Conductivity Level Sensor Working Principle
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Common cell constants are 0 01 cm 0 10 cm 1 0 cm and 10 cm.
Conductivity level sensor working principle. Sensor uses conductivity between the electrode and the ground to detect a level. The sensor has a pair of electrodes and applies alternating current to them. When the liquid covers the electrodes it forms a part of an electric circuit causing current to flow. Use toroidal sensors in media with high conductivity e g.
Measurement principle the conductivity of a liquid medium may vary widely. The usual conductivity range for a contacting sensor is 0 01 to 50 000 us cm. Readings are positive for hydrogen using air as the reference gas. The tc sensor operating principle is based on temperature induced change of an electrically heated sensing element.
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. Higher conductivity samples require larger cell constants. The technique is frequently referred to as rf for the radio frequency signals applied to the capacitance circuit. 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. Thermal conductivity is a property of each gas. To measure low conductivities in pure and ultrapure water choose conductive sensors. 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.
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.
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