Endress+Hauser iTEMP TMT142B - Page 19

iTEMP TMT142B Electrical connection
Endress+Hauser 19
4
+
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1
2
3
+
-
3
4
S1
S2
-
+
!
+
1
-
2
A0052605
 9 Electrical connection of overvoltage protection
1 Sensor connection
2 Bus terminator and power supply
Overvoltage protection function test
NOTICE
To perform the function test on the overvoltage protection module correctly:
‣
Remove the overvoltage protection module before performing the test.
‣
To do so, release screws (1) and (2) with a screwdriver and release securing screw (3)
with an Allen key.
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The overvoltage protection module can be lifted off easily.
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Perform the function test as shown in the following graphic.
1.
2.
+
-
1
2
3
S1
-
+
!
3 mm
A0033829
 10 Overvoltage protection function test
Ohmmeter in high-impedance range = overvoltage protection working .
Ohmmeter in low-impedance range = overvoltage protection defective . Inform the
manufacturer's service department. Then dispose of the defective overvoltage
protection module as electronic waste. For information on device disposal, see the
'Repair' section.