Description
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DR15 pyrheliometers are applied in high-accuracy measurements of the solar radiation received by a plane surface from a 5 ° full field of view angle. This quantity, expressed in W/m², is called “direct” solar radiation or DNI (direct normal irradiance). It is necessary to keep the instrument pointed at the sun by using a two-axis tracker. |
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The pyrheliometer features a precision ground and polished quartz window, a compact sized collimated tube and a thermopile sensor with black coated surface. DR15-A1 offers analogue output in millivolts. It can be connected directly to commonly used data logging systems. High data availability is attained by heating of the front window. This suppresses dew and frost deposition at a very low power consumption: DR15 needs only 1 W to keep its window free from dew and frost. |
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DR15 complies with the Class B specifications of the ISO 9060:2018 standard. Each DR15 pyrheliometer is supplied with test results for the individual instrument:
Each DR20 pyrheliometer also includes a test report on temperature response, as required by ISO 9060 for Class A classification. |
