Endress+Hauser CCS50D, Operating Instructions Manual

Page: 33 / 52

CCS50D Maintenance
Hauser 33
Cleaning sensor membrane
L
CAUTION
Diluted hydrochloric acid
Hydrochloric acid causes irritation if it comes into contact with the skin or eyes.
‣
When using diluted hydrochloric acid, wear protective clothing such as gloves and goggles.
‣
Avoid splashes.
NOTICE
Chemicals that reduce surface tension (e.g. surfactants in cleaning agents or organic
solvents such as alcohol that can be mixed with water)
Due to chemicals that reduce surface tension, the sensor membrane loses its water-repellent
characteristics and becomes permeable to water. The sensor membrane loses its protective
effect, resulting in measured errors.
‣
Do not use any chemicals that reduce surface tension.
If the membrane is visibly dirty, e.g. biofilm, proceed as follows:
1. Remove sensor from flow assembly →  32.
2. Remove membrane cap →  34.
3. Clean the membrane cap mechanically only using a gentle water jet. Alternatively, clean
for several minutes in diluted acids or in specified cleaning agents without any further
chemical additives.
4. Then rinse thoroughly with water.
5. Screw membrane cap back onto sensor →  34.
Cleaning electrode body
L
CAUTION
Diluted hydrochloric acid
Hydrochloric acid causes irritation if it comes into contact with the skin or eyes.
‣
When using diluted hydrochloric acid, wear protective clothing such as gloves and goggles.
‣
Avoid splashes.
NOTICE
Chemicals that reduce surface tension (e.g. surfactants in cleaning agents or organic
solvents such as alcohol that can be mixed with water)
Due to chemicals that reduce surface tension, the sensor membrane loses its water-repellent
characteristics and becomes permeable to water. The sensor membrane loses its protective
effect, resulting in measured errors.
‣
Do not use any chemicals that reduce surface tension.
1. Remove sensor from flow assembly →  32.
2. Remove membrane cap →  34.
3. Wipe gold electrode carefully using a soft sponge.
4. Rinse electrode body with demineralized water, alcohol or acid.