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2. Installation and operation
2.1. Delivery
Check the contents of the shipment for completeness (see below) and note whether any damage has
occurred during transport. If there is damage, a claim should be filed with the carrier immediately. In
this case, or if the contents are incomplete, your dealer should be notified in order to facilitate the repair
or replacement of the instrument.
Contents of delivery:
1. Radiometer
2. Sun shield
3. Cable with connector
4. Test reports
5. Instruction sheet
6. Radiometer fixing kit
7. 2x Desiccant bags
8. Product documentation CD
Although all CGR radiometers are weatherproof and suitable for harsh environmental conditions, they
have some delicate mechanical parts. Please keep the original packaging for safe transport of the
radiometer to the measurement site or for use when returning the radiometer for calibration.
The calibration certificate supplied with the instrument is valid for 1 year from the date of first use by the
customer, subject to the variations in performance due to specific operating conditions that are given in
the instrument specifications. The calibration certificate is dated relative to the time of manufacture, or
recalibration, but the instrument does not undergo any sensitivity changes when kept in the original
packing and not exposed to light. From the moment the instrument is taken from its packaging and
exposed to irradiance the sensitivity will deviate slightly with time. See the 'non-stability' performance
(maximum sensitivity change per year) given in the radiometer specification list.
2.2. Mechanical installation
The mechanical installation of the radiometer depends upon the measuring purpose. Di erent measuring
methods will be explained in the next paragraphs.
2.2.1. Installation for measurement of long-wave downward radiation
The following steps must be carefully taken for optimal performance of the instrument.
1. Desiccant
Check the condition of the desiccant and replace if necessary, for example after a long storage period.
2. Location
Ideally the site for the pyrgeometer should be free from any obstructions to the horizon above the plane
of the sensing element. If this is not possible, the site should be chosen in such a way that any obstruction
over the azimuth range should have an elevation not exceeding 10°. In particular, no sources of heat
(such as ventilation / heating outlets) should be within the field of view.
Page 6
CGR 4 Manual
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