Emerson Rosemount 2410 - Functional Specification of the Safety Function; Safety Architecture

5
Safety Manual
00809-0400-5100, Rev AB
Safety Instrumented System
November 2019
Safety Instrumented System
1.5 Functional specification of the safety function
The safety function is based on the analog output 4-20 mA or K1/K2 relay outputs.
If a measured value goes beyond the measurement range, the transmitter enters saturation
mode (limit alarm is disabled) or alarm mode, depending on the current configuration.
The Rosemount Tank Gauging Safety System provides either:
 one or two relay outputs, and/or
 one 4-20 mA output
and measures the distance from the Gauge reference point to the surface of a liquid in a
tank.
The Rosemount Tank Gauging Safety System contains advanced self-diagnostics; internal
monitoring features, and is programmed to go to de-energized state (alarm) upon
detection of an internal failure.
1.5.1 Safety architecture
The Rosemount Tank Gauging Safety System offers various models in order to support
different system configurations.
SIL 2 1-in-1 (1oo1D)
 Single channel architecture (1oo1D) complying with SIL 2. This version includes
one Rosemount 5900 Radar Level Gauge, one antenna, and one
Rosemount 2410 Tank Hub.
SIL 2 2-in-1 (1oo1D)
 Single channel architecture (1oo1D) complying with SIL 2. This version includes
one “2-in-1” Rosemount 5900 Radar Level Gauge, one antenna, and one
Rosemount 2410 Tank Hub.