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When a fluid contacts a heated object, it removes heat from the object and the temperature of the fluid increases. Thermal mass flow meters use this principle to measure flow.

Inside the electromagnetic flowmeter there is an electromagnetic coil that generates a magnetic field, and electrodes for capturing voltage. Due to this, the electromagnetic flowmeter can measure the flow in the pipeline.

The flow rate and the rotational speed of the impeller are proportional to each other. By embedding magnets in the rotary shaft and the impeller, the pulse signal can be extracted, and the number of revolutions can be obtained to convert the flow rate.

A sensor is installed outside the pipe wall, and the ultrasonic waves are transmitted to each other. The time difference between the forward flow and the reverse flow and the flow rate is calculated, and the flow rate is calculated based on this.

It belongs to the area flow meter.
The prevailing method is to suspend a float in a tapered tube (which increases in width as you go up). When fluid is forced between the conical tube and the float, a pressure differential is created.

Coriolis mass flow meters utilize within themselves a physical phenomenon known as the Coriolis effect. According to the Coriolis effect, the weight of an object is proportional to its velocity, so the mass flow can be known.

This device is a flow meter and utilizes a law theoretically proved by Theodore von Karman in 1912. In the presence of columnar obstructions (vortex generators) in the flowing fluid, alternating flow is generated downstream.