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Sorbent retaining gauzes are manufactured to critical tolerances to ensure that they correctly fit the front groove of metal (stainless steel/inert coated) tubes.
The placement of the front gauze is critical for diffusive sampling as it defines the diffusion gap. All Markes 3½” metal tubes are supplied with this critical front gauze correctly and firmly fitted.
Gauzes may also be used to separate sorbent beds in metal multi-sorbent tubes. For inert coated tubes, gauzes in contact with the sample stream are also inert coated.
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