Application Note 061
Diffusion-locking is a patented technology for thermal desorption developed by Markes International. It keeps sample tubes sealed at ambient pressures, but allows gas to flow through the tubes whenever pressure is applied.
Diffusion-locking does not involve any kind of valve or other moving parts, and is thus inherently simple and robust.
This application note provides a detailed description of the principles of diffusion locking, and how it can be applied to enhance both sorbent tube sampling and the automation of analytical thermal desorption.