Comparison of weight, induction and ultrasonic flow meters

Flowmeters are devices used to account for and measure the consumed liquid or gas. There are five main types of this equipment, and two of them, turbine and mechanical, were discussed in the previous article. Below we will study the principle of operation of the other three flowmeters – weight, induction and ultrasonic.

Features of the weight flow meter

Such equipment is designed to measure any liquids and gases (regardless of density or conductivity). The principle of operation of the device is based on two identical tubes (of equal diameter), which are curved in the shape of the Greek letter "Omega". They oscillate in two opposite directions.

At the moment when a liquid or gas passes through the cross section, the Coriolis force is triggered, which leads to deformation of the tube. The measurement is carried out by changing the shape of the product. The data is processed by a special electronic device, and the numerical value is displayed on the screen.

Features of the induction flow meter

This device is an ideal option when you need to measure the volume of liquid consumed, conducting current. This is one of the most accurate products to account for fluid flow. The minimum conductivity threshold of the measured substance is 5 µS/cm. the other technical and physical parameters of the liquid do not matter – neither temperature, nor pressure, nor density. Thanks to this, high measurement accuracy is achieved.

The principle of operation of the equipment is based on Faraday's law related to voltage induction in a moving conductor. A cast wedge gate valve can be installed in front of the device itself. The law says that if a conductor moves through a magnetic field, then a voltage is formed in it, the value of which directly depends on the average speed of its movement. In an induction flow meter, the liquid plays the role of a conductor, and a magnetic field is created around it.

The measured liquid begins to move, passing through the magnetic field of the flow meter, which leads to the formation of voltage. It is measured using electrodes. Depending on the magnitude of the voltage and the speed of fluid movement, the flow meter calculates its consumption.

Features of Ultrasonic Flow Meter

Suitable for measuring flow in full pipes, closed or open channels. The main feature is that the data is calculated depending on the difference in the time it takes for the signal to pass. The ultrasonic signal is applied in two directions: how the fluid moves and in the opposite direction. The time difference for the passage of signals allows you to find out the speed of movement of the measured liquid. The data is then converted to numeric values.