JUMO 14597 safetyM STB/STW Ex - Safety Temperature Limiter and Safety Temperature Monitor Operating Manual - Manual (Page 57)

6 Safety Manual
51 2013-04-01
Important information:
Variants 1 to 4 were evaluated with JUMO probes according to data sheets 901006 and 902006. For variant 5 no sensor sys-
tem was included (only the JUMO safety
M STB/STW Ex). In this case, the plant operator selects the sensor system. For this
reason, the plant operator is responsible for evaluating the achievable PL.
Table 11: Achievable PL
Variant Connected sensors Sensor sys-
tem architec-
ture Logic ar-
chitecture
Achievable PL
1 1x Pt100 2-wire circuit 1oo1 1oo2D PLd
1a 2x Pt100/1000 2-wire circuit 1oo2 1oo2D PLe
2 2x Pt100/1000 3-wire circuit 1oo2 1oo2D PLe
3 2x thermocouple 1oo2 1oo2D PLe
4 1x Pt100/1000 2-wire and 3-
wire circuit
1x thermocouple 1oo2 1oo2D PLe
5 STB/STW 701155 without
sensor system 1oo2D archi-
tecture
No probe or use of 4 to 20 mA
This means the sensor is not
taken into account in the cal-
culation. Sensors con-
nected by the
plant operator
Architecture
acc. to con-
nection 1oo1
or 1oo2 1oo2D PL of the used sen-
sor
MTFF
d
= 100 years
Max. achievable PL of
the system with 1oo1
sensor system architec-
ture
DC
701155
≥
90 %
Max. achievable PL of
the system with 1oo2
sensor system architec-
ture
DC
701155
≥
90 %
PLb PLd PLe
PLc PLd PLe
PLd PLd PLe
PLe PLe PLe