Diffusion tubes have been used for years as an inexpensive,
do-it-yourself solution to blend trace concentration gas mixtures
for common solvents. Typical diffusion tubes have a glass reservoir attached to
the end of a precision bore capillary tube. Solvent liquid is injected into the
reservoir through the capillary bore. Solvent emission is controlled by
diffusive flow through the capillary and adjusted by choice of capillary bore,
length, and operating temperature.
Kin-Tek Laboratories Inc.'s Trace Source configurable
diffusion tubes extend the range of compounds that can be used to include
subliming solids and viscous liquids. These tubes have a removable reservoir
that allows filling with the capillary removed, so the component compound can
be any consistency. A variety of pre-configured and tested capillaries can be
interchangeably fitted to the reservoir, adjusting the range of concentrations
obtainable.
Kin-Tek Laboratories
Inc., www.kin-tek.com
