The GDA 40127 Carbon Dioxide Gas Detection Controller is a standalone gas detector unit with inbuilt display, sounder, flasher, relays and alarm driver using an non dispersive infra red sensor.

Designed, manufactured and supported locally in Australia.

The GDA 40127 has 2 user relays which can be programed to operate at any level within the gas detectors operational range as well as an independent fail safe fault relay. The unit's alarm state is indicated by the display and by flashing LEDs additionally there is an o/p to drive a 24 VDC sounder / flasher (AVR-20) all of which can be muted from the front panel.

  • Available for 0-10000 ppm, 0-2000ppm, 0-5% vol ranges and others on request
  • 24 VDC operation with optional plug mounted power supply
  • 4-20 mA o/p and optionally Modbus o/p
  • Backlit LED display
  • Real time display of gas concentration
  • Mutable internal sounder
  • 2 User selectable/ configurable alarm relays (SPCO)
    • Alarm relays are inhibited during calibration.
  • 1 Fault relay (SPCO)
  • External Mutable drive for AVR-20 series sounder / flasher unit.
  • Australian Factory Certificate of Calibration

Made in Australia and Supported in Australia


Related Products

Refrigerant Plant Room Monitoring

Refrigerant gases are used to provide a means of cooling the evaporators in freezers and air conditioning for plant rooms and chiller plants. Historically CFC refrigerant gases such as R11, R12 and R22 have been used. CFC’s are ozone depleting gases and are now being phased out and replaced by ozone friendly gases such as R134a, R407 and R410a.

Why is there a need to detect them?

  • All these gases are toxic at relatively low levels. Prolonged exposure to these gases is hazardous and results in serious health risks. GDA sensors can detect these gases at very low levels, in order to prevent this hazard becoming a danger to life.
  • Air conditioning systems and chillers that are leaking their refrigerant gases are not performing to maximum efficiency. The major use of refrigerant gases is in the re charging of these systems. If leaks are detected early the problem can be alleviated much quicker, saving costs on replacement gas, co maintenance and protecting the environment.
  • Gas detection at low levels (part per million) will give an early warning of leakage, therefore safeguarding life and maintaining the efficiency of the plant.

Gas Detection Australia has a range of ultra-low level refrigerant gas leak detection systems specifically developed to prevent the expensive results of refrigerant gas leaks for R22, R123, R134a, R404, R407, R410a, R514a, R1234yf and many others.

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

Designed, Manufactured and Supported in Australia.

Cellar Gas Detection

The Gas Detection Australia uses the latest patented laser source technology to provide reliable accurate and cost effective solutions for Carbon Dioxide gas detection in cellar gas detection applications. The Carbon dioxide cellar gas detection system comprises of a remote  carbon dioxide gas detector / gas sensor, an external  control unit + power supply (to view the gas levels and alarms before entry ) and a audio visual sounder/ flasher that  will activate on alarm. Gas Detection Australia offers a range of solutions to meet individual site requirements for carbon dioxide  cellar gas detection systems  and oxygen  cellar gas detection  when using nitrogen for  pre-mix drinks

Meets the requirements of AS5034-2005

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
Detectable GasesCarbon Dioxide (CO₂)
Detectable Gas Ranges0-2000 ppm, 0-10000 ppm (1% vol), 0-5% vol
Power Requirements+24 VDC
Output Types2 x alarm relays, fault relay, 4-20 mA o/p, 24 VDC sounder o/p
Power Consumption2.5 W
Output SpecificationsMax loop impedance 1K (24V)
Connection Push in connectors on PCB
Wiring2 core min 0.75mm2 screened
Operating Temperature-10 - 40°C
Operating Humidity5% to 95% RH peak non condensing
Accuracy of Reading+- 2% FSD +-0.5% reading at SATP
Warm Up Time<40 seconds
Response TimeT90 < 35 secs at 0.5 l/m diffused
Zero Drift< 0.1% full scale per 30 days at SATP
Calibration Drift <0.1 % per annum at SATP
Sensor TechnologyNon Dispersive Infra-Red (NDIR)
Calibration RequirementEvery 3 years with 6 monthly functional tests in standard operating environments
Warranty12 months from date of dispatch
Typical Operating Life10 - 15 years in standard operating environment
Dimensions155 x 90 x 65 mm (L, W, D)
Enclosure MaterialABS plastic
Enclosure RatingIP20
Cable EntryUser provided

GDA 40127 Carbon Dioxide (CO₂) Gas Detector

  • GDA 40127 Fixed Gas Detector Controler & Sensor Module
  • User Manual
  • Australian Factory Certificate of Calibration
Part Number Range
40126-001 0-10,000 ppm (1% Vol)
40126-002 0-2000 ppm
40126-003 0-5% Vol



Part Number Image Description
4012X-001   GDA 4012X Series RS485 Modbus Output Addon Card
GC02-001 Gassing Cap with 500mm Length vinyl tubing
PSP1-24-075 Australian Mains Plugpack Power Supply. Output: 0.75 A @ 24 VDC
PSE Enclosed 24 VDC Power Supply




PSP : Plugpack 24 VDC Power Supply

The PSU P24 is an AC-DC plugpack power supply with an output of 24 VDC at 0.75A. The plugpack has a 3m cable with a 2.1 mm DC plug.

AVR 20 : Alarm Flasher and Sounder

This sounder/flashers operates at 24VDC. The sounder can be permanently disabled so that unit acts as a flasher only. These units are designed for internal use. These are available in Red or Amber.

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.