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Capacitance Level Indicators (view source)
Revision as of 09:39, 24 January 2013
, 09:39, 24 January 2013no edit summary
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[[File:Capacitance level indicator.jpg|thumb|right|Capacitance Level Indicators]] | |||
* | [[File:Capacitance level indicator1.jpg|thumb|right|Capacitance Level Indicators]] | ||
* | '''Capacitance Level Indicator''' is a level indicator in which the material being monitored serves as the dielectric of a capacitor formed by a metal tank and an insulated electrode mounted vertically in the tank. | ||
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==Application== | |||
* For petrol diesel and oil storage tanks and depots | |||
* Water storage tanks (fully insulated) | |||
* Aggregate and powder silos | |||
* Marine tank and draught gauging | |||
* Chemical and pharmaceutical industries | |||
* Hot bitumen storage | |||
==Principle== | |||
Capacitance level indicator utilizes the capacitance formed between the sensing probe and the metallic vessel wall. A high frequency sine wave is applied between the probe and the vessel wall. | |||
A change of the medium level will induce a change in the current of the applied sine wave. When the capacitance in the vessel increase, Impedance will decrease and current will Increase. Vice versa, when the capacitance in the vessel is small, the impedance will increase and current will decrease accordingly. | |||
==Features== | |||
* Suitable for high temperature, high pressure and corrosive environment. | |||
* Not affected by noisy, dusty, misty and changes In the temperature. | |||
* No blind distance, ideal for different tanks. | |||
* Economical for large tanks. | |||
* 4-2OmA output compatible for most control systems and meters. | |||