Intrinsically Safe Gas Detectors FGD3 Series

Oxygen (Deficiency) Detector

Intrinsically Safe Oxygen Detector


  • Range 0-21% Oxygen, O2. Note - the instrument must not be used in an oxygen enriched atmosphere.
  • 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.
  • Marine version available.
  • Optional weather guard available.


The FGD 3 Oxygen Detector use electrochemical sensor technology to detect for oxygen deficiency in the atmosphere in personal safety applications. 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.

Marine Version

A marine version of the FGD3 is also available. This version is housed in a cast aluminium enclosure to provide higher RFI immunity where high power portable radios are used in the close confines of a vessel. The enclosure is plated and painted in order to withstand the harsh salt spray environment of the marine industry. The digital display is fitted with a sliding stainless steel front cover which remains over the display window when not being viewed thereby maintaining the RFI shielding properties of the enclosure during normal operation.

FGD3 Weatherguard

An optional weather guard is available for installations exposed to the atmosphere or contaminants and is also suitable for use in other areas where hosing down takes place. The weather guard reduces the possibility of water or other contaminants entering into the gas sensor thereby improving the overall reliability of the gas detector in harsh environments.The weather guard is attached with tamperproof screws to ensure that it is not inadvertently removed.

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 Oxygen Deficiency Detectors - Order Codes

Stock No. Description
SS401 FGD3 Oxygen Detector - (4-20mA Output) - Range 0-21% O2
SS401-M FGD3 Oxygen Detector - Marine Version - (4-20mA Output) - Range 0-21% O2
SS475 FGD3 Series Protective Weather Guard

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