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Net Total Radiation Sensor

 

Product overview
The net total radiometer is used to measure the net difference between the full band radiation projected downward from the sky and upward from the earth's surface. The measurement range is 0.3 ~ 3 microns of short wave radiation and 3 ~ 50 microns of earth radiation. It is applied to the calculation of soil water evaporation and transpiration and the study of building mechanism related to heat balance.
Net radiation meter is widely used in agrometeorology, calculation of total loss of soil water evaporation and transpiration, prevention of crop disasters and Research on building mechanism related to heat balance.

Functional features
Passive measurement, small size and light weight;
Simple structure and easy to use;
Suitable for routine research and measurement;
Low cost and high cost performance.

working principle
The working principle of the net radiation meter is thermoelectric effect. The induction part is a thermopile composed of constantan wire copper plating. The thermopile is coated with imported high absorption matte black coating. The two thermopiles receive solar radiation and earth radiation respectively. Due to the different radiance absorbed by the upper and lower induction surfaces, there is a temperature difference at both ends of the thermopile, and its output electromotive force is directly proportional to the irradiance difference received by the induction surface.
The net radiation meter is equipped with a hemispherical polyethylene film cover that can pass through short wave radiation (0.3 ~ 3 microns) and long wave radiation (3 ~ 50 microns), so as to prevent the influence of wind and rain on the output of the radiation meter and protect the sensing surface. The output radiation (W / m2) = the measured output voltage signal value( μ 5) ÷ sensitivity coefficient( μ V / w • m-2), and each sensor gives the calibrated sensitivity coefficient respectively.

technical parameter
Power supply: 12V ~ 24V DC
Spectral range: 3 ~ 50 μ M (long wave radiation)
0.3~3 μ M (short wave radiation)
Signal range: - 300 ~ + 1000W / m2
Output signal:
Voltage type: - 20 ~ + 20mV, 0 ~ 2V
Current type: 4 ~ 20mA
RS485 type: MODBUS-RTU
Sensitivity: 1 ~ 14 μ V/Wm-2
Response time: ≤ 35S (99%)
Internal resistance: about 350 Ω
Annual stability: ≤± 2%
Consistency of sensing surface: ± 15%

Scope of application
It is widely used in solar photovoltaic power generation, agricultural and forestry ecological research, calculation of total loss of soil water evaporation and transpiration, prevention of crop disasters, research on building mechanism related to heat balance and other fields.

Net Total Radiation Sensor

Net Total Radiation Sensor

 

Net Total Radiation Sensor

 

Net Total Radiation Sensor

 

Net Total Radiation Sensor

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