Abstract: A gauge assembly for use in measuring the level of a liquid in a storage tank is disclosed. The assembly includes a housing having an interior and having a lower opening communicating with that interior. A flanged spool is rotatably mounted within the housing and has wound thereabout a filament extending through the opening with its free end attached to a float element within the tank. A spring is connected to the spool and exerts a rotating force for winding the filament under the spool, and a removable strip of adhesive tape has opposite end portions adhering to the housing and a central portion adhering to the spool for locking for releasably securing the spool against rotation. A second strip of adhesive tape may also be used for detachably securing the filament to the housing.

Abstract: A fuel pump apparatus is made free from the influence of height fluctuations of the surface of fuel in a fuel tank by providing a fuel inlet window in the side wall of a float chamber for containing a fuel gauge, which is provided inside the side wall of a housing. The fuel inlet window provides communication between the float chamber and the fuel storage chamber in the fuel tank. Even when there are height fluctuations of the surface of fuel in the fuel tank due to vibrations or turning during running of the automobile, the height fluctuations of the fuel surface are damped in the float chamber because the fuel inlet window acts as a buffer to prevent direct influence of the height fluctuations of the fuel surface.

Abstract: A redundant level measuring system comprises a chamber for fluidic coupling to a process vessel whereby material level in the vessel equalizes with material level in the chamber. A float including a magnet in the chamber rises and falls with material level in the chamber. A magnet actuated visual indicator is mounted to the chamber for indicating level of the magnet in the chamber. A measurement instrument includes a probe and a measurement circuit. The instrument is mounted atop the chamber with the probe extending downwardly into the chamber. The measurement circuit measures a characteristic of the probe representing level of the material in the chamber. A shield in the chamber isolate the float from the probe.

Abstract: A water-monitoring apparatus includes a frame being installed by water. A reel is mounted on the frame. A tension cable is wound on the reel and including a lower end and an upper end. A buoy is connected with the tension cable. A control device is connected with the reel. When the water level changes, the control device rotates the reel so as to adjust a length of the tension cable extending from the reel for allowing the buoy to just float on the water surface. A detecting device is carried via the buoy for detecting at least one environmental characteristic and for producing at least one signal representative of the at least one environmental characteristic. A signal wire is electrically connected with the detecting device. The signal wire includes a helical section for automatically adjusting a distance between its two ends according to the position of the buoy. A monitor device is electrically connected with the signal wire.

Abstract: An apparatus and method for detecting water loss from a swimming pool includes a first container having an upper end, a lower end, an inner cavity and at least one opening allowing swimming pool water to flow in and out of said inner cavity; a substantially waterproof load cell positioned within the inner cavity of said first container, for measuring weight bearing thereon; and a second container having an upper end, a lower end, and an inner cavity closed to water flow, said second container positioned within the inner cavity of said first container having its lower end upon said load cell so as to bear weight thereon.

Abstract: This invention discloses a fluid level monitor including a buoyant element suspended from a filament wound on a spool, a load sensor that senses a tensile force in the filament and a rotation sensor that senses the rotation of the spool around which the filament is wound, wherein the buoyant element is adapted to be initially at least partially submerged at an equilibrium position at an initial level of a fluid, thereby creating a nominal tensile force in the filament, wherein a change in the level of the fluid changes the tensile force in the filament, a positive change in the tensile force corresponding to a downward movement of the buoyant element and a negative change in the tensile force corresponding to an upward movement of the buoyant element, wherein the rotation of the spool corresponds to an amount of distance traveled by the buoyant element.

Abstract: Apparatus for measuring in continuous manner, i.e.

Abstract: A method and system for remote monitoring of liquid level 21 within a container 12, such as the level of fuel within a propane cylinder. A magnetic float 20 disposed within the container 12 floats on the liquid 21, and lowers with the liquid level as fuel is consumed. Magnetic sensors 22 outside the container 12 sense the float 20 as it passes in the proximity of one of the sensors 22. A controller 26 receives output signals from the sensors 22 and transmits level indicating signals to a gauge 28 or other indicator for remote indication of the corresponding liquid level. The indicator 28 can be located proximal the user's direct line of sight, to remind the user to periodically monitor the fuel level to prevent running out of fuel.

