Product description
NAR300 system for high temperature
14
Hauser
3.5
Operating conditions
3.5.1
Detection sensitivity
If the electrode tip is pulled out of the lower-layer water due to increased thickness of the
oil layer, water may cling onto the electrode tip like an icicle even if the electrode tip is in
oil. In this case, detection sensitivity may increase by 1 to 2 mm (0.04 to 0.08 in). When
an accurate detection check is required, apply a small amount of neutral detergent to the
electrode tip to keep water from clinging to the electrode.
3.5.2
Pit water
The high-temperature specification is exclusively for applications in which there is always
water in the pit.
Do not use in sea water
The oil leak detector is not designed for use in sea water. The following problems may
occur if it is used in sea water:
• Failed or delayed alarm when overturned by waves
• Delayed alarm caused by generation of a bypass circuit between the conductive sensor
and the float itself due to salt coating
• Failure due to sea water corrosion
Other special pit water
If the float sensor is used in certain special pit water, such as pit water containing solvents,
it may become corroded or damaged.
Pit water with high electrical resistance
Use in pit water with high electrical resistance, such as in a steam drain and pure water,
may activate the alarm. Ensure that the conductivity of pit water is at least 10 μS/cm (not
more than 100 kΩ
･
cm).
Example: Pure water: 1 to 0.1 µS/cm (1 to 10 MΩ
･
cm)
Frozen pit water
If ice forms in the pit, the alarm may be triggered (fail-safe function). Implement anti-
freeze measures to prevent freezing.
3.6
Gasoline application
If the object to be detected is gasoline, check with your Hauser Sales Center and
order the gasoline application specifications under special specifications.
