Xylem WE100 BAROMETRIC PRESSURE TRANSMITTER - Manual (Page 7)

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V. Solar Radiation Sensor
a. Solar Radiation sensor specifications.
Output: 4-20mA
Range: 0-3000 Wm 2
Accuracy: 1% of full scale
Operating Voltage: 10-36VDC
Current Draw: Same as sensor output
Warm Up Time: 3 seconds minimum
Operating Temperature: -40°C to +55°C
Size of Probe: 3" diameter x 1 1/2" high
Weight: 1/4 lb.
b. The sensor is a two-wire sensor using the red wire for power and the
black wire for the output signal. Warning: Always connect the
sensor with the power turned off.
c. Ensure that the sensor is placed on a level surface, use the alignment
bolts to adjust the sensor until it is level. Remove the red cap to begin
taking readings.
d. The solar radiation sensor or pyranometer is an instrument for
measuring solar radiation received from a whole hemisphere. It is
suitable for measuring global sun plus sky radiation. Solar radiation
varies significantly among regions. Season and time of day are major
considerations, but surrounding terrain elevation, man-made
obstructions, and surrounding trees can also cause large variations in
locations with a small area. Often, the required measurement is,
energy flux density of both direct beam and diffuse sky radiation
passing through a horizontal plane of known unit area (i.e., global sun
plus sky radiation).
e. Calibration should be confirmed annually.