Checking The Seals - Siemens SITRANS P Operating Instructions Manual

Service and maintenance
11.3 Maintenance and repair work
Improper connection after maintenance
Risk of explosion in areas subject to explosion hazard.
● Connect the device correctly after maintenance.
● Close the device after maintenance work.
Refer to Technical data (Page 199).
Hot surfaces
Risk of burns during maintenance work on parts having surface temperatures exceeding
70 °C (158 °F).
● Take corresponding protective measures, for example by wearing protective gloves.
● After carrying out maintenance, remount touch protection measures.
11.3.1

Checking the seals

Inspect the seals at regular intervals
Note
Incorrect seal changes
Incorrect measured values will be displayed. Changing the seals in a process flange of a
differential pressure measuring cell can alter the lower range value.
● Changing seals in devices with differential pressure measuring cells may only be carried out
by personnel authorized by Siemens.
Note
Using the wrong seals
Using the wrong seals with flush-mounted process connections can cause measuring errors
and/or damage the diaphragm.
● Always use seals which comply with the process connection standards or are
recommended by Siemens.
1. Clean the enclosure and seals.
2. Check the enclosure and the seals for cracks and damage.
3. If necessary, lubricate the seals or replace them.
184
WARNING
CAUTION
SITRANS P320/P420 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E44852162-AC