Chromatographic column temperature control circuit

Abstract

The invention relates to a chromatographic column temperature control circuit which comprises a heating module for heating a chromatographic column, a temperature measurement module for measuring the current temperature of the chromatographic column, and a main control module for obtaining the current temperature of the chromatographic column from the temperature measurement module, wherein when the current temperature is first temperature, low-temperature constant-temperature regulation is performed; when the current temperature is second temperature, high-temperature constant-temperature regulation is performed; and when the current temperature is between the first temperature and the second temperature, programmed temperature rise regulation is performed. According to the chromatographic column temperature control circuit, continuous voltage heating is applied to the chromatographic column, so that rapid linear temperature rise and low and high-temperature control are realized, the analysis time is shortened, the heating power consumption is reduced, and on-site analysis and detection of a gas chromatograph are realized.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a chromatographic column temperature control circuit. Background technique [0002] Gas chromatography is a common type of chromatography used to separate and analyze compounds that can evaporate without decomposing, and is used in analytical chemistry to analyze mixtures. During use, the carrier gas pushes the vaporized sample in the inlet into the chromatographic column, and the temperature of the chromatographic column is programmed to increase the resolution of the sample, and reduce the noise in the chromatogram. [0003] According to the length of the chromatographic column, the temperature control method of the chromatographic column can be divided into direct heating and indirect heating. For example, the chromatographic column heating method invented in Patent Application No. 201310754095.1 is to heat the aluminum ingot, and then use a fan to transfer the heat to the ...

AI Technical Summary

Problems solved by technology

Affects the performance of the gas chromatograph

It is reflected in unstable retention time, messy chromatogram, and deformed peaks

Secondly, the temperature rise rate of the above devices is relatively slow, which is not suitable for rapid analysis and trace detection

Third, the pulse heating method will cause the voltage applied across the column to be discontinuous, resulting in uneven column temperature

Fourth, the device is assembled from multiple instruments without system integration and automatic control, and is not suitable for portable instruments

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