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Honeywell The Series 7020 Dissolved Oxygen Analyzer User Manual

1. 34 4 32 Program MOUUG bade cid sa Dope indi a E Lee esd EIS ea GPS REY RD EUR 35 EVER siio EBEN 5 cs nce Hc DF 35 Vai 35 Relays atic eset arta ual LE Ec eas qam 38 40 Analog Output Programming Procedure CAT features only 42 Analog Output Programming Procedure DAT features only eee 42 Bv T EE 43 Application Information usisain eee pinia pa aR TEARRE AREENA EET E dees wees uuu ue bd elites 45 Auto Calibrate CIeanaocd eena dide i Sa KEA Re ist DER reu ETE OE 47 Auxiliary eoe ice ontop E api Devis AEE 52 Selecting Dissolved Oxygen or Percent 54 Config ring 54 Progtamming Set p BUttONS proe as ud yet gea dys eon So dev Dacecess MALE AE 55 Password IRE 55 BLAN c E 57 Auto Ranging 7021 ppb Units Only y ai tte rte tere Erbe 58 4 3 3 Maintenance o ee eet a ede hn E RR a o tu ue dep OM c deu 59 LSU CUPIT DEINER OL TU Em 59 Mains FEequetieys atas mau atas cai enka chad ccs Uu E AD cn PEOR v Mn bead GoM toe
2. eee eene 3 Do s for 7931 Dissolved Oxygen iuda iiec eoi 3 Don ts for the 7931 Dissolved Oxygen Probe ed aoc haa 3 SPECIFICATIONS AND MODEL SELECTION GUIDE Tn 5 PENS Aea a Ler LEO EEEE oe ELLA eue a 5 rr PIE 5 Eh ry eee mee cr LED M een 5 Environmental siae tends Et 47 5 FRANSES 5 iv PN 5 Accuracy Statement Tor ihe LOOD ER ATE BRA 6 Standards C omplianck ise peti cues ENA E 6 2 2 Product Specifications aeos oed cr bel 6 ODSrator Interfdee 6 PUA BIOSIS ca pty see CE 6 Angaloe IBpuls Span lyn IER a Dash em ee Santee ue e dear SP eR NDS 6 PRA aacra oo a ien rec ame 7 Discrete INDUS c r v 7 Discrete QUIDUIS Qaae olo ea Saves tate ides ee dece dc cs su eid P s ME T Detault Factory Configuration anoun is este att dide EES 8 2 3 Model Selection E ac dba E E RE 9 Series 7020 Disso
3. 18 General PrOCeduEe rote boe qur RE pn RI ORTU REPE eed cee alee 19 Special Wiring Considerations Terminal Boards iuret oet E ERA 21 Special Wiring Considerations 22 Probe Noise Test E ETE A N enn 22 Llc qe A MMV 25 4 1 1 Button Functions eeepc a p E ds 26 4 1 2 Screen Movement erat o erts eee ea Mane 21 41 5 Setting Numerical oto rubet eor UE drea 27 2 14 Diagnostic MeSSaBE S Na eoru Ee EU en td teas i a ta E Red 28 4 2 Display De Tax ence des ots tfe 28 4 3 Main MU Siti edd ted deut ie ood s ascen da trabe e at 29 4 3 1 TE 29 Alartm Diagnostic SUMMary 29 Manual Calibration Units with Software Prior to Version 30 ooo diretto en His pristinae boob LED M Poaceae eg estou T E 30 Automatic Cleaning Calibration ud oo abrufen css nere ERRAT VE E UD 31 Review PLO CAN iva tissue E bind
4. From the PROGRAM LOOP screen l Press the Down Arrow until RESET is boxed Press the Enter button to select If OFF is displayed press the Up Arrow until zero is displayed Set the desired value as described in Section 4 1 2 we dx c To turn Reset off see below Setting the Loop Rate PID only From the PROGRAM LOOP screen l Press the Down Arrow until RATE is boxed 2 Press the Enter button to select 3 Setthe desired value as described in Section 4 1 2 4 To turn Rate off see below Setting the Set Point From the PROGRAM LOOP screen 1 Press the Down Arrow until SETPOINT is boxed 2 Press the Enter button to select 3 Setthe desired value as described in Section 4 1 2 4 To turn the Set Point off see below Setting the Hysteresis ON OFF only From the PROGRAM LOOP screen 1 Press the Down Arrow until HYSTERESIS is boxed The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Operation 2 Press the Enter button to select 3 Set the desired value as described in Section 4 1 2 4 To turn the Hysteresis off see below Turning GAIN RESET RATE SETPOINT or HYSTERESIS off To turn GAIN RESET RATE SETPOINT or HYSTERESIS off from the PROGRAM LOOP screen with the desired function boxed 1 Press the Enter button to select 2 Press the Up Arrow to increment the flashing digit until OFF is displayed 3 Press the Enter button to select It is necessary to follow these instruction
5. The equilibrium concentration of oxygen dissolved in a liquid is directly proportional to the partial pressure of oxygen in the vapor phase with which the solution is in contact Dry air which contains 20 9 oxygen will have an oxygen partial pressure of 159 mmHg if the total pressure is 760 mmHg Tables of oxygen solubility are normally referenced to this value An altitude or pressure correction must be made when conditions differ from this level The correction is made using the following equation S S P p 760 p where S is the solubility at barometric pressure of interest P S is the solubility at 760 mmHg at a given temperature P is the barometric pressure P is the partial pressure of water at the given temperature Temperature Honeywell dissolved oxygen probes and analyzers include temperature sensors and an automatic temperature compensation algorithm The algorithm takes the raw oxygen signal from the probe which is proportional to the partial pressure of oxygen and converts it into the actual concentration of oxygen at the measuring temperature The algorithm is based on the decreasing solubility of oxygen with increasing temperature and on the probe temperature coefficient Salinity 2 98 The significant effect of dissolved solids on reducing oxygen solubility is well documented However the partial pressure of oxygen raw oxygen probe signal is the same whether in pure or saline water Since the actual solub
6. From the MAIN MENU ONLINE screen press the Down Arrow button twice to select MANUAL CALIBRATION Press the Enter button to make the selection Press the Down Arrow button to box PRESSURE CALIBRATION Press the Enter button to make selection Adjust the value of mmHg digit by digit as described under Sample Calibration above until the displayed pressure in mmHg agrees with the known pressure Press the Enter button to indicate completion of the adjustment to the value The MANUAL CALIBRATION screen returns indicating completion of the pressure calibration Calibrate Analog Inputs CAUTION These calibrations are performed at the factory with NIST traceable precision test equipment Recalibration is unnecessary unless some problem has been detected or if components have been replaced The purpose of this calibration procedure is to allow calibration of the analog to digital converter ADC and the dissolved oxygen input ranges against external standards Equipment required includes a 5 0000 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual 63 The Series 7020 Dissolved Oxygen Analyzer User s Manual 64 0 02 or better DC voltage source and either a precision direct current source or a precision voltage source with precision resistors such that direct currents of 350 35 3 5 and 0 35 microamps 0 01 or better may be connected to the analyzer Calibrating the ADC consists of applying 5 volts between Unit
7. INPUT HI 10 00 INPUT LO 0 00 GAIN 1 00 Selecting the Control Loop type From this PROGRAM LOOP screen 1 Press the Enter button 2 Press the Up or Down Arrow to box the desired type ON OFF or PID 3 Press the Enter button to select Setting the High Limit for Dissolved Oxygen and Range on Tuning Trend Screen From the PROGRAM LOOP screen 1 Press the Down Arrow to box INPUT HI 2 Press the Enter button to select The Series 7020 Dissolved Oxygen Analyzer User s Manual 43 The Series 7020 Dissolved Oxygen Analyzer User s Manual 44 3 Enter the numerical value desired as described in Section 4 1 2 The Input High Limit is the highest dissolved oxygen concentration in the control range It is also the upper limit on the Tuning Trend Screen Refer to the section on Control Tuning above Setting the Low Limit for Dissolved Oxygen and Zero on Tuning Trend Screen From the PROGRAM LOOP screen Press the Down Arrow to box INPUT LO and proceed as in Setting High Limit just above The Input Low Limit is also the zero value on the Tuning Trend Screen Refer to Control Tuning above Setting the Loop Gain PID only From the PROGRAM LOOP screen 1 Press the Down Arrow until GAIN is boxed 2 Press the Enter button to select 3 If OFF is displayed press the Up Arrow until zero is displayed 4 Setthe desired value as described in Section 4 1 2 5 To turn Gain off see below Setting the Loop Reset PID only
8. Label Set Assembly Directions Single Current 2 DI Output Card Terminal Block Terminal Block Subplate Label Set Assembly Directions 51204293 501 Replacement Kit for CPU Backplane Card CPU Backplane Available on all 7020 DO Analyzers Assembly Instructions Input Circuit Card Rear Terminal Block 8 POS Terminal Block Subplate Label Set Assembly Instructions A fused disconnect switch to terminals to connect AC mains needed for all CE units Directions 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual 77 Appendix A Noise Testing Appendix A Noise Testing Hints for Reducing Noise Specifications for proper operation of Honeywell dissolved oxygen DO probes demand that the alternating current AC voltage signal noise between anode and shield connections and cathode and shield connections be less than 1 mV AC While it is the user s responsibility to assure that this specification is met the following are some hints that have been successful in reducing these signals to the required value in a variety of installations 1 2 First eliminate external connections as a source of excess noise After installation of all wiring use a digital voltmeter to check the following voltages Anode Shield 1 2 to 2 0 VDC depending on oxygen level less than 1 mV AC In low ppb measurements this value may be Zero Cathode Shield mVDC less than 1 mV AC Any readings greater than the
9. 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual 57 The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 Press the Enter button to select 3 Press the Up or Down Arrow to box the desired value or selection 4 Press the Enter button to select Auto Ranging 7021 ppb Units Only 58 The Series 7020 analyzer may be programmed to change the range represented by the analog output This feature allows a recorder to provide a useful trace of dissolved oxygen concentration over the whole range of the ppb analyzer low ppb to air saturation values This section describes programming autoranging The optional three mechanical relays are required to allow autoranging to function and the three relays must be dedicated to autoranging as described in Appendix H Output Autoranging Programming Autoranging Procedure 1 Goto the MAIN MENU PROGRAM screen 2 Press the Down Arrow to box AUTO RANGE 3 Press the Enter button to select 4 The AUTO RANGE screen is displayed with RANGE 0 HI boxed AUTO RANGE 20 00 RANGE 1 HI 200 00 RANGE 2 HI 2000 00 RANGE 3 HI 20000 00 The values shown in the screen are the factory set default values To change the high value for a range 1 Press the Down Arrow to box the range to be reprogrammed 2 Press the Enter button to select 3 Set the new value as described in Section 4 1 2 To facilitate the connections to the dedicated relays it is strongly advised that RANGE 0 be prog
10. 3 Atimed Automatic Calibration Automatic Cleaning is initiated and HOLD OUTPUTS YES has been programmed 4 Acleaning is initiated because the DO has fallen below the CLEAN LIM PPM and HOLD OUTPUTS YES has been programmed 5 The gt button is pushed and HOLD OUTPUTS YES has been programmed 6 From the AUTOCAL STATUS screen DO CLEAN or DO CAL is selected and HOLD OUTPUTS YES has been programmed 7 Discrete Input 1 is closed and HOLD OUTPUTS YES has been programmed The Control output only is held but may be adjusted manually for either of the following actions 1 Discrete Input 2 is closed 2 The ADO is operating as a controller in the automatic mode and the auto manual button is pushed placing 96 the ADO into the manual mode The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Appendix J Automatic Calibration for Pure Water Appendix J Automatic Calibration in Pure Water A typical setup for automatic calibration in a boiler water sampling system is shown in Figure 4 6 The solenoid valve and connections must be positively airtight to prevent leakage and erroneous measurements The solenoid valve is wired to the normally open contacts of the dedicated relay input programmed for PRB OUT and appropriate power When automatic calibration is initiated the following sequence occurs 1 HOLD is activated PRB OUT relay is activated Calibration waits for stability and stores calibration data or times out am
11. adjust appears in the upper right corner of the screen and the operating probe bias may be adjusted by pressing the Down Arrow to decrease or the Up Arrow to increase the probe bias The adjusted value is indicated after SB in the upper left corner of the Probe Bias Test screen and also by the position of the vertical line that crosses the current voltage curve When the operator changes the bias and presses the Enter button if Prom version is C 3 or greater a new screen is displayed NEW BIAS ACCEPTED PRESS ENTER TO RETURN TO MENU Pressing the Enter button returns the unit to the OFF LINE DIAGS menu To leave the probe bias test without changing the bias 1 The user presses the Menu button 2 The COMPLETING BIAS TEST message is displayed for a moment and the operator is returned to the OFF LINE DIAGS menu 3 Ifthe scan bias is not equal to the operating bias the COMPLETING BIAS TEST is displayed until the scan bias value has reached that of the operating bias Relay Test This test allows the relays to be energized and deenergized manually to assure that they are functioning Procedure for performing the Relay Test 1 From the OFF LINE DIAGS screen press the Down Arrow to box RELAY TEST and press Enter to select Displayed is the RELAY TEST screen with TEST RELAY 1 boxed RELAY TEST 4 TEST RELAY 1 TEST RELAY 2 TEST RELAY 3 TEST RELAY 4 Press the Down Arrow to select the relay to be tested and press Ent
12. air calibration in the air While analyzer is online the Hydrazine concentration should be kept to less than 1 000 ppb or flashing may continue Consult Honeywell TAC or Application Engineers to determine effect of a Specific Chemical on DO reading 74 The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Diagnostics Troubleshooting Probe is connected to Input card may be bad Confirm that the unit is not working by If unit is under warranty call Honeywell TAC unit but unit is display Salinity input may be turned installing a 2 probe if available The unit If not under warranty call Honeywell for ON should display the exact same incorrect replacement card readings with the 2 probe If a 2 probe is not available perform the following procedure DO Flashing 0 0 Temp 0 0 Pressure 0 0 Put a 5K resistor on pins on TB5 pins 36 and 37 Place a straight wire from TB5 pins 33 and 34 Place a 10K ohm resistor on TB5 pins 34 and 35 If unit is working you should see a DO value of 7 6 ppm or 76000 ppb and a temperature of 25 C If you still see 0 0 s the input card is bad Determine if additional amounts of the following chemicals such as CI2 O3 H2 N2H4 or 502 have been recently added to the process Reduce the amounts of these chemicals and validate that the DO has returned to expected values Reference
13. Dissolved Oxygen Analyzer User s Manual 61 The Series 7020 Dissolved Oxygen Analyzer User s Manual oxygen meter whose probe is held very close to the probe of the analyzer Alternatively the probe may be removed from the measured sample and placed in a sample of known dissolved oxygen concentration Sample Calibration Procedure l 2 3 4 n 10 11 12 Power the probe for at least 1 hour Power for 24 hours if initial installation Press the Hold button if required Immerse the probe in the sample of known DO concentration and wait until the DO reading is steady From the MAIN MENU ONLINE screen press the Down Arrow button twice to box MANUAL CALIBRATION Press the Enter button to select the MANUAL CALIBRATION screen Press the Down Arrow button to box SAMPLE CALIBRATION Press the Enter button The following screen is displayed with the first digit of the DO value flashing GRAB SAMPLE CAL DO 6 31009 6310 09 if PPB PRESS ENTER TO SAVE PRESS MENU TO ABORT If the flashing first digit of the boxed number is not equal to the first digit of the known sample DO press the UP Arrow button until the correct first digit is displayed Press the Down Arrow button to accept the first digit and move to the second digit which is now flashing Press the Up Arrow button to scroll to the correct second digit and press the Down Arrow button to accept it and move to the third digit etc When the value
14. Earth Ground to stud at bottom of case Figure 3 4 Terminal 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual 23 Optional Dual Temperature Used for an additional measurement output Maximum load of 800 Current Measurement ohms Outputs Standard e Single Maximum load of 800 ohms Current Output DO Output to recorder or DCS 2 Discrete Remote Auto Inputs Clean Calibration Can be used to initiate automatic cleaning and or calibration as field configured If used it requires that a remote dry contact be closed for two seconds to initiate the clean cal cycle The contact must open before the sequence is complete to prevent initiating another clean cal cycle To determine which function will be initiated by closing DI 1 review Section 4 the end of the discussion describing Programming Automatic Calibration Automatic cleaning Can be used to force control into manual with a remote dry contact When the contact is closed control is in manual When the contact is open control is in automatic unless manual operation is selected from the Analyzer front panel Anode 33 R Reference 34 G Cathode 35 K Therm Y Therm O For probe with spade lug termination connection sequence is shield then top to bottom Disconnect in reverse order Probe damage may occur otherwise Accepts a 4 20 mA signal which
15. Power Connections The instrument may be connected to a power mains source of 85 to 265 VAC 50 or 60 Hz with no conversion change of fuse or special installation requirements To set Analyzer for optimum AC noise suppression a front panel selection of power frequency is made as part of the setup procedure See Selecting Mains Frequency in Section 4 3 3 The power mains should have a neutral L2 connection with less than 1 V RMS to earth ground If this cannot be supplied then provide an isolation transformer between the mains and the instrument with the secondary L2 connection earth grounded If power surges or voltage spikes can occur on the mains power install a surge suppresser If frequent power interruptions or brownouts can occur install an uninterruptable power source UPS 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual 15 A A The Series 7020 Dissolved Oxygen Analyzer User s Manual Safety Grounding The purpose of safety grounding is to protect against dangerous electrical shock to personnel A single point ground is recommended All metal structures panels cases boxes etc must be grounded All grounds must be connected together and fastened to a reliable earth ground with resistance less than 0 1 ohm If separate ground wire cannot be run from each structure they can be daisy chained together if the resistance from the farthest structure to earth ground does not exceed 0 1 ohm Always fo
16. Press the Enter button Displayed is the ALARMS screen with ALARM 1 boxed ALARMS ALARM 2 ALARM 3 ALARM 4 If the input to ALARM 1 were programmed to be DIS OXY dissolved oxygen concentration pressing the Enter button would display the PROGRAM ALARM 1 screen PROGRAM ALARM 14 TYPE LOW INPUT DIS OXY SET POINT 1 00 DEADBAND 0 50 This screen shows Alarm 1 has been programmed as a low alarm its input parameter is DIS OXY its setpoint is 1 00 again ppm DO and its deadband is 0 50 ppm DO The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Operation 4 3 2 Program Mode Introduction Described in this section is how to configure program the functions and values observed in the MAIN MENU ONLINE mode under REVIEW PROGRAM The order follows Table 4 1 ATTENTION Whenever the Analyzer is placed in the PROGRAM mode output values and alarm conditions that existed just prior to entering the program mode are held until the online mode is restored Also no new diagnostic messages appear and periodic Auto Clean Auto Cal are reset while sequential Auto Clean Auto Cal are not If a timed event Auto Clean Auto Cal is scheduled it is not executed There are two paths to the PROGRAM mode The first path is to press the Display button and then the Menu button The MAIN MENU ONLINE screen is displayed with the box around SET MODE Pressing the Enter button boxes ONLINE at the right MAIN MENU ONLINE _ J S
17. Press the Enter button to select 3 See the desired numerical value of the high output limit usually 20 mA See Section 4 1 2 Setting Numerical Values Setting the Output Low Limit From the PGM ANALOG OUTPUT screen Press the Down Arrow to box OUT LO 0 4MA 2 Press the Enter button to select 3 Setthe desired numerical value of the low output limit usually zero or 4 mA See Section 4 1 2 Setting Numerical Values Analog Output Programming Procedure DAT features only 42 Setting the Impulse Time The impulse time is the cycle time in seconds The relay turns on once a cycle with the duration of the ON time proportional to the control output From the ANALOG OUTPUT 4 screen 1 Press the Down Arrow to box IMPULSE TIME 2 Press the Enter button to select 3 Setthe desired numerical value See Section 4 1 2 Setting Numerical Values Setting the Minimum ON time From the PGM ANALOG OUTPUT screen Press the Down Arrow to box MIN ON TIME 2 Press the Enter button to select 3 Setthe desired numerical value See Section 4 1 2 Setting Numerical Values Setting the Minimum OFF time From the ANALOG OUTPUT screen 1 Press the Down Arrow to box MIN OFF TIME 2 Press the Enter button to select 3 Setthe desired numerical value See Section 4 1 2 Setting Numerical Values The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Operation Selecting the DAT output r
18. Rate action stops when the deviation stops changing Rate settings should always be kept low for stability usually less than 0 2 minute and is best left at zero where noisy readings are encountered Control Action Direction determines the direction in which the control works For aeration or oxygen injection attempting to maintain a high level of oxygen with a process which tends to have lower concentrations reverse action is required lower DO concentration results in increasing control output For de aeration or oxygen scavenger feed where DO levels are to be lowered direct action is required higher DO concentration results in increasing control output Feedforward Process Flow Input allows use of flowrate to produce an immediate effect on the control output without waiting for dissolved oxygen deviation to develop and for reset action to correct it Feedforward flow control is a basic multiplying function which approximately doubles the control output when the process flowrate doubles This multiplication is modified by adding in a small flow bias factor set 0 to 0 1 which prevents multiplying the control output by zero at zero flow Otherwise the reset action of the controller would wind up as it had no effect on control of the process The flow input 4 20 mA is converted to a 0 1 multiplier on the control output This control action is not affected by the full scale flow display value which scales the display only in desired engineerin
19. SET CLOCK AUTO RANGE SELECT DO OR SAL CONFIGURE SALINITY CONTRAST ADJUST MAINS FREQ MANUAL CALIBRATION AIR CALIBRATION SAMPLE CALIBRATION ZERO CALIBRATON PRESSURE CALIBRATION CALIBRATE AI CALIBRATE AO OFF LINE DIAGS PROBE BIAS TEST RELAY TEST OUTPUT TEST INPUT STATUS RESET UNIT INFORMATION SOFTWARE REVISION PART NUMBER COPYRIGHT DATE 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual 25 The Series 7020 Dissolved Oxygen Analyzer User s Manual 4 1 1 26 Display Area Menu Button Alarm and Diagnostic Up Arrow Button Display Area Down Arrow Button Clean Calibrate Button Enter Button Display Button Hold Button Bezel Set Screw Auto Manual Button Bezel Set Screw Figure 4 1 Series 7020 DO Analyzer Front Panel Button Functions As called out in Figure 4 1 Menu Button is used initially to enter the menu structure Subsequent depression of this button steps up one level in menu structure UP Arrow is used to move the selection box up scrolls up through a list of selections and increases the value of the digits being set DOWN Arrow is used to move the selection box down scrolls down through a list of selections and selects the next digit in a number being set Enter Button is used to select a menu item or to store a value or setting Display Button is used to restore the unit to the on line mode and display Subsequent depressions of this button will cycle through t
