8
Safety Manual
00809-0200-5100, Rev GB
Scope of the Product
February 2017
Scope of the Product
3.2.2 Functional specification of the safety function
The Rosemount Tank Gauging Safety System provides a SIL Alarm Relay output to indicate
overfill or dry-run risk. No other output is related to the safety function.
The Rosemount Tank Gauging Safety System provides the following safety functions:
Measures the distance from the SIL Reference Point to the surface of a liquid in a tank
De-energizes (alarm) a safety critical output signal upon passing the configured SIL
High or Low Alarm Limits, where these limits are defined as distances from the SIL
Reference Point
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.
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
5900 Radar Level Gauge, one antenna, and one 2410 Tank Hub.
SIL 2 2-in-1 (1oo1D)
Single channel architecture (1oo1D) complying with SIL 2. This version includes one
“2-in-1” 5900 Radar Level Gauge, one antenna, and one 2410 Tank Hub.
SIL 3 2-in-1 (1oo2D)
Dual channel architecture (internal 1oo2D) complying with SIL 3 - high reliability
version. Voting is performed in terminal block of 5900 Radar level gauge. This version
includes one “2-in-1” 5900 Radar Level Gauge, one antenna, and one 2410 Tank Hub.
In addition to the options described above, the customer can implement a system that
complies with SIL 3 by having voting (1oo2D) performed in a safety logic solver. This
version includes two Rosemount Tank Gauging Safety Systems with single channel
architecture complying with SIL 2 (two 5900 Radar Level Gauges, two antennas, and
two 2410 Tank Hubs).
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