Vaisala MAWS201 User's Guide Page 148

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User's Guide _______________________________________________________________________
146 __________________________________________________________________ M210243en-A
QMS102
The pyranometer is an all weather instrument. Once installed the
pyranometer needs little maintenance. It is recommended that you
clean the detector as part of a regular routine, using water or alcohol.
Re-calibration is suggested every two years. This can be done in two
ways. The first is to compare with the measurement of a similar sensor
at the same site. Daily totals of at least two days should be compared.
Calibration factor should be corrected if results differ by more than six
per cent. The second way is to let a re-calibration be performed at the
factory.
QMN101
The net radiometer is an all weather instrument. Once installed it
needs little maintenance. It is recommended that you clean the
detector as part of a regular routine, using water or alcohol.
Re-calibration is suggested every two years, preferably by letting a
higher standard run parallel to it for two sunny days, and by
comparing the daily totals over several days. The calibration factor
could be corrected if the results differ by more than five percent. The
reference could be a net radiometer type CNR1, or a QMN101 that is
kept safely in a cupboard.
Another way of checking sensor performance during field use is to put
the sensor upside down during stable atmospheric conditions.
Theoretically, the sensor output should change sign. Please mind that
the sensor response time for stabilizing is about one minute. This
method is no more accurate than 20% due to the fact that the sensor
symmetry is no more accurate than this.
A third way is to let a re-calibration be performed at the factory.
Soil Temperature Sensors
QMT103
The probe does no need any regular maintenance. Field repairs are
accomplished by replacing the complete probe.
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