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Great Lakes Instruments 692P Manual

Two-wire ph transmitter
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GLI_pHTransmitter_692P_om_D898
Manual No. 692P
Revision 9-898
MODEL 692P
TWO-WIRE
pH TRANSMITTER

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Jose Chavez
January 27, 2025

I can't get error 1 to reset

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1 comments:
Mr. Anderson
February 10, 2025

The provided context does not mention "Error 1" specifically. However, to reset error messages on the Great Lakes Instruments 692P, the instrument must be reset to factory-default values. This can be done by correcting the condition that caused the error, then recalibrating and reconfiguring the instrument. If the issue is related to memory loss, pressing the ENTER/CANCEL HOLD key may clear the error. If unusual conditions (such as electrical interference) alter the memory, a full reset may be required.

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Summary of Contents for Great Lakes Instruments 692P

  • Page 1 Back to MANUALS Menu GLI_pHTransmitter_692P_om_D898 Manual No. 692P Revision 9-898 MODEL 692P TWO-WIRE pH TRANSMITTER...
  • Page 2 This manual contains detailed instructions for all operating aspects of this instrument. Read Part One for a general description of the Model 692P. Part Two explains how to install and wire the instrument. To familiarize yourself with the basic operation of the 692P, read Part Three, Sections 1, 2 and 3.
  • Page 3 Back to MANUALS Menu Model 692P Rev. 9-898...

  • Page 4: Table Of Contents

    3.4 Analog Output ............15-17 3.5 Hazardous Area Wiring......... 17-18 PART THREE - OPERATION SECTION 1 OPERATING CONTROLS 1.1 Keypad Switches........... 19-22 1.2 Slide Switches............22-23 1.3 Program Jumper............24 1.4 Status Indicators ............25 SECTION 2 MEASURED VARIABLES..........25 Rev. 9-898 Model 692P...
  • Page 5 7.1 Using Range Expand Feature: Setting Low Endpoint ........41-42 Setting High Endpoint ........42-43 7.2 Using Output Hold Feature ........43 SECTION 8 USING SECURITY LOCK FEATURE 8.1 Locking Stored Values ..........43 8.2 Unlocking Stored Values..........44 Model 692P Rev. 9-898...
  • Page 6 2.1 System Diagnostic Error Messages ......52 2.2 Resetting Instrument to Factory-Default Values ..53 2.3 Isolating the Problem: Checking Electrical Connections ......53 Checking Instrument ......... 54-55 2.4 Customer Assistance ..........55-56 PART SEVEN - SPARE PARTS AND ACCESSORIES ..................57 Rev. 9-898 Model 692P...
  • Page 7 Setup Variables ........... 28 Table D Description of mV Setup Variables ....29 Table E Buffer Values for “Two-Key” Table Method ..39 Table F System Diagnostic Error Messages/Meanings ........52 Table G Troubleshooting Common Problems ....55 Model 692P Rev. 9-898...

  • Page 8: Part One - Introduction

    A lithium battery on the backside of the display board re- 1.2 Battery Backup tains all user-entered setup values for approximately one year (at 25°C), when loop power is removed. The battery's capacity is one year of backup time which can occur over a Rev. 9-898 Model 692P...

  • Page 9: Product Identification

    The serial number of your instrument is located at the top of the backside of the display module assembly (Figure 3-2). Write the serial number in the space provided below for convenient identification should technical assistance be re- quired. Serial Number Model 692P Rev. 9-898...

  • Page 10: Section 2 - Specifications

    Division 2....CSA: Class I, Div. 2 Groups A, B, C, and D Class II, Div. 2 Groups E, F, and G ♦ Maximum Loop Load (in series with 692P and power supply)..With 24 VDC supply: 400 ohms With 32 VDC supply: 800 ohms With 40 VDC supply: 1200 ohms NOTE - For long cable runs, the resistance of the wire must be considered and may decrease maximum load capability.

  • Page 11: Part Two - Installation

    Refer to Figure 2-1 for enclosure and mounting dimension details. Figure 2-2 illustrates various mounting configura- tions. Use the four stainless steel tabs to surface-mount the instrument. An optional hardware kit is required for pipe- Model 692P -10- Rev. 9-898...

  • Page 12: Figure 2-1 Enclosure Outline

    To surface mount the Model 692: 1. Place tabs in appropriate locations on back of enclosure and fasten with screws provided. 2. Position instrument on flat surface and use appropriate fasteners to secure it in place. FIGURE 2-1 Enclosure Outline Rev. 9-898 -11- Model 692P...

