EKO INSTRUMENTS CO., LTD. - Pyranometers MS-802/802F/402/402F/602 - Instruction Manual Ver.13
In order to obtain representative measurements from pyranometers, several criteria with respect to setup and
mounting of the instruments have to be considered*:
The ideal mounting position for pyranometers is a location which has a full hemispheric field-of-view without
any obstructions (such as buildings, trees, and mountain). In practice, it might be difficult to find such
locations. Therefore, some practical recommendations on how to minimize undesired effects of reflecting or
obstructing surfaces are given next:
Select a mounting position which it is free from obstructions at 5° above horizon.
The setup location should be easily accessible for periodic maintenance (glass dome cleaning,
desiccant replacement, etc.).
Avoid surrounding towers, poles, walls or billboards with bright colors that can reflect solar radiation
onto the pyranometer.
A strong physical impact to the pyranometer can lead to product damage and/or may cause changes
to the sensitivity.
*See also the attached Quick Start Guide for comprehensive setup instruction details.
1. Installing at Horizontal or Tilted Positions
1) Check the installation base where the pyranometer has to be mounted and make sure it has two
fixing holes with the appropriate pitch. The pitch sizes of the fixing holes are as follows (in mm):
Table 5-2. Fixing Hole Pitch and Bolt Size for Pyranometers
2) Setup the pyranometer with the signal cable connector facing the nearest Earth’s pole.
In the Northern hemisphere, the connector should be orientated North, in the Southern hemisphere,
the connector should be orientated South.
3) Remove the sun screen by turning it clockwise.
When removing or attaching the sun screen, always turn the sun screen clockwise. If it is turned
counterclockwise, the glass dome part will become loose and moisture may leak into the housing of
the pyranometer, which may cause condensation and degradation of the instrument.
4) Adjust the pyranometer in a horizontal position by using the 2 leveling screws (MS-802/402,
MS-802F/402F) or 3 leveling screws (MS-602) and observing the air bubble in the spirit level while
manipulating the leveling screws. The instrument is leveled horizontally if the air bubble is in the
center ring.
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