Using the SPN1 Pyranometer on NRG Symphonie Loggers
Symphonie loggers support several pyranometers using a choice of optional Signal Conditioning Modules (SCMs). The Delta-T SPN1 Thermopile based pyranometer provides signals for Global Horizontal Irradiance (GHI), Diffuse Irradiance (DIF) and Sunshine Duration (SUN). The GHI and DIF outputs are proportional to the solar radiation, measured in Watts per square meter (W/m2 ). The Sunshine Duration output is a switch, which closes when the WMO 120 Watt /m2 sunshine threshold has been met.
The NRG logger collects and stores data in raw format; a scale factor needs to be calculated to convert the raw data to engineering units. This application note explains which SCM and scale factor to use for the SPN1, and also how to connect the sensor to Symphonie.
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