What should be paid attention to when choosing a gas mass flow controller

What should be paid attention to when choosing a gas mass flow controller? A gas mass flow controller is a professional instrument used to control or measure gas flow. When purchasing, you need to understand and pay attention to the following issues, which will help flowmeter manufacturers to choose types and recommend Give you the right product. 1. Brands There are currently many imported and domestic brands in the domestic market. The product characteristics, quality, service, delivery time, and price of each company vary greatly. When purchasing, you should consider comprehensively and choose suitable and more cost-effective products. 2. Range In the flow controller selection, the measurement or control range index is very important, which is mainly reflected in the matching selection between the actual range range of the gas to be measured and the control range of the flow controller. For example, if a customer wants to use a 10SLPM gas flow controller to control the flow of 8SLPM and 10SCCM, it is obviously impossible to use a flow controller to do it. For another example, a customer currently wants to control an air flow of 3 SLPM, but considering that he may need to test 80 SLPM air in the future, he wants to buy a 100 SLPM air controller, although the mass flow controller has no control ability. Problematic, but in terms of control accuracy, this is not a good choice. 3. Pressure Pressure is crucial to the work of the flowmeter. All flowmeters must work within the range of the ordered pressure parameters. This is the working range promised by the manufacturer. For applications exceeding or lower than this pressure range, the manufacturer cannot guarantee reliable work. . When confirming the pressure parameters, it is necessary to confirm the inlet pressure range and outlet pressure range of the flow controller, and whether there is outlet back pressure, etc. These parameters are important references for the production of the flow controller. In addition, when using, it is necessary to ensure that the pressure is stable. If the pressure is not stable enough, it is necessary to consider increasing the pressure stabilization measures to obtain better flow control performance. In addition, the pressure resistance of the flow controller is also an important selection parameter. Please note that the pressure resistance and working pressure are completely different concepts. The pressure resistance of the flow controller is the pressure parameter that the flow controller can withstand without causing damage, but Under this pressure, the flow control may not be performed normally. This needs special attention when ordering. 4. Accuracy Control accuracy, linearity, repeatability, etc. are relatively important performance indicators, and they are also key selection parameters when selecting certain applications. These parameters are closely related to field application requirements and costs. The selection of these indicators requires a comprehensive assessment of application requirements, costs and other factors. In short, it is not expensive, it is suitable. 5. Installation direction Usually the flow controller is installed horizontally by default. However, in some industrial applications, in order to match the equipment space, it is necessary to use such as vertical, side upside down, etc., you need to confirm with the manufacturer at the time of purchase whether there will be any impact. 6. Gas Flow controller manufacturers will adopt different sealing measures for conventional air, nitrogen or corrosive ammonia, hydrogen chloride, etc., so this parameter is also very important when ordering, and it is also an important basis for flow calculation and conversion. In addition, during application, care should be taken that the gas is dry and does not contain water vapor impurities, so as not to cause pollution to the flow controller. In addition, in the application of multi-gas, attention should be paid to the difference in measuring range converted by different gases, the influence of the mixed use of corrosive and non-corrosive gases on the actual application, the influence of gas residue on the application, and so on. 7. Control mode There are analog control modes, common ones such as 0-5V, 4-20mA, digital such as 485, MODBUS, etc., or a variety of options such as flow controller local control panel control, etc., according to the actual application. 8. Power supply mode Flowmeter usually has dual power supply +/-15V power supply, single power supply such as 24V power supply, etc., can be selected according to the ready-made application configuration, such as PLC equipment used in the production line, etc., 24V power supply is a ready-made configuration, then choose 24V flow The controller is a convenient power solution. 9. Joints Our flow controllers are equipped with joints as standard. Some conventional ones, such as 3mm, 6mm, 8mm, 1/4'', 1/8'' double ferrules, 8mm hose connectors, etc. are all in stock, please communicate and select before purchasing.

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