Campbell Scientific RAWS-F Remote Automated Weather Station for Fire Weather - Manual (Page 20)

RAWS-F Remote Automated Weather Station for Fire Weather
4.4.2 Wiring
The CS300-LQ attaches to the connector labeled SOLAR RAD SDI-12; this
connector is color coded green. The pyranometer is internally wired from the
RAWS connector panel to the CR1000.
TABLE 4-3. SOLAR RAD SDI-12 Connector (color coded green)
Connector Pin Description CR1000 Terminal
A Solar Sensor + 3H
B Solar Sensor - 3L shorted to
C Solar Sensor Ground
D SDI-12 Ground G (used for a second SDI-12
sensor)
E SDI-12 Signal C5 (used for a second SDI-12
sensor)
F SDI-12 12 V 12V (used for a second SDI-12
sensor)
4.4.3 Maintenance
The pyranometer must be kept clean. Routinely check for and remove any
foreign material, dust or debris on the sensor head. The debris can be removed
with a blast of compressed air or with a soft bristle, camel hair brush. Handle
the sensor carefully when cleaning. Be careful not to scratch the surface of the
sensor.
4.4.4 Calibration
Recalibrate the pyranometer annually. Obtain an RMA number before
returning this sensor to Campbell Scientific for recalibration.
4.4.5 Troubleshooting
If a problem is suspected, check the sensor cable. Disconnect the connector
and use a DVM to check the voltage between Pin A Solar Sensor (+) and Pin B
Solar Sensor (-). The voltage should be 0 to 200 mV for 0 to 1000 W m
-2
radiation. No voltage indicates a problem with either the photodiode or the
shunt resistor, both of which are potted in the sensor head and cannot be
serviced. Try connecting a substitute sensor. Obtain an RMA number before
returning this sensor to Campbell Scientific for repair.
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