Functional Safety KFD2-UT2-(Ex)*(-1)
Operation
2019-10
17
5.2.1 Thermocouple Input (TC)
Figure 5.1 Proof test set-up for KFD2-UT2-(Ex)*(-1) with thermocouple input (TC)
Usage in Zone 0, 1, 2/Div. 1, 2 only for KFD2-UT2-Ex1(-1) and KFD2-UT2-Ex2(-1)
1-channel versions KFD2-UT2-1(-1) and KFD2-UT2-Ex1(-1) have only one channel.
Proof Test Procedure
Additional equipment: 110 fixed resistor (accuracy of 0.1 %)
1. Connect the TC simulator to the terminals 1+ and 2- (channel I) and 4+ and 5- (channel II).
2. Connect the digital multimeter to the terminals 7 and 8 (channel I)
and 10 and 11 (channel II).
3. Set the compensation/reference temperature on the TC simulator to 26 °C.
4. Connect the fixed resistor to terminals 2 and 3 (channel I) and 5 and 6 (channel II).
5. Set the TC simulator sequentially to the temperature values
representing 4 mA, 12 mA, 20 mA at the output.
6. Measure the output current.
The proof test is passed if the output values are within 2 % of the output span.
1
This means:
– for the 4 mA application: 3.7 mA to 4.3 mA
– for the 12 mA application: 11.7 mA to 12.3 mA
– for the 20 mA application: 19.7 mA to 20.3 mA
7. Remove the TC simulator. Check if a lead breakage is detected.
The red LED is flashing. The output behavior in the event of a fault depends
on the device configuration.
KFD2-UT2-Ex2
Zone 0, 1, 2
Div. 1, 2
2
3
1
5
6
4
7
9-
8+
10
12-
11+
110Ω
TC
Sim.
110Ω
TC
Sim.
Fault
I supply
Zone 2
Div. 2
Multimeter
(mA)
Multimeter
(mA)
I
II
Supply +
Supply -
24 V DC
Power
supply
Supply
Bus
1
Additionally the loop diagnosis shall be tested to prove that the fault signaling via the current output is working
correctly. The output current in the event of a failure depends on the device configuration. Please record
this configuration and the resulting expected fault signaling current in the test report. Example: if downscale
is configured, 2.0 mA ±1 % must be measured in the event of a failure. The red LED must be flashing.
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