home / Carbon Monoxide Gas Sensor


The GDA 2525 Carbon Monoxide (CO) gas sensor is a 2 wire 4-20 mA Loop Powered device. It has an electrochemical carbon monoxide sensor unit which is temperature compensated and easily replaceable.

Designed, manufactured and supported locally in Australia.

The Carbon Monoxide gas sensor electronics are housed in a robust IP56 ABS sun tolerant plastic enclosure. Coming with user selectable ranges of 0-100, 0-150 and 0-200 ppm. The Carbon Monoxide sensor element is on a pluggable lead to allow ease of replacement. The sensor head and its electronics are housed in a metal enclosure giving it excellent RFI and EMC compatibility with a splash proof cover giving an IP53 rating.

  • User selectable ranges 0-100, 0-150 and 0-200 ppm (Factory calibration 0-200 ppm)
  • 4-20 mA o/p (For Voltage Output see the GDA 2625)
  • Low cost replaceable gas sensor element
  • Easy to install
  • Easy to calibrate (only gas and multimeter required)
  • ABS sun tolerant IP56 housing with sensor element IP53
  • Australian Factory Certificate of Calibration

Made in Australia and Supported in Australia

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Meets the requirements of AS/NZS 5149.3:2016

Designed, Manufactured and Supported in Australia.

Specification NameSpecification Value
ModelGDA 2525
Detectable GasesCarbon Monoxide (CO)
Detectable Gas Ranges0-200 ppm (0-100, 0-150 ppm ranges user selectable)
Detection TypeDiffusion
Sensor TechnologyElectrochemical Cell
Maximum Overload5000 ppm
Response TimeT90 = 45 seconds at STP
Accuracy of Reading0.5% of reading
Warm Up Time30 seconds
Zero Drift< 0.1% / 30 days
Calibration Drift< 0.25% / 30 days at STP
Calibration RequirementAnnually if senor operated at STP
Power Requirements+24 VDC
Output Types4-20 mA Loop Powered
Power Consumption <25 mA @ 24 VDC
Connection3 pin plug connector
Wiring2 core, 18 AWG with overall screen
Output SpecificationsMax loop impedance 680 Ω @ 24 VDC
Operating Temperature-10°C to 40°C
Operating Humidity15% to 90% RH peak non condensing
Operating Pressure800 to 1200 mbar
Cable Entry2 x M20 top entry
Enclosure MaterialPVC plastic
Dimensions122 x 85 x 62 mm (H, W, D)
Enclosure RatingIP56 with sensor element IP53

 GDA 2525 Carbon Monoxide (CO) Gas Sensor and Transmitter

  • M20 to 20mm Conduit Adaptor
  • User Manual
  • Australian Factory Certificate of Calibration
Part Number Range
2525-001 0-200 ppm (0-100, 0-150 ppm ranges user selectable)



Part Number Image Description
2525-002 Replacement Sensor Head
2500-001 GDA 2500/2600 Series Brass Calibration Cap Assembly, 250mm Nylon Tube Length
2500-005 4 x 10-24 x 3/4 (T25) Tamper Proof Security Machine Screws for GDA 2500/2600 Series Lid. incl. Wrench Key




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