Abstract: An apparatus for indicating a fluid level in a reservoir includes a conduit for communication with a reservoir and including a sight glass. A buoyant primary float is provided within the conduit, and a stop is provided within the conduit for engaging the primary float to prevent travel of the primary float beyond an upper portion of the conduit. A buoyant secondary float in the conduit is moveable together with the primary float when the primary float is not engaged by the stop, and is moveable separately from the primary float when the primary float is engaged by the stop and a fluid level in the conduit exceeds the level of the stop such that a portion of the secondary float may travel separately within the upper portion of the conduit. The secondary float preferable includes an elongate portion that passes through an aperture in the primary float, and a buoyant upper portion that is located above the primary float and is larger than the aperture in the primary float.

Abstract: A level control device is adapted for use in a wastewater pump station. The level control device cooperates with a discharge pump to control the volume of wastewater contained in the pump station. The level control device includes a buoyant housing for being located in the pump station, and capable of floating on a surface of the wastewater. A control switch is adapted for being operatively connected to the motor starter of the discharge pump to activate the pump when the housing reaches a predetermined elevation in the pump station due to an increasing level of wastewater. An anti-accumulation surface of the housing acts to resist accumulation of grease and other waste.

Abstract: An instrument and method for surveying the static fluid column of a cased oil well and measuring the volume of oil and brine in the fluid column is disclosed. The instrument uses the inherent differences in specific gravity between water, oil and brine to provide a more simple, convenient, portable and cost effective means for surveying oil columns in cased oil wells. The instrument includes a probe, and a modified fishing rig used to lower and raise the probe into the oil well. The fishing rig includes a handled rod, a reel with a numeric line counter, and length of fused braided fishing line. The numeric line counter visually indicates the length of line expelled from the reel's spool. The probe includes a tubular casing, which is filled with ordinary tap water. The probe is constructed and filled with water so that it has a specific gravity greater than oil and less than brine (approximately 1.0 g/cc).

Abstract: This invention discloses a fluid level monitor including a buoyant element suspended from a filament wound on a spool, a load sensor that senses a tensile force in the filament and a rotation sensor that senses the rotation of the spool around which the filament is wound, wherein the buoyant element is adapted to be initially at least partially submerged at an equilibrium position at an initial level of a fluid, thereby creating a nominal tensile force in the filament, wherein a change in the level of the fluid changes the tensile force in the filament, a positive change in the tensile force corresponding to a downward movement of the buoyant element and a negative change in the tensile force corresponding to an upward movement of the buoyant element, wherein the rotation of the spool corresponds to an amount of distance traveled by the buoyant element.

Abstract: A fluid level sensor for a fluid tank of a marine vessel is provided. The sensor includes a sensor mount and further includes a circuit housing that is pivotally connected to the mount to pivot about a predetermined pivot axis. A float assembly is configured to supply an actuating angle substantially impervious to fluid tank tilt and/or fluid splash at least along an axis generally perpendicular to the pivot axis. A circuit in the circuit housing is responsive to the actuating angle from the float assembly to provide an output signal indicative of the fluid level in the tank.

Abstract: A fuel gauging system for a motor vehicle fuel tank, including a housing (100) supporting a resistive element (200), an arm (300) pivotally mounted on the housing (100) and comprising at least one cursor (350) engaging the resistive element (200), and a lever (400) provided with a float connected to the arm (300) for monitoring the movements thereof. The system includes a housing (100) and an arm (300) which comprise complementary rotational guides (120, 310) and structure (316, 317, 318, and 319) to enable translation of the arm (300) on the housing (100). The arm (300) is combined with an L-shaped lever (400) so that one of the sections (420) defines the pivot axis of the device.

