7.4.5 Full scale calibration procedure (free chlorine, total
chlorine, ozone)
1. Place the sensor in the process liquid. Ensure that the pH sensor is calibrated or the
pH value is entered in case of manual pH correction, if applicable.
2. Adjust the chlorine concentration until it is near the upper end of the control range.
Wait until the reading is relatively stable before starting the calibration.
3. Press CAL on the IRC.
4. Press NEXT.
The SENSOR CAL submenu appears.
5. Press ENTER.
The TIME DELAY message appears and will remain until the sensor reading is
relatively stable. To bypass the time delay, press ENTER. The GRAB SPL prompt
appears.
6. Take a sample of the process liquid and determine the concentration of chlorine in
the sample. Press ENTER.
7. Press RESET to return to the main display.
7.4.6 Dual slope calibration (free chlorine, total chlorine)
1. Zero the sensor.
2. Place the sensor in the process liquid. Ensure that the pH sensor is calibrated or the
pH valve is entered in case of manual pH correction, if applicable.
3. Press CAL on the IRC. Press NEXT.
The SENSOR CAL prompt appears.
4. Press ENTER. The CAL PT1 prompt appears.
5. Adjust the chlorine concentration until it is near the upper end of the linear range of
the sensor. Press NEXT.
The TIME DELAY message appears and will remain until the sensor reading is
relatively stable. To bypass the time delay, press ENTER. The GRAB SPL prompt
appears.
6. Take a sample of the process liquid and determine the concentration of chlorine in
the sample.
7. Press ENTER.
The PT1 prompt appears.
8. Use the arrow keys to change the flashing display to the concentration of chlorine
determined in the grab sample. Press ENTER to save.
The CAL PT2 prompt appears.
Measurements
Instruction Manual 51
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