Home Business The most common types of digital flow meters used in sanitary processing

The most common types of digital flow meters used in sanitary processing

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What is Digital flow meter ?

Digital flow meter is high-tech devices with a customizable, touch screen interface. They are used to measure and display qualities such as mass flow, volumetric flow, gas temperature, atmospheric pressure, and gas pressure. An anemometer, a thermistor, a gauge pressure transducer, and an absolute pressure transducer serve different roles in a digital flow meter.

The most common types of digital flow meters used in sanitary processing

While the way digital flow meters differ primarily in terms of how they collect fluid velocity information, the process of converting this information from an analog to a digital form takes place in essentially the same way across all types of digital flow meters.

We will briefly describe the most common types of flow meters used in sanitary processing operations in the following paragraphs.

Coriolis flow meter

An extremely specialized digital flow meter called the Coriolis uses a lateral tube that vibrates and distorts in response to fluid flow pressure. A sensor is used to monitor and analyze the changes in the frequency, phase shift, and amplitude of these vibrations. By observing these changes, it is possible to determine the volume and density of the fluid under measurement.

The accuracy of flow measurement with a Coriolis meter is very high, regardless of the type of fluid or gas being measured. A disadvantage of this type of meter is that because of its “U”-bend, it is larger and heavier than other instruments, posing drainability concerns.

Magnetic flow meter

It is also known as magmeters, magnetic flow meters are used to determine the flow rate of liquids by measuring the voltage that a liquid generates when it passes through a magnetic field.

Electromagnetic induction is the principle at work in this type of meter. To function properly, magmeters require an electrically isolated pipe surface – such as a rubber coated steel tube – and a conducting fluid containing ions.

Several types of magmeters are available for the measurement of fluid velocity in a variety of fluids, including slurries and liquids containing embedded solids. However, the electrodes in this type of meter may be susceptible to corrosion when measuring certain liquids, which can result in inaccurate results.

In order to solve this problem, some magnetic flowmeters come with electrodes made from alloys with high nickel corrosion resistance.

Ultrasonic flow meter

It is possible to measure the velocity of a fluid by using ultrasonic transducers to calculate the volume of the fluid flowing through it. There are two main types of ultrasonic flow meters.

The transit time china flow meter measures the difference in the transit times of ultrasonic pulses propagating in the direction of the fluid flow, and those propagating in the opposite direction.

The Doppler shift (i.e., the frequency shift) of an ultrasonic beam reflected from particulates in a fluid flow is measured by Doppler flow meters.

Each type of ultrasonic flow meter is shown conceptually in the illustrations.

As a significant advantage of these types of meters is that the measuring sensors remain outside the flow of fluids, so they can be used for a wide variety of liquids, including corrosive materials and slurries, as long as the speed of sound through the measured fluid is known).

Furthermore, ultrasonic flow meters are usually inexpensive to operate and maintain since they don’t use moving parts.

Mechanical flow meters

As the fluid is mechanically displaced in the meter’s body to measure fluid flow velocity, mechanical flow meters are a family of devices. It consists of a chamber (or chambers) that block fluid flow and a rotating or reciprocating mechanism that allows a fixed amount of fluid to pass through the chamber.

An illustration of a turbine-type mechanical flow meter illustrates how flow velocity is determined by the speed at which the measuring mechanism rotates or reciprocates (typically a screw, piston, gears, disk, rotating vane, or diaphragm).

There are a number of types of mechanical flow meters. While some of these meters can tolerate some impurities in the measured fluid, they work best when the liquid being measured is clean, non-corrosive, and highly viscous.

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