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Safety Manual
00809-0200-5100, Rev GB
Installation and Configuration
February 2017
Installation and Configuration
4.2 Safety alarm setup
The Safety Alarm Setup procedure is used to set up the SIL Alarm Limits, the tank geometry, and
to adjust the Rosemount 5900 Level Gauge for optimum measurement performance in the
tank.
Prior to starting the Safety Alarm Setup, ensure that the actual distance to the product surface is
known. This information is usually retrieved from the BPCS level sensor, or alternatively hand
dipping can be performed.
Ensure that the product surface is calm and that the tank is not being emptied or filled during
the safety alarm setup procedure.
4.2.1 Safety measurement performance
The Rosemount Tank Gauging Safety System has a safety accuracy better than ±0.5% of the
measuring distance, or ±50 mm whichever is greater.
For Liquid Gas applications, the safety accuracy is reduced to about 4% of the measuring range.
For Liquid Gas mixtures such as n-butane and propane, the safety accuracy is typically reduced
to about 2% at the most. For estimation of the potential effect of other product mixtures, please
contact your Emerson Process Management/Rosemount Tank Gauging representative.
Measuring range is from 1.2 m to 30 m (3.9 ft to 100 ft) below flange. For longer measuring
range, please contact your Emerson Process Management/Rosemount Tank Gauging represen-
tative.
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