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The 3500 Organic Vapour monitor uses a single wafer of charcoal sorbent for collecting organic vapours.
The 3520 Organic Vapour Monitor uses two wafers of charcoal sorbent for collecting organic vapours. Suited for compounds at unknown concentrations where the capacity of the 3500 monitor may be exceeded.
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3M™ Organic Vapour Monitor 3500
The 3M™ Organic Vapour Monitor 3500 uses a single charcoal sorbent wafer for collecting organic vapours.
3M™ Organic Vapour Monitor 3520, with Backup Section
The 3M™ Organic Vapour Monitor 3520, with Backup Section is suited for compounds for which activated carbon shows limited capacity.
