Conductivity Level Sensor Working Principle

Common cell constants are 0 01 cm 0 10 cm 1 0 cm and 10 cm.

Conductivity level sensor working principle.

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. The usual conductivity range for a contacting sensor is 0 01 to 50 000 us cm. The tc sensor operating principle is based on temperature induced change of an electrically heated sensing element. Readings are positive for hydrogen using air as the reference gas.

To measure low conductivities in pure and ultrapure water choose conductive sensors. Sensor uses conductivity between the electrode and the ground to detect a level. Capacitance level sensors excel in sensing the presence of a wide variety of solids aqueous and organic liquids and slurries. For frp or other plastic tanks an earth electrode is required.

Thermal conductivity is a property of each gas. 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. The technique is frequently referred to as rf for the radio frequency signals applied to the capacitance circuit. Higher conductivity samples require larger cell constants.

Conductivity could in principle be determined using the distance between the electrodes and their surface area using ohm s law but generally for accuracy a calibration is employed using electrolytes of well known conductivity. Use toroidal sensors in media with high conductivity e g. The sensor selection depends on the application and the conductivity range. Measurement principle the conductivity of a liquid medium may vary widely.

When the liquid covers the electrodes it forms a part of an electric circuit causing current to flow.