CAPACITANCE - RF - LEVEL CONTROLS


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	*A Technology for Every Level Application*
		*Satisfying the World's* *Level Control* *Requirements since 1986*

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CAPACITANCE

HiTECH Capacitance level instruments measure level based on changes in the electrical capacitance between the sensing element, referred to as the "probe" and earth ground.

The technology is applicable for both conductive and insulating materials, however, careful application considerations to both the equipment selected and the mounting configuration are required.

Principle of operation

Electrode, product and vessel wall form an electrical capacitor.

The capacitance is particularly influenced by three factors:

distance of the electrode plates
size of the electrode plates
dielectric value of material between the electrodes

Continuous level measurement

With continuous level measurement, the product level is continuously monitored and converted into a level-proportional signal which is either indicated directly or further processed.

The signal can be processed in two different ways: either via a signal conditioning instrument or via a compact sensor that outputs the signal directly as a 4 20 mA signal.

Level detection

Capacitance level switches from HiTECH output an two-wire ON-OFF 4 - 20 mA current signal when a certain level is reached, e.g. maximum or minimum levels.

These levels are detected at fixed position and are converted into a switching command, that can be triggered when the probe is covered or un-covered.

301 Oxford Valley Road, Building 505

Yardley, PA 19067-7711

Phone: 215-321-6012

Fax: 215-321-6067

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Last revised - December 30, 2005

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