SR05-D1A3-PV manual v1801 61/83
8 Maintenance and trouble shooting
8.1 Recommended maintenance and quality assurance
SR05 can measure reliably at a low level of maintenance in most locations. Usually
unreliable measurements will be detected as unreasonably large or small measured
values. As a general rule this means that regular visual inspection combined with a
critical review of the measured data, preferably checking against other measurements, is
the preferred way to obtain a reliable measurement.
Table 8.1.1 Recommended maintenance of SR05. If possible the data analysis and
cleaning (1 and 2) should be done on a daily basis. (continued on next page)
MINIMUM RECOMMENDED PYRANOMETER MAINTENANCE
1 1 week data analysis compare measured data to maximum possible / maximum
expected irradiance and to other measurements nearby
(redundant instruments). Also historical seasonal records can
be used as a source for expected values. Analyse night time
signals. These signals may be negative (down to - 5 W/m
2
on
clear windless nights), due to zero offset a. In case of use with
PV systems, compare daytime measurements to PV system
output. Look for any patterns and events that deviate from
what is normal or expected
use a soft cloth to clean the dome of the instrument,
persistent stains can be treated with soapy water or alcohol
3 6 months inspection inspect cable quality, inspect connectors, inspect mounting
position, inspect cable, clean instrument, clean cable, inspect
levelling, change instrument tilt in case this is out of
specification, inspect mounting connection, inspect interior of
dome for condensation
4 2 years desiccant
replacement
desiccant is specified to last for minimum 2 years. In case the
user wants to replace desiccant himself, this is at own risk and
should only be executed in an ESD-safe work environment.
The bottom plate of SR05 should be removed by unscrewing 3
x T10 screws with a Torx 10 screwdriver. The desiccant bag is
taped on the bottom plate of SR05. Care should be taken
when mounting the bottom plate on SR05
5 2 years recalibration recalibration by side-by-side comparison to a higher standard
instrument in the field according to ISO 9847
request “power user” status and a password at the factory
permitting to write to registers holding the sensitivity and the
calibration history data via the Sensor Manager
6 lifetime
assessment
judge if the instrument should be reliable for another 2 years,
or if it should be replaced
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