This application addresses a wireless system for the determination of the height of liquid or molten metal levels containing metal, shaft, matte or slag in smelting furnace. Specifically, it addresses a wireless system that allows, without the presence of cables, the sending and receiving of a signal outside of the smelting furnace, in order to determine, on-line, the height of the phases, including the height of the slag-matte interface and the total level of the bath.

A fluid aspiration probe apparatus for automatic fluid testing equipment includes a pair of electrodes mounted on a distal probe tip. The electrodes are coupled to an impedance measurement apparatus via conductive pathways along the probe. The impedance measurements and probe tip height are monitored as the probe tip is lowered into a fluid sample. Boundaries between layers of fluid in the container are detected by recognizing sudden changes in the impedance measurements and heights of the boundaries are determined by tracking the position of probe tip when the sudden changes of impedance occur.

A liquid level sensing system for a vehicle tank may include a liquid level display including a display panel and a first number of visual indicators carried by the display panel. The system may also include capacitive sensors to be coupled to the vehicle tank to sense a second number of possible liquid levels being greater than the first number of visual indicators. In addition, the system may include a controller configured to drive the visual indicators in a modulation pattern based upon the capacitive sensors to thereby display a sensed liquid level having a resolution corresponding to the second number of possible liquid levels.

Methods and systems for sensing a fluid level associated with an engine are described. The method comprises generating an input signal and applying the input signal to a resistive portion and a capacitive portion of a fluid level sensing device, measuring a first varying output of the resistive portion of the fluid level sensing device through a first channel of a controller of the engine, measuring a second varying output of the capacitive portion of the fluid level sensing device through a second channel of the controller of the engine, and translating at least one of the first varying output and the second varying output into a level of fluid and outputting the level of fluid.

The present invention relates to an apparatus and a method for detecting a water level, which are capable of generating a water level detection signal which is alternating current output to a water level detection sensor by using two direct current control signals alternately output from a micom.

An example of an apparatus is provided. The apparatus includes a current source. The apparatus includes a conductor in electrical communication with the current source and a conductive fluid in a reservoir. The apparatus includes a first sensing rod to extend into the reservoir, wherein the first sensing rod has a first diameter. The apparatus includes a tip disposed at an end of the first sensing rod to interact with a surface of the conductive fluid. The tip has a second diameter over a first portion of the tip adjacent to the first sensing rod. The second diameter is smaller than the first diameter. The apparatus includes a sensor to detect an electrical signal between the conductor and the first sensing rod.

A level measurement system for conductive liquids including a liquid container (10) and at least three electrodes (18, 20, 22) arranged inside the liquid container (10) at different levels. The electrodes (18, 20, 22) are connected to a network including a plurality of resistor elements (R, R1, R2, R3, RP1, RP2, RR1, RR2). The network includes at least two input terminals (V+, GND) for applying an external voltage and at least two output terminals providing a voltage depending on the level of the conductive liquid in the liquid container (10). The level measurement system is provided for detecting at least three different levels of conductive liquids in the liquid container (10) and indicating the levels by one voltage value. The level measurement system may be used for water in a storage container such as in a domestic appliance having a liquid container for supplying the domestic appliance with liquid.

The present disclosure generally relates to liquid level meter, and more particularly, to a flexible multi liquid level measurement apparatus and method. There is a vast need in industry and water resource management to measure level of liquid in arbitrary shaped well and in tank contained more than one liquid. Ordinary methods are not capable to determine liquid level in said cases. This disclosure proposes a liquid level meter (910) which measurement apparatus (905) is flexible. The apparatus is capable to measure liquid level in an arbitrary shape well or tank (900) where the well or tank has filled with more than one liquid (915,920,925). The measurement apparatus and method disclosed here is completely digital at inventive subject matter level and doesn't affect by environmental noises and conditions.

A flood sensor for automation systems comprising at least two electrodes connected with a measuring circuit arranged to detect a plurality of liquid levels; and wherein the measuring circuit has a zero static current consumption, having current flow only in the presence of fluid; and wherein if a liquid is detected, the output of the circuit is activated and a microcontroller leaves a zero-power state in which it normally stays; and wherein the microcontroller comprises a program or programs stored in a memory and configured for being run by means of the microcontroller, wherein said programs comprise instructions for: (a) measuring the impedance of the liquid that has activated the output of the measuring circuit; and (b) sending the measured impedance to a central control.

A liquid level meter includes a first resistive temperature detector; a first temperature measuring body a liquid level detection section a temperature detection section detecting the temperatures of the first resistive temperature detector and the first temperature measuring body; a current control section determining a value of a current to apply to the first resistive temperature detector such that a difference between the temperatures of the first resistive temperature detector and the first temperature measuring body detected by the temperature detection section to be a first constant value; and a power supply unit supplying a current of the determined current value to the first resistive temperature detector; wherein the liquid level detection section determines whether the first resistive temperature detector is present in a liquid or outside of the liquid using the value of the current applied to the first resistive temperature detector.