CS320 Digital Thermopile Pyranometer

The CS320 is a digital thermopile pyranometer that measures broad-spectrum short-wave radiation and communicates over the simple SDI-12 protocol to the datalogger.

This sensor design eliminates measurement error and programming errors that can adversely affect data quality.

This pyranometer has been designed to improve the global solar radiation measurement significantly (even under cloudy conditions) without adding substantial cost. The CS320 is suitable for applications ranging from environmental research to agriculture to large mesoscale weather networks (mesonets).

The CS320 sensor is heated (on/off switchable under user control) and allows continuous operation in changing environmental conditions. The pyranometer's calibration data is stored on the sensor.

Key Specifications

  • Calibration Uncertainty: ± 5 %
  • Measurement Range: 0 to 2000 W m-2 (net short-wave irradiance)
  • Measurement Repeatability: < 1%
  • Long-Term Drift: < 2% (per year)
  • Non-Linearity: < 1%
  • Detector Type: Blackbody thermopile
  • Detector Response Time: 2 s
  • Field of View (FOV): 180°
  • Directional (Cosine) Response: < ±20 W m-2 (at 80° solar zenith)
  • Output: SDI-12 (version 1.4) 1200 bps
  • Operating Environment: -50° to +50°C (0 to 100% relative humidity)
  • Heater: 0.2 W (on-board)
  • Input Voltage Requirements: 6 to 24 Vdc
  • Uncertainty in Daily Total: < 5%
  • Error Due to Clouds: ±2 %
  • Factory Calibrations: Traceable to secondary standard blackbody thermopile pyranometers traceable to the world radiation reference in Davos, Switzerland.
  • Warranty: 4 years against defects in materials and workmanship



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