240-SP Thermopile Pyranometer/Albedometer
The 240-SP-510 is an upward-looking thermopile pyranometer. The 240-SP-610 is a downward-looking thermopile pyranometer. The sensors can be coupled to form an albedometer.
The 240-SP-510-SS Upward-looking Thermopile Pyranometer has an analog output of 0 to 114 mV. The sensor incorporates a blackbody thermopile detector and acrylic diffuser with a rugged, self-cleaning sensor housing design.
The 240-SP-610-SS Downward-Looking Thermopile Pyranometer has an analog output range of 0 to 300 mV. The sensor incorporates a blackbody thermopile detector and flat glass window with a rugged housing design.
The Upward-looking and Downward-looking sensors can also be coupled to form an albedometer using the 240-AL-130 Albedometer Mounting Bracket.
Typical applications include shortwave radiation measurement in agricultural, ecological, and hydrological weather networks. Sensors are also used to optimize photovoltaic systems. Each sensor includes an IP68 marine-grade stainless-steel cable connector 30 cm from head to simplify sensor removal and replacement for maintenance and recalibration.
Specifications
240-SP-510-SS Upward-Looking Thermopile Pyranometer
- Power Supply: Self powered
- Sensitivity (variable from sensor to sensor, typical values listed): 0.057 mV/W/m²
- Calibration Factor (reciprocal of sensitivity) (variable from sensor to sensor, typical values listed): 17.5 W/m²/mV
- Calibration Uncertainty: ± 5%
- Calibrated Output Range: 0 to 114 mV
- Measurement Range 0 to 2000 W/m² (net shortwave irradiance)
- Measurement Repeatability: Less than 1%
- Long-term Drift: Less than 2% per year
- Non-linearity: Less than 1%
- Detector Response Time: 0.5 seconds
- Field of View: 180°
- Spectral Range (50% points): 385 nm to 2105 nm
- Directional (Cosine) Response: Less than 30 W/m² at 80° solar zenith
- Temperature Response: Less than 5% from -15 °C to 45 °C
- Zero Offset A: Less than 5 W/m², Less than 10 W/m² (heated)
- Zero Offset B: Less than 5 W/m²
- Operating Environment: -50 °C to 80 °C, 0 to 100% relative humidity
- Heater: 780 Ω, 15.4 mA current drain and 185 mW power requirement at 12 Vdc
- Uncertainty in Daily Total: Less than 5%
- Dimensions: 28.7 mm height, 23.5 mm diameter
- Mass: 90 g
- Cable: 5 meters of 4-conductor, shielded, twisted-pair wire; additional cable available in multiples of 5 meters; TPR jacket (high water resistance, high UV stability, flexibility in cold conditions); pigtail lead wires
240-SP-610-SS Downward-Looking Thermopile Pyranometer
- Sensitivity (variable from sensor to sensor, typical values listed): 0.15 mV/W/m²
- Calibration Factor (reciprocal of sensitivity) (variable from sensor to sensor, typical values listed): 6.7 W/m²/mV
- Calibration Uncertainty: ± 5%
- Calibrated Output Range: 0 to 300 mV
- Measurement Range: 0 to 2000 W/m² (net shortwave irradiance)
- Measurement Repeatability: Less than 1%
- Long-term Drift: Less than 2% per year
- Non-linearity: Less than 1%
- Detector Response Time: 0.5 seconds
- Field of View: 150°
- Spectral Range (50% points): 295 to 2685 nm
- Directional (Cosine) Response: Less than 20% for angles between 0 and 60°
- Temperature Response: Less than 5% from -15 °C to 45 °C
- Zero Offset A: Less than 5 W/m², Less than 10 W/m² (heated)
- Zero Offset B: Less than 5 W/m²
- Uncertainty in Daily Total: Less than 5%
- Operating Environment: -50 °C to 80 °C, 0 to 100% relative humidity
- Heater: 780 Ω, 15.4 mA current drain and 185 mW power requirement at 12 Vdc
- Dimensions: 28.7 mm height, 23.5 mm diameter
- Mass: 100 g
- Cable: 5 meters of 4-conductor, shielded, twisted-pair wire; additional cable available in multiples of 5 meters; TPR jacket (high water resistance, high UV stability, flexibility in cold conditions); pigtail lead wires
