Apogee Instruments' new four-component net radiometer provides individual measurement of net radiation components. The sensor features an SDI-12 output, eliminating the need for multiple analog channels to measure the individual components of net radiation. The net radiometer comes as a complete package that includes net radiometer, mounting rod, pigtail lead cable for datalogger interface, and carrying case.
Onboard A/D Conversion and SDI-12 Output Apogee net radiometers feature onboard A/D conversion and SDI-12 output to eliminate the requirement of multiple analog datalogger channels.
Four-component Net Radiometer An upward-looking and downward-looking pyranometer, and an upward-looking and downward-looking pyrgeometer provide separate measurements of the four components of net radiation.
Individually Heated Radiometers Each radiometer includes an individual heater to increase accuracy by minimizing the influence of dew/frost on the filter.
Compact and Light Weight Designed to be light weight and small in size to facilitate easy mounting.
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SN-500SpecificationsInput Voltage Range5.5 to 16 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 mAResponse 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 DCOperating Environment-50 to 80 C; 0 to 100 % relative humidityDimensions116 mm length, 45 mm width, 66 mm heightMass320 g (with mounting rod and 5 m of lead wire)CableM8 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 wiresPyrgeometerSpecificationsSensitivity0.12 mV per W mˉ² (variable from sensor to sensor, typical value listed)Calibration Factor (Reciprocal of Sensitivity)8.5 W mˉ² (variable from sensor to sensor, typical value listed)Calibration Uncertainty± 5 %Output Ranges-24 to 24 mVMeasurement 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 sField 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)PyranometerSpecificationsSensitivity0.057 mV per W mˉ² (upward-looking); 0.15 mV per W mˉ² (downward-looking), (variable from sensor to sensor, typical values listed)Calibration Factor (Reciprocal of Sensitivity)17.5 W mˉ² per mV (upward-looking); 6.7 W mˉ² per mV (downward-looking)Calibration Uncertainty± 5 %Output Range0 to 114 mV (upward-looking); 0 to 300 mV (downward-looking)Measurement Range0 to 2000 W mˉ² (net shortwave irradiance)Measurement RepeatabilityLess than 1 %Long-term DriftLess than 2 % per yearNon-linearityLess than 1 %Detector Response Time0.5 sField of View180 ˚ (upward-looking); 150 ˚ (downward-looking)Spectral Range385 nm to 2105 nm (upward-looking); 295 nm to 2685 nm (downward-looking)Directional (Cosine) ResponseLess than 30 W mˉ² at 80 ˚ solar zenith (upward-looking); Less than 20 % for angles between 0 and 60 ˚ (downward-looking)Temperature ResponseLess than 5 % from -15 to 45 CZero Offset ALess than 5 W mˉ²; Less than 10 W mˉ² (heated)Zero Offset BLess than 5 W mˉ²Uncertainty in Daily TotalLess than 5 %