Endress+Hauser Memosens COS81D, Operating Instructions Manual

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Memosens COS81D Maintenance
Hauser 29
For reliable measurement, the sensor must be cleaned at regular intervals. The frequency
and intensity of the cleaning operation depend on the medium.
Clean the sensor:
• Before every calibration
• Before returning it for repairs
Type of contamination Cleaning
Salt deposits 1. Immerse the sensor in drinking water.
2. Then rinse it with copious amounts of water.
Dirt particles on the sensor shaft and shaft
sleeve (
not spot cap! )
‣
Clean sensor shaft and sleeve with water and a suitable
sponge.
Dirt particles on spot cap
‣
Clean the spot cap with water. No mechanical cleaning.
‣
After cleaning:
Rinse with copious amounts of clean water.
10.4 Cleaning sensor optics
The optics need to be cleaned only if there is visible buildup on the optical waveguide or
boundary area.
A0043084
A0043085
A0043086
1. Unscrew the spot cap from the sensor head.
2. Carefully clean the optical surface (→  1,  9, item 8) with a soft cloth (preferably
the cleaning cloth supplied with the COV81 maintenance kit) until the buildup is fully
removed.
3. Wipe the optical surface with a soft cloth that is wetted with drinking water or
distilled water.
4. Dry the optical surface and screw on a functional spot cap.
5. At the transmitter, execute the
Sensor cap change command and then perform the
necessary calibrations.
NOTICE
Damage, scratches on optical surface
Distorted measured values
‣
Make sure that the optical surface is not scratched or damaged in any other way.