Pyrgeometer IR02

Overview
The IR02 is a pyrgeometer designed for longwave irradiance measurements in meteorological, agricultural, and environmental monitoring applications. Equipped with an integrated heater, the IR02 minimizes measurement errors caused by dew and frost deposition while delivering reliable performance and high data availability in outdoor environments. Its cost-effective design provides an excellent balance between accuracy, durability, and affordability. The instrument provides a low-level voltage output for direct connection to high-resolution data acquisition systems.

Key features
• High sensitivity: With sufficient input signal, a typical data logger no longer significantly contributes to measurement uncertainty.
• On-board heater: Prevents condensation on the pyrgeometer dome, which can cause very large measurement errors.
• Suitable for both day and night measurements thanks to its solar-blind filter with a 4.5 µm cut-on wavelength.
• Analog millivolt output for easy integration with commonly used data acquisition systems.
• Calibration of pyrgeometers used for downward longwave radiation is traceable to the World Infrared Standard Group (WISG).

Applications
• Meteorological and climatological monitoring networks.
• Agricultural warning networks (frost)

Specifications
• Measurand: longwave radiation [W/m²]
• Optional measurands: sky temperature and surface temperature [°C]
• Spectral range: 4.5 to 42 × 10⁻⁶ m
• Field of view: 150°
• Response time (95%): 18 s
• Operating temperature range: -40 °C to +80 °C
• Temperature dependence: < ±3 % (-10 °C to +40 °C)
• Temperature sensor: Pt100
• Heater: 12 VDC, 1.5 W
• Standard cable length: 5 m

Cable length options
• 5 m
• Longer cable, in multiples of 5 m