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4
OPERATION
After completing the installation the pyranometer will be ready for operation.
The irradiance value (E
↓ Solar
signal (U
) of the pyranometer by its sensitivity (S
emf
multiplication of the voltage value with the reciprocal of the sensitivity. (Often
called the calibration factor).
For calculation of the solar irradiance the following formula must be applied:
U
emf
=
E
↓
Solar
S
ensitivity
E
= Global radiation
↓ Solar
U
= Output of pyranometer
emf
S
= Sensitivity of pyranometer
ensitivity
To be certain that the quality of the data is of a high standard, care must be
taken with daily maintenance of the pyranometer. Once a voltage measurement
is taken, nothing can be done to retrospectively improve the quality of that
measurement.
Many years of experience has shown that pyranometer performance can be
improved concerning the zero offset type A by using a proper ventilation system.
The Kipp & Zonen CV 2 ventilation unit is recommended as an optimal
combination to minimise or eliminate this remaining error.
) can be simply computed by dividing the output
ensitivity
(formula 1)
OPERATION
) formula 1, or by
2
[W/m
]
[µV]
2
[µV/W/m
]
33
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