A pyrheliometer is a device used to quantify the direct sunbeam of solar insolation. Pyrheliometers positioned on the Earth’s surface measure the solar irradiance after it penetrates the atmosphere. In other words, it is used to measure total hemispherical radiation (beam plus diffuse on a horizontal surface). A pyrheliometer, such as the CHP1-L, has a window through which sunlight enters. Pyranometer Working and Construction. Using the thermoelectric effect, the thermopile acts as a large thermocouple that measures the temperature of a particular body—in this case, the sun. PYRHELIOMETER AND PYRANOMETER PYRHELIOMETER A special type of pyrheliometer is used to measure direct solar flux at normal incidence. A thermopile consists of thermocouples, which are connected in series. And with this, we can conclude the working of the Pyrheliometer. Sunlight enters the instrument through a window and is directed onto a thermopile which converts heat to an electrical signal that can be recorded. We will know about the working of pyranometer and pyrheliometer. The sunlight, or incident solar short-wave radiation, is directed onto an electronic device called a thermopile. (PJLA) to perform pyranometer and pyrheliometer calibrations in accordance with the requirements of ISO/IEC17025, which are relevant to calibration and testing. EKO is a unique manufacturer who can offer calibration service for pyranometers and pyrheliometers in-house. The signal voltage is converted via a formula to measure watts per square metre. All pyranometers comply to the latest ISO9060:2018. SPN1 Pyranometer (a) and two-axis tracked CHP1 pyrheliometer (b) on the roof top of SPF in Rapperswil, Switzerland. Measurement of Solar Radiation It is important to measure solar radiation, owing to the increasing number of solar heating and cooling applications, and the necessity for accurate solar radiation data to predict performance. Eppley introduced their pyranometer in 1930, and the Model 50 was used by the US National Weather Service in their solar radiation network from 1951 to 1975. Pyranometer is a device that can be used to measure both beam radiation and diffuse radiation. This instrument faces the sun and follows its motion. It is a thermopile solar radiation detector with 50 thermojunctions in contact with black and white concentric rings. A pyrheliometer is an instrument for measurement of direct beam solar irradiance. Sunrays enter the windowpanes and are oriented onto an instrument called a thermopile. A new generation to assure revolutionary new standard and lowest measurements uncertainty. Professor L. Gorczynski of the Polish Meteorological Institute decided to construct a pyrheliometer and a pyranometer using modified Moll-Gorczynski thermopiles. Pyranometer is used to measure total hemispherical solar radiation. Pyrometer measures temperature by radiation principle. 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