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The World Meteorological Organisation recommends that the emerging leads
are pointed to the nearest pole, to minimise heating of the electrical
connections.
However, if a polar diagram of the combined azimuth and cosine response is
available, the pyranometer may be orientated so that the solar path lies in the
low error region.
2.
Mounting
The CM 22 pyranometer is provided with two holes for 5 mm bolts.
Two stainless steel bolts and two nylon rings are provided. The pyranometer
should first be secured lightly with the bolts to a mounting stand or platform
(Shown in figure 10).
Note: After reinstallation and recalibration the nylon insulators must be
replaced with new ones to prevent corrosion.
The mounting stand temperature can vary over a wider range than the air
temperature. Temperature fluctuations of the pyranometer body can produce
offset signals. It is recommended to isolate the pyranometer thermally from
the mounting stand, e.g. by placing it on its levelling screws. But keep an
electrical contact with earth to conduct away currents in the cable shield
induced by lightning.
INSTALLATION
23
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