INFORMATION SHEET
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The GD 4508/16 is a 1 to 16 point gas sampling system for use in commercial buildings to control fresh air make up in rooms relative to external fresh air. Available for: Carbon Monoxide (CO), Oxygen (O₂) or Carbon Dioxide (CO2).

Designed, manufactured and supported locally in Australia.

The GD 4508/16 outputs relative gas level via the Modbus Slave Interface, allowing for BMS control of the air make up of each room relative to external fresh air. Each room is sampled approximately every 10 minutes (dependent on the number of lines and length of lines). The GDA 4508 is placed in an accessible location up to 50M from the filter head; this is the actual sampling point where the sample is being drawn from. The gas is drawn via 6mm ID tubing from the area that needs to be tested and is passed over the sensor element. The end of line filter prevents dust and mycological build up in the line. There is an inbuilt flow fail detector to ascertain that the vacuum pump is operational.

  • Flow fail ( blockage ) signal per line (Modbus register)
  • Sensor failure signal ( Modbus register)
  • Long life dc brushless vacuum pump
  • End of line filter to prevent build-up of dust in sample line
  • All measurements relative to external fresh air
  • Sensor auto-calibrates to fresh air input
  • High level Interface to Modbus
  • Modbus RTU address selectable
  • Readings in Modbus buffers are relative to fresh air measurement not PPM
    • Example
    • external air measurement 500ppm
    • room measurement 1000ppm
    • buffer value (1000/500) x 100 = 200%
      •  if external air gas reading varies so will % in buffer
      • If sensor reading varies then both sides of components of the relative equation vary by the but the relative % will be the same

Made in Australia and Supported in Australia

 

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

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

Designed, Manufactured and Supported in Australia.

Lift Shaft Wells

Oxygen sensors are often placed in lift shaft wells to measure the atmosphere prior to entry. Problems arise due to the pressure changes in the left shaft well due to the air movements associated with the lift.resulting in false alarms . There is also an issue associated with safe work permits for access into the lift shaft area when the oxygen sensor requires calibration or replacement. The GDA 4500 system uses a vacuum pump (dc brushless) , a flow fail mechanism and a sensor  to extract the gas via a 6mm ID tubing. The Nylon tube is fitted with a filter element to provide dust filtering and prevent mycological build up in the sampling line.

Designed, Manufactured and Supported in Australia.

Specification NameSpecification Value
Product Description
4508-11 Eight Point Carbon Monoxide Detection Sampling System.
4508-20 Eight Point Oxygen Detection Sampling System.
4508-31 Eight Point Carbon Dioxide Detection Sampling System. Range 0 – 2000 PPM
4508-32 Eight Point Carbon Dioxide Detection Sampling System. Range 0 – 5000 PPM
4508-33 Eight Point Carbon Dioxide Detection Sampling System. Range 0 – 10 000 PPM
4508-34 Eight Point Carbon Dioxide Detection Sampling System. Range 0-5% vol
4508-35 Eight Point Carbon Dioxide Detection Sampling System. Range 0-20% vol
4516-31 Sixteen Point Carbon Dioxide Detection Sampling System. Range 0 – 2000 PPM

 

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