Sunshine Pyrometer

We specialize in offering a wide array of Sunshine Pyrometer that is a meteorological class instrument and has built-in heater, designed for long-term outdoor exposure. We have developed it as an affordable alternative to shade-ring pyrometers, potentiometers and traditional sunshine recorders. Further, this system is easy to use and requires no routine adjustment or polar alignment and can work at any latitude. It is effectively integrated with an internal heater, which keeps the dome clear of dew, ice and snow down to -20° C (in still air conditions), thereby assuring reliable readings in the most toughest climatic conditions.


Specifications :


  • Global (Total) and Diffuse irradiation in W.m-2
  • WMO sunshine threshold: 120 W.m-2 direct beam
  • No moving parts, shade rings or motorized tracking
  • protected by patents EP 1012633 and US 6417500
  • No routine adjustment or polar alignment
  • Works at any latitude
  • Precision ground glass dome


Direct and Diffuse Radiation:


  • To accurately measure the direct and diffuse components of incident solar radiation, it uses a range of seven miniature thermopile sensors and a computer-generated shading pattern
  • Besides, it can compute direct radiation by subtracting the diffuse from the global (total) radiation


Sunshine Duration:


  • The WMO threshold for bright sunshine is 120 W.m-2 in a plane perpendicular to the direct solar beam
  • The SPN1 uses an algorithm based on the ratio of direct to diffuse radiation
  • It is combined with the absolute values to effectively estimate sunshine duration within a few percent of the WMO standard
  • Requires neither adjustment or reposition to track the sun, which is a distinct advantage over devices with shadow rings
  • No complex electro-mechanical assemblies and no burnt paper tracks to interpret


Outputs and Logging:


  • It provides 2 analogue voltage outputs for global and diffuse radiation
  • A digital output for sunshine duration can be effectively connected to data loggers like Delta-T DL2e and GP1
  • Accurate readings can also be obtained directly from the RS-232 port


Following are its application areas:


  • Air pollution studies
  • Cloud cover research
  • ET and heat flux studies
  • Canopy analysis
  • Building energy management systems
  • PV (photo-voltaic) efficiency monitoring