Discontinued Product

The GDA 40126 Gas Detection Controller is a standalone gas detector unit with inbuilt display, sounder, flasher, relays and alarm driver. Available for Flammable gases such as LNG, LPG, Propane, Hydrogen, Acetylene, Solvents, and other flammable vapours. Designed to be used in Non-hazardous areas with the GDA 2500 series easily replaceable sensor modules.

Designed, manufactured and supported locally in Australia.


This product is being replaced by the SENKO SI-100-009 Combustable Sensor

SENKO SI-100: Explosion Proof Gas Detector

The GDA 40126 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.

  • Gases available Methane, Propane, Butane, Acetylene, Hydrogen, Solvents 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.
  • External Mutable drive for AVR-20 series sounder / flasher unit.
  • 1 Fault relay (SPCO)
  • 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 in Australia and Supported in Australia

Related Products

Sewage Treatment Plant Monitoring

The presence of Hydrogen Sulphide  can be detected by using the Gas Detection Australia GDA 2529 gas sensor to detect leaks of Hydrogen Sulphide  and evoke deodorisation plant. The SI-100C gas sensor can be used to monitor for leaks of LEL levels of methane gas. In digester applications Carbon dioxide can be detected using the GDA 4350  

Designed, Manufactured and Supported in Australia.

Specification NameSpecification Value
Detectable GasesFlammable Gas
Detectable Gas Ranges0-100% LEL of selected Gas
Power Requirements+24 VDC
Output Types2 x SPCO relays (alarm), 1 x Fault relay SPCO; 4-20mA . optional MODBUS
Power Consumption2.5W
Output Specifications Relays 220v , 1 A , non inductive
Connection Plug in connector
Wiringmin 0.75mm2
Operating Temperature-10 - 40°C
Operating Humidity5% to 95% RH peak non condensing
Accuracy of Reading0.5% of reading + 1% FSD
Warm Up Time30 seconds
Response Time T90= 15 seconds
Zero Drift < 0.5% per 30 days
Calibration Drift<5% pa @ SATP
Sensor TechnologyCatalytic Cell
Calibration RequirementAnnually with 6 monthly functional tests if senor operated at SATP
Warranty12 months from date of dispatch
Dimensions155 x 130 x 65 mm (L, W, D)
Enclosure MaterialABS plastic
Enclosure RatingIP53
Cable EntryUser provided

GDA 40126 Flammable Gas Detector

  • GDA 40126 Fixed Flammable Gas Detector Controler & Sensor Module
  • User Manual
  • Australian Factory Certificate of Calibration
Part Number Gas Range Replacment Sensor Module
40126-001 Methane (CH₄) 0-100% LEL 2560-001M
40126-002 Propane (C₃H₈)
40126-003 Hydrogen (H₂) 2560-014H
40126-004 Acetylene (C₂H₂) 2560-013A
40126-005 General Solvents, IPA  
40126-006 No Sensor Module Fitted



Part Number Image Description
4012X-001   GDA 4012X Series RS485 Modbus Output Addon Card
GC01-001 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.