Automatic calibration method and device

Abstract

The invention relates to an automatic calibration method. The method comprises the following steps of: a, introducing a gas sample into an analytical instrument and continuously analyzing the gas sample; b, when calibration is needed, switching a gas flow path to a calibration flow path by a control unit, controlling the flow of standard gas and diluent gas by the control unit, preparing calibration gas with specified concentration, and introducing calibration gas into the analytical instrument to obtain calibration data; and generating a new calibration result according to the calibration data; and c, switching the gas flow path to a gas sample flow path by the control unit, and continuously analyzing the gas sample by using the new calibration result until calibration is needed. The invention also provides an automatic calibration device. The invention has the advantages that: a dilution ratio range is wide, the volume is small, remote control and automatic calibration can be realized and the like.

Description

technical field [0001] The invention relates to an automatic calibration method and device, in particular to an automatic calibration method and device applied in the field of chromatography. Background technique [0002] On-line chromatographic analyzers used for environmental monitoring usually use the external standard calibration method for quantitative analysis of analytes, that is, before measuring the actual sample, first analyze the signal value of each component to be measured in the standard gas with known concentration, and then use this The signal value and the ratio of the measured component to the standard gas concentration are used as the conversion factor in the quantitative analysis. [0003] Usually, after this type of instrument has been in operation for a long time, due to changes in environmental conditions and detector response attenuation, the signal value of the instrument for the same concentration of gas will drift, which will seriously affect the a...

AI Technical Summary

Problems solved by technology

[0009] 1. Low degree of automation and difficulty in miniaturization of instruments

[0010] Since the dynamic calibrator and the chromatographic analyzer are two sets of instruments, the preparation of gases at various concentration levels, the control of the path between the dynamic calibrator and the chromatographic analyzer, and the generation of the final calibration curve all require manual operations, and the steps are cumbersome. Remote control and automated calibration are difficult;

[0011] The calibrator is bulky and difficult to miniaturize;

[0012] 2. The range of dilution ratio is small, and the cost of use and maintenance is high

[0013] The flow rate range of the flowmeter equipped with the dynamic calibrator itself is limited, resulting in a limited range of the dilution ratio between the dilution gas and the standard gas; in order to obtain a high-concentration calibration gas, it is necessary to use a larger standard gas flow rate, so that the standard gas consumption is fast ; or when the flow rate is set according to the demand, the fixed configuration of the dynamic calibrator cannot reach the required flow rate, so that the calibration cannot be carried out as expected; to achieve the calibration of a large dilution ratio range, the flow meter needs to be replaced frequently, resulting in high use and maintenance costs ;

[0014] 3. It is difficult to carry out personalized design for each chromatographic analyzer

[0015] Since different chromatographic analyzers are suitable for different occasions, the dilution ratio ranges are different when calibrating the corresponding chromatographic analyzers, so that the use of one dynamic calibrator cannot meet the calibration requirements of multiple chromatographic analyzers at the same time; thus making each It is difficult to personalize the design of a chromatographic analyzer

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