Abstract: A liquid level control system utilizes a sensor that is attached to a fixed support relative to a liquid container and transmits radio-frequency signals to a remotely located liquid supply system depending upon fluctuations in the liquid level. In the context of a swimming pool, the sensor housing is attached to a sidewall of the pool, at the desired water level. A sensor circuit located within the housing floats at the liquid level, and as changes occur, movement of the floating sensor results in the transmission of signals to either activate or deactivate a supply valve that supplies replacement water to the pool. A small opening located at an upper portion of the sensor housing cooperates with the floating sensor to dampen the motion of the sensor, providing a more accurate reading of the liquid level.

Abstract: A float-type liquid level gauge (20) is provided for measuring the level of a liquid within a storage tank (22). The gauge includes a gauge head (30) adapted for mounting to a portion of liquid storing container, a support arm (32) connected to the gauge head and depending therefrom into the tank, a float arm (34) including an elongate inner arm section (46), an elongate outer arm section (48) and a hinge section (50), and a float (36) connected to the outer end of the float arm. The inner section of the float arm is pivotally connected to the support arm for movement through an arc defining a first plane. The hinge section is connected at a first end to an outer end of the inner arm section and connected at an opposite end to the inner end of the outer arm section.

Abstract: A liquid level sensor intended to be placed in a tank or sump. The Sensor includes a displacer attached to one side of an elastic plate and an optical shutter blade attached to the other side. The shutter blade contains an aperture. When the displacer is not in contact with the liquid whose level is to be measured, the aperture is positioned on the optical axis of an optoelectronic slot switch, allowing radiant energy from the emitter in the switch to irradiate the sensor in the switch. When the displacer is immersed in the liquid, a moment force is created that deforms the plate, causing the aperture to move off of the switch optical axis and the shutter blade to block the radiant energy. The elastic plate constitutes part of one surface of a liquid-tight housing. The shutter and slot switch are located inside the housing.

Abstract: A float-type liquid level gauge (20) is provided for measuring the level of a liquid within a storage tank (22). The gauge includes a gauge head (30) adapted for mounting to a portion of liquid storing container, a support arm (32) connected to the gauge head and depending therefrom into the tank, a float arm (34) including an elongate inner arm section (46), an elongate outer arm section (48) and a hinge section (50), and a float (36) connected to the outer end of the float arm. The inner section of the float arm is pivotally connected to the support arm for movement through an arc defining a first plane. The hinge section is connected at a first end to an outer end of the inner arm section and connected at an opposite end to the inner end of the outer arm section.

Abstract: A device for signalling a predetermined height of fluid within a switching device is disclosed. The device includes a container having a first section, a second section, and a novel sealing assembly (operatively associated with the first and the second section) for sealing the fluid within the container. The device further includes a sphere, shaft and torque tube assembly (operatively associated with the first section) for measuring the fluid within the container, as well as valve member (operatively associated with the fluid level means) adapted for controlling a supply source. The device may be used as a high level switch or a low level switch, and is adaptable for pneumatic or electrical systems.

Abstract: Liquid level lever gauge with a hinged counterweight segment, or a hinged float arm segment or both a hinged float arm segment and a hinged counterweight segment. The invention permits lever arm gauges to be used in liquid storage tanks having small openings through which the gauge can be inserted.

Abstract: An autonomous apparatus for measuring the amount in volume, weight or level of a liquid in a tank. The invention provides an easy to read digital numerical display in what ever units the user has calibrated it for, indicating the amount of fluid in the tank. The self-contained electronic devise is normally mounted to a pipe nipple on the top of an above ground storage tank. An attached displacement device extends down through the pipe nipple into the liquid to sense the level of the liquid. This device relies on ambient light to power the solar cells and recharge a battery, which provides all the necessary power to operate the device both day and night. The apparatus is designed to be intrinsically safe and totally sealed. As such it operates electrically as a stand alone gauge and is intended as a general purpose indicator of tank contents for any tank location.

