Discussion on the selection of mass flow meters
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This post was last edited by Sasa 1 on 2021-4-5 22:34. Question 1: When selecting mass flow meters, what aspects do people generally pay attention to? I would like to ask everyone for their opinions on this; thank you. Question 2: Do you think there is any difference when choosing between split-type and integrated types? Where is it mainly reflected? Thank you all
Ask the manufacturer; they will tell you if you pay them.
The first question is easy to answer: if you are in purchasing and only care about the price； If you are the person in charge of the workshop and are concerned about technology and performance, as well as price ； If you are a maintenance staff member, you’ll be concerned about after-sales service and training; if you’re an ordinary employee, just take it easy and don’t worry too much: lol
For the first question, I think you need to refer to the relevant specifications and consult the manufacturer. A practical criterion for making a decision is that mass flow meters are commonly used when high precision or accurate measurement is required. When selecting a flow meter, process parameters come first; thereafter, you can verify the options one by one based on specific examples. As for the second question, mass flow meters are generally of integral design. If a split-type design is needed, it is usually because the installation location does not allow easy access to the gauge face, necessitating the placement of the transmitter in a location where it can be easily viewed. Alternatively, harsh operating conditions such as temperature or corrosivity may have adverse effects on a transmitter installed directly in that environment. To protect the transmitter, a split-type design can extend its service life; other reasons might include insufficient operational space or various other site-specific factors.
1. Try to avoid using straight-tube types. 2. Don’t be too strict about pressure loss, as it is generally twice as large as that of an orifice plate. In the case of a pump circuit or with a series-connected control valve, they can deliver several dozen KPA of pressure to the flow meter; for larger diameters, a lower pressure level may be sufficient, which can result in significant cost savings. 3. It is modular; the header can be placed on the ground for easy maintenance, especially for flow meters located at the upper part of the pipe tray. But it will cost a few thousand more dollars.
I’m also new to this field and have only recently consulted the technical staff at flow meter manufacturers. Regarding question 1: it is generally necessary to know the intended use, range, accuracy, material, explosion protection rating, output signal, whether Hart communication is available, flange connection type and diameter, electrical interface size, operating pressure, name of the medium, operating temperature, and so on. Regarding question 2, whether to use an integrated or separate design, or whether it needs to be displayed, it really depends on the requirements of the actual site and the observations made there. If there is a PLC or DCS control system, it can generally be observed on the system control panel.