A flow meter with electrodes is called what type of flow meter?

A flow meter with electrodes is called what type of flow meter?

• A. Magnetic flow meter
• B. Ultrasonic flow meter
• C. Vortex flow meter
• D. Rotameter

Answer: (A)

A magnetic flow meter. In this type, a magnetic field is applied across the flow inside the pipe, and as the conductive liquid moves, Faraday’s law induces a voltage between electrodes placed in the flow stream. The voltage is proportional to the flow velocity, so the meter uses that signal to determine the flow rate. This method requires the liquid to be electrically conductive (saline water, slurries, etc.), which is why the electrode-based sensing is a hallmark of magnetic flow meters. The other options rely on different measurement principles: ultrasonic meters use sound waves and transducers, vortex meters detect pressure changes from shed vortices, and rotameters use a float in a tapered tube to indicate flow—none of which depend on electrode signals.

A magnetic flow meter. In this type, a magnetic field is applied across the flow inside the pipe, and as the conductive liquid moves, Faraday’s law induces a voltage between electrodes placed in the flow stream. The voltage is proportional to the flow velocity, so the meter uses that signal to determine the flow rate. This method requires the liquid to be electrically conductive (saline water, slurries, etc.), which is why the electrode-based sensing is a hallmark of magnetic flow meters. The other options rely on different measurement principles: ultrasonic meters use sound waves and transducers, vortex meters detect pressure changes from shed vortices, and rotameters use a float in a tapered tube to indicate flow—none of which depend on electrode signals.