Nivotester FTL325P Proof testing
Endress+Hauser 23
5.3 Device behavior in the event of an alarm
The behavior of the device in the event of an alarm is described in the relevant Operating
Instructions.
6 Proof testing
The functional integrity of the device in the SIL mode must be verified during
commissioning, when changes are made to safety-related parameters, as well as at
appropriate time intervals. The operator must determine the time intervals.
L
CAUTION
The safety function is not guaranteed during a proof test.
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Suitable measures must be taken to guarantee process safety during the test.
When using the proof-test wizard in the SmartBlue app, the correct version must be
selected.
The proof tests for version II to version VI are described below.
Proof testing of the device can be performed as follows:
• Test sequence A:
Approach the level, or remove and immerse in a medium of similar density and viscosity
• Test sequence A, MIN detection
• Test sequence A, MAX detection
• Test sequence B:
Simulation using test button
• Test sequence B, simulation using test button on Liquiphant
• Test sequence B, simulation using test button on Nivotester
Note the following for the test sequences:
• A demand mode or a fault takes absolute precedence over the proof test and in the
measuring system safety path. For this reason, the demand mode must first be ended
or the fault rectified before the proof test can commence.
• The proof test can and may only be performed if the device status is OK.
• The status of the individual output signal is indicated by a measuring device or a
downstream component of the safety path (e.g., PLC, actuator).
• The individual proof test coverages (PTC) that can be used for calculation are specified
in the Declaration of Conformity.
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