초록 ▼

Apparatus for determining the liquid level in tanks, such as are used in recreational vehicles, which utilizes a pair of parallel plates secured to the outside of the tank to avoid contact with the liquid inside of the tank. The change in capacitance between the plates as a function of liquid level

Apparatus for determining the liquid level in tanks, such as are used in recreational vehicles, which utilizes a pair of parallel plates secured to the outside of the tank to avoid contact with the liquid inside of the tank. The change in capacitance between the plates as a function of liquid level is utilized to generate an electrical signal indicative of liquid level. With the present invention, more than one tank can be connected to the same measuring electronics and the measuring electronics may be mounted at a central point, adjacent the liquid level visual indicator. The present apparatus is relatively independent of variations in conductivity of the liquid in the tank and relatively independent of operating frequency. The apparatus is relatively unaffected by the capacitance of long cables between the plates and the measuring electronics.

대표청구항 ▼

Apparatus for determining the liquid level in a tank comprising: a pair of parallel electrode plates secured to the outside surface of said tank with a generally vertical orientation so that as the lIquid rises in said tank, an increasing area of said plates is adjacent said liquid whereby the capac

Apparatus for determining the liquid level in a tank comprising: a pair of parallel electrode plates secured to the outside surface of said tank with a generally vertical orientation so that as the lIquid rises in said tank, an increasing area of said plates is adjacent said liquid whereby the capacitance between said plates increases as the liquid level in said tank increases; means for generating an AC voltage; means for coupling said AC voltage to one of said electrodes; amplification means having an input and an output; means for coupling the other of said electrodes to said input of said amplification means; and indicator means operatively coupled to said output of said amplification means for providing an indication of the liquid level in said tank.