LPPYRA-Lite
- 5 -
V1.2
3
INSTALLATION
•
The pyranometer must be mounted in an easy-to-reach location in order to clean
the dome regularly and carry out maintenance. At the same time, make sure that
no buildings, constructions, trees or obstructions exceed the horizontal plane where
the pyranometer lies. If this is not possible, select a site where obstructions in the
path of the sun from sunrise to sunset do not exceed 5 degrees of elevation.
N.B.:
The presence of obstructions on the horizon line affects significantly the
measurement of direct irradiance.
•
The pyranometer must be located far from any kind of obstruction, which might re-
flect sunlight (or sun shadow) onto the pyranometer itself.
•
In compliance with ISO TR9901 standard and WMO recommendations, the pyra-
nometer must be positioned so that its connector is pointed to the North Pole, if the
instrument is used in the Northern Hemisphere, and to the South Pole, if used in
the Southern Hemisphere.
•
For fixing, use the two holes under the pyranometer body or the suitable accesso-
ries (see the figures below). In order to allow an accurate horizontal positioning,
the optional
LPS40/32BL
fixing base integrating a levelling device can be used.
The mast height does not exceed the pyranometer plane to avoid measurement er-
rors caused by any reflection or shadow of the mast itself.
•
It is preferably to thermally insulate the pyranometer from its mounting bracket
ensuring, at the same time, a good electrical contact to ground.
•
49
Ø
40
45°
M
12
M
5 (2x)
57
55
Fig. 3.1: dimensions and fixing holes