The SPN1 Sunshine Pyranometer is a meteorological-class instrument that simultaneously measures Global (Total) and Diffuse solar radiation and calculates Sunshine Duration. Its patented design, featuring seven thermopile sensors and a computer-generated shading pattern, requires no moving parts, shade rings, or polar alignment. With a built-in heater to prevent frost, snow, and dew, the SPN1 provides reliable, maintenance-free operation in all climates and at any latitude, offering an affordable alternative to complex traditional setups.
All-in-One Solar Radiation Measurement
The SPN1 Sunshine Pyranometer represents a significant innovation in environmental monitoring, consolidating the functions of multiple instruments into one robust, reliable device. By employing a unique array of seven thermopile sensors and a fixed shading pattern, it accurately determines the direct and diffuse components of solar radiation without the need for costly solar tracking systems or manual adjustments. This sophisticated design ensures that regardless of the sun's position, the instrument provides precise data, making it exceptionally easy to deploy for long-term, unattended monitoring campaigns.
Engineered for Reliability and Accuracy
Housed in a durable casing with a precision ground glass dome, the SPN1 delivers near-ideal spectral and cosine response across a wide range of conditions. Its integrated heater automatically activates to keep the dome clear of condensation, ice, and snow in temperatures as low as -20°C, guaranteeing data integrity and continuity through challenging weather. The SPN1 outputs analog signals for Global and Diffuse radiation and a digital signal for sunshine status, making it compatible with most data loggers for seamless integration into any monitoring network.
Key Advantages and Benefits
- Triple Measurement: Single instrument measures Global radiation, Diffuse radiation, and Sunshine Duration.
- No Moving Parts & No Alignment: Patented fixed shading design eliminates the need for tracking or routine adjustment, working at any latitude.
- Built-In Heater: Ensures operation and accurate readings in adverse conditions by preventing ice and snow accumulation.
- High Accuracy: Provides meteorological-class data with excellent spectral and cosine response.
- Low Maintenance: Designed for long-term, reliable deployment with minimal upkeep.
Typical Applications and Usage
The SPN1 is the ideal choice for a vast range of applications where precise solar data is critical:
- Meteorology & Climatology: For weather stations, climate change research, and air pollution studies.
- Agricultural Science: Essential for evapotranspiration (ET) models, crop growth analysis, and irrigation management.
- Renewable Energy: Monitoring photovoltaic (PV) system efficiency and conducting energy balance studies.
- Building Design: Informing Building Management Systems (BMS) and architectural design with accurate solar load data.
| Parameter | Specification |
|---|---|
| Measured Parameters | Global (Total) Horizontal Irradiance, Diffuse Horizontal Irradiance, Sunshine Duration |
| Overall Accuracy (Daily integrals) | ±5% for Global and Diffuse |
| Overall Accuracy (Hourly averages) | ±8% ±10 W.m⁻² for Global and Diffuse |
| Range | 0 to > 2000 W.m⁻² |
| Output Sensitivity & Range | 1 mV = 1 W.m⁻²; 0 - 2500 mV analogue output for Global and Diffuse |
| Sunshine Threshold | 120 W.m⁻² in the direct beam (WMO standard) |
| Sunshine Status Accuracy | ±10% of sun hours with respect to threshold |
| Cosine Correction | ±2% of incoming radiation (0-90° Zenith angle) |
| Spectral Response | 400 to 2700 nm |
| Response Time | < 200 ms |
| Operating Temperature | -40°C to +70°C (with heater active below 0°C) |
| Heater Power | 12-15 V DC, up to 1.5 A (continuously variable) |
| Instrument Power | 5-15 V DC, 2 mA (excluding heater) |
| Environmental Rating | IP67 |
| Dimensions & Weight | 140 mm diameter x 100 mm (height); 940 g |
| Brand | Delta-T |
