User's Guide _______________________________________________________________________
148 __________________________________________________________________ M210243en-A
CAUTION
The drying detergent is very important to ensure reliable performance
of the water level sensor. Otherwise humidity enters the sensor casing
through the ventilation pipe inside the cable and causes severe
damage to the sensor.
Leaf Wetness Sensor
The QLW101 Leaf Wetness Sensor does not need any regular
maintenance. Field repairs are accomplished by replacing the
complete probe.
Fuel Moisture Sensor
The sensing element of QFM101 Fuel Moisture sensor is a wooden
dowel that exchanges moisture with its surroundings. In the course of
a year, it undergoes many cycles of soaking up moisture and drying.
These processes eventually cause the structure of the wood to
deteriorate. Similarly, dust and other contaminants become imbedded
in the surface and they change the surface properties. When this
occurs, the calibration is no longer valid.
The only way to restore the sensor accuracy is to replace the wooden
dowel, which must be done at the factory.
Your experience will eventually determine how frequently the sensor
needs service. At the beginning, the manufacturer recommends that
you return it to the factory once a year for replacement of the dowel
and calibration.
At most sites, where the sensor is used to assess fire danger, there is a
season when the danger is low. That is usually a good time to replace
or refurbish the sensor.
Cable Maintenance
Inspect cables for breaks, cracks in the protective coating or cable
connectors, and bent, damaged, or misaligned pins. Also wipe off or
remove excess dirt, dust, sand, or leaves.
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