CNF4-LVentilation and Heater Unit for CNR4

Overview

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 data logger 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.