355 precision absolute manometer operating instructions
Contents
1. Second line of the display reads U 685 FEET To set the unit to read in meters select METERS from the UNITS SELECT menu Then follow the same steps as outlined on pages 10 and 11 Because the local barometer changes all the time the USER MODE altitude must be reentered each time the 355 is to be used in this mode To adjust the unit to the current barometric pressure without changing the base altitude select NO page 11 step 6 by pressing the PRGM key The 355 will now display the current altitude To maximize accuracy the local altitude should be reset whenever better altitude information is available 12 PRESSURE CorRECTED TO SEA LEVEL Pressure reduction to Sea Level is required so that baro metric readings can be compared at different elevations The correction to sea level is done using a hypsometric equation This equation simulates a fictitous column of air which extends downward from the instruments loca tion to sea level This fictitous column is assumed to be similar to the actual air column over nearby lower eleva tions Some properties are related to observed conditions while others must be assumed Barometric pressures given by the National Weather Service and used at airports are always corrected to to sea level To set the unit to display pressure corrected to sea level Keystrokes Display 1 Determine the elevation of the instrument above sea level in meters 700 meters will b2. KEYPAD FUNCTIONS ON OFF amp BACKSPACE KEY Turns the manometer on into the Measure Mode and then turns the unit off from the Measure Mode Also serves as a backspace key when editing in the Program Mode The backspace function takes the user out of a programmable register without changing the previous setting Pressing this key repeatedly will return the user to the Measure Mode and then shut off the manometer MIN MAX amp UP ARROW KEY In the Measure Mode activates the Min Max function of the manometer When activated the the minimum value is displayed on the upper left of the display and the maximum value on the upper right Min Max values on the display are updated every 0 1 seconds This key also deactivates this function Up arrow key is used to scroll through the programmable registers when the unit is in the Program Mode Once a programmable register is selected the up arrow can be used to edit that register TARE amp DOWN ARROW KEY In the Measure Mode activates and deactivates the display TARE function The Tare function is designed to set the displayed value to 0 With TARE activated the letter T appears in the lower left of the display Down arrow function is used to scroll through programmable registers with the unit in the Program Mode Once a programmable register is selected the down arrow can be used to edit that register PRGM amp ENTER KEY Puts the manometer into the Program
3. S 803 1 TORR 14 Damp Rate SELECT Adjustable damping is available to steady the display when measuring pulsating pressure or flow The Smart Manometer has a range of damping rates of 0 1 0 2 0 5 1 2 5 10 and 25 seconds Damping is done by averaging new data from the pressure sensor against previously collected data The microprocessor collects data from the sensor every 0 1 seconds The display updates every 0 5 seconds showing the current 0 1 second pressure reading When set at 25 seconds the display updates every 0 5 seconds with the average of the previous 25 seconds readings Therefore it takes up to 25 seconds from the time pressure is applied until the manometer displays the full scale applied pressure Min Max display updates every 0 1 seconds To set the damp rate Keystroke Display 1 Follow steps on page 4 to PROGRAM MODE put the unit in Program UNITS SELECT Mode 2 Press the up arrow Bottom line reads key DAMP RATE SELECT 3 Press the PRGM key Top line reads DAMP RATE SELECT 4 Press the up or down Bottom line shows damp arrow keys until the rate in seconds desired damp rate is displayed on bottom line 5 Press the PRGM key PROGRAM MODE UNITS SELECT 6 Press the down arrow Bottom line reads EXIT key 7 Press the PRGM key Returns to Measure Mode 15 Auto SHUT OFF Enabling the Auto Shut Off feature allows the manometer to turn itself off after approxima
