Apparatus for the electric level control of a developing solution in a storage tank
AssigneeHoechst Aktiengesellschaft
InventorMartin Junghanns
Life of this patent
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Abstract
Apparatus for monitoring the level of a developing solution within a storage tank utilizing at least two electrodes having active surfaces exposed to the developing solution for the conduction of electrical current therebetween. The electrodes have their active surfaces positioned at different levels within the developing solution. One electrode serves as a reference and is always immersed in the developing solution. Electrical signals developed when the developing solution falls below the level of the active surface of the electrodes is utilized to trigger an electrical switching circuit which is connected to the electrodes for governing a signalling and/or control action of the developing station.
Claims6
An apparatus for monitoring the level of a developing solution contained in a storage tank and used for developing in a development device comprising:
- electrodes positioned inside said storage tank,
- said electrodes having active surfaces positioned at different levels in said tank and exposed to the developing solution for the conduction of electrical current,
- at least one of said electrodes having its active surface positioned at a level height of the developing solution at which a signalling action is started, and another one of said electrodes having an active surface substantially always positioned, when operative, within said developing solution thus serving as a reference electrode,
- an elongated body member having an insulating circumferential material thereon, at least said non-reference electrodes being annular and spacedly disposed around said elongated body member, and
- an electric switching circuit connected to said electrodes for triggering the signalling action as a function of the electric resistance between the electrodes.
Dependencies are inferred from the claim text.