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May 2019
4
Calibrate
4.1
Zero point calibration
Even in the absence of ozone, the Rosemount 499AOZ sensor generates a
small signal called the zero current. Failing to correct for the zero current can
introduce a bias, particularly if the ozone concentration is small (<0.4 ppm).
Zero the sensor when it is first placed in service and every time the fill
solution is changed.
To zero the sensor:
Procedure
1. Pour a cup of deionized or bottled water.
2. Place the sensor in the water.
3. Wait until the sensor current has reached a stable low value (at least
two hours).
4. Follow the transmitter prompts for zeroing the sensor.
Note
Refer to the manual for the transmitter you are using (Rosemount
56, 1056, 5081, or 1066).
The zero current should be between -10 and +10 nA.
4.2
Full scale calibration
Because stable dilute ozone standards are not available, the sensor must be
calibrated against the results of a laboratory test run on a grab sample of the
process liquid.
Procedure
1. Place the sensor in the flow cell.
2. Start the sample and reagent flow.
3. Adjust the sample flow to the correct range.
4. Adjust the concentration so that it is near the upper end of the
operating range.
5. Wait for the readings to stabilize.
6. Follow the transmitter prompts to complete the calibration.
Note
Refer to the manual for the transmitter you are using (Rosemount
56, 1056, 5081, or 1066).
Quick Start Guide
Quick Start Guide
17
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