Abstract: A device for measuring and monitoring the volume of liquid in a container comprises an adapter for mounting the device in an opening in the top wall of the container. The adapter supports a beam onto which one end of a float is connected such that the free end of the float extends substantially vertically into the container. A strain gauge is disposed on the beam so that the measuring direction of the gauge is parallel to the main axis of the beam. The device can also include a sensor for measuring physical parameters of the container. A processor is connected to the strain gauge and any sensor to take data from those input devices. During a calibration operation, a measurement function is derived to correlate strain gauge readings to the volume of liquid in the container. The function is recorded in a processor which takes data from the strain gauge and calculates the actual volume of liquid in the container. An output component displays the measurement.

Abstract: A liquid level measuring system using a strain-gauge load cell is disclosed. The system includs a buoyancy weight standing upright in a liquid held in an object to be measured in a long bar shape, and having an average density substantially the same as that of the liquid; the strain-gauge load cell producing a change in the buoyancy weight varied with the liquid level as a change of an electrical signal; an amplifier amplifying a voltage signal detected from the strain-gauge load cell; an analog/digital converter converting an amplified voltage signal into a digital signal; a central processing unit applying a driving pulse to the strain-gauge load cell and average-operating a plurality of digital signals to find an average value of the liquid level; and a display displaying the average value of the liquid level as a number.

Abstract: A liquid level indicating system includes a plastic link chain suspended in a container extending between a high level position and a low level position of a liquid in the container. A weighing device is positioned above the high level position of the liquid for measuring the weight of the chain. An attachment device secures a lower portion of the chain to the bottom of the container with sufficient slack so as not to affect the operation of the weighing device.

Abstract: An object of the present invention is to provide a master cylinder which decreases the number of necessary parts, achieves easy assembly and stabilized quality, and surely prevents a float from coming off. In the present invention, the master cylinder tank 20 contains working fluid in the interior of a tank body 21 and incorporates a float 25 movable vertically in response to the increase and decrease in the working fluid by being guided by a float guide 22, and coming-off preventive portions 24, 24, capable of being deformed elastically, are provided to cover at least a part of the float 25 by extending a part of the float guide 22 upward beyond a guide rib 23. The coming-off preventive portions 24, 24 are formed by being bent to the inside into a shape such as to partially cover the float 25, so that the float 25 is prevented from coming off by the coming-off preventive portions 24, 24.

Abstract: A device for sensing the amount of oil in oil pans of internal combustion engines is disclosed. In the device, a bottom plunger is fixedly mounted onto the inside bottom of an oil pan, with a contact terminal being mounted onto the top surface of the bottom plunger. A top plunger is movably positioned above the bottom plunger, with a contact terminal being mounted onto the bottom surface of the top plunger. The two contact terminals are normally spaced apart from each other in the event of the amount of oil being not less than a preferred amount. However, the two terminals are selectively brought into contact with each other in the event of an oil shortage in the oil pan. The device also has a means for selectively generating an alarm signal under the control of an ECU in the event of the two terminals being brought into contact with each other.

Abstract: A method and apparatus for monitoring characteristics of a fluid contained in a vessel includes a fluid displacer suspended in the vessel. The buoyant force acting on the fluid displacer is measured using a pair of force transducers and used to calculate fluid characteristics such as the height of the fluid in the vessel, fluid density, solute concentration, and/or the presence of fluid cascading from one section of the vessel to another.

Abstract: A method and apparatus for monitoring characteristics of a fluid contained in a vessel includes a pair of triangular fluid displacers suspended in the vessel. The buoyant forces acting on the fluid displacers are measured using force transducers and used to calculate fluid characteristics such as the height of the fluid in the vessel, fluid density, solute concentration, and/or the presence of fluid cascading from one section of the vessel to another.

