Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A system for providing different versions of a modularly structured apparatus for determining a physical process quantity, wherein at least two devices to be generated from the system are based on different measuring principles, including a number sensor units (41-48), each sensor unit being designed for detecting a determined physical measuring quantity and for converting said measuring quantity into an electrical measuring signal, wherein at least two of the sensor units are distinguished from each other by their underlying measuring principles; at least one evaluation unit (10), adapted to connect to the sensor units, for evaluating and generating a process quantity signal representing the physical process quantity from the measuring signal of a sensor unit; at least one output unit (13) for outputting the process quantity signal; at least one voltage supply unit (16); and at least one housing unit (22-24) configured to accommodate at least the evaluation unit.

Abstract: This invention relates to a controller for a pumping installation using a combined pressure sensor and fluid level sensor arrangement. The controller includes a processor responsive to measurements from the sensor arrangement, as well as memory for storing a set of instructions for execution by the processor to correlate initial measurements taken by the sensors. The instructions allows the controller to monitor a fluid level in a well with the combined arrangement to compile a history of respective measurements for both sensors, and, in the event of an unexpected discrepancy between the measurements, to automatically calibrate the sensor arrangement according to the history of respective measurements to re-establish a correlation between the sensors.

Abstract: 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.

Abstract: Described herein is a device for detecting a physical variable for a process fluid via differential measurement, comprising a pressure transmitter having a main body, provided with a pressure sensor and a first pressure-sensitive element and a second pressure-sensitive element operatively connected to the pressure sensor. The device moreover comprises a first remote separator, designed to be positioned in a first detection position, and a second remote separator, designed to be positioned in a second detection position.

Abstract: A method and apparatus for measuring the mass of liquid within collapsible, bulk fabric storage containers is provided wherein a deflection member arranged in a grid pattern supports the container and undergoes deflection creating an increase in the pressure of fluid within its interior which may be measured and correlated to the mass of the liquid within the container.

Abstract: A portable diving apparatus, which comprises: (a) a water proof casing which comprises an external key pad; (b) a portable computing device within said water proof casing, said portable computing device comprises a diving module; (c) a pressure sensor which is mounted at least partially outside said water proof casing; (d) an adaptor within said water proof casing for receiving key pad entries from said key pad by means of first cable, and pressure indications from said pressure sensor by means of third cable, and for converting said key pad entries and said pressure indications to key pad data and pressure data respectively in a standard communication protocol, and transferring said data in said (wired or wireless) standard communication protocol into said portable computing device, wherein at least said pressure indications are processed by said diving module of said portable computing device and displayed as diver information on a display of said portable computing device.

Abstract: The present invention is directed to a system for determining a fluid level in a vessel. The system comprises a first differential pressure transducer, a second differential pressure transducer, a pressure delivery system, and a fluid passage. The first differential pressure transducer includes a first side and a second side. The first side is selectively in fluid communication with a portion of the vessel above the fluid level. The second differential pressure transducer includes a third side and a fourth side. The third side is selectively in fluid communication with a portion of the vessel below the fluid level. The fluid passage is in fluid communication with the second side of the first transducer, the fourth side of the second transducer, and the pressure delivery mechanism.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: The disclosed apparatus includes a condensing chamber (CC) that maintains a volume of a condensate obtained from vapor emitting from a vessel, for example a reactor pressure vessel (RPV). The condensing chamber is connected to a reference leg (RL), a variable leg (VL) and a vapor or steam leg (SL). RL connection provides a flow path for the CRD drive water system backfill to flow into the CC and overflow into the VL. The excess backfill and/or condensate will be returned to the vessel, typically at a point below the liquid level within the vessel. Non-condensable gases will thereby be returned from the CC to the RPV in a substantially continuous manner, thereby tending to prevent the introduction of non-condensable gas enriched liquid from the CC into the RL and improving the tolerance and reliability of the level measurements and/or reducing thermal stresses on the various CC connections.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: Dynamic monitoring of the amount of fuel remaining in an aircraft fuel tank is effected by delivering a constant volume flow of an inert gas into the fuel through the respective open distal ends of a sensor conduit tube and a reference conduit tube, each of which extends from a proximal end exterior of the tank to its respective distal open end located within the fuel tank. The sensor conduit tube distal end is fixed closely proximate the bottom of the tank, and the reference conduit tube distal end is fixed proximate but at a vertical spacing h from the sensor conduit tube distal end. The pressure at which the gas is delivered into the fuel at the constant volumetric rate through each of the sensor and reference conduit tubes is monitored. The pressure difference between the monitored pressure in the sensor conduit tube and the pressure in the free space in the fuel tank above the surface of the remaining fuel is directly proportional to the weight of the fuel lying above the sensor conduit tube distal end.

Abstract: 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.

Abstract: 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.

Abstract: 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 flow restrictor is positioned to dampen instantaneous differential column pressure changes presented to the bellows member while permitting steady state column pressure to be communicated to the bellows member.

Abstract: 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.

