Siemens SITRANS P DS III Serie Notice De Service page 36

6.2.2 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.
6.2.3 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
In case of defect, you can replace the electronic unit by following the warning notes and the provided instruction manual.
6.3 Cleaning
WARNING
Dust layers above 5 mm
Danger of explosion in hazardous areas. Device may overheat du to dust build up.
● Remove any dust layers in excess of 5 mm.
NOTICE
Penetration of moisture into the device
Device damage.
● Make sure when carrying out cleaning and maintenance work that no moisture penetrates the inside of the device.
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SITRANS P, DS III series (7MF4.33.. 7MF4.34.. 7MF4.35..)
A5E03434626-02, 12/2012