JENCO 692 Operation Manual
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JENCO 692 Operation Manual

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OPERATION MANUAL
THE JENCO MODEL 692
PH TRANSMITTER
JENCO
ELECTRONICS, LTD.
MANUFACTURER OF PRECISION INSTRUMENTS

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  • Page 1 OPERATION MANUAL THE JENCO MODEL 692 PH TRANSMITTER JENCO ELECTRONICS, LTD. MANUFACTURER OF PRECISION INSTRUMENTS...
  • Page 2 INTENDED USE AND GENERAL INTRODUCTION The models 3672, 3673 and 3675 are precise instruments for the measurement and control of pH and mV (ORP). Two output relays are provided in the model 3675 for ON/OFF control. The isolated 4-20 mA output current of the model 3675 covers the input control range of 0 to 14 pH and 0 to 1400 mV.

  • Page 3: Initial Inspection

    INITIAL INSPECTION Carefully unpack the instrument and accessories. Inspect for damage in shipment. If any damage is found, NOTIFY YOUR JENCO DISTRIBUTOR IMMEDIATELY. All packing materials should be saved until satisfactory operation is confirmed.
  • Page 4 FRONT PANEL FORMAT FOR THE MODEL 3672 1. LCD display 7. pH SLOPE control 2. CONTROL SET POINT switch 8. 4-20 mA SPAN ADJUST control 3. CONTROL SET POINT LED 9. ALARM SET POINT switch 4. CONTROL SET POINT control 10.
  • Page 5 REAR PANEL FORMAT FOR THE MODELS 3672 1. pH/mV electrode BNC input 5. EARTH ground 2. ATC probe input 6. AC power input 3. Isolated 4-20 mA output 7. ALARM output relay 4. Reference electrode input 8. CONTROL output relay FIGURE 2A...
  • Page 6 FRONT PANEL FORMAT FOR THE MODEL 3673 1. LCD display 7. pH STANDARDIZATION control 2. PULSE RATE ADJUST control 8. pH SLOPE control 3. CONTROL SET POINT switch 9. DEAD AND ADJUST control 4. CONTROL SET POINT LED 10. ALARM SET POINT switch 5.
  • Page 7 REAR PANEL FORMAT FOR THE MODELS 3673 1. pH/mV electrode BNC input 5. AC power input 2. ATC probe input 6. ALARM output relay 3. Pulse frequency output 7. Reference electrode input 4. EARTH ground 8. CONTROL output relay FIGURE 2B...
  • Page 8 FRONT PANEL FORMAT FOR THE MODELS 3675 1. LCD display 6. pH SLOPE control 2. HIGH ALARM SET POINT switch 7. LOW ALARM SET POINT switch 3. HIGH ALARM SET POINT LED 8. LOW ALARM SET POINT LED 4. HIGH ALARM SET POINT control 9.
  • Page 9 REAR PANEL FORMAT FOR THE MODELS 3675 1. pH/mV. electrode BNC input 5. EARTH ground 2. ATC probe input 6. AC power input 3. Isolated 4-20 mA output 7. HIGH ALARM output relay 4. Reference electrode input 8. LOW ALARM output relay FIGURE 2C...

  • Page 10: Side View

    SIDE VIEW 1. pH/mV input BNC connector 3.pH/mV SELECT switch 2. Mounting bracket FIGURE 3...

  • Page 11: Temperature Compensation

    TEMPERATURE COMPENSATION The models 3672, 3673 and 3675 are designed to be used with a PT-100 RTD temperature probe for automatic temperature compensation, ATC, operations. The alpha value of the PT-100 element is 0.00385. A precision 0.1% resistor can be connected across the ATC input terminals to simulate a fixed process temperature.
  • Page 12 Temperature in ℃ Resistor value in Ohms 100.00 103.90 107.79 109.73 111.67 115.54 119.40 123.24 127.07 130.89 134.78 138.50 TABLE 1...
  • Page 13 REAR PANEL CONNECTION SCHEME (Refer to FIGURE 1A/1B/1C and FIGURE 2A/2B/2C) Connect the AC line to the rear terminals of the instrument. The instrument can be powered by 115 VAC or 230 VAC, 50/60 Hz. Make sure that the Earth terminal is connected to the earth lead of the AC power line.

  • Page 14: Mounting Procedure

    6.1 Combination pH (mV) electrodes Connect the pH (mV) electrode cable to the pH/mV electrode BNC input connector. 6.2 Separate pH (mV) electrodes Connect the working electrode to the pH/mV electrode BNC input connector. Connect the reference electrode to the Reference input terminal. Temperature compensation input connections 7.1 ATC mode Connect the automatic temperature compensation, ATC, probe to the ATC input...
  • Page 15 Panel Cutout FIGURE 4...
  • Page 16 Panel Meter With Mounting Bracket And Screw FIGURE 5...
  • Page 17 Mounting Method FIGURE 6...
  • Page 18 pH CALIBRATION Refer to REAR PANEL CONNECTION SCHEME, pages 11, 12. Refer to TEMPERATURE COMPENSATION, page 10. Rinse the pH electrode and ATC probe with distilled water. Measure the temperature of the buffer 7 solution with a precision thermometer. Immerse the pH electrode and ATC/TEMP probe in buffer 7. Allow sufficient time for the pH electrode and ATC probe to reach temperature equilibrium with the buffer Adjust the STAND control for the instrument to display the buffer value corresponding to the temperature measured in 2.
  • Page 19 TEMPERATURE COEFFICIENT OF THE pH BUFFERS BUFFERS ℃ 10.01 7.00 4.01 10.32 7.11 4.00 10.25 7.08 4.00 10.18 7.06 4.00 10.12 7.03 4.00 10.06 7.01 4.00 10.01 7.00 4.01 9.97 6.98 4.02 9.93 6.98 4.02 9.89 6.97 4.03 9.86 6.97 4.04 9.83 6.97...

