Emerson Rosemount 8800D Series - Page 23

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