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Chromatographic photoionization detector

A photoionization and detector technology, applied in the field of chromatographic photoionization detectors, can solve the problems of low reliability and sensitivity, and achieve the effects of improving sensitivity, reducing adhesion, and improving use efficiency

Inactive Publication Date: 2011-05-25
上海仪电分析仪器有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] When used in gas chromatography, it can solve the problem of low reliability and sensitivity of chromatographic photoionization detectors currently used in gas chromatography detection

Method used

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Embodiment 1

[0035] Example 1, such as figure 1 As shown, the main body of the entire chromatographic photoionization detector is cylindrical, and the external physical dimensions are φ27mm in diameter and 81mm in height. The chromatographic column is connected through the chromatographic connecting column 2. In order to prevent the sample peak from broadening or tailing, a makeup interface 3 is designed on the chromatographic connecting column. The nozzle 4 and the electrode are integrated and embedded in the PID ionization chamber 5 , connected through the probe and the collector joint 14 to realize voltage transmission and signal collection. The volume of the PID ionization chamber is 35μL. There are two gas paths in the PID ionization chamber. One is the exhaust port 6, through which all residual gas is exhausted. The other is the curtain air inlet 7. During use, it can be directly Purging and cleaning the window of the ultraviolet lamp reduces the adhesion of residual samples to the ...

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Abstract

The invention relates to a chromatographic photoionization detector which comprises a tail blowing connector and a nozzle, wherein the tail blowing connector is arranged on a chromatographic connecting column connected with a chromatographic column and used for preventing the peak of a sample curve to be detected from widening or trailing; the nozzle is embedded into an ionization chamber and taken as an electrode to be connected with a collector connector through a probe to realize transmission and acquisition of voltage signals; the ionization chamber is provided with two air passages, wherein one is an exhaust port through which the residual gas in the detecting course is exhausted, and the other one is a curtain exhaust port and is used for blowing and cleaning the window of an ultraviolet lamp in the detecting course; the ionization chamber is connected with the fixed sleeve of the lamp through screw threads; the fixed sleeve of the lamp is tightly pressed with a lamp pressing sleeve embedded with the base of the ultraviolet lamp; the protective cover of the lamp is tightly pressed and sheathed with the ultraviolet lamp through the pressing spring of the lamp; and the ultraviolet lamp activates a voltage lead joint to be fixedly connected to the protective cover of the lamp through a tacking nut. The chromatographic photoionization detector improves the insufficient design of the conventional chromatographic photoionization detector and enhances the sensitivity, selectivity and stability of a PID (Proportion Integration Differentiation) detector.

Description

technical field [0001] The invention belongs to the technical field of analytical instruments, in particular to a chromatographic photoionization detector. Background technique [0002] Chromatography Photo Ionization Detector (PID for short) is one of the commonly used gas chromatographic detectors that has developed rapidly in the past 20 years. It uses light radiation to ionize the measured components and generate signals. Its sensitivity is 100-1000 times higher than FID, especially for aromatic and unsaturated compounds. Selectivity varies by light source. There have been many reports on the development and application of PID in my country. The traditional PID detector, the nozzle and the electrode are designed separately, and the structure is complicated; the excitation voltage of the ultraviolet lamp is generally rigidly connected, which has poor contact and low reliability; the base of the ultraviolet lamp is fixed. The spring is used to compress, and the sealing i...

Claims

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Application Information

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IPC IPC(8): G01N30/74G01N27/64
Inventor 王海龙药树栋鲍春孙圣坤赵国鑫孟宗保曹秀君赵聪聪
Owner 上海仪电分析仪器有限公司
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