GHM Delta OHM LPPYRA13, Operating Manual

Page: 9 / 38

LPPYRA13
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V2.3
Adjusting the shadow ring tilt:
1.
Check that the sliding bars and the long side of the pyranometer support be parallel
(instruments are supplied factory aligned).
2. Mount and fix the pyranometer to the goniometer.
3. Position the goniometer in such a way to read on its scale the latitude of the instal-
lation site.
Fig. 3.5: shadow ring tilt adjustment
4. Rotate the crossbar (after loosening the screw that locks it) until the pyranometer
is parallel to the ground. Use the levelling device on the pyranometer body.
5. If the operations have been carried out properly, the shadow ring axis will be paral-
lel to the earth axis.
By now you just have to adjust the height of the sliding bars (loosening the locking
screws) until the pyranometer big dome appears completely in the shade. To confirm
that installation has been performed correctly, you can compare the reading on the
sliding bar scale with the value listed in tables 1A and 1B. If the values match, the py-
ranometer and the shadow ring have been correctly installed.
The shadow ring position has to be adjusted at least once every two days.
Angle reading