SU1308893A1 - Sample metering pump for chromatograph - Google Patents

Abstract

This invention relates to gas analysis and gas chromatographic dispensers. The aim of the invention is to improve the accuracy and speed up the dosing. The sample dispenser is equipped with two chambers with membranes dividing it into two parts. One part of each chamber is in contact with the channels of the gas to be analyzed, and the other is connected with an additionally introduced Nos-1-el gas line connected to the main line. In dosing, due to the presence of membranes, the pressure in the dose is equalized to the pressure in the carrier gas line. 2 Il. e S oo oo 00 co with

Description

The second rod 6 is set to the sample insertion position (FIG. 2). The carrier gas passes through channels 10 and 13, dose 8 and flushes the analyzed mixture through channels 14 and 11 into the chromatographic column.

The proposed device, due to the presence of chambers equipped with membranes, makes it possible to avoid mixing the carrier gas flows and the gas to be analyzed, as well as changing the carrier gas flow rate during the entire sampling and sample introduction operation, which completely eliminates the drift of the zero line of the recorder, increases accuracy of analysis and. reduces the time it is spent.

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The invention relates to gas analysis, and more specifically to dispensers in gas chromatography.

The aim of the invention is to improve the accuracy of the analysis and the acceleration of dosage.

FIG. 1 shows a device for injecting a sample into a gas chromatograph in the Sample Set position; figure 2 - the same, in the position of the input sample.

The device consists of a housing 1 with fittings 2-5, a rod 6 with sealing rings 7, a dose of 8, channels 9-16 for a carrier gas and a sample, two chambers 17 with membranes 18.

A device for introducing a sample into a gas chromatograph works as follows.

The device is installed in the carrier gas line, the latter through the canal 20 of the entire device of whole 1.0 and 11 enters the chromatography and at the flow rate of the carrier gas column. A part of the gas flow through the chromatographic carrier through the switch 19 enters the chambers 17. When the pressures of the carrier gas in the main stream are equal and in the chambers 17, the switch 19 is closed and left in this position for all analyzes.

Under the pressure of the gas nos - O) bodies in the chambers 17 of the membrane 18 are pressed to the ends of the channels 9 and 12,

The rod 6 is set to the Sample Set position (Fig. 1). The analyzed mixture under pressure, above 35 inlet and outlet fittings, anapicizes the pressure of the carrier gas, deflected gas, installed on the membranes 18, flows through the channels 9 of the fitting 2, channel 13 to dose 8; Through channel 14 and channels 12 of nozzle 5, it is discharged into the atmosphere, 40 sa, characterized in that

Then the flow of the analyzed gas that, in order to increase the accuracy and stop. The excess of the analyzed gas, which is in the dose, is discharged into the atmosphere until the pressure of the analyzed gas is compared to 45 Two parts, one of which is connected to the gas pressure in the chambers 17, to the channels of the analyzed gas, and so on. e. with carrier gas pressure. For a friend, with an additional line of gas the membrane 18 overlaps the inlet and the carrier connected to the main outlet of the analyzed gas. After a carrier gas line.

. In addition, the proposed device allows control of the reed switch, since the slightest depressurization or change in the velocity of the carrier gas in the chromatographic column leads to a drift of the zero line of the recorder.

Claims (1)

Invention Formula A sample dispenser in a chromatograph comprising a housing with carrier gas channels connected to a carrier gas line on which the dose is set to opposite the body, and a movable rod with o-rings, located inside the acceleration dosing body, it is equipped with two chambers equipped with membranes separating each chamber into The second rod 6 is set to the sample insertion position (FIG. 2). The carrier gas passes through channels 10 and 13, dose 8 and flushes the analyzed mixture through channels 14 and 11 into the chromatographic column. The proposed device, due to the presence of chambers equipped with membranes, makes it possible to avoid mixing the carrier gas flows and the gas to be analyzed, as well as changing the carrier gas flow rate during the entire sampling and sample introduction operation, which completely eliminates the drift of the zero line of the recorder, improves accuracy analysis and. reduces the time it is spent. of the entire device as a whole and at the flow rate of the carrier gas flowing through the chromatographic . In addition, the proposed device allows monitoring the tightness of the entire device and the flow rate of the carrier gas flowing through the chromatographic system. This is due to the fact that the slightest depressurization or change in the velocity of the carrier gas in the chromatographic column leads to a drift of the zero line of the recorder. Invention Formula the inlet and outlet nozzles of the anapsed gas installed on the ca. A sample dispenser in a chromatograph comprising a housing with carrier gas channels connected to a carrier gas line on which the dose is set to the inlet and outlet nozzles of the anapsed gas installed on the ca. Two parts, one of which is connected to the channels of the analyzed gas, and the other to the additional line of the carrier gas connected to the main line of the gas carrier. speeding up dosing, it is equipped with two chambers equipped with membranes dividing each chamber into 1 AT (Rig, g Editor L. Gratilllo Compiled by I. P1iganov Tehred M. Khodanych 1791/35 Circulation 777 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Proofreader S. Shekmar