Campbell Scientific CMP3 Pyranometer - Manual (Page 6)

CMP3-L Pyranometer
Temperature Dependence of
sensitivity:
+ 5% (-10º to + 40ºC)
Tilt response (+80º) (at 1000 W/m 2 ): < + 2%
OTHER SPECIFICATIONS
Expected accuracy for daily sums: + 10%
Spectral range (50% points, nm): 310 to 2800 nm
Sensitivity: 5 to 20 μV W -1 m 2
Typical signal output for atmospheric
applications:
0 to 15 mV
Impedance: 30 to 100 Ω
Operating Temperature: -40º to +80ºC
Max. irradiance: 2000 Wm -2
Detector: Copper-constantan multi junction
thermopile
Level accuracy: 1 degree
DIMENSIONS / SHIPPING DIMENSIONS
CMP3-L: 3 in dia x 4 in / 8x12x4 in
WEIGHT/SHIPPING WEIGHT
CMP3-L: 1.2 lbs / 1.8 lbs
3. Installation
The CMP3-L is usually installed horizontally, but can also be installed at any
angle including an inverted position. In all cases it will measure the flux that is
incident on the surface that is parallel to the sensor surface.
Site the CMP3-L to allow easy access for maintenance while ideally avoiding
any obstructions above the plane of the sensing element. It is important to
mount the CMP3-L such that a shadow will not be cast on it at any time.
If this is not possible, try to choose a site where any obstruction over the
azimuth range between earliest sunrise and latest sunset has an elevation not
exceeding 5
°. Diffuse solar radiation is less influenced by obstructions near
the horizon. For instance, an obstruction with an elevation of 5 ° over the
whole azimuth range of 360 ° decreases the downward diffuse solar radiation
by only 0.8%.
The sensor should be mounted with the cable pointing towards the nearest
magnetic pole, e.g., in the Northern Hemisphere point the cable toward the
North Pole.
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