20. The CLEAN RINSING screen is displayed CLEAN RINSING MAX REM STEP 15 DO 8 96 PPM or 8960 2 PPB TEMP 202C PRESS MENU TO ABORT At the completion of the cleaning the CLEAN WAIT RESUME screen appears At the completion of the programmed resume time the CLEAN COMPLETE screen shows momentarily and then the screen returns to the AUTOCAL STATUS screen The cleaning operation performed is that programmed in PROGRAM MODE AUTO CAL AUTO CLEAN If HOLD OUTPUTS YES is selected in programming AUTO CAL AUTO CLEAN outputs and alarm conditions will be held during operations initiated from DO CLEAN or DO CAL The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 2 98 Operation Automatic initiation of cleaning and or calibration The screens observed during the automatic clean calibration operations depend on the operations that have been programmed in the PROGRAM mode to occur automatically For instance if both an automatic cleaning and automatic calibration are to be initiated at the end of a period the following screens are displayed If HOLD OUTPUTS YES is selected in programming AUTO CAL AUTO CLEAN outputs and alarm conditions are held during operations initiated automatically 1 As the automatic cleaning is initiated the CC RINSING screen is displayed for the programmed cleaning time C C RINSING MAX REM STEP 01 DO 8 61 PPM or 8614 0 PPB TEMP 23 2 C PRESS MENU TO ABORT This is followed by a fact
21. and the code is unavailable it is possible with the following procedure to 1 bypass security and 2 discover what the user configured codes are Procedure of bypassing security without knowing the security code If access to a secure area of the Series 7020 screens is attempted the SECURITY ACTIVE screen will appear SECURITY ACTIVE ENTER CODE FOR ACCESS Enter the number 783 and press the Display not the Enter button Displayed is the SECURITY ACTIVE screen with the user configured codes shown If desired record this code and then press the Enter button to gain access to the secure area Date Time This section describes how to set the internal clock upon which all timed functions are based Clock Setting Procedure 1 Go the MAIN MENU PROGRAM screen 2 Press the Down Arrow to box SET CLOCK 3 Press the Enter button to select 4 The SET CLOCK screen is displayed with HOURS boxed SETCLOCK 4 19 MINUTES 58 MONTH JUL DAY 5 5 set the hours press the Enter button 6 Usethe Up or Down Arrow to box the correct hours 7 Press the Enter button to select To set the minutes 1 From the SET CLOCK screen press the Down Arrow to box MINUTES 2 Press the Enter button to select 3 Press the Up or Down Arrow to box the correct minutes 4 Press the Enter button to select MONTH DAY YEAR and DATE FORM are set similarly 1 From the SET CLOCK screen press the Up or Down Arrow to box the function that is to be set
22. below those displayed on the screen Press the Down Arrow once more The selection box is at the bottom around REVIEW PROGRAM The up arrow T indicates that this is the last item on this list and that there are more above MAIN MENU ONLINE 7 MANUAL CALIBRATION CONTROL TUNING A Q AN AUTOCA REVIEW PROGRAM Setting Numerical Values Numerical values are set in one of three ways depending on whether the value is a configured value a selected value or a ramped set value Configured values include alarm set points analog input limits etc Entering a new number is accomplished by pressing the Up Arrow to scroll through digits 0 9 for each place and the Down Arrow to move the flashing digit one place to the right Pressing the Down Arrow eventually wraps around to the most significant place again Besides numerals 0 9 in the most significant place a minus sign may also be selected where needed Selected values are generally those involving time such as minutes hours and days of the month where only certain values are available To set a desired selected value box the number and press the Down Arrow to decrease or the Up Arrow to increase the value and enter button when the desired value is boxed To see examples refer to Program Mode SET CLOCK The only Ramped values are the set point and the control output shown on the ON LINE OPERATE LOOP screen Pressing the Up Arrow increases the output value and pressing the Down Arro
23. current Note that this probe current is in general different from the probe current for the last air calibration found in the MAIN MENU ON LINE ALARM DIAG SUMMARY Procedure for viewing input status 1 From the OFF LINE DIAGS screen press the Down Arrow to box INPUT STATUS and press Enter to select 2 Displayed is the INPUT STATUS screen A typical screen is INPUT STATUS DI 1 OFF DI2 OFF PROBE CURRENT 94 168 This screen shows that both discrete inputs are OFF and the present live probe current 1s 94 168 micro amps The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Operation Reset Unit Occasionally a microprocessor based unit locks up ceases to function correctly as a result of an electrical spike or some other cause Also it is necessary to reset the unit after a change has been selected for MAINS FREQUENCY It is the purpose of RESET UNIT to restore the analyzer to proper functioning after such an occurrence All programmed information and stored values alarms etc are saved during and after RESET UNIT has been executed Procedure for Resetting the Unit There are 2 equivalent methods for resetting the unit Either 1 Press simultaneously the Calibrate and the Menu buttons 2 From the MAIN MENU MAINT screen press the Down Arrow to box RESET UNIT and press Enter to select If the SECURITY ACTIVE screen appears enter the MASTER CODE and press enter With either method the Seri
24. figure shown above is as follows As the bias voltage of the oxygen consuming electrode relative to an internal reference electrode is increased there is an initial increase in current as more and more of the oxygen that approaches the electrode is consumed However at about 0 2V the current stops rising and a flat region independent of voltage is observed It is in this region that all of the oxygen approaching the electrode is consumed Increasing the voltage cannot increase the current because there is no more oxygen to be consumed Finally at a voltage exceeding 0 8 volts a second process hydrogen production begins to occur and the current again rises To achieve stable results the probe should be operated within the flat region so that small changes in the probe characteristics result in negligible changes in probe current In some industrial wastewater applications particularly those in petroleum refineries active gases dissolved in the wastewater can cause this current voltage characteristic to shift moving the flat region to other usually lower voltages Also in some very rare instances the chemical treatment of boiler water can cause this current voltage characteristic to shift moving the flat region to other usually lower voltages To summarize the Probe Bias Test automatically varies the probe voltage while displaying the probe current as shown in the figure At the completion of the test an opportunity to change the bias
25. limits shown above indicate electrical noise that should be corrected Systematically remove external connections to the Analyzer noting if the voltage drops within the acceptable limit If a noise source is identified improved shielding grounding or re routing of that cable may be required In attempting to reduce AC noise do not ground the shield as this shunt filtering is designed to reduce electromagnetic interferences EMC If the measured voltages are greater than procedures states one at a time remove an external connection ex isolated outputs and relays and re measure the AC signal If the AC signal has decreased after disconnecting one of these connections then this was the source of the noise If the noise remains at a value greater than 1 mV AC after disconnecting all external connections described in step 1 disconnect the shield wire from Terminal 38 and connect it to instrument ground inside the case If the noise remains at a value greater than 1 mV AC after performing step 2 reconnect the shield wire to Terminal 38 and connect an additional jumper wire from ground to the shield connection Terminal 38 If these steps fail to reduce the Anode Shield and Cathode Shield AC signals to the specified AC or less obtain an isolated transformer and power the analyzer from that 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual 79 Appendix B Probe and Analyzer Tests Appendix B Probe and
26. part of the temperature compensation The readout is 100 when measuring in air or in a solution saturated with air regardless of the temperature Thus an air calibration will always produce approximately a 100 saturation readout With this readout salinity should be left at zero since the normal salinity correction also does not apply to non aqueous media When percent saturation readout is selected the on line displays read in percent saturation however all the dissolved oxygen settings in the Analyzer remain in concentration units ppm or ppb Therefore percent saturation alarms output etc Should be used only if the process temperature is nearly constant To set alarm points output limits etc it is necessary to convert a percent saturation value to concentration This is done by multiplying the percent saturation as a fraction times the air saturation value at the process temperature to obtain the corresponding concentration setting For example assume it is desired to have an alarm setpoint at 75 saturation while operating at 20 C The corresponding setpoint is the 0 75 x 9 07 6 80 ppm Table 6 2 Dissolved Oxygen Solubility vs Temperature From Standard Methods for the Examination of Water and Wastewater Sample Temperature C Solubility ppm mg L o 1 2 3 4 5 6 7 8 9 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual 87 2 98 Appendix F Leak Detection in PPB Applications Appendix
27. shift of the curve either to the left or right of the cursor OB 600 move the cursor so that it is positioned on the flat portion of the curve At this point the probe is suspect and should be sent to TAC for analysis If the problem is that the cursor is positioned too far to the left or right of the flat portion of the curve then move the cursor back to the flat portion of the curve where OB 600 Perform another Air Calibration to correct any changes that occurred during the PBT If you reached this point you have both a working probe and analyzer which are calibrated to one another correctly The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Appendix C Parameters Affecting Dissolved Oxygen Measurement Appendix C Parameters Affecting Dissolved Oxygen Measurement The actual quantity of oxygen that can be present in solution is governed by the partial pressure of the gas in the atmosphere the solubility in solution the temperature and purity of the solution Pressure ADO Progeny Analyzers include an internal pressure sensor and software algorithm that automatically compensates for atmospheric pressure variations during calibration Pressure variations have a direct effect on the dissolved oxygen concentration during normal measurement so no pressure compensation is applied at that time The information given below is only for reference to published solubility tables and is not needed for operation of the Analyzer
28. test is terminated without completing the full 1 0 volt sweep The bias voltage test may also be terminated at any time by pressing the button Under normal conditions the completed display shows a graph of current as a function of voltage with the following features from approximately 0 to 0 2 volts a fairly rapid increase in current is observed from approximately 0 2 to 0 8 volts the current exhibits a flat region where it is nearly independent of voltage and at some voltage above about 0 8 volts the current rises quickly A typical current voltage curve is shown below The Sweep Bias millivoltage SB is a voltage from 0 1V that is applied to perform the test The Operating Bias millivoltage OB is the current position of the cursor on the graph and represents the current bias voltage The horizontal axis numerals are in hundreds of millivolts The Series 7020 Dissolved Oxygen Analyzer User s Manual 67 The Series 7020 Dissolved Oxygen Analyzer User s Manual 68 SB 0 000 OB 600 A Figure 4 2 Display of Probe Bias Test Done in Air Note that the curve is quite flat at 0 6V This means that even rather large changes in the probe current voltage characteristic does not affect the current and thus probe sensitivity at 0 6V In general the curve formed by decreasing voltage is not identical to that formed by increasing voltage This hysteresis is a function of the voltage scan rate and may be ignored The interpretation of
29. to box CALIBRATE AI and hit the Enter key If the SECURITY ACTIVE screen appears enter the CALIB CODE and press the Enter key 2 The CALIBRATE AI screen is displayed with CALADC ZERO boxed CALIBRATE AI i CAL ADC ZERO A A LR CAL 3 5 UA ZERO CAL 35 UA ZERO 3 Press the Down Arrow five times to box CAL ADC MAX 4 Press the Enter key A screen displaying CALIBRATION IN PROGRESS is displayed momentarily and then the screen returns to the CALIBRATE AI screen and the ADC MAX calibration is complete To calibrate ADC zero m Remove the 5V source and connect Unit Pin 39 directly to Unit Pin 40 From the CALIBRATE AI screen press the Up Arrow to box CAL ADC ZERO ce CON Press the Enter key The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Operation 10 A screen displaying CALIBRATE IN PROGRESS is displayed momentarily and then the screen returns to the CALIBRATE AI screen and the ADC ZERO calibration is complete Procedure for Calibrating DO Input Ranges 1 10 11 12 13 From the MAIN MENU MAINT screen press the Down Arrow to box CALIBRATE and press the Enter key The CALIBRATE AI screen is displayed with CAL ADC ZERO boxed CALIBRATE AI J CAL ADC ZERO CAL 35 UA ZERO CAL 3 5 UA ZERO CAL 35 UA ZERO Press the Down Arrow nine times to box CAL 350 UA MAX Introduce 350 UA to Unit Pins 35 and 38 Press the Enter key A screen displa
30. unused points of the recorder stay at the low end of scale For this setup Relays 3 4 and 5 must have assigned inputs Ranges 1 2 and 3 respectively For data acquisition systems with greater capabilities the Analyzer relay contacts can be connected to discrete inputs for scaling identification and only one analog input is needed in the data acquisition system instead of the four used with the recorder In that case a jumper from terminal 9 to 13 is used and range indication would be given by continuity from terminal DO3C to Range 1 open Range 2 DO4NC Range 3 DOSNC Range 4 DOSNO Relay Action with Range Change Diss Oxygen Range D03 D04 DOS Recorder al b Point 095 ppb ppp Deenrg Deenrg Deenrg Bh 20 200 20 200 Engr Deenrg Deenrg 2 200 2000 200 2000 Engr Engr Deenrg 3 q 2000 20 000 2000 20 000 Engr Engr Engr 4 Multipoint Recorder using points 1 4 with shunt resistors n l l O O O O O O e Series 7020 Dissolved Oxygen Analyzer with terminals 9 16 Relay 4 Normally Open terminal is internally jumpered to Relay 5 Common Figure H 6 1 Output Auto Ranging Connections The Series 7020 Dissolved Oxygen Analyzer User s Manual 93 Appendix Summary of CAL CLEAN and HOLD Appendix 1 Summary of CAL CLEAN and HOLD The convenience of using the ADO analyzer is enhanced by the many ways in which cleanings and or calibrations may be e
31. used as range indicators for the analog output signal Automatic cleaning and or calibration can be initiated by internal clock by external contact closure or by front panel push button Alarm and diagnostic histories can be retained in memory for periodic review and validation purposes The Honeywell Series 7020 Dissolved Oxygen Analyzer can provide complete PID control capability with an option of three simultaneous analog output signals for dissolved oxygen temperature and CAT Current Adjusting Type control On off and DAT Duration Adjusting Type or time proportioned control are also available with relay outputs Control can be switched between automatic and manual either at the analyzer or by closing a remote contact An auxiliary input may be used to 1 correct dissolved oxygen values for salinity 2 control based on a remote set point or 3 bias the control output with a flow input Figure 1 1 Series 7020 Dissolved Oxygen Analyzer 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual 1 The Series 7020 Dissolved Oxygen Analyzer User s Manual Description of Probe The probe is housed in a high quality impact resistant PVC or stainless steel casing One end has a 1 NPT male thread for mounting and a side exit is provided for the cable The sensor extends from the housing and is covered by removable cage which allows sample entry while preventing physical damage The probe has a permanent electrolyte which is s
32. voltage is provided Thus even where significant gaseous contamination might otherwise interfere with the response of the probe to dissolved oxygen this advanced feature allows the probe to operate If the results of the probe bias test should ever be significantly different from those shown in the figure Honeywell Service should be consulted Procedure for Performing the Probe Bias Test 1 From the OFF LINE DIAGS screen with PROBE BIAS TEST boxed press the Enter button to initiate the probe bias test The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 2 98 Pi ae Operation This displays the current voltage screen with the live relative value of current as a function of the changing voltage The SB in the upper left corner displays the live changing Sweep Bias voltage in millivolts The OB indicates the Operating Bias voltage The R stands for running indicating that the test is taking place The Probe Bias Test may be terminated at any time by pressing the Menu button The bias voltage is returned to its pre test value at a rate of 10 mv sec Adjusting the probe bias voltage If the probe bias test shows that the vertical line representing the operating voltage does not cross the flat portion of the current voltage curve as in Figure 4 2 the operating voltage should be adjusted Procedure for Adjusting the Probe Bias Voltage 1 4 At the conclusion of the probe bias test an A for
33. with ground loops inductively coupled by parallel conductors running near signal or analyzer power leads or may be coupled by radiation as with radio frequency interference Appropriate location and or protection by suppression or shielding must be applied to minimize such noise pick up When contacts or outputs are wired with hard contact switches to control an inductive load such as a motor starter or solenoid additional transient noise suppression must be provided A capacitor and a resistor must be installed in parallel with and preferably close to the inductive load as shown in the accompanying illustrations For AC operation a MOV must be placed across the inductive load For DC operation a diode must be placed across the inductive load See Figures 3 2 and 3 3 for noise suppression connections and recommended component values for each type of device with Honeywell part numbers indicated See Appendix A for a Noise Suppression Test ATTENTION Low Level Inputs Probe and Auxiliary Inputs must be kept separated from High Level 110 VAC wiring power and relay Do not Run Low Level wiring in any conduit containing 110 VAC or any other High Level signals or switching circuit wiring 16 The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 AC Load Instrument Field Install MOV at Location of Load 411726 for 120V 057331 for 240V Inductive Load Present on Card Installation DC Load Instrum
34. without contacting Honeywell in advance to obtain a return goods authorization Inspection All products are calibrated and tested at the factory prior to shipment Examine the model number on the unit to verify that it has the correct optional features See Section 2 3 for information on features associated with model numbers Storage and Shipment The Honeywell Series 7020 Dissolved Oxygen Analyzer is a complex electronic system involving high speed computing components and low level electrical signals Proper site selection preparation and installation are vitally important in achieving a trouble free system The following items must be considered before selecting a site for installation e Physical mounting and location e Power line mains conditioning e Grounding for personal safety e Grounding for noise immunity e Suppression of noise from electrically connected devices and cables e Suppression of induced noise from nearby not connected sources e Suppression or shielding from high level radio frequency sources Location A suitable physical environment in compliance with Specifications is necessary to insure proper instrument performance The analyzer meets SAMA PMC 31 1 condition 2 vibration tolerance but must be located in an area free from severe vibrations Honeywell is not responsible for problems caused by environmental conditions not in compliance Allow sufficient space around the instrument for adequate cooling air cir
35. x 106 x 250 x 10 x 770 9986 x 10 or 10 ppb 20 9 x 10 760 Tf the temperature of the process water is not at 25 C use Solubility Tables in Honeywell Dissolved Oxygen Analyzer Operator Manual and the process water temperature to determine the Air Saturated value Special Requirements Note 1 Gas Mixture is Oxygen in Nitrogen use Gravametric Gases analyzed to 1 of contained gas Get Certificates of Conformance and Analysis on the purchased gas Note 2 Dual Stage Ultra high purity high flow pressure regulator non corrosive surface Try to get this from the gas supplier to be consistent with their recommended setup Example supplier Scott Model 18 Series Note 3 Glass Gas Washing bottles with fritted disc and beaker Gas bottle should be filled 3 4 with water Example supplier Fisher Cole Palmer Note 4 Piping around glass wash bottle should be heavy wall flexible plastic Piping that goes into beaker should be submerged about 1 2 into beaker of water Note 5 All other piping should be rigid polypropylene tubing Note 6 All calculations are based on 25 Deg C 7931 Dissolved Oxygen Probe Model 793 1 40 30 Rigid Piping Flow Through Regulator Chamber 3 1 31063336 Note 4 Flexible Piping Figure G 1 Suggested ppb Dissolved Oxygen Test Set up 92 The Series 7020 Dissolved Oxygen Analyzer User s Manual Honeywell Model 7021 Dissolved Oxygen Analyze
36. 0 m to the antenna e In special cases when highly susceptible apparatus is used in close proximity the user may have to employ additional mitigating measures to further reduce the electromagnetic emissions of this equipment SYMBOL DEFINITIONS This CAUTION symbol on the equipment refers the user to the Product Manual for additional information This symbol appears next to required information in the manual Protective earth terminal Provided for connection of the protective earth green or green yellow supply system conductor WARNING risk of electric shock This symbol warns the user of a potential shock hazard where voltages greater than 30 Vrms 42 4 V peak or 60 BVdc may be accessible Honeywell Industrial Automation and Control Automation College 2820 West Kelton Lane Phoenix AZ 85023 602 313 5669 The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 About This Document Abstract This manual contains instructions for installation and operation of the Series 7020 Dissolved Oxygen Analyzer Revision Notes The following list provides notes concerning all revisions of this document Rev ID Date Notes 0 5 97 This is the initial release of the Honeywell version of the L amp N manual part number 278608 Rev A1 The manual has be reformatted to reflect the Honeywell documentation style and updated to reflect the changes in the product offering Additions have also been made for CE conformity 1 7 97 This
