2011-09
14
SAFETY MANUAL SIL KFD2-UT2-(EX)*, HID2082
Proof Test
4 Proof Test
4.1 General
According to IEC 61508-2 a recurring proof test shall be undertaken to reveal
potentially dangerous failures that are otherwise not detected by diagnostic tests.
The functionality of the subsystem must be verified at periodic intervals
depending on the applied PFD
avg
in accordance with the data stated in the
"Characteristic Safety Values" chapter (see chapter 2.4).
The functionality of the subsystem must be verified at periodic intervals
depending on the applied PFD
avg
in accordance with the data provided in the
safety certificate available on our webpage www.pepperl-fuchs.com.
It is under the responsibility of the operator to define the type of proof test and the
interval time period.
With the following instructions a proof test can be performed which will reveal
almost all of the possible dangerous faults (diagnostic coverage > 90 %).
4.2 Proof Test Procedure for KFD2-UT2-(Ex)*
Ge n e r a l
The proof test shall be performed with the same configuration which is used in the
application. The sensors shall be substituted by sensor simulator/calibrators.
Prove the safety function at input values which are configured to set the output to
4 mA, 12 mA, 20 mA.
Measurement set up:
■ Sensor simulation/voltage source/resistor
■ Current meter/digital multimeter (DMM)
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