Oil Leak Detector NAR 300 system
Endress+Hauser 31
8.2 Alarm delay (no alert when oil leak)
The alarm may be not output by the below reason, even if the oil leak occurs.
Condition Detail description
The wave and
convection on liquid
level
– When the water and oil layer in pit is instability because of
a deep-surge of strong wind, the conductivity sensor detects the
water in pit.
Float sensor tilt – When the float sensor is tilted heavily to one side by snow, trash or
animal on the float sensor or tangles of cable or chain, the
conductivity sensor detects the water under oil layer and the
tuning-folk sensor dose not alert because it is out of the oil layer.
Sinking of the float sen-
sor
– When the float sensor sinks by weight of snow, trash or animal on
the float, the conductivity sensor detects the water under oil layer
and does not alert.
Trash containing water – When trash or algae containing water contact between the
conductivity sensor and earth, the conductivity sensor detects the
water and does not alert.
Oil leak when it is
snowing
– When snow is floating on oil layer surface, the conductivity sensor
detects the water by snowmelt.
Gravity change of the
water in pit
– When using an antifreeze fluid to prevent freeze, detection sensitivity
is lower than usual and causes the alarm delay because the density of
the water in a pit increases and the sensor float comes up.
8 Troubleshooting
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