Oil Leak Detector NAR 300 system
Endress+Hauser 33
8.3.2 Problem between Transmitter and Alarm system
Please check the status lamp (LED).
Condition Countermeasure
LED red luminescent :
normal alarm
• Even though the voltage for sensor is not detected, the alarm is
output. If there is not any wiring problem between a transmitter and
a Sensor I/FEx box, please replace a transmitter.
LED green luminescent :
alarm signal from sensor is
not output
• When the alarm is output in condition of the left column, please
check the resistance value on the alarm output terminal in the
transmitter in the following order.
1: Power off in the alarm system
2: Remove the wire for alarm output from transmitter.
3: Check that LED is emitting light (green) continuously
4: Measure the resistance value between NO (or NC) and COM
NO connection:
If the resistance value is 0Ω, it is OK, but other than 0Ω, change the
transmitter.
NO connection:
If the resistance value is 20Ω and more, replace the transmitter.
LED non-luminescent :
transmitter is power-off
• If the regular voltage is measured between terminal L and N on the
transmitter, replace the transmitter.
• If the regular voltage is not measured between terminal L and N on
the transmitter, check the power supply and power cable in the
transmitter.
8 Troubleshooting
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