- Measures global (total) and diffuse irradiance in W/m²
- WMO sunshine threshold: 120 W/m² direct beam
- No routine adjustment or polar alignment
- No moving parts, shade rings or motorised tracking
- Works at any latitude
- Unique ground glass dome
- Wideband thermopile sensors
- Near ideal spectral and cosine response
- Standard output sensitivity
- Matches or exceeds the ISO Class B standard and the WMO Good Quality standard for a solar pyranometer in all respects apart from the spectral response – which is accurate to ±10% over 0.4 to 2.7 μm
| Characteristic | Description / Value |
|---|---|
| Spectral range | 0 to > 2000 W/m² |
| Resolution | 0.6 W/m² = 0.6mV |
| Analog output sensitivity | 1mV = 1 W/m² |
| Analog output range | 0 … 2500 mV |
| Sunshine status threshold | 120 W/m² |
| Sunshine status output | No sun = open circuit Sun = short circuit to ground |
| Accuracy: sunshine status | ± 10% sun hours with respect to the threshold |
| Accuracy: cosine correction | ± 2% of incoming radiation over 0 … 90° zenith angle |
| Accuracy: azimuth angle | ± 5% over 360° rotation |
| Quality Standard | SPN1 matches or exceeds ISO First Class standard and WMO Good Quality standard for solar pyranometers in all respects apart from spectral response – which is accurate to ±10% over 0.4 to 2.7 μm |
| Overall Acuracy | ± 5% daily integrals |
| Global (Total) | ± 5% ± 10 W/m2 hourly averages |
| Diffuse Radiation | ± 8% ± 10 W/m² individual readings Accuracy figures give 95% confidence limits, i.e. 95% of individual readings will be within stated limits under normal climactic conditions. |
| Power requirements | 2 mA (excluding heating power) 5 … 15 VDC |
| Heating power | 12 … 15 VDC, up to 1.5 A |
| Heating control | Continuously variable up to 20 W output for external temperatures below 0°C |
| Lowest snow & ice-free temperatures (with heating in use) |
-20°C at 0 m/s wind speed -10°C at 2 m/s wind speed |
| Temp coefficient | ± 0.02% per °C typical (-20 … +70°C) |
| Temperature range | -40 … +70°C |
| Recalibration / stability | Factory calibration recommended every 2 years |
| Spectral response | 400 … 2700 nm |
| Spectral sensitivity variation | 10% typical |
| Latitude capability | -90 … +90°C |
| Connection | 8-pole plug (M12) |
| Cable | 8-wire cable, length: 5 m |
| Environmental | IP67 sealing |
| Mounting options | 3 x M5 tapped holes in base; 108 mm pcd, 120° spacing |
| Size / weight | 140 mm (diameter) x 100 mm (height), 940g |
| Manufacturer | Delta-T Devices Ltd. |
