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| Number | Title | Issue Date |
| 8096178 | Apparatus for capacitive ascertaining and/or monitoring of fill level An apparatus for capacitive ascertaining and/or monitoring of the fill level of a medium in a container. The apparatus includes at least one probe unit, which is electrically insulated relative to the medium, and at least one electronics unit, which supplies the pro... | 01/17/2012 |
| 8047073 | Capacitive liquid level detector for direct methanol fuel cell systems A capacitive liquid level detector for detecting a liquid level of a liquid in a receptacle, the liquid being conductive, the detector comprising: a capacitor with a first plate having a fixed size and being insulated from the liquid, and a second plate being formed... | 11/01/2011 |
| 7997132 | Capacitive sensor assembly for determining relative position A capacitive sensor assembly for detecting relative movement or position between objects, such as liquid level in a tank or reservoir, movement of one machine component with respect to another, and so on, includes one or more antenna probes connected to an integrate... | 08/16/2011 |
| 7963164 | Capacitive sensor assembly for determining level of fluent materials A capacitive sensor assembly for measuring a level of fluent material in a container includes an electronics section for receiving and processing signals and an antenna probe operably associated with the electronics section. The antenna probe has an electrical condu... | 06/21/2011 |
| 7908920 | Velocity-of-propagation fluid level measurement method An apparatus for determining a level of a liquid in a tank is provided. The apparatus comprises a probe and electronics. The probe passes into the tank and is immersed in the liquid. The probe includes a fiducial in spaced relation with a distal end. The electronics... | 03/22/2011 |
| 7905145 | Capacitive gauge for fuel tank Capacitive gauge for fuel tank comprising a measurement capacitor, a reference capacitor and at least one standard capacitive device, fed by and connected to an electronic interpretation circuit comprising switches for charging and discharging the capacitors and the... | 03/15/2011 |
| 7895891 | Gas/liquid separator comprising a capacitive level sensor The invention relates to a gas/liquid separator comprising a capacitive level sensor, which is particularly suitable for systems that employ reduced volumes of fluids at high pressures. The inventive separator includes a metal part comprising a borehole which is clo... | 03/01/2011 |
| 7891243 | Sensor for the contactless detection of the level of a liquid and adhering high-conductivity medium, especially blood, through a non-metal wall of a container The invention relates to a sensor for the contactless detection of the level of a liquid and adhering high-conductivity medium, especially blood, through a non-metal container wall. The sensor has a pulse generator (1) that generates brief pulses which, via a... | 02/22/2011 |
| 7878058 | Fluid monitoring apparatus and method A fluid monitoring apparatus and method is disclosed for use in an underground utility vault. Specifically, a system utilizing multiple sensors to determine the total amount and type of fluid present in a utility vault is disclosed. A first sensor located above the ... | 02/01/2011 |
| 7845224 | Liquid level sensor and liquid level estimation method A sensor for detecting a liquid level, including a measurement capacitor, a reference capacitor, an integrating capacitor, a calibration capacitor, a controller, an amplifier, a comparator, and a complementary calibration capacitor. The controller implements operati... | 12/07/2010 |
| 7836763 | Method and apparatus to reject electrical interference in a capacitive liquid level sensor system Methods, systems, and computer program products for measuring a capacitance between a probe and a liquid, pausing movement of the probe based on a rate of change of the capacitance, further measuring the capacitance while the probe is paused, and, based on the furth... | 11/23/2010 |
| 7836762 | Apparatus for weighing liquid in a bottle, in particular a pharmaceutical bottle An apparatus for weighing liquid in a bottle, in particular a pharmaceutical bottle. The apparatus has at least one measuring cell, and a conveying device for feeding a number of bottles through the measuring cell along a path. The apparatus is characterized in that... | 11/23/2010 |
| 7827862 | Flexible guided wave level meter probe The invention is a level meter having a flexible probe. The flexible probe includes a flexible conductor and at least one flexible band shield member disposed in a substantially vertically parallel relationship with the conductor, where the conductor and the shield ... | 11/09/2010 |
