The GDA 2525 Carbon Monoxide 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 GDA 2525 comes with user selectable ranges 0-100, 0-150 and 0-200 ppm. The Carbon Monoxide sensor element is on a pluggable lead to allow ease of replacement. The Carbon Monoxide gas sensor electronics are housed in a robust ABS sun tolerant plastic enclosure rated IP65; the sensor head and its electronics are housed in a metal enclosure giving it excellent RFI and EMC compatibility. The sensor head is fitted with a splash proof cover giving an IP62 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 IP66 housing (sensor element IP62)
  • Australian Factory Certificate of Calibration

Made in Australia and Supported in Australia

Air Conditioning Monitoring

Air conditioning gas detection systems are used in a number of ways. In air conditioning plant rooms  Gas Detection Australia  has  gas sensors and gas detectors  for Ammonia , Propane, CO2 and  R134a, R123, R125, R404, R407c  R410a etc. In enclosed laboratories classrooms and workspaces. The Gas Detection Australia  range of flush mounted Air Conditioning gas sensors for Carbon Dioxide GDA 4360 are used by the HVAC industry  to control fresh air input into rooms and modulate supply. In the case of VRF systems needing room air conditioning gas detection  HVAC industry  uses the flush mounted GDA 3160 which are unobtrusive and used to detect low  levels of R134a, R123, R404, R407c, R410 etc.


Car Parks

The Gas Detection Australia car park gas detection system comprises of 1-8 GDA 2525 carbon monoxide car park gas detectors and a control unit type GD2400. The car park gas concentration signals are sent from the car park gas detector  and the highest level from all the car park gas detectors are  displayed locally on the control unit.  The latest regulations (2012) call for variable extraction control and minimum flow rates. The Gas Detection Australia  car park system allows VSD control  that will meet all the requirements of the  car park gas detection standard . The car park carbon monoxide sensors (GDA 2525) are designed to be unobtrusive , simple to install and calibrate. All systems manufactured by Gas Detection Australia  are built , programed and tested in our factory prior to delivery and will only require wiring and connecting .

Meets all the requirements of AS1668.2-2012

Designed, Manufactured and Supported in Australia.

Generator Rooms

A range of devices from single point go / no go detectors such as the GDA 290 through to sophisticated IEC Ex type gas detectors / gas sensors can be used for detection of Natural gas, Propane, Butane and various other mixtures.


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
Response TimeT90 = 45 seconds at STP
Accuracy of Reading0.5% of reading
Warm Up Time30 seconds
Zero Drift< 0.1% / 30 days
Calibration Drift< 025% / 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 1 kΩ @ 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 MaterialABS plastic
Dimensions122 x 85 x 62 mm (H, W, D)
Enclosure RatingIP65 with sensor element IP62

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