JUMO 701150 14597 safetyM STB/STW - Safety Temperature Limiter and Safety Temperature Monitor Operating Manual - Manual (Page 59)

6 Safety Manual 59 2014-05-01
6.13 Other applicable device documentation
For temperature monitoring unit 701150 the measures, values, and requirements specified in this Operating Manual regarding
installation, electrical connection, function, and startup must be observed.
6.14 Behavior during operation and in case of malfunction
Behavior during operation and in case of a malfunction is described in the Operating Manual.
A functional test must be performed after startup, repair in 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, for example, can be done by replacing the logic unit.
Appropriate documentation of tests that are performed is recommended.
6.15 Regular tests
No test is required for SIL2 and SIL3 certified systems since the proof check equals the lifetime. Each is ten years.
6.15.1 Recommended tests for temperature probes
To ensure safe and reliable operation of the thermometer, the following service and maintenance work must be performed:
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 thermo-
couples: only for the insulated measuring circuit; in the case of multiple measuring circuits, the insulation test must also be per-
formed between the individual measuring circuits). The minimal leakage resistance at room temperature should be 100 M Ω at
100 V.
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Damage and corrosion of thermometers – protection tubes
- Corrosion and correct positioning of the contacts and terminals of cable connections
H
After the lifetime expires, the systems no longer meet the requirements according to their SIL certification.