GAS CHROMATOGRAPH SAMPLER Russian patent published in 1995 - IPC

FIELD: measurement technology; chromatography. SUBSTANCE: device has gas carrier supply line, analyzed gas supply line, pneumatic signal line. To switch cocks, pneumatic unit P1M4 belonging to a complex system of pneumoautomatic members and units, external dose, column, air relay, electropneumatic transducer. Pneumatic unit P1M4 has four autonomous pneumatic valves being three-way two- positioned cocks having the property of connectability of two of the ways depending on presence or absence of control signal. The first way of the first valve and the first way of the fourth valve in the integrated pneumatic unit P1M4 are connected with the gas carrier line, the first way of the second valve is connected with the analyzed gas line, the second way of the first valve is connected with discharge line, the second way of the second valve and first way of third valve are connected with each other, the second ways of third and fourth valves are sealed, the third ways of the third and fourth valves are connected with each other and with column, the external dose is located between the third way of the first valve and the third way of the second valve, control inlets of the second and fourth valves are connected with pneumatic signal supply line, those of the first and third valves go out into atmosphere in "analysis" mode of operation, control inlets of the first and third valves are connected with pneumatic signal supply line and those of the second and fourth valves go out into atmosphere in "sampling" mode of operation. Hydrodynamic resistance of the column is equal to 0.04-1.0 mPa. EFFECT: enhanced effectiveness of operation. 2 cl, 2 dwg