Net Radiometers CNR Series

Kipp & Zonen offers a complete range of net radiometers for the measurement of incoming and outgoing short-wave (0.3 to 3 ?m) and long-wave (4.5 to >40 ?m) radiation. All types are virtually maintenance free and designed for continuous outdoor use. All instruments have a linear mV output and require no power (apart from the heater in the CNR 1). They all come with a mounting rod, bubble level, instruction sheet and calibration certificate; and meet CE requirements.

The main applications are in agrometeorology, for the study of evapotranspiration and crop damage prevention; and in climatology, meteorology and hydrology for measurement of the radiation balance. Monitoring over glaciers and ice fields is of particular interest to global warming studies. In renewable energy the heat exchange in thermal solar systems can be monitored.

CNR 1 combines two thermopile pyranometers for solar radiation measurement (incoming / reflected / albedo / balance) with two thermopile pyrgeometers for far infrared measurement (balance / ground surface temperature / sky temperature). There are four separate signal outputs and the integrated temperature sensor can be used to calculate the downward FIR radiation.

Via a data logger the temperature signal can be used to control the built-in heating element to minimize dew and frost deposition.

CNR 1 is the best net radiometer for accurate and reliable measurements and is often used as the reference instrument for a network of lower performance net radiometers. For the CNR1 a heated ventilation unit, the CNRV, is available to further minimize offsets and maximize stability.

CNR 2 is a unique design and features two separate outputs for net short-wave (solar) and net long-wave (atmospheric and terrestrial) radiation. The glass domes and silicon windows protect the two differential thermopile detectors from environmental factors, are easy to clean and minimize the effects of wind and rain. CNR 2 is supplied as standard with a high quality waterproof connector and 10 m signal cable.

CNR2
The compact, rugged and lightweight construction
with removable mounting rod makes the CNR 2 ideal
for portable field research as well as for network use.

NR Lite is a low cost net radiometer with a Teflon™ coated, weather resistant black conical absorber. A vertical stick prevents birds from affecting the measurement. NR Lite is based on a single differential thermopile sensor and has one output for the total net radiation. NR Lite is lightweight and simple and is frequently used in low cost weather and hydrology systems.