CNR4 Net Radiometer
30
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,
CNR4 Replacement Drying Cartridge) can be purchased from Campbell Scientific.
Figure 9-1. Replacing the Drying Cartridge
9.4 Replacement Parts
The following is the list of replacement parts for the CNR4 and CNF4
(heater/ventilator) available from Campbell Scientific.
Description
Replacement SOLAR cable for CNR4 radiation measurements
Replacement TEMP cable for CNR4 temperature measurement
Replacement Power cable for CNF4 heater/ventilator
Mounting Rod
Replacement Drying Cartridge
Replacement Fan Filter for CNF4 heater/ventilator (set of 5). See Appendix B for
fan filter replacement instruction.
Rubber gasket
