Global (Total) and Diffuse irradiance in W.m-2
WMO sunshine threshold: 120 W.m-2 direct beam
DNI (Direct Normal Irradiance) calculations
Sunshine status
No moving parts, shade rings or motorised tracking
The SPN1 Sunshine Pyranometer is a precision solar radiation measurement instrument with a ground glass dome, and is designed for long-term outdoor exposure. It is an affordable and effective alternative to shade-ring pyranometers, pyrheliometers and traditional sunshine recorders.
The SPN1 Pyranometer is exceptionally easy to use; it needs no routine adjustment or polar alignment and works at any latitude.
An internal heater keeps the pyranometer dome clear of dew, ice and snow down to -20°C (in still air conditions), ensuring reliable readings in difficult climatic conditions. The pyranometer design is protected by patents EP 1012633 and US 6417500.
SPN1 Pyranometer Resource Centre
The Resource Centre contains a wide range of application and technical information for the SPN1 Pyranometer – covering DNI calculation, tilt correction, performance validation, and much more. Visit the SPN1 Resource Centre.
Direct and Diffuse Radiation
The Pyranometer uses an array of seven miniature thermopile sensors and a computer-generated shading pattern to measure the direct and diffuse components of incident solar radiation. It computes direct radiation by subtracting the diffuse from the global (total) radiation.