초록 ▼

The invention provides a level sensing device for sensing the level of an electrically conductive liquid in a vessel or container, the level being determined both by visual observation of the level of the liguid in a sight glass which is in communication with the interior of the vessel, and by detec

The invention provides a level sensing device for sensing the level of an electrically conductive liquid in a vessel or container, the level being determined both by visual observation of the level of the liguid in a sight glass which is in communication with the interior of the vessel, and by detecting the level of the liquid in the sight glass by the use of an electrically conductive layer on at least one of the interior and exterior surfaces of the sight glass. The device provides a warning alarm when the level of the liquid drops below or exceeds a predetermined low or high level in the vessel.

대표청구항 ▼

A level sensing device for sensing the level of an electrically conductive liquid in a vessel or container, comprising a transparent tubular sight glass having a bore, a conduit for communication between the bore of the sight glass and the vessel or container, a transparent layer of a conductive mat

A level sensing device for sensing the level of an electrically conductive liquid in a vessel or container, comprising a transparent tubular sight glass having a bore, a conduit for communication between the bore of the sight glass and the vessel or container, a transparent layer of a conductive material applied to a selected one of the internal and external surfaces of the sight glass, a first conductor for electrical connection of the layer to an electric circuit, and a second conductor for electrical connection of the liquid to the electric circuit, the liquid and the conductive layer together constituting an electrical impedance in the electric circuit, the value of the impedance being variable in accordance with variations of the level of the liquid in the sight glass caused by variations of the level of the said liquid in the said container or vessel, said impedance being convertable by the electric circuit into an indication of the liquid level in the vessel or container.