SN-500-SS Net Radiometer

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.

Specification

• Input voltage range: 5.5 to 24 V DC (heaters are optimized to operate at 12 V DC)
• Current consumption (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 (individually heated sensors): 62 mA current consumption and 740 mW power requirement at 12 V DC
• Operating environment: -50 to 80 C; Relative humidity 0 to 100% Dimensions: 116 mm long, 45 mm wide, 66 mm high
• Mass: 320 g (with mounting rod and 5 m lead wire)
• Cable: M8 connector (IP68 rated) for interfacing with sensor housing, 5 m four-conductor shielded twisted pair cable in a Santoprene rubber sheath with spiral lead wires
• Manufacture: Made in the USA
• Pyrgeometer: Specifications
• Pyrgeometer Sensitivity: 0.12 mV per W mˉ² (variable from sensor to sensor, typical value indicated)
• Pyrgeometer Calibration Factor (reciprocal of sensitivity): 8.5 W mˉ² (variable from sensor to sensor, typical value indicated)
• 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 Error: Less than 5 % from -15 to 45 C Pyrgeometer Tilt: Less than 0.5%
• Pyrgeometer Uncertainty on Daily Total: ±5%
• Pyrgeometer Temperature Sensor: 30kΩ Thermistor, ±1C Tolerance at 25C
• Pyrgeometer Output from Thermistor: 0 to 2500mV (typical, other voltages may be used)
• Pyrgeometer Input Voltage Requirement for Thermistor: 2500mV Excitation (typical, other voltages may be used)
• Pyranometer: Specifications
• Pyrgeometer Sensitivity: 0.045mV per W mˉ² (up); 0.035 mV per W mˉ² (down), (variable from sensor to sensor, typical values ​​listed)
• Pyranometer Calibration Factor (reciprocal of sensitivity): 22 W mˉ² per mV (up); 28.5 W mˉ² per mV (looking down) Pyranometer Calibration Uncertainty: Less than 3% at 1000 W mˉ² Pyranometer Output Range: 0 to 90 mV (looking up); 0 to 70 mV (looking down)
• 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 ˚ (looking up); 150 ˚ (looking down)
• Pyranometer spectral range: 385 nm to 2105 nm (looking up); 295 nm to 2685 nm (looking down)
• Pyranometer directional (cosine) response: Less than 30 W mˉ² at 80 ˚ solar zenith (looking up); less than 20% for angles between 0 and 60˚ (looking down)
• Pyranometer temperature response: less than 5% from -15 to 45°C Pyranometer A zero offset: less than 5 W mˉ²; less than 10 W mˉ² (heated)
• Pyranometer B zero offset: less than 5 W mˉ²
• Pyranometer uncertainty in daily total: less than 5%