Abstract: A level sensor offset mounting mechanism that mounts in the tank fill pipe of an underground fuel tank and provides an offset for the lower level sensor portion from the drop tube. The level sensor offset mounting mechanism connects to an inner wall of the tank fill pipe by a connector. A conduit extends vertically downward from the connector to a position below the top of the tank. At the lower end of the conduit, a selectively rotatable offset device provides a horizontal offset away from the drop tube. The offset device may be rotated to an insertion position, wherein no offset is provided, to facilitate insertion, or extraction, of the level sensor into the tank. Connected to the offset device at an end distal the connection to the upper portion, the lower portion of the level sensor measures the fuel and water levels within the tank.

Abstract: Disclosed is a liquid level detection apparatus using the Archimedean principle suited for the measurement of the level of a liquid, in particular a high temperature molten metal. The liquid level detection apparatus is comprised of a probe (3) which inserted in a molten metal (2) and receives a buoyancy corresponding to the level of the liquid, an arm (4) which is supports the probe at one end, a support (7) which supports the arm, a force detector (8) which is provided under the other end of the arm and detects the buoyancy received by the probe through the arm, and a signal processing means (13) which performs operational processing on the electrical output signals of the force detector and finds the level corresponding to the output.

Abstract: A total precipitation gauge (10) incorporates a float gauge (16) extending downward to a liquid level (18) in a precipitation storage container. The float gauge (16) is formed with an elongate stillwell (20) extending into the liquid level (18), a float element (22) suspended in the stillwell (20) for rising and falling motion within the stillwell in response to the liquid level, and an elongate code bearing surface (24) coupled to the float (22). A code sensor (34) senses motion of the code bearing surface (34) for generating electrical signals (35) corresponding to motion of the float element and liquid level. The code bearing surface is a flexible coded strip (24) secured at one end to the float element (22) and at the other end to a spring loaded reel (25). The spring force of the spring loaded reel (25) is less than the weight of the float element (22) and ballast (26).

Abstract: Apparatus for measuring the specific gravity, weight, level, and/or volume of a liquid in a container includes two load cells supported at the upper end of the container, a first body of known cross-sectional area extending through the interior of the container supported in suspension by one load cell, and a second body of known volume extending through the interior of the container and supported in suspension by the other load cell.

Abstract: A liquid level gage system is disclosed. This system includes a displacer secured to a cable and movable in response to winding or unwinding said cable around or from around a rotatable drum. The rotatable drum is coupled to a driven shaft, and a drive assembly is provided to drive the driven shaft. An indicator subsystem is included which provides an indication of a change in the apparent weight of the displacer as the displacer is moved across a liquid level. A strain gage is a key component of the indicator subsystem. In one embodiment, an assembly is provided for powering the indicator subsystem and transferring data from the indicator subsystem which involves two pair of coils. In another embodiment, the gage system can be effectively remotely programmed using light signals.

Abstract: A system for monitoring a storage tank containing a fluid. The system measures the buoyancy force acting on a displacer suspended in a storage tank by means of a load cell. The resulting force acting on the displacer is proportional to the mass of fluid in the tank. A look-up table is first developed by making periodic entries of the resulting load cell output during the initial filling of the tank. This data is then stored in a computer memory. By utilizing this data and interpolating between entries, a very accurate measurement of the fluid mass in the tank is calculated. In addition, by making periodic measurements over time, small leaks can be detected. In the preferred embodiment, the monitor includes an A/D converter located adjacent to the sensor assembly, thereby substantially eliminating measurement errors due to thermoelectric effects.

Abstract: A wire guided float level measurement system includes a float, a nozzle and an ultrasonic level detector which are attachable to an open frame. The float, which is supportable on a froth, is slideably attached to te frame via one or more guide wires, and the nozzle and ultrasonic level detector are fixed near the top of the frame. In operation the frame, with attachments, is disposed in a flotation cell in an upright position so as to traverse a froth layer which is formed in the cell. The float, while supported by the froth so as to follow the froth level, serves as a target for pulses transmitted from the ultrasonic level detector, and the detector continually measures the distance to the float which is an indirect indication of froth level. Any mineral accumulation on the float, which would interfere with its buoyancy, is washed off the top of the float by spraying wash water through one or more nozzles.

