6 safety manual – JUMO 14597 safetyM STB/STW Ex - Safety Temperature Limiter and Safety Temperature Monitor Operating Manual User Manual
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6 Safety Manual
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6.8
Safety-related parameters related to the temperature monitoring unit
The following parameters were calculated by means of an FMEDA component under the following conditions:
-
Error models corresponding to requirements of DIN EN 61508 for conformity with SIL2 or SIL3
-
Failure rate of components according to the RDF 2000 UTE C 80-810 standard and SN 29500
-
Sensors were combined as a subsystem in the following 6 variants:
6.8.1
Failure rates and SSF for type 701155/X-XX-025X-XXXX-23... (AC 230 V)
Important information:
Variants 1 to 4 were evaluated with JUMO probes according to data sheets 901006 and 902006.
For variant 5 no sensor system was included (only the JUMO safety
M STB/STW Ex).
In this case, the plant operator selects the sensor system.
Table 4:
Variant
λ
s
[Fit]
λ
dd
[Fit]
λ
du
[Fit]
SFF
PFH (1/h)
PFD
avg
1
985.14
306.75
32.93
96 %
5.18 e
-9
2.29 e
-4
1a
985.14
306.75
32.93
96 %
1.66 e
-9
7.29 e
-5
2
988.1
303.79
32.93
96 %
1.66 e
-9
7.29 e
-5
3
1001.55
324.85
36.68
96 %
1.71 e
-9
7.46 e
-5
4
1007.61
341.89
38.58
96 %
1.73 e
-9
7.55 e
-5
5
1000.95
318.38
31.75
96 %
1.54 e
-9
6.74 e
-5