GREEN TEST-FTV 100
English
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14. PRODUCING A CABLE USING THE RS232
CONNECTORS PROVIDED WITH THE OPTIONAL
REMOTED FTV 100 MODULE
15. TECHNICAL CHARACTERISTICS OF THE
PYRANOMETER
WARNING, DANGER!
The user must take care not to connect the metallic parts of the pyranometer to a hazardous voltage.
15.1 INTRODUCTION
The LP PYRA 03 pyranometer measures the insolation on a plane surface (W/m²). The insolation measured
is the sum of the direct solar radiation and the diffuse radiation (total radiation).
15.2 OPERATING PRINCIPLE
The operation of the LP PYRA03 pyranometer is based on a thermopile sensor. The sensitive zone of the
thermopile is covered by a thin coat of black paint to make the response of the pyranometer to different
wavelengths unselective. The spectral band of the pyranometer is determined by the emission of a K5 type
glass dome.
The radiant energy is absorbed by the blackened surface of the thermopile, creating a temperature
difference between the centre of the thermopile (hot junction) and its body (cold junction). The temperature
difference between the hot and cold junctions is converted into a difference of potential by the Seebeck
effect.
