Types of flow meters and it's working principle.
Advantages and disadvantages of each application wise

Question

Accepted Answer

Flow meters measure the flow rate of fluids or gases. There are various types with different working principles.

Differential Pressure Flow Meters: Measure flow by creating a pressure drop across an obstruction in the flow path (e.g., Orifice Plate, Venturi Tube). Advantages: Simple design, low cost. Disadvantages: Pressure loss, limited turndown ratio.
Positive Displacement Flow Meters: Measure flow by dividing the fluid into known volumes and counting them (e.g., Piston, Oval Gear). Advantages: High accuracy, suitable for low flow rates. Disadvantages: Limited turndown ratio, susceptible to wear and tear.
Turbine Flow Meters: Measure flow by the rotation of a turbine placed in the fluid stream. Advantages: Wide flow range, good accuracy. Disadvantages: Requires clean fluids, sensitive to fluid properties.
Electromagnetic Flow Meters: Measure flow by applying a magnetic field and measuring the induced voltage (e.g., Faraday's Law). Advantages: No moving parts, suitable for conductive fluids. Disadvantages: Limited accuracy at low flow rates, high cost.
Ultrasonic Flow Meters: Measure flow by transmitting and receiving ultrasonic waves through the fluid. Advantages: No pressure loss, suitable for various fluids. Disadvantages: Limited accuracy in non-ideal conditions, high cost.

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