In the realms of modern industrial production and scientific research, gas composition analysis acts as a precise 'key' to unlock critical information in complex processes. The online gas chromatography system, with its high efficiency and precision, has become the preferred tool for many enterprises and research institutions. Today, we will delve into the essential ——pre-treatment, a core component of the online gas chromatography system!

Pre-treatment: the "golden starting point" of the analysis process

The analysis journey of the online gas chromatography system begins with sample pretreatment. The importance of the pretreatment process, which converts complex samples into a form suitable for chromatographic analysis, is self-evident.

Pre-treatment of online gas chromatography (GC) analysis is the key link to ensure the accuracy and reliability of the analysis results. In practical application, we may encounter the following problems:

Q：Problem 1: Insufficient representation

If the sample collection is not uniform or representative, the analysis results may deviate from the real situation. For example, the sampling pipeline is too long, resulting in the lag of sample flow and poor timeliness of samples; the dead volume of the pipeline leads to incomplete replacement of samples and cross-contamination of samples.

A：SHIGAO solution: fast loop and dead volume control

The rapid circuit ensures the circulation of samples, and the pipeline optimization + low volume valve design reduces the dead volume of the pipeline. At the same time, after the sample analysis is completed, the vacuum system is used to drain the residual samples in the pipeline to prevent cross-contamination and the retention of dangerous gases, ensuring the safety of use.

Q：Problem 2: It is difficult to control the phase state of samples

Liquid samples need to be vaporized, but insufficient vaporization heat will lead to the coexistence of gas and liquid phases (such as chlorosilane), resulting in deviation in sample detection.

A：SHIGAO solution: customized heating solution

According to the actual conditions and material properties, we customize heating vaporization solutions and combine them with SGAO's self-developed high-efficiency vaporization valve to achieve complete vaporization of samples in polysilicon and chlor-alkali industries.

Q：Question 3: Sample impurity removal

In the process of removing impurities, some target components may be mistakenly removed or new impurities may be introduced. For example, when using adsorbent to remove impurities, if the adsorbent is not properly selected, it may adsorb the target components.

A：SHIGAO solution: electronic special gas purification

For the complex impurities (acidic gas, sulfide, particulate matter, etc.) in electronic special gases, the fourth generation process iteration is used to achieve accurate purification, which meets the strict requirements of semiconductor gas detection for ultra-trace impurities.

Q：Question 4: sample dehydration

For some samples containing water, if the dehydration is not complete, the water may form interference peaks in the chromatographic column or affect the service life of the chromatographic column. However, excessive dehydration may also lead to the loss of some water-soluble components.

A：SHIGAO solution: Cyclone separation upgrade

By enhancing the synergistic effect of condensation and dynamic separation by centrifugal force field through eddy current refrigeration, the efficient purification of water and solid particles (above 0.1μm) in sulfur/corrosive gas can be achieved.

Q：Question 5: Multi-channel sampling point switching problem

In the process of multi-channel sampling point analysis, manual switching of sampling points is not only inefficient, but also prone to operation errors, resulting in inaccurate sampling or missed sampling.

A：SHIGAO solution: multi-channel intelligent switching system

PLC+ central platform collaborative control supports automatic switching of multiple sampling points and joint control requirements. Pipeline valves can be closed remotely or on-site according to safety requirements to avoid safety risks caused by leakage of toxic and harmful sample gas.

From sample collection, pretreatment to injection, each link has been carefully designed to ensure the integrity and representativeness of samples. At the same time, we also provide personalized pretreatment solutions for different industries and application scenarios to meet your diverse needs.

In the future, we will continue to be committed to technological innovation, continuous improvement of product performance, to provide you with better products and services. Thank you for your attention and support, we look forward to creating brilliance with you!