Conductivity Level Sensor Working Principle

The tc sensor operating principle is based on temperature induced change of an electrically heated sensing element.

Conductivity level sensor working principle.

The usual conductivity range for a contacting sensor is 0 01 to 50 000 us cm. When the liquid covers the electrodes it forms a part of an electric circuit causing current to flow. Measurement principle the conductivity of a liquid medium may vary widely. Thermal conductivity is a property of each gas.

Higher conductivity samples require larger cell constants. For frp or other plastic tanks an earth electrode is required. Sensor uses conductivity between the electrode and the ground to detect a level. Ultrasonic level instruments works on the basic time of flight principle which states that sending a sound wave from a peizo electric transducer to the contents of the vessel which may contain liquid solid or slurries level.

Because a given cell constant can be used only over a limited range two possibly three cell constants are required to cover the entire range. To measure low conductivities in pure and ultrapure water choose conductive sensors. Capacitance level sensors excel in sensing the presence of a wide variety of solids aqueous and organic liquids and slurries. Once the liquid reaches the fill limit determined from the installation height of the electrode the liquid medium closes the dc free alternating current circuit between the two electrodes or between the container wall and an electrode.

Use toroidal sensors in media with high conductivity e g. Readings are positive for hydrogen using air as the reference gas. Milk beer bases acids brine and apply 4 electrode sensors where a wide measuring range is required e g. Common cell constants are 0 01 cm 0 10 cm 1 0 cm and 10 cm.

The sensor selection depends on the application and the conductivity range.