  • Page 13: Plugging Conduit Holes

    1. Place SWITCH 3 on back of display module assembly (Figure 3-2) in DIFF. (off/right) position and TEMP. COMP. switch to THERM. 2. Connect sensor (or interconnect cable) wires to DIFFERENTIAL SENSOR terminals on TB2 (Figure 3- 2), matching colors as indicated. Model 692P -12- Rev. 9-898...

  • Page 14: Conventional Combination Electrode

    A. Automatic  with Integral Temperature Sensor 1. The integral temperature sensor must be a 300 ohm thermistor or 1000 ohm RTD. Depending which type of sensor it is, set TEMP.COMP. switch to THERM. or RTD. position respectively. Rev. 9-898 -13- Model 692P...

  • Page 15: Table A Resistor Values For Fixed Temperature Compensation

    TEMP COMP terminals on TB6 (Fig. 3-2). The following table provides specific resistor values required for the listed fixed temperature compensation. Table A  RESISTOR VALUES FOR FIXED TEMPERATURE COMPENSATION Resistor Value Resistor Value °C °C (in ohms) (in ohms) Model 692P -14- Rev. 9-898...

  • Page 16: Indirect Hookup With Model 714 Preamp

    Thus, the current output remains the same even if the power supply voltage fluctuates or the load re- sistance changes. The current varies only with respect to the sensor signal, as long as the voltage Rev. 9-898 -15- Model 692P...
  • Page 17 16 to 40 volt range and is not adequate to power the transmitter. If, for example, the power supply voltage was 40 volts instead of 24 volts, the voltage available to power the Model 692 would be 26 volts, well within the specified range. Model 692P -16- Rev. 9-898...

  • Page 18: Hazardous Area Wiring

    Refer to the appropriate agency subheading for details. UL Classified The 692P is UL Classified as intrinsically safe in a Class I System or II, Div. 1 hazardous area (Groups A through G) only when: 1.
  • Page 19 Back to MANUALS Menu PART TWO - INSTALLATION SECTION 3 - ELECTRICAL CONNECTIONS Baseefa Approved The 692P is Baseefa Approved as intrinsically safe in a System Zone 0 or 1 hazardous area (Groups IIC through IIA) only when: 1. Using a GLI pH sensor with a model number listed on GLI control drawing number 1001X4N1266.

  • Page 20: Part Three - Operation

    ñ ñ and ï ï keys (items 3 and 4) and are entered by pressing the ENTER/CANCEL HOLD key (item 5). Any entry routine may be cancelled by pressing the EXAM/CANCEL key which also returns display to normal measurement mode. Rev. 9-898 -19- Model 692P...

  • Page 21: Figure 3-1 Keypad Switches

    0 thru 9 by holding key down. This key is used with ï ï key (item 4) to change displayed value to a new value. FIGURE 3-1 Keypad Switches Model 692P -20- Rev. 9-898...
  • Page 22 NOTE: To check the display to make sure all indi- cators light up (as shown in Figure 3-1), display the 4-20 mA output variable and press the EXAM/CANCEL key. n With display in “examination” mode: This key has no effect. Rev. 9-898 -21- Model 692P...

  • Page 23: Slide Switches

    Selects the state that the instrument will default to during an out-of-range condition due to a defective pH sensor or shorted sensor cable. The operator presets a low or high out-of-range default state. In case of failure, Model 692P -22- Rev. 9-898...
  • Page 24 RTD - Sets the 692 for use with a 1000 ohm RTD temperature sensor for automatic temperature compen- sation. THERM. - Sets the 692 for use with a 300 ohm ther- mistor temperature sensor for automatic temperature compensation (or a specific-valued resistor for fixed temperature compensation). Rev. 9-898 -23- Model 692P...

  • Page 25: Program Jumper

    CAUTION: If loop power is removed from the 692 and you disconnect the backup battery, all stored setup values will revert back to factory defaults. FIGURE 3-2 Controls on Backside of Display Module Assembly and Electrical Hookup Details Model 692P -24- Rev. 9-898...

  • Page 26: Status Indicators

    DISP VAR key sequentially displays: n pH. n Temperature in °C or °F. n The sensor's mV signal. n The 4-20 mA instrument analog output. Rev. 9-898 -25- Model 692P...

  • Page 27: Setup Variables

    Table of Descriptions When using the output hold feature, the “SIM VALUE” setup variable cannot be used or displayed (see footnote at bot- tom of chart). Model 692P -26- Rev. 9-898...

  • Page 28: Figure 3-3 Display Modes And Call-Up Chart Of Setup Variables

    OUT VALUE" EXAM/ EXAM/ EXAM/ EXAM/ CANCEL CANCEL CANCEL CANCEL NEXT "BUFFER CAL" EXAM/ CANCEL Displayed only when the output hold feature is not in use. FIGURE 3-3 Display Modes and Call-up Chart of Setup Variables Rev. 9-898 -27- Model 692P...

