Emerson Rosemount 5408 Reference Manual page 150

Safety Instrumented Systems (SIS) requirements
February 2020
measured value goes beyond the measurement range, the transmitter enters saturation
mode.
The measurement signal used by the logic solver must be the analog 4-20 mA signal
proportional to the level or distance (ullage) generated. The HART
used for setup, calibration, and diagnostic purposes, not for safety critical operation.
The Rosemount
• Low and high demand: Type B element
• SIL 2 for random integrity @ HFT=0
• SIL 3 for random integrity @ HFT=1
• SIL 3 for systematic capability
Figure 8-1: SIF Configuration Examples
A. Rosemount 5408:SIS Level Transmitter (sensor)
B. Logic-solver
C. Actuator
D. Single use 1oo1 (1-out-of-1) for SIL2 (SIL 2@ HFT=0)
E. Redundant use 1oo2 for SIL3 (SIL3@ HFT=1)
F. Redundant use 2oo3 for SIL3 (SIL3@ HFT=1)
150
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5408:SIS Level Transmitter is IEC 61508 certified accordingly:
Reference Manual
00809-0100-4408
®
protocol can only be
Reference Manual