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The CNF4, manufactured by Kipp & Zonen, is a heater/ventilation unit that fits onto the CNR4 Net Radiometer. It provides efficient air-flow over the domes and windows, which minimizes the formation of dew and reduces the frequency of cleaning. The integrated heater melts the frost.
Note: Beginning in May of 2016, the CNF4 design was changed from a four-wire connection to an eight-wire connection. The electrical specifications for the heater, ventilator, and tachometer output are identical for the four-wire and eight-wire versions. The only difference between them is the connector layout. The eight-wire version has an added opto-coupler in the tachometer output, which minimizes the voltage drop over the ground line and maximizes the usable cable length. Depending on the datalogger that is used with the CNR4-L and the older, four-wire version of the CNF4-L, the tachometer output may not work for 25-m (82-ft) or 50-m (164-ft) cables.
The CNF4 is a heater/ventilation unit that fits onto the CNR4 Net Radiometer. It provides efficient air-flow over the domes and windows, which minimizes the formation of dew and reduces the frequency of cleaning. The integrated heater melts the frost.
| Heater Power Consumption | 10 W @ 12 Vdc (15 Ω) |
| Ventilator Power Consumption | 5 W (@ 12 Vdc) |
| Ventilator Supply Voltage | 8 to 13.5 Vdc |
| Operating Temperature Range | -40° to +80°C |
| Length | 16.8 cm (6.6 in.) |
| Height | 4.7 cm (1.9 in.) |
| Weight | 0.5 kg (1.1 lb) without cable |
The CNF4 is used with the CNR4-L.
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