37. 25 If a voltage meter is used a 250 ohm resistor must be placed across the output terminals to provide the needed 1 5 drop for the calibration WARNING This procedure should be performed by a qualified electrical technician Procedure for Calibrating Analog Outputs 1 2 98 Open the front bezel of the 7020 Analyzer and connect the voltmeter across the analog output leads being calibrated The Series 7020 Dissolved Oxygen Analyzer User s Manual 65 The Series 7020 Dissolved Oxygen Analyzer User s Manual SEN 11 12 13 14 Turn power on For each analog output to be checked first go to the ONLINE mode by pressing the Display and Menu button Press the Down Arrow to box REVIEW PROGRAM and press Enter to select Press the Down Arrow to box ANALOG OUTPUTS and press Enter to select Press the Down Arrow if necessary to box the analog output to be checked and press Enter to select Displayed is the PGM ANALOG OUTPUT screen with AO TYPE boxed PGM ANALOG OUTPUT 1 AO TYPE CAT or DAT INPUT 8 5 INHILIMIT 200 INLOLIMIT 00 Press the Down Arrow five times to reveal the output limits PGM ANALOG OUTPUT 1 J IN HILIMIT 20 0 INLOLIMIT 40 OUT HI 20 0 OUT LO 0 4 MA 4 0 Confirm that the displayed output limits OUT HI and OUT LO 0 4 MA are the limits that you want to test If they are not then go to the Program Mode Analog Outputs and change them to the desired values Now retu
38. 43 204 29 f IPS PIPE 2 828 71 83 a gt SUPPLIED REAR VIEW 5 CONDUIT FITTING HOLES 886 22 50 BOTTOM VIEW VERTICAL REAR PIPE MOUNTING FOR HORIZONTAL PIPE MOUNTING ROTATE MOUNTING BRACKET DET 1 90 FOUR 265 HOLES FOR WALL MOUNTING OPTION BOLTS SUPPLIED BY USER 3 000 76 19 1 500 38 10 WALL MOUNT OPTION Bam RAE AN 2 1 30404 fU BOLT T PPE 3 4 00306 8 HEX tia ETNA KLL er 1 046849 M X Toss PA 6 188 156 54 p SEE NOTE 3 USER S PANEL 1 750 44 45 ACCESS SCREWS E FRONT VIEW 0 NOTE O RIENTADION MOUNT AS SHOW PANEL THICKNESS UP To 312 7 92 PANEL MOUNTING 099 1 OE 43 137 9 4 4 B 6 69 00 1038 1 5 43 99 00 BEE 38 1 500 38 1 LA leac BETWEEN VERTICAL CUTOUTS ADDITIONAL SPACING REQ D iF CONDUIT FITTINGS ARE USED PANEL CUTOUT NOTES 1 Do not over tighten fasteners when panel mounting unit 2 Remove backing from gasket and adhere ine sket to panel before installing unit 3 Up 250 6 35mm may be cutoff from un notched end of det 10 to fit into a 6 152 4mm deep enclosure Figure 3 1 Mounting and Dimensions 14 The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 N N Installation 3 2 Wiring CAUTION e Disconnect mains power before opening case and making wiring connections e wiring must be done by qualified
39. 6 T 8 9 Go to the MAIN MENU MAINT screen From the MAIN MENU MAINT screen press the Down Arrow to box MAINS FREQ Press the Enter button to select The MAIN MENU MAINT screen remains but a frequency value either 50 Hz or 60 Hz is boxed to the right of MAINS FREQ MAIN MENU MAINT 4 SET MODE MAINT CONTRAST ADJUST OFF LINE DIAGS MAINS FREQ Press the Down or Up Arrow to box the desired frequency selection Press the Enter button to select The box moves to the left around MAINS FREQ To complete the change in frequency press the Down Arrow to box RESET UNIT Press the Enter button to select It is necessary to reset the unit after a change in Mains Frequency Manual Calibration Units with Software Version C 3 or Higher To access the MANUAL CALIBRATION screen and initiate one of the calibrations displayed follow one of the procedures listed below The procedure to be followed is dependent on the version of the PROM installed in the analyzer For PROM Versions Prior to C 3 2 98 1 From the MAIN MENU ONLINE screen press Down Arrow button until MANUAL CALIBRATION is boxed The Series 7020 Dissolved Oxygen Analyzer User s Manual 59 The Series 7020 Dissolved Oxygen Analyzer User s Manual 60 2 Pressing the Enter Button reveals the types of manual calibration available ATR CALIBRATION SAMPLE CALIBRATION ZERO CALIBRATION 7021 PPB units only and PRESSURE CALIBRATION 3 Press the Down
40. ARM Press the Enter button to select Press the Up or Down Arrow to box desired input type VES MUI vu de Press the Enter button to select Choices for input parameters for analog outputs are DIS OXY dissolved oxygen concentration fixed range AUTORNG dissolved oxygen concentration auto range PPB only RSP remote set point FLOW PCT SAT percent saturation CTRL OUT control output PRESSURE TEMP temperature SAL salinity ATTENTION For a PPM Honeywell Series 7020 autoranging is not available and should not be selected as an input parameter If AUTORNG is chosen the Honeywell Series 7020 Dissolved Oxygen Analyzer functions as if DIS OXY were chosen Setting the Input High Limit From the PGM ANALOG OUTPUT screen 1 Press the Down Arrow to box IN HI LIMIT 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual 41 The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 Press the Enter button to select 3 Enter the numerical value desired as described in Section 4 1 2 The Input High Limit is the input value that results in the maximum analog output Setting the Input Low Limit From the PGM ANALOG OUTPUT screen Press the Down Arrow to box IN LO LIMIT and proceed as in Selecting the Input High Limit just above Analog Output Programming Procedure CAT features only Setting the Output High Limit From the PGM ANALOG OUTPUT screen 1 Press the Down Arrow to box OUT HI 2
41. Analyzer Tests Before performing an air leak detection it is necessary to determine that both Probe and Analyzer are working properly Assumptions The probe and analyzer should be connected the analyzer powered up and the probe in the process water for at least 24 hours prior to testing No additional configuration should be done The process is as it would be normally All equipment in the process is online and contributing to the process This is to ensure that the tester is working in a known environment Check for probe membrane leakage If the probe has membrane leaks incorrect readings may occur Follow this procedure to check for probe membrane leakage 1 2 Remove probe from analyzer and process Using either the flow chamber or original protective adapter screw this piece on the probe If using the adapter wrap electrical tape around the adapter to seal the holes Next wrap electrical tape around the hole on the side of the probe The intent is to create a reservoir for the sealed probe Position probe with the membrane pointing up Make a solution of Salt water using 2 T of salt and 8 oz of water Fill the probe via the adapter or flow chamber opening with the salt water until water is overflowing from the top of the reservoir If using the adapter or a PVC flow through chamber place a wire uncurled paper clip in adapter or flow through chamber opening such that one end is immersed in the salt water
42. Arrow button until the calibration desired is highlighted 4 Press the Enter button to select For PROM Versions C 3 or Greater 1 From the Maintenance Menu press the Down Arrow button until MANUAL CALIBRATION is boxed 2 Pressing the Enter Button reveals the types of manual calibration available AIR CALIBRATION SAMPLE CALIBRATION ZERO CALIBRATION 7021 PPB units only and PRESSURE CALIBRATION 3 Press the Down Arrow button until the calibration desired is highlighted 4 Press the Enter button to select If removing the probe from the sample for calibration air and zero calibration press the Hold button to maintain outputs and alarms in their current condition A bright diagnostic band HOLD ACTIVE appears across the bottom of all screens For instance if the Hold button was pushed just prior to initiating air calibration the AIR CAL IN PROGRESS screen would be displayed with HOLD ACTIVE shown at the bottom of the screen For Prom Versions Prior to C 3 AIR CAL IN PROGRESS DO 8 77 PPM or 8774 02 PPB TEMP 20 9 C PRESS MENU TO ABORT HOLD ACTIVE For Prom Versions C 3 or Greater AIR CAL IN PROGRESS CAL MODE HOLD ACTIVE Hold may be deactivated at any time by pressing the Hold button a second time Alternatively the Hold times out after the set time period The factory setting is 30 minutes The time out setting can be set from 1 to 120 minutes from the MAIN MENU PROGRAM mode Air Calibration Thi
43. Discussion on DO Measurements in Appendix D Reading is higher tan Chemical Interference expected Assumption is that the probe is a known working probe Remove probe from process and perform a Probe Bias test to see if the probe characteristic curve is like the one in the manual If not call Honeywell TAC for further instructions Difficuity seeing the LCD displays are affected by Go to Maintenance Menu under Adjust display as it is very dim temperature change Contrast Adjust screen until you can see display until you can see display clearly 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual 75 Accessory and Spare Parts List 6 Accessory and Spare Parts Kits Misc Parts for Ail 7020 DO Analyzers 51198075 501 51198076 501 New Replacement Kit for Terminal Block Safety Cover on all 7020 DO Analyzers New Replacement Kit for Rear cover on all 7020 DO Analyzers 51198078 501 51204287 501 51204288 501 51204289 501 Bezel Replacement Kit Available on all 7020 DO Analyzers 51204290 501 New Replacement Kit for 2 Additional Current Outputs Available on all 7020 DO Analyzers 51204291 501 Replacement Kit for Power Supply Card Available on all 7020 DO Analyzers 51204292 501 Replacement Kit for Single Current 2 DI Card Available on ali 7020 DO Analyzers New Replacement Kit for 3 Additional AC SS Relays Available on all 7020 DO Analyzers New Replacement Kit for 3 Add
44. ET MODE ONLINE ALARM DIAG SUMMARY MANUAL CALIBRATION CONTROL TUNING Pressing the Down Arrow button changes the boxed selection from ONLINE to PROGRAM MAIN MENU ONLINE 4 SET MODE ALARM DIAG SUMMARY MANUAL CALIBRATION CONTROL TUNING Pressing the Enter button displays the screen MAIN MENU PROGRAM with the J in the upper line indicating that the list is longer than 4 items and the Analyzer is in the PROGRAM mode MAIN MENU PROGRAM J PROGRAM ALARMS RELAYS ANALOG OUTPUTS The alternate path is to keep pressing the Menu button until one of the three MAIN MENU screens is displayed Once it is displayed with SET MODE highlighted the desired mode is selected by 1 Pressing the Enter button 2 Pressing either the Up or Down Arrow button until the desired mode is boxed 3 Pressing the Enter button to select the mode that is highlighted Alarms An alarm is a warning signal presented on the Analyzer display whenever a measured or calculated value exceeds its set limit This section describes how to program the conditions that cause each of the five available alarms to activate To activate any external device it is necessary to program both an alarm and one or more of the available relays to be activated by the corresponding alarm 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual 35 The Series 7020 Dissolved Oxygen Analyzer User s Manual 36 Alarm Programming Procedure 1 Get to the MAIN MENU PROGRAM sc
45. F Leak Detection in PPB Applications Before performing and air leak detection it is necessary to determine that both the probe and analyzer are working properly Refer to Probe and Analyzers tests in Appendix B 1 First check to see that the probe contains an O ring Per the probe directions an O ring must go into a probe that is used in ppb applications This creates a tight seal between the probe and flow chamber MAKE SURE THIS O RING IS IN THE PROBE 2 Unless already in air open the probe to air for 30 seconds 3 Put it back into the process again 4 Allow the DO to drift down to the 20 30 ppb range The 20 30 ppb range was chosen because the reading was low enough that the drift was small with respect to the changes observed for various flow rates but high enough that changes could be observed 5 At this range vary the flow rate from 10 to 100 ml min These low flow rates were selected for two reasons The first the tester many only have a 0 100 ml min flow indicator The other reason is a leak that exists at this low flow will cause a change in the DO reading 6 Ifthe DO value at 10 ml min exceeds the DO value at 100 ml min a leak is present in the sampling line 7 Fixing the leak may require plastic tubing to be replaced with metal tubing tape to be put on fittings and or fittings at the bottom of the probe to be tighten securely 8 Now repeat Steps 2 6 until the flow can be changed from gt 100 ml min to 10 m
46. From the AUTO CAL AUTO CLEAN screen press the Down Arrow until MAX CAL MIN maximum calibration time in minutes is boxed 2 Press the Enter button to select 50 The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 2 98 Operation 3 Set the desired value as described in Section 4 1 2 The purpose of setting MAX CAL MIN is to keep the analyzer from continuing an air calibration for a time longer than the user wants the probe to be out of the process If this user selected time is reached before calibration is complete the next step in the cycle is initiated typically restoring the probe to the sample the existing calibration is retained and the diagnostic message REQUEST FAIL flashes across the bottom of the screen MAX CAL MIN may be set to 5 to 120 minutes The actual maximum time allowed for an air calibration exceeds this by at least 30 seconds while temperature stability is confirmed The MAX CAL MIN programmed will apply to Manual Air Calibration too Setting the DO limit that causes a cleaning cycle to be Initiated PPM Units Model 2022 only 1 From the AUTO CAL AUTO CLEAN screen press the down Arrow until CLEAN LIM PPM is boxed 2 Press the Enter button to select 3 Set the desired value as described in Section 4 1 2 The signal from the dissolved oxygen probe can decrease for two reasons e The dissolved oxygen concentration decreases e oxygen consuming layer builds up on the probe The purpose of t
47. Honeywell The Series 7020 Dissolved Oxygen Analyzer User s Manual 70 82 25 66 Rev 3 2 98 Tetal Plant m 6 gt Copyright Notices and Trademarks Printed in U S A Copyright 1997 1998 by Honeywell Inc Revision 3 2 98 While this information is presented in good faith and believed to be accurate Honeywell disclaims the implied warranties of merchantability and fitness for a particular purpose and makes no express warranties except as may be stated in its written agreement with and for its customer In no event is Honeywell liable to anyone for any indirect special or consequential damages The information and specifications in this document are subject to change without notice CE Conformity This product is in conformance with the protection requirements of the following European Council Directives 89 336 EEC the Electromagnetic Compatibility Directive and 72 23 EEC the Low Voltage Directive Conformance of this product with any other CE Mark Directive s shall not be assumed Attention The emission limits of EN 50082 2 are designed to provide reasonable protection against harmful interference when this equipment is operated in an industrial environment Operation of this equipment in a residential area may cause harmful interference This equipment generates uses and can radiate radio frequency energy and may cause interference to radio and television reception when the equipment is used closer than 3
48. LETE MAX REM STEP 01 DO 8 61 PPM or 8614 0 PPB TEMP 23 2 C PRESS MENU TO ABORT The Series 7020 Dissolved Oxygen Analyzer User s Manual 33 The Series 7020 Dissolved Oxygen Analyzer User s Manual ATTENTION While the analyzer is in either off line mode PROGRAM or MAINT automatic calibration and cleaning are disabled Review Program 34 REVIEW PROGRAM allows the displaying of various values and states that have been configured for Alarms Relays Analog Outputs control Loop Automatic Calibration and Cleaning the Calibrate button the Hold button Auxiliary Inputs Clock Automatic Ranging and DO or Saturation These functions are described in detail along with how they are configured in Section 4 3 Program Mode Explained here is simply how to display values and states that have been configured Review Program Procedure 1 4 5 From the MAIN MENU ONLINE screen Press the Down Arrow button until REVIEW PROGRAM is boxed Pressing the Enter button displays the REVIEW PROGRAM screen REVIEW PROGRAM 4 ONLINE ALARMS RELAYS ANALOG OUTPUTS Pressing the Down and Up Arrow buttons moves the selection box up and down within the same level of selections Pressing the Enter button accepts what was highlighted and moves the sequence to the next Pressing the Menu button backs the selection out to the previous level Example 1 2 From the PROGRAM REVIEW screen press the Down Arrow button to box ALARMS
49. PRB OUT relay is deactivated Ai SES te Delay occurs for resume time interval then HOLD is deactivated normal operation resumes For cleaning only or calibration only only the PRB OUT relay is used and either the calibration step 4 or the clean time step 2 are omitted respectively ADO Analyzer Pressurized Cleaning Medium Figure K 1 Automatic Cleaning and Calibration Scheme for Wastewater 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual 99
50. Pins 39 and 40 performing the ADC MAX calibration and then shorting Unit Pin 39 to Unit Pin 40 and performing the ADC ZERO calibration Calibrating the DO ranges consists of introducing 350 35 3 5 and 0 35 microamps to Unit Pins 35 and 38 performing the MAX CAL calibration for each input respectively and then introducing zero microamps to Unit Pins 35 and 38 and performing the zero calibration for each range respectively CAUTION If these calibration procedures are performed with inappropriate inputs or for instance the max cals are initiated with no input serious errors can be anticipated in all results subsequently reported Proper performance may be restored only by performing these calibrations with accurate standards If both calibrations are to be done it is convenient prior to the actual calibration to 1 Disconnect main power to the analyzer 2 Remove TB 5 3 Disconnect any leads to TBS 4 Connect short leads to TB5 Unit Pins 35 38 39 and 40 5 Plug TBS back into the analyzer 6 Restore main power to the analyzer If ADC calibration only is to be performed in Step 4 above connect short leads to TB5 Unit Pins 39 and 40 only If DO input ranges only are to be calibrated in Step 4 above connect short leads to TB5 Unit Pins 35 and 38 only Procedure for Calibrating the ADC 1 With 5 0000 volts between Unit Pin 39 and Unit Pin 40 from the MAIN MENU MAINT screen press the Down Arrow
51. RM O DO4 NC SHEILD DO5 NO Al 1 DO5 C 5a 005 NC DO5 C OOOOOOOO g OOOO0O0O000 OQ uOOOQUO DO AI 1 8 Refers to Additional Solid State Relay option Figure 3 6 Standard Label for all Terminal Block Safety Covers Terminal Board Legend R Red G Green K Black Y Yellow O Orange W White Special Wiring Considerations Terminal Boards Terminal boards provided are based on the options specified for the particular Analyzer All discrete outputs are dry contacts unpowered Power must be provided and wired in series if needed for the installation It is recommended that a power on off switch be included in the discrete output circuit to enable removal of output power while the Analyzer and input devices remain operational ATTENTION 1 When discrete outputs are wired to inductive loads such as motor starters or solenoid valves additional transient noise suppression must be provided 2 Mechanical relays are protected by RC resistance capacitance arc suppression circuits wired across their contacts When powered with AC leakage through these circuits is often sufficient to activate very small loads such as neon bulbs continuity testers PLC logic circuits etc If this AC voltage cannot be tolerated install a suitable load resistance in parallel with the small load 3 Solid state AC relays or triacs have a minimum current requirement of 20 mA to swit
52. Terminal block Terminal block subplate Replacement Kit for Single Current 2 DI Card label set Assembly instructions A fused disconnect switch to terminals to connect AC mains needed for all CE units Directions Withdrawn 7931 Dissolved Oxygen Replacement current output card Analyzer Replacement Parts Power Line Filter Kit 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual 11 The Series 7020 Dissolved Oxygen Analyzer User s Manual 7931 Series Probe Key Number ll L KEY Selection Availability NUMBER 07931 Dissolved Oxygen Probe Note 1 TABLE Materials of Construction Lead Length 316 Stainless Steel 40 316 Stainless Steel 60 TABLE Il OPTIONS Linen Customer I D Tag L Limit to 3 lines 22 spaces per line Stainless Steel Customer D Tag S Limit to 3 lines 22 spaces per line Note 1 When ordering replacement probes for ppb applications you must order one O ring Part 431082008 per probe 12 The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 A Installation 3 Installation 3 1 General Unpacking Notify the carrier and Honeywell immediately if there is visible damage Compare the contents of the Analyzer package with the packing list Notify Honeywell if there is an equipment shortage To obtain proper credit and to avoid delays do not return anything
53. and Salinity is selected the DO reading will be lower than expected Confirm current Salinity value through visual check on the front Display Press the Display button If Salinity is 0 0 and the process doesn t contain salt the value should be 0 0 A manual air calibration was done successfully The unit is displaying the expected DO value while in the process At some time period later the process s DO reading is different from the expected reading A manual air calibration is performed and the unit is again displaying the expected DO value Again at some time period later the DO reading is different from the expected reading by an amount similar to the first OFF reading Inspect ali joints in process line Follow leak detection procedure in Appendix F Wait until temperature can be more stable or repeat air calibration after both air temperature and DO reading are stable Enter the correct barometric pressure Go to Program Mode Under Auxiliary Input change value from Salinity to OFF Under Program mode under Auto Clean Calibrate turn the Auto Cal OFF Perform a manual Air Calibration Do not use probe in this application Pull probe out of process and perform air calibration in air Remove probe from process perform an air calibration and return probe to process Remove probe from process and perform an air calibration to cancel the sample calibration Remove probe from process and perform an
54. aradaic Currents Faradaic currents are those resulting from oxidation or reduction of chemical species The reduction of oxygen to water the oxidation of water to oxygen and the oxidation of hydrogen hydrazine or sulfur dioxide are examples of Faradaic currents Residual Currents Residual currents are unwanted Faradaic currents caused by impurities in the probe electrolyte These impurities are metals e g lead zinc in electrolyte reagents which are capable of being reduced at the cathode and give rise to zero offset currents at zero ppb oxygen Electrode Conditioning Currents The platinum cathode and anode materials are actually made up of conducting platinum oxides These oxides exist at the molecular level The actual platinum surface state strongly affects the observed Faradaic currents Before methods of wire conditioning were established upwards of 96 hours was needed to allow these conditioning currents to stabilize Once wire conditioning methods were established it now takes approximately 24 hours for these conditioning currents to completely stabilize Electrode conditioning currents occur on first probe power ups following power interruptions of more than 1 second battery back up is on the probe to prevent this current during a power outage and following a Probe Bias test Charging Currents The Dissolved Oxygen DO probe consists of closely spaced bi filar platinum windings separated by a high dielectric constant ma
