PYR2-420 – Class C Thermopile Pyranometer

Last update

PYR2-420 is an ISO 9060 Class C (Second Class) Thermopile Pyranometer.

It has a simpler construction than the Class B, but uses the same high quality materials.

Class C Thermopile Pyranometer casing

As the Class C is equipped with the same electronics as the Class B, the signal has a high level of linearity and noise immunity. The signal is normalized in the 4 to 20mA range.

This analog output mode of the signal (current loop) is characterized by a simple wiring (cable with 2 wires), and a high immunity to electromagnetic interference and interference caused by distances of over ten meters.

This instrument is suitable for measuring solar power and monitoring the efficiency of photovoltaic systems when a precision of 5% – 10% is sufficient.

Note: the terms irradiance sensor, photovoltaic pyranometer, reference cell and solarimeter are interchangeable. On this site we will use photovoltaic pyranometer. To learn more click here.

Key features of a Class C Thermopile Pyranometer

  • Thermopile sensor (300 ÷ 2900 nm)
  • Single dome in hemispherical optical type glass with high transparency
  • Anodized aluminum body ideal for outdoor use
  • Current loop output 4÷20 mA with 4 mA (± 0.01mA) @ 0W/m2 and 20mA (± 0.03mA)
  • 50m current loop cable
  • High weather resistance
  • ISO 9060 compliant
  • Accurate calibrations with a Secondary Standard (Class A Pyranometer) rechecked every 12 months.
  • 2 year warranty


  • Cable lengths: 3, 5, 10, 20 m
  • Bracket for Plane of Array installation
  • Bracket for pole installation
  • Albedo mounting kit (on request)


PRODUCT Class C Thermopile Pyranometer
REFERENCE STANDARDS ISO 9060:1990, ISO 9060:2018
OUTPUT 4÷20 mA current loop
Calibration ISO9847 compliant With a Secondary Standard Pyranometer, certified calibration
Spectral Sensitivity 300÷2900 nm
Input range Irradiance 0÷1600 W/m2
Response time < 25 seconds
Working temperature -40 ÷ +80°C
Output Current Loop 4÷20mA normalized output
Precision Tilt response angle (0÷90°) <± 4%
Response temperature ( ∆t = 50°K) < 8%
Supply 9÷30 Vdc protected against short circuit
Encapsulation Quartz [k5] dome Optical glass with elevated transparency: 0.3÷3 μm
Case Anodized Aluminum
Connectors standard M8 3 pin female
Dimensions Φ 162 x h 104 mm

(1) recommended recalibration within 20-24 months to maintain the specifications declared in calibration


Protection against lightening

Protects irradiance sensors and photovoltaic monitoring equipment from lightening induced overvoltages. Discover Blitz-Wall!


Drop us a line for free and impartial advice from highly experienced professionals.