Research grade normal incidence direct solar irradiance sensor (DNI), also known as pyrheliometer for short wave direct solar radiation. It complies with ‘First Class’ classification, from ISO9060 and WMO standards.
A unique product feature is the heated window, eliminating the formation of dew on the sensor window, making early morning measurements more accurate.
DPA259 is the first pyrheliometer to include a fast detector, making it ideal for high grade research or CPV applications..


  • Pyrheliometer instrument for measurement of direct beam solar irradiance so called “Direct radiation”
  • “First Class” classification according to ISO9060
  • Integrated anti-condensation heated optic
  • Fast response time
  • Mountable on solar trackers
  • μV output, RS485-RTU and 4…20 mA output using external modules