SGR3

The SGR3 is a pyrgeometer, designed for meteorological measurements of downward atmospheric long wave radiation.

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CGR 3

Key features

  • RS-485 Modbus® communication
  • No change of desiccant for 10 years
  • 5 year warranty (*)

The SGR3 uses a specially designed silicon window. On the inside a solar-blind filter blocks solar radiation. The SGR3 data represents the radiation exchange within the whole hemisphere. This is because the reference SGR3 is calibrated outdoors with respect to a reference CGR4, which has a 180 degrees field of view.

The SGR3 has Modbus® interface, amplified analogue output, improved response time and temperature corrected measurement data. The long wave net- and downward radiation are directly available over Modbus®. The wide and low power supply range from 5 to 30 VDC makes integration in meteorological and solar energy stations easy. The SGR3 is extremely robust and comes with 5 years warranty (*).

The base of the instruments contains the mounting holes, a spirit level and levelling feet for exact levelling. For ease of mounting, exchange, and recalibration, the instruments have a waterproof connector. The improved temperature dependency and directional response makes these instruments the ideal choice for meteorological and agricultural applications.

Thanks to standardised output and connections of every SGR3, exchanging instruments for recalibration is easy.

SmartExplorer Windows™ software for data logging, display of data and Modbus® address setting is provided as standard.

(*) This product will need to be registered by the end-user within 6 months of purchase to activate the warranty extension.

Technical specification

Spectral range (overall) 4.4 to 50 µm = 4400 to 50000 nm
Response time (95%) < 18 s
Window heating offset < 15 W/m²
Zero offset B < 5 W/m²
Temperature dependence of sensitivity (-10 ºC to +40 ºC) < 3 %
Operational temperature range -40 to +80 °C
Field of view 150 °
Non-linearity < 1 %
Analogue output (-A / -V version) 4 to 20 mA / 0 to 1 V
Digital output 2-wire RS-485

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