What reading do Magnetic Flow Meters show when the fluid has low conductivity?

What reading do Magnetic Flow Meters show when the fluid has low conductivity?

• A. A positive reading
• B. 0 reading
• C. Full scale reading
• D. Erratic reading

Answer: (B)

Magnetic flow meters rely on Faraday’s law: a conductive fluid passing through a magnetic field generates a voltage between electrodes that is proportional to flow velocity. For that signal to exist, the fluid must be sufficiently conductive to complete the electrical circuit between the electrodes. When conductivity is too low, the induced signal is too weak to be measured reliably, so the meter cannot detect flow and typically shows a zero reading. In practice, fluids like distilled or deionized water often fall below the meter’s minimum conductivity, resulting in a 0 reading rather than a meaningful flow indication.

Magnetic flow meters rely on Faraday’s law: a conductive fluid passing through a magnetic field generates a voltage between electrodes that is proportional to flow velocity. For that signal to exist, the fluid must be sufficiently conductive to complete the electrical circuit between the electrodes. When conductivity is too low, the induced signal is too weak to be measured reliably, so the meter cannot detect flow and typically shows a zero reading. In practice, fluids like distilled or deionized water often fall below the meter’s minimum conductivity, resulting in a 0 reading rather than a meaningful flow indication.