Dragino WSS-26, global radiation sensor 300 to 3000 nm, RS485

The Dragino WSS-26 measures total solar radiation (global radiation) in the spectral range of 0.3 to 3 µm, covering nearly the entire solar spectrum from UV through visible to infrared. When oriented downwards, the sensor measures reflected radiation, and with an additional shading ring, diffuse radiation can be determined. A high-precision light-sensitive element under a precision-engineered radiation cover ensures stable measurements, with connectivity provided via RS485 to the Dragino WSC2-L weather station.

Main features:

• Measurement of global radiation in W/m² in the spectral range 300 to 3000 nm, measurement range 0 to 2000 W/m²
• Flexible mounting: upward for global radiation, downward for reflected radiation, with a shading ring for diffuse radiation
• RS485 interface with Modbus command set, operable directly on the WSC2-L main unit (standard baud rate 4800)
• Calibration of multiple sensors via a Modbus-adjustable scaling factor (K-value)
• Wide supply voltage range of 5 to 24 V DC, operation from -40 °C to +70 °C

Specifications:

• Supply voltage: 5 to 24 V DC
• Interface: RS485
• Standard baud rate (with WSC2-L): 4800
• Spectral range: 0.3 to 3 µm (300 to 3000 nm)
• Measurement range: 0 to 2000 W/m²
• Resolution: 0.1 W/m²
• Accuracy: ±3 %
• Long-term stability: ≤ ±2 % per year
• Cosine error: ≤ 7 % at 10° solar elevation
• Temperature effect: ±2 % (-10 °C to +40 °C)
• Power consumption: 4 mA at 12 V
• Operating temperature: -40 °C to +70 °C
• Operating humidity: 10 to 90 % RH
• Dimensions: 15 × 11 × 6 cm
• Weight: 346.5 g
• Scope of delivery: 1 × WSS-26

Application areas:

• Agricultural weather stations based on the Dragino WSC2-L, e.g., as an input variable for calculating evapotranspiration and irrigation planning
• Irradiance monitoring at photovoltaic systems as a reference for comparison with actual yield
• Albedo measurements by combining an upward- and a downward-facing sensor
• Building automation and climate research, e.g., for controlling shading or recording local radiation balances

Documents:

• User Manual