Combined with 940b or other preconcentrator, it can realize 8-way / 16-way sampling tank or air bag automatic injection, multi position valve with heating function to avoid condensation influence, and gas path cleaning and gas path leakage detection can be completed by cooperating with pre concentration instrument. The sampling tank or air bag being injected can be identified by indicator light. 8-way (desktop) / 16 way (vertical) is optional
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