Digital flow meters will provide more reliable flowrate measurements at a higher cost. In conclusion, mechanical flow meters are great for low-precision applications on a budget and will provide accurate readings with certain fluids at specific temperatures. Another slight disadvantage is the need to be plugged in, as outlets are not always easy to reach in industrial instances. Unfortunately, high quality usually comes with a high price tag. The technology that these meters rely on can be expensive. The primary downside to digital flow meters is price. This makes the readings they provide more reliable in applications that require precision. Because they have exterior power, they rely less on the pressure and temperature of fluid. At the least, these meters are easier to read, but they can also provide improved accuracy with more complex interior workings. You can find almost every type of flow meter with a digital display. Digital flow meters take the data the mechanism is capturing and translate it into easy-to-read quantities that are much more reliable than traditional rotameter-style flow meters. In recent years, flow meters with digital displays and measurement methods have been standard in most industries. ![]() Some liquids could even obscure the reading due to an obtrusive color or non-transparency. They have a heavy reliance on fluid viscosity, temperature, and type. While these mechanical flow meters give the user a good idea of what the flowrate is, they are not very reliable or consistent. These advantages make rotameters ideal for applications that do not require precise flow measurement. This has made them extremely popular since the early 20th century. They are also simple and inexpensive, keeping costs low. Rotameters require no external power or fuel, as they use the force of the fluid and gravity to measure flowrate. They are a type of variable area meter and display flowrate using a floater that lines up with a measurement printed on the tube. Rotameters are flow meters that measure the volumetric flow rate of liquid in a closed plastic or glass tube. The most common type of mechanical flow meter is the classic rotameter. This value is shown on a digital display or mechanically indicated through some non-electric means. The display is what you look at to see what the flowrate is. When looking at whether you should get a digital or a mechanical flow meter, what you are looking at is the display (or readout). Mass flow meters are typically used in chemical and gas applications. Instead of volume/time, these flow meters measure mass/time. These meters measure force that results from the acceleration of mass in a system. These are less accurate when flow is unsteady or turbulent. By doing this, they are able to calculate volumetric flowrate. Velocity meters measure, as their name suggests, the velocity of a stream. These flow meters are popular due to their accuracy. While all other types of flow meters measure some other variable and convert it into flowrate, PD meters measure the actual flow of liquid or gas. This calculates the amount of fluid transferred. Positive displacement (PD) flow meters measure a volume of fluid in a closed space, deliver it forward, and then fill that space again and repeat the process. The primary element produces a change in kinetic energy while the second element measures the differential pressure present. ![]() ![]() These meters use a primary and secondary element. This category of flow meters, which represents about 20% of all the world's flow meters, measures differential pressure across an orifice where flow is directly related to the square root of the differential pressure measured. Below are listed some of the most popular types of flow meters. There are almost as many varieties of flow meters as there are applications for them, so we cannot possibly cover them all. The first thing you need to know about flow meters is how they work. What's the difference? In this post, we will look at what differentiates flow meters, including operation and displays. When shopping for flow meters, many people debate digital vs mechanical flow meters. Flow meters can clamp onto a pipe and measure flow with a type of sensor placed inside the pipe or act as an all-in-one component, allowing fluid or gas to pass through their bodies as they measure. ![]() Depending on the application, flowrate is measured as either volume or mass. Flow meters are, as the name suggests, devices that measure flow in a piped system.
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