Conductivity Level Sensor Working Principle

Higher conductivity samples require larger cell constants.

Conductivity level sensor working principle.

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. Measurement principle the conductivity of a liquid medium may vary widely. 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. To measure low conductivities in pure and ultrapure water choose conductive sensors.

Readings are positive for hydrogen using air as the reference gas. Thermal conductivity is a property of each gas. Capacitance level sensors excel in sensing the presence of a wide variety of solids aqueous and organic liquids and slurries. When the liquid covers the electrodes it forms a part of an electric circuit causing current to flow.

Sensor uses conductivity between the electrode and the ground to detect a level. The sensor selection depends on the application and the conductivity range. The technique is frequently referred to as rf for the radio frequency signals applied to the capacitance circuit. Milk beer bases acids brine and apply 4 electrode sensors where a wide measuring range is required e g.

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 sensor has a pair of electrodes and applies alternating current to them. The tc sensor operating principle is based on temperature induced change of an electrically heated sensing element. For frp or other plastic tanks an earth electrode is required.

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