Intrinsically Safe Gas Detectors FGD3 Series

Sulphur Dioxide Gas Detector

Intrinsically Safe Sulphur Dioxide Gas Detector


  • Range 0-20ppm Sulphur Dioxide SO2.
  • Suitable for use in Zones 0, 1 and 2 hazardous areas.
  • Two wire connection.
  • 8 to 24 volt dc operation.
  • Industry standard 4 to 20mA output.
  • Digital display.
  • Single operator calibration.


The FGD 3 Sulphur Dioxide Gas Detector uses electrochemical sensor technology to detect the level of Sulphur Dioxide in the atmosphere over the range 0 - 20ppm. The detectors use the industry standard 4-20mA current loop both to power the detector and to convey the gas levels detected to a control unit. This means that under zero gas conditions 4mA is drawn from the supply, and under full scale gas conditions 20mA is drawn from the supply. The current varies linearly for gas levels between zero and full scale. The detector head uses a two-wire connection.

FGD3 Series Data Sheet

Hazardous Area Certification Data

Certificate Number - BAS 01ATEX2300
II 2 G Ex ia IIC T4 Gb (-20 deg. C <Ta< +60 deg. C)
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FGD3 Sulphur Dioxide Detectors - Order Codes

Stock No. Description
SS409 FGD3 Sulphur Dioxide Gas Detector - (4-20mA Output) - Range 0-20ppm SO2

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