55. blems and Solutions WARNING More than one switch may be required to de energize unit A DO reading is higher than expected Air Calibration Failed The DO reading is higher or lower than expected The DO Reading is lower than expected Air Calibration doesn t hold or DO Reading is lower than expected Flashing DO Value 25 ppm or 25 000 ppb Flashing DO Value ppm or ppb Leaks in pipe line Too windy The pressure setting may be unintentionally set to an incorrect value The Salinity may unintentionally be turned ON Auto Air Calibration may unintentionally be turned ON Probe is measuring an concentration greater than 25 ppm or 25 000 ppb Air Calibration was done in 15 20 ppm process A Probe Bias test was performed in a 0 10 ppb application A sample calibration was performed in a 0 2 ppb application An air calibration was performed in a low ppb application Chemical Interference ex Hydrazine in excess of 1 000 ppb Other Chemical Interference s Follow Probe and Analytical tests to confirm that neither are the problem Appendix B Air Calibration based on stable temperature reading Do a visual check on the front display of the analyzer Press the Display button if the Pressure value is either or gt 760 40 mmHg the pressure is incorrect Salinity is used to correct for salt in the process water If the process water doesn t contain salt
56. center of the electrode support and is also in contact with the electrolyte The anode and cathode perform oxygen generation and reduction functions while the reference electrode maintains the correct electro chemical potential Theory of Probe Operation When the probe is placed into the sample stream oxygen diffuses through the membrane and is reduced at the cathode while an equal amount of oxygen is generated at the anode The diffusion continues until the oxygen partial pressure on both sides of the membrane is equal and a balance exists The electrical circuitry is arranged such that the current necessary to maintain this equilibrium is converted to read out the dissolved oxygen concentration in the solution The reactions are as follows At cathode 0 4H 4 gt 2H 0 At anode 0 4H 4e lt 2 ATTENTION No oxygen or acid is consumed No water is produced No net reaction 2 The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Introduction 1 2 Quick Reference Do s for the 7021 or 7022 Dissolved Oxygen Analyzer l 2 Do connect the ground wire on the power line mains to the instrument earth ground Do check the key parameters on the Display screen before performing an air calibration for the first time The parameters should be within the following ranges e Pressure 760 40 mmHg e Salinity 0 0 if not being used e Temperature should be a stable reading Do run a Probe Bias Test while t
57. ch reliably If a load is used which allows less than 20 mA to flow then install a suitable resistance approximately 5000 ohms 5 watts for 120 VAC in parallel with the load 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual 21 The Series 7020 Dissolved Oxygen Analyzer User s Manual Special Wiring Considerations Probe To connect the DO probe to the Analyzer 1 Loosen the screw terminal block retaining screw and remove the block to facilitate connecting the leads Connect a dissolved oxygen probe with spade lugs to Terminal Board 5 terminals 33 38 If the terminal block is left in place during wiring take care to connect the probe leads sequentially in the order Shield red green black yellow orange since probe damage may result otherwise Disconnect in the reverse order Connect the shields of both cables together but do not earth ground them For a dissolved oxygen probe with plug connect it to the receptacle beneath the right most terminal board Separate probe leads from AC wiring Run power and auxiliary control and or alarm wiring in conduit to prevent moisture entry into the Analyzer Conduit openings are provided for this purpose If conduit is not used use appropriate cable grips seals or caulking to maintain enclosure rating Probe Noise Test 22 To assure maximum probe life there must be negligible voltage pickup on the probe leads Because this equipment is often installed near e
58. counter electrode anode Any gaseous substance which is permeable through the membrane 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual 85 The Series 7020 Dissolved Oxygen Analyzer User s Manual and is capable of being oxidized or reduced electroactive at the working electrode will interfere Cl N2H and SO are examples of interfering dissolved gases Cl 2e 2 2 2H 2 3 Reaction 2 is a reduction and hence a positive interference will be observed reaction 3 is an oxidation which will result in a negative interference All amperometric probes are subject to reduction or oxidation interference as shown above In addition to the direct interference shown in these two equations the equilibrium probe provides an additional indirect interference In normal probe operation oxygen is consumed at the working electrode and an equal amount of oxygen is produced at the counter electrode In a positive interference condition such as 2 above chlorine is reduced at the working electrode and an equivalent amount of oxygen is produced at the anode This oxygen is electroactive along with the dissolved chlorine and is a contributor to the measured current In a negative interference situation as in 3 hydrogen gas is consumed at the working electrode and the opposite reaction the reduction of water to hydrogen gas occurs at the counter electrode In this hydrogen interference mode the probe is bot
59. culation If extremely hot or cold objects are nearby provide radiant heat shielding to ensure that the analyzer stays within its ambient temperature specification Mounting 2 98 Panel mounting is illustrated in Figure 3 1 Provide the panel cutout as shown The panel may be up to 3 4 19 mm thick It is not necessary to drill holes in the panel The Analyzer slides into the cutout from the front of the panel to seat against the bezel flange In back two mounting bars which slide in grooves found on the top and bottom of the case are forced against the panel by screws at the rear Do not overtighten The Series 7020 Dissolved Oxygen Analyzer User s Manual 13 The Series 7020 Dissolved Oxygen Analyzer User s Manual them For panels thicker than 0 421 10 7 mm the mounting bars must be reversed in their grooves to allow the screws to engage adequately Where Analyzers are mounted above or below another instrument on a panel allow at least 1 1 2 38 mm between cutouts for vertical door opening and more if conduit fittings are used for wiring to the bottom Wall and pipe mounting are also illustrated in Figure 3 1 and require the separate bracket and hardware included as an option in Table II kit 084711 Pipe mounting may be on either a vertical or horizontal pipe by rotating the mounting bracket 90 degrees CAUTION Pipe mounting is not recommended on a pipe exceeding the specified vibration levels 7 679 195 06 0
60. cy to oscillate When this does occur decrease Rate to just stop the oscillation Usually Gain can be increased in small steps as Rate action is introduced because of the strong stabilizing action of Rate If Gain is too high the cycling frequency will be similar to that observed with Gain by itself above The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Operation Reset Adjustment Set Rate to zero Increase Reset in steps until an oscillation at frequency lower than the Gain cycling is observed when the setpoint is changed by 5 of its value Then decrease the Reset until the cycling stops Restore the Rate setting from above Some fine tuning beyond these values may improve control action In general the product of Rate and Reset should be less than 3 for good stability Control Action From the PROGRAM LOOP screen 1 Press the Down Arrow until CTRL ACTION is boxed 2 Press the Enter button to select 3 Press the Up or Down Arrow until the desired action DIR direct acting or REV reverse action is boxed 4 Press the Enter button to select Direct acting increases control output with increasing dissolved oxygen appropriate for oxygen scavenger feed raising deaerator vacuum etc Reverse acting decreases control output with increasing dissolved oxygen appropriate for aeration processes oxygen injection etc Analog Outputs CAT Current Adjusting Type control output provides a continuous 0 4 20 mA out
61. d Oxygen Analyzer User s Manual 51 The Series 7020 Dissolved Oxygen Analyzer User s Manual If YES is chosen the analog outputs alarm states and control output will remain constant at the values that they had when the calibration or cleaning was initiated If NO is chosen the alarms states are held but the analog outputs track their input parameters and control continues to function during the calibration and cleaning operations Discrete Input 1 DI1 is described in Section 3 Installation Closing initiates the NEXT SCHEDULED user programmed Automatic Calibration Automatic Cleaning operation Note that if either CALS CLN or CLNS CAL have been selected under AUTO CAL AUTO CLEAN and OPS OPERATION is not 1 closing may result in e An automatic calibration or e An automatic cleaning or e Both This depends on what has been programmed into AUTO CAL AUTO CLEAN and where in the cycle of OPS OPERATION the Series 7020 happens to be Thus if either CALS CLN or CLNS CAL was selected in AUTO CAL AUTO CLEAN with an OPS OPERATION value unequal to 1 care must be taken that when DII is closed the desired operation is initiated The HOLD feature as described under Setting the Hold Outputs just above Auxiliary Input 52 The Honeywell Series 7020 Dissolved Oxygen Analyzer can accept one auxiliary input The auxiliary input can be programmed to represent e Salinity e Remote Set Point RSP in units of ppm dissolved oxygen
62. dad cible se ei RE 59 Manual Calibration Units with Software Version C 3 or Higher sese 59 Calibrate Analog Inputs 5t Fe atu aei ipu E AE Ose 63 Calibr te Analog SITENE deu oig 65 Off Line DIG9nostles eere cere nace cosa nig saceiacesuotctvvssoaters an EEI AER EANAN 66 R set NEM 71 Product Information scc ptem tuts sa bi bota A cep TIE Ex 71 5 DIAGNOSTICS TROUBLESHOOTING 73 DE DTE CO eI 73 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual V 5 2 Troubleshooting Matrix of Potential Problems and Solutions 74 6 ACCESSORY AND SPARE PARTS KITS esee 77 APPENDIX NOISE 79 Hints for Reducing ede pde c d aves seva boi va e ea de eade see Seeman 79 APPENDIX B PROBE AND ANALYZER TESTS 81 Check for probe membrane leakage neret etia Ee teni E Eire la 81 Check that analyzer 15 WOLKHIB cate re Sonet ae ad erui Pp n apu Ris OE Hp UTE 81 Check that the analyzer and probe a
63. displayed equals the known sample DO concentration press the Enter button The display returns to the MANUAL CALIBRATION screen and the sample calibration is complete See Section 4 1 Numerical Values for a general description of setting values in the analyzer When sample calibration is complete return the probe to the measured sample and if the Hold button was pressed in step 2 press Hold again to release the hold function Zero Calibration 7021 PPB units only Zero calibration is available only on ppb Analyzers and allows adjustment of only 3 ppb The need for more adjustment than that may indicate an inadequate zero standard air leakage into the sample or interference from extremely high levels of oxygen scavengers CAUTION Do not perform zero calibration unless absolutely necessary and a zero standard is available which is extremely close to zero well below 1 ppb In general zero calibration is not needed The error associated with omitting zero calibration is generally less than 1 ppb while the error caused by calibrating with an inaccurate zero standard may be as much as 3 4 ppb Zero Calibration Procedure 1 2 62 Power the probe for at least one hour Press the Hold button if required The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 tA Operation Place the probe in the zero dissolved oxygen standard and wait until the display or recorded output indicates a steady reading Thi
64. e In each case the input is 4 20 mA corresponding to 1 0 40 ppt salinity 2 dissolved oxygen with the range of 0 20 000 ppb for PPB units and 0 20 ppm for PPM units or 3 0 100 of a flowmeter output respectively Auxiliary Input Programming Procedure 1 Go the MAIN MENU PROGRAM screen 2 Press the Down Arrow to box AUXILIARY INPUTS 3 Press the Enter button to select 4 The AUXILIARY INPUTS screen is displayed with AUX IN boxed and one of the choices shown at the right AUXILIARY INPUT AUX IN SAL 5 Toturn AUX IN off press the Enter button 6 Press the Up or Down Arrow to box OFF 7 Press the Enter button to select To configure the auxiliary input as salinity 1 From the AUXILIARY INPUT screen press the Enter button 2 Press the Up or Down Arrow to box SAL 3 Press the Enter button to select The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Operation A 4 20 mA input corresponding to 0 40 ppt salinity should be connected to the auxiliary input terminals 39 and 40 To configure the auxiliary input as flow 1 From the AUXILIARY INPUT screen press the Enter button 2 Press the Down or Up Arrow to box FLOW 3 Press the Enter button to select 4 Displayed is the AUXILIARY INPUT FLOW screen AUXILIARY INPUT AUXIN UX IN FLOW FLOW BIAS 0 05 FLOW MAX 100 0 Fo adjust the flow bias See Appendix A Feedforward Process Flow Input 1 Press the Down Arrow
65. e deg UR cui 9 TaxCalculate True Value secos radi EH Voir ie a qi sas quat 92 Example Calculation sicer oett ule beca cage p et RELY RE ERN 92 APPENDIX OUTPUT AUTO RANGING PPB ONLY 93 APPENDIX SUMMARY OF CAL CLEAN AND HOLD 95 aal oi TU uvm etme nem amt Mea IRA TR DAN OQ res 95 vi The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 APPENDIX J AUTOMATIC CALIBRATION IN PURE 97 APPENDIX K AUTOMATIC CLEANING AND CALIBRATION IN WASTEWATER 99 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual vii Tables Table 3 1 Recommended Minimum Wire Sizes Table 3 2 Definitions of DO Analyzer Inputs and Outputs Table 4 1 Main Menu Quickview Table 6 2 Dissolved Oxygen Solubility vs Temperature Figures Figure 1 1 Series 7020 Dissolved Oxygen Analyzer Figure 3 1 Mounting and Dimensions Figure 3 2 Noise Suppression for Optional Mechanical Relay Outputs Card Figure 3 3 Noise Suppression for Optional AC Relay triac Outputs Card Figure 3 4 AC Power Terminals Figure 3 5 View Inside Front Bezel Figure 3 6 Standard Label for all Terminal Block Safety Covers Figure 4 1 Series 7020 DO Analyzer Front Panel Figure 4 2 Display of Probe Bias Test Done in Air Figure H 6 1 Output Auto Ranging Co
66. e security press the Enter button 6 Press the Up or Down Arrow to display YES 7 Press the Enter button to select To set a MASTER CODE which secures the off line modes PROGRAM and MAINTENANCE 1 From the PGM SECURITY screen press the Down Arrow to box MASTER CODE 2 Press the Enter button to select 3 Set the desired numerical code as described in Section 4 1 2 4 Press the Enter button to select To set a CALIB CODE which secures the analog input and output calibrations in the MAINTENANCE mode 1 From the SECURITY screen press the Down Arrow to box CALIB CODE 2 Press the Enter button to select 3 Set the desired numerical code as described in Section 4 1 2 4 Press the Enter button to select With Security enabled each time an attempt is made to enter the protected screens the SECURITY ACTIVE screen is displayed SECURITY ACTIVE ENTER CODE ooo FOR ACCESS To gain access set the appropriate user configured security code and press the Enter button to select The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Operation To disable security or change the code follow the above Security Programming Procedure and enter desired selections and or code Selecting NO for ENABLE SECURITY disables both levels of security Either level may be disabled while enabling the other by programming 000 for the code for the level to be disabled Bypassing Security If security has been enabled
67. e timing of the cleaning is that programmed into the AUTO CAL AUTO CLEAN feature If HOLD OUTPUTS YES was chosen when programming the AUTO CAL AUTO CLEAN feature it applies to a gt button cleaning too 4 DOCLEAN The cleaning programmed under PROGRAM AUTO CAL AUTO CLEAN may be initiated from the ON LINE AUTOCAL STATUS screen If HOLD OUTPUTS YES was chosen when programming the AUTO CAL AUTO CLEAN feature it will apply to this cleaning too 5 Cleaning initiated by closing Discrete Input 1 Closing initiates the NEXT SCHEDULED user programmed Automatic Calibration Automatic Cleaning operation and HOLD applies if chosen in programming AUTO CAL AUTO CLEAN 6 Clean Limit Cleaning When the DO falls below the CLEAN LIM PPM value programmed under PROGRAM AUTO CAL AUTO CLEAN PPM analyzers only the cleaning but not a subsequent calibration programmed under PROGRAM AUTO CAL AUTO CLEAN is executed and if the resulting DO fails to rise above the CLEAN LIM PPM value a diagnostic AUTO CLEAN FAIL is displayed If HOLD OUTPUTS YES was chosen when programming the AUTO CAL AUTO CLEAN feature it applies to this cleaning too Calibrations ATTENTION For sample and pressure calibrations where the probe need not be removed from the sample HOLD may not be necessary 1 Manual Calibrations Manual Air Calibration Sample Calibration Zero Calibration 7021 PPB only and Pressure Calibration are selected and executed fr
68. e top of the terminal board cover and swing the cover down Remove the appropriate plug and pull wire through conduit To make installation easier loosen the screw at the bottom of the terminal board and remove the terminal block from the panel while wiring Make wiring connections per Table 3 2 Replace the terminal board in the appropriate spot on the panel and tighten the screw Repeat for each terminal board as needed Replace the terminal board cover and tighten the screw Close the front panel by pushing it down and back to align it Press in the top edge of the case first then press in the bottom and tighten the cover screws The Series 7020 Dissolved Oxygen Analyzer User s Manual 19 The Series 7020 Dissolved Oxygen Analyzer User s Manual 20 Terminal Board TBI Probe Quick Disconnect Pin Location 9 17 25 EarthGround to Unit Case Stud vorno focare O O p c vozno O Set Screw Jojo to hold up LO Terminal Safety Cover DO CONTACTS 2A 240 Safety Cover Contains Terminal Wiring Information Figure 3 5 View Inside Front Bezel The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Installation 4 m DO3 NO ANODE R DO3 REF G DO3 NC CATH K DO4 NO THERM Y DO4C THE
69. ealed at the rear with an expansion chamber to compensate for pressure changes The sensor assembly is permanently potted into the housing requiring no field replacement Operational service consists of an occasional wash to remove any large deposits at the sensor end This can usually be accomplished without removing the protective cage If the protective cage is removed for washing additional care must be exercised as the cage supplies the support for one end of the sensor assembly As the dissolved oxygen reading is virtually independent of inert fouling it is usually not necessary to clean the probe only to remove large accumulations of extraneous matter ATTENTION Extreme caution must be exercised whenever the protective cage or flow through adapters are removed or installed on a probe The sensors membrane may be damaged if these parts are not handled carefully For flow through probe application usually associated with low D O clean liquids the end protective cage is replaced by a solid end with a pipe fitting The probe is supplied with an exit fitting near the top and the liquid travels through the unit after flowing across the sensor Physically the sensor consists of three electrodes and a thermistor for temperature compensation Two multiple electrodes are interspaced on a supporting substrate and covered with an electrolyte these electrodes are connected as anode and cathode The third or reference electrode is mounted in the
70. elay From the PGM ANALOG OUTPUT screen 1 Press the Down Arrow to box OUTPUT 2 Press the Enter button to select 3 Press the Up or Down Arrow until the desired relay is boxed 4 Press the Enter button to select ATTENTION Programming a relay as a DAT analog output will 1 override any selections previously programmed for that relay and 2 make it impossible to program the relay from the program relay screen See Programming Relays above Control Loop 2 98 The Series 7020 Analyzer Controller includes a single controller which can use the dissolved oxygen measurement as input and provides a control output signal to a final control device to maintain dissolved oxygen near the setpoint Programming the controller consists of selecting and setting its type PID or ON OFF high and low input limits gain PID only reset PID only rate PID only set point Hysteresis ON OFF only and control action The only controllable parameter is dissolved oxygen ATTENTION Optional Dual Current Output card containing two additional current outputs must be chosen to execute control because the control output whether CAT or DAT must be from Analog Output 3 Control Loop Programming Procedure 1 Goto the MAIN MENU PROGRAM screen 2 Press the Down Arrow to box CONTROL LOOP 3 Press the Enter button to select 4 The PROGRAM LOOP screen is displayed with LOOP TYPE boxed PROGRAM LOOP LOOPTYPE PID HEN
71. ent Field Install at Location of Load 057334 Inductive Load 4 Present on Card Figure 3 2 Noise Suppression for Optional Mechanical Relay Outputs Card AC Load instrument Field Output Module phe Ge ee 7 Install MOV at Location of Load 411726 for 120V 057381 for 240V Inductive Load DC Load Instrument Field Module Install at 39 Ohm Location of 011127 Load 057334 Inductive Load Figure 3 3 Noise Suppression for Optional AC Relay triac Outputs Card 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual 17 The Series 7020 Dissolved Oxygen Analyzer User s Manual PE Protective Earth Ground Figure 3 4 AC Power Terminals 18 The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Installation 3 2 3 Terminal Board Connections General Procedure 2 98 Make all connections at the terminals inside the case as indicated in Table 3 2 The connections to be made are dependent on what options have been selected To avoid electrical interference with signals do not run low level signal leads inside or outside the case in close proximity to or parallel with line voltage leads or other power leads To make connections open the analyzer as follows A geese qu D O9 N A Loosen the front panel screws Pull the panel forward slightly then lift it up until it latches Loosen the screw at th
72. er to select The second RELAY TEST screen with the relay number indicated in the upper right corner and ENERGIZE RELAY boxed is displayed The Series 7020 Dissolved Oxygen Analyzer User s Manual 69 The Series 7020 Dissolved Oxygen Analyzer User s Manual 70 c DEENERGIZE RELAY 5 To energize the relay manually press Enter 6 To deenergize the relay press the Down Arrow to box DEENERGIZE RELAY and press Enter to select 7 To return to the higher level screens press the Menu button Output Test This test is performed to check the accuracy of the CAT analog outputs and consists of forcing the analog outputs to pre selected percentages of its range Procedure for performing the Output Test 1 From the OFF LINE DIAGS screen press the Down Arrow to box OUTPUT TEST and press Enter to select 2 Displayed is the OUTPUT TEST screen with ANALOG OUTPUT 1 boxed OUTPUT TEST ANALOG OUTPUT 2 ANALOG OUTPUT 3 3 Press Enter to select 4 Displayed is the second OUTPUT TEST screen with the number of the selected output in the upper right corner and SET TO 0 PCT boxed OUTPUT TEST 1 SET TO 25 PCT SET TO 50 PCT SET TO 75 PCT 5 set the output to the desired percentage of its range press the Down Arrow to box the desired percentage and press Enter to select Choices of output percentages are 0 25 50 75 and 100 Input Status Input status screen displays the live value of discrete inputs and the probe
73. es 7020 screen appears momentarily and then the MAIN MENU MAINT screen is displayed indicating that the reset is complete Product Information 2 98 Information about the Series 7020 analyzer such as the software revision may be displayed Procedure for Displaying Information 1 From the MAIN MENU MAINT screen press the Down Arrow to box MAINS FREQ 2 Press Enter to select 3 Displayed is the Series 7020 screen with product information 4 Press the Menu button to return to the MAIN MENU MAINT screen The Series 7020 Dissolved Oxygen Analyzer User s Manual 71 Diagnostics Troubleshooting 5 Diagnostics Troubleshooting 5 1 Diagnostics Significance Corrective Action BATTERY FAILED Battery is not accepting a charge Rechargeable probe battery needs replacement if message persists after a few hours of powering Analyzer CLOCK RESET Clock has lost its setting Reset time HOLD ACTIVE Alarms and Outputs are being held EXTREME PROBE Sample temperature is greater than 60 C which may shorten probe life TEMP HI PRB VOLTAGE AC voltage detected on probe leads Perform test in Appendix A PRB OUTPUT LOW Probe probably needs cleaning DO value less than DO preset value HI PROBE CURR Probe current is out of range for DO measurement This may be due to a chemical interference sulfides on the probe membrane or a failed probe Remove probe and clean with mild soap and water Rinse probe and return to proce
