Personal low-flow air samplers ideal for sorbent tube collection of gases and vapors (18-556V and 18-556W sorbent tubes sold separately). Feature two modes of operation: constant- flow mode (5 to 200cc/min.) for single-tube sampling and constant-pressure mode (1 to 350cc/min.) for multiple-tube sampling. Instant fault function automatically stops internal pump when sampler is operated outside its performance envelope. EMI/RFI shielding case protects instrument from electromagnetic and radio-frequency interference.
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