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Diffusion caps are usually made of clear anodised aluminium. However, they can also be supplied in stainless steel for use in more corrosive atmospheres if required (contact Markes for this option).
For traceability purposes, diffusion caps may also be supplied etched with a unique serial number (contact Markes for this option).
The diffusion cap replaces the storage cap at the sampling (grooved) end of the TD sample tube for the duration of the exposure/monitoring period. The storage cap at the other end of the tube is left in place.
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