Proof Test; Proof Test Procedure - Pepperl+Fuchs SIL KFD0-SD2-*. Series Safety Manual

SAFETY MANUAL SIL K*D0-SD*-(EX)*.****(.SP), HIC2871

Proof Test

4 Proof Test
4.1

Proof Test Procedure

According to IEC 61508-2 a recurring proof test shall be undertaken to reveal
potential dangerous failures that are otherwise not detected by diagnostic test.
The functionality of the subsystem must be verified at periodic intervals
depending on the applied PFD
manual. See chapter 2.4.
It is under the responsibility of the operator to define the type of proof test and the
interval time period.
As for these loop powered modules no dangerous failures can occur there is no
recurring proof test necessary.
Nevertheless we recommend to perform a regular functional test (e. g. in
combination with the proof test of the final element).
With the following instructions the correct working of the basic functionality can be
tested.
The ancillary equipment required:

The settings have to be verified after the configuration by means of suitable tests.
Procedure:
The entire measuring loop must be put out of service and the process held in

safe condition by means of other measures.
Prepare a test set-up for testing the device and perform the tests in

accordance to the respective chapter.
Restore the safety loop. Any by-pass of the safety function must be removed.

12
• Digital multimeter with an accuracy better than 0.1 %
For the proof test of the intrinsic safety side of the devices, a special
digital multimeter for intrinsic safety circuits must be used. Intrinsic safety
circuits that were operated with circuits of other types of protection may
not be used as intrinsically safe circuits afterwards.
• Power supply set at nominal voltage of 24 V DC
in accordance with the data provided in this
avg