52
Safety Manual
00809-0200-5100, Rev GB
Proof Test
February 2017
Proof Test
5.1 Check of surface measurement and verification of
the relay function
By combining the two tests Check of Surface Measurement and Verification of the Relay Function
approximately 93% of the DU (dangerous undetected) failures will be detected.
5.1.1 Check of surface measurement
This proof test will detect approximately 69% of the DU (dangerous undetected) failures not
detected by the diagnostics in the Rosemount Tank Gauging Safety System:
Compare the SIL Surface Distance value presented in the Safety Alarm window with a
second reference such as the BPCS level sensor or a manual hand dip (see the
Rosemount 5900S Reference Manual, Document No. 00809-0100-5900, for a description
of how to perform hand dipping)
Verify that the amplitude (SIL Surface Amplitude) is at least 100% greater than the SIL
Amplitude Threshold
With the surface close to the dry-run alarm limit, check that no margin peak is present
anywhere above the surface
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