Endress+Hauser CCS240, Operating Instructions Manual

Page: 25 / 40

CCS240/241 Maintenance
Hauser 25
9.2.3 Refilling the electrolyte
NOTICE
Damage to membrane and electrodes, air bubbles
Possibility of measured errors to complete failure of the measuring point
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Do not touch the membrane or electrodes. Avoid damaging them.
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The electrolyte is chemically neutral and is not hazardous to health. Nonetheless, do not
swallow it and avoid contact with eyes.
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Keep the electrolyte bottle closed after use. Do not transfer electrolyte to other vessels.
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Do not store electrolyte for longer than 2 years. The electrolyte must not be yellow in color.
Observe the use-by date on the label.
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Avoid air bubbles when pouring electrolyte into the membrane cap.
1. Unscrew the measuring chamber from the shaft.
2. Hold the measuring chamber at an angle and pour in approx.
7 to 8 ml (0.24 to 0.27 fl.oz) of electrolyte, up to the internal thread.
3. Tap the filled chamber several times against a flat surface so that adherent air bubbles
on the inside can detach and rise.
4. Insert the sensor shaft vertically into the measuring chamber.
5. Slowly tighten the measuring chamber to the stop. While tightening, excess electrolyte
is forced out at the bottom of the sensor.
6. If necessary, use a cloth to wipe the measuring chamber and screw cap dry.
9.2.4 Storing the sensor
If measurement is suspended for a short period of time and it can be guaranteed that the
sensor will be kept moist while in storage:
1. If the assembly is guaranteed not to empty out,
you may leave the sensor in the flow assembly.
2. If there is a possibility that the assembly may empty out,
Remove sensor from assembly .
3. To keep the membrane moist after the sensor has been removed, refill the protection
cap with electrolyte or clean water.
4. Fit protection cap on sensor →  26.
During longterm interruptions to measurement, particularly if dehydration is possible:
1. Remove sensor from assembly.
2. Clean sensor shaft and membrane cap with cold water and leave to dry.
3. Loosely screw on membrane cap up to the stop. This ensures that the membrane
remains slack.
4. Pour electrolyte or clean water into protection cap and attach →  25.