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Trigger device and injection trigger method for chromatographic instrument inlet

A technology of triggering device and injection port, applied in measurement devices, instruments, scientific instruments, etc., can solve the problems of poor repeatability of retention time, unsuitable for portable instruments, easy failure of electronic devices, etc., achieving good applicability, reduction and exemption Manual operation steps or complex control system, simple structure effect

Active Publication Date: 2014-10-08
FOCUSED PHOTONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the injection trigger signal of most gas chromatographs needs to be manually triggered by the start button on the instrument. The time interval between each injection and pressing the button is different, which will lead to poor retention time repeatability.
[0003] The Varian gas chromatograph uses an automatic injection trigger device. A long shrapnel is installed on the upper part of the injection port. When the sample is injected, the injection needle presses down the shrapnel to press the micro switch to obtain a trigger signal. Although this method can complete automatic injection triggering, it needs to install some complex connecting rod parts on the injection port, which is bulky, complicated, and easy to damage and fail, so it is not suitable for on-site portable instruments.
The triggering method adopted by TORION is relatively complicated. A custom-made syringe is used to press the probe on the PCBA board, and the probe is in contact with the electrode to trigger the trigger.
This has relatively strict requirements on the type of syringe, and only its specially customized SPME needle can be used to inject samples. The versatility is limited, and the triggering electronic device is very prone to failure under the high temperature of more than 200 degrees in the injection port.

Method used

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  • Trigger device and injection trigger method for chromatographic instrument inlet
  • Trigger device and injection trigger method for chromatographic instrument inlet
  • Trigger device and injection trigger method for chromatographic instrument inlet

Examples

Experimental program
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Effect test

Embodiment 1

[0037] figure 1 , 2 The basic structural diagram of the triggering device of the chromatograph inlet of the embodiment of the present invention is schematically given, as figure 1 , 2 As shown, the trigger device includes:

[0038] Action piece 1, the action piece 1 has a through hole 11 through which the sampling needle passes. When the action piece 1 moves in the limit piece 3, the elastic pieces 2 and 6 are deformed, so that the first electrode 4 , The second electrodes 8 are electrically connected through the action piece 1, such as figure 2 As shown; the action piece 1 is made of conductive material, such as metal.

[0039] Preferably, the lower part of the action member has two rods 12 and 13 for connecting the first electrode and the second electrode, and the rods move within the limiting member 3 . Optionally, the end of the rod has circular trusses 14 , 15 , and the outer diameter of the circular trusses 14 , 15 is larger than the inner diameter of the limiting ...

Embodiment 2

[0052]An application example of the triggering device and the triggering method for the injection port of the chromatograph according to Embodiment 1 of the present invention in the detection of benzene series. In this application example, the upper part of the moving part is a disc, and the center of the disc has a through hole for the passage of the sampling needle, and the lower part has two semicircular rings. The elastic part adopts a spring, and the spring is located between the action part and the sample inlet, and an insulating seat is arranged at the bottom of the spring, and the insulating seat is arranged on the sample inlet. The moving part is made of copper, and the limit part is made of insulating plastic.

[0053] The operation mode of the above trigger (i.e. sample injection trigger method) is:

[0054] (A1) Insert the sampling needle into the through hole of the action piece, and press down the action piece by hand;

[0055] (A2) The two semi-circular rings ...

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Abstract

The invention provides a triggering method for a sample injection port of a chromatograph, which includes the following steps: (A1) inserting the needle head of an SPME into the through hole of an acting piece and pressing downward the acting piece; (A2) enabling the acting piece to move in a limiting piece and connect with a first electrode and a second electrode after an elastic piece is deformed, as a result, the first and the second electrodes are communicated through the acting piece, so as to trigger the working of the sample injection port; and (A3) lifting the external force so as to enable the acting piece to restore to the original position under the action of the elastic piece. The triggering device and method have the advantages of simple structure and high stability, portability and universality.

Description

technical field [0001] The invention relates to a sample inlet of a chromatograph, in particular to a trigger device and a trigger method for a sample inlet of a chromatograph. Background technique [0002] A trigger signal is required to start the instrument to run the process and trigger signal acquisition when gas chromatograph samples are injected. At present, the injection trigger signal of most gas chromatographs needs to manually trigger the start button on the instrument, and the time interval between each injection and pressing the button is different, which will cause the retention time repeatability to deteriorate. [0003] The Varian gas chromatograph uses an automatic injection trigger device. A long shrapnel is installed on the upper part of the injection port. When the sample is injected, the injection needle presses down the shrapnel to press the micro switch to obtain a trigger signal. Although this method can complete automatic injection triggering, it nee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/16
Inventor 邱明胡建坤张斌段炼
Owner FOCUSED PHOTONICS
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