74. es that the setpoint rather than remote setpoint RS value is 4 00 e OUT 37 5 indicates that the control output is at 37 5 of maximum e AUTO indicates that the controller is in automatic rather than manual MAN To set the control setpoint 1 From the CONTROL TUNING screen press the Up Arrow button to box SETPOINT Press the Enter Button Adjust the value as described in Section 4 1 Numerical Values Pe cya ca Press the Enter Button Automatic Cleaning Calibration 2 98 This section describes the autoclean autocal functions that can be performed in the ONLINE mode These functions also include reviewing status and manually initiating a cleaning or calibration based on selections made in the PROGRAM mode Factory settings have automatic cleaning and calibration turned off When turned on with relay s assigned the internal clock and timers activate external devices such as solenoid valves or drive units that direct a cleaning stream or expose the probe to air on a set schedule The user must design the arrangement of all external devices to meet the application needs See Appendices A4 and A5 for suggested approaches See Section 4 for programming these operations and assigning relay s The procedure for manual initiation of cleaning and calibration is as follows 1 From the MAIN MENU ONLINE screen press the Down Arrow button until AUTOCLEAN AUTOCAL is boxed 2 Pressing the Enter button displays the AUTOCAL STATUS scree
75. esired one WITHOUT saving the newly entered selections Setting Alarm Set Points To set an alarm set point 1 From the PROGRAM ALARM screen press the Up Arrow or the Down Arrow button until SET POINT is boxed Press the Enter button The box moves to the right of SET POINT to a number with the most significant digit flashing The Series 7020 Dissolved Oxygen Analyzer User s Manual 37 The Series 7020 Dissolved Oxygen Analyzer User s Manual Relays 38 PROGRAM ALARM 1 J TYPE LOW INPUT DIS OXY SET POINT 00000 00 DEADBAND 00000 00 The desired set point may be set by following instructions for setting numerical values in the Honeywell Series 7020 analyzer in Section 4 1 2 Setting Deadband To set Deadband 1 From the PROGRAM ALARM screen press the Up or the Down Arrow button until DEADBAND is boxed 2 Press the Enter button 3 The box moves to the right from DEADBAND to either a number with the first digit flashing or to a flashing OFF 4 Press the Up Arrow until the number appears and then enter the desired DEADBAND value as described in Section 4 1 2 Deadband units are those of the Alarm Parameter Setting Delay in Seconds To set Delay in Seconds 1 From the PROGRAM ALARM screen press the Up Arrow or the Down Arrow button until DELAY IN SEC is boxed 2 Press the Enter button 3 Entering the desired value is identical to that for entering DEADBAND See Section 4 1 2 A re
76. f brackish water measurements ATTENTION Auxiliary inputs must be isolated from ground 6 The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Specifications and Model Selection Guide Analog Outputs One current output standard two additional current outputs are supplied as an option All are isolated and may be field assigned to dissolved oxygen temperature and or CAT control output Signal 0 20 or 4 20 mA front panel selectable Maximum Load 800 ohms Resolution 0 025 Isolation 200 V peak input output ATTENTION The optional Dual Current card must be chosen to execute control because the control output whether CAT or DAT must be from Analog Output 3 AO3 Discrete Inputs Two inputs from external dry no external voltage contacts to control initiation of probe cleaning or calibration sequence and for remote manual control action Discrete Outputs Two or optionally five dry no internal power applied relay contacts are field assignable for alarms with adjustable deadband and delay DAT control auto range identification or automatic cleaning calibration Two Mechanical Relays Standard Type Form C SPDT Max Switching Current 14 5 NO NC Amps 120 VAC resistive Max Switching Voltage 265 VAC Max Switching Power 200W DC 2000 VA AC Max Carrying Current 2A 250 VAC 5A 120 VAC 2A 24 VDC Three Additional Mechanical Relays Option Type 2 Form C SPDT 1 Form A SPST Max Switching V
77. g units Loop Type Trial and error tuning is the most practical and least time consuming approach in most applications This requires the user to recognize symptoms of incorrect adjustment For convenience the units used in this controller gain reset in repeats min and rate in minutes each provide greater control action with higher numerical settings Always allow sufficient time between adjustments for process conditions to stabilize and provide clear results of the last adjustment on the trend screen Gain Adjustment Set Rate to zero and Reset to 0 05 repeats min Begin with a Gain setting of 0 5 and gradually increase it until a distinct oscillation occurs when the setpoint is changed by about 5 of its value The period of oscillation will be several minutes depending on the system Note the actual frequency of this cycling Then reduce the gain just until the cycling stops If using DAT control first observe the control trend operating in manual mode to be able to distinguish any DAT cycling from actual PID control response Rate Adjustment Leave Gain as set above and Reset at 0 05 Set Rate to 0 05 minutes and change the setpoint by about 596 of its value If oscillation results and cycle frequency is higher than that noted above for high Gain the process probably has too much noise and cannot take Rate action In that case set Rate to zero Otherwise increase Rate in steps and make similar setpoint changes to reveal any tenden
78. gen gas would dry out the probe membrane One Beaker used to vent the gas sample One Dissolved Oxygen probe used to make DO measurement One Dissolved Oxygen flow through chamber provide a closed environment One Honeywell Model 7021 Dissolved Oxygen Analyzer monitors and displays DO value Oxygen Measurement Procedure 2 98 1 Connect probe and energize the electronics Allow probe to sit in tap water for 1 hour Perform an air calibration per the manual instructions Set up equipment as shown in Figure G 1 Immerse probe into sealed flow chamber and connect to wash bottle piping Auk wn Set room temperature to 25 C and sparge water with nitrogen overnight Reading should be less than 1 ppb Remove probe from flow chamber and expose to 25 C air for 2 hours e 8 Perform an air calibration 9 Return probe to flow chamber and resume nitrogen sparging 10 When analyzer indicates that DO level is below 20 ppb change gas to 250 ppm O in nitrogen Run until equilibrated 4 6 hours After equalization note barometric pressure and temperature The Series 7020 Dissolved Oxygen Analyzer User s Manual 91 The Series 7020 Dissolved Oxygen Analyzer User s Manual 11 Compare reading with calculated value To Calculate True Value Air Sat Value at T C x known gas OP Value x Barometric Pressure True Value 20 9 760 mmHg Example Calculation At 25 C using 250 ppm O in at 770 mm Hg True Value 8 24
79. h consuming and producing equal amounts of hydrogen and is operating in a hydrogen detection equilibrium mode In cases of electrochemical interference if the interference is positive dissolved oxygen will be produced at the counter electrode giving a perceived higher oxygen reading If the interference is negative dissolved hydrogen gas will be produced at the counter electrode giving a perceived zero oxygen reading Sulfite Based Zero Testing 86 Often as a quick check to determine if a DO probe can reach 0 0 ppb the user will immerse the probe in a sulfite based solution While sulfite is known to be a convenient oxygen scavenger it s effectiveness depends on factors such as temperature solution pH and trace impurities What s worse is that sulfites are produced by bubbling sulfur dioxide gas through caustic solutions Sulfur dioxide if present in solution will diffuse through the probe membrane react with the alkaline probe electrolyte to form electrolyte sulfites and produce a negative interference by the reaction SO H O SO4 2H 2e 4 As opposed to reaction 1 reaction 4 is an oxidation electrons are on the opposite sides of the equations and hence the measured current for 4 is opposite interfering the oxygen reduction signal The sum of 1 and 4 is the reaction by which sulfites scavenge oxygen namely O 25032 2S0 5 From the above discussion it is apparent that while sulfite oxygen scavengi
80. he DO to SAT When the correct selection is boxed press the Enter button to select Configuring Salinity 54 Whether or not salinity is chosen as the auxiliary input a salinity constant may be set for two purposes To allow a constant salinity correction to dissolved oxygen values where the auxiliary input is OFF FLOW or RSP To serve as the default value for salinity if the AUX IN connection is opened Procedure for Setting a Salinity Constant 1 2 3 4 Go the MAIN MENU PROGRAM screen Press the Down Arrow to box SELECT CONFIGURE SALINITY Press the Enter button to select Displayed is the CONFIGURE SALINITY screen with CONSTANT boxed The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Operation CONFIGURE SALINITY ONSTANT 0 0 5 Press the Enter button 6 Set the desired salinity value from 0 40 ppt as described in Section 4 1 2 7 Press the Enter button to select Programming Setup Buttons SET UP BUTTONS The Calibrate and Hold buttons are user programmable Pressing the Calibrate button initiates a user selected calibration operation Pressing the Hold buttons holds control outputs and alarms conditions until either e The Hold button is pressed again or e The programmed HOLD TIMEOUT time is exceeded Button Set Up Procedure 1 Go MAIN MENU PROGRAM screen 2 Press the Down Arrow to box SET UP BUTTONS 3 Press the Enter button 4 The SET UP BUTTONS screen is disp
81. he on line displays AUTO MAN Button is used to select the control mode when control is used Hold Button is used to hold alarms conditions and output signals CAL Button is used to initiate automatic probe calibration or cleaning if configured Bezel Screws provide NEMA 4X rating and access to Analyzer wiring The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 4 1 2 4 1 3 2 98 Operation Screen Movement Arrows No matter what mode or operation the analyzer is in the present dissolved oxygen concentration and other variables are displayed instantly by pressing the Display button Pressing the Display button also moves the analyzer into the ONLINE mode no matter which mode it was in The ONLINE mode is selected by pressing the Display button and then pressing the Menu button The MAIN MENU ONLINE screen is displayed A box is around SET MODE The down arrow J in the upper right corner of the screen indicates that the list of selections below MAIN MENU ONLINE is longer than the 4 items displayed on the screen MAIN MENU ONLINE 4 ONLINE ALARM DIAG SUMMARY MANUAL CALIBRATION CONTROL TUNING Press the Down Arrow button 4 times This moves the box to the previously unseen choice of AUTOCLEAN AUTOCAL MAIN MENU ONLINE 1 ALARM DIAG SUMMARY MANUAL CALIBRATION ONTRO NIN AUTOCLEAN AUTOCAL The indication in the upper right corner is now the up down arrow 1 indicating that there are items both above and
82. he probe is still in the air to determine if the probe is operating correctly Do this test after the first air calibration Display should look like Figure 4 2 Do keep the 5 conduit holes on the under side of the analyzer plugged at all times to ensure the integrity of the NEMA 4X rating Do make sure that the set screws on the front bezel panel are securely tightened to ensure integrity of the NEMA 4X rating Don ts for the 7021 or 7022 Dissolved Oxygen Analyzer 1 2 4 Don t perform a probe bias test while the probe is in ppb process water Don t perform an air calibration while the probe is in either the ppm or ppb process water Don t perform a sample calibration when the Dissolved Oxygen reading is in the 0 0 2 0 ppb range Don t measure the dissolved oxygen in gas streams or air streams This product measures dissolved oxygen in water Do s for the 7931 Dissolved Oxygen Probe 1 2 4 Do put an o ring on a new probe before it goes into a ppb application This avoids leaks Do pull the probe s stopper out when submersing a probe in a ppm application If you want to run the cable outside the conduit e Guide the probe s cable into the notched curved portion of the probe e Replace the stopper on the probe Do put the probe in process water for at least 24 hours before performing an air calibration for the first time Do connect the probe leads according to the manufacturing recommendations in the
83. he speed and direction it is moving It uses settings of Gain Reset and The Series 7020 Dissolved Oxygen Analyzer User s Manual 45 The Series 7020 Dissolved Oxygen Analyzer User s Manual 46 Rate for the three tuning parameters In addition process flow feedforward control input can supplement the normal PID action Proportional action is based on the amount of deviation It produces a control output in direct proportion to the difference between measured dissolved oxygen and the setpoint The proportional Gain is the change of control output divided by the deviation of dissolved oxygen reading It sets the basic immediate sensitivity of control action On the Honeywell analyzer the value is strokes per minute Integral or Reset action is based on a combination of the duration and amount of deviation from the setpoint Reset is needed to return the process to the control point when the load changes It does this by a persistent change of output for the duration of the time a deviation exists Reset action is defined in terms of how much of the proportional action it reproduces in a minute The units of reset are repeats min Derivative or Rate action responds to the speed and direction of the deviation It minimizes overshoot by heading off deviations as an operator would do instinctively by observing trends and anticipating their effects Thus the output is changed by an additional amount in proportion to the rate of change in deviation
84. his feature is to clean the probe once when the apparent dissolved oxygen concentration decreases below a user selected value and indicate whether this cleaning did in fact restore the probe signal to a value corresponding to a concentration higher than the CLEAN LIM DO value When the dissolved oxygen falls below the programmed CLEAN LIM PPM value a probe cleaning is initiated and the CLEAN RINSING screen appears CLEAN RINSING MAX REM STEP 22 DO 0 2 PPM TEMP 22 3 C PRESS MENU TO ABORT D PROBE OUTPUT LOW The OUTPUT LOW diagnostic message shows that the cleaning was initiated because of a low probe signal When the cleaning is complete the WAIT RESUME screen appears for the programmed resume time CLEAN WAIT RESUME MAX REM STEP 27 DO 1 4 PPM TEMP 22 4 C PRESS MENU TO ABORT D PROBE OUTPUT LOW At the end of the resume time a screen headed CLEAN COMPLETE appears momentarily and then the screen displayed just prior to the initiation of the cleaning operation appears If the cleaning did not restore the DO concentration to a value greater than the programmed CLEAN LIM PPM the diagnostic display AUTO CLEAN FAIL appears in a band at the bottom of the screen Setting the hold outputs 1 From the AUTO CAL AUTO CLEAN screen press the Down Arrow until HOLD OUTPUTS is boxed 2 Press the Enter button to select 3 Press the Down or Up Arrow to box either YES or NO 4 Press the Enter button to select The Series 7020 Dissolve
85. ift during calibration is too great a screen appears showing CALIBRATION FAILED PRESS ENTER TO RESUME If this happens try again by pushing the Enter button as directed and then pushing the Enter button again to repeat the air calibration If the second try gives the CALIBRATION FAILED message consult Section 5 Troubleshooting 6 When air calibration is complete return the probe to the process and if the Hold button was pressed in step 2 press Hold again to terminate the hold function Sample Calibration Sample calibration allows a calibration based on a known dissolved oxygen concentration It is similar to air calibration except that the known DO value may be entered Assuming an accurate reference is available use the sample calibration method rather than air calibration if any of the following conditions apply e The air is below freezing 32 F 0 C or hot above 104 F 40 C or very dry below 20 relative humidity e The probe is mounted such that it is much easier to measure the concentration of the DO in the water independently than to expose the probe to air Such mounting is not recommended but is sometimes necessary e The measurement interruption for air calibration cannot be tolerated Sample calibration is usually executed by leaving the probe in the measured sample and adjusting the analyzer to agree with the sample dissolved oxygen measured with a properly calibrated portable dissolved The Series 7020
86. ility is reduced a correction must be made when measuring brackish sea or other water containing much more than 1 ppt 1000 ppm of dissolved solids The ADO Analyzer includes a salinity correction algorithm which uses input from either a fixed value of salinity in ppt parts per thousand entered from the front panel or a 4 20 mA input signal from an external conductivity instrument which represents 0 40 ppt salinity as sodium chloride The input signal should be used in installations where the salinity is high and variable The salinity range corresponds to a conductivity range of approximately 0 68 mS cm for which the conductivity analyzer signal should be scaled If seawater is the medium and its deviation from pure sodium chloride is taken into account then a conductivity range of approximately 0 59 mS cm should be used instead The Honeywell 7082 Wide Range Conductivity Analyzer and cell are suitable for this measurement The Series 7020 Dissolved Oxygen Analyzer User s Manual 83 The Series 7020 Dissolved Oxygen Analyzer User s Manual Suspended and settled solids have negligible effect on solubility but may affect the transfer rate of oxygen when in excess of 2 84 The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Appendix D Discussion on Chemical Interferences on Measured DO Currents Appendix D Discussion on Chemical Interferences on Measured DO Currents There are four contributors to measured current F
87. ing of the unit and the new values have not yet been stored a screen headed PRESS ENTER TO SAVE is displayed If the old value should be retained press the Display button again If the new value should be saved press the Enter button first and then the Display button 4 3 1 On Line Mode Alarm Diagnostic Summary 2 98 From the MAIN MENU ONLINE screen press the Down Arrow and Enter buttons to display the ALARM DIAG SUMMARY screen with ALARM SUMMARY boxed ALARM DIAG SUMMARY ALARM HISTORY DIAG SUMMARY AIR CAL CURR 93 657 The following screens can be viewed from the ALARM DIAG SUMMARY screen 1 Alarm Summary To review a summary of present alarms press the Enter button To return to the ALARM DIAG SUMMARY screen press the Menu button 2 Alarm History To review a history of alarms press the Down Arrow button to move the box to ALARM HISTORY and press the Enter button To return to the ALARM DIAG SUMMARY screen press the Menu button 3 Diagnostic Summary To review a list of all diagnostic messages since the last time DELETE DIAGS was pressed press the Down Arrow button until DIAG SUMMARY is boxed and press the Enter button To return to the ALARM DIAG SUMMARY screen press the Menu button The AIR CAL CURR value is the probe current at the end of the last air calibration in microamps It is displayed in the ALARM DIAG SUMMARY screen for convenience in checking the performance of the probe To delete the present li
88. ired more frequently than cleaning then CALS CLN should be chosen If cleaning is required more frequently than calibration then CLNS CAL should be chosen If calibrations and cleanings require the same frequency then either CALS CLN or CLNS CAL may be chosen and the value of 1 selected in OPS OPERATION Setting Operations per Operation OPS OPERATIONS From the AUTO CAL AUTO CLEAN screen 1 Press the Down Arrow to box OPS OPERATION 2 Press the Enter button to select 3 Setthe desired operations per operation as described in Section 4 1 2 4 Press the Enter button to select Setting the Frequency with which the Auto Cal Auto Clean is initiated There are two ways to set the frequency of operation In the first the SEQUENCE of Daily Weekly or Monthly is selected In the second a PERIOD of less than 24 hours may be set If SEQUENCE is selected the time selected MONTHLY WEEKLY or DAILY is the time between most frequent operations For instance if the selection of MONTHLY were selected a calibration would be performed each month on the chosen day and time but a cleaning would be executed only every other month Note also that if month days 29 30 or 31 are chosen operations are not performed on months without those days If you want an operation to occur every month do not select a day higher than 28 Setting the Sequence From the AUTO CAL AUTO CLEAN screen Press the Down Arrow to box SEQUENCE 2 Press the Enter button to
89. itional Mechanical Relays Available on all 7020 DO Analyzers New Replacement Kit for Input circuit Card Available on all 7020 DO Analyzers 51198079 501 079163 Power Line Filter Kit Rabo Fas 51198077 501 New Replacement Kit for Terminal Block on all Terminal Block 7020 DO Analyzers Terminal Block Subplate Quanity Screws 4 40 x 1 75 front panel hold down O ring for front panel amp screw retention Gasket front bezel Pivot arm linkage set for front panel assembly Washer to mount standoff amp ground nuts Lock washer to mount standoff amp ground nuts Ground nut M3 Flex ribbon cable at rear ground strip rear Pins rear cover locating Gasket rear cover Screws rear cover Cover amp screw for terminal block safety Label set for above Stand off accepts safety cover screen Cover rear Gasket rear cover Screws rear cover Pins rear cover locating 3 AC SS Relay Output Card Rear Terminal Block 8 POS Terminal block Subplate Label Set Assembly Directions 3 Mech Relay Output Card Rear Terminal Block 8 POS Terminal Block Subplate Label Set Assembly Directions Display Assembly Pivot Arm Linkage O ring Screws SS four 40X1 75 Assembly Directions 2 Additionai Current Outputs Rear Terminal Block 8 POS Terminal Block Subplate Label Set Assembly Directions 10 W Power Supply Relay Card Terminal Block Terminal Block Subplate
90. l min with no change in the DO value The Series 7020 Dissolved Oxygen Analyzer User s Manual 89 Appendix G Procedure for Low Level ppb Dissolved Oxygen Testing Appendix G Procedure for Low Level ppb Dissolved Oxygen Testing Overview The purpose of this procedure is two fold First using a controlled environment new probes and or analyzers can be tested to determine if each is performing correctly before being installed in field Second this procedure can be used to re test the performance of an existing analyzer and or probe You may choose to use this set up for a zero calibration test However a zero calibration test would require as a minimum modifications to two of the test parameters One modification would require a closed loop water system The sample water must be tapped directly from the customer s process water The other modification would be the gas For zero calibration a high purity nitrogen gas very expensive must be piped into the process sample Since Honeywell can neither control the quality of the gas the customer purchases nor the quality of the process water used the company will not guarantee the accuracy of the results of a zero calibration done by this modified method Equipment Needed One Tank of Oxygen in Nitrogen gas mixture One pressure regulator shutoff valve Wash bottle used to add moisture to the sample gas before the gas reaches the probe Without addition of moisture the Nitro
