ZDFD long wave radiometer, also known as earth radiometer, is mainly used to measure the wavelength range of 4~50 from the atmosphere and the earth surface μ M infrared radiation, the instrument has high accuracy and good stability.
The Pyrgeometer consists of silicon arc light filter, sensing element (thermopile), thermistor, meter body, light shield, desiccant window and other components.
The sensing element is composed of a fast response wire wound electroplated multi node thermopile. The sensing surface is coated with an imported high absorption matt black coating to absorb radiant energy. The heat generated passes through the thermal resistance to change the temperature of the thermopile and convert it into a voltage signal.
|Power-In||No Power in|
|Interface||-20-0mV / RS485|
|Sensitivity||2~10 μ V/(W/m2)|
|Response Time||≤ 30s (99% response)|
|Nonlinear||≤± 2% (- 250~+250 W/m2)|
|Temperature Coefficient||≤± 1% (- 20~50 ℃)|
|Annual Stability||≤± 2%|
|Operating Temperature||- 40 ℃~+80 ℃|
Why double glass cover design？
The double glass cover is used to reduce the influence of air convection on the radiometer. The inner cover is designed to cut off the infrared radiation of the outer cover itself.