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How it works
The SP-Lite2 uses a silicon photodiode detector to generate a voltage output proportional to the solar radiation received by the sensor. Its diffuser provides a cosine-corrected response, helping the instrument measure radiation arriving from different angles across the sky.
Solar irradiance in watts per square meter is calculated by dividing the measured output voltage by the sensor’s individual calibration sensitivity.
SP-Lite2 Technical Specifications
Fast, reliable global solar irradiance measurement in a compact, weather-resistant sensor.
| Measurement | Global solar irradiance |
|---|---|
| Detector | Silicon photodiode |
| Spectral range | 400 to 1100 nm |
| Sensitivity | 60 to 100 µV/W/m² |
| Expected output | 0 to 150 mV at 0 to 1500 W/m² |
| Maximum operational irradiance | 2000 W/m² |
| Response time (95%) | < 500 ns |
| Non-linearity | < 1% from 0 to 1000 W/m² |
| Directional error | < 10 W/m² up to 80° with a 1000 W/m² beam |
| Temperature dependence | −0.15%/°C |
| Non-stability | < 2% change per year |
| Field of view | 180° |
| Operating temperature | −40 to 80°C (−40 to 176°F) |
| Humidity range | 0 to 100% non-condensing |
| Ingress protection | IP67 |
| Sensor impedance | Approximately 50 Ω |
| Recommended input impedance | > 1 MΩ |
| Bubble-level accuracy | < 0.2° |
| Standard cable | 5 m (16.4 ft) |
| Maximum cable length | 100 m (328 ft) |
| Weight | 0.11 kg (0.24 lb) |
Typical Applications
Designed for routine solar radiation measurements across environmental, energy, and research applications.
Solar Energy
Monitor available irradiance and evaluate photovoltaic system performance.
Weather Monitoring
Add global solar radiation data to automatic weather and meteorological stations.
Agriculture
Support crop research, evapotranspiration estimates, and irrigation decisions.
Hydrology
Measure the solar-energy input used in watershed and evaporation studies.
Building Automation
Use solar radiation as an input for energy management and automated controls.
Research & Education
A practical sensor for field experiments, demonstrations, and monitoring networks.