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R02-TR pyrgeometer for longwave irradiance

Updated:2025-03-13

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  • Brand: Hukseflux
  • Model:IR02-TR
  • Description: R02-TR is a pyrgeometer suitable for longwave irradiance measurement in meteorological applications. The instrument can be heated, which improves measurement accuracy as it prevents dew deposition on
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Product Details

R02-TR pyrgeometer for longwave irradiance : User's Manual Datasheet

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?? 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

  • General meteorological observations
  • Climatological networks
  • Agricultural warning networks (frost)
  • Areas of Application

  • Meteorology / surface energy flux measurement
  • R02-TR pyrgeometer for longwave irradiance Specifications:

    Measurand longwave radiation
    Optional measurands – sky temperature
    – surface temperature
    Spectral range 4.5 to 40 x 10?? m
    Field of view angle 150 °
    Response time (95%) 18 s
    Rated operating temperature range -40 to +80 °C
    Transmitted range -300 to 100 W/m2
    Temperature dependence < ± 3 % (-10 to +40 °C)
    Calibration traceability to WISG
    Optional traceability to blackbody (ITS-90)
    Heater 12 VDC, 1.5 W
    Temperature sensor Pt100
    Standard cable length 5 m (see options)
    Options ? Longer cable, in multiples of 5 metres
    ? Blackbody calibration (ITS-90)
    ? Adapted transmitted range
    ? IR02 version without transmitter

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