How to select gas analysis instruments? These points are very important

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This post was last edited by wx_gkFUk on 2023-2-17 13:40. How to select gas analysis instruments? These points are very important. For inquiries related to products, please contact: 18700867732 (WeChat: qhzsy-2015). Gas analysis instruments are a type of industrial process control device. In industrial production processes, especially those involving chemical reactions, such as in various chemical plants, the pharmaceutical industry, air separation industries, steel manufacturing, and coal chemical processing, it is widely used to guide the production process. Therefore, it is very important to select the appropriate gas analysis instruments (systems). Some companies make mistakes in this selection process due to carelessness or in an attempt to save money. In mild cases, the instruments cannot be used properly or require extensive maintenance; in severe cases, it can lead to safety hazards in production. Due to the varying operating conditions and production environments of different manufacturers, there are a great many types of gases that need to be analyzed and tested. For different gases, it is necessary to provide customers with solutions based on their actual operating conditions and requirements when selecting appropriate equipment. Take the most common oxygen analyzer as an example; there are electrochemical principles, zirconia principles, laser principles, and magnetic oxygen principles applied in oxygen analyzers. Different principles are suitable for different operating conditions, and their cost-effectiveness also varies. First of all, when making a selection it is necessary to understand the essence of things; one should not make generalizations. It is not true that all domestic instruments are inferior to imported ones. The domestic industry has also developed over the years; for routine parameter testing of common gas analysis instruments, the performance and lifespan of domestic instruments are not necessarily inferior to those of imported instruments, and moreover, domestic instruments are much cheaper than imported ones. The following points outline how to select gas analysis instruments: First, determine the operating conditions at the site of use. This involves analyzing the intended usage mode of the instrument (portable or inline), whether explosion protection is required, the composition of the gases (one or more types), the approximate ranges for pressure, flow rate, and concentration, as well as temperature and humidity. It is also necessary to consider whether there is water vapor, dust, or corrosive gases such as acids or bases present, as all these factors can affect the final analysis results. Secondly, regarding signal output, current output, alarm upper and lower limits, whether a network interface is required, whether wireless transmission is needed, and whether digital output is necessary, etc., it is also necessary to communicate with the manufacturer one by one. Therefore, it is essential to provide the gas analyzer manufacturer with accurate information regarding the actual operating conditions and parameters. Only with these basic details can the manufacturer of the gas analyzer carry out a preliminary selection based on those operating parameters. Any lack of one of these process parameters can lead to problems when selecting analytical instruments, preventing them from meeting the required standards; this may result in inaccurate detection data or frequent issues after use, which in turn entails high maintenance costs. Therefore, when making a selection, it is essential to understand the process parameters of the monitoring points, as these are the necessary operating condition parameters for the selection. II. Stability and applicability of the preprocessing unit. When the parameters of the gas under test do not meet the detection requirements of the gas analyzer, preprocessing is necessary (such as cooling, pressure reduction, corrosion prevention, dust removal, etc.). The preprocessing unit of the gas analyzer is one of the key components of the gas analysis system, and its importance is no less than that of the analysis instrument itself. Why does the preprocessing system play such an important role? Since gas analyzers are precision instruments with relatively strict operating conditions, factors such as the temperature, humidity, flow rate, and pressure of the gas to be analyzed must meet certain requirements in order to conduct testing; otherwise, the results obtained will not be reliable and thus lose their practical value as a guide. However, the environments in which gas analyzers are used are often chemical processing environments with harsh operating conditions. Therefore, the various preprocessing components used in the pre-treatment unit of a gas analyzer must have high reliability. Taking into account the parameters of the process medium, a redundant design should be considered to ensure the proper operation of the analyzer. Otherwise, under harsh testing conditions, the sensors of the gas analyzer are prone to damage or other problems. III. The R&D, manufacturing, and after-sales capabilities of instrument manufacturers. As the saying goes, “It’s not the presence of problems that matters; it’s the inability to resolve them properly.” Whether it’s imported or domestically produced gas analyzers, manufacturers cannot guarantee that their products will not encounter any issues during use. However, when problems arise, the manufacturer’s response time and after-sales attitude are extremely important. The cost of shutting down a production line for one day is enormous. If instruments are purchased from intermediary companies, when there are problems with them, the customer must go through the dealer and then the manufacturer – multiple layers of contact are required to reach the manufacturer’s technical staff. If purchases are made directly from the manufacturer, the above issues can be largely avoided. When making purchases, whether from intermediaries or manufacturers, it is essential to specify in the purchase contract details regarding training, installation, how to handle any issues that may arise, and the time frame within which assistance will be provided in case of problems, thereby avoiding disputes related to after-sales service. Therefore, when selecting a product, it is essential to choose manufacturers and distributors with solid capabilities, so that any issues that arise during the use of the analyzer can be properly resolved. Spare parts, timely after-sales service, as well as the technical performance and stability of the product are also among the factors that influence the purchase decision. IV. Investigation of enterprises using the same operating conditions (performance assessment): If there are only a few individual analytical instruments, on-site inspections can be omitted. For large-scale, complete gas analysis systems in large quantities, the purchasing company can conduct appropriate on-site inspections. For example, one can go to the manufacturing companies they intend to purchase from for on-site inspections, in order to assess their production management practices, company size, technical capabilities, etc., and obtain first-hand information through these visits. It is also possible to contact production enterprises or users that are similar to one’s own in order to conduct an inspection, to find out which gas analyzers they use, how well they perform, what their prices are, and whether adequate after-sales service is available. Through on-site inspections, the most accurate and genuine information can also be obtained, which is helpful for the final selection. After saying all this, the ultimate goal is to tell everyone that when selecting gas analysis instruments, it is essential to understand the underlying principles; specific problems need to be addressed individually. The best choice is one that suits the specific conditions of one’s own production process. It’s not true that imported instruments are necessarily better than domestic ones – what matters most is selecting an instrument that fits the process requirements. During use, it is necessary to strengthen training for the operators and increase their understanding of the products, so as to ensure that the analytical instruments truly serve the production process. For product-related inquiries, please contact: 18700867732 (WeChat: qhzsy-2015)