A gas chromatograph detector

Abstract

The invention discloses a gas chromatography detector, which comprises components such as a heating block, a gas pipe, a reference filler, a temperature measuring element, a catalyst filler, a heat insulating layer, a cavity, and a signal processing system. Using air as the carrier gas and make-up gas, the effluent of the chromatographic system is driven by the carrier gas to quickly pass through the reference packing and the catalyst packing in sequence. The catalytic combustion of the effluent releases heat to increase the temperature of the catalyst packing, and the temperature change is converted by the temperature measuring element. output as an electrical signal. The detector can be used to construct a general-purpose detector or a selective detector by changing the chemical properties of the catalyst filler. The detector has the characteristics of high sensitivity and fast response, and can be used for the detection of volatile organic compounds and combustible inorganic gases.

Description

technical field [0001] The invention relates to the field of measurement and detection, in particular to a gas chromatography detector based on the principle of catalytic combustion, which can be used for the detection of volatile organic compounds and combustible inorganic gases. Background technique [0002] The gas chromatographic detector is the key device of the gas chromatograph, which directly determines the important analytical performance such as the sensitivity and linear range of the gas chromatographic analysis. Currently, commonly used gas chromatographic detectors include thermal conductivity cell detector (TCD), electron capture detector (ECD), flame ionization detector (FID), flame photometric detector (FPD) and flame thermionic detector (FTD). )wait. [0003] TCD usually uses hydrogen and helium as carrier gas, while FID and FPD use hydrogen, nitrogen, argon or helium as carrier gas, hydrogen as combustion gas, air or oxygen as supporting gas. ECD typicall...

AI Technical Summary

Problems solved by technology

Because the catalyst is sintered on the surface of the thermistor to form catalytic beads, the gas to be measured reacts on the surface of the catalyst, but the temperature measuring element is located inside the catalyst, so the temperature measuring element cannot reflect the temperature rise caused by catalytic combustion in a true and timely manner. The response time of the sensor is longer and the sensitivity is lower

Therefore, the catalytic combustion detection method of this structure still cannot meet the needs of gas chromatography detection.

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