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Help CenterTBL-1 Longwave Radiation Sensor
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1. Product Overview
The TBL-1 Longwave Radiation Sensor (also known as a terrestrial radiation pyrgeometer) is designed to measure hemispherical incoming or outgoing longwave radiation from the sky and the Earth’s surface in the 3.5–50 μm infrared band. It outputs a voltage signal proportional to longwave irradiance.
A silicon hemispherical dome is mounted above the sensor to block shortwave radiation, while the inner surface of the hemisphere is coated with a high-transmittance vacuum-deposited filter (average transmittance > 40%). The TBL-1 complies with WMO (World Meteorological Organization) standards for longwave radiation measurements.
The sensor housing is made of cast brass with an anti-static electrostatic spray coating, ensuring excellent corrosion resistance and suitability for long-term outdoor use. It offers high sensitivity, stable performance, maintenance-free operation, and easy installation, making it widely applicable in meteorology, climate research, solar energy, agriculture, and environmental studies.
2. Working Principle
The TBL-1 uses a multi-junction thermopile as its sensing element, coated with a high-absorptivity black layer. The hot junction is located on the sensing surface, while the cold junction is inside the instrument housing, generating a temperature difference proportional to longwave radiation intensity within the operating range.
To minimize the influence of ambient temperature, the sensor includes an internal temperature compensation circuit, and the optical dome is made of precision-ground quartz glass with a double-layer hemispherical structure, significantly reducing infrared interference.
The instrument features a desiccant cartridge inside the housing to prevent moisture condensation, ensuring long-term measurement stability.
3. Key Features
Zero power consumption (passive operation)
Built-in temperature compensation, minimizing environmental impact
IP67 protection, suitable for long-term outdoor deployment
Multiple output options to support various data acquisition systems
High performance-to-cost ratio and stable long-term reliability
High accuracy and fast response time
4. Technical Specifications
| Parameter | Specification |
|---|---|
| Response Time | ≤ 20 s |
| Internal Resistance | ~180 Ω |
| Nonlinearity | ≤ ±2% |
| Spectral Range | 3500–50000 nm |
| Temperature Dependence | ±2% (-20°C to +40°C) |
| Weight | 1.5 kg |
| Measurement Range | 0–2000 W/m² |
| Annual Stability | ±2% |
| Nonlinearity Error | <±2% |
| Temperature Sensor | PT100 |
| Operating Temperature | -40°C to +80°C |
| Operating Humidity | 0–100% RH |
| Output Signal | 0–20 mV or 4–20 mA / RS485 (with transmitter) |
| Power Supply | Passive (no external power required) |
5. Solar Radiation Observation Site
The manufacturer operates a 1,500 m² standard solar radiation observation field, featuring flat terrain, open sky, and no obstructions from buildings or human activity. This site fully meets ground-based radiometer calibration and testing requirements, ensuring the accuracy and reliability of sensor performance.
6. Typical Applications
Atmospheric radiation balance studies
Solar thermal systems and solar engineering
Building energy performance analysis
Environmental and climate research
Agricultural and ecological studies
Glaciology and polar climate research
7. Application Cases：
8. About Company
Need more information? Feel free to leave a message or contact us.
Sales Manager: Xie Meng
Email: xiemenghit@gmail.com
Whats app: +1(416)8260959
Website: www.sunweather.ca
TikTok: sunshine.met.tech
QQ: 619243274
WeChat: 619243274
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