Capacitive electrodes EL 4 … 20 mA - compact
45
28
30
32
+
–
+
–
+
–
mA
V
4 … 20 mA
12 … 20 V
Sensor
Diagnosis
5.4 Failure removal
Failure
Measure, failure removal
Current value
Check the sensor inputs on the following failures:
≥
22 mA
- shortcircuit on the input
- sensor not correctly connected
- sensor line interrupted
- supply voltage too low or too high
Measure the current on the connection line to the sensor.
The terminal voltage on the sensor in standard condition is at least 12␣ V.
Note with Ex-systems that the Ex-protection is not influenced by
the measuring instruments.
Current value > 22 mA
- Check all connections and the connection line to the sensor.
- Loosen the two small screws with a screwdriver and remove the
oscillator out of the plug connection.
- Measure the current.
•
When the current value remains > 22 mA, the oscillator is defect.
Exchange the oscillator.
•
When the current value is < 22 mA, the electrode is defect. Return
the electrode for repair.
z.B. VEGATOR
12 … 36 V
Содержание EL 11
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