JUMO 14597 safetyM STB/STW Ex - Safety Temperature Limiter and Safety Temperature Monitor Operating Manual - Manual (Page 46)

6 Safety Manual
2013-04-01 40
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