4. MANOMETER Periodically the 355 Smart Manometer should have a new zero taken This is done to remove zero drift that has occurred since the manometer was last zeroed The 355 provides three mechanisms for re zeroing 1 Referenced to Absolute Zero This traditional and preferred method takes a snapshot of the measured pressure when a vacuum of less than 100 microns Absolute is applied to the sensor 2 Factory Zero This method restores the calibra tion curve to the original zero taken at the fac tory Note that this feature is intended for comparison purposes and should not be used for real pressure measurement as any zero drift will not be compensated 3 User Adjusted Zero This method allows the user to enter any pressure value when a known reference is applied for example the local barometer The manometer will compare its actual measured value with the entered value and calculate a new zero reference based on the offset 1 To zero the manometer with Referenced to Absolute Zero starting with the unit turned off follow this keystroke sequence 1 Press ON OF button Connect the 355 to a vacuum source capable of a vac uum of 100 microns absolute pressure or less Pull a full vacuum Press MIN MAX and TARE keys at the same time See figure 1 Press the PRGM key The display briefly shows the header name and full scale range of the unit in the last engineering units se lected The ma
5. Note that the User Adjusted Zero feature will not accept entries in altitude units FEET or METERS When the current engineering unit is FEET the User Adjusted Zero function will automatically prompt for an entry in Inches of Mercury When the current engineering unit is ME TERS the User Adjusted Zero function will automatically prompt for an entry in Millimeters of Mercury PRoGRAM MopE The Program Mode is used to configure the manometer for Measure Mode operation The configurable registers that are found in the Program Mode are Units Select Damp Rate Select User Info Select Contrast Select Sea Level Select and Exit The manometer can be put into the Program Mode at any time during Measure Mode operation by pressing the PRGM key The top line of the display will read PROGRAM MODE The bottom line will read UNITS SELECT Press the up or down arrow keys to scroll through the Program Mode to the desired register Units SELECT The standard engineering units available on the Smart Manometer are Inches of Mercury at 0 Celsius Millimeters of Mercury at 0 Celsius PSI Millibars Bars Kilo Pascals Torrs Feet altitude see page 5 Meters altitude see page 5 r aN i eO To change engineering unit of measure the manometer should be ON and in the Measure Mode Then follow these steps Keystroke Display 1 Press PRGM key PROGRAM MODE UNITS SELECT 2 Press PRGM key UNITS SELECT bottom
6. keys at the same time See figure 1 Press up or down 4 arrow key until de sired zero function is shown on the bottom line Press the PRGM key Press any of up or down J arrow key or the PRGM key to begin editing Example set current pressure value to 29 5 InHg Top line of display reads ZEROING SOURCE Bottom line of display reads REF TO ABS ZERO Bottom line of display reads USER ADJ ZERO Top line of display shows the current non zero com pensated pressure value Bottom line of display shows the same value along with the engineering unit Top line of display contin uously updates Bottom line of display data is frozen and the first digit is blinking 6 Press the UPT or Current XXX XX DOWN arrow key Oxx xx INHG to set the first digit to 0 Using the UPT arrow key the character sequence is 0 9 negative decimal point The sign is used if your location is below sea level 7 When the digit is Cursor flashes to the right correct press the of 0 PRGM key If an error is made use the back space lt key to move the cur sor back to the incor rect digit Press the UP or DOWN 4 arrow keys to display the correct value 8 Continue this process Current xxx xx until the display 029 50 INHG reads as shown at right 9 Press the PRGM key Zeroing is complete when to enter the final unit returns to Measure digit Mode
7. line reads EXIT Returns to Measure Mode 19 CONNECTING THE PRESSURE SOURCE The 355 Precision Absolute Manometer comes with a 316ss 1 8 FNPT pressure port The manometer should be held firmly in one hand while a small wrench is used to tighten the 1 8 MNPT connection into the manometers pressure port DO NOT USE the large nut holding the pressure connection in the bulkhead in the manometer to hold the manometer while the pressure connection is in stalled If the bulkhead nut is loosened it is possible for the sensor and sensor board to turn inside the manometer body This can damage the sensor board CHANGING THE BATTERY The manometer is powered by one 9 volt battery When the output of the battery under load drops below 6 5 volts the display will alternate between LOW POWER DETECT and REPLACE BATTERY To replace the battery locate the battery compartment in the bottom rear of the manometer Push down on the small rectangular area in the battery cover While pushing the cover down slide the cover out the bottom of the unit Pull the battery connector off the battery terminals Plug the new battery into the connector and install in the compartment Slide the battery cover on until the locking clip goes into the manometer housing and the channels on the bottom of the cover are locked in place 20 RECALIBRATION The Smart Manometer s accuracy can be verified by using a 0 015 of reading abso
