Campbell CVF4 Spezifikationen PDF herunterladen (Seite 36)

CNR4 Net Radiometer

9.2 Recalibration

For quality assurance of the measured data, the manufacturer recommends the

CNR4 be recalibrated on a regular schedule by an authorized Kipp & Zonen

calibration facility.

The CNR4 should be recalibrated every two years. Alternatively, one can

check the sensor calibration by letting a higher standard run parallel to it over a

two-day period and, then, comparing the results. For comparison of

pyranometers, one should use a clear day. For comparison of pyrgeometers,

one should compare the nighttime results. If the deviations are greater than 6%,

the sensor should be recalibrated.

Please contact Campbell Scientific to obtain an RMA number for recalibration.

9.3 Replacing the Drying Cartridge

The CNR4 has a drying cartridge inside the sensor to help keep the electronics

dry. The manufacturer recommends that this drying cartridge be replaced

every 6 to 12 months. The three screws holding the white solar shield and the

6 screws holding the aluminium base plate need to be removed to access the

drying cartridge, as shown in Figure 9-1 below. Make sure that the black

rubber gasket is put in place properly before the base plate is put back to keep

the compartment sealed. The CNR4 comes with two spare drying cartridges.

Additional drying cartridges (CSI p/n 26006, CNR4 Replacement Drying

Cartridge) can be purchased from Campbell Scientific.

FIGURE 9-1. Replacing the Drying Cartridge

Rubber Gaske

Drying Cartridge

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Campbell CVF4 Spezifikationen Seite 36