
10.2.2 Checking the gaskets
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 start-of-scale 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 seals for cracks and damage.
3. Grease the seals if necessary.
- or -
4. Replace the seals.
10.2.3 Display in case of a fault
Check the start of scale value of the device from time to time.
Differentiate between the following in case of a fault:
● The internal self test has detected a fault, e.g. sensor break, hardware fault/Firmware fault.
Displays:
– Display: "ERROR" display and ticker with an error text
– Analog output: Factory setting: Failure current 3.6 or 22.8 mA
Or depending on the parameterization
– HART: detailed error breakdown for display in the HART communicator or SIMATIC
PDM
● Grave hardware faults, the processor is not functioning.
Displays:
– Display: no defined display
– Analog output: failure current < 3.6 mA
Service and maintenance
10.2 Maintenance and repair work
SITRANS P, DS III series with HART
Operating Instructions, 09/2012, A5E00047092-08 163
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