Gas Diffusion Permeameter

Model: GDP-V1

  • The Gas Diffusion Permeameter is used to determine the transport of various gases through membrane-like materials under a wide range of static and dynamic conditions.
  • The instrument is equipped with a high-vacuum vacuum pump to detect very low gas permeability.
  • Various shapes of samples can be tested: flat sheet, hollow fiber, tube…

In order to detect extremely low gas transmission rates through a sample, it is necessary to abandon direct flow measurement because flow meters are not very accurate. Diffusion Permeameters determine the low gas flow rates indirectly by measuring time rate of change of pressure on the outlet side.


The sample was loaded in the sample chamber which divides in two chambers. One chamber is on the inlet side of the sample and the other is on the outlet side of the chamber. The exact volume of outlet chamber is determined. The chambers on both sides of the sample are evacuated. Then a quantity of test gas is introduced to the chamber on the inlet side of the sample, its pressure is kept almost constant, and the pressure is monitored on both sides of the sample. The two pressures are recorded as functions of time. The data are used to compute transmission rate. In order to obtain the utmost accuracy, the system is maintained at a constant temperature.


Model GDP-V1
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
Pressure regulation control system Automatic, Regulation system: 0-100 psi
Vacuum system Vacuum ability: 0.002 Torr
Temperature range Room temperature
Temperature control system Option, 0-80℃
Sample chamber Single chamber design, Stainless steel material
Sample chamber size Ø 99mm X 60mm (T)
  • USB communication and suit for Windows 7/8/10
  • Operation type: with automatic test mode and manual control mode
  • Auto-test has test requirement scope setting
  • Calibration and adjustment function
  • Auto-test parameter setting

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