Pyrgeometer CGR3

Pyrgeometer CGR3
The radiation from the sun is mainly shortwave in the range of 300 to 4000 nm (4 μm), including visible and UV radiation. A part of this radiation is absorbed by the clouds, aerosols and molecules in the atmosphere, which thereby heats up and emits long-wave radiation. This is the far-infrared heat energy (FIR) in the range from 4.5 μm to over 40 μm. Both, the short-wave and the long-wave radiation, reach the earth. A part of this is reflected, the remaining radiation heats up the earth's surface. This, in turn, gives rise to long-wave heat energy.

The ratio of incoming and outgoing short and long wave radiation is called energy balance. The short-wave radiation is measured with pyranometers / SMP pyranometers, the long-wave with pyrgeometers.

The Kipp & Zonen Pyrgeometer CGR3 complies with WMO (World Meteorological Organization) guidelines and is traceable to WISG (World Infrared Standard Group) in Davos, Switzerland.

The CGR3 Pyrgeometer is equipped with a silicon dome that allows infrared radiation to pass through, but blocks the short-wave solar radiation, preventing it from reaching the broad-spectrum thermocouple element.

A 10K thermistor (Pt-100 optional) is installed in the Pyrgeometer CGR3, the sensor is equipped with leveling bays, and the white sunshade prevents heating of the housing. The standard length of the cable is 10m and the contacts of the water-proof connector are gold-plated.

The Pyrgometer CGR3 does not require any power supply and is supplied with a certificate of calibration, which is traceable to the WISG (World Infrared Standard Group).

The CGR3 Pyrgeometer has a flat silicon window with a 150 ° field of view. Its small size and compact design make it ideal for horticulture and agriculture. A screwing-on mounting bracket is available as an option.

SGR3 Pyrgeometer

The SGR3 is a pyrgeometer, designed for meteorological measurements of downward atmospheric long wave radiation. The SGR3 uses a specially designed silicon window. On the inside a solar-blind filter blocks solar radiation. The SGR3 data represents the radiation exchange within the whole hemisphere. This is because the reference SGR3 is calibrated outdoors with respect to a reference CGR4, which has a 180 degrees field of view.

The SGR3 has Modbus® interface, amplified analogue output, improved response time and temperature corrected measurement data. The long wave net- and downward radiation are directly available over Modbus®. The wide and low power supply range from 5 to 30 VDC makes integration in meteorological and solar energy stations easy. The SGR3 is extremely robust and comes with 5 years warranty (*).

The base of the instruments contains the mounting holes, a spirit level and levelling feet for exact levelling. For ease of mounting, exchange and recalibration the instruments have a waterproof connector. The improved temperature dependency and directional response make these instruments the ideal choice for meteorological and agricultural applications.

Thanks to standardized output and connections of every SGR3, exchanging instruments for recalibration is easy.

SmartExplorer Windows™ software for data logging, display of data and Modbus® address setting is provided as standard.