IR20 & IR20WS PYRGEOMETER

Product catalog summary

Introduction
The IR20 pyrgeometer measures longwave or far-infrared radiation received by a plane surface, expressed in W/m². It is used in meteorology to measure downward and upward longwave irradiance. The IR20 features a dome with a solar blind filter, making it suitable for both day and night observations. The IR20WS model offers a wider spectral range and superior accuracy during nighttime.

Specifications
- Measurand: Longwave radiation
- Optional Measurands: Sky and surface temperature
- Spectral Range: IR20 (4.5 to 40 x 10^-6 m), IR20WS (1.0 to 50 x 10^-6 m)
- Field of View Angle: 180°
- Response Time: 3 seconds
- Sensitivity: 17 x 10^-6 V/(W/m²)
- Operating Temperature: -40 to +80 °C
- Calibration Traceability: WISG, optional blackbody (ITS-90)
- Temperature Sensor: 10 kΩ thermistor
- Heater: 12 VDC, 1.5 W
- Standard Cable Length: 5 m

Design & Benefits
The IR20 and IR20WS pyrgeometers offer breakthrough pricing due to technological innovations. They feature high sensitivity, low thermal resistance, and fast response time, making them suitable for moving platforms. The on-board heater prevents condensation, reducing measurement errors.

Options
- Longer cable options
- Blackbody calibration (ITS-90)

Suggested Use
- Climatological networks
- Extreme climates (polar/tropical)
- Moving platforms (aircraft, buoys)
- Uncertainty assessment
- Calibration reference

About Hukseflux
Founded in 1993, Hukseflux Thermal Sensors specializes in thermal measurement, offering a range of sensors and systems for heat flux, solar radiation, and thermal conductivity. They provide consultancy and services globally through offices in the Netherlands, USA, China, and Japan.

Catalog excerpts

Thermal Sensors IR20 & IR20WS Research grade pyrgeometers IR20 is a research grade pyrgeometer suitable for high-accuracy longwave irradiance measurement in meteorological applications. Thanks to Hukseflux’ technological innovation, IR20 is offered at a significantly lower price level than competing models of the same performance level. IR20 is capable of measuring during both day and night. In absence of solar radiation, model IR20WS offers even better accuracy because of its wider spectral range. Figure 2 overview of IR20 pyrgeometer: (1) cable, (2) fixation of sun screen, (3) dome with solar blind filter, (4) sun screen, (5) humidity indicator, (6) desiccant holder, (7) levelling feet, (8) bubble level, (9) connector IR20 measures the longwave or far-infra-red radiation received by a plane surface, in W/m2, from a 180° field of view angle. In meteorological terms pyrgeometers are used to measure “downward and upward longwave irradiance” (WMO definition). Longwave radiation is the part of radiation that is not emitted by the sun. The spectral range of longwave radiation is not standardised. A practical cut-on is in the range of 4 to 5 x 10-6 m. IR20 has a dome with a solar blind filter with a cut-on at 4.5 x 10-6 m, making it suitable for day- and night observations. Model IR20WS has a wide spectral range with a cut-on at 1.0 x 10-6 m. It offers a superior accuracy during night-time, when solar radiation is absent. Copyright by Hukseflux. Version 1301. We reserve the right to change specifications without prior notice Page 1/2. For Hukseflux Thermal Sensors go to www.hukseflux.com or e-mail us: [email protected]

Open the catalog to page 1

Thermal Sensors IR20 & IR20WS specifications Measurand Optional measurand Optional measurand Spectral range IR20 Spectral range IR20WS IR20WS restrictions for use Field of view angle Response time (95 %) Sensitivity (nominal) Rated operating temperature range Temperature dependence Calibration traceability Optional traceability Temperature sensor Heater Standard cable length longwave radiation sky temperature surface temperature 4.5* to 40 x 10-6 m 1.0 to 50 x 10-6 m only in the absence of solar radiation 180° 3s 17 x 10-6 V/(W/m2) -40 to +80 oC < ± 0.4 % (-30 to +50 °C) to WISG to blackbody...

Open the catalog to page 2