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1.
GENERAL INFORMATION
The CV 2 ventilation unit is meant for ventilating solar radiation sensors and
can be used outdoors under all weather conditions. The CV 2 is available with
and without heater. An optional power supply can order separately.
The reliability and accuracy of solar radiation measurement can be improved
by using artificial ventilation.
The main advantages of ventilating are:
1.
Prevention of precipitation of dew and frost which otherwise
would disturb the measurement.
2.
Suppression of the infrared offset, which is produced e.g. by
cooling down of the glass domes under calm clear sky conditions.
Under extreme conditions, it can be necessary to heat the ventilation air. If the
temperature of the ventilation air does not exceed the temperature of ambient
air by 1 K, offset problems are not significant.
The ventilation system CV 2 is meant to be used with the Kipp & Zonen
pyranometers (CM 11, CM 6B, CM 21 and CM 22) and with radiation sensors
with equal dimensions like the pyrgeometers (CG 1 and CG 4) and the UV-
radiometers (CUVA 1, CUVB 1, CUV 3).
The CV 2 can be ordered with or without heater. The optional power supply
can be used for both versions.
The ventilator of the CV 2 must run continuously. The heating can be
connected for 5 or 10 Watt. Without heating the temperature of the instrument
is maintained near to that of ambient air.
The ventilation unit is suited for placement on the 2AP Tracking system.
The ventilation system does not prevent the dome to become filthy.
The ISO Technical Report 9901 "Solar Energy - Field Pyranometers
Recommended Practice For Use" contains an informative chapter on
ventilation systems in general.
INSTRUCTION MANUAL CV 2
GENERAL INFORMATION
5
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