Gas-passage change-over apparatus

Details Gas-passage change-over apparatus Gas-passage change-over apparatus

1987-12-18

1989-09-05

Schor, Kenneth M.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Flame ionization detector

73 23, 422 52, 422 93, 436158, 436172, G01N 3100, G01N 2100

Patent

active

048636916

ABSTRACT:
A gas-passage change-over apparatus, in which two gas lines are connected to one detector so that either of the two gas lines may be opened into the detector under the condition that the pressures at the ends of the two gas lines having different volumes are regulated by a pressure regulator. Switching valves are provided in each of the gas lines, and the connection of the flow from the gas lines to the detector is changed over by means of the two switching valves, such that switching valves are both closed for a predetermined period of time between changeovers.

REFERENCES:
patent: 3224838 (1965-12-01), Evans
patent: 3667914 (1972-06-01), Penguite
patent: 3765247 (1973-10-01), Riggs
patent: 3963928 (1976-06-01), Zolner
patent: 4520651 (1985-06-01), Litman
patent: 4555931 (1985-12-01), Amimoto

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