91. lay opens or closes electrical contacts when activated by a discrete signal such as that from an alarm The Series 7020 Analyzer contains either two or five relays depending on the options installed Programming the relays consists of selecting the relay identifying the input parameter which activates the relay and selecting whether the relay is energized when the input parameter is on or off The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 2 98 Operation ATTENTION This section deals with programming relay action from discrete inputs The relays may also be used to output a DAT control signal Programming a relay as DAT control output will 1 override any programming previously made in this programming relays section and 2 make it impossible to program the relay from the program relay screen That the relay has been dedicated as a DAT output will be revealed by the message USED BY AO DAT when programming the relay is attempted ATTENTION If the optional 3 relays Relays 3 5 have been dedicated to the Autoranging Option 7021 PPB units only See Programming Autoranging later in this section it is possible to rededicate them to some other function but then the Autoranging option does not function Also Relay 5 can not function independently of Relay 4 since terminal 12 DO4 NO is hard wired to DO5 C which has no terminal connection See Appendix Relay Programming Procedure Go to the MAIN MENU PROGRAM
92. layed with CAL BUTTON boxed AIR HOLD TIMEOUT 3 Selecting the Calibrate button function Pressing the Enter button and the Up and Down Arrows scrolls through the choices of the calibration types that can be initiated by pressing the Calibrate button IGNORE CLEAN CAL OR CLEAN CAL Pressing the Enter button with the desired selection boxed causes the initiation of the operation whenever the Calibrate button is pushed e If IGNORE is selected pushing the Calibrate button results in no action e If CLEAN is chosen executed is the cleaning programmed in AUTO CAL AUTO CLEAN e If CAL is chosen executed is the calibration programmed in AUTO CAL AUTO CLEAN e If CLEAN CAL is chosen executed is the cleaning and calibration programmed in AUTO CAL AUTO CLEAN Setting the HOLD TIMEOUT time 1 From the SET UP BUTTONS screen press the Down Arrow to box HOLD TIMEOUT 2 Press the Enter button to select 3 Setthe desired hold timeout time in minutes as described in Table 4 4 Password Security 2 98 It is possible to program the Series 7020 analyzer such that parts of its functions can be executed only by entering a user set security code There are two levels of security If security is enabled entering the Program or Maintenance modes requires the three digit Master Code if programmed If security is enabled calibrating analog inputs or analog outputs requires the three digit calibration code if programmed Either level of security
93. lectrical noise sources minimize electrical noise sources by following the procedure found in Appendix A The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Installation Table 3 2 Definitions of DO Analyzer Inputs and Outputs Terminal Board Connections Line Power L1 K 1 Mains Connections L2 W 2 If CE Unit use Power line Filter Kit part 079163 Alarms Control PORE Discrete outputs per Specifications DO1 3 4 5 or Automatic Clean Calibration DO2 6 7 8 Terminal Card Type Board Description B TB1 Standard Power TB2 Discrete outputs per Specifications Auto Ranging to DOS 9 10 11 Terminal 16 is DO5 NC and DO4 NO is internally jumpered to DO5 additional recorder Alarms DO4 12 13 14 common no terminal for use with the auto ranging indication feature Mechanica Control or DO5 15 16 12 Relays automatic Clean Calibration DO3 9 10 To use DO4 and DOS for other purposes remove the internal jumper DO4 12 13 per directions Most commonly used in power utilities e 3 DO5 15 16 12 additional AC SS AO24 17 AO2 18 Control Output 19 AO3 20 Always used as the Control output Maximum load of 800 ohms Relays m 5 Standard Probe DO Probe Input input Card Auxiliary Remote Flow Al1 39 Input input Salinity or Alt 40 Remote Setpoint d NE Protective Earth Case Stud Connect
94. liant backlighting While most the of display screens provide information only the OPERATE LOOP screen allows the setpoint to be adjusted while in automatic control or the control output to be adjusted while in manual control To adjust setpoint Depress the Display button until the Operate Loop screen is displayed Press the AUTO MAN button if necessary to place the analyzer into automatic control This is indicated by AUTO in the lower right corner of the OPERATE LOOP screen and the fact that the value to the right of SP is boxed OPERATE LOOP PV 3 39 SP OUT 33 3 DEV 0 41 AUTO To adjust output Press the AUTO MAN button if necessary to place the analyzer into manual control This is indicated by MAN in the lower right corner of the screen and the value to the right of OUT is boxed OPERATE LOOP PV 3 39 SP ai OUT DEV 0 41 MAN Pressing the Down Arrow button lowers the output and pressing the Up Arrow button raises it Programming the control loop is described in Section 4 1 2 and tuning the loop later in this Section Press the Menu button to go to the MAIN MENU ON LINE SCREEN The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Operation MAIN MENU ONLINE 4 SET MODE ONLINE ALARM DIAG SUMMARY MANUAL CALIBRATION CONTROL TUNING SET MODE ONLINE indicates that the analyzer is in the ONLINE mode 4 3 Main Menu ATTENTION If the Display button is pressed during the programm
95. llow local electrical codes for connecting safety ground and power connections Wiring CE Units Only Immunity Compliance In applications where either the input or output wiring are subject to high level electromagnetic disturbances double shielded cable with conductive fittings is recommended The input shield should be terminated at the unit to chassis earth ground Connect the AC mains through a fused disconnect switch to terminals as indicated in the instructions supplied with the Power Line Filter Kit part 079163 To ensure that the unit meets the immunity levels specified by EMC directive 89 336 EEC install power line filter kit p n 079163 Wind three turns of each wire 14 AWG maximum through the filter core for the two power and protective earth leads as illustrated in Figure 3 4 The wound filter cores shall be located external to the 9782 case within 25 cm Noise Suppression Some amount of electrical noise is present in most locations The effects of this noise on microprocessor based instruments can be severe because the circuits are complex and operate at very low power levels Because high speed interference coupled into digital logic or computing circuits can have the appearance of signals normally found in the system it is vital that such interference be kept outside the instrument Sources of electrical noise include any high voltage or high current devices especially with AC or switched DC Noise may be directly coupled as
96. lved Oxygen 9 Accessories and Replacement Parts tnter tentent tette tes 10 2931 Series PLO OG eiecit tne pater eds eU 12 INSTALLATION an ee M EIU 13 LENS ID 13 GIG C 13 Hits eleme 13 Storage and Shipment indue E RERO a ees RED cese ed RPM 13 Feri E eaque RR REL 13 sooo ts ess coh ae aia ae laa er ext Cfr sU Is E Cunt us 13 3 2 WINE S cec Eia Sae tti daa a etsi E D 15 3 2 1 General Wiring Recor imendatiols s oca ERE 15 322 POWETCODDECCODS e essere e re vier orba n tuno cdidit 15 5alely aee eie OE Rye e rp 16 Wiring CE Units Only Immunity Compliance season eto vet egi 16 The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Noise SUDDEESSID zu va Y tr on fuf brass 16 3 2 3 Terminal Board Connections eene
97. manual Don ts for the 7931 Dissolved Oxygen Probe 2 98 1 Don t remove the silicon membrane on the probe This probe does not require any internal probe maintenance therefore the membrane should never be removed Don t zero test the 7931 probe in sodium meta or bi sulfite Follow the manual s recommendation covered in Appendix G Don t store or operate probe in below freezing temperatures as it may damage the membrane Don t perform air calibration in below 0 C temperatures The Series 7020 Dissolved Oxygen Analyzer User s Manual 3 Specifications and Model Selection Guide 2 1 S 2 Specifications and Model Selection Guide pecifications Physical Power Dimensions Mounting Weight Enclosure Universal Memory Retention Fuse Rating Environmental Ranges 2 98 Temperature Limits Operating normal Operating extreme Storage Transit 5 67 x 6 67 x 7 59 144 x 144 x 192 8 mm Panel mounting cutout 5 433 x 5 433 40 039 138 x 138 mm 1 0 mm for 0 08 0 75 inch 2 19 mm thickness standard Wall and 1 2 inch NPT pipe mounting hardware supplied with MTG option 6 Ib 2 7 kg Low copper aluminum alloy case with polyester finish impact resistant polycarbonate front panel assembly and window rated NEMA 4X IP65 with proper conduit plugs and fittings Five 0 886 inch 22 5 mm conduit holes 85 265 VAC 50 60 Hz 18VA Configuration and calibration data stored
98. n AUTOCAL STATUS CLEANIN 09 19 10 AL IN 02 19 10 DO CLEAN DO CAL This example screen shows that the next automatic probe cleaning is in nine days 19 hours and 10 minutes and that the next automatic calibration is in two days 19 hours and 10 minutes A pre programmed cleaning or Air Calibration may also be initiated from this screen The Series 7020 Dissolved Oxygen Analyzer User s Manual 31 The Series 7020 Dissolved Oxygen Analyzer User s Manual 32 To initiate an Air Calibration 3 Press the Down or Up Arrow button as necessary to box DO CAL 4 Press the Enter Button A series of screens are displayed CAL START DELAY MAX REM STEP 59 DO 8 98 PPM or 8980 0 PPB TEMP 20 2 C PRESS MENU TO ABORT Where MAX REM STEP counts down for 60 seconds factory set CAL CALIBRATING MAX REM STEP 2000 DO 8 98 PPM or 8980 0 PPB TEMP 20 2 C PRESS MENU TO ABORT Where MAX REM STEP counts down until the probe current and temperature are stable or until the user set maximum calibration time is reached CAL WAIT RESUME MAX REM STEP 59 DO 8 98 PPM OR 8980 0 PPB TEMP 20 2 C PRESS MENU TO ABORT Where MAX REM STEP counts down for the user set resume time At the completion of the calibration the AUTOCAL STATUS screen returns AUTOCAL STATUS CLEANIN 09 19 7 DO CAL Or to initiate a Cleaning 3 Press the Up or Down Arrow button as necessary to box DO CLEAN 4 Press the Enter Button
99. ng can be beneficial the existence of dissolved SO gas is detrimental To further complicate the situation is the fact that at least 10 different SO Sulfite species exist in solution and that the equilibrium between these species is slow The primary parameters that establish equilibrium conditions are total sulfite concentration and pH Sodium bisulfite NaHSO3 and sodium meta bisulfite Na2S2Os are acid sulfite forms because acidity favors SO formation these materials should be avoided While sodium sulfite Na2SO3 is the best starting material before use an optimum pH of 9 10 should be obtained and divalent metal catalyst should be added to speed up that species equilibrium Testing was done at the Honeywell Engineering labs it was impossible to create a consistently optimum solution preparation for zero probe calibration using sulfites However a Honeywell proven low ppb DO test using Nitrogen another oxygen scavenger is recommended in Appendix G of this manual The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Appendix E Percent Saturation Readout Appendix E Percent Saturation Readout In some special applications it is desirable to read out in percent saturation rather than concentration These are usually in non aqueous solutions where the normal temperature compensation of the Series 7020 Analyzer for the solubility of air oxygen in water does not apply The percent saturation readout disables this solubility
100. nnections viii The Series 7020 Dissolved Oxygen Analyzer User s Manual 15 23 25 87 14 17 18 20 21 26 68 2 98 Introduction 1 Introduction 1 1 Overview Description of Analyzer The Honeywell Series 7020 Dissolved Oxygen Analyzer Figure 1 1 when used with a separately ordered 7931 probe accurately measures the concentration of dissolved oxygen in water The line powered Analyzer energizes the probe and receives dissolved oxygen and temperature signals from it The Analyzer provides for automatic or manual calibration with ambient temperature and atmospheric pressure compensation Applications include boiler water process water and wastewater monitoring and control with many unique features for enhanced performance and ease of operation in each type of installation Factory configuration of the particular analyzer model and selected options for either ppb measurements in pure water or ppm measurements in process and waste waters allow immediate startups for most installations requiring only calibration of the probe Additional features may be enabled at any time provided any required hardware options additional output signals and or relays have been specified For boiler water measurements that span several orders of magnitude in dissolved oxygen concentration the auto ranging capability of the display and output signal allows tracking startup conditions When the three optional relays are specified they may be
101. oltage 220 VDC 250 VAC Max Switching Power 60W DC 125 VA AC resistive Three Solid State AC Relays optically isolated triacs Option Type Form A SPST Max Current 2A Voltage Range 12 280 VAC Minimum Current 20mA 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual 7 The Series 7020 Dissolved Oxygen Analyzer User s Manual Default Factory Configuration mA Output 1 0 20 ppm DO 0 20 ppb DO with option 3 additional relays auto range 0 20 200 2000 20000 ppb pF sand see slay ___ 2 wow 9mm fom 8 The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Specifications and Model Selection Guide 2 3 Model Selection Guide Series 7020 Dissolved Oxygen Analyzer Key Number KEY NUMBER MEASUREMENTS Selection Availability Description Parts per Billion ppb TABLE Additional Alarm Relay and Current Outputs Additional Relays None Three SPST AC Solid State Triac Three SPDT Mechanical Additional Current None Outputs Two 0 20 or 4 20 mA TABLE II OPTIONS Pipe Mounting Kit None Pipe Mounting Kit None Linen Stainless Steel TABLE Ill Factory use ony Pe Notes 1 Auto Ranging is only available on ppb measurements 2 Number of relays required for following features One relay for Auto Calibration only Two relays for Auto Clean only Two relays for both Auto Clean Auto Calibrati
102. om the ON LINE MANUAL CALIBRATION screen See Section 4 3 Manual Calibration If HOLD action is desired during these calibrations the button must be pushed 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual 95 The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 Time Initiated Calibration The AUTO CAL AUTO CLEAN feature Cleaning and or Calibration is initiated when the programmed clock time or duration is reached If HOLD OUTPUTS YES was selected alarms and analog outputs are held at the values they had just before initiation of the operation 3 CAL button pressing the button will initiate an air calibration if programmed to do so in PROGRAM SET UP BUTTONS If HOLD OUTPUTS YES was chosen when programming the AUTO CAL AUTO CLEAN feature it applies to a CAL button calibration too 4 DO CAL The calibration programmed under PROGRAM AUTO CAL AUTO CLEAN may be initiated fro the ON LINE AUTOCAL STATUS screen If HOLD OUTPUTS YES was chosen when programming the AUTO CAL AUTO CLEAN feature it applies to this calibration too 5 Calibration initiated by closing Discrete Input 1 Closing initiates the NEXT SCHEDULED user programmed Automatic Calibration Automatic Cleaning operation and HOLD applies if chosen in programming AUTO CAL AUTO CLEAN Holds Analog Outputs and Alarm Conditions are held for any of the following actions 1 The button is pushed 2 The Program or Maintenance Modes are entered
103. on Three relays for Auto Ranging Identification Table M_ only 3 Additional Current Outputs needed for CAT Control and or Temperature Outputs Customer must supply Tagging Information Up to 3 lines allowed 22 characters for each line 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual 9 The Series 7020 Dissolved Oxygen Analyzer User s Manual Accessories and Replacement Parts Description Parts Included in Kit Kit Part Number Accessory Parts 7931 to 7020 Series Adapter Plate 046874 Operator Manual 70 82 25 66 Miscellaneous Parts Screws 4 40 x 1 75 front panel hold down 51198075 501 O ring for front panel amp screw retention 51198076 501 Gasket front bezel 51198077 501 Pivot arm linkage set for front panel assembly Washer to mount standoff amp ground nuts Lock washer to mount standoff amp ground nuts 51198078 501 51204287 501 51204288 501 Ground nut M3 Flex ribbon cable at rear 51204289 501 51204289 502 Ground strip rear Pins rear cover locating 10 The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Gasket rear cover Screws rear cover New Replacement Kit for Terminal Cover amp screw for terminal block safety Block Safety Cover Label set for above Stand off accepts safety cover screen New Replacement Kit for Terminal Terminal block Block Terminal block subplate New Replace Kit for Rear Cover Cover rear Gasket rear cover Screws rear cover Pins rear co
104. ory set delay of one minute while the C C START DELAY screen is displayed C C START DELAY MAX REM STEP 01 DO 8 61 PPM or 8614 0 PPB TEMP 23 2 C PRESS MENU TO ABORT In both of these screens MAX REM STEP is the maximum time remaining to complete the operation DO is the dissolved oxygen concentration during cleaning TEMP is temperature and the instruction PRESS MENU TO ABORT allows the operator to terminate this operation manually After the delay is complete the C C CALIBRATING screen is displayed to confirm that calibration is occurring C C CALIBRATING MAX REM STEP 1984 DO 8 61 PPM or 8614 0 PPB TEMP 23 2 C PRESS MENU TO ABORT In this screen the maximum remaining step MAX REM STEP is in seconds and starts counting down from the 2000 second upper limit for this time The calibration usually takes a minute or two so the MAX REM STEP value decreases until the Air Calibration has been completed Then the screen changes to the C C WAIT RESUME screen and the programmed time before resumption of On Line operation is counted down as the value to the right of MAX REM STEP C C WAIT RESUME MAX REM STEP 01 DO 8 61 PPM or 8614 0 PPB TEMP 23 2 C PRESS MENU TO ABORT At the completion of the WAIT to RESUME time a screen headed CC COMPLETE is displayed for a second and then the display returns to whatever online screen was being displayed before the Automatic Calibration and Cleaning operation was initiated C C COMP
105. ow or the Down Arrow button to scroll through the choices of parameters DIS OXY dissolved oxygen concentration AUTORNG automatic range PPB only RSP remote set point FLOW PCT SAT percent saturation CTRL OUT control output PRESSURE TEMP temperature or SAL salinity ATTENTION For PPM Series 7020 Analyzer autoranging is not available and should not be selected as an input parameter If AUTORNG is chosen the Series 7020 will function as if DIS OXY were chosen To select dissolved oxygen as the alarm parameter Press the Up Arrow or the Down Arrow button until DIS OXY is boxed again and press the Enter button The only change on the screen is that the box returns to the left around INPUT To select one of the other parameters from the PROGRAM ALARM screen 1 2 3 4 5 6 Press the Up Arrow or the Down Arrow button to box input Press the Enter button to select Press the Up Arrow or the Down Arrow button if necessary to box PARM Press the Enter button to select Press the Up Arrow or the Down Arrow button to box the desired parameter Press the Enter button Note that this selection is not stored until the Menu or Display button is pressed At that time a band appears at the top of the screen saying PRESS ENTER TO SAVE If the newly programmed selections are to be saved press the Enter button If the old values are to be retained press the Menu or Display button again and the screen changes to the d
106. ox ENERGIZE WHEN Press the Enter button to select Press the Up or Down Arrow to cause ON or OFF to be displayed 2 3 4 Press the Enter button to select when the desired one is displayed 5 After selecting input and when to energize press either the Menu or Display button 6 Press the Enter button when the band at the top of the screen says PRESS ENTER TO SAVE to save this new configuration of the relay Analog Outputs 40 An analog output is one of the continuously variable 0 to 20 or 4 to 20 mA current output signals Its level usually represents the value of control output signal or a measured value such as temperature pressure or dissolved oxygen concentration The Analyzer has one analog output standard and two additional outputs when that option is specified Programming the analog outputs consists of selecting an analog output defining its type CAT or DAT the input parameter that it represents and selections specific to CAT or DAT operation For CAT Current Adjusting Type selections are e Input parameter high and low scaling limits of the parameter in engineering units e High and low signal output limits typically 20 mA and either 0 or 4 mA For DAT Duration Adjusting Type or time proportioned selections are e Input parameter its high and low limits impulse time minimum on and off times e Assignment of a relay for the DAT output signal Note that if an attempt is made to program a type that has no
107. p retains existing data PRB OUT relay is deactivated Uy ee Delay occurs for resume time interval then HOLD is deactivated normal operation resumes ADO Analyzer Vent C C Probe O O Sam ple In To Drain Figure J 1 Automatic Calibration Scheme for Pure Water 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual 97 Appendix K Procedure for Low Level ppb Dissolved Oxygen Testing Appendix K Automatic Cleaning And Calibration in Wastewater The Honeywell Series 7020 Dissolved Oxygen Analyzer has unique capabilities to provide timing sequencing logic and relay activation for unattended automatic cleaning and or calibration The particular automatic maintenance function desired cleaning and or calibration and the frequency of each is user configurable The configured sequence can be initiated by the internal clock or by an external contact closure connected to as well as by the gt button on the front of the analyzer Relays must be dedicated for probe removal PRB OUT and cleaning and calibration CLN CAL from the RELAY INPUT menu The AUTO CAL AUTO CLEAN menu contains the sequence timing settings In operation the full cleaning and calibration sequence is 1 HOLD 1s activated PRB OUT and CLN CAL relays are activated for clean time duration CLN CAL relay is deactivated Calibration waits for stability and stores calibration data or times out and retains existing data
108. passes through an internal load resistence of 250 ohms The Series 7020 Dissolved Oxygen Analyzer User s Manual 24 The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Operation 4 Operation 4 1 Overview The front panel is used to view the information stored in the Analyzer To access operator information i e Dissolved Oxygen Concentration Temperature Salinity or Pressure the Display screen is used The Display screen is invoked by pressing the Display button Y To access engineering and maintenance information and functions the Main Menu screen is used The Main Menu screen is invoked by pressing the Menu Button From the Main Menu select from three modes of operation See Table 4 1 Each of these modes is used to access a specific subset of screens Each of these modes and their respective screens are discussed later in this section Table 4 1 Main Menu Quickview ONLINE PROGRAM MAINT Maintenance ALARM DIAG SUMMARY ALARM SUMMARY ALARM HISTORY DIAG SUMMARY AIR CAL CURR DEL DIAGS CONTROL TUNING GAIN RESET RATE TREND TIME TUNING TREND SETPOINT AUTO CLEAN AUTO CAL DO CLEAN DO CAL REVIEW PROGRAM ALARMS RELAYS ANALOG OUTPUTS CONTROL LOOPS AUTO CAL AUTO CLEAN SETUP BUTTONS AUXILIARY INPUTS SET CLOCK AUTO RANGE SELECT DO OR SAT CONFIGURE SALINITY ALARMS RELAYS ANALOG OUTPUTS CONTROL LOOPS AUTO CAL AUTO CLEAN SET UP BUTTONS LOCK UNLOCK SECURITY AUXILIARY INPUT
