How to correctly understand the thermal gas mass flowmeter

How to correctly understand the thermal gas mass flowmeter The thermal gas mass flowmeter is being recognized and used by more and more users due to its unique and excellent characteristics, and has been used in many gas flow measurement occasions. However, there are many problems and misunderstandings in these applications. Many manufacturers' irresponsible misleading propaganda and product quality defects have caused many obstacles and blind spots in the use of products, causing many users to misunderstand thermal gas mass flowmeters. Some blindly think that thermal flowmeters can measure gases under all working conditions, while others reject and oppose thermal flowmeters. It is proved by data that improper selection of flowmeters accounts for about 70% of the failure probability of flowmeters, and 30% due to flowmeter product quality or other reasons. It can be seen how important model selection is to flowmetering. Users of thermal gas mass flowmeters should pay special attention not to choose a certain type of flowmeter, unless you choose to replace the original flowmeter, so that this work can be handed over to the seller. You only need to provide as complete working condition data and some technical requirements as possible. For example, the flow range (it is recommended to use the standard flow unit), the medium to be measured, the diameter of the pipe, the material of the pipe, the working pressure, the working temperature, whether explosion-proof is required, the working environment temperature of the flowmeter, the signal power requirement, the accuracy level, and what is the application In terms of technology, measure the dryness and cleanliness of the medium. When measuring the mixed gas flow rate, the percentage value of each medium must be provided. If there are conditions on site, the flow meter should be integrated. If it is a separate body, since the transmission signal cable is a part of the measurement bridge, it has a resistance value. No matter how well it is done, because the resistance value of the measurement probe is very small, the resistance value of this cable will definitely affect the The calculation and processing of the electronic circuit, coupled with the influence of the site environment, will cause the resistance value to drift. If you have to choose a split body, it is recommended that the split distance be as short as possible. Of course, unless you have low requirements for measured data, don’t care about the deviation, and just look at the flow trend, you can still choose those low-end thermal flowmeter products. The key to correctly choosing a thermal gas mass flowmeter is to learn more, master the measurement principle and product performance, and have more in-depth exchanges with the business personnel of the product manufacturer to distinguish the characteristics of each brand.

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