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A gas chromatography fid automatic ignition detection control method

An automatic ignition, detection and control technology, applied in the field of gas chromatography detection, can solve the problems of ignition failure, error-prone, machine damage, etc., achieve the effect of simple use process and lower skill requirements

Active Publication Date: 2016-05-11
上海仪电分析仪器有限公司
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AI Technical Summary

Problems solved by technology

[0005] (1) There are bound to be many uncertainties in the manual control of ignition conditions. If any one of the conditions is not properly controlled, it will lead to ignition failure and may even cause damage to the machine;
[0006] (2) Manually confirming whether the ignition has been properly ignited has potential safety hazards, and it will also take a lot of time. In short, it is easy to make mistakes and the work is cumbersome

Method used

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Embodiment Construction

[0018] The prerequisite for the realization of the present invention is that the gas chromatograph must have the electronic flow control technology of the gas circuit system, a temperature control system, an ignition device and a signal detector.

[0019] Before automatic ignition, three major parts of the system must be detected: first, the injector part, including the injector temperature, the carrier gas flow rate in the injector, etc.; second, the column oven part, mainly whether the column oven temperature is normal; , the detector part, including the temperature of the detector, the flow rate of each auxiliary gas of the detector, etc.

[0020] First, confirm whether the user needs automatic ignition. If automatic ignition is required, the system will automatically enter the automatic ignition mode after the self-test is completed. Make sure that there is no air leakage in each gas system. If there is any air leakage, the instrument will automatically alarm during the co...

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Abstract

The invention discloses an automatic ignition detection control method of a gas chromatography flame ionization detector (FID). The method comprises the following steps: starting a self-check program, performing self-check on an FID, a sampler and a column box; transmitting an ignition command, starting an FID ignition program; determining which path of FID needs to be ignited, and then judging whether air flow is smaller than the set internal air flow; if the air flow is smaller than the set internal air flow, igniting, if the air flow is not smaller than the set internal air flow, setting the sensitivity of the FID as 10<10>, setting the hydrogen flow increment, and judging whether the signal change of the FID is greater than 0.5mv; and if the signal change is greater than 0.5mv, judging successful ignition of the FID, if the signal change is not greater than 0.5mv, setting the hydrogen flow as a first ignition flow value, setting the air flow as a second ignition flow value, setting the tail blowing flow as a third ignition flow value, and then carrying out the ignition.

Description

technical field [0001] The invention belongs to the technical field of gas chromatography detection, in particular to a gas chromatography FID automatic ignition detection control method. Background technique [0002] Hydrogen flame ionization detector or flame ionization detector (flameionization detector, FID) is one of the most commonly used detectors in gas chromatography. Its outstanding advantages are high sensitivity, wide linear range, and detection of almost all organic substances. response. It has reliable performance, simple structure, convenient operation, and its dead volume is almost zero. FID has been widely used no matter in the past packed column period, or capillary column has been popularized, and it is developing into comprehensive two-dimensional and fast gas chromatography today. [0003] For the flame ionization detector FID, whether the ignition step can be successfully completed is the prerequisite for the normal operation of the FID detector. In ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/68
Inventor 黄华赵聪聪何国琛
Owner 上海仪电分析仪器有限公司
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