There are many things you need to pay attention to when selecting a mass flow meter

There are many matters that you need to pay attention to when selecting a mass flowmeter. There are many mass flowmeters that use the modulation effect of the fluid mass flow on the oscillation of the vibrating tube, that is, the Coriolis force phenomenon. The mass flowmeter for the purpose of mass flow measurement is generally composed of composed of sensors and transmitters. Matters needing attention in the selection of mass flowmeters 1. Pay attention to choosing the correct brand: Generally, factors such as product quality, sales price, after-sales service, technical level, product characteristics, production scale, and corporate reputation of the manufacturer should be comprehensively measured. 2. Pay attention to choose the correct range: ① Convert the flow rate you need into the flow rate (mass flow rate) under the standard state. ②According to the mass flow conversion coefficient table provided by the manufacturer, convert the mass flow value of the gas you are using into a mass flow value equivalent to nitrogen (calibration gas). If you want to calibrate according to the gas you actually use, please explain to the manufacturer. Questions about mass flow conversion coefficients are further answered below. ③ Determine the required standard range. Manufacturers generally have their own standard ranges of various specifications, and the maximum flow rate you actually use should be lower than a certain standard range value. The selection of the standard range should avoid too large or too small. The error index of the mass flow rate is stipulated by the percentage of the full scale value. If the actual flow rate is small and the range value is too large, the relative error of the measured value will be large. 3. Pay attention to choose the correct working pressure indicator: Different products may have different working pressure indicators, so pay attention to choose the product that suits you. In addition to the maximum working pressure of the mass flow controller (MFC), there is another working pressure index: the working pressure difference, that is, the pressure difference between the inlet and outlet of the MFC. Also pay attention. 4. Pay attention to the form of the shunt inside the product: The form of the shunt is not a technical indicator, but it is used here as a precaution for users because we have found that there have been some malfunctions caused by the shunt in actual use. Common There are three types of shunts: tubular, cone and powder metallurgy, each with its own characteristics. In comparison, the first type is not easy to block and thus has the longest service life, while the last type is relatively easy to block. We have found several cases like this: the user uses a kind of imported MFC (powder metallurgy flow splitter), and the gas source is strictly filtered, and the blockage still occurs quickly; after replacing our product, it has been normal Work. The problem is clearly with the shunt. According to the analysis, it may be that the used gas has strong adhesion, which leads to the clogging of the powder metallurgy splitter. Of course, the powder metallurgy splitter also has its advantages, and other splitters also have their shortcomings. Users should consider it according to their own use conditions. 5. Pay attention to choose the appropriate accuracy index: Accuracy, linearity, and repeatability are several important indexes. Among them, repeatability is especially important in many applications. The index does not necessarily pursue the highest. You should consider your actual needs. The indicators given by the manufacturer are not at ease, and qualified users can also calibrate it by themselves. For the calibration method, please refer to the relevant content below. 6. Pay attention to select the appropriate response time index: Some application systems have higher requirements on the response time of MFC, and users should consider it according to their own conditions. While considering the response time index, attention should also be paid to its response process and dynamic characteristics. 7. Pay attention to whether there are any requirements for the installation position: Some manufacturers require that the products must be installed in a horizontal position. 8. Pay attention to the dynamic response characteristics of the product: Some systems have higher requirements on the dynamic response characteristics of the flow. In this case, the user should have a deep understanding of the response characteristics of the specific product. 9. Pay attention to the stability of the zero point: For metering products, the stability of the zero point is very important and difficult to guarantee. The zero stability of different products may be different. 10. Pay attention to the scope of application: It has a certain scope of application for the environment of use, medium temperature, gas source pressure, medium (especially for corrosive gases), etc. Please read the instructions carefully or consult the manufacturer.

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