초록 ▼

A storage installation which is capable of storing a variety of materials, both conductive and non-conductive, includes a level sensing device disposed entirely externally of the container for the material such as to the exterior of the walls thereof. The sensing device includes an elongated strip o

A storage installation which is capable of storing a variety of materials, both conductive and non-conductive, includes a level sensing device disposed entirely externally of the container for the material such as to the exterior of the walls thereof. The sensing device includes an elongated strip of metal preferably copper or brass cut to the length of the container when arranged in a vertical direction therefor and applied to the exterior of the container by suitable adhesive material. The sensing element serves as a capacitor component in an oscillator circuit which is arranged whereby the electrostatic field emanating from the sensing strip will change the oscillator amplitude proportional to the level of the material in the container. The detected changes in amplitude in the oscillator circuit will produce a DC level proportional to the level of the oscillator amplitude. The DC level in turn will be processed by a remote indicator circuit to drive a readout meter, bar graph or digital unit.

대표청구항 ▼

A level sensing system for use with a storage container constructed of low dielectric constant material holding a stored medium, the level of which is to be sensed to determine the quantity of the medium therein, said level sensing system comprising: a single, unitary conductive sensing member adapt

A level sensing system for use with a storage container constructed of low dielectric constant material holding a stored medium, the level of which is to be sensed to determine the quantity of the medium therein, said level sensing system comprising: a single, unitary conductive sensing member adapted to be arranged on the exterior of the container along the height of such container for a distance corresponding to the level of the stored medium to be sensed, means for securing the sensing member to the container exterior surface, and circuit means having a source of electrical power connected to said sensing member for energizing said sensing member and effecting an electrostatic field therefrom, whereby said field emanating from said sensing member will vary in accordance with the level of the medium in the container, and wherein said circuit means further includes means for sensing variations of said electrostatic field, and means for indicating the level of the medium in the container responsive to such variations, wherein said circuit means includes an oscillator detector circuit with a variable amplitude output, and wherein said sensing member is associated with said oscillator detector circuit as a capacitor component thereof such that variations in said electrostatic field are adapted to correspondingly vary the amplitude of said output of said oscillator detector circuit, wherein a change in the amplitude of the output of said oscillator detector circuit indicates a change in the level of the stored medium.