Abstract: A fluid level maintenance sensor or use in a tank test system and which includes an upper sensor coil and a lower sensor coil mounted on a level sensing tube. A float carrying a ferromagnetic ring is operatively mounted in the level sensing tube which causes a fluid transfer signal to be generated when the float and ring are moved upwardly or downwardly to transfer fluid out or into the level sensing tube to maintain a selected fluid level in the tube.

Abstract: A tank gauge for oil tanks wherein a double pulley is provided on a common shaft with the shaft being journaled in the wall of a sealed housing which is in communication with the interior of the tank. One of the pulleys is within the sealed housing on the shaft while the other pulley is outside of the housing fixed to the same shaft. A float on a suspension cable extends downwardly from the pulley in the sealed housing while a weighted indicator on the other pulley extends downwardly along the outside wall surface of the tank. The pulley within the housing and the cable thereon is kept sealed from the atmosphere while the other pulley and the indicator cable are in the open atmosphere on the exterior of the tank.

Abstract: A liquid tank leakage detection system includes a standpipe and associated measuring pipe together with a sealing connection to the filler pipe of a liquid tank system. A liquid level detector used in cooperation with the measuring pipe includes a float coupled to a measuring beam having one end fixed and the other end coupled to the float. Level changes within the liquid system produce position changes of the float which in turn causes bending or flexing of the beam. A bridge detecting circuit including strain gauges coupled to the flexing beam is operative to provide an output signal indicative of the extent of liquid level changes. A thermocouple is positioned within the liquid tank to provide a temperature compensating signal for use by the measurement system.

Abstract: A tank leak detection system in which a liquid level multiplier is connected to a differential pressure transmitter one side of which may be piped back into the tank to compensate for internal changes in tank pressure. A capillary having a small bore connects the transmitter and the multiplier to reduce temperature effects. Changes in tank temperature may be sensed, i.e., by a long bulb thermometer and either fed to a temperature transmitter to convert temperature change into a single to a computer used to calculate true tank level and output a signal proportional thereto or fed to the level transmitter to compensate for temperature changes.

Abstract: Apparatus for detection leakage of hydrocarbon-containing liquid, such as gasoline, from a generally cylindrical tank. The apparatus includes an elongate displacer having a vertical axis and extending substantially the full height of the liquid in the tank. The displacer has an upper end and a lower end with the displacer lower end terminating closely adjacent but spaced from the bottom of the tank. The displacer is made of a material having a coefficient of linear expansion of less than 20.times.10.sup.-6 inches per inch per degree centigrade. Furthermore, the displacer is substantially symmetrical about about any plane through its vertical axis and it has an outer surface which is a surface of revolution. The displacer has a varying diameter along its length corresponding to the horizontal surface area of the tank at the same height inside of the tank. The apparatus further includes a sensor for providing an indication of the weight of the displacer disposed in the liquid.

Abstract: Disclosed is a fluid level sensor including a float mounted for movement in a mounting tube by a pair of spiral springs which are relatively rigid in a radial direction but relatively flexible in a longitudinal direction. At the top of the float a magnet is located and at the top of the mounting tube, a Hall effect device is located. As fluid enters the mounting tube through apertures in the lower portion, the float is gradually buoyed and moves closer to the Hall effect device changing its electrical output. Because the springs position the float inside the mounting tube, striction and hysteresis in conventional float supports is eliminated as well as wear between the float and the outer tube. Measurement range may be changed by changing float length and outer tube length as well as the spring constants themselves.

