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. Factory calibrated optional 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.

  • 4-20 mA o/p 
  • 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

Poisoning: GDA sensors are designed to operate in a wide range of harsh environments and conditions. However, it is important that exposure to high concentrations of solvent vapours is avoided, both during storage and operation.

Made and Supported in Australia

Related Products

Car Park Gas Monitoring Systems

The Gas Detection Australia car park gas detection system comprises of 1 up to 16 GDA 2525 carbon monoxide car park gas detectors per zone or level. 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 (AS1668.2-2012) call for variable extraction control and minimum flow rates. Gas Detection Australia car park system's allows variable-speed drive (VSD) control  that will meet this requirement of the australian car park gas detection standards. 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 calibrated in our factory prior to delivery and will only require wiring and connecting .

Designed, Manufactured and Supported in Australia.

Generator Rooms

A range of devices from single point go / no go detectors such as the DA-2010 through to sophisticated IEC Ex type gas detectors / gas sensors can be used for detection of Natural gas, Propane, Butane and various other mixtures.

Designed, Manufactured 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.

Meets the requirements of AS/NZS 5149.3:2016 and ISO 5149-3:2014

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)
Maximum Overload2000 ppm
Detection TypeDiffusion
Sensor TechnologyElectrochemical Cell
Cross SensitivityAcetylene 90% | Ethylene 96% | Hydrogen <35% | Nitric Oxide <10% (See manual for more details)
Response TimeT90 = 45 seconds at SATP (Standard Ambient Temperature and Pressure)
Accuracy of Reading± 3% of full scale reading in standard operating environment
Warm Up Time30 seconds
Zero Drift< 0.1% / 30 days
Calibration Drift< 0.25% / 30 days at SATP (Standard Ambient Temperature and Pressure)
Calibration RequirementEvery year with 6 monthly functional tests if sensor operated in standard operating environment
Typical Operating Life5 years before requiring sensor head replacement in standard operating environment
Warranty12 months from date of dispatch
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 Temperature10°C to 50°C (LT version -30°C to +10°C) Accuracy varies outside of range
Operating Humidity15% to 90% RH peak non condensing
Operating Pressure800 to 1200 mbar
Cable EntryUser provided
Enclosure MaterialABS plastic & Brass C385
Dimensions155 x 130 x 70 mm (H, W, D)
Enclosure RatingIP56 with sensor element IP53

GDA 2525 Carbon Monoxide (CO) Gas Sensor

  • GDA 2525 Fixed Gas Sensor Trasmiter & Module
  • User Manual
  • Australian Factory Certificate of Calibration
Part Number Range Replacment Sensor Module
2525-1 0-200 ppm 1525-1



Part Number Image Description
GC01-001 Gassing Cap with 500mm Length vinyl tubing
2500-005 4 x 10-24 x 3/4 (T25) Tamper Proof Security Machine Screws for GDA 2500/2600 Series Lid. incl. Wrench Key




CALGAS : Calibration Gas

To test and maintain accuracy gas detection systems require regular testing and calibration. GDA can provide you with a complete line of calibration equipment to calibrate all of our gas sensors and detectors. Our calibration gas cylinders all come with N.I.S.T. certification and ISO 17025 approval so you can be confident that you will receive gas with the highest accuracy levels.