Maintenance And Repair Work; Defining The Maintenance Interval; Checking The Gaskets - Siemens 7MF8.23 Series Compact Operating Instructions

Maintenance and repair work

Defining the maintenance interval

WARNING
No maintenance interval has been defined
Device failure, device damage, and risk of injury.
● Define a maintenance interval for regular tests in line with device use and empirical values.
● The maintenance interval will vary from site to site depending on corrosion resistance.

Checking the gaskets

Inspect the seals at regular intervals
NOTICE
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.
NOTICE
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.
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.
SITRANS P300 (7MF8.23.. 7MF8.24.. 7MF8.25..)
A5E03434761-01, 08/2011
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