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Discontinued Product

The GDA 490 is designed to control 1-8 GDA 290 sensors for applications where chiller/refrigerant plant is using PROPANE as the refrigerant gas.


Note: This product has been replaced by the GDA 2400

The control unit derives the 24 VDC required for the sensors from the mains i/p and activates a local 24 VDC o/p on alarm to drive a sounder/flasher AVR-20. The sounder flasher can be muted from the front panel. The alarm also activates a DPCO relay; the contacts may be used to shut down and pump down the system. The alarm is indicated on the front panel by LED’s.

  • Designed for refrigeration systems using propane
  • Easy to install
  • Controls up to 1-8 GDA 290 sensors
  • Local sounder on alarm which is mutable
  • LED indication of alarm status
  • LED indication of System operational
  • 2 x volt free contacts for pump down and shut off

Made in Australia and Supported in Australia


Related Products

GDA 4011 GDA 4020 GDA 2400

GDA 4011

Single Channel Gas Detection Controller

GDA 4020

Two Channel Gas Detection Controller

GDA 2400

Multiplexed 8 Channel Gas Detection Controller

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.

Specification NameSpecification Value
Power Requirements240V AC
Output Types2 x SPCO relays + 24v muteable driver
Output SpecificationsRelays 240V AC Non Inductive
Power Consumption< 1 W with no sensors connected
ConnectionPlug in connectors on main board
WiringLow voltage to sensors , 240V AC to control unit
Operating Temperature-10 to 40°C
Operating Humidity5% to 95% RH peak non condensing
Warm Up Time< 10 secs
Response Time< 1 sec
Calibration RequirementNONE
Dimensions153 x 90 x 60 mm
Enclosure MaterialABS Plastic
Enclosure RatingIP55
Cable EntryOn side of enclosure provided by user
Product Description
GDA490  Control unit GD290 240v ac mains i/p up to 8 GD290 sensors