Updated:2023-06-02
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Apogee Instruments' new four-component net radiometer provides individual measurement of net radiation components. The sensor features a Modbus RS-232 or RS-485 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.
Apogee net radiometers feature onboard A/D conversion and Modbus output to eliminate the requirement of multiple analog datalogger channels.
Four-component Net RadiometerAn 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 RadiometersEach radiometer includes an individual heater to increase accuracy by minimizing the influence of dew/frost on the filter.
Compact and Light WeightDesigned to be light weight and small in size to facilitate easy mounting.
Input Voltage Range | 5.5 to 24 V DC (heaters are optimized to run at 12 V DC) |
Output | RS-232 or RS-485 |
Current Draw (12 V DC Supply Voltage) | Heaters on: 72 mA; Heaters off: 13.5 mA |
Response Time | It takes 750 ms to digitize all detector signals |
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 % |
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