User`s guide

Chapter 4 ______________________________________________________________ Maintenance
VAISALA______________________________________________________________________ 159
When the blue silicagel in the drying cartridge is turned completely pink
(normally after several months), it must be replaced by active material.
Pink silicagel can be activated again in an oven at 130 °C.
Because the sensitivity changes with time and exposure to radiation, re-
calibration is suggested at least every two years at the factory.
Net Radiometer
Periodic Maintenance
The Net Radiometer CNR1 is an all-weather instrument.Once installed
it needs little maintenance. It is suggested that one clean the windows
and domes as part of a regular routine, using water or alcohol.
For quality assurance of the measurement data, we recommend the
recalibration of the CNR 1 as part of a regular maintenance schedule.
Recalibration is suggested every two years.
Net Solar Radiation Sensor
Periodic Maintenance
The Net Radiation Sensor 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.
Soil/Water Temperature Sensors
Periodic Maintenance
The QMT103/QMT110 sensor does not need any regular maintenance.
Field repairs are accomplished by replacing the complete sensor.