Campbell Scientific RAWS-P Remote Automated Weather Station - Manual (Page 14)

RAWS-P Remote Automated Weather Station
3.3 Precipitation
A rain gage should be located over an open level area covered by short grass,
or where grass does not grow, the natural earth surface. Level the rain gage.
Take off the funnel and remove the rubber band securing the
tipping bucket mechanism during transport. NOTE
3.4 Solar Radiation
A solar radiation sensor should be located to avoid shadows on the sensor at
any time. Orient the solar radiation sensor towards the equator minimizing the
chance of shading from other weather station structures. Reflective surfaces
and sources of artificial radiation should be avoided. Level the solar radiation
sensor.
3.5 Wind Speed and Direction
A wind sensor should be located over open level terrain and at a distance of at
least ten times (EPA) the height of any nearby building, tree, or other
obstruction.
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 towards the equator 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
The HC2S3 Rotronic’s HydroClip2 Air Temperature and Relative Humidity
Probe has a -RQ cable termination option that allows it to connect to the
RAWS-P. This probe contains a Platinum Resistance Thermometer (PRT) and
a Rotronic’s IN1 capacitive relative humidity sensor. Voltage is output for
each of the probe’s sensors.
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