The SL-610 is a downward-looking thermopile pyrgeometer. The sensor incorporates a filter, blackbody thermopile detector, and thermistor with a rugged, self-cleaning sensor housing design. Typical applications include longwave radiation measurement in agricultural, ecological, and hydrological weather networks and renewable energy applications. Sensor includes IP67 marine-grade stainless-steel cable connector 30 cm from head to simplify sensor removal and replacement for maintenance and recalibration.
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Sensitivity0.12 mV per W mˉ² (variable from sensor to sensor, typical value listed)Calibration Factor (Reciprocal of Sensitivity)8.5 W mˉ² per mV (variable from sensor to sensor, typical value listed)Calibration Uncertainty± 5 %Measurement Range-200 to 200 W mˉ² (net longwave irradiance)Measurement RepeatabilityLess than 1 %Long-term DriftLess than 2 % change in sensitivity per yearNon-linearityLess than 1 %Detector Response TimeLess than 0.5 secondsField of View150 ˚Spectral Range5 to 30 µmTemperature ResponseLess than 5 % from -15 to 45 CWindow Heating OffsetLess than 10 W mˉ²Zero Offset BLess than 5 W mˉ²Tilt ErrorLess than 0.5 %Uncertainty in Daily Total± 5 %Temperature Sensor30 kΩ thermistor, ± 1 C tolerance at 25 COutput from Thermistor0 to 2500 mV (typical, other voltages can be used)Input Voltage Requirement for Thermistor2500 mV excitation (typical, other voltages can be used)Heater780 Ω, 15.4 mA current draw and 185 mW power requirement at 12 V DCDimensions27.5 mm height, 23.5 mm diameterMass100 gWarranty4 years against defects in materials and workmanship