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What should you watch out for when choosing products and ordering? - Focus on Microfluidic Control Technology

This is related to the immediate interests of users and involves more issues. Therefore, we try to give as much as possible an objective and objective answer.
(1) Pay attention to choosing the right brand
Generally should be a comprehensive measure of the manufacturer's product quality, sales price, after-sales service, technical level, product characteristics, production scale, corporate reputation and other factors.
(2) Pay attention to selecting the correct range
A. Convert the flow you need to the standard flow (mass flow).
B. According to the mass flow conversion coefficient table provided by the manufacturer, convert the mass flow value of the gas you use 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. There are further questions regarding the mass flow conversion factor.
C. Determine the required standard range. Manufacturers generally have their own standard range of various specifications, and the actual maximum flow you use should be lower than a certain standard range value. The standard range selection should be avoided too large or too small. The error indicator of the mass flow rate is specified as a percentage of the full scale value. If the actual flow rate is small and the scale value is selected too large, the relative error of the measured value is relatively large.
(3) Pay attention to selecting the correct working pressure indicator
Different product work pressure indicators may be different, pay attention to choose the right product for you.
In addition to the maximum working pressure, the mass flow controller (MFC) has another working pressure indicator: the working pressure difference, that is, the pressure difference between the inlet side and the outlet side of the MFC. pay attention.
(4) Pay attention to choose the right accuracy index
Accuracy, linearity, and repeatability are some of the more important indicators, and repeatability is particularly important in many applications. The indicators are not necessarily the highest, and their actual needs should be considered.
If you do not trust the indicators given by the manufacturers, qualified users can also calibrate themselves. Refer to the following for the calibration method.
(5) Select the appropriate response time indicator
Some application systems have higher requirements on the response time of the MFC, and the user should consider it according to his own situation. While considering the response time index, it should also pay attention to its response process and dynamic characteristics.
(6) Pay attention to the installation location
Some manufacturers' product requirements must be installed horizontally.
(7) Note the use of gas and the scope of application
MFM/MFC has a certain scope of application to the environment and media temperature, air pressure, and medium (especially the use of corrosive gases). Please read the instructions or consult the manufacturer.
(8) Attention to joint form
Swagelok and VCR connectors are usually available, and VCR connectors are better suited for high-end applications.
(9) Ordering should indicate:
Product name, model number, flow rate specification, calibration gas, use gas (especially corrosive gas), joint form and quantity.

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