What is a conductivity probe used for?

• A. A conductivity probe is used in a conductive fluid to measure level
• B. A conductivity probe measures temperature
• C. A conductivity probe measures viscosity
• D. A conductivity probe measures pH

Answer: (A)

A conductivity probe responds to how well a liquid conducts electricity. In a tank or pipeline, conductive fluids provide a path between the probe’s electrodes, so when the liquid reaches and surrounds the probe, the sensor detects current flow and can indicate the presence of liquid at that level. This makes it useful for measuring or detecting level in applications where the liquid is conductive.

It isn’t used to measure temperature, viscosity, or pH. Temperature requires a temperature sensor, viscosity needs a viscometer, and pH requires a pH electrode.