Cleanfit CPA871 Maintenance
Endress+Hauser 53
8.2.4 Replacing seals
To replace the seals in the assembly, you must interrupt the process and remove the assembly
completely.
L
CAUTION
Risk of injury due to residual medium and elevated temperatures
‣
When handling parts that are in contact with the medium, protect against residual
medium and elevated temperatures. Wear protective goggles and safety gloves.
L
CAUTION
Increased wear on seals subject to dynamic load
‣
Lubricate seals sufficiently, e.g. with Paraliq GTE 703.
‣
Reduce maintenance cycles.
‣
Clean the assembly prior to replacing seals. (→ 51)
Preparation:
1. Interrupt the process. Pay attention to residual medium, residual pressure as well as
elevated temperatures.
2. Move the assembly to service position.
3. Completely detach the assembly from the process connection.
4. Clean the assembly. (→ 51)
Checking that the sealing system is intact
Check the seals after mounting or removing the sensor and when maintenance work is
performed. At regular intervals.
1. Move the assembly to the service position
2. If provided, open the ball valve of the service chamber outlet
It is normal for a slight amount of medium to escape (connection between the
service chamber and process during insertion/retraction).
3. If provided, rinse the service chamber/sensor.
4. Observe the outlet. No more medium should escape after a short period of time.
5. If medium continues to escape, the sealing system is damaged; take the measuring point
out of service and perform maintenance on the assembly.
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