초록 ▼

A system for determining remotely the distance from the bottom of a storage tank to the liquid-vapor interface of the stored liquid utilizing a pair of solid state electrical sensing elements whose electrical resistance varies as a function of element heat dissipation capable of providing continuous

A system for determining remotely the distance from the bottom of a storage tank to the liquid-vapor interface of the stored liquid utilizing a pair of solid state electrical sensing elements whose electrical resistance varies as a function of element heat dissipation capable of providing continuous extremely accurate digitally displayed measurement information referenced to the bottom of the tank even when the stored liquid and vapor are at the same temperature. The solid-state electrical interface sensing elements are affixed at the end of a vertically suspended motor driven cable disposed within the storage tank which is coupled to a DC pulse activated stepping motor and a master control circuit connecting the signal output of the sensing elements to the motor. The motor and cable system in conjunction with the control circuitry provide and drive the motor in stepping increments for continuously determining the liquid-vapor interface as referenced to the bottom of the storage tank. A remote digital display showing the quantitative values of the liquid-vapor interface level is provided. Scaling logic circuitry correlates the digital pulse counting technique in conjunction with a step-by-step movement of the probe assembly through the DC stepping motor.

대표청구항 ▼

A machine for determining the distance from the bottom of a storage tank to the liquid-vapor interface of a liquid stored therein comprising: a movable liquid-vapor interface probe in the storage tank, said probe including at least one electrically actuated medium sensing element; Pg,24 a drive mean

A machine for determining the distance from the bottom of a storage tank to the liquid-vapor interface of a liquid stored therein comprising: a movable liquid-vapor interface probe in the storage tank, said probe including at least one electrically actuated medium sensing element; Pg,24 a drive means including a cable, a motor means, and a motor control means; said cable at least partially extending into said storage tank, said cable connected to said probe; a measurement signal means; said motor means connected to said cable for lifting and lowering said cable and said probe within said storage tank, said motor means connected to said measurement signal means to provide at least one liquid-vapor interface position signal; said motor control means connected to said motor, means and said liquid vapor interferface probe; said measurement signal means connected to said motor control means for providing at least one liquid-vapor interface position signal; a sensing system connected to said cable for sensing the bottom of said storage tank, said sensing system connected to said motor control means and said measurement signal means to provide liquid-vapor interface position signal from the bottom of the storage tank.