| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 073299000 | Hydrostatic pressure type | 31 |
| 20080271527 | LIQUID LEVEL SENSOR WITH LEVEL ALARM - A liquid level sensor system actuated by a column pressure includes a hollow member having a distal open end adapted to be positioned into a liquid reservoir to a depth below a liquid surface level, and a sensor head unit. The sensor head unit is responsive to the column pressure to provide an indication of a liquid level in the reservoir. A low liquid level alarm circuit is responsive to the bellows member to generate a signal indicative of a low liquid level state. | 11-06-2008 |
| 20090007660 | Liquid depth sensing and identification system - The liquid depth sensing and identification system determines both the pressure head or depth, and therefore the quantity, of a liquid in a tank, as well as determining the characteristics of the liquid at the bottom of the probe. Two principles of operation are disclosed herein. The system may use a gas bubble collector about the outlet end of the purge tube, with the difference in height of the collector and purge tube mouths defining the very small difference in pressure head required to resolve the bubble emission characteristics produced in different liquids. Alternatively, the system incorporates a mass flow sensor capable of detecting minute changes in mass flow as bubbles are emitted from the purge tube in order to determine the type and characteristics of the liquid. The system operates using an open loop principle of operation, with no feedback provided to control the purge pump. | 01-08-2009 |
| 20090120182 | SUBMARINE SAMPLER - A flooded bin measurement system is provided that includes a submarine sampler for ascending and descending within a liquid of a bin and for measuring the depth of fluid at the submarine sampler's location. In one embodiment, the submarine sampler may ascend and descend along a vertical guide based on adjustments to it buoyancy compared with the liquid in the bin, which may be controlled manually and/or automatically. The measurement system may include a bubbler system for measuring hydrostatic pressure at the submarine sampler for determining its depth within the fluid of the bin. The submarine sampler may include a device having a hollow interior, an open bottom and an air supply line connected to the hollow interior. According to a further embodiment of the invention, the submarine sampler may be fixed to a line that is connected to a counterweight at its opposite end. | 05-14-2009 |
| 20100162812 | Liquid Level Monitoring Apparatus and Methods - The present invention relates to a liquid sensor for locating in a liquid. The liquid sensor includes a level sensor including one or more sensing stations located between a head and a tail of the liquid sensor. The liquid sensor is suitable for sensing the liquid level. The liquid sensor further includes a depth sensor for sensing the depth of the tail in the liquid. The liquid sensor is particularly suited to pumping station applications. | 07-01-2010 |
| 20100218601 | MULTIPHASE-LIQUID LEVEL DATA LOGGER - A multiphase-liquid level sensing system for sensing a layer depth and thickness of a liquid of a first phase that floats on a liquid of a different second phase includes an elongated stem that defines an elongated cavity. A float, which exhibits a sensible property, is disposed coaxially around the elongated stem and has negative buoyancy relative to the liquid of the first phase and positive buoyancy relative to the liquid of the second phase. A level sensor senses the sensible property and indicates a second phase liquid distance from the float to the bottom of the stem. An overburden sensor extends downwardly from the stem senses total liquid thickness of the liquid above the overburden sensor. A computational circuit calculates a layer depth and thickness of the liquid of the first phase, based on input from the level sensor and the overburden sensor. | 09-02-2010 |
| 20100242594 | BUBBLE COLUMN TYPE HYDROCARBON SYNTHESIS REACTOR, AND SLURRY LEVEL DETECTING METHOD - There is provided a bubble column type hydrocarbon synthesis reactor which synthesizes a hydrocarbon compound by a chemical reaction of a synthesis gas including hydrogen and carbon monoxide as main components, and a slurry having solid catalyst particles suspended in liquid. The hydrocarbon synthesis reactor includes a reactor main body which accommodates the slurry, a synthesis gas supplying section which supplies the synthesis gas to the slurry; one pressure sensor which is arranged higher than the liquid level of the slurry to measure the pressure of the synthesis gas above the liquid level, another pressure sensor which is arranged lower than the liquid level of the slurry to measure the pressure of the slurry, and a liquid level detecting device which detects a liquid level position of the slurry on the basis of measurement results of the pressure sensors. A plurality of the other pressure sensors are provided at arbitrary intervals in an axial direction of the reactor main body. | 09-30-2010 |
