JUMO 14597 safetyM STB/STW Ex - Safety Temperature Limiter and Safety Temperature Monitor Operating Manual - Manual (Page 64)

6 Safety Manual
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6.14 Other applicable device documentation
For the JUMO safetyM STB/STW Ex the measures, values, and requirements specified in this Operating Manual regarding in-
stallation, electrical connection, function, and startup must be observed.
6.15 Behavior during operation and in the event of a fault
Behavior during operation and the event of a fault is described in the Operating Manual.
A functional test must be performed after startup, repairs on the safety system, or a change in safety-related parameters.
If an error is detected during a functional test, measures must be taken to once again ensure the functional capability of the
safety system. This can be done by replacing the logic unit, for example.
Appropriate documentation of tests that are performed is recommended.
6.16 Regular tests
No test is required for SIL2 and SIL3 certified systems since the proof check equals the lifetime.
Each is ten years.
6.16.1 Recommended tests for temperature probes
To ensure safe and reliable operation of the temperature probe, the following service and maintenance work must be per-
formed:
The following tests are recommended at certain intervals:
- Every 12 months, the leakage resistance of the measuring circuit must be measured against the protection fitting (for ther-
mocouples: only for the insulated measuring circuit; in the case of multiple measuring circuits, the insulation test must also
be performed between the individual measuring circuits). The minimal leakage resistance at room temperature should be
100 M
Ω
at 100 V.
H
After the lifetime expires, the systems no longer meet the requirements according to their SIL certification.