Abstract: A water level and temperature detector alarm device and more particularly to an alarm device which includes a buoy type detector to alternately detect water level or water temperature so as to provide an audio alarm signal through a buzzer when water level or water temperature reaches the predetermined range. The detector is connected to the expansible end of a conduit and includes a sleeve having set therein two reed switches and a thermswitch and having mounted thereon a body which includes therein a circular magnet. An alarm device is connected to the other end of the conduit which is having a movable positioning rack mounted thereon for positioning of the whole assembly. Following the rising of water level, the magnet of the buoy alternatively drives the reed switched to turn on the alarm device to buzz or, when water temperature reaches the predetermined range, the thermoswitch will be turned on to drive the alarm device to buzz.

Abstract: A vibrating strip transducer, wherein a vibrating strip 54 mounted between a fixed mount 52 and a moveable mount 51 and under load 53 directly responds to a change in force applied to the strip with a change in the magnitude of stress in the strip. The change in stress produces a corresponding change in the resonant frequency of vibrating strip 54 which is detected by coil assembly 55 to output a frequency based signal directly related to the force applied. Fluid level and buoyancy sensing embodiments are also disclosed.

Abstract: The liquid level in a tank is determined by measuring the current supplied to an elctromagnet from which a rod having a specific gravity greater than that of the liquid is suspended in the liquid.

Abstract: A liquid level indicator comprises an elongate member extending vertically through a liquid container, the weight of the member being sensed as a measure of the liquid level in the container. At least at one predetermined point of its length, the member is formed with a transverse portion having a lower surface extending substantially horizontally. Furthermore, the member is tubular, and the transverse portion is located within the tube but does not occupy the entire internal cross-sectional area thereof. To determine the absolute position of the liquid level, the indicator utilizes an instantaneous change of weight provided by the liquid.

Abstract: The apparatus comprises a vertical elongate plunger (2) which is freely suspended by its top end from a thread (3) so as to be partially immersed in the liquid. A housing (1') mounted at the top of the recipient houses a pulley (4) capable of rotating through not more than one-fourth of a turn, said pulley serving to wind the plunger suspension thread and being fixed to a counterweight (5) so that the angular position of the pulley and counterweight assembly varies as a function of the depth of plunger immersion, and consequently as a function of the depth of liquid in the recipient. A mechanism is provided for measuring and digitizing the angular position of the pulley and includes, in particular, a code disk (11) outside the housing (1') and a magnetic coupling for transmitting motion from the pulley (4) to the code disk (11) through said housing.

Abstract: An apparatus for checking the workability of a float assembly used to determine the level of liquid in a vessel is disclosed and comprises: a float extension associated with the float of the float assembly and movable when the float assembly is in working order in response to the movement of the float caused by changing the level of liquid in the vessel; a sensor located in spaced relation to the float extension and acting to provide a signal when the float extension is in a predetermined position; and a checking system capable of being activated to move the foat extension into the predetermined position without regard to the level of liquid in the vessel when the float assembly is workable.

Abstract: A portable liquid level device is provided for measuring the depth of liquid in a storage tank. The device has a portability similar to that of a regular dip stick, but provides more accurate measurement of liquid level especially with liquids which do not show up clearly on a dip stick. The device has a tube which is open at its lower end and a guideway within the tube along which a float can move. Rollers are mounted near the upper and lower ends of the tube and carry a loop of flexible tape connected to the float. The tape has indicia on its external surface which can be read on a sight glass mounted at the upper end of the tube. All of the moving parts are protected within the tube.

Abstract: A device for measuring leaks by measuring buoyancy force changes on a mechanical force transducer inserted into a liquid in the storage tank. The buoyancy force changes result in liquid level changes inside the tank which in turn cause moment forces acting on the mechanical force transducer. These moment forces cause strain changes in the mechanical force transducer. These strain changes are measured by a strain gage attached to the mechanical force transducer.

Abstract: A method, and an apparatus for performing the method, are described, for imaging a region of a body using NMR in which part of the region is moving with a motion such that its displacement with respect to time is a nonmonotonic function during the time period over which NMR data signals are collected. The data signals are collected in an order dependent on the motion such that motion artifacts are reduced.