Abstract: A method of and apparatus for measuring a level of a liquid stored under pressure in a reservoir ensure that the level is measured precisely even when a carrier gas is bubbled through the liquid. A tube extends in the reservoir such that a lower end of the tube is immersed in the liquid and that the liquid occupies a portion of the tube, and a first gas that is insoluble in the liquid is sealed in the upper portion of the tube. A detecting unit detects changes in density of the insoluble gas as the level of the liquid changes. The apparatus is employed in a deposition apparatus where the liquid is used to produce a source gas for forming a layer on a substrate. A carrier gas, bubbled through the liquid in the reservoir, transports gas produced from the liquid to a process chamber in which the deposition process takes place.

Abstract: A method of determining a temperature and a pressure in a tank is provided. The method comprises the steps of obtaining sensor data and calculating coefficients. Then, a bridge resistance is ratiometrically determined from a bridge voltage. A temperature is calculated with the coefficients and the bridge resistance. Thereafter, a transition from a temperature measurement mode to a pressure measurement mode is made. A voltage per resistance is calculated with the coefficients and a differential voltage. Then, a normalized voltage is calculated using the voltage per resistance, the differential voltage, and the bridge resistance to indirectly compensating for temperature. A pressure is calculated with the coefficients and the normalized voltage.

Abstract: A method and device which provides visual means to confirm the level of liquid in an opaque container, by operating an adjacent transparent gauge tube which is in correspondence with the liquid on the inside of container, notwithstanding the pressurized condition of the liquid, while maintaining the pressure above the liquid in the gauge tube at the same level as the pressure above the liquid in the container.

Abstract: 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.

Abstract: A biological specimen collection and transfer system, comprises a biological sample container configured for storing a biological fluid sample, and a fluid level regulator configured to determine a fluid level in the biological sample container and to dispense a fluid into the container if the determined fluid level is less than a desired fluid level. A method of regulating a fluid level of a biological fluid sample in a container during a process of transferring biological matter in the fluid sample to a specimen slide, the method comprises monitoring a pressure of an interior chamber of a specimen filter, the chamber coupled to a vacuum source and having one end submerged in the fluid sample, determining a fluid level of the fluid sample in the container based on a detected change in pressure of the specimen filter chamber, and adding a liquid to the container if the determined fluid level is less than a desired fluid level.

Abstract: 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.

Abstract: The depth measuring device for a diving watch with a chronograph mechanism, includes a plunger moved by external pressure through a rolling membrane against the action of a return element. The plunger acts on cams belonging to a circular slide mounted in a casing ring. The movement of the slide is transmitted by a gear train to a depth needle and to a dead needle. A pressure sensing device has a sliding plunger mounted inside the winding button. This plunger acts on a control device for automatically starting and stopping the chronograph mechanism. A locking device is used to lock and release the control device and displays a diving flag in the released position. The gear chain displays a safety flag at a predetermined depth. A resetting device allows the various mechanisms and devices to be reset to zero.

Abstract: 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.

Abstract: 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.

Abstract: A fuel tank is allowed to hold any of types of liquid fuels and currently hold one type of liquid fuel. A light emitting element outputs a light beam of a predetermined emission spectrum to the liquid fuel of the fuel tank. The liquid fuel changes the light beam to a reflected light beam of a reflection spectrum according to spectral characteristics of the liquid fuel. The reflection spectrum is peculiar to the type of the liquid fuel of the fuel tank. A light receiving element detects the reflection spectrum, and a control circuit receives the detected reflection spectrum from the light receiving element. The control circuit collates the detected reflection spectrum with a referential reflection spectrum corresponding to each fuel type and identified the type of the liquid fuel of the fuel tank according to a collation result.

Abstract: A tank level detection apparatus for indirect measurement of a liquid level in a tank is disclosed. The apparatus includes a second liquid at least partially stored in a reservoir and a one-way valve, which communicates between the reservoir and the tank. A sensor is used to determine a physical characteristic of second liquid from which the level of the liquid in the tank can be determined.

Abstract: A method and system for determining the level of fuel contained in the tank of a motor vehicle includes a fuel pump disposed in the tank for creating a flow of fuel in the tank. An elongated tube is placed vertically in the tank. The system also includes a venturi tube coupled between the fuel pump and the elongated tube for creating a vacuum as a result of a portion of the flow of fuel therethrough from the fuel pump thereby drawing fuel vapor from the elongated tube at a varying pressure, the pressure decreasing as the amount of fuel vapor in the tank increases. A controller is coupled to the elongated tube for determining the level of fuel in the tank based on the pressure.

Abstract: Water measurement auto-networks and methods of operation are disclosed herein. An exemplary method may include determining a water level at a first water measurement station in an auto-network. The method may also include reducing power to at least a transmitter at the first water measurement station to conserve battery power during an inactive state. The method may further include increasing power to the transmitter only at predetermined times to communicate the water measurement data to a second water measurement station in the auto-network.

