Emerson Rosemount 8800D Series Safety Manual page 23

Figure 3-1:
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Figure 3-2:
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Safety Manual
Single use 1oo1 (1 out of 1) for SIL 2 low demand (SIL 2@HFT=0)
Sensor (Rosemount 8800D)
Logic solver
Actuator
PFD and PFD average of system when no proof testing applied
2 4 6
PFD (Probability of failure on demand)
Mission time (years)
PFD (average probability of failure on demand)
AVG
Predicted PFD
8 10
Proof tests
19