The GDA 4500 is designed to be used where sensors are placed in areas that are difficult to gain access such as pits and elevated areas.
Designed, manufactured and supported locally in Australia.
The GDA 4500 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. Sensors require periodic calibration and in the case of electrochemical gas sensors they will require annual periodic replacement. The GDA 4500 can be fitted with a control unit in the same box as the sampling system that interfaces with the control to give a flow fail alarm. The remote control allows the 4500 sampling section to be adjacent to the area. The control unit to sampling unit requires a 4 core cable and can be up to 1000m from the GDA 4500 sampling unit.
Made in Australia 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 Name||Specification Value|
|Detectable Gas Ranges||See associated 2500 series sensor detail|
|Power Requirements||+24 VDC|
|Output Types||3 x SPCO for 3 alarm levels+ SPCO for fault/ flow fail|
|Output Specifications||Voltage free contacts 1A 240 VAC non inductive ;4-20 mA; Modbus|
|Connection||6mm tubing to filter head in location area|
|Technology||DC brushless vacuum pump 15000hrs rated|
|Dimensions||300 x 220 x 120 mm (L, W, D)|
|Enclosure Material||ABS Plastic|
|Cable Entry||Provided by user|
|Max distance of sensor||From GDA 4500 to Filter head 75 m|
|Gas transition time||In 6mm ID tube linear = 8m/ Sec|
|4500-2528||Oxygen Gas sampling system with built in control unit *|
|4500-2525||Carbon monoxide Gas sampling system with built in control unit|
|4500-2526||Ammonia Gas sampling system with built in control unit|
|4500-2527||Nitrogen dioxide Gas sampling system with built in control unit|
|4500-xxxx-R||xxxx (sensor type as above) Gas sampling system with REMOTE control unit|
* Important Note: Acid gases such as CO₂ and SO₂ will be absorbed by the electrolyte and tend to increase the flux of oxygen to the electrode. This gives an enhanced oxygen signal of approximately 0.3% of signal per 1% CO₂. GDA oxygen sensors are not suitable for continuous operation in concentrations of CO₂ above 25%.