Pyrgeometers use silicon windows to transmit infrared radiation and these have an internal thin film coating that blocks short-wave solar radiation from reaching the broadband thermopile detector.
The CGR4 is a pyrgeometer, designed for top level solar radiation monitoring networks such as the Baseline Surface Radiation Network (BSRN) of the World Meteorological Organisation for the meteorological measurements of downward atmospheric longwave radiation. The CGR4 uses a thermopile detectors and has a sensitivity of 5 to 15V/W/m in a spectral range of 4.5 to 42m. This pyrgeometer has a specially designed silicon meniscus dome with a hard-carbon coating for a smooth spectral response and provide extra surface protection. An internal thin film coating that absorb a large part of the short-wave radiation. The unique design of the CGR4 reduces the dome heating offset to a negligible level (particularly when ventilated), eliminating the need for dome temperature measurements or...
The SGR4 is a Smart Pyrgeometer, designed to provide meteorological measurements of downward atmospheric long wave radiation. The construction of SGR4 pyrgeometers is identical to the CGR4 pyrgeometers but it includes a Modbus interface and amplified analogue output. The SGR4 uses a thermopile detector in a spectral range of 4.5 to 42m. This pyrgeometer has a specially designed silicon meniscus dome with a hard-carbon coating for a smooth spectral response and provide extra surface protection. An internal thin film coating that absorb a large part of the short-wave radiation. The unique design of the SGR4 reduces the dome heating offset to a negligible level (particularly when ventilated), eliminating the need for dome temperature measurements or dome shading. The SGR4's Modbus...
The CVF4 Ventilation unit is a low maintenance ventilation unit with a fan and inlet filter that provides a flow of clean air over the dome of a radiometer. The integrated heater allows the air to be warmed when necessary. The fan of the CVF4 runs continuously to reduce dust and dirt settling, to dissipate rain drops and to stabilise the dome temperature. A tacho output from the fan gives two pulses per revolution and allows remote monitoring of the fan operation using a data logger. The CVF4 is designed to be used with Kipp & Zonen CMP and SMP series pyranometers, the CGR 4 pyrgeometer, and the CUV5 total UV radiometer.
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