Campbell Scientific CMP6-L, CMP11-L, and CMP21-L Pyranometers - Manual (Page 10)

CMP6-L, CMP11-L, and CMP21-L Pyranometers
3.1 Ships With
(2) Bolts for mounting from original mfg
(1) Instruction Manual from original mfg
(1) Sun Shield from original mfg
(2) Nylon washers from original mfg
3.2 Calibration Certificate
Each pyranometer is shipped with an instruction manual provided by Kipp &
Zonen that contains information concerning its construction, spectral
sensitivity, cosine response, and a simple sensor check out procedure. Included
with the sensor and manual is a calibration certificate with the sensor
sensitivity value and serial number.
Cross check this serial number against the serial number on your
pyranometer to ensure that the given sensitivity value
corresponds to your sensor. NOTE
4. Quick Start
Appendix A, CVF3 Heater/Ventilator, provides the installation
procedure for the CVF3 ventilation unit. NOTE
4.1 Siting
The pyranometer is usually installed horizontally for global horizontal
measurements. However, the pyranometer can be installed at any angle for
POA measurements and in the inverted position for reflected measurements. In
all cases it will measure the solar flux incident on the sensor surface.
Site the pyranometer to allow easy access for maintenance while ideally
avoiding any obstructions above the plane of the sensing element. It is
important to mount the pyranometer 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); see FIGURE 4-1 through FIGURE 4-4.
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