109. percent saturation rather than dissolved oxygen concentration to be displayed in most screens revealed when the Display button is pushed The concentration of oxygen dissolved in water or other liquid may be described by either dissolved oxygen DO concentration or be percent saturation The units for DO are either parts per million PPM equivalent to milligrams per liter or parts per billion PPB equivalent to micrograms per liter The units of saturation are percent where 100 saturation is equivalent to the concentration of oxygen dissolved in air saturated water For instance at 25 C and one atmosphere pressure 8 3 ppm 100 saturation Although the ppm and ppb concentration units are the most frequently used units by far saturation may be appropriate for non aqueous liquids like vegetable oil ATTENTION When SAT is chosen the DO value in PPM or PPB is still displayed in most screens including the OPERATE LOOP screen and those for Calibration Tuning Trend Programming Alarm Set Points and CLEAN LIM PPM in Autocal Autoclean See Appendix A 7 Procedure for selecting dissolved oxygen concentration units 1 oe a Go the MAIN MENU PROGRAM screen Press the Down Arrow to box SELECT DO OR SAT Press the Enter button to select Displayed is the SELECT DO or SAT screen with SELECTION boxed SELECT DO OR SAT SELECTION DO Press the Enter button to box DO or press the Up or Down Arrow button to change t
110. permanently in non volatile memory 1 amp 250V Fast Acting Type Operator Non replaceable 14 to 130 F 10 to 55 C 4 to 140 F 20 to 60 C 14 to 158 F 10 to 70 C 22 to 158 F 30 to 70 C At these temperatures the unit will display slightly degraded accuracy and display performance Relative Humidity Limits Vibration Measurement Ranges DO 7021 DO 7022 Process Temperature Atmospheric Pressure 10 90 non condensing 10 100 with sealed cable entry to case SAMA PMC 31 1 Condition 2 field mount 5 15 Hz 2mm displacement 15 15 Hz 1 g acceleration 150 200 Hz 0 5 g acceleration any range from 0 0 ppb to 25 000 ppb with autoranging of display and output any range within 0 00 to 25 00 ppm 32 140 F 0 60 C normal 500 800 mmHg with internal sensor for calibration Auxiliary Input Scaling Range one of the following Flow Remote setpoint any range within 0 100 000 engineering units same as dissolved oxygen measurement range The Series 7020 Dissolved Oxygen Analyzer User s Manual 5 The Series 7020 Dissolved Oxygen Analyzer User s Manual Salinity Sensitivity of Analyzer Accuracy Statement for the Loop ppm measurements ppb measuremOents Standards Compliance 0 40 0 ppt parts per thousand as sodium chloride 0 68 mS cm conductivity ppm measurements 0 2 ppm at calibration conditions after stabilization ppb measurements 1 of reading or 0 1 ppb
111. put signal proportional to the control action It is suitable for use with valves and metering pumps designed to provide proportional throttling action based on a current signal DAT Duration Adjusting Type or time proportioning control output provides pulsed relay contact closures with a set cycle period and with the percent ON time regulated by the proportional control action DAT control can improve on simple on off control if it can be allowed to cycle more quickly than the process dominated slow response of straight on off control DAT output is suitable for any basic on off valve blower aerator metering pump etc that can be cycled relatively frequently DAT control output must be used in conjunction with a large well mixed volume of water to provide fairly smooth control response The set impulse time in seconds determines the period over which the contacts are cycled Note that some large blower motors and pumps cannot be cycled frequently A longer impulse time and minimum on and off times may be specified to protect these DAT selection is listed under analog outputs since it uses the calculated essentially analog output of the PID controller Auto Calibrate Clean 2 98 This feature allows the automatic air calibration and or cleaning of the probe with a pre programmed frequency Note that in order to use this Auto Cal Auto Clean feature specific relays within the Honeywell Series 7020 Dissolved Oxygen Analyzer Analyzer mu
112. r Beaker C 2 Y for Venting 2 98 2 98 Appendix H Output for Auto Ranging PPB Only Appendix H Output Auto Ranging PPB Only Power plant dissolved oxygen measurements are typically in the low ppb ranges in normal operation However during startup or upset conditions much higher levels of oxygen must be removed from the system It is necessary to monitor the progress of this removal in higher ranges to know when it is possible to increase boiler temperature and pressure To provide a good resolution signal to a recorder or other data acquisition device during normal low oxygen operating conditions but still track the higher concentrations output auto ranging can be used It automatically scales the Analog Output 1 0 4 20 mA signal to represent any of 4 user configured ranges See Section 3 Programming Autoranging For example if the normal range is set up for 0 20 ppb then above 20 ppb the scaling is 0 200 above 200 the output is 0 2000 and above 2000 the output is 0 20 000 Relays DO3 DO4 DOS energize sequentially as increasing ranges are called up There is a small deadband at the changeover points to prevent excessive jumping back and forth when measurement hovers around those values The wiring to achieve auto ranging is given for a multipoint recorder in Figure H 1 In operation the selected range will be recorded on its respective recorder point which provides the identification of the scaling The
113. r 4 Pressing the Enter Button selects that parameter 5 Adjust the value as described in Section 4 1 3 Setting Numerical Values 6 Press the Enter button to indicate acceptance of the value To observe the dissolved oxygen concentration as a function of time follow the procedure listed below 1 From the CONTROL TUNING screen press the Down Arrow button to box TREND TIME 2 Press the Enter Button 3 Press the Down or Up Arrow button to set the desired span in minutes of the trend to be displayed The minimum trend time is two minutes 4 Press the Enter Button 5 Press the Down Arrow button to box TUNING TREND 6 Press the Enter Button to start the trend Displayed is a plot of the process variable dissolved oxygen concentration as a function of time with the full width of the plot corresponding to the span configured in TREND MINUTE Trend time span may be adjusted from 2 to 59 minutes A typical tuning trend screen looks like 30 The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Operation 2 38 SP 4 00 OUT 37 5 _ AUTO The span of the abscissa horizontal axis is set by the TREND MINUTE setting The ordinate range vertical axis representing the dissolved oxygen concentration is zero to 20 000 for PPB units and zero to 20 ppm for PPM units Besides the trend other information is provided at the top of the screen e The 2 38 in the upper left is the present dissolved oxygen concentration e SP 4 00 indicat
114. rammed to be the lowest range RANGE 1 to be the next highest etc Once the Autorange feature has been programmed it is necessary to assure that the dedicated optional relays are programmed to operate correctly with autoranging To do so return to the RELAYS screen and program them as follows PROGRAM RELAY 3 INPUT RANGE 1 ENERGIZE WHEN ON PROGRAM RELAY 4 INPUT RANGE 2 ENERGIZE WHEN ON PROGRAM RELAY 5 INPUT RANGE 3 ENERGIZE WHEN ON RANGE 0 the lowest range is selected when all three relays are off The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Operation 4 3 3 Maintenance Mode ATTENTION Whenever the Analyzer is placed in the maintenance mode output values and alarm conditions that existed just prior to entering the maintenance mode are held until the ONLINE mode is reentered Contrast Adjust To change the screen CONTRAST ADJUST 1 n From the MAIN MENU MAINT screen press the Down Arrow to box CONTRAST ADJUST Press the Enter button to select Press the Up or Down Arrow button to adjust for desired display contrast Press the Enter button to select The MAIN MENU MAINT screen remains with CONTRAST ADJUST boxed but with the new contrast being displayed Mains Frequency This selection allows the choice of Mains Line Power frequency No adjustment is required for Mains Line voltage over the range 85 265 VAC Procedure for Selecting Mains Frequency 1 2 3 4 5
115. re working together correctly 82 APPENDIX C PARAMETERS AFFECTING DISSOLVED OXYGEN MEASUREMENTS83 PHOS SUT eee etie coed loe ROI A DAR ERO 83 5 meteo d repr Ped posta rl eid o UOS IR LE Rod t Dun 83 CY 83 APPENDIX D DISCUSSION ON CHEMICAL INTERFERENCES ON MEASURED DO CURRENTS MM 85 Parada CUTE DE vere asus oso oes nd nd deat neva cheat aa ce 85 Resid al Currents sey ond vg desc e a ancy Du AUDIRE RARE RP su esae Pilas uUo Fu AR V NER EY pua 85 Electrode Conditioning Currents Eo ATI 85 einen aeae en seats 85 Faradaic Intetfetences lu use RE 85 Sulfite Based Zero Eoi I vem iru 86 APPENDIX E PERCENT SATURATION 87 APPENDIX F LEAK DETECTION IN PPB 89 APPENDIX G PROCEDURE FOR LOW LEVEL PPB DISSOLVED OXYGEN TEES TIN Gin sda e M 91 T adici REPRE REL su T 91 Eaguipinent Needed uut pen HERD iain ses ROAD ants AT ri Moria viel o porri IRE CIN P LESEN 91 Oxygen Measurement Procedure nod RUP tabla tg e ead VIR Li
116. reen MAIN MENU PROGRAM J PROGRAM ALARMS RELAYS ANALOG OUTPUTS 2 Press the Down Arrow button to box ALARMS 3 Press the Enter button to select 4 The ALARMS screen is displayed with ALARM 1 boxed ALARMS 4 ALARM 1 ALARM 2 ALARM 3 ALARM 4 Selecting the Alarm Press to box the alarm to be configured and press the Enter button The PROGRAM ALARM screen appears PROGRAM ALARM 4 LOW INPUT DIS OXY SET POINT 2 00 DEADBAND 0 50 DELAY IN SEC 2 0 Selecting Alarms Type To select the TYPE of alarm 1 Press the Enter button 2 Choices are displayed by pressing either the Up Arrow or the Down Arrow button and include NONE HIGH LOW 3 When the desired choice is boxed press the Enter button to select the boxed choice 4 The screen returns to PROGRAM ALARM with TYPE boxed with the type just selected to the right of the box Selecting Alarm Input Parameter 1 select the PARAMETER whose value activates the alarm from the PROGRAM ALARM number screen Press the Down Arrow to box INPUT Press the Enter button to select Press the Up Arrow until PARM is boxed Press the Enter button to select Displayed is the PROGRAM ALARM screen with the last selected input parameter boxed EE EE The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 2 98 Operation PROGRAM ALARM 1 1 TYPE LOW INPUT SET POINT OU DEADBAND 0 50 DELAY IN SEC 2 0 Press the Up Arr
117. revision was made to update the Model Selection Guide in Section 2 so it reflects the latest offerings of the Series 7020 Dissolved Oxygen Analyzer 2 12 97 Changes were made to add information about calibrating Analog Outputs that was missing 3 2 98 Additions were made to the Wiring CE Units Only Immunity Compliance section including an additional graphic References Honeywell Documents The following list identifies all Honeywell documents that may be sources of reference for the material discussed in this publication Document Title ID Sampling Considerations for Equilibrium DO Sensors 70 82 58 47 Trademarks Contacts The following list identifies important contacts within Honeywell Organization Telephone Address Honeywell TAC 1 800 423 9883 Voice 1100 Virginia Drive Fort Washington PA 19034 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual iii 1 2 3 Contents INTRODUCTION Tr 1 MEI TCI o CM rm 1 2 eun eret 1 Description OF PtODe oce ue aoe Dm usi LE ed 2 Theory of Probe Opie Pale Oe aatia aod tad V du Ratte dean 2 1 2 OA A Rereren ces eo b nme ime peste erre dria acis N s DU 3 Do s for the 7021 or 7022 Dissolved Oxygen Analyzer ener enne nennt 3 Don ts for the 7021 or 7022 Dissolved Oxygen Analyzer
118. rn to the MAINT mode and press the Down Arrow to box CALIBRATE AO and press Enter to select Displayed is the CALIBRATE AO screen with AO 1 ZERO boxed CALIBRATE AO i AO 1 SPAN AO 2 ZERO AO 2 SPAN Press the Down Arrow if necessary to box the desired output limit and press Enter to select If for instance you selected AO 1 ZERO the ZERO CALIBRATE AO 1 screen would appear ZERO CALIBRATE AOI PRESS UP DOWN POSITION OFF If necessary press the Down or Up Arrow to make the output agree with its stated value for instance 4 0 mA as measured by the current meter Proceed to check and if necessary calibrate the zero and span for each analog output Off Line Diagnostics Off Line Diagnostics include the Probe Bias Test the Relay Test the Output Test and Input Status The function of each is described followed by the procedure for performing each 66 The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 2 98 Operation Procedure for Performing Off Line Diagnostics From the MAIN MENU MAINT screen press the Down Arrow to box OFF LINE DIAGS and press Enter to select The OFF LINE DIAGS screen is displayed with PROBE BIAS TEST boxed OFF LINE DIAGS PROBE BIAS TEST RELAY TEST OUTPUT TEST Probe Bias Test The dissolved oxygen probe is an electrochemical cell which produces an electric current that is directly proportional to the concentration of oxygen dissolved in the sample in which the probe tip 1
119. robe are working together correctly 82 l w per oe wem 10 11 12 13 14 15 16 If not already done connect the probe to the analyzer and power up the analyzer Put probe in a bucket of water for approx 1 hour so it can stabilize before proceeding Expose probe to ambient air for 3 5 minutes or until the temperature is stable Press the Display key on the Analyzer until the following parameters DO TEMPerature SALinity and PRESSure are showing on the analyzer s display Perform a Visual Check on these parameters while the probe is in ambient Air The Temperature is not flashing and is between 15 35 Deg C DO s Barometric Pressure is approx 760 mmHg 40 mmHg The Salinity value should be 0 0 PPT Indicates that Salinity is turned OFF If any of the above parameters are incorrect make the necessary changes to correct them so that they are as stated above Perform an air calibration When air calibration is completed look at the DO value and the Temperature on the Analyzer s display Confirm that these two parameters are correct by comparing them to values in Table 6 2 If the measured values are not similar to the table the probe is suspect call TAC for assistance With probe still in air perform a Probe Bias Test under the Maintenance Menu When completed the display should look exactly like Figure 4 2 under Probe Bias Test If it does move to Step 16 If the problem is a
120. s 1s the simplest and most commonly used method of calibration ATTENTION If Initial Installation power probe and analyzer for 24 hours before first air calibration Assure that the probe has been powered for at least one hour Press the Hold button if required Expose the probe to air or air saturated water until the temperature reading stabilizes Select MANUAL CALIBRATION from the Maintenance Menu AIR CALIBRATION 1s boxed pec Ip um The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 2 98 Operation MANUAL CALIBRATION AIRCALIBRATION SAMPLE CALIBRATION ZERO CALIBRATION PRESSURE CALIBRATION 5 Press the Enter button Displayed is a screen with the heading AIR CAL IN PROGRESS For Prom Versions Prior to C 3 AIR CAL IN PROGRESS DO 8 77 PPM OR 8774 02 PPB TEMP 20 9 PRESS MENU TO ABORT For Prom Versions C 3 or Greater AIR CAL IN PROGRESS CAL MODE PRESS MENU TO ABORT This screen remains until the Air Calibration is complete At that time the previous screen is displayed indicating that the air calibration has been completed Air Calibration is not completed until both the probe temperature and the probe signal are stable If the probe has just been removed from a sample low in dissolved oxygen or with temperature significantly different from the air temperature it takes longer to reach stability than if the probe were already near ambient conditions when calibration was initiated If the dr
121. s 7020 Analyzer has the capability for a single point of measurement and control Multiple measurements with control require additional Analyzers plus signal averaging and separate control which can be provided in a Honeywell Progeny RSX Recorder Control System Design Feedback control systems have the dissolved oxygen measurement downstream of the manipulated variable aeration rate deaeration vacuum oxygen scavenger feedrate etc Regardless of the flow the dissolved oxygen probe must see a representative sample of the process including any control action Thus the probe must not be installed downstream of an aeration basin if the flow can go to zero or it could not sense the effect of the aeration under any operating conditions The probe must be in the aeration basin in this case Control Types On Off control action provides the basic function of cycling a relay on and off as dissolved oxygen concentration goes below and above setpoint Small amounts of time delay and or hysteresis may be programmed to eliminate unwanted response to quickly varying concentration or electrical noise pickup On off control provides simple but crude control with an inevitable cycling above and below setpoint PID Proportional Integral Derivative control action provides a throttling or proportioning action based on the amount of deviation of the measured dissolved oxygen from the setpoint the length of time it has been away from the setpoint and t
122. s exactly because once any button other than the Up Arrow is pushed the OFF selection cannot be made to appear and it is necessary to return to the PROGRAM LOOP screen with the desired function boxed and start over again Application Information 2 98 Automatic control of dissolved oxygen concentration may be used in applications where a track record of reliable measurement has been achieved In applications where bio active membrane fouling air leaks into ppb samples or other interferences exist these must be corrected before entrusting the process to automatic operation Wastewater Aeration Control Schemes The on line control of aeration by dissolved oxygen DO can provide significant energy savings Turning off unnecessary aeration during low organic loading conditions can be done with no detrimental effects so long as control turns it back on when needed The DO measurement must be made at a representative location This may be near the effluent point of the aeration basin or at another point that has thorough mixing A survey of the basin should be done with a portable DO meter to establish a profile and help find an appropriate location This should be done with different aerators turned on and off if that is a part of the anticipated control strategy Another possibility is to measure DO continuously at several representative locations in the basin and average or otherwise combine the values to obtain the control parameter The Serie
123. s immersed When the probe is in air the current is identical to that produced when the probe is in air saturated water This current is a direct measurement of oxygen being consumed at one of the probe electrodes in order to consume the oxygen it is necessary to apply a negative bias voltage to the electrode where it is to be consumed Usually the probe is operated at 0 6V with respect to a reference electrode within the probe The minus sign is omitted from the screen as well as from the following discussion However in some applications the performance of the DO probe can be enhanced by using other bias voltages The purpose of this test is to evaluate whether the probe bias voltage should be adjusted Possible interference with probe performance may also be inferred from the Probe Bias Test PBT The result of the PBT is the relative probe current as a function of bias voltage When the test is initiated the bias voltage is adjusted down from its original value usually 0 6V at 10 mv sec until OV is reached Then the bias voltage is driven up to 1 0 V at 10 mv sec and finally it is driven down again until it has returned to the value it had just before the test was initiated During this voltage sweep the probe current is monitored and the graph of current as a function of voltage is displayed If during the test the probe current rises above a factory set upper limit the bias voltage is returned to its pre test value at 10 mv sec and the
124. s typically takes several hours and the final reading is on the order of 0 to 1 0 ppb From the MAIN MENU ONLINE screen press the Down Arrow button twice to select MANUAL CALIBRATION Press the Enter Button This displays the MANUAL CALIBRATION screen Press the Down Arrow button to box ZERO CALIBRATION Press the Enter button Displayed is a screen with the heading ZERO CAL IN PROGRESS This screen remains until the Zero Calibration is complete ZERO CAL IN PROGRESS DO 0 04 PPB TEMP 25 PRESS MENU TO ABORT When zero calibration is complete as indicated by the return of the MANUAL CALIBRATION screen return the probe to the measured sample 10 If the Hold button was pressed in step 2 press the Hold button again to release the hold function Pressure Calibration The concentration of oxygen dissolved in air saturated water depends on the air pressure This dependence is automatically compensated for during air calibration using a pressure sensor built into the Analyzer The purpose of the pressure calibration is to calibrate that pressure sensor However this sensor has been factory calibrated and should not require re calibration Pressure Calibration Procedure 1 gv e aie 98 a Determine the true ambient atmospheric pressure such as from a calibrated pressure transmitter or a mercury barometer Absolute barometric pressure is required not the relative pressure normally reported by the weather bureau
125. screen Press the Down Arrow to box RELAYS and press the Enter button The RELAYS screen allows the selection of the relay to be programmed RELAYS RELAY 1 RELAY 2 RELAY 3 RELAY 4 Selecting the Relay Press the Down Arrow to box the relay to be programmed and the Enter button to select Displayed is the PROGRAM RELAY screen PROGRAM RELAY 1 INPUT OFF ENERGIZE WHEN ON Turning the Relay OFF From the PROGRAM RELAY screen press the Enter button Press the Up Arrow if necessary to box OFF and the Enter button to select Turn the Relay ON and Select the Relay Parameter To select the parameter which activates the relay 1 From the PROGRAM RELAY screen press the Enter button and the Up Arrow if necessary to select PARM 2 Press the Enter button to select 3 Press the Up or Down Arrow to scroll through the choices 4 Press the Enter button when the desired choice is displayed The Series 7020 Dissolved Oxygen Analyzer User s Manual 39 The Series 7020 Dissolved Oxygen Analyzer User s Manual Choices of Relay Parameters PRB OUT probe out probe removed from sample DIAGNOST diagnostic HOLD ON hold function active ALARM 1 5 RANGE 1 3 automatic range change CLN CAL Clean and or calibrate Selecting when to Energize Whether to energize the relay when the input parameter is on or off is programmed from the PROGRAM RELAY screen using the following procedure 1 Press the Down Arrow to b
126. select 3 Press the Down or Up Arrow to box the desired selection among NONE MONTHLY WEEKLY or DAILY 4 Press the Enter button to select The screen that appears depends on the selection The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 08 2 98 Operation If NONE is selected the AUTO CAL AUTO CLEAN screen returns with SEQUENCE boxed The next step should be to set PERIOD HOURS See below If MONTHLY is selected the AUTO CAL AUTO CLEAN screen changes to add START DAY day of the month and START HOUR To set the START DAY 1 Press the Down Arrow to box START DAY 2 Press the Enter button to select 3 Press the Up or Down Arrow to box the desired day 4 Press the Enter button to select To set START HOUR 1 Press the Down Arrow to box START HOUR 2 Press the Enter button to select 3 Press the down or Up Arrow to box the desired start hour 4 Press the Enter button to select To set START MIN minutes box START MIN and proceed as with START HOUR If WEEKLY is selected the AUTO CAL AUTO CLEAN screen changes to add START DAY name of the day of the week and START HOUR To set the START DAY START HOUR and START MINUTE proceed as with the MONTHLY sequence above If DAILY is selected both the starting time and the period may be programmed To program one operation per day 1 Box SEQUENCE and press the Enter button to select Press the Up or Down Arrow to box DAIL and press the Enter button to