  • Page 29: Table B Description Of Ph Setup Variables

    Sets low calibration point for two-point “LO CAL °C 30.0 temperature calibration: VALUE” °F 32.0 86.0 32.0 Sets high calibration point for two-point “HI CAL °C 25.0 100.0 100.0 temperature calibration: VALUE” °F 77.0 212.0 212.0 Model 692P -28- Rev. 9-898...

  • Page 30: Instrument Startup

    TEMP. COMP. switch as follows: a. When using a 1000 ohm RTD, place in RTD po- sition. b. When using a 300 ohm thermistor or a fixed re- sistor, place in THERM position. Rev. 9-898 -29- Model 692P...

  • Page 31: Selecting Temperature Display Units (°C Or °F)

    5.2 or 5.3) before calibrating the 692 for pH measurement. When using a pH combination electrode with a 1000 ohm 1000 Ohm RTD RTD, always perform a two-point temperature calibration Compensation before calibrating for pH to obtain the most accurate pH readings. Model 692P -30- Rev. 9-898...

  • Page 32: Fixed Resistor Compensation

    1. Place temperature sensor in ice water. 2. Press DISP VAR key as needed to display temperature and allow display reading to stabilize. The sensor may take several minutes to attain temperature equilibrium with the solution. Rev. 9-898 -31- Model 692P...

  • Page 33: Ph Calibration 6.1 Summary Of Methods

    This completes the two-point temperature calibration. SECTION 6 - pH CALIBRATION The instrument must be calibrated periodically with pH buffer solution(s) to maintain measurement accuracy. It is highly recommended to establish a maintenance program to Model 692P -32- Rev. 9-898...

  • Page 34: Conventional Single-Point Method

    1. With display in pH measuring mode, place clean sensor, with protective caps removed, in the known buffer. Allow display reading to stabilize. The sensor may take sev- eral minutes attaining temperature equilibrium with the buffer. Rev. 9-898 -33- Model 692P...

  • Page 35: Two-Point Method

    3. Press NEXT key once to make display indicate pH “LO CAL VALUE.” 4. Use ï ï and ñ ñ keys to make display indicate the value of the lower pH buffer (from table on buffer bottle). Model 692P -34- Rev. 9-898...

  • Page 36: Two-Key" Two-Point Method

    Two-Point Method has been replaced. Thereafter, you can use the “two-key” two-point method, but first a qualified person must: n Set the instrument for this method. Rev. 9-898 -35- Model 692P...

  • Page 37: Selecting This Method

    LO BUFFER VALUE is less than 2.00 pH units). 7. Press EXAM/CANCEL key to return display to pH measuring mode. Performing Calibration Use this “two-key” two-point method to calibrate the instru- ment after both calibration points have been entered. This Model 692P -36- Rev. 9-898...
  • Page 38 If not, the display flashes “HI/LO ERROR.” n This calibration point is at least 2.00 pH away from the other calibration point. If not, the display flashes “BUFFER VALUE ERROR.” When these conditions are met, the display flashes “OK” Rev. 9-898 -37- Model 692P...
  • Page 39 Select and enter one or two pH buffer values from the buffer table to be used as the calibration point(s). Thereafter, the instrument can be periodically calibrated using the procedure described under the “Performing Cali- bration” subheading beginning on page 40. Model 692P -38- Rev. 9-898...

  • Page 40: Two-Key" Table Method

    *Indicates default values for LO and HI BUFFER VALUES. 2. Press NEXT key until display indicates “LO BUFFER VALUE.” 3. Use ï ï and ñ ñ keys to make display indicate the de- sired value for the single or lower calibration point. Rev. 9-898 -39- Model 692P...

  • Page 41: Performing Calibration

    The operator need not know which buffer it is, but it must be one of the entered buffers selected from the table. 2. With display in pH measuring mode, press BEGIN CAL key. Model 692P -40- Rev. 9-898...

  • Page 42: Output Setup

    4 mA and 20 mA is desired. Note these important points: n The desired segment, represented by the 4-20 mA output, cannot be smaller than 1.00 pH unit. Rev. 9-898 -41- Model 692P...

  • Page 43: Setting High Endpoint

    2. Use ï ï and ñ ñ keys to make display indicate the high endpoint at which 20 mA is to be provided (10.00 pH for this example). NOTE: Entry value must be at least 1.00 pH unit away from LO OUT VALUE. Model 692P -42- Rev. 9-898...

