Kipp&Zonen CM 4 Pyranometer - Manual (Page 23)

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3.2.1 Outdoor installation
When installed permanently, the pyranometer can be attached to its
mounting platform by means of the holes that are drilled through the
body, see figure 2.1.
Preferred orientation is with the cable pointing to the nearest pole.
When installed on a mast, preferred orientation is such that no
shadow is cast on the pyranometer during any time of the day. In the
Northern hemisphere this implies that the pyranometer should be
south of the mast.
The pyranometer can be used to measure reflected radiation, for
instance when pointed towards the earth in the inverted position.
When measuring reflected radiation (as an albedometer) it is advised
to do this at a height of at least 1.5 meters above the surface, to
avoid shading effects and to promote spatial averaging.
3.2.2 Indoor installation
When continuously used for indoor purposes the instrument should
preferably be attached to a mounting platform by means of the holes
that are drilled through the body, see figure 2.1. However, this might
not always be possible, for instance if the instrument is relocated or
moved regularly. What is recommended in these cases is to relocate
the instrument in the same place as much as possible, attempting to
repeat the same measurement conditions e.g. with respect to a fixed
offset from a light reflecting wall or any other object.
In the case of measuring the light irradiance on tilted surfaces it is
recommended to tilt and fix the radiometer at the same inclination as
the surface.