Operation; Proof Test - Pepperl+Fuchs KFD2-SCD2-Ex LK Series Manual

Functional Safety KFD2-SCD2-Ex*.LK, HiD2038

Operation

5 Operation
Danger!
Danger to life from missing safety function
If the safety loop is put out of service, the safety function is no longer guaranteed.
• Do not deactivate the device.
• Do not bypass the safety function.
• Do not repair, modify, or manipulate the device.
Operating the device
1.
Observe the safety instruction in the instruction manual.
2.
Observe the information in the manual.
3.
Use the device only with devices that are suitable for this safety application.
4.
Correct any occurring safe failures within 24 hours. Take measures to maintain
the safety function while the device is being repaired.
5.1

Proof Test

This section describes a possible proof test procedure. The user is not obliged to use
this proposal. The user may consider different concepts with an individual determination
of the respective effectiveness, e. g. concepts according to NA106:2018.
According to IEC/EN 61508-2 a recurring proof test shall be undertaken to reveal potential
dangerous failures that are not detected otherwise.
Check the function of the subsystem at periodic intervals depending on the applied
PFD in accordance with the characteristic safety values. See chapter 3.4.
avg
It is under the responsibility of the plant operator to define the type of proof test and the interval
time period.
Conditions
• Digital multimeter with an accuracy better than 0.1 %
Use for the proof test of the intrinsic safety side of the device a special digital multimeter
for intrinsically safe circuits.
If intrinsically safe circuits are operated with non-intrinsically safe circuits, they must
no longer be used as intrinsically safe circuits.
• Power supply set to nominal voltage of 24 V DC
• Process calibrator with current source function with an accuracy better than 20 µA
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