of the five alternate methods can be used to estimate the mole fractions of methane and other important hydrocarbons in the natural gas as well as diluents other than carbon dioxide and nitrogen These characterization methods do not include water vapor or hydrogen components Various combinations of the following quantities are utilized e Real Gas Relative Density Specifi
191. y of Mechanical Engineers Measurement of Fluid Flow in Pipes Using Orifice Nozzle and Venturi ASME MFC 3M 4 1 1 Mass Flow Rate at Flowing Conditions Q KIbm hr Q Cx EV x Y x 4x d2x 2xAPx Pf x 3600 1000 4 1 2 Volumetric Gross Flow Rate at Flowing Conditions 50 2327 0003 Rev B Qy MCF hr Chapter 4 Flow Equations and Algorithms for U S Customary Units Revision 2374 75 4 1 3 Volumetric Net Flow Rate at Base Conditions Or MSCF hr Q Qu Ps 4 1 4 Energy Flow Rate at Base Conditions Q MMBTU hr Q Q a ae 4 1 5 Nomenclature The following symbols are used in the flow rate equations Some of these require further elaboration or calculation which can be found in the indicated standards Qm mass flow rate at flowing actual conditions for gas differential pressure flowmeters in thousands of pounds mass per hour Klbm hr Qy volume gross flow rate at flowing actual conditions for gas differential pressure flowmeters in thousands of cubic feet per hour MCF hr Qp volume net flow rate at base standard reference conditions for gas differential pressure flowmeters in thousands of standard cubic feet per hour MSCF hr Qe energy flow rate at base standard reference conditions for gas differential pressure flowmeters in millions of British thermal units per hour MMBTU hr C coefficient of discharge dimensionless see 4 1 8 this chapter Ey velocity
192. y type analog specific gravity analog density digital Solartron pulse digital Sarasota pulse or digital UGC pulse the maximum number that can be connected is four Gas Chromatographs Where applicable analysis data can be obtained automatically via a_ serial communication port from a gas chromatograph Standard protocols communicate with 1 Applied Automation analyzers 2 Daniels Danalyzer 3 other analyzers which communicate using Modbus protocol It is now possible to read two independent Gas Chromatographs streams via the third serial port Station Capability Meter runs may be combined or subtracted in any mode to provide station flow rates and totalizers Can be used in Check Pay meter systems to monitor flows and alarm if deviations exceed a preset limit Gas Products Information Stored Product Information for four different gases can be stored Product setup information includes name type of gas component analysis relative density at reference conditions and calculation algorithm to be used when running the product Type of Gases Measured Natural gas and other fluids covered by AGA 3 1992 API 14 3 AGA 8 Reports 1994 1992 and 1985 ASTM Steam NIST Steam Water Argon Nitrogen Oxygen paraHydrogen and Ethylene using NIST 1048 Omni 50 2327 0003 Rev B Volume 3 1 10 1 11 1 12 1 13 1 14 1 15 1 16 50 2327 0003 Rev B Configuration and Advanced Operation
193. your application are listed at the end of each version of this volume Ei YY Omni xi xii OMNI 6000 OMNI 3000 User Manual For Your Information Volume 3 Configuration and Advanced Operation Volume 3 is intended for the advanced user It refers to application specific topics and is available in four separate versions one for each application revision This volume covers Application overview Flow computer configuration data entry User programmable functions Modbus Protocol implementation Flow equations and algorithms Volume 4 Modbus Database Addresses and Index Numbers Volume 4 is intended for the system programmer advanced user It comprises a descriptive list of database point assignments in numerical order within our firmware This volume is application specific for which there is one version per application revision Volume 5 Technical Bulletins compendium of Technical bulletins You can view and print technical bulletins from Manual Updates and Technical Bulletins Volume 5 of the User Manual is a our website http www omniflow com Volume 5 includes technical bulletins that contain important complementary information about your flow computer hardware and software Each bulletin covers a topic that may be generic to all applications or specific to a particular revision They include product updates theoretical descriptions technical specifications procedures and other inform
194. z AGA 8 1985 HV SG N2 COz amp SG N2 COz amp HV N2 CO gt 2 AGA 8 1985 SG CO2 C INFO AGA 8 can also be used for many other gas mixtures including carbon dioxide 8 The following entries apply to AGA 8 1985 calculation methods and represent component mole percentage overrides Enter the mole percentages of each component of the gas stream These percentages are used to calculate the flowing density and heating value if the application does not have a gas chromatograph GC analyzer or the GC fails This data may be overwritten by data received from the GC All entries apply for the detailed analysis method Component Mole Override Prod 1 Prod 2 Prod 3 Prod 4 4 01 Nitrogen N3 02 Carbon Dioxide CO2 03 Hydrogen Sulfide H2S 04 Water H20 05 Helium He A 06 Methane CH 07 Ethane C2H6 08 Propane C3Hs 09 i Butane iC 4H10 10 n Butane nC Hal 11 i Pentane CH 12 n Pentane nC5H 2 21 Neo Pentane neoC H 2 13 n Hexane CH 14 n Heptane C7H 15 n Octane CH6 16 n Nonane 17 n Decane 18 Oxygen 02 a 19 Carbon Monoxide CO 20 Hydrogen H3 Total Prod 1 Prod 2 Prod 3 Prod 4 Enable AGA10 Y N AGA10 Variables will be calculated if the Density method selected as AGA8 1994 Detail method and AGA10 is enabled by selecting Yes as shown above AGA10 variables Velocity of Sound Cp Cv Cp Cv Isentropic E

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