Application of gas flow sensor in gas chromatograph

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Chromatographic analysis is one of the equipments with rapid development, active research and application in the field of instrumental analysis. Since chromatographic analysis can continuously concentrate, separate, purify and measure samples, it has become a commonly used analysis and detection method for every analyst, and has been widely used in various industries such as petroleum, chemical industry, food, medicine, health, metallurgy, geology, agriculture, environmental protection...

It can be said that chromatographic analysis is used wherever there is an analysis task.

 

 

Gas chromatograph refers to a chromatographic analysis instrument that uses gas as a mobile phase, which mainly consists of an analysis unit and a display unit. The former mainly includes a gas source and a metering control device, a sample injection device, a thermostat and a chromatographic column. The latter mainly includes a calibrator and an automatic recorder.

The principle of gas chromatograph is mainly to separate the mixture by using the differences in the boiling point, polarity and adsorption properties of the substance. The working process is mainly that the carrier gas carries the sample into the vaporization chamber. If it is a liquid sample, the coil in the vaporization chamber needs to be heated, and if it is a gas sample, no heating is required. After that, the carrier gas carries the gas sample through the chromatographic column. The chromatographic column contains solid substances with different adsorption forces on different components of the sample gas, which are called stationary phases. After passing through the chromatographic column, the different components of the gas sample are separated and finally enter the detector for analysis to obtain a chromatographic image of the gas sample. Therefore, in the analysis project, gas flow sensors and temperature sensors are required to control the flow rate of the gas and the temperature of the detection to ensure the reliability of analysis and detection.

The figure below shows the structure of the gas chromatograph. It is mainly composed of: gas path system, injection system, column system, detection system, data recording and processing system. It can be seen that the initial gas path system is the key point in the entire gas chromatograph structure, which ensures the smooth operation of the subsequent system:

 

The gas, combustion-supporting gas and auxiliary gas required by the detector, the quality of the gas control system will directly affect the separation efficiency, sensitivity and stability of the instrument, and thus will directly affect the accuracy of qualitative and quantitative analysis. The gas control system is mainly composed of switch valves, stabilizing valves, needle valves, pressure gauges, electronic flow meters and other components. The gas flow sensor can accurately control the carrier gas flow in this part to ensure the working stability of the gas chromatograph.

S3000 gas flow sensor launched by Jinan Rainbow Technology has the following advantages,

 

  • High accuracy (±1.5%F.S);
  • Linear output and no temperature compensation required, maintaining long-term stability with minimal zero drift;
  • Solid-state sensor core (no surface voids or fragile membranes), resistant to blockage and pressure shock;
  • Analog voltage output (1-5V) (I2C digital output, RS485 communication can also be provided);
  • Fast response time (65 ms response time), 9ms can also be selected;
  • Wide flow range: 0sccm-3000sccm;
  • Can be adapted to relatively humid gas measurement;

 

2024/11/06 16:07
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