Endress+Hauser Proline Promag 300 - Test Sequence C (PTC = 98 %)

Proline Promag 300 HART Proof testing
Endress+Hauser 35
7.1.4 Connecting the test
1. Re-activate the locked SIL mode →  21.
2. Deactivate bypassing of safety function of process control system.
3. Document results of proof test in accordance with the safety management guidelines
applicable to the system.
NOTICE
At least 99 % of dangerous, undetected failures can be detected using the test sequences
described (PTC = 0.99). The influence of systematic errors on the safety function is not
fully covered by the test. Systematic errors can be caused, for example, by medium
properties, operating conditions or buildup.
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If one of the test criteria from the test sequences described above is not fulfilled, the device
may no longer be used as part of a protective system.
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Take measures to reduce systematic errors. For detailed information on the orientation,
medium properties and operating conditions, see the "Operating Instructions" →  10
7.2 Test sequence C (PTC = 98 %)
• Testing with a secondary standard (volume flow)
• Inspection and on-site visual check
Preparation
Byassing of safety function of process control system, to prevent accidental activation of the
safety function.
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Deactivate the locked SIL mode →  28.
7.2.1 Test sequence: Testing with a secondary standard (volume flow)
Testing with a secondary standard (volume flow) Verification of the measured value for liquid
and gaseous volume flow by comparing with a secondary standard.
The measured values (3 to 5 measuring points) are checked with a secondary standard on an
installed device (mobile calibration rig or calibrated reference device) or on a factory
calibration rig following device removal.
The measured values of the secondary standard and the device under test (DUT) are compared
using one of the following methods:
Comparison by reading off the digital measured value
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Compare the digital measured value of the secondary standard against the measured value
display of the DUT at the logic subsystem (process control system or safety-related PLC).
Comparison of the measured value by measuring the current
Requirements for the measuring equipment:
• DC current measuring uncertainty ±0.2 %
• DC current resolution 10 µA
1. Measure the current at the DUT using an external, traceably-calibrated ammeter.