Pyrgeometer IR02-TR

Overview
The IR02-TR is a pyrgeometer designed for longwave irradiance measurements in meteorological, agricultural, and environmental monitoring applications. Equipped with an integrated heater, the IR02-TR 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 IR02-TR houses a 4–20 mA transmitter for easy read-out by commonly used data loggers.

Key features
• 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 4-20 mA 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]
• Output: 4-20 mA
• 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