Mounting; Orientation; Levelling; Securing - Kipp & Zonen SMP series Instruction Manual

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2.4.2 Mounting

The SMP pyranometer is provided with two holes for 5 mm bolts. Two nylon insulation rings and two each of stainless steel bolts,
washers and nuts are provided in the fixing kit. The pyranometer should first be secured lightly with the bolts to a solid and
stable mounting stand or platform as shown below. The nylon insulators are important to prevent corrosion between the screws
and the pyranometer housing.
The mounting stand temperature may vary over a wider range than the air temperature. Temperature fluctuations of the
pyranometer body can produce o set signals, therefore it is recommended to isolate the pyranometer thermally from the
mounting stand by placing it on its three feet. Ensure that there is a good electrical contact with the ground to conduct away
currents in the cable shield induced by lightning.
h
Note After recalibration and/or reinstallation ensure that the nylon insulators are refitted.

2.4.3 Orientation

In principle no special orientation of the instrument is required, although the World Meteorological Organisation (WMO) recommends
that the signal lead (connector) is pointed towards the nearest pole, to minimise heating of the electrical connections. This is also
where any mounting pole, or other support, should be located in order that shadows do not fall on the instrument.

2.4.4 Levelling

Accurate measurement of the global radiation requires proper levelling of the detector surface. Level the instrument by turning
the two adjustable feet to bring the bubble of the spirit level centrally within the marked ring. For easy levelling, first use the
screw nearest to the spirit level.
Note It is ideal that the bubble should be completely within the marked ring. However, in fact, the pyranometer is level
within the specified accuracy when the bubble is at least half within the ring.

2.4.5 Securing

Secure the pyranometer tightly with the two stainless steel bolts. Use the two nylon insulators to avoid contact between the
aluminium body and the steel screws. Ensure that the pyranometer maintains the correct levelled position when it is tightened.
M5 x 80 mm screw (2x)
Nylon insulation rings (2x)
>10 x h
Ø 5.2 mm (2x)
Flat washer (2x)
Nut (2x)
65 mm
15