R02-TR pyrgeometer for longwave irradiance

IR02-TR Pyrgeometer with Heater

IR02-TR measures the longwave or far-infra-red radiation received by a plane surface, in W/m², from a field of view angle of approximately 150°. Longwave radiation is the part of radiation that is not emitted by the sun. The actual field of view angle of IR02-TR is not the ideal 180°. The reduction of this field of view makes it possible to offer an instrument at an attractive price level, while the accuracy loss is relatively small. IR02-TR has a window with a cut-on at 4.5 x 10⁻⁶ m, making it suitable for day- and night observations.

Operation

Using IR02-TR is easy. The pyrgeometer can be connected directly to commonly used data logging systems. The irradiance in W/m² is calculated by using the transmitter’s output and the temperature reading. The final result is calculated taking into account the irradiance radiated by the sensor itself (Stefan-Boltzmann law). In IR02-TR’s standard configuration, the 4 to 20 mA output corresponds to a transmitted range of -300 to +100 W/m² . This range can be adjusted at the factory upon request.

IR02-TR Design

IR02-TR pyrgeometer employs a thermal sensor with black coating, a flat silicon window with solar blind filter and an anodised aluminium body. IR02-TR houses an on-board heater. Heating prevents condensation of water on the pyrgeometer window which, when occurring, leads to very large measurement errors. IR02-TR has a high sensitivity. With the transmitter a typical datalogger no longer contributes to the uncertainty of the measurement

Suggested Use

Areas of Application