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2.2. Sensor Installation and Calibration
After preparing the sensor as noted above, install the chlorine sensor in the appropriate hardware. Refer to section
3.1 of this manual for information on installing the sensor in an in-line tee or section 3.2 for information on
installing the sensor in a bypass flow chamber. If necessary, refer to section 4 of this manual for instructions on
wiring the sensor electronics. Begin process water flow through the system and adjust the flow rate as necessary.
The chlorine sensor has been polarized and tested prior to shipment but it will require time to re-polarize. After
installation, leave the sensor powered for at least 12 hours in the process before calibration. The system should
be configured for the desired pH compensation (see section 5.6) before calibrating the chlorine measurement.
If the installation uses a dedicated pH sensor for measurement compensation, calibrate the pH sensor (refer to
user guide for the pH sensor for calibration instructions) and install it as required.
The chlorine sensor temperature measurement can be calibrated with a 1-point sample calibration. It is
recommended to calibrate the temperature measurement before calibrating the free chlorine measurement
because the chlorine reading is temperature compensated. Refer to section 5.4 of this manual for the temperature
calibration procedure.
The chlorine measurement is also calibrated with a 1-point sample. Calibration should be done with a measured
free chlorine reading (DPD colorimetric, etc.) that is in the normal measurement range. With this calibration, the
current sensor reading can be set to a known value. Refer to section 5.3 of this manual for the chlorine calibration
procedure.
Note: Be sure the AV38 is properly configured for either fixed or automatic pH compensation. If fixed
compensation is selected, make sure the correct pH value has been entered.
Thermo Scientific AquaSensors
™
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AquaChlor
Free Chlorine Monitor User Guide
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