Chapter 2 ___________________________________________________________Product Overview
VAISALA ________________________________________________________________________ 39
Leaf Wetness Sensor
0105-027
Figure 24 QLW101 Leaf Wetness Sensor
QLW101 Leaf Wetness Sensor enables MAWS to detect the presence
of surface moisture on foliage and calculate the duration of wetness.
When moisture is present, the sensor detects an electrical resistance
change between the gold-plated elements of the grid.
Fuel Moisture Sensor
QFM101 Fuel Moisture Sensor measures the moisture content of the
material on the forest floor or other natural area to help forest
managers assess the fire danger. It uses a carefully selected and
prepared pine dowel to exchange moisture with the environment. The
sensor measures the moisture content of the dowel by its electrical
capacitance.
A thermistor, located in the dowel where it fastens to the base,
measures the temperature of the dowel giving the estimated
temperature on the forest floor. This measurement is available as a
second input to the controlling data acquisition system.
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