  • Page 20: Isolation Voltage

    ISOLATION VOLTAGE The differential voltage between the outputs and the load should not exceed the maximum values. Exceeding the maximum values may cause permanent damage to the instrument and load. Relay output The maximum isolation voltage of the relay output contacts is 1500 VDC. The voltage differential between the relay output contacts and the load should not exceed 1500 VDC.
  • Page 21 CONTROLLER OUTPUT FEATURES OF THE MODEL 3672 The output of the model 3672 consists of two relays and an isolated 4-20 mA output. The isolated 4-20 mA output can be adjusted to cover input spans of 2-14 pH and 200 to 1400 mV.

  • Page 22: Isolated 4-20 Ma Output

    energized when the measured value is greater than the alarm set point value. The ALARM SET POINT LED will be OFF and the ALARM output relay will be de-energized when the measured value is less than the alarm set point value. 2.2 Set the ALARM SET POINT HIGH/LOW SELECT switch to the LOW position.
  • Page 23 measured process value. OUTPUT CURRENT SELECT switch (Refer to FIGURE 7A) 2.1 Set the OUTPUT CURRENT SELECT switch to the [LOW-HIGH] position. 2.1.1 The CONTROL SET POINT LED will be ON and the CONTROL output relay will be energized when the measured value is greater than the set point value.
  • Page 24 The SPAN ADJ control is used to set the input span corresponding to the 4-20 mA output. 3.1 Input a stable pH (mV) voltage source for the display to indicate the value corresponding to the 4 mA output. 3.2 Set the CONTROL SET POINT control for the current output to be 4 mA. 3.3 Set the OUTPUT CURRENT SELECT switch to the proper position.
  • Page 25 mV mode output The mV value can be obtained by measuring the output current, A, based on the following equation. Refer to FIGURE 7A. mV = mV (4) + (A-4) ×((mV (20) – mV(4))/16) Where: mV (4) is the mV value at 4 mA output MV (20) is the mV value at 20 mA output Example: mV (4) = 700 mV, mV (20) = 100 mV mV = 400 mV for A = 12 mA...
  • Page 27 FIGURE 7A CONTROLLER FEATURES OF THE MODEL 3673 The output of the model 3673 consists of two relays and a pulse frequency output. The operation of the 3673 is described below. (Refer to FIGURE 1B, FIGURE 2B) CONTROLLER INPUT RANGE 0 to 14.00 pH ±1999 mV PULSE FREQUENCY CONTROL...
  • Page 28 The proportional bandwidth is factory set to 2 pH (200 mV). The pulse frequency output is the antilog of the pH (mV) value within the proportional band. (Refer to FIGURE 7B) Example: Proportional band is between pH 3 and pH 5. For increasing pulse rate with increasing input pH values.

  • Page 29: Alarm Control

    process value is equal to the CONTROL SET POINT value. ALARM CONTROL ALARM set point 1.1 Press the ALARM SET POINT switch. The instrument will indicate the alarm set point value. The alarm set point value can be adjusted by the ALARM SET POINT control.
  • Page 30 The hysteresis of the model 3673 is factory set to ±0.1 pH (±10 mV). For HIGH ALARM settings, the trigger ON point is 0.1 pH (10 mV) above the set point values and the trigger OFF point is 0.1 pH (10 mV) below the set point values. For LOW ALARM settings, the trigger ON point is 0.1 pH (10 mV) below the set point values and the trigger OFF point is 0.1 pH (10 mV) above the set point values.
  • Page 31 CONTROL SET POINT value. The pulse frequency output will increase for increasing input pH (mV) values. (Refer to FIGURE 7B) 2.2 Set the PULSE FREQUENCY SELECT switch to the [HIGH-LOW] position. 2.2.1 The CONTROL SET POINT LED will be ON and the CONTROL output relay will be energized when the measured value is less than the set point value.
  • Page 32 FIGURE 7B CONTROLLER OUTPUT FEATURES OF THE MODEL 3675 The output of the model 3675 consists of two alarm relays and an isolated 4-20 mA output. The operation of the 3675 is described below. (Refer to FIGURE 1C, FIGURE 2C) CONTROLLER INPUT RANGE Relay outputs 0 to 14.00 pH...
  • Page 33 ALARM SET POINT control. 1.2 Release the HIGH ALARM SET POINT switch. The instrument will indicate the measured process value. 1.3 The HIGH ALARM SET POINT LED will be ON and the HIGH ALARM output relay will be energized when the measured value is greater than the alarm set point value.
  • Page 34 and the trigger OFF point is 0.1 pH (10 mV) below the set point values. For LOW ALARM set points, the trigger ON point is 0.1 pH (10 mV) below the set point values and the trigger OFF point is 0.1 pH (10 mV) above the set point values. ISOLATED 4-20 mA OUTPUT pH mode output The 4-20 mA output is 4 mA at 0 pH and 20 mA at 14 pH.
  • Page 35 FIGURE 7C...

  • Page 36: Warranty

    If you purchased the item from our Jenco distributors and it is under warranty, please contact them to notify us of the situation. Jenco Service Department alone will determine if the product problem is due to deviations or customer misuse.
  • Page 37 NOTE: Jenco Instruments, Inc reserves the right to make improvements in design, construction, and appearance of our products without notice. JENCO INSTRUMENTS, INC. 7968 Arjons Drive, Suite C San Diego, CA 92126 USA TEL: 858-578-2828 FAX: 858-578-2886 E-MAIL: jencoi@ix.netcom.com JENCO ELECTRONICS, LTD.

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