With the thermopile CA2 radiant fluxes can be measured. It is sensitive to radiation from 0.2 to 50 µm, and has a total field of view of 20 º. The field of view is determined by cylindrical brass housing, that contains a conical reflector and a removable glass window.
The CA2 contains a thermopile detector that has a spectrally non-selective black coating. Therefore, the detector responds to the total power absorbed.
The thermopile outputs voltage in proportion to the radiation received.
The thermopile also comes with calibration certificate.