installation steps
1. Make a rectangular cutout in any panel with a thickness of 1/16" (1.5mm) to 3/8" (9.5mm) as shown in Figure 1.
2. Remove the mounting screws and mounting bracket from the meter's panel, and insert the panel meter into the opening (see Figure 2).
3. Slide the mounting bracket and tighten the mounting screws to secure the panel meter to the mounting panel (see Figure 3).
wiring diagram
1. Connect AC power to the rear of the meter. The AC power cord should be grounded (see Figure 4).
2. Connect a pH combination electrode with BNC connector to the INPUT (see Figure 4).
3. Connect a pt-100 ATC (Automatic Temperature Compensation) probe with two spade lug connectors to the ATC input (see Figure 4).
pH calibration
1. Clean the pH electrode and ATC probe with distilled water or buffer solution 7.00. Allow enough time for the pH electrode and ATC to reach the temperature of the buffer solution.
2. Adjust the CALIB (Position) on the front panel of the meter to the pH value of the buffer solution when the meter displays a temperature of 7.00 for the buffer solution (see Table 1 and Figure 5).
3. Clean the pH electrode and ATC probe with distilled water or the next buffer solution. Allow enough time for the pH electrode and ATC to reach the temperature of the buffer solution.
4. Adjust the SLOPE on the front panel of the meter until the meter shows the pH of the buffer solution corresponding to the temperature of buffer solution 4.01 or buffer solution 10.01 (see Table 1 and Figure 5).
5. Buffer solutions other than 4.01 and 10.01 can also be used to calibrate the slope of the meter. Verify that the reading is set to the value of the buffer that corresponds to the temperature of the buffer being used.
6. The instrument has been calibrated at two points and can be used for testing.
pH measurement
1. Calibrate the meter (see pH Calibration).
2. Clean the electrode and ATC probe with distilled water or the sample solution to be tested.
3. Immerse the electrode and ATC probe in the test solution. Allow enough time for the electrode and ATC probe to reach the temperature of the sample solution.
4. The meter displays the pH value of the test solution at the test solution temperature
4~20mA output
1. The output of the transmitter is pre-set to be 4mA at pH0.00 and 20mA at pH14.00. After measuring the output current of the transmitter, the pH value can be obtained according to the following equation: pH=(A-4)×(14/16)
Example: When A=12mA, pH=7.00
2. The maximum load of the current output is 600Ω.
output insulation
The transmitter output to ground is isolated from the pH test circuit. Since the pH test circuit is also insulated from the ground, the potential of the pH electrode input of the transmitter can be very different from the output potential of the transmitter without causing errors to the test system. For the Model 692, this voltage can be as high as 750VDC.
grounding
Even better there is a third wire from the AC power cord going to the metal meter case (see pic 4)
