Maintenance
Oxymax H COS21D
24
Hauser
(In particular when the membrane is soiled)
• If necessary, replacing wear and tear materials:
– sealing ring
– electrolyte
– membrane cap
• Check the measuring function:
1. Remove the sensor from the medium.
2. Clean and dry the membrane.
3. After about 10 minutes, measure the oxygen saturation index in air (without
recalibration).
4. The measured value should be near to 100 ± 2 % SAT.
• Recalibration.
(if desired or required)
7.1
Cleaning
The measurement can be corrupted by sensor fouling or malfunction, e.g.:
• Coatings on the sensor membrane
--> cause longer response times and a reduced slope under certain circumstances.
• Soiling or poisoning of the electrolyte
--> causes longer response times and false measurement.
To ensure reliable measurement, the sensor must be cleaned at regular intervals. The frequency
and intensity of the cleaning operation depend on the measuring medium.
7.1.1
Cleaning the sensor surface
Clean the sensor:
• before every calibration
• at regular intervals during operation as necessary
• before returning it for repairs.
Depending on the type of soiling, proceed as follows:
"
Caution!
After cleaning, rinse the sensor with copious amounts of clean water.
Type of soiling
Cleaning
Salt deposits
Immerse the sensor in drinking water or in 1-5% hydrochloric acid
for a few minutes. Afterwards, rinse it with copious amounts of water.
Dirt particles on the sensor body
(not cap!)
Clean the sensor body mechanically with water and a suitable brush.
Dirt particles on the membrane cap or the
membrane
Clean with water and a soft sponge.
