Vaisala WMS302 Guide de l'utilisateur télécharger pdf (Page 182)

User's Guide ______________________________________________________________________

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Fuel Moisture/Fuel Temperature Sensor

Periodic Maintenance

The sensing element of the 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 embedded 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 per 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.

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Vaisala WMS302 Guide de l'utilisateur Page 182