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CNR4 Net Radiometer

Two temperature sensors, a thermistor and a Pt-100, are integrated with the

CNR4 body. The temperature sensor is used to provide information to correct

the infrared readings for the temperature of the instrument housing. Care has

been taken to place the long-wave sensors close to each other and close to the

temperature sensors. This ensures that the temperatures of the measurement

surfaces are the same and accurately known, improving the quality of the long-

wave measurements. A completion resistor is added in the pig tail end of the

thermistor cable providing an easy interface with dataloggers for half-bridge

measurement.

The CNR4 design is light weight and has an integrated solar shield that reduces

thermal effects on both the short-wave and the long-wave measurements. The

cables are made from Santoprene jacket, which is intended for outdoor use,

and is resistant to a variety of pollutants and UV-radiation. The mounting rod

can be unscrewed for transport.

An optional ventilation unit with a heater, CNF4, is designed as an extension of

the solar shield and can be fitted to the CNR4 or retrofitted later. The

heater/ventilation unit is compact and provides efficient air-flow over the

domes and windows to minimize the formation of dew and to reduce the

frequency of cleaning. The integrated heater can be used to melt frost.

The CNR4 design is such that both the upward facing and the downward-

facing instruments measure the energy that is received from the whole

hemisphere (180° field of view). The output is expressed in W/m

. The total

spectral range that is measured is roughly from 0.3 to 42 μm. This spectral

range covers both the short-wave solar radiation, 0.3 to 2.8 μm, and the long-

wave far infrared radiation, 4.5 to 42 μm. The gap between these two produces

negligible errors.

The CNR4 is manufactured by Kipp & Zonen, but cabled for use with

Campbell Scientific dataloggers. Its cables can terminate in:

• Pigtails that connect directly to a Campbell Scientific datalogger

(cable termination option –PT).

• Connector that attaches to a prewired enclosure (cable termination

option –PW).

6. Specifications

Features:

• Research-grade performance

• Meniscus dome on upper long-wave detector allows water droplets to

easily roll off of it and increases field of view to nearly 180°

• Internal temperature sensors provide temperature compensation of

measurements

• Drying cartridge helps keep the electronics dry

• Compatible with the CNF4 ventilation unit with heater that reduces

formation of dew and melts frost

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