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The PMA2145 is an ISO-classified first class pyranometer. It is based on the thermopile technology assuring very broad spectral sensitivity with exceptional flatness and very good long term stability. The PMA2145 features a sixty-four thermocouple junction sensing element. The sensing element is coated with a highly stable carbon based non-organic coating, which delivers excellent spectral absorption and long term stability characteristics. The sensing element is housed under two concentric fitting Schott K5 glass domes.