The Gas Diffusion Permeameter is an invaluable tool for assessing the permeability of different gases through materials with membrane-like properties. This method enables researchers to study gas transport under various static and dynamic conditions. The instrument is designed with a high-vacuum vacuum pump that is capable of detecting even the slightest amount of gas permeability. The Gas Diffusion Permeameter is versatile and able to accommodate samples of varying shapes, such as flat sheets, hollow fibers, and tubes. It is a reliable tool for studying gas transport properties in a range of materials.
To detect minuscule gas transmission rates through a sample, direct flow measurement using flow meters is not reliable due to their lack of accuracy. Instead, Diffusion Permeameters indirectly measure low gas flow rates by observing the time rate of change of pressure on the outlet side.
The sample is loaded into the sample chamber which is divided into two chambers - one on the inlet side of the sample and the other on the outlet side of the chamber. The volume of the outlet chamber is measured precisely, and both sides of the sample are evacuated. A specific amount of test gas is then introduced to the chamber on the inlet side of the sample, maintaining its pressure almost constant, while monitoring the pressure on both sides of the sample. The two pressures are then recorded over time, and the data is used to compute the transmission rate. In order to ensure the utmost precision, the system is kept at a constant temperature.
|Pressure range||0-100 PSI|
|Sample size||Diameter: 10mm to 50mm|
Thickness: up to 30mm
|Sample geometries||Sheets, Tubes, Hollow fiber, etc.|
|Pressurized gas||Clean, dry, and non-corrosive gas (N2, Oxygen, AIR…)|
|Pressure measurement||Pressure Transducer: 0-10 torr, 0-100 psi|
Resolution: 0.000017 ; Accuracy: 0.15% of reading
|Flow rate||As low as 10-4 cc/s|
|Vacuum ability: 0.002 Torr|
|Vacuum system||Automatic, Regulation system: 0-100 psi|
|Temperature range||Room temperature|
|Temperature control system||Option, 0-80°C|
|Sample chamber||Single chamber design, Stainless steel material|
|Sample chamber size||Ø 99mm X 60mm (T)|