8. shows current engineering units 3 Press up or down arrow key until desired engineering unit is displayed 4 Press the PRGM key to select engineering unit 5 Press the down arrow key 6 Press PRGM key Engineering units on bottom line of display change PROGRAM MODE UNITS SELECT PROGRAM MODE EXIT Display returns to Measure Mode in new engineering units DISPLAYING ALTITUDE The model 355 is capable of displaying altitude in feet or meters The operator can chose between displaying altitude based on U S Standard Atmosphere of 1962 tables or an altitude entered by the user The user defined altitude can be taken from maps or survey trig markers To set the altitude based on U S Standard of 1962 use the following steps Keystroke 1 In the Measure Mode press the PRGM key 2 Press PRGM key 3 Press the UP tor DOWN Harrow key until the second line of the display reads FEET or METERS 4 Press the PRGM key Display PROGRAM MODE UNITS SELECT UNITS SELECT current engineering units on the bottom line UNITS SELECT bottom line reads FEET or METERS ALTITUDE SELECT STANDARD 10 5 Press the PRGM key to display altitude based on the U S Standard Atmosphere of 1962 PROGRAM MODE UNITS SELECT If the U S Standard Atmosphere tables are desired press ing the Backspace key at this point returns the unit to the
9. the Header is the Full Scale of the manometer in the last engineering units programmed The factory setting of the header is MERIAM INSTR This can be edited to show a custom alpha numeric string as required by the user To configure the Unit Info Select register follow the keystrokes listed below Keystroke Display 1 From the Measure PROGRAM MODE Mode press the PRGM UNITS SELECT key 2 Press the up arrow key Bottom line changes to two times USER INFO SELECT 3 Press the PRGM key Bottom line shows serial number 4 Press the PRGM key Software version number shown 5 Press the PRGM key Calibration Date shown 6 Press the PRGM key AUTO SHUT OFF ENTER TO SELECT 7 Instructions for setting HEADER NAME the AUTO SHUT OFF MERIAM INSTR are on page 16 Press up Tarrow key to proceed to editing the Header 17 If header is correct press backspace key If editing is desired proceed to step 11 Press up arrow key two times 10 Press the PRGM key 11 Press the up or down arrow keys to set correct alpha numeric value 12 Press right arrow gt to accept entry 13 Repeat steps 11 and 12 until the desired Header is shown 14 If an error is noted press the back arrow key until cursor is over the incorrect value Follow step 11 to correct Press the right gt arrow to advance the cursor without changing values 14 When header is complete press the P
10. File No 355 440 1 355 PRECISION ABSOLUTE MANOMETER OPERATING INSTRUCTIONS Meriam Instrument s 355 Precision Absolute Manometer is a microprocessor based pressure sensing device that can be used to directly measure absolute pressure Models are available to measure pressure ranges up to 900mm HgA and 2000mm HgA Pressure can be o displayed in a variety of J ae 6 engineering units All units include a Tare function a Min Max function selectable damp E MANOMETER rates and altitude displayed in PRECISION ABSOLUT Mi aame feet or meters The 355 can also display barometric pressure corrected to sea level TABLE OF CONTENTS Subject Page Keypad functions Zero Lockout Pressure zeroing the manometer Program mode Units select Displaying altitude Pressure corrected to Sea Level Damp rate select Auto shut off User info select Contrast select Connecting the pressure source Changing the battery Recalibration Specifications inside back cover
11. Measure Mode USER DEFINED ALTITUDE To display altitude based on user entered infor mation follow steps 3 on page 5 Skip step 4 and proceed to step 6 below 6 Press the UP f arrow keys to set altitude manually Press the PRGM key 8 If the value is the correct altitude press the PRGM key If the value is not the correct altitude press the UP t arrow key Press the PRGM key Example set altitude to 685 feet above sea level 10 Press the UPt or DOWN arrow key to set the first digit to 6 ALTITUDE SELECT REF TO USER VALUE 00000000 CHANGE NO PROGRAM MODE UNITS SELECT Press the backspace key to return to the Measure Mode VALUE 00000000 CHANGE YES USER MODE FEET 00000000 USER MODE FEET 60000000 11 Using the UPt arrow key the character sequence is 0 9 negative decimal point The sign is used if your location is below sea level 11 When the digit is correct press the PRGM key If an error is made use the back space key to move the cursor back to the incorrect digit Press the up or down arrow keys to display the correct value 12 Continue this process until the display reads as shown at right 13 Press the PRGM key to enter the final digit 14 Press the backspace key to return to the mea sure mode Cursor flashes to the right of 6 USER MODE FEET 685 0000 PROGRAM MODE UNITS SELECT
