JUMO 701150 14597 safetyM STB/STW - Safety Temperature Limiter and Safety Temperature Monitor Operating Manual - Manual (Page 47)

6 Safety Manual 47 2014-05-01
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 (logic unit JUMO
STB/STW 701150)
1oo2D
Safety architecture (sensor system) SIL2
1oo1
SIL3
1oo2
Hardware error tolerance (logic unit
JUMO STB/STW 70.1150)
HFT=1
Hardware error tolerance (sensor sys-
tem)
SIL2: HFT=0 SIL3: HFT=1
Proportion of safe errors 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 and/or DIN EN ISO 13849-
1 Table F.1 min. 65 %
Average failure probability of a safety
function on demand (overall system)
SIL2:
Low demand: PFD avg < 10 -2
High demand: PFH < 10 -6
SIL3:
Low demand: PFD avg < 10 -3
High demand: PFH < 10 -7
Interval for repeat test No repeat test