| 20100307236 | PRESSURE SENSOR FOR AN ELECTRIC HOUSEHOLD APPLIANCE AND ASSOCIATED METHOD - A pressure sensor including a body, device for receiving pressure associable with a tube connected to a fluid-filled tank of an electric household appliance, wherein the level of the fluid is to be measured. It further includes a device for emitting electric frequency signal proportional to the pressure received; a device carried aboard the body, on which a plurality of response frequency values emitted by the emitting means associated with corresponding pressure values at the pressure receiving means, were recorded. The pressure sensor is used with a pressure reading system carried by the device for receiving pressure. The pressure reading system includes two devices for reading values recorded on the pressure sensor, i.e. pressure and frequency values; and electric frequency signals. The pressure reading system further includes a processing device for interpolating the pressure value associated with every signal on the basis of the values read by the reading device. | 12-09-2010 |
| 20110000295 | REMOTE LEVEL GAUGE ADAPTED FOR LIQUID FUEL TANK - An apparatus for sensing a fluid level that, in one embodiment, is adapted to fit the threads of a fill pipe or vent cap in a storage tank. A first (or upper) part of the assembly is secured in an upper portion of the tank (such as is provided at a threaded vent opening) and includes components to permit sensing pressure at a first location. A second (lower) portion of the assembly sensing pressure at a second location is disposed in a weighted casing. The second portion is coupled to the first portion through a cable that carries a section of tubing. Circuitry disposed in the second portion receives a pressure indication from the upper portion through the tubing, and detects a fluid pressure at both the upper and lower portion of the tank. The difference between the two pressures is indicative of fluid level. This level is then sent back up to the electronics assembly in the first (upper) portion. The electronics assembly can contain a microprocessor and a radio transmitter, such as a cellular or other wireless data network transmitter, to report the fluid level to a remote station such as operated by a fuel supplier. In more particular aspects, the reports of fluid levels can be delayed until periods of significantly less change in fluid level or an indication that use of the tank as stopped, to save battery life. | 01-06-2011 |
| 20110041600 | WIPER ASSEMBLY FOR FUEL LEVEL INDICATION - A fuel level sensor includes a wiper support with metal wiper contacts. A rotatable shaft holds the wiper support and a seal assembly is provided in which the wiper support is disposed. The seal assembly includes a frame and a cover that are sealed together along respective peripheries with the wiper support being sandwiched therebetween. The shaft extends into and through an opening formed in the cover and is rotatable therein with a holder covering an end of the shaft and sealing the opening in cooperation with the cover. The frame is formed with a diaphragm above the wiper shaft that is deflectable to facilitate assembly and allow the sensor to compensate for pressure changes in a fluid tank in which the sensor can be disposed. | 02-24-2011 |
| 20110174070 | STORAGE TANK ASSEMBLY AND SYSTEM FOR STORING WASTE COOKING OIL - A storage tank and method for monitoring thereof is provided. The tank includes a first panel that defines a mounting surface for carrying a heating element. The heating element extends into the tank for heating liquids stowed therein. A sidewall interconnects the first panel and a spaced-apart second panel. A support extends from a bottom-facing surface of the second panel for supporting the tank in a spaced-apart relation from a nearby surface. The support further defines an upward-facing pocket for receiving a portion of the heating element. A control system may monitor the storage tank and alert a service provider of operative conditions thereof. | 07-21-2011 |
