Endress+Hauser Oxymax W COS61, Руководство по эксплуатации

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Oxymax W COS61 Maintenance
Hauser 21
7 Maintenance
Maintenance work must be carried out at regular intervals. To ensure that it is carried out, we
recommend you enter the maintenance dates into an operations logbook or in an operations
calendar in advance.
The maintenance cycle primarily depends on the system, the installation conditions and the
medium in which measurement is taking place.
The following activities must be carried out:
• Cleaning the sensor
• 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 at 100 ± 4 % SAT
(Display O
2
saturation with COM 2x3: press plus key four times).
• If necessary, replace a defective membrane or one which cannot be cleaned any more.
• Recalibration
(if desired or required)
!
Note!
For regular automatic sensor cleaning, we recommend equipping the measuring point with a
fully-automatic cleaning system, e.g. Chemoclean (see "Accessories").
7.1 Cleaning the sensor
The measurement can be corrupted by sensor fouling or malfunction, e.g.:
• Buildup on the fluorescence cap
➠
causes longer response times and a reduced slope under certain circumstances.
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.
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 fluorescence cap Clean the membrane with water and a soft sponge.