Endress+Hauser Oxymax COS61D, Руководство по эксплуатации

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Oxymax COS61D Calibration and adjustment
Hauser 21
7 Calibration and adjustment
7.1 Types of calibration
The following types of calibration are possible:
• Zero point
• Single-point calibration in nitrogen or COY8 zero-point gel
• Numeric input
• Slope
• Air 100% rh (air, water vapor-saturated)
• H2O air-saturated (air-saturated water)
• Air, variable
• Numeric input
• Sample calibration
• Temperature adjustment
7.2 Calibration intervals
Specifying the intervals
If you want to calibrate the sensor intermittently for a special application and/or on
account of a special type of installation, you can calculate the intervals using the following
method:
1. Remove the sensor from the medium.
2. Clean the outside of the sensor with a damp cloth.
3. Then dry the sensor diaphragm carefully with a soft paper towel for example.
4.
NOTICE
Incorrect measurements caused by atmospheric influences!
‣
Protect the sensor against external influences such as sunlight and wind.
After 10 minutes, measure the oxygen saturation index in air.
5. Decide using the results:
a) Measured value is not 100 ± 2 %SAT → Calibrate sensor.
b) If the values are within the interval specified, you do not need to calibrate the sensor.
Extend the period until the next inspection.
6. Repeat the steps specified after two, four or eight months to determine the optimum
calibration interval for your sensor.
‣
In any case, calibrate the sensor at least once a year.
7.3 Calibration in air with 100% rH
1. Activate the hold status at the transmitter.
2. Remove the sensor from the medium.
3. Clean the outside of the sensor carefully with a damp cloth.
4. Suspend the sensor just above the surface of the water.
Do not immerse the sensor.
5. Allow a temperature compensation time of approx. 20 minutes for the sensor in the
ambient air. Make sure that the sensor is not exposed to any direct ambient effects
(direct sunlight, drafts) during this time.