| 20120067119 | PRESSURE-SENSOR BASED LIQUID-LEVEL MEASURING DEVICE WITH REDUCED CAPILLARY EFFECT - A high efficiency diametrically compact, radial oriented piston hydraulic machine includes a cylinder block with a plurality of cylinders coupled to a first port by a first valve and to a second port by a second valve. A drive shaft with an eccentric cam, is rotatably received in the cylinder block and a cam bearing extend around the eccentric cam. A separate piston is slideably received in each cylinder. A piston rod is coupled at one end to the piston and a curved shoe at the other end abuts the cam bearing. The curved shoe distributes force from the piston rod onto a relatively large area of the cam bearing and a retaining ring holds each shoe against the cam bearing. The cylinder block has opposing ends with a side surface there between through which every cylinder opens. A band engages the side surface closing the openings of the cylinders. | 03-22-2012 |
| 20120103089 | Encapsulated liquid level sensor device - A method of encapsulating a liquid level sensor device within a protective monolithic block through over-molding a printed circuit board assembly supporting a plurality of electronic components and an external sensor that includes a pair of spaced apart sensor members extending from the protective monolithic block to sense the accumulation of condensate to a predetermined level within a collection reservoir from a condensate producing source within a polyamide adhesive. | 05-03-2012 |
| 20120131999 | PRESSURE SENSOR FOR AN ELECTRIC HOUSEHOLD APPLIANCE WITH ADDITIONAL SECURITY FUNCTION - A pressure sensor including: a casing fluid-tightly divided into a first and a second chamber by a deformable membrane and means for connecting the first chamber to the environment and the second chamber to a tank for an operative fluid of an electric household appliance for detecting the level thereof according to a deformation of the membrane upon the establishment of a differential pressure in the two chambers; wherein the membrane carries toward the first chamber a rigid disc operatively associated with a switch carried by the casing to either close or open the switch upon the deformation of the membrane beyond a predetermined entity. | 05-31-2012 |
| 20120174666 | WATER LEVEL MEASURING METHOD AND DEVICE - It is described a method and a device for measuring the water level in a water storage tank by means of a pressure measuring device comprising a pressure gauge, a pressurising bulb and a tubing. The pressure measuring device is provided in an enclosure and the tubing comprises an inner tubing coupling the pressure gauge and the pressurising bulb inside the enclosure, and an outer tubing having one end which is branched from the inner tubing and exits the enclosure. The other outer tubing end while joined to a dead weight is advantageously capable of being conveyed through an overflow or aerating tank piping to the bottom of the water storage tank. The enclosure protects the device against mechanical damage, dust and dirt, as well as moisture and light. This is particularly important in rural areas where life- and environmental circumstances leave much to be desired. | 07-12-2012 |
| 20120198928 | METHOD FOR REGISTERING THE FILLING POTENTIAL OF A WASTE CONTAINER OF MICROPLATE WASHING DEVICES - Method for registering filling potential of a waste container of a microplate washing device has a needle for aspirating liquids, a waste container, a pump for generating a partial vacuum and a pressure sensor for determining air pressure in the container, a sensor controller, and a first valve for blocking the line between the needle and the waste container. The pump and needle are connected to the container and the method includes closing the first valve, generating a partial vacuum in a test range, closing a further valve between the container and the pump, opening the first valve, triggering a partial vacuum dissipation in the container, measuring a test time for the partial vacuum dissipation in the test range, comparing the test time to a known threshold time, and deciding that the waste container is fillable or not. | 08-09-2012 |
| 20130042678 | DEVICE AND METHOD FOR DETERMINING THE FILL LEVEL OF A FLEXIBLE MEDICINE RESERVOIR - Included are systems and methods for determining a fill level of an inflow-less flexible medicine reservoir as a source for medicine, where the inflow-less flexible medicine reservoir has a monotonically decreasing fill level. Some embodiments of a device include a stop surface designed and arranged such that the stop surface contacts the inflow-less flexible medicine reservoir while the inflow-less flexible medicine reservoir is filled above a predetermined level. Similarly, some embodiments of the device additionally include a release detector that generates an output signal indicative of contact between the stop surface and the inflow-less flexible medicine reservoir being released and a processing unit for determining the fill level of the inflow-less flexible medicine reservoir from an output signal of the release detector. | 02-21-2013 |
