Oil Leak Detector NAR 300 system
30 Endress+Hauser
8Troubleshooting
Alarm output logic
8.1 Fail safe (alert when not oil leak)
The alarm may be output by the below reason, even if the oil leak does not occur.
Condition Detail description
The water freezing in a
pit
– When the water in pit freezes, the conductivity sensor judges it as
an insulator
Float sensor tilt – With the float sensor floating on the water in a pit, when the
conductivity sensor tilts and rises out of the water, the sensor judges
it as "an insulator (air)" .
– In case of the empty pit and the same condition (tilt) as the above,
tuning-fork sensor detects a liquid first, and conductivity sensor
detects insulator (air).
Trash on the bottom of
an empty pit
– When the water level rises because of rain from empty pit and
materials with a certain level of strength such as broken styrofoam
are at the end of tuning-folk sensor, the sensor judges it as a liquid
and the conductivity sensor detects an insulator (air).
– When the conductivity sensor is covered with insulators such as a
vinyl sheet or plastic bag, the conductivity sensor detects an insulator
(air) and the tuning-folk sensor detects a liquid (water).
The sensor buried in
mud
– When the float sensor is buried in mud, and it hardens and dries, the
tuning-folk sensor judges it as a liquid and the conductivity sensor
detects an insolator (air) by air space of field moisture loss.
Snow covering the
sensor
– In the empty pit, when the sensor is covered with snow, the
conductivity sensor detects an insulator and the tuning-folk sensor
detects a liquid.
The water in pit which
close equivalent to pure
– In case of the water in pit has high resistance such as drain water, the
conductivity sensor detects an insulator.
Conductivity
Tuning-fork
OFF
ON
ON ON
ONOFF
Alarm output
Water
Air
Oil
Condition
Sensors
8 Troubleshooting
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