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Pyrgeometer MS-202 is designed to measure long-wave radiation beyond 3µm. A specially coated silicon dome transmits incident radiation of wavelength greater than 3µm by cutting off the shorter wavelengths. The radiative compensation circuit with a thermistor is integrated into pyrgeometer MS-202. This circuit is used for the sensor body temperature measurement. The infrared radiation is output as an analogue voltage, which is decided by compensating the incident radiation from the atmosphere or earth-ground with the radiation emitted from the heat of detector itself. The infrared radiation can be easily measured from only this analogue output. A thermistor dome temperature sensor is available as an option. Pt-100 temperature sensor for both the sensor body temperature and the dome temperature is also available as an option.