| 20140033817 | LEVEL MEASUREMENT OF PROCESS FLUID USING A REMOTE SEAL - An apparatus is provided for measuring level of a process fluid in a container opening. The apparatus includes a remote seal configured to be inserted into the container through an opening and configured to receive a pressure related to the level of process fluid in the container. A capillary tube filled with a fill fluid extends from the remote seal to the opening and is configured to convey the pressure therebetween. A pressure sensor coupled to the capillary tube senses the pressure from the capillary tube and responsively determines the level of the process fluid in the container. The remote seal includes a bellows portion arranged to isolate the process fluid from the fill fluid in the capillary tube and convey the pressure therebetween. | 02-06-2014 |
| 20140157890 | Method And Apparatus In A Medium Source Of A Fire-Fighting System - Method for monitoring the amount of liquid of an extinguishing liquid container ( | 06-12-2014 |
| 20140196537 | INTEGRATED MEASURING APPARATUS FOR MEASURING VAPOR PRESSURE AND LIQUID LEVEL OF LIQUID TANK - A technique for measuring vapor pressure and liquid level of a volatile liquid contained in a tank. An integrated measuring apparatus sequentially measures vapor pressure and differential pressure by use of a single pressure sensor and a switching valve which switches between paths for measurement of the vapor pressure and the differential pressure. In addition, the integrated measuring apparatus includes a pressure sensor configured to sequentially measure vapor pressure and total pressure or the combination of the vapor pressure and liquid pressure; and a switching valve configured to be connected to a vapor pressure tube and a liquid pressure tube and switch between connection paths with at least one input port of the pressure sensor, wherein the vapor pressure tube is connected to an upper part of the tank and the liquid pressure tube is connected to a lower part of the tank. | 07-17-2014 |
| 20140196538 | LIQUID PRESSURE METER, LIQUID LEVEL METER, AND WARNING SYSTEM - A liquid level meter includes: an exterior portion having an internal space which a liquid to be measured flows in; and a pressure sensitive portion provided inside the exterior portion and having a pressure sensitive surface; wherein the exterior has holes that it is arranged on each of a vertically lower side and a vertically upper side relative to the pressure sensitive surface, and the holes connect an inside and outside of the internal space. | 07-17-2014 |
| 20140331762 | SENSOR DEVICE FOR DETECTING A LIQUID AND METHOD THEREFOR - The sensor device serves for detecting the absence or presence of a liquid ( | 11-13-2014 |
| 20150052997 | Hydrostatic Interface Measuring Device - An interface measuring device for ascertaining the height of an interface between a first phase ( | 02-26-2015 |
| 20150143898 | FLUID-LEVEL MEASURING SENSOR - A pressure sensor system for determining fluid level in a tank, includes a pressure sensor constructed to exhibit a force value corresponding to a sensed force, and a computer operatively coupled to the pressure sensor. A tank containing fluid is also includes and there is a communication link between the pressure sensor and the tank, thereby allowing determination of the level of fluid in the tank by calibration and interpretation of the force value exhibited by the pressure sensor. | 05-28-2015 |
| 073301000 | With electrically controlled indicator | 3 |
| 20100122575 | FLUID LEVEL INDICATOR STRIP - A fluid level indicator strip measures the level of water in a closed receptacle containing a volume of fluid within an impermeable liner. The strip is a flexible, thin and impermeable elongate strip having a first pressure sensing part disposed vertically within the receptacle on the surface of an inside wall and a second visual display part disposed on the same wall outside surface. The first and second parts are connected by a third horizontal part. Each pressure sensor is electrically connected to a direct opposite and corresponding visual display. In one embodiment the pressure sensors are piezoresistive. In another embodiment the visual displays are LEDs. | 05-20-2010 |