| 7814787 | Combined oil level or condition sensor and sight oil level gage The invention provides an oil level or condition sensor featuring a housing and a baffle or plate arrangement arranged in the housing, where the baffle or plate arrangement forms a capacitor when the housing is filled with oil, the baffle or plate arrangement being ... | 10/19/2010 |
| 7814789 | Device for determining and/or monitoring the fill-level process variable of a substance in a container The invention relates to an apparatus for determining and/or monitoring the process-variable fill-level of a fill substance in a container. The apparatus of the invention is to satisfy high demands with respect to chemical resistance and/or cleanability, while permi... | 10/19/2010 |
| 7814788 | Liquid level sensor An apparatus and method for determining the level of liquid in a container in an analytical instrument, typically an automated analytical instrument in a laboratory. The apparatus comprises: (a) an electrically conductive support; | 10/19/2010 |
| 7802471 | Liquid level sensing device and method A liquid level sensor device (10) includes a liquid level sensor element (14), a capacitance-to-voltage converter (16), and a controller (18). The liquid level sensor element (14) comprises (i) at least two sets of N conductive ele... | 09/28/2010 |
| 7712364 | Fluid level measuring device for a beverage dispenser A level sensing apparatus and method of use for use with a beverage server to indirectly sense the level of beverage retained in the server. The server having a body for receiving and retaining beverage with an opening in the body for receiving the level sensing app... | 05/11/2010 |
| 7698940 | Apparatus for determining and/or monitoring the fill level of a medium in a container A device for determining and/or monitoring the fill level of a medium in a container, including: a first conductive element; a second conductive element; and a sealing ceramic. The sealing ceramic being arranged in a region between the two conductive elements, for t... | 04/20/2010 |
| 7628067 | Electrode rod for detecting water-level, method of detecting water-level, method of controlling water-level in a boiler, and method of controlling water-level in a steam separator An insulating coating formed of engineering plastic with high-heat resistance, high-pressure resistance, and chemical resistance is formed on a surface of a water-level detecting electrode part of an electrode rod for detecting water-level attached to penetrate a me... | 12/08/2009 |
| 7624634 | Environmental-state determination apparatus An environmental-state determination apparatus includes a pair of detection electrodes which provide therebetween a capacitance which changes in accordance with a state of a surrounding environment, for example, the level of a liquid. A detection signal is input to ... | 12/01/2009 |
| 7610805 | Combination capacitive proximity sensor and ultrasonic sensor for material level monitoring A material level detection sensor (10) having a continuous ultrasonic sensor (12) and a capacitive proximity sensor (13). The capacitive proximity sensor detects the material only when the material is at or within the dead zone (15) of th... | 11/03/2009 |
| 7603899 | Apparatus and method for detecting liquid level with a probe The present application discloses a method and apparatus for detecting liquid level with probe, and the method comprising steps of: (A) acquiring a capacitance value of the probe; (B) generating an analog signal corresponding to the acquired capacitance value; (C) c... | 10/20/2009 |
| 7600424 | Liquid condition sensing apparatus Capacitive liquid condition sensing apparatus includes a pair of a 1-1 electrode and a 1-2 electrode arranged to form a first capacitance; a pair of a 2-1 electrode and a 2-2 electrode arranged to form a second... | 10/13/2009 |
| 7571646 | Electronic liquid level sensor A pair of wires are coated in a conductive plastic sheath, and then imbedded in the inside of a plastic tube. The tube can be dropped down an oil well casing below the fluid level. A DC power source is applied across the wires, and current flows across the inside of... | 08/11/2009 |
| 7533567 | Capacitance fuel volume measuring apparatus for fuel cell A capacitance fuel volume measuring apparatus for a fuel cell is disclosed. The apparatus utilizes two electrode boards disposed in a fuel tank and an elastic element to perform calculation of the fuel volume in the fuel tank. The apparatus includes a structure disp... | 05/19/2009 |
| 7509856 | Capacitance sensor for detecting the fill level of a medium in a container A sensor according to the invention has an amplifier that is capacitively loaded vis-à-vis the ground by a container and by a medium contained therein and that has a capacitive feedback that is dimensioned in such a way that the amplifier only oscillates when the c... | 03/31/2009 |
