The GDA 3100 Refrigerant Gas Detector uses the latest in NDIR techniques for detecting a wide range of refrigerant gases and is immune from cross sensitivity to other gases. In addition it is immune to changes in humidity and temperature with a longer lifespan then standard semiconductor sensors.

Designed, manufactured and supported locally in Australia.

The GDA 3100 has a configurable analog output of 4-20 mA; 0-20 mA; 0-5 V; 0-10 V and a volt free relay which can be user programmed to operate anywhere within the sensor range. The unit is powered from 24 VDC.

  • Standalone system or 4-20 mA o/p sensor or both
  • User definable alarm point (relay operation)
  • 1 SPCO alarm relay (volt free)
  • User selectable 4-20 mA or 0-20 mA 0-5 V 0-10 V o/p
  • 24 VDC operation
  • Robust housing
  • Immune to changes in humidity and temperature
  • Easy to install
  • Annually with 6 monthly functional tests
  • 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.

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 GasesRefrigerant Gas (See Ordering Information)
Power Requirements24 VDC
Output Types0-20 mA, 4-20 mA, 0-5 V, 0-10 V (4-20 mA Default)
Output Specifications4-20 mA max 1K at 24 VDC supply (4-20 mA); Voltage: i/p Z for voltage o/p options 10K > Relay NC NO Comm. 1A at 24 VAC
Power Consumption<300 mW (average)
Connection4 pin plug connector and 3 screw down Relay contacts NC, NO, Comm (volt free)
Wiring3 core cable with overall screen, Screen to be connnected to earth at control unit end only
Operating Temperature-20 to 40°C (applications below 5°C low temperature version required Order No. 3100-0x-LT)
Operating Humidity5% to 95% RH peak non condensing
Accuracy of Reading1% Full scale
Warm Up Time<2 minutes, Sensor Accurate After: <30 minutes
Response TimeApprox. 30secs
Zero Drift≤2% Full scale p.a
Calibration Drift≤2% Full Scale p.a
Sensor TechnologyNon Dispersive Infra-Red (NDIR), Dual Wavelength
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 Refrigerant Gas Detector

  • GDA 3100 Fixed Gas Detector
  • User Manual
  • Australian Factory Certificate of Calibration
Gas 0-1000 ppm 0-2000 ppm
R134a 3100-004 3100-004-02
R125 3100-005 3100-005-02
R123 3100-006 3100-006-02
R404a 3100-007 3100-007-02
R410a 3100-008 3100-008-02
R22 3100-009 3100-009-02
R407a 3100-010 3100-010-02
R407c 3100-011 3100-011-02
R514a 3100-012 -
R1234yf 3100-013 3100-013-02
R1234ze 3100-016 3100-016-02
R507 3100-017 3100-017-02
Other Gases Available On Request
Add "-LT" Suffix for low temperature version for applications below 0°C



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




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.