  • Page 44: Using Output Hold Feature

    “0001.” 4. Press ENTER key to enter lock code (LOCK status indi- cator appears and display flashes “OK” to confirm code entry). 5. Press EXAM/CANCEL key to return display to pH measuring mode. Rev. 9-898 -43- Model 692P...

  • Page 45: Unlocking Stored Values

    “1234.” 4. Press ENTER key to enter unlock code (LOCK status indicator turns off and display flashes “OK” to confirm code entry). 5. Press EXAM/CANCEL key to return display to pH measuring mode. Model 692P -44- Rev. 9-898...

  • Page 46: Part Four - Operating Aids

    To verify this, find the corresponding buffer value table Calibration on the following page and compare its pH-versus- temperature data to the data on the buffer bottle. Matching data confirms that the buffer is of the same formulation. Rev. 9-898 -45- Model 692P...
  • Page 47 9.23 9.01 9.96 9.63 9.87 10.00 Buffer 12.45 Buffer Glycol Calcium Hydroxide (DIN 19266) °C °C °C °C 10.80 9.42 13.42 11.98 10.45 9.21 13.00 11.71 10.14 9.01 12.63 11.45 9.88 8.83 12.29 9.64 8.66 Model 692P -46- Rev. 9-898...

  • Page 48: Mv Calibration

    “HI/LO ERROR” flashes if the difference between the entry value and actual measured value is greater than 50 mV. This completes the single-point mV calibration. 2.2 Two-Point Method This method requires a millivolt generator. 1. Disconnect the pH sensor or combination electrode. Rev. 9-898 -47- Model 692P...
  • Page 49 ñ ñ keys to make display indicate “180 mV.” 13. Press ENTER key to enter value (display flashes “OK” to confirm entry and returns to mV measuring mode). This completes the two-point mV calibration. Model 692P -48- Rev. 9-898...

  • Page 50: Section 3 - Simulating Measured Values

    4. Press ENTER key to enter value (“OK” flashes to con- firm entry). The loop current value changes from tracking measured pH to that which corresponds to the entered simulation value. 5. To cancel the simulation value, press EXAM/CANCEL key. Rev. 9-898 -49- Model 692P...

  • Page 51: Part Five - Principle Of Operation

    (300 ohm thermistor or 1000 ohm platinum RTD). This section converts these analog pH and tem- perature signals to digital signals for use by the microprocessor. FIGURE 5-1 Instrument Operations Block Diagram Model 692P -50- Rev. 9-898...
  • Page 52 6. The 4-20 mA analog output is controlled by the micro- processor. The output value is sent through an optical isolator for isolation and then to the digital-to-analog converter section. The analog output is isolated from the input. Rev. 9-898 -51- Model 692P...

  • Page 53: Part Six - Service And Maintenance

    (see Tables B, C, and D). Correct the condition that caused the memory loss (see Table G). Then re-calibrate (Part Three, Section 6) and reconfigure the instrument. You can clear the “Err 4” message by pressing the ENTER/CANCEL HOLD key. Model 692P -52- Rev. 9-898...

  • Page 54: Resetting Instrument To Factory-Default Values

    Checking 1. Verify that power is reaching appropriate instrument Electrical Connections terminals. 2. Push ribbon-cable connector halves together as tightly as possible. Rev. 9-898 -53- Model 692P...

  • Page 55: Checking Instrument

    7. Remove the 301 ohm resistor and millivolt generator from TB2. Reconnect the sensor directly to the instru- ment (purposely excluding interconnect cable, if used). For a combination electrode, place switches in appropri- ate positions (refer to Part Two, Section 3.2). Model 692P -54- Rev. 9-898...

  • Page 56: Customer Assistance

    8:30 a.m. 7:30 a.m. 6:30 a.m. 5:30 a.m. through Thursday 5:30 p.m. 4:30 p.m. 3:30 p.m. 2:30 p.m. 8:30 a.m. 7:30 a.m. 6:30 a.m. 5:30 a.m. Friday 4:00 p.m. 3:00 p.m. 2:00 p.m. 1:00 p.m. Rev. 9-898 -55- Model 692P...
  • Page 57 (Recommendation: Use the original GLI shipping carton or an equivalent.) Also, GLI will not accept instruments returned for repair or replacement unless they are thoroughly cleaned and all process material is removed. Model 692P -56- Rev. 9-898...

  • Page 58: Part Seven - Spare Parts And Accessories

    Model 692 label  specify for pH) ....1000G1184* * For CE-approved transmitters, specify listed part number with the suffix “-CE” added to it. Accessories Optional Input Board (retrofits transmitter for use with conventional combination electrode) ........ 692G1105 Optional Pipe-mount Kit....... 1000G3065 Rev. 9-898 -57- Model 692P...

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