Vaisala WMS302 Podręcznik Użytkownika Strona 181

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Chapter 6 ______________________________________________________________ Maintenance
VAISALA______________________________________________________________________ 179
Soil Moisture Sensor
Periodic Maintenance
The ECH
2
O-M3 sensor is sealed after the factory calibration. It does not
require any routine maintenance and it is constructed of materials
selected for robust field operation.
Submersible Water Level Sensor
Periodic Maintenance
To ensure reliable and accurate measurements, we recommend that
during each visit to the Water Level Sensor the following checks be
made:
1. Check the drying detergent through the window of the junction
box.
2. If the drying detergent has turned red, change the cartridge. The
cartridge has reached its internal maximum absorption of humidity.
Replace the cartridge and adjust the interval for the next visit.
Leaf Wetness Sensor
Periodic Maintenance
Leaf Wetness Sensor does not need any regular maintenance. Field
repairs are accomplished by replacing the complete sensor.
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.
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