Flow meters are devices for measuring the gas or liquid flowing through them. They are used in a variety of applications where flow measurement is required to check for leaks, monitor pressure, and even prevent asthma attacks in patients with asthma. For low flow rates and small piping applications, it is recommended to use miniature flow meter, mini thermal flow meter, or metal tube rotameter. The devices are classified according to drive systems with mechanical, ultrasonic, pressure and electromagnetic mechanisms. Let’s see how they work.
Mechanical flow meter
These are traditional devices that are still used today. The basic types use turbines or wheels that are inserted into the pipes to measure the speed and calculate the volume flow based on the area of the pipes in which they are located. Mechanical flow meters can be of various types, with common examples such as piston meters that use rotating pistons, gear meters, a pair or more of two right-angle rotating gearwheels, and single jet meters that use impellers to increase and decrease the liquid.
Ultrasonic flow meter
Ultrasonic flow meters have numerous advantages over their mechanical counterparts. They can be used to measure all types of liquids, including molten sulfur, water, and chemicals, provided that the speed of sound can be calculated. Since no mechanical parts are used, the maintenance of these devices is relatively low. They are also much more reliable than mechanical systems and quicker to use because they do not have to be inserted into a pipe, but are simply attached outside.
Transit and Doppler are the two types of ultrasonic measuring devices. Both use transducers to measure flow but in different ways. A Doppler factor affects the frequency change, while the change in the liquid affects the reflection. This change corresponds to the flow. On the other hand, Transmit meters have transducers that transmit signals through a volume of liquid from opposite sides. The time difference between the two signals provides the flow.
Pressure based flow meters
With pressure-based flow meters, the differential pressure or dynamic pressure determines the flow. Cone meters, pitot tubes, and Dall tubes are some examples of these types of devices.
When the differential pressure is used, the pipe contracts to create a pressure drop. The more liquid that is introduced, the greater the pressure generated. The flow is determined by determining the difference between the upstream and downstream pressure values. Dynamic pressure is obtained by measuring the difference between static (pressure at a stagnation point) and stagnation pressure (the point at which the viscosity of the fluid is zero).
Electromagnetic flow meter
Electromagnetic meters, of course, use magnetic fields to determine the flow. When a magnetic field is generated in a pipe section, the conductive fluid particles produce voltage fluctuations. This change is used to measure the flow rate. These meters are ideal for calculating certain water-based liquids such as manure but are not suitable for hydrocarbons, oil, and distilled water.
When choosing flow meters, several variables have to be considered. Since a type with certain gases or liquids may not work, choosing the wrong device is an expensive waste. You can visit the website https://www.silverinstruments.com and check out the various devices that can be used for gases or liquid applications.
Characteristics of Flow Meter
With the steady growth of science and technology, various types of measuring instruments have been invented, and one of these technologies is measuring devices for measuring water flow. They help measure the flow rate of certain types of liquids and gases. These instruments are available in two different versions, e.g. Flow meter for oil or water. The measurement functions and the amount of liquid that flows through them during a certain spam time also vary. Low flow or mini flow meters measure the flow of liquid that flows at low speed. They are used for both household and industrial purposes.
Low flow meters, as the name suggests, measure very small amounts of liquid, such as water. This can be helpful to determine the amount of water in households, industries, and public places and to plan water protection for future use. Two types of measuring devices can be used to measure water flow. These are the velocity meter and displacement meter. In the first type of meter, the water volume is measured by measuring the speed. The second type compares the mechanism used to measure flow with the previous water flow. The frequency with which the chamber is filled is the amount of water. The main features of a low flow liquid flow meter are:
It helps measure small amounts of liquid and is, therefore, suitable for home use and use in small industries.
They are much cheaper than other meters.
They are very easy to access, clean, assemble and disassemble on site, which simplifies their use.
They are relatively small, which helps to reduce the relative speed.
Even though they are small, they are very easy to care for.
Low flow flowmeters are very useful in homes, apartments, and offices because they are considered to be more precise, are also very easy to install and have all the interesting functions. These water meters are also becoming more popular as they help to avoid wasting water unnecessarily. You can usually measure the low water flow rate, which makes them more useful in homes and small industries.