Campbell Scientific RAWS-P Remote Automated Weather Station - Manual (Page 18)

RAWS-P Remote Automated Weather Station
4.4.2 2-D WindSonic
4.4.2.1 General Description
The Gill Instruments 2-D Sonic Wind Sensor (pn WindSonic4-LQ) is an
ultrasonic anemometer for measuring wind direction and wind speed. It uses
two pairs of orthogonally oriented transducers to sense the horizontal wind.
The transducers bounce the ultrasonic signal from a hood, minimizing the
effects of transducer shadowing and flow distortion. The 2-D Sonic Wind
Sensor makes wind measurements at a frequency of 1 Hz and outputs a SDI-12
signal to the datalogger.
4.4.2.2 Wiring
The WindSonic4-LQ attaches to the connector labeled SDI-12; this connector
is color coded red. The sensor is internally wired from the RAWS connector
panel to the CR1000 datalogger.
TABLE 4-5. SDI-12 Connector (color coded yellow)
Connector Pin Description CR1000 Terminal
A SDI-12 Signal C7
B 12 V 12V
C Power Ground G
4.4.2.3 Troubleshooting
If a problem is suspected, check the sensor cable. Disconnect the connector
and look for damaged pins. Try connecting a substitute sensor. Should the 2-
D sonic sensor be damaged, fails to output data, or sends a nonzero diagnostic,
obtain an RMA number before returning this sensor to Campbell Scientific for
repair.
Consult the WINDSONIC4-L manual for more information. NOTE
4.5 Barometric Pressure
4.5.1 General Description
The Setra Barometric Pressure Sensor (pn CS100-QD) is a capacitive pressure
transducer that uses Setra’s electrical capacitor technology for barometric
pressure measurements over the 600 to 1100 millibar range. The CS100 is
supplied in the triggered mode, in which the datalogger switches 12 Vdc power
to the barometer before the measurement. The datalogger then powers down
the barometer after the measurement to conserve power.
10