Liquid Flow Meter: Working, Various Types, and Applications

liquid flow meter- Liquid Flow Meter: Working, Various Types, and Applications

Measuring the correct flow of liquids is important in various industries. It is a crucial parameter that cannot be considered casual. It is vital to know the right flow rate at the right time and place in most industrial operations. Many flow measuring applications are required to keep the product quality during manufacturing. So, to fulfill all these essential industrial requirements, the use of liquid flow meters is paramount. They are used in a variety of industries. The primary role of these devices is to calculate the flow rate of different liquids passing through the pipes. The type of liquids may vary according to industrial requirements, such as water, gases, steam, and oil. However, these meters are available in a wide variety, but the working is the same. But, they are operated differently to obtain accurate flow measuring results.

Various types and work criteria of fluid measuring devices

Mass flow rate calculators

Let’s begin with the mass flow meters. These meters work to determine the mass flow of liquids flowing in the pipes. Mass flow rate refers to the measurement of liquid substance passing per unit time, and it is directly dependent on the velocity and density of the fluid. This liquid flow meter is an optimum solution to measure the flow rate of thick and sticky substances. You can take an example of oil which is thick and sticky. So, to compute the flow rate, the meter uses heating. The process involves heating a section of fluid to observe the temperature change. The further types of this meter are Coriolis, thermal, and inertial, etc. The common application of these meters is in chemical, gas and oil, pharmaceutical, mining, and power industries.

Velocity flow rate calculators

The liquid flow rate measurement is based on the speed of the liquid substance under this measuring device. They capture the flowing rate of liquid substance running inside the pipes. In the working feature of these meters, the flowing rate of liquid is equivalent to a cross-section of the pipes. The velocity of the liquid also proliferates it to conclude the correct flow rate. The application of these flow meters is suitable for both industries that use liquid and gases. You can take an example of food & beverages, petrochemicals, oil and gas, mining, and chemicals, etc. These meters are further classified into several categories such as:

Vortex: This meter gauges liquid flow rate by causing an obstruction inflow using the bluff body. The obstruction causes vortexes, and their numbers indicate the flow velocity.

Ultrasonic: They send ultrasound to the fluid flowing inside the pipes, and the sound then sends back a signal that indicates the flow rate.

Turbine: These meters have turbines or rotating blades that work as the fluid flows through the meter. To calculate the velocity, they measure the frequency of blade rotation.

Electromagnetic: The meter determines the voltage to gauge the flow rate of the liquids.

Paddlewheel: The working of this meter is as similar as the turbine meter. The moving fluid produces electrical pulses that refer to the flow rate of liquid.

Differential pressure flow rate assessment

The working of this liquid flow meter is mainly based on scientific principles, and it is the most common application of flow measurement. The special feature of this meter is that it can work for both liquid and gas flowing in the pipes. The liquid has to increase velocity to pass through the pipe, thus decreasing the pressure. Therefore, the difference in pressure of the flow helps technicians to calculate the flow rate. As the name suggests, this meter measures the flow rate with the pressure difference.

However, to evaluate the rate of liquid flow, some calculations are required. So, this device is used under the supervision of qualified and experienced technicians. The common application for this flow rate measuring device is in mining, pharmaceuticals, chemical, and HVAC industries. They are also considerably used by the food processing units to measure the accurate flow of liquids. This meter is also popularly known as the DP flow meter.

Positive displacement flow rate evaluation

PD is the acronym of the positive displacement flow meter. It is one of the liquid flow meters that calculate the flow rate of liquid using fluid volume. It tracks the volume of the liquid that comes through the pipe and detects the flow rate. The meter has rotating elements that rotate when the fluid flows through it. The in-built mechanism of the meter tracks the rate of rotations and traces the number of fluid passes. The best thing that is popular about these meters is their extreme accuracy. The major application of these meters is in chemical industries.

The Bottom Line

liquid flow meter used to determine the rate of fluid flowing, and many meters have potential benefits and drawbacks. So, when choosing the accurate flow meter, you must select one wisely as per specific measuring requirements.


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