3
Safety Manual
00809-0400-5100, Rev AB
Safety Instrumented System
November 2019
Safety Instrumented System
1.3 Safety Instrumented System (SIS) certification
The Rosemount Tank Gauging Safety System is designed for applications in high demand
mode operation (demand rate of 1 per week).
The Rosemount Tank Gauging Safety System is certified to:
Low and High Demand of operation
Systematic Capability: SC 3 (SIL 3 capable)
Random Capability for type B device:
- 1 in 1 SIL 2 @ HFT=0
- 2 in 1 SIL 2 @ HFT=0
Note
Refer to the Rosemount 5900/2410 FMEDA report for failure rate data, assessment details,
and assumptions regarding failure rate analysis.
It is important that the Rosemount Tank Gauging Safety System is installed and used in
appropriate applications as described in relevant installation instructions. Otherwise the
required functional safety may not be maintained.
The instruments in a Rosemount Tank Gauging System must be operated within specified
environmental conditions. Operating conditions are available in the Rosemount Tank
Gauging System Data Sheet, Document No. 00813-0100-5100.
If there are any echoes measured by the Rosemount 5900 which cannot be traced back to
the product surface, note if there are any objects such as beams, heating coils etc. in the
tank, that correspond to the found echoes. Appropriate action has to be taken if the
disturbing echoes affect measurement performed, please contact Emerson Process Man-
agement/Rosemount Tank Gauging for advice.
1.3.1 Still-pipe Array Antenna with hinged hatch
The Rosemount 5900 Radar Level Gauge including the SIL alarm output is not safety-rated
during maintenance work. This includes opening of the Rosemount 5900 Still-pipe Array
antenna, hinged hatch version during for example manual gauging (hand-dip) or product
sampling.
During hatch opening, system may go to de-energized state (alarm). If needed, alternative
means should be used to ensure process safety during opening of hatch.
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