Functional Safety KCD2-UT2-(Ex)1, HiC2081
Operation
201
8-02
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5
Operation
Operating the device
1. Observe the safety instructions 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 8 hours. Take measures to maintain the safety
function while the device is being repaired.
5.1
Proof Test
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
avg
in
accordance with the characteristic safety values. See chapter 3.4.
It is under the responsibility of the plant operator to define the type of proof test and the interval
time period.
The following sections describe the steps of the proof test. The proof test reveals almost all
possible dangerous faults (diagnostic coverage > 90 %).
Check the settings after the configuration by suitable tests.
5.2
Proof Test Procedure for KCD2-UT2-(Ex)1
Perform the proof test with the same configuration that you use in the application. Substitute
the sensor with a sensor simulator or a calibrator.
Check the safety function at the input, which must be configured to set the output values to
4 mA, 12 mA, 20 mA.
Equipment required:
•
Digital multimeter with an accuracy of 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.
•
TC simulator, RTD simulator, voltage source or resistor
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.
