Kipp&Zonen CGR 4 Pyrgeometers - Manual (Page 18)

3.4. Housing
The radiometer housing accommodates all fundamental pygeometer parts. The anodized Aluminium
parts are light weight and give a high mechanical and thermal stability to the instrument. Due to its fine
mechanical construction all pyrgeometers are virtually sealed and comply to the international standard
IP 67. Each pyrgeometer model can be leveled by using the bubble level and two leveling feet. For ease
of maintenance the bubble level is situated next to the dome of the instrument and due to the special
shape of the sun shield it is visible from above. The sun shield acts to protects all the external parts from
radiation and to reduce solar heating of the housing.
3.5. Drying cartridge
In case moisture enters the radiometer body the silica-gel desiccant regulates the humidity level inside
the pyrgeometer. Initially the desiccant will have an orange colour. After some time it becomes saturated
with moisture and the colour will change to become clear (transparent). At this time the contents of the
drying cartridge should be replaced with fresh, unsaturated orange colored desiccant as soon as possible.
Replacement desiccant is available through Kipp & Zonen distributors.
3.6. Cable and connector
For ease of installation and replacement during recalibration of the radiometer, the CGR series are
provided with a weather proof signal cable connector.
Kipp & Zonen radiometers use a custom-made cable that is selected as a low noise type particularly
suited to handle the low voltage output of the thermopile or of a temperature sensor.
The shield of the cable is connected to the metal body of the connector and preferably should be
connected to ground at the readout equipment. Cables come pre-wired to the connector plug in a range
of lengths.
Page 18 CGR 4 Manual