127. select Press the Down Arrow to box PERIOD HOURS and press the Enter button to select Press the Up or Down Arrow to box 24 and press the Enter button to select Press the Down Arrow to box PERIOD MIN and press the Enter button to select Press the Up or Down Arrow to box 00 and press the Enter button to select Press the Down Arrow to box START HOUR and press the Enter button to select NDA AR WON Press the Down or Up Arrow to box the desired hour to start the operation and press the Enter button to select 9 Press the Down Arrow to box START MIN and press the Enter button to select 10 Press the Down or Up Arrow to select the start minutes and press the Enter button to select ATTENTION If a period other than 24 hours 0 minutes is chosen the period selection overrides the daily selection To program multiple operations per day with a set start time proceed as above but the period time PERIOD HOURS plus PERIOD MINUTES must divide into 24 hours evenly To program multiple operations per day without selecting a specific start time follow the directions for Setting the Period Note that the period time must be greater than the start time or the message BLOCK PHASE GREATER THAN BLOCK PERIOD appears If it does choose either an earlier start time or a longer period such that the period time exceeds the start time The Series 7020 Dissolved Oxygen Analyzer User s Manual 49 The Series 7020 Dissolved Oxygen Anal
128. ser should determine the minimum cleaning time required to remove it and set CLEAN MIN to that value It is possible to program a cleaning time even if the operation selected is CAL only Programming this unused cleaning time can allow the manual initiation of a cleaning from the ONLINE AUTOCAL STATUS screen Refer to AUTO CLEAN AUTO CAL in the ONLINE Section 4 3 above Setting the Resume Time The Resume Time is the time that the probe is exposed to the sample after calibration or cleaning have been completed but before the HOLD function is disabled and automatic control based on measured dissolved oxygen concentration is enabled To program the Resume Time parameter 1 From the AUTO CAL AUTO CLEAN screen press the Down Arrow until RESUME MIN is boxed 2 Press the Enter button to select 3 Set the desired value as described in Section 4 1 2 The minimum Resume Time is one minute ATTENTION Note that for ppm applications such as wastewater treatment the probe generally reads the correct sample value within 2 or 3 minutes of restoring it to the sample after a calibration or cleaning cycle However it can take as much as an hour for oxygen concentration to reach a low ppb value Therefore the Resume Time chosen should be experimentally confirmed by measuring the time to final value in the specific probe location Setting the maximum time allowed for calibration This is the user selected maximum allowable time for air calibration 1
129. solution If using a Stainless Steel SS flow chamber you do not need the wire Using a DVM that can measure Mohms attach one DVM lead to the paper clip or touch side of SS flow through chamber and the other DVM lead to the cathode black lead Measure the impedance between the Cathode and the wire probe side If the probe has no leakage problem this resistance will be greater than 1 Mohm go to Step 10 If the reading is in the k ohms or ohms range there is a leak in the membrane which can cause erratic readings in the probe Stop any further testing until the probe is replaced If you are here it has been confirmed that there are no membrane leaks in the DO probe Remove the tape and wire from probe and rinse probe with tap water Go to Steps 9 16 Check that analyzer is working l 2 3 2 98 Remove power from analyzer Disconnect the probe and put the following resistor values on the terminal block of the analyzer e Jumper bare wire TB5 Anode 33 to Ref 34 e 10k resistor TB5 Ref 34 to Cathode 35 e 5k resistor across thermistor leads TB5 36 and 37 Turn analyzer back on The Series 7020 Dissolved Oxygen Analyzer User s Manual 81 The Series 7020 Dissolved Oxygen Analyzer User s Manual 4 5 If you see a reading of approximately 7 6 ppm or 7600 ppb at 25 the analyzer is working correctly If not the analyzer maybe the problem Consult Honeywell TAC for support Check that the analyzer and p
130. ss If alarm persists remove probe from process and perform a Probe Bias Test in air If the cursor is too far to the right of the horizontal portion of this curve move the cursor until it is centered on the horizontal AUTO CAL FAIL CLEAN PROBE Clean Setting one DO limit that causes a cleaning cycle to be initiated PPM units only THERMISTOR FAIL Probe temperature compensator is shorted or open Check wiring and replace probe if necessary TEMP OUT OF SPEC An air calibration was attempted while ambient temperature was lower than 0 C Air calibration unable to be done HIGH CELL VOLTAGE Input card failed it needs to be replaced portion of the curve The display should show a good DO value Clean the AUX IN LOW An auxiliary input is programmed but not connected to a 4 20 mA signal Temperature during Auto Calibration did not reach stability calibration aborted Instrument uses previous calibration values Auto clean was inadequate manual probe cleaning required See Section 4 4 Main Menu Program Programming Automatic Calibration Automatic probe and return it to the process If the alarm persists call Honeywell TAC for further assistance Either connect input to signal or turn off the auxiliary input under Program Mode 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual 73 The Series 7020 Dissolved Oxygen Analyzer User s Manual 5 2 Troubleshooting Matrix of Potential Pro
131. st be hard wired to the appropriate end devices e g solenoid valves See Appendices A 5 and A 6 Programming the feature consists of selecting the desired operation setting times and durations for the various steps of the selected operation s setting a low dissolved oxygen limit to activate cleaning and selecting whether or not to hold outputs during automatic calibration and or cleaning operations Auto Cal Auto Clean Programming Procedure 1 Goto the MAIN MENU PROGRAM screen 2 Press the Down Arrow to box AUTO CAL AUTO CLEAN 3 Press he Enter button to select 4 The AUTO CAL AUTO CLEAN screen is displayed with OPERATION boxed The Series 7020 Dissolved Oxygen Analyzer User s Manual 47 The Series 7020 Dissolved Oxygen Analyzer User s Manual 48 AUTO CAL AUTO CLEAN OPERATION CALS CLN OPS OPERATION 2 SEQUENCE WEEKLY STARTDAY SATURDAY Selecting the Operation s From this AUTO CAL AUTO CLEAN screen 1 Press the Enter button to select 2 Press the Down or Up arrow to box the desired operation 3 Press the Enter button to select Choices for the operation are OFF no automatic operation CAL calibration only CLEAN clean only CALS CLN calibrations per cleaning or CLNS CAL cleanings per calibration If the operation selected is either CALS CLN or CLNS CAL the next item in the menu is OPS OPERATION If OFF CAL or CLEAN is selected OPS OPERATION is not to be displayed If calibration is requ
132. st of diagnostic messages press the Down Arrow button to box DELETE DIAGS and press the Enter button Messages indicating the most recent alarm or diagnostic condition are also shown in a bright band near the bottom of the screen An explanation of these messages is given in Table 4 1 The Series 7020 Dissolved Oxygen Analyzer User s Manua 29 The Series 7020 Dissolved Oxygen Analyzer User s Manual Manual Calibration Units with Software Prior to Version C 3 For units with software versions prior to C 3 the Manual Calibration function is found under the On line Mode Menu Units with software versions C 3 and higher can find the Manual Calibration function under the Maintenance Mode The detailed explanation of the Manual Calibration function can be found in Section 4 3 3 Maintenance Mode Control Tuning Control Tuning allows the operator to change the control set point and the PID parameters gain reset and rate without going into the PROGRAM mode To facilitate tuning a time configurable display trend of the dissolved oxygen concentration vs time is available Procedure for Control Tuning 1 From the MAIN MENU ONLINE screen press the Down Arrow button until CONTROL TUNING 15 boxed 2 Press the Enter button to display the CONTROL TUNING screen CONTROL TUNING 4 2 0 RESET 1 000 RATE 0 50 TREND TIME 0 5 3 To adjust Gain Reset or Rate press the Down Arrow button as necessary to box the desired control paramete
133. t been installed in the Analyzer the following message will appear when the selection is entered TYPE REQUIRES HARDWARE Analog Output Programming Procedure DAT and CAT Go the MAIN MENU PROGRAM screen Press the Down Arrow to box ANALOG OUTPUTS and the Enter button to select The PGM ANALOG OUTPUT screen allows the selection of the analog output to be programmed PGM ANALOG OUTPUT OG Q ANALOG OUTPUT 2 ANALOG OUTPUT 3 The Series 7020 Dissolved Oxygen Analyzer User s Manual 2 98 Operation Selecting the Analog Output Press the Down Arrow to box the analog output to be programmed and the Enter button to select The PGM ANALOG OUTPUT screen is displayed with AO TYPE boxed If NONE has previously been selected that is all that is displayed ANALOG OUTPUT 2 4 AO TYPE NONE If CAT or DAT were previously selected the appropriate menu is displayed with AO TYPE the first item For instance for a previously programmed CAT output the screen would be ANALOG OUTPUT 1 J TYPE O TYPE CAT INPUT DIS OXY IN HI LIMIT 10 0 IN LO LIMIT 0 0 Selecting Analog Output Type 1 Press the Enter button 2 Pressthe Up or Down Arrow to box the desired analog output type 3 Press the Enter button to select Selecting the Input parameter that the Analog Output represents From the ANALOG OUTPUT screen 1 Press the Down Arrow to box INPUT Press the Enter button to select Press the Up Arrow to box P
134. technicians and must conform to national or local electrical codes 3 2 1 General Wiring Recommendations In general use stranded copper wire for electrical connections Keep in mind that the load resistance includes the interconnecting wire Twisted signal pairs and shielded cable improve noise immunity if wire routing is questionable Terminals for shield connections are provided Observe all applicable electrical codes when making power connections Unless electrical codes dictate otherwise the recommended minimum vwire size for connections is give in Table 3 1 Table 3 1 Recommended Minimum Wire Sizes Description Earth ground wire to common power supply 18 Earth ground wire to single unit 120 240 VAC mains leads Earth ground wire must have at least the same current carrying capability as mains wire DC current and voltage field wiring DC current and voltage wiring in control room Dissolved oxygen probe leads shielded Specific instructions for all wiring connections are provided in this section Dissolved oxygen probes are supplied with integral shielded cables for screw terminal or quick disconnect connection CAUTION e Always disconnect power before opening case and observe correct procedures for handling printed circuit boards and components that can be damaged by electrostatic discharge e Always replace all 5 plugs after completion of any wiring to maintain the integrity of the NEMA 4X rating 3 2 2
135. terial This is a description of a capacitor the capacitance of a DO probe is approximately 150 uF When the probe is scanned during a Probe Bias Test PBT at 10mV min a 1 5 uA charging current is observed This is equivalent to 150 ppb dissolved oxygen The purpose of the PBT is to verify the optimum operating range of the current voltage curve It further allows one to determine if a reference shift has occurred Most importantly it allows one to select to identify a new bias point if one is needed To employ this diagnostic the user should be in air or air saturated water ppm current is in uA range A PBT should not be performed in a ppb application ppb current is in nA range due to charging and electrode currents being at a maximum value uA range during one of these scans Furthermore the final current rise during the PBT produces both hydrogen and oxygen gases within the probe Time is needed before these gases can re establish equilibrium with the outside sample Therefore the PBT should be limited to air level conditions and adequate time should be allowed for probe recovery following a PBT Faradaic Interferences The DO probe responds to oxygen partial pressure as follows O 4H 4 2H O 1 Reaction 1 is a chemical reduction in which dissolved oxygen is reduced to water This reduction occurs at the working electrode commonly referred to as the cathode The equal and opposite oxidation reaction occurs at the
136. to box FLOW BIAS 2 Press the Enter button to select 3 Adjust to desired value between 0 and 0 1 as described in Section 4 1 2 4 Press the Enter button to select To adjust the maximum flow that will correspond to 20 mA 1 Press the Down Arrow to box FLOW MAX 2 Press the Enter button to select 3 Adjust to desired value between 0 and 9999999 00 as described in Section 4 1 2 4 Press the Enter button to select A 4 20 mA input corresponding to 0 100 of the flow maximum should be connected to the auxiliary input terminals 39 and 40 To configure the auxiliary input as a remote setpoint 1 From the AUXILIARY INPUT screen press the Enter button 2 Press the Down or Up Arrow to box RSP 3 Press the Enter button to select A 4 20 mA input corresponding to the control range of dissolved oxygen the value entered in PROGRAM LOOP INPUT HI above should be connected to the auxiliary input terminals 39 and 40 2 98 The Series 7020 Dissolved Oxygen Analyzer User s Manual 53 The Series 7020 Dissolved Oxygen Analyzer User s Manual ATTENTION If no input is connected to the auxiliary input terminals and AUX IN is programmed to be FLOW SAL or RSP a diagnostic AUX IN LO is seen and the value of the AUXIN parameter defaults to 100 FLOW the programmed salinity constant see CONFIGURE SALINITY below or local setpoint respectively Selecting Dissolved Oxygen or Percent Saturation This feature allows
137. ver locating New Replacement Kit for 3 Additional 3 AC SS relay output cards AC SS Relays Rear terminal block 8 POS Terminal block subplate Label set Assembly directions New Replacement Kit for 3 Additional 3 Mechanical relay output cards Mechanical Relays Rear terminal block 8 POS Terminal block subplate Label set Assembly directions Bezel Replacement Kit for PPB Units Display assembly Pivot arm linkage O ring Screws SS four 40 x 1 75 PPB Prom Assembly directions Bezel Replacement Kit for PPM Units Display assembly Pivot arm linkage O ring Screws SS four 40 x 1 75 PPM Prom Assembly directions eMe Specifications and Model Selection Guide 1 51204290 501 1 4 4 4 1 51204291 501 4 4 4 1 1 51204292 501 4 1 Label set 1 Assembly directions 1 Replacement Kit for CPU Backplane CPU backplane 1 51204293 501 Card Assembly instructions 1 New Replacement Kit for Input Circuit Input circuit card 1 51198079 501 1 1 1 1 Card Rear terminal block 8 POS 1 079163 1 Terminal block subplate 2 additional current output cards Rear terminal block 8 POS Terminal block subplate label set Assembly instructions New Replacement Kit for 2 Additional Current Outputs 10 W power supply relay card Termina block Terminal block subplate Label set Assembly directions Replacement Kit for Power Supply Card Single current 2 DI output card
138. w decreases it Furthermore holding the button longer causes the rate of change of the value to change more quickly To slow down the rate of change release and press the button again The Series 7020 Dissolved Oxygen Analyzer User s Manual 27 The Series 7020 Dissolved Oxygen Analyzer User s Manual The three types of values may be distinguished as follows 1 A Configured value has a flashing digit and pressing the Down Arrow shifts the flashing to the right 2 A Selected value has no flashing digit and no decimal place and pressing the Down Arrow decreases the value displayed 3 A Ramped value has no flashing digit but does have a decimal place and holding the Up Arrow or Down Arrow produces an increasingly rapid change in value 4 1 4 Diagnostic Messages These messages can be displayed at any time in the Alarm and Diagnostic Display area which is found at the bottom of the Analyzer screen See Figure 4 1 They are not dependent on any specific mode or function See Section 5 0 Troubleshooting for more information on diagnostics 4 2 Display Screens 28 To view display screens push the Display button Y Pushing the Display button repeatedly scrolls through screens which show the current status of dissolved oxygen concentration temperature pressure salinity control output percentage Several screens show the dissolved oxygen concentration in numerals large enough to be read 12 feet away including one display with bril
139. whichever is greater at calibration conditions after stabilization 0 2 ppm at calibration conditions after stabilization 5 of reading or 2 ppb whichever is greater at calibration conditions after stabilization These products are designed and manufactured to be in conformity with applicable U S and European CE standards for intended instrument locations The following standards and specifications are met or exceeded Case NEMA 4X IP55 Flame retardance all materials UL94 VO V1 or V2 Max Altitude Pollution Degree Installation Category Compliances 2000 m 2 II CE for EMC and Low Voltage directives 2 2 Product Feature Specifications Operator Interface Display Front Panel Security Diagnostics Probe Analyzer Analog Inputs Probe Pressure Auxiliary Input 4 20 mA 250 ohm load configurable for one of the following Back lit dot matrix liquid crystal display with up to 6 lines of text 1 second update time Pushbutton 8 sealed elastomeric buttons Two levels for configuration and operation calibration signal level temperature compensator integrity power AC noise full circuit card and memory tests clock Honeywell 7931 series with integral temperature compensator Internal sensor for atmospheric pressure compensation during air calibration Process flow for feedforward control Remote setpoint for cascade control Salinity compensation for online correction o
140. will be disabled by programming the value 000 for the code If Security is not enabled all screens and functions are available to the operator The Series 7020 Dissolved Oxygen Analyzer User s Manual 55 The Series 7020 Dissolved Oxygen Analyzer User s Manual 56 If Security is enabled and a Master Code unequal to 0 has been programmed this code must be entered to exit the On Line mode and enter either the Program or Maintenance mode The On Line mode only is accessible without the Master Code The Master Code is also required to reset the unit see under Section 4 5 Maintenance below If Security is enabled and a Calibration code unequal to 0 has been programmed this code must be entered to execute the calibration of either analog inputs or analog outputs See Section 4 5 Maintenance below Note that the codes required to enter the Maintenance Mode actions are available under the Program Security screen and serve mainly to make an operator think twice before performing these operations which may require subsequent recalibration or restarting time AUTO CAL AUTO CLEAN functions Some users may find it convenient to make the two codes identical Security Programming Procedure 1 Go the MAIN MENU PROGRAM screen 2 Press the Down Arrow to box LOCK UNLOCK SECURITY 3 Press the Enter button to select 4 The PGM SECURITY screen is displayed with ENABLE SECURITY boxed PGM SECURITY NO MASTERCODE 0 CALIBCODE 0 5 enabl
141. xecuted and holds activated It is the purpose of this appendix to summarize these Cleanings 1 Manual Cleaning The user may remove the probe from the sample to inspect and or clean it at any time Unless specific hardware is installed such as a relay contact connected from the probe mounting to one of the ADO discrete inputs the ADO analyzer will simply respond to the apparent new dissolved oxygen concentration equal to air saturation as programmed For instance if the sample DO is 2 ppm the control setpoint is 4 ppm the control output is controlling aeration and the control action is reverse aerators that were on trying to raise the DO to setpoint will turn off Furthermore any high alarms with setpoints less than the air saturation value will be activated Thus if the ADO is being used as a controller pressing the button before removing the probe would result in the recorder trace changing significantly while the probe was in the air confirming that the probe was probably at least removed from the sample if not cleaned 2 Time Initiated Cleaning The AUTO CAL AUTO CLEAN feature Cleaning and or Calibration is initiated when the programmed clock time or duration is reached If HOLD OUTPUTS YES was selected alarms and analog outputs will be held at the values they had just before initiation of the operation 3 Calibrate button pressing the button will initiate a cleaning if programmed to do so in PROGRAM SET UP BUTTONS Th
142. ying CALIBRATE IN PROGRESS is displayed for a few seconds and then the screen returns to the CALIBRATE AI screen and the 350 UA MAX calibration is complete Press the Up Arrow once to box CAL 35 UA MAX change the 350 UA input to 35 UA and press the Enter key to complete the 35 UA MAX calibration Press the Up Arrow to box CAL 3 5 UA MAX change the 35 UA input to 3 5 UA and press the Enter key to complete the 3 5 UA MAX calibration Press the Up Arrow to box CAL 3 5 UA MAX change the 3 5 UA input to 0 35 UA and press the Enter key to complete the 0 35 UA MAX calibration Disconnect the current source from Unit Pins 35 and 38 Press the Up Arrow five times to box CAL 35 UA ZERO and press the Enter key A screen displaying CALIBRATE IN PROGRESS is displayed momentarily and then the screen returns to the CALIBRATE AI screen and the CAL 35 UA ZERO is complete Press the Down Arrow to box CAL 3 5 UA ZERO and press Enter to complete the 3 5 UA ZERO calibration Press the Down Arrow to box CAL 35 UA ZERO and Enter to complete the 35 UA ZERO calibration Press the Down Arrow to box CAL 350 UA ZERO and Enter to complete the 350 UA ZERO calibration This completes the calibration of Analog Inputs AN Calibrate Analog Outputs The purpose of this test is to check the accuracy of the analog outputs and adjust the output values if necessary Required is a current or voltage meter and resistor with an overall system resolution of 0 0
143. yzer User s Manual Setting the Period This item appears only if NONE or DAILY has been chosen for the SEQUENCE If DAILY was chosen see the description of DAILY above If NONE was chosen 1 From the AUTO CAL AUTO CLEAN screen press the Down Arrow to box PERIOD HOURS 2 Usethe Up Arrow to increase or the Down Arrow to decrease the displayed number of hours 3 When the desired number of hours between operation is displayed press the Enter button to select PERIOD MIN minutes are set in an identical manner except that PERIOD MIN is boxed prior to pressing the Enter button to select The first operation occurs one period after the period has been entered If it is desired that the operations occur at set times not related to when they are programmed then see Daily multiple operations day above Setting the Cleaning Time 1 From the AUTO CAL AUTO CLEAN screen press the Down Arrow until CLEAN MIN is boxed Press the Enter button to select Set the desired value as described in Section 4 1 2 Press the Down Arrow to box CLEAN SEC Press the Enter button to select Ey cum spe coge D Set the desired value as described in Section 4 1 2 In many applications the equilibrium Honeywell Series 7020 Dissolved Oxygen Analyzer probe does not require cleaning However if a layer thick enough to affect probe response time or an oxygen consuming organism layer deposits on the probe its removal with some regularity may be required The u

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