SR05-D1A3-PV manual v1801 26/83
5 Installation of SR05
5.1 Site selection and installation
Table 5.1.1 Recommendations for installation of pyranometers
the situation that shadows are cast on the instruments
is usually not desirable. The horizon should be as free
from obstacles as possible. Ideally there should be no
objects between the course of the sun and the
instrument.
Mechanical mounting / thermal insulation
preferably use the ball levelling mount to mount SR05
to a (non-)horizontal surface. A pyranometer is
sensitive to thermal shocks. Do not mount the
instrument on objects that become very hot (black
coated metal plates).
Instrument mounting with 2 bolts 2 x M5 bolt at 46 mm centre-to-centre distance on
north-south axis, connection through the sensor
bottom in SR05’s standard configuration.
with ball levelling option: 2 x M5 bolt at 46 mm
centre-to-centre distance, connection through ball
levelling mount, M5x20 bolts and M5 nuts included.
with ball levelling on tube mount option: 2 x M5 bolt
at 46 mm centre-to-centre distance, connection
through tube and ball levelling mount, M5x30 and
M5x40 bolts included.
Performing a representative
the pyranometer measures the solar radiation in the
plane of the sensor. This may require installation in a
tilted or inverted position. The black sensor surface
(sensor bottom plate) should be mounted parallel to
the plane of interest.
In case a pyranometer is not mounted horizontally or
in case the horizon is obstructed, the
representativeness of the location becomes an
important element of the measurement. See the
chapter on uncertainty evaluation.
in case of horizontal mounting use the bubble level
and optionally the ball levelling mount. The bubble
level is visible and can be inspected at all times.
by convention with the cable exit pointing to the
nearest pole (so the cable exit should point north in
the northern hemisphere, south in the southern
hemisphere).
Installation height in case of inverted installation, WMO recommends a
distance of 1.5 m between soil surface and sensor
(reducing the effect of shadows and in order to obtain
good spatial averaging).
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