Abstract: A detection apparatus for use in a vessel for measuring a fluid includes a tubular connected to a housing containing sensors, wherein the housing includes a top, a bottom, and a hole disposed in the top of the housing. The housing containing sensors includes an outer surface and a sloped inner surface sloping from the outer surface toward a central axis of the housing and intersecting with the hole. In one embodiment, two or more housing containing sensors can be included with detection apparatus. A pressure sensor, having a diaphragm flush mounted in the sloped inner surface, can be disposed in the hole. Signaling device can be disposed in the hole for communications between the sensors and a processor. The processor receives data from the sensors and converts the data to values for transmission to an auxiliary device.

Abstract: An optical hydrophone for measurement of the acoustic pressure distribution in a fluid medium has a light source that illuminates an area of a boundary region between an optically transparent body and the fluid medium. A light receiver measures the intensity of the light reflected from the illuminated area as a measurement of acoustic pressure, due to changes in the index of refraction of the fluid medium that are caused by the acoustic pressure. The illuminated area is smaller than the boundary surface formed between the optically transparent body and the fluid medium, thereby giving the hydrophone a longer service light and a high spatial resolution capacity.

Abstract: The present invention proposes an electronic dive watch (10) including a water resistant case (12) containing a watch movement (15) on which there is mounted a dial (16) provided with at least one first and one second coaxial hand (18, 20), each hand (18, 20) being driven independently by an associated motor (32, 34), of the type wherein the watch movement (15) includes an electronic circuit (30) that controls the first and second hands (18, 20) in accordance with a first operating mode in which each hand (18, 20) indicates a distinct item of data and in accordance with a second operating mode, called the dive mode, in which at least the first hand (18, 20) indicates an instantaneous depth value (Pi), characterized in that, in the dive mode, the first and second hands (18, 20) are controlled such that they simultaneously indicate the same instantaneous depth value.

Abstract: The weight of liquid in a tank subject to tilting is determined by measuring differences in air pressure in the ullage (the empty volume of the tank above the level of the liquid) and the air pressure produced by the weight of the liquid at the bottom of the tank. The pressures at the bottom of the tank are measured in a plurality of locations, and the differential pressures are combined to compensate for changes in the depth of the liquid when the tank is not level (e.g., when the tank is in an aircraft flying at an attitude other than straight and level). The electronics to measure the pressure and to process the pressure measurements are located remotely form the tanks, thus eliminating the possibility of ignition caused by the electronics when the liquid is fuel or other flammable liquid.

Abstract: If the diving mode is erroneously entered while travelling at a high altitude, such as when flying in an airplane, the error is detected so that calculating tissue in/out-gassing of inert gases continues. The control unit 50 of the dive computer records the water depth corresponding to the pressure measured by the depth measuring unit 61 together with the elapsed time, determines if the user is moving in a low pressure region based on water entry detection by a water entry detection unit and the depth detected by the depth measuring unit 61, and if the user is determined to be travelling in a low pressure region cancels measuring the water depth, cancels the wrongly selected operating mode, and changes from the operating mode used when diving to an operating used when not diving.

Abstract: A sensor involving a housing having a lower orifice to which a primary hose is connected. A secondary hose inside the primary hose is slightly shorter than the primary hose, with these hoses being placed inside a bin for determining fill level. One of two upper orifices in the housing is connected to a supply of air under pressure, with this air normally caused to flow outwardly from one of the hoses. Upon the degree of the fill of the bin being such that the material approaches the remote end of one of the hoses, the air normally flowing from the one hose is caused to be deflected into the remote end of the other of the hoses, causing a pressure increase. This pressure increase is directed through the other upper orifice, for being sensed at remotely located pressure sensing equipment.

Abstract: A temperature and pressure measuring circuit is provided. The circuit comprises an uncompensated pressure transducer, an analog-to-digital converter, a reference resistive device, and first and second switches. The transducer has variable resistive devices between first, second, third, and fourth bridge nodes. The analog-to-digital converter has first and second reference inputs and first and second differential inputs. When the first switch couples the first differential input and the third bridge node and the second switch couples the second differential input and a ground, a bridge voltage is measurable and a bridge resistance is ratiometrically determinable. The bridge resistance is employed to calculate a temperature. When the first switch couples the first differential input and the first bridge node and the second switch couples the second differential input and the second bridge node, a differential voltage is measurable. The differential voltage is employed to calculate a pressure.

Abstract: Dynamic monitoring of the amount of fuel remaining in an aircraft fuel tank is effected by delivering a constant volume flow of an inert gas into the fuel through the respective open distal ends of a sensor conduit tube and a reference conduit tube, each of which extends from a proximal end exterior of the tank to its respective distal open end located within the fuel tank. The sensor conduit tube distal end is fixed closely proximate the bottom of the tank, and the reference conduit tube distal end is fixed proximate but at a vertical spacing h from the sensor conduit tube distal end. The pressure at which the gas is delivered into the fuel at the constant volumetric rate through each of the sensor and reference conduit tubes is monitored. The pressure difference between the monitored pressure in the sensor conduit tube and the pressure in the free space in the fuel tank above the surface of the remaining fuel is directly proportional to the weight of the fuel lying above the sensor conduit tube distal end.