| 7441455 | Apparatus for measuring and indicating the level and/or volume of a liquid stored in a container The present invention refers to an apparatus for measuring the level and/or volume of a liquid stored in a container. The apparatus comprises at least one pair of electrodes mounted in the interior of the container in such a position that said electrodes are partial... | 10/28/2008 |
| 7432725 | Electrical field sensors for detecting fluid presence or level The present disclosure provides several systems. In general, it provides E-field sensor systems that utilize at least one electrode 100 adapted for creating an E-field in an area 210 within a detection volume where fluid presence 400 or presence... | 10/07/2008 |
| 7427844 | Switch assembly, electric machine having the switch assembly, and method of controlling the same A pump assembly for pumping a liquid and a method of controlling the pump assembly. The pump assembly includes a motor coupled to a pump, and an electronic switch assembly electrically connected to the motor to control the current through the motor. The electronic s... | 09/23/2008 |
| 7423436 | Capacitive level measurement and detection device using high frequency voltage A device for measurement and detection of the level of a medium in a container with a sensor element, with a reference element and an electrical circuit which contains at least one AC voltage source and an evaluation unit, the sensor element and the reference elemen... | 09/09/2008 |
| 7421896 | Variable frequency charge pump in capacitive level sensor A method of determining a fluid or material level. The method comprises the steps of: providing, at a first frequency, a current operatively capable of changing a capacitor; charging at least first and second capacitive devices to a predetermined voltage using the p... | 09/09/2008 |
| 7415366 | Electronic field device with a sensor unit for capacitive level measurement in a container A field device electronics with a sensor unit for capacitive fill level measurements in a container, wherein the field device electronics is connected over appropriate signal paths with the sensor unit, wherein the field device electronics produces a voltage signal ... | 08/19/2008 |
| 7414414 | Spatially distributed guarded impedance A guarded sense impedance for use in a measurement instrument includes a sense impedance adapted to have a spatially distributed electrical potential and at least one guard structure adapted to have the spatially distributed electrical potential. The guard structure... | 08/19/2008 |
| 7401513 | Electronic method and system for detection of conducting or dielectric medium with dielectric constant higher than that of air The method of detecting the presence of a conducting or dielectric environment with dielectric constant higher than that of air, of this invention, consists in counting the number of control signals (No), resulting from the relationship No=f(Qp, Qod, Ucc, Up, T), se... | 07/22/2008 |
| 7395559 | Swimming pool water level controller A water level controller for a pool has a water level sensor immersed in the pool. A processor detects if the sensor senses low water. A transmitter sends a radio frequency signal to a receiver if the processor detects the low water. The receiver turns on a valve to... | 07/08/2008 |
| 7378857 | Methods and apparatuses for detecting the level of a liquid in a container A method for detecting the level of a liquid in a container. The method includes applying a predetermined voltage to a level measuring electrode, disposed within the container, for a predetermined first period of time; then, discontinuing the application of the volt... | 05/27/2008 |
| 7373817 | Solid state fluid level sensor A sensor system for sensing liquid level in a bilge, for use in automatic bilge pump actuation. First and second field effect sensors are potted or sealed within a container or the bilge wall and are aligned in a vertical array and each comprise a substantially plan... | 05/20/2008 |
| 7370528 | System for detecting the level of liquid in a tank The detecting system comprises a detecting circuit (1) made up of a transistor (T1) in current generator configuration, connected in series with a resistance (Rs) and a capacitor (13) of known capacitance (Cx), the resistance Rs representing the... | 05/13/2008 |
| 7369055 | Water softener monitoring system A system for monitoring the level or amount of a material within a container is provided. The system includes a detection mechanism that can be a direct detection mechanism or any of a number of indirect detection mechanisms. When the detection mechanism senses an u... | 05/06/2008 |