| 20150082882 | SYSTEM FOR DETERMINING THE LEVEL OF A LIQUID IN A CONTAINER - A system for determining liquid level in containers. According to one embodiment, the system is configured for use with a single container. The system includes a tube having a distal branch and two proximal branches. The distal branch is sized to extend from inside the container to a remote location. One proximal branch is coupled to a pressure transducer for emitting a signal in response to the sensed fluid pressure head in the container, and the other proximal branch is coupled through a check valve to a gas displacement device used periodically to blow debris from the distal branch. A processor coupled to the transducer uses the fluid pressure head signal to determine the liquid level. A display coupled to the processor displays the determined liquid level. In another embodiment, the system may be used to determine the liquid level in any, some, or all of a plurality of containers. | 03-26-2015 |
| 20150316063 | Sump Pump Remote Monitoring Systems and Methods - Systems and methods for sump pump remote monitoring can include control circuitry integrated into a portable housing, with a backup sump pump connected to the control circuitry. The control circuitry can be powered by a line power and when the line power is not available, the control circuitry can be powered by a battery power. The control circuitry can be connected to a control panel, and the control circuitry can include a pressure transducer, the pressure transducer to measure a pressure in a fluid level sensor, and based on the measured pressure, the control circuitry to adjust the speed of the backup sump pump. A wireless controller can be connected to the control circuitry, the wireless controller for wirelessly receiving monitoring instructions and wirelessly transmitting backup sump pump status data, with the control circuitry providing an indication of the backup sump pump status data to the control panel. | 11-05-2015 |
| 073302000 | With fluid displacement or replenishment | 5 |
| 20110113877 | HIGH CONTRAST CAPILLARY DEPTH GAUGE AND WATCH INCLUDING THE SAME - Capillary depth gauge ( | 05-19-2011 |
| 20130145841 | LIQUID LEVEL DETERMINATION SYSTEM - A liquid level determination system comprises pressure determination components that include an interference dampener to mitigate interference originating from a bubbler air compressor. The system may include a pressure pipe with a pressure sensing pipe end located adjacent to the pressure determination components and a bubbler pipe end locatable at least partially in a wet well. The wet well may include a pump that has a volute. The pressure pipe may further comprise layered pipe sections, and the position of the bubbler pipe end may be calculated so that it is not lower than a level substantially equivalent to a center line through the volute. The bubbler air compressor may provide air pressure to the pressure pipe. | 06-13-2013 |
| 20140053645 | FUEL QUANTITY MEASUREMENT - The present invention provides a method, device and apparatus for determining a quantity of fuel within a fuel tank having a drain valve penetrating a lower boundary of the fuel tank. The method includes inserting a pressure measurement probe having a pressure sensor into the drain valve to permit contact between the pressure sensor and fuel within the tank, and measuring a pressure of the fuel with the pressure sensor. The measured pressure is used to determine the quantity of fuel within the tank, e.g. by consulting look-up tables comprising data indicating the relationship between measured pressure and fuel quantity, or by using one or more conversion equations. | 02-27-2014 |
| 20140083185 | Multi-tank indirect liquid-level measurement - A multi-tank indirect liquid level measurement device and method are disclosed. The device and method may be implemented using a sealable reservoir that holds an indicating liquid and pressurized air, a pump that supplies and/or pressurizes the air in the reservoir, a plurality of pipes each of which connect on one end to the tanks to be gaged and on their other ends to a valve for selectively and exclusively connecting to the pressurized air, and a manometer tube that displays the pressure difference between the sealable reservoir and atmospheric pressure as a height reading of the indicating liquid. | 03-27-2014 |
| 073303000 | Suction type or vacuum tank action | 1 |
| 20150114105 | MILK LEVEL MEASUREMENT DEVICE AND RELATED MEASUREMENT METHOD - A device arranged for measuring a level of a liquid in a container. The device has a sensor, arranged to sense a pressure of a liquid in a tube, a pump arranged to pump the liquid from the container through the tube, and a valve located along the tube between the sensor and the pump and arranged to impede back flow of the liquid into the container when the pump stops pumping the liquid. The device is arranged to measure the level of the liquid into the container on the basis of the hydrostatic pressure measured by the sensor after each stop of the pump. Also disclosed is a method for measuring a level of a liquid in a container by a pressure sensor. | 04-30-2015 |
