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CO233/A – Carbon Monoxide Gas Sensor with Display

The CO233/A is Carbon Monoxide (CO) gas sensor with display for detection of Carbon Monoxide (CO). The sensor is compatible with the complete range of Duomo conventional gas controllers. It features a Time weighted average (TWA) feature that can indicate when gas levels have been over lower levels for a set time periods.

Other versions

Quantity discount

Quantity 1-4 5-9 10-14 15+
Price £264.73 £251.49 £238.26 £225.02



The CO233/A is a gas sensor for detection of Carbon Monoxide (CO) gas. A 4-20mA signal output is sent to any one of the Duomo controller panels listed. Furthermore the autosetting function keeps maximum detection accuracy at any time.

The 6 colour display informs the user of the status and CO levels. For example the Short term exposure limit (STEL) over 15 minutes and the time weighted average (TWA) over 8 hours. These levels are constantly tested and the display changes accordingly. 300ppm activates the main alarm relay. Another key point is the 0-300ppm linear output conforms to the 4-20mA standard.

According to the principle of accumulation, could also be toxic. The sensor is EN50270 & EN45544-1-3 compliant.


Product Details

  • Autosetting feature for calibration and Diagnosis
  • Preset to TWA and STEL Standards
  • 6 Colour Display for increased visibility
  • IP65 Protection
  • 4-20mA Industry Standard Output
  • Conventional GS or BX Control Unit Compatible
  • EN50270 & EN45544-1-3 Compliant
  • 3 year guarantee


Onsite Diagnostics

If you require onsite diagnostics or technical assistance with any of our products please contact us

  • This field is for validation purposes and should be left unchanged.


We recommend Duomo Gas Detection products are serviced at least annually to ensure efficacy and extend sensor life. Our qualified team of engineers are available Nationwide.



  • CO233A Datasheet

    2.10 MB | pdf


Support & Service

If you require technical assistance or an annual service on this product please contact us and we will be happy to help. Our qualified team of engineers are available Nationwide.

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