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Affecting factors are:
- storage / operating temperature
- dirt particles from the measured water
- mechanical stress on sensor membrane
- storage of filled sensor in dry air
- continuous use in sensors with carbon dioxide concentrations
Operating position:
The correct operating position is with the sensor opening facing downwards.
Measurement accuracy:
The measurement accuracy can be affected by:
- insufficient flow
- water and sensor temperature must be in balance. Most accurate measurement if
calibration is done at measurement temperature.
7.2 Sensor set-up
The sensor is delivered filled with electrolyte which means it is immediately ready to use.
If the sensor is replaced with a new one, it must be calibrated prior to its first use (see Chapter 9).
7.3 Sensor maintenance
If it is not possible to calibrate the sensor or it only produces instable measurement values, it
has to be serviced or the membrane cap must be replaced.
First unscrew the membrane cap and remove the old electrolyte.
Unscrew the membrane head and wipe off the electrolyte solution carefully using a paper towel.
Attention: Old electrolyte will leak out!
If the membrane is undamaged, the membrane head can be re-used. Otherwise the membrane
head must be replaced.
After filling, the sensor must be left for 2 hours until the sensor has re-stabilized.
Wear suitable gloves*) when filling the sensor! Do not allow the electrolyte to come into
contact with your hands. If it does come into contact with your skin, rinse the affected area
thoroughly in water.
Material:
• Sensor
• Spare membrane cap if necessary
• Filling pipette
• KOH electrolyte
• Flat screwdriver
• Paper towel
• Suitable gloves*)
• Wash basin
Figure: Filling with pipette
*) suitable gloves: According to DIN EN 420, made from natural latex, natural rubber, butyl rubber,
nitrile rubber, chloroprene rubber, fluorinated rubber.
43
SD 310_1 10/2015
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