14
Refer to the figures on page 13 for the location of the terminal strips for connecting the sensors. The Terminal
strips are 4 pin connections. The sensors connect to pins 2 and 3. The shield wire of the sensor connects to
pin 3 and the signal wire connect to pin 2. To set a channel for pH, the 2 jumpers in the channel must be in
the UPPER position. To set a channel for ORP, the 2 jumpers in the channel must be in the DOWN position.
To calibrate the sensors, refer to the calibration section of the manual.
B. Calibration
Pressure Calibration
The pressure sensors have no calibration adjustments. Minor adjustments to zero and span can be made
using the offset and span setpoints.
Flow Calibration
The flow sensors have no calibration adjustments. Adjustments to the span can be made using the span
setpoint.
Conductivity Calibration
Each conductivity channel has an onboard span adjustment. The span adjustment is located adjacent to the
connector for the cell for each channel. The C1 adjustment is R130 and the C2 adjustment is R131. Refer to
page 5 for the location of the adjustments for each sensor.
The conductivity can be calibrated by measuring the conductivity with a known good meter and adjusting the
span adjustment for the channel to display the same reading.
pH Calibration
• To calibrate pH1
- Place the pH cell in a pH 4 buffer and allow the cell to stabilize for several minutes.
Press Function, 5 and Enter to calibrate the system to the pH 4 buffer. Remove the pH cell and rinse in
distilled water and place in a pH 7 buffer and allow to stabilize for several minutes. Press Function, 6 and
Enter to calibrate the system to the pH 7 buffer and complete the calibration procedure.
• To calibrate pH2
- Place the pH cell in a pH 4 buffer and allow the cell to stabilize for several minutes.
Press Function, 7 and Enter to calibrate the system to the pH 4 buffer. Remove the pH cell and rinse in
distilled water and place in a pH 7 buffer and allow to stabilize for several minutes. Press Function, 8 and
Enter to calibrate the system to the pH 7 buffer and complete the calibration procedure.
ORP Calibration
To calibrate the ORP sensor, connect a voltage source supplying 750mV to the terminals of the ORP sensor
to be calibrated. If there is only 1 ORP sensor, Press Function, 7 and Enter to calibrate ORP1. If there are 2
sensors, press Function, 5 and Enter to calibrate ORP1 or press Function, 7 and Enter to calibrate ORP2 .
Disconnect the voltage reference and connect the ORP cell.
C.
Control Functions
Function 1 - TANK FULL OVERRIDE
-
Allows the RO unit to run for a timed period during a tank full
condition by pressing the Function key, 1 and the Enter key.
Function 2 - MANUAL FLUSH
-
If flush is enabled, allows a flush cycle to be manually initiated by pressing
the Function key, 2 and the Enter key. If flush is already active, pressing the Function key, 2 and the Enter
key will end the flush.
Summary of Contents for 200 Series
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