Tag level switches are designed to detect the presence of different materials accrued in the surroundings of the electrode’s position. Materials can be any fluids, semi-fluids, powders and granules, conductive or non-conductive, grains, powders, plastic raw materials, oils and water. The electrode can be installed in free air or closed vessels. Vessels may be metallic or non-metallic pipes or reservoirs. Any material adhering to it does not affect the function of the sensing unit.
Some of the principals on which the Tag units function are changes of RF current and voltage, loss of energy and changes of dielectric constant versus air (disregarding capacity). RF is transferred from the feeler through the mass of the material to ground point of the sensing unit. This causes RF energy losses. The variations of RF current are transformed to DC and thus reach the control box. The amplifier in the control box activates the relay which incorporates dry contacts. The set will continue to work properly even if the feeler is totally covered by material.
After initial fitting of the unit, no further adjustment is required. The Tag level switches do not require maintenance and offer a truly fit-and-forget solution.
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