12. Mode a from the Measure Mode When in the Program Mode pressing this key selects the programmable register to be edited After the register has been edited pressing the PRGM key enters the new Setting into the manometer s non volatile memory This key also acts as a forward space gt key when editing user input such as the header name Zero Lockout Operating Instructions When enabled the zero lockout feature is designed to help prevent operators from inad vertently zeroing the unit during normal opera tion This feature is enabled when the 350 Smart Manometer leaves the factory To verify this press the ON OFF button on the key pad to turn the unit on After the initial headers are displayed the manometer should display a mes sage indicating that the Zero Lockout feature is enabled If this is not displayed the lockout feature is disabled and the manometer can be zeroed if the applied pressure is at 1 of Full Scale or less To enable or disable the lockout feature follow these steps 1 Start with the Smart Manometer off 2 Press and hold the PRGM key 3 While holding the PRGM key press the ON OFF key to turn the unit on 4 Release both keys 5 Ifthe lockout feature is enabled it will be disabled If it was disabled it will now be enabled The current status can be verified by turning the unit off then back on again A message will be displayed when the Zero Lockout feature is enabled PRESSURE ZEROING THE
13. RGM key to advance cursor to end of bottom line 15 Press the PRGM key 16 Press down arrow key 17 Press the PRGM key PROGRAM MODE USER INFO SELECT Bottom line reads EXIT Returns to Measure Mode Displays a number between 0 and 9 a letter from A to Z or a blank space Cursor advances one space to right Cursor flashes at bottom right PROGRAM MODE UNITS SELECT Bottom line reads EXIT Returns to Measure Mode 18 CONTRAST SELECT The Contrast Select register allows the user to adjust the character contrast of the LCD display to provide the best visibility for the ambient conditions If during the contrast adjustment an error is made pressing the backspace key returns the display to the previous contrast setting To adjust the contrast follow the keystrokes below Keystroke From the Measure Mode press the PRGM key 2 Press the up arrow key three times 3 Press the PRGM key 4 Press up or down arrow keys to increase or decrease the contrast value A low number gives maximum contrast and a high number gives minimum contrast 5 Press the PRGM key 6 Press down arrow key 7 Press the PRGM key Display PROGRAM MODE UNITS SELECT Bottom line reads CONTRAST SELECT Top line reads CONTRAST SELECT bottom line shows a numerical value LCD lightens or darkens depending on value set PROGRAM MODE UNITS SELECT Bottom
14. e used as an example 2 In the Measure Mode PROGRAM MODE press the PRGM key UNITS SELECT 3 Press the UP arrow key PROGRAM MODE four times SEA LEVEL SELECT 4 Press the PRGM key SEA LEVEL SELECT second line will read EN ABLED or DISABLED 5 Press the UP or Second line toggles between DOWN W arrow key to ENABLED and DIS set the correction to sea ABLED level status 6 To turn on the correction VALUE 00000000 set ENABLED on the CHANGE NO second line and press the PRGM key To turn it off set DISABLED on the line and go to step 12 13 7 To change the value press the UP arrow key to toggle the display 8 Press the PRGM key 9 Press the UP or DOWN arrow keys to set the cor rect value in the first digit 10 When the value is cor rect press the PRGM key 11 Repeat steps 9 and 10 until the correct elevation is entered 12 Press the PRGM key to continue moving the cur sor to the right When the last digit is entered the unit will leave the sea level select mode and return to the Program Mode 13 Press the backspace key The display will return to the Measure Mode If correction to sea level is enabled the display will have the letter S at the beginning of the second line VALUE CHANGE 00000000 YES SEA LEVEL METERS 00000000 SEA LEVEL METERS 70000000 Cursor moves over the next digit SEA LEVEL METERS 700 0000 PROGRAM MODE UNITS SELECT
