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Using Permeation Tubes to Create Trace Concentration Moisture Standards

From Kin-Tek Laboratories Inc.
 

 

Moisture standards have traditionally been prepared by techniques which saturate the gas at known conditions. Preparing standards at trace concentrations (low ppm, ppb) requires saturation at cryogenic temperatures. Standard techniques require large cumbersome apparatus, and are generally not well suited for field use. Additionally, the method cannot be used with condensable gases frequently of industrial interest.

Permeation tubes can be used to dispense precisely known quantities of moisture. Using permeation tubes to make standard additions of moisture to a flowing gas stream offers a technique which can be used in the field and in a wide range of matrix gases.

This paper discusses the permeation tube method and special techniques needed to use permeation tubes to created trace concentration moisture standards.

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