Precision (PYR-P) and amplified (PYR-PA2.5, PYR-PA5) models

The Pyranometer Sensor is calibrated to measure the shortwave radiation reaching the Earth's surface. The evaporation of water from soil and the transpiration of water from leaves are partly determined by the intensity of this shortwave radiation, which is measured in Joules m-2 s-1 or Watts m-2.

Model PYR-P (a Precision Pyranometer Sensor) is held to tighter manufacturing specifications, has better cosine response, and is calibrated over a multiple day period to a heated and ventilated Kipp & Zonen model CM21 thermopile radiometer. Model PYR-P has improved accuracy over the previous standard Model PYR-S (formerly Model PYR).

Specifications

• Output
  
  • 0.200 mV / W m-2
    
  • Output in full sunlight: 220 mV (1,100 W m-2)
    
  • Output linear to: 320 mV (1,600 W m-2)
  
  
• Sensitivity
  
  • 5.00 W m-2 / mV
  
  
• Power Requirements
  
  • None, Self-powered
  
  
• Operating Environment
  
  • -40 to 55 °C; 0 to 100% relative humidity. Designed for continuous outdoor use. Can be submerged underwater.
  
  
• Temperature Response
  
  • <1 % from 5 to 40 °C
  
  
• Materials
  
  • Type II anodized aluminum with acrylic diffusion disk; the only visual difference between Model PYR-P and Model PYR-S is the precision model has yellow lead wire at the entry to the sensor.
  
  
• Dimensions & Mass
  
  • 24 mm dia., 27.5 mm tall
    
  • 70 g (with 2 m lead wire)
  
  
• Cable
  
  • 3 meters of shielded, twisted-pair wire with Santoprene casing, ending in pigtail leads:
    
  • Red wire is positive / high
    
  • Black wire is negative / low
    
  • Bare / clear wire is shield (ground)
    
  • Sensors can be built with additional cable
  
  
• Warranty
  
  • 1 year parts and labour

Model PYR-P

• Cosine Response
  
  • ± 5% at 75 degrees
    
  • ± 1% at 45 degrees
  
  
• Daily Total Radiation Absolute Accuracy
  
  • ± 5%
  
  
• Daily Total Radiation Reproducibility
  
  • ± 1%