Vaisala Hydromet Data Collection Platform - Manual (Page 87)

Chapter 3 _____________________________________________ Configuring Modules and Sensors
VAISALA_______________________________________________________________________ 85
Fuel Moisture Sensor
The 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. The humidity measurement is based on 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. The temperature measurement uses a
10th degree polynomial to convert the NTC resistor value to
temperature.
To configure the fuel moisture sensor in Lizard, proceed as follows:
1. Open an existing setup in the Setup view or create a new one.
2. Proceed to the Equipment view.
3. Select the QFM101 sensor from the Available list and click the
Add button to insert the sensor into the setup.
4. If the connector or connectors are used, MAWS Lizard prompts
'Selected HW resource is already in use. Are you sure you want to
make this connection'.
a. Select No.
b. Double-click the text <None> in the Connector column.
c. Select an available connector.
Using Fuel Moisture Variables in Reports
In Lizard, the temperature of the fuel moisture sensor is reported from
the NTCpoly component. To check which variables are available,
proceed as follows:
1. Go to the Reports view.
2. Create a new report or select an existing one to include the
variables for the fuel moisture sensor.
3. Click NTCPoly_1 in the Available list box in the Select variables
frame.
4. Add temperature to the report.