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Miniature sample gas automatic sample injection system for gas chromatography

A technology of automatic sampling and gas chromatography, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems that the test results cannot be guaranteed to be accurate and reliable, can not meet the gas chromatography detection, and the volume is inconsistent, so as to achieve accurate and reliable test results and low cost. Low, the effect of improving accuracy

Pending Publication Date: 2020-06-02
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the commonly used gas sampling systems mostly use fixed gas samplers, and most of them are atmospheric pressure sampling. There is no set of automatic sampling that can be used for normal pressure sampling, positive pressure sampling, and vacuum sampling for micro samples. The system cannot meet the requirements of gas chromatography detection under different conditions
The existing technical means cannot control the pressure, so that the gas volume of the standard gas entering the quantitative loop of the gas chromatograph is inconsistent with the gas volume of the measured gas, so that the test results cannot be guaranteed to be accurate and reliable

Method used

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  • Miniature sample gas automatic sample injection system for gas chromatography
  • Miniature sample gas automatic sample injection system for gas chromatography
  • Miniature sample gas automatic sample injection system for gas chromatography

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 As shown, it is used for gas chromatography sample gas miniature automatic sampling system, including filter 1, fine-tuning valve 2, first solenoid valve 3, valve mechanism 4, pressure sensor 5, first flow path 6, second flow path 7, Second solenoid valve 8, gas outlet pipe 9, temperature sensor 11, six-way valve 10, fourth solenoid valve 12, motor 13, third solenoid valve 14, vacuum pump 15 and automatic controller. Among them, the filter 1 is used to access the gas and filter out the impurity particles in the gas; the fine-tuning valve 2 is connected to the filter 1 pipeline, which is used to control the opening of the pipeline and can adjust the sampling speed; the first solenoid valve 3 It is connected with the fine-tuning valve 2 pipeline to control the opening and closing of the pipeline; the valve-through mechanism 4 is connected with the pipeline of the first electromagnetic valve 3 and connected with an external detection mechanism (such as: a ...

Embodiment 2

[0029] The following are the test results of atmospheric pressure injection.

[0030] Under normal working conditions, connect the filter 1 to the air intake pipeline. After the instrument is stabilized, when the first solenoid valve 3, the second solenoid valve 8, the fourth solenoid valve 12 and the third solenoid valve 14 are in the closed state, Open the filter 1, the first solenoid valve 3, the fourth solenoid valve 12 and the second solenoid valve 8, the automatic controller controls the motor 13 to start, and turn off the motor after 20 seconds of sample injection, and after the gas atmosphere is balanced, close the first solenoid valve in turn 3. The second solenoid valve 8 and the fourth solenoid valve 12, the automatic controller controls the rotation of the six-way valve 10, starts the chromatographic sample injection analysis and detection, repeats the measurement 8 times, and the detection results are shown in Table 1.

[0031] Table 1 Continuous injection of 8 ti...

Embodiment 3

[0035] The following are the test results of positive pressure injection.

[0036] Under normal working conditions, filter 1 with H 2 After the instrument is stabilized, the first solenoid valve 3 and the fourth solenoid valve 12 are closed, and the automatic controller opens the filter 1, the third solenoid valve 14, the second solenoid valve 8, and the pressure sensor 5 and vacuum pump 15, so that the vacuum pump 15 extracts the gas in the system. After the pressure displayed by the pressure sensor 5 reaches the specified pressure, the automatic controller opens the first electromagnetic valve 3 and the filter 1, and the automatic controller controls the fine-tuning valve 2 to control the pipeline. opening, and then adjust the injection speed, the automatic controller controls the rotation of the six-way valve 10, adjusts the sample gas with different injection volumes, starts the chromatographic sample injection analysis and detection, and records the chromatographic peak r...

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Abstract

The invention discloses a miniature sample gas automatic sample injection system for gas chromatography. The system comprises a filter, a micro-metering valve which is connected with the filter through a pipe, a first electromagnetic valve which is connected with the fine adjustment valve through a pipe, a valve opening mechanism which is connected with the first electromagnetic valve through a pipe and is connected with an external detection mechanism, a pressure sensor which is connected with the through valve mechanism through a pipe, a first flow path and a second flow path which are connected with the pressure sensor; a second solenoid valve connected to the first flow path, a gas outlet pipe which is connected with the second electromagnetic valve through a pipe, a temperature sensorwhich is connected between the through valve mechanism and the pressure sensor, and an automatic controller which is electrically connected with the micro-metering valve , the first electromagnetic valve, the through valve mechanism, the pressure sensor, the second flow path, the first flow path, the second electromagnetic valve and the temperature sensor. According to the invention, through positive pressure, negative pressure and normal pressure sample injection, the tested gas entering the quantitative loop of the gas chromatograph meets the analysis requirements of different sample quantities in different working conditions, and the test result is accurate and reliable.

Description

technical field [0001] The invention relates to the field of detection instruments, in particular to a miniature sample gas automatic sampling system for gas chromatography. Background technique [0002] The role of the chromatographic sampling system is to introduce the sample directly or after special treatment into the gasification chamber or chromatographic column of the gas chromatograph for analysis, and can be divided into different types according to different functions. Among them, the gas sampling system is used to introduce gas samples into the gas chromatograph. [0003] At present, the commonly used gas sampling systems mostly use fixed gas samplers, and most of them are atmospheric pressure sampling. There is no set of automatic sampling that can be used for normal pressure sampling, positive pressure sampling, and vacuum sampling for micro samples. The system cannot meet the requirements of gas chromatography detection under different conditions. Existing te...

Claims

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Application Information

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IPC IPC(8): G01N30/24
CPCG01N30/24
Inventor 安永涛张志陈俊光姜飞胡俊陈军陈克琳
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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