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Device for monitoring the ink supply in ink recording devices

Image Number 2 for United States Patent #4196625.

A device for monitoring the supply of electrically conductive recording fluid in a supply container for ink recording devices and other recording devices utilizing recording fluid, employing electrodes which are wetted by recording fluid and a circuit arrangement which detects the electrical resistance between the electrodes and triggers a display device when the amount of recording fluid falls below a specific volume, in which a plurality of electrodes are provided within the supply container, two electrodes of which define therebetween a fluid-specific standard resistance, formed by the recording fluid, and two electrodes defined therebetween a resistance, formed by the recording fluid, which changes in dependence upon the level of the fluid, with at least those electrodes which detect the fluid-specific standard resistance being disposed in an area of the supply container which is constantly wetted by fluid.

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