Input Voltage Range 5.5 to 24 V DC (heaters are optimized to run at 12 V DC) Current Draw (12 V DC Supply Voltage) Heaters on, communication enabled: 63 mA; Heaters off, communication enabled: 1.5 mA; Heaters off, communication disabled: 0.6 mA Response Time (using SDI-12 Protocol) 1 s (SDI-12 data transfer rate; detector response times are 0.5 s) Heaters (sensors individually heated) 62 mA current drain and 740 mW power requirement at 12 V DC Operating Environment -50 to 80 C; 0 to 100 % relative humidity Dimensions 116 mm length, 45 mm width, 66 mm height Mass 320 g (with mounting rod and 5 m of lead wire) Cable M8 connector (IP68 rating) to interface to sensor housing, 5 m of four conductor shielded, twisted-pair wire in a santoprene rubber jacket with pigtail lead wires Manufactured Made in the USA Pyrgeometer Specifications Pyrgeometer Sensitivity 0.12 mV per W mˉ² (variable from sensor to sensor, typical value listed) Pyrgeometer Calibration Factor (Reciprocal of Sensitivity) 8.5 W mˉ² (variable from sensor to sensor, typical value listed) Pyrgeometer Calibration Uncertainty ± 5 % Pyrgeometer Output Ranges -24 to 24 mV Pyrgeometer Measurement Range -200 to 200 W mˉ² (net longwave irradiance) Pyrgeometer Measurement Repeatability Less than 1 % Pyrgeometer Long-term Drift Less than 2 % change in sensitivity per year Pyrgeometer Non-linearity Less than 1 % Pyrgeometer Detector Response Time Less than 0.5 s Pyrgeometer Field of View 150 ˚ Pyrgeometer Spectral Range 5 to 30 µm Pyrgeometer Temperature Response Less than 5 % from -15 to 45 C Pyrgeometer Window Heating Offset Less than 10 W mˉ² Pyrgeometer Zero Offset B Less than 5 W mˉ² Pyrgeometer Tilt Error Less than 0.5 % Pyrgeometer Uncertainty in Daily Total ± 5 % Pyrgeometer Temperature Sensor 30 kΩ thermistor, ± 1 C tolerance at 25 C Pyrgeometer Output from Thermistor 0 to 2500 mV (typical, other voltages can be used) Pyrgeometer Input Voltage Requirement for Thermistor 2500 mV excitation (typical, other voltages can be used) Pyranometer Specifications Pyranometer Sensitivity 0.045 mV per W mˉ² (upward-looking); 0.035 mV per W mˉ² (downward-looking), (variable from sensor to sensor, typical values listed) Pyranometer Calibration Factor (Reciprocal of Sensitivity) 22 W mˉ² per mV (upward-looking); 28.5 W mˉ² per mV (downward-looking) Pyranometer Calibration Uncertainty Less than 3 % at 1000 W mˉ² Pyranometer Output Range 0 to 90 mV (upward-looking); 0 to 70 mV (downward-looking) Pyranometer Measurement Range 0 to 2000 W mˉ² (net shortwave irradiance) Pyranometer Measurement Repeatability Less than 1 % Pyranometer Long-term Drift Less than 2 % per year Pyranometer Non-linearity Less than 1 % Pyranometer Detector Response Time 0.5 s Pyranometer Field of View 180 ˚ (upward-looking); 150 ˚ (downward-looking) Pyranometer Spectral Range 385 nm to 2105 nm (upward-looking); 295 nm to 2685 nm (downward-looking) Pyranometer Directional (Cosine) Response Less than 30 W mˉ² at 80 ˚ solar zenith (upward-looking); Less than 20 % for angles between 0 and 60 ˚ (downward-looking) Pyranometer Temperature Response Less than 5 % from -15 to 45 C Pyranometer Zero Offset A Less than 5 W mˉ²; Less than 10 W mˉ² (heated) Pyranometer Zero Offset B Less than 5 W mˉ² Pyranometer Uncertainty in Daily Total Less than 5 %