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Adding Relative Humidity to Trace Concentration Gas Standards In a Permeation System
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From Kin-Tek Laboratories Inc.
Gas sensor sensitivity levels have increased in equipment where atmospheric conditions, such as relative humidity, directly affect test results. Calibrating for changes in relative humidity in trace level gas concentrations has generated the need for effectively adding relative humidity to the output gas of a permeation system. There are several techniques available for adding known levels of humidity to pure gas streams, but those techniques do not directly apply to the dynamics of a permeation system. Specific factors have to be considered for controlling broad ranges of relative humidity in varying dilution gas streams without compromising the concentration of other analytes in the output of the permeation system. Relative humidity can be added to the calibration gas stream without affecting the final concentration requirement by incorporating a module that utilizes a split-flow technique with variable pressure control and variable flow control. This module can be used in different permeation system scenarios or bypassed when a dry calibration gas is needed. Product Announcements
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S.IPSALE
FINE Permeation Tubes, Messina, ITALY
N.DONATO
Dept. of Matter Physics and Advanced Technologies and INFM, University of Messina, ITALY
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