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The CM 4 Pyranometer complies with specifications according to the
ISO 9060 standard, as defined in the 'Guide to meteorological
Instruments and Methods of Observation', sixth edition, 1996, of the
World Meteorological Organisation (WMO*) – Geneva – Switzerland.
* The WMO classification is adapted from the international standard
ISO 9060 (1990).
1.2
PHYSICAL PRINCIPLES OF THE PYRANOMETER
The pyranometer basically consists of a thermopile detector,
aluminium housing, a glass dome and a special cable. The CM4 is
provided with a Pt-100 temperature sensor to monitor the
pyranometer body temperature during operation. A drawing of the
pyranometer is shown in figure 1.1.
glass dome
sensing element
temperature sensor
Circuit board
Figure 1.1: CM 4 Pyranometer construction details.
Important: To avoid entry of water vapour it is strongly
recommended not to open the bottom plate of the
radiometer under any circumstances.
10
housing
drying cartridge
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