RAWS-P Remote Automated Weather Station
3.6 Barometric Pressure
The barometric pressure sensor is mounted to the back plate inside the RAWS
environmental enclosure.
3.7 Fuel Moisture and Fuel Temperature
The fuel moisture and fuel temperature sensor should be left outside at the field
site continually exposed to the same conditions as forest fuels. The fuel
moisture and fuel temperature dowel rods absorb and desorb moisture from its
surroundings. Install the probes horizontally on the mounting stake and face
the sensors south (northern hemisphere) above a representative forest floor duff
layer. Place the sensor away from foot traffic areas.
4. Sensor Wiring and Troubleshooting
4.1 Air Temperature and Relative Humidity
4.1.1 General Description, Air Temperature and Relative Humidity (part
#HMP45C-LQ)
The Vaisala Air Temperature and Relative Humidity Sensor (part #HMP45C-
LQ)
contains a Platinum Resistance Temperature detector (PRT) probe and a
Vaisala HUMICAP® 180 capacitive relative humidity probe. The probe
output for each sensor is a voltage.
4.1.2 Wiring, Air Temperature and Relative Humidity (part #HMP45C-LQ)
The temp/RH sensor is connected to the RAWS connector panel “TEMP/RH”
connector COLOR CODED ORANGE. This sensor is internally wired from
the RAWS connector panel to the CR1000 datalogger.
Connector Panel “TEMP/RH” connector COLOR CODED ORANGE
Connector Pin A Temp Hi
to CR1000 1L
Connector Pin B Sensor excitation
to CR1000 EX1
Connector Pin C Sensor signal Lo/AG to CR1000 AG
Connector Pin D Power ground
to CR1000 Ground
Connector Pin E RH signal
to CR1000 1H
Connector Pin F SW_12V
to CR1000 SW_12V
4.1.3 Troubleshooting, Air Temperature and Relative Humidity (part
#HMP45C-LQ)
Check the sensor cable. Disconnect the connector and look for damaged pins.
Verify that the sensor body is connected to the sensor head. Under the filter
assembly, verify the sensors are connected but not touching. Try connecting a
substitute sensor. Obtain a Return Material Authorization (RMA) number
before returning this sensor to Campbell Scientific for repair.
Consult the HMP45C-L manual for more information.
NOTE
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Summary of Contents for RAWS-P
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