The GDA 2529 Hydrogen Sulphide gas sensor is a 2 wire 4-20 mA loop Powered device with a range of 0-50 ppm Hydrogen Sulphide. It has an electrochemical sensing unit which is temperature compensated and easily replaceable.

Designed, manufactured and supported locally in Australia.

The sensor element is on a pluggable lead allow ease of replacement. The hydrogen sulphide gas sensor electronics are housed in a robust ABS sun tolerant plastic enclosure rated IP65; the sensor head and its electronics are housed in a metal enclosure giving it excellent RFI and EMC compatibility. The sensor head is fitted with a splash proof cover giving an IP62 rating.

  • 0-50 ppm (Other ranges on request)
  • 4-20 mA o/p (For Voltage Output see the GDA 2629)
  • Low cost replaceable gas sensor element
  • Easy to install
  • Easy to calibrate (only gas and multimeter required)
  • ABS sun tolerant housing
  • 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
ModelGDA 2529
Detectable Gases Hydrogen Sulphide (H₂S)
Detection TypeDiffusion
Detectable Gas Ranges0-50 ppm
Sensor TechnologyElectrochemical Cell
Cross SensitivityCarbon Monoxide <2%
Power Requirements+24 VDC
Output Types4-20 mA Loop Powered
Power Consumption<25 mA @ 24 VDC
Output SpecificationsMax loop impedance 680 Ω @ 24 VDC
Connection3 pin plug connector
Wiring2 core 18 AWG with overall screen
Operating Temperature-10°C to 40°C
Operating Humidity15% to 90% RH peak non condensing
Operating Pressure800 to 1200 mbar
Accuracy of Reading± 3% of full scale reading in standard operating environment
Maximum Overload500 ppm
Warm Up Time30 seconds
Response TimeT90 = 45 seconds at SATP
Zero Drift< 0.1% / 30 days
Calibration Drift< 0.25% / 30 days at SATP
Sensor TechnologyElectrochemical Cell
Calibration RequirementAnnually with 6 monthly functional tests if senor operated at SATP
Typical Operating Life2 years before requiring sensor head replacement in standard operating environment
Warranty12 months from date of dispatch
Dimensions115 x 85 x 62 mm (H, W, D)
Enclosure MaterialPVC Plastic & PTFE
Enclosure RatingIP56 with sensor element IP22
Cable Entry2 x M20 top entry

GDA 2529 Hydrogen Sulphide (H₂S) Gas Sensor

  • GDA 2529 Fixed Gas Sensor Trasmiter & Module
  • 1x M20 to 20mm Conduit Adaptor
  • User Manual
  • Australian Factory Certificate of Calibration
Part Number Range Replacment Sensor Module
2529-001 0-50 ppm 2529-002



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




GDA 4022 : Two Channel Gas Detection Controller

The GDA 4020 control unit has 2 x 4-20 mA i/p with 3 associated programmable relay alarm levels per sensor. There is an independent fault relay. There are 3 x analog o/p’s which can be configured for either channel as 4-20 mA, 0-20 mA, 0-5 V or 0-10 V. The controller has an isolated RS485 o/p which can be configured to drive modbus or an interface to the M2001 mimic panel. All configurations are carried out via the front panel push buttons. The unit requires 24 VDC.

Designed, manufactured and supported locally in Australia.

GDA 4288 : 8 Channel Gas Detection Controller

The GDA 4080 Gas Detection Controller is designed to be to take up to eight sensor inputs and display the gas readings of the individual sensors. The multi-colour display will indicate the alarm status, levels and faults.

Designed, manufactured and supported locally in Australia.

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.

GDA 4011 : Flush Mount Single Channel Gas Detection Controller

Discontinued Product

This is a flush wall mounted (Clipsal GPO) single channel control unit. It interfaces to all the GDA a series of 4-20mA sensors. There are 3 relay o/p’s, Alarm 1, 2, and fault. These relays are SPCO. The backlit LCD display indicates current gas concentration and alarm status. There is an internal sounder which can be muted from the front panel. The unit requires 24v dc.

Designed, manufactured and supported locally in Australia.