SU1278700A1 - Device for preparing samples of vapour-gas mixture in equilibrium - Google Patents

Abstract

The invention relates to analytical instrumentation and can be used in the calibration of sensors gas analyzers. The aim of the invention is to increase the reproducibility of calibration in the course of repeated sampling by reducing the analyte loss. This is achieved by addition of a two-position switch and a flow booster in the device. The six-way dosing valve is filled with three symmetrically arranged metering loops arranged crane rotor. These loops are arranged in such a way that in any position one of them forms a circulation contour with a mixing tank and a booster, a second is connected to a source C /) of carrier gas and a chromatographic column, and a third to a source of the analyzed gas and the atmosphere. I il. to 00

Description

The invention relates to analytical instrumentation and can be used in the calibration of gas analyzers and gas chromatographs.

The aim of the invention is to reduce the loss of the substance being analyzed and to increase the reproducibility of the calibration with repeated sampling.

The drawing shows the scheme of the proposed device

The scheme contains a tank-mixer 1 with the analyte, a gas flow booster 2, a two-position switch 3, a metering valve 4 with three dosage loops j line 5, a chromatographic column 6 with a detector 7, a source 8 of the analyzed gas with a flow regulator 9 and thermostat 0.

The device works in the following way,

A solid or liquid volatile analyte is placed into the mixing tank 1, the leads are sealed, the two-position valve 3 is set to the position corresponding to the dotted lines in the drawing for analyzing gas. The source 8 of the analyzed gas is connected through the flow regulator 9 With a gas supply line for analysis into the tank-mixer 1. The gas passes through the flow regulator 9, the gas flow booster 2 (for example, a microcompressor), the tank-mixer 1, where it is saturated with volatile matter and through line 5 enters the dosing loop sampler located in the Lapping A on the rotor of the six-way metering valve A,

Then, the gas through the second dashed channel of the double-ended valve 3 enters the second metering loop, which is in position B of the metering valve 4, which communicates with the atmosphere of the second KomJiOM. After filling the circulation sys: with the analyzed gas, the on-off valve 3 is turned to the position shown in the drawing by solid lines. At the same time, the gas for analysis passes through the metering loop, attained at position 8, to the atmosphere j and in a closed loop, 2.3, A, 5, an equilibrium vapor-gas mixture circulates. Include thermostat 10,

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the microprocessor 2 and through the metering loop in position B start feeding the carrier gas to the chromatographic column 6,

After the operating temperature in the device is established, the chromatograph will start operating mode. Steam-gas, the mixture is constantly circulating through the metering loop, in position A, Dp of sample introduction into the chromatographic column 6, turn the rotor of the crane-dispenser 4 clockwise on | 60, with this metering, the loop with the mixture goes to position B, the second loop from position B goes to position 8, and a third from position 8 goes to position L.- In this position of the crane-dispenser 4, the sample of the gas-vapor mixture is forced by the carrier gas from the metering loop to the chromatographic column b and analyzed by the detector 7. Simultaneously enno metering loop, connection to the circulation system, is filled with a sample gas mixture, and a corresponding amount of gas-for assay passes therefrom into the circulation circuit device, and a third metering loop purged gas for analysis.

After completing the measurement (analysis) of this sample, turning the metering valve 4 by another 60 °, a new portion of the mixture is analyzed, further sampling, purging of another metering unit and sample delivery to the chromatographic column are carried out simultaneously. - or additional manipulations by the operator.

Claims (1)

The invention relates to analytical instrumentation and can be used in the calibration of sensors of gas analyzers and gas chromatographs. The aim of the invention is to reduce the loss of the analyte and to increase the reproducibility of calibration with repeated sampling. The drawing shows the scheme of the proposed device, the Scheme contains a tank-mixer 1 with the analyte, a gas flow booster 2, a two-position switch 3, a metering valve 4 with three metering js 5 line 5, a chromatographic column 6 with a detector 7, the source 8 of the analyzed gas flow regulator 9 and thermostat 0. The device works as follows, a solid or liquid volatile analyte is placed in the mixing tank 1, the D-filling terminals of the system are sealed with an gas for analyzing the two-position Crane 3 is set to the position corresponding to the dotted lines in the drawing. At the same time, source 8 of the analyzed ha. through the flow regulator 9 is connected to the gas supply line for analysis into the tank-mixer 1. The gas passes through the flow controller 9, the gas flow booster 2 (for example, a microcompressor), the tank-mixer 1, where it is saturated with volatile matter and through the line 5 enters the metering loop sampler located in the position of A on the rotor of the six-way metering valve A; Next, the gas passes through the second channel of the two-pin valve 3, indicated by a dotted line, to the second metering loop located in position B of the metering valve 4, .connected a second KomJiOM atmosphere. After filling the circulation sys: with the analyzed gas, the on-off valve 3 is turned to the position shown in the drawing by solid lines. At the same time, the gas for analysis passes through the metering loop, AT A GLANCE at position 8, into the atmosphere j and in a closed circuit, 2, 3, A, 5 an equilibrium vapor-gas mixture circulates. The thermostat 10 is turned on, the microprocessor 2 and through the dosing loop in position B, feed the carrier gas to the chromatographic column 6. After the operating temperature is established in the device and the chromatograph starts working on the operating mode. Steam-gas, the mixture is constantly circulating through the metering loop in position A, after the sample is introduced into the chromatographic column 6, the rotor of the crane 4 is turned clockwise by 60, with this metering, the loop with the mixture goes to position B, the second loop from position B goes to position 8, and a third from position 8 goes to position L.- In this position of the metering valve 4, the sample of the gas-vapor mixture is pushed by carrier gas from the metering loop into the chromatographic column b and analyzed by detector 7. Simultaneously but metering loop, connection to the circulation system, is filled with a sample gas mixture, and a corresponding amount of gas-for assay passes therefrom into the circulation circuit device, and a third metering loop purged gas for analysis. After completing the measurement (analysis) of this sample, turning the crane doser 4 by another 60 °, the lysis of the new portion of the mixture is carried out, while further sampling, blowing of another dosing unit, the sample is supplied to the chromatographic column simultaneously without any additional manipulations hand operator. The invention The device for sampling an equilibrium vapor-gas mixture, including a tank-mixer with an analyte, equipped with a flow regulator line connecting the specified tank-mixer with the source of the analyzed gas, the line connection1 {I feel the output of the tank-mixer with a six-way valve a metering device with a rotor and a stator and a metering loop, the INPUT, which is connected to the source of the gas carrier, and one of the outputs is a chromatographic column, characterized in that, in order to increase the reproducibility calibration with repeated sampling by reducing the loss of the analyte, it is additionally equipped with a two-position switch and a flow rate booster, the six-way dosing valve is additionally equipped with two metering loops equal in volume to the first metering loop, all the loops are located in the rotor, one metering loop, the tank-mixer and the gas flow booster form a circulation loop, the second is connected to a source of carrier gas and a chromatographic column, a third is connected to a source m analyzed through a two-position switch and with: the atmosphere.