15. lute deadweight tester It is recommended that the manometer be checked at a minimum of four test points at 25 50 75 and 100 of the units range A full ten point evaluation provides the most complete information on the manometers performance Before performing the evaluation there are several corrections to the deadweight tester that may have to be made 1 Use the User Unit Select option in Program Mode to match the Smart Manometer units to the deadweight tester units Be sure to match the Smart Manometer temperature reference to the temperature reference of the deadweight tester for in H O and Hg units only 2 Correct the deadweight tester readings for ambient temperature if it is different from the reference temperature The Smart Manometer does this automatically 3 The local gravity at location where the evaluation is being performed must be corrected for on the deadweight tester Standard gravity reference is 980 665 cm sec sec This gravity occurs at 45 north latitude at sea level 4 Make sure there are no leaks in the system The mm Hg absolute manometer references mercury at 0 C The effects of local gravity on the Smart Manometer are corrected for by zeroing the manometer see pgs 3 amp 4 before the evaluation This evaluation will confirm whether the manometer is or is not operating within its accuracy specification 21 If the manometer is outside of it s accuracy limits it must be returned
16. nometer then goes into the Measure Mode where the applied pressure and engineering unit of measure are dis played Display should read close to zero See note on next page Top line of display reads ZEROING SOURCE Bottom line of display reads REF TO ABS ZERO Top line of display reads ZERO IN PROGRESS while bottom line counts down from 9 Zeroing is complete when unit returns to Measure Mode Note The 355 can be zeroed only if the new Zero is within 1 FS of the original factory calibration zero If outside this limit a ZERO RANGE ERROR message appears and the manometer will not zero 2 To zero the manometer with Factory Zero starting with the unit in normal measure mode follow this key stroke sequence Press MIN MAX and Top line of display reads TARE keys at the ZEROING SOURCE same time See Bottom line of display figure 1 reads REF TO ABS ZERO Press up or down 4 Bottom line of display arrow key until de reads FACTORY ZERO sired zero function is shown on the bottom line Press the PRGM key Zeroing is complete when unit returns to Measure Mode To zero the manometer with User Adjusted Zero starting with the unit in normal measure mode follow this key stroke sequence Apply a known ac curate pressure source This may be true atmospheric pressure with known reference defined by a local barometer Press MIN MAX and TARE
17. ss 1 Groups A B C and D
18. tely ten minutes of keypad inactivity Disabling this feature limits the manometer to being turned off by using the ON OFF key only Units are shipped from the factory with the Auto Shut Off enabled To configure the auto shut off follow the steps below Keystroke 1 In the Measure Mode press the PRGM key Press the up arrow key two times Press the PRGM key Press the PRGM key until the display reads as shown in the display column Press the PRGM key Press the up or down arrowkeyto toggle the Auto Shut Off status Press the PRGM key 8 If Header needs to be edited follow steps 11 17 on pages 18 9 If header is correct follow steps 8 10 on page 18 Display PROGRAM MODE UNITS SELECT PROGRAM MODE USER INFO SELECT SERIAL NUMBER XXXXXXXX XX AUTO SHUT OFF ENTER TO SELECT Bottom line reads ENABLED or DISABLED Auto Shut Off status on bottom line changes Top line reads HEADER NAME bottom line shows header Changes Header and returns to Measure Mode Returns to Measure Mode 16 USER INFo SELECT The User Info Select register is designed to provide the user with information on the hardware and software in the manometer This register stores information on the sensor s serial number software version date of last calibration Auto Shut Off status and the instrument Start Up Header The Start Up Header appears whenever the manometer is turned on Below
19. to the factory for recalibration The Smart Manometer cannot be recalibrated in the field If recalibration is required contact the Meriam Instrument representative in your area or call the factory at the numbers listed below for a Return Material Authorization RMA number Meriam Instrument 10920 Madison Ave Cleveland OH 44102 Ph 216 281 1100 FAX 216 281 0228 All Smart Manometers recalibrated at the factory are returned with certificates of NIST traceability 22 SPECIFICATIONS Sensor Type and Range AI2000 Absolute Isolated 2000 mm Hg AI0900 Absolute Isolated 900 mm Hg Accuracy 355 AI0900 0 02 F S F S 900 mm Hg 355 AI2000 0 015 F S from 0 1000 mm Hg 0 025 F S from 1000 2000 mm Hg F S 2000 mm Hg Absolute Includes the combined effects of temperature linearity repeatability hysteresis and resolution NIST certification supplied with manometer Temperature Storage 40 F to 140 F 40 C to 60 C Operating 4 F to 122 F 20 C to 50 C Media Compatibility Isolated sensors for all fluids compatible with 316SS Pressure Limits 4000 mm Hg Absolute AI0900 and AI2000 Connection 1 8 female NPT 316SS Power 9 volt battery lithium or alkaline field replaceable Lithium is recommended for operation below 32 F 0 C Display 5 significant digit LCD Enclosure 14 oz ABS plastic 6 5 x 3 6 x 2 25 CSA units Intrinsically safe for Cla
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