JUMO 14597 safetyM STB/STW Ex - Safety Temperature Limiter and Safety Temperature Monitor Operating Manual - Manual (Page 52)

6 Safety Manual
2013-04-01 46
Table 9:
Safety feature Requirement / comment
SIL
The sensor system is included in the
SIL
evaluation SIL2 SIL3
Operating mode concerning
safety function Operating mode with lower and higher demand rate possible on a customer-specific
basis
Safety-critical inputs Temperature sensor inputs 4 to 20 mA current loop
Safety-relevant inputs Setup and parameterization
Safety-critical output Alarm contact limit value
Subsystem type Type B
Safety architecture (JUMO safetyM
STB/STW Ex logic unit) 1oo2D
Safety architecture (sensor system) SIL2
1oo1 SIL3
1oo2
Hardware fault tolerance (JUMO
safety
M STB/STW Ex logic unit)
HFT=1
Hardware fault tolerance (sensor sys-
tem) SIL2: HFT=0 SIL3: HFT=1
Safe failure fraction SIL2 sensor system HFT=0: 90 % to < 99 % SIL3 sensor system HFT=1:
90 % to < 99 %
CCF Calculation according to DIN EN 61508 Part 7 Appendix D or DIN EN ISO 13849-1
Table F.1 min. 65 %