The GDA 4350 is a 3 wire Non Dispersive Infra red (NDIR) Carbon Dioxide (CO₂) sensor. It gives a 4-20 mA, 0-20 mA, 0-5 V or 0-10 V o/p over the range of the sensor. Low Temperature version available.

Designed, manufactured and supported locally in Australia.

Housed in an ABS plastic case with an aperture for the gas path. It uses laser LED to give reliable performance. Calibration for non critical safety applications is every 3 years. The low temperature version (suffix LT) operate from - 25°C to 30°C.

  • 24 VDC, 3 Wire Operation
  • 4-20 mA, 0-20 mA, 0-5 V or 0-10 V o/p linear over range of sensor
  • Ultra low cross sensitivity to other gas
  • Temperature and humidity compensated
  • Multiple ranges
  • No moving parts.
  • Factory calibrated
  • Low drift

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

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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

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Laboratory and Classroom Monitoring

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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.

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Cryogenic Room Gas Detection

Cryogenic freezing using liquid Nitrogen poses a problem of oxygen depletion. The GDA 2528 oxygen gas sensor offers a cost effective method of detection and low cost of maintenance. For standalone cyro-storage chambers housed in laboratories, the storage area can be monitored for oxygen depletion by the standalone GDA 40125 system.

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Cold Room Monitoring

The use of Carbon Dioxide gas detectors / gas sensors or Nitrogen gas detectors / gas sensors in cold rooms can result in asphyxiation if the levels get too high . Work place health and safety places a requirement for monitoring these gases

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Designed, Manufactured and Supported in Australia.

Specification NameSpecification Value
Detectable GasesCarbon Dioxide (CO₂)
Detectable Gas Ranges0-2000 ppm; 10000 ppm; 5% vol; 20% vol; 100% vol
Power Requirements24 VDC
Output Types4-20 mA, 0-20 mA, 0-5 V or 0-10 V
Power Consumption<30 mA @ 24 VDC
Output Specificationsmax loop Impedance 800R @ 24 VDC
Wiring3-wire (0.75mm2) with overall screen
Operating Temperature5°C to +45°C (LT version to -20°C to +45°C)
Operating Humidity5% to 95% RH peak non condensing
Operating Pressure900 - 1100 mbar
Accuracy of Reading +- 2% FSD +-0.5% reading at SATP
Warm Up Time<30 sec
Response TimeT90 < 20 sec at SATP
Zero Drift<0.5% FSD for 90 days at SATP
Calibration Drift<0.5% FSD for 90 days at SATP
Sensor TechnologyNon Dispersive Infra-Red (NDIR)
Calibration RequirementAnnually with 6 monthly functional tests if sensor operated at SATP.
Warranty12 months from date of dispatch
Dimensions115 x 130 x 71 mm (L, W, D) Mounting holes 105 x 75 mm
Enclosure MaterialABS plastic
Cable EntryUser Provided
GDA 3100

 GDA 4350 Carbon Dioxide (CO₂) Gas Sensor

  • GDA 4350 Fixed Gas Sensor
  • User Manual
  • Australian Factory Certificate of Calibration
Part Number Range
4350-01 0-2000 ppm
4350-02 0-10,000 ppm (1% Vol)
4350-03 0-5% Vol
4350-04 0-20% Vol
4350-06 0-100% Vol
Add "-LT" Suffix for low temperature version for applications below 0°C to -25°C



Part Number Image Description
GC02-001 Gassing Cap with 500mm Length vinyl tubing




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.