Abstract: A flow sensor assembly particularly suited for measuring localized flow components within a region of flow which may exhibit flow components of varying velocity vector in both intensities and directions. The assembly includes a sampling conduit which confronts the localized flow and, through an entrance partitioning arrangement, develops a sampling flow therethrough representing the product of the cosine of the angle of incidence of the intercepted flow with the axis of the sensing channel. A flow sensor is positioned within the sampling flow to provide a readout of the velocity thereof. The apparatus can be mounted on a movable probe and employed to determine the intensity and direct of localized fluid flow components within larger regions of flow.

Abstract: A water meter with integrally constructed fire hydrant to be used for residential applications. The device comprises an input, an output, and a hydrant. The output directs water into the home water supply. Water travels throught the input and through a water meter. The path of the water then experiences a divergent path. One path passes through a valve and out of the hydrant. The other path passes into the home water supply. The device can be installed as easily as a water meter presently is installed. In an alternate embodiment, the hydrant is placed prior to the meter in relation to the flow of water.

Abstract: A flow measuring device for checking on medical infusion devices comprises a vertical tube 5 having at least three level sensers 10 and 11 for sensing when a liquid reaches the level of each senser. A logic unit 12 containing a timing device triggered by the first senser measures the time taken for the liquid to reach the second senser and the logic unit compares this time with a predetermined time and if the time is less than the predetermined time sets the device to compare a time taken to reach the third senser but if the time is more than the predetermimed time calculates the flow rate. A multiway valve 1 at the inlet of the device under the control of the logic unit permits flow from the infusion device under test to the tube, from the device under test to a drain 15 or to that drain and the tube, or from the tube to the drain or blocks all flows.

Abstract: A flow meter insertable into a riser tube or an intake tube of an aquarium filter includes an insert placed in the tube and along which water flows as it is drawn by means of a power head, impeller or pump. A flow restriction arrangement, defines a flow path with respect to the insert. The insert carries an elongated slot with a scale and has two oppositely directed semi-circular flanges dimensioned so that they block water from flowing through the entire area of the container but allow the water to enter on one side of the insert, then flow into the slot and exit along the opposite side of the insert. A metering float inserted adjacent the scale and is positioned at a level height relative to the flow rate of water passing the insert. This value can be read on the scale.

Abstract: An apparatus for use in measuring fluid flow across a boundary is disclosed including a conduit, supply means for control fluid and two fluid flow sensors. The conduit is positioned to extend across the boundary so that its open ends are located on opposite sides of the boundary. The supply means introduces control fluid at an intermediate point so that control fluid flows through the conduit in opposite directions and discharges through both open ends. The fluid flow sensors are mounted so that each may sense variations in control fluid flow exiting at the ends of the conduit. These sensors generate output signals responsive to fluid flow across the boundary.

Abstract: Apparatus and accompanying methods for a custody transfer metering system, that illustratively utilizes a dual tube Coriolis mass flow rate meter and provides accurate totalized mass flow measurements and fault detection capability, are described. Specifically, this apparatus senses time differences occurring in the movement of both flow tubes. Four such time difference measurements are taken and combined in a pre-defined manner so as to eliminate differences appearing in the electrical characteristics of analog circuitry connected to each of two sensors used to detect tube movement and thereby to advantageously increase measurement accuracy. Mass flow rate of the fluid passing through the meter is determined, as a function of the combined time measurements, in terms of normalized mass and time units and thereafter converted into user specified mass units/unit time. The resulting converted value is used to compute totalized mass flow and to set and/or update various system outputs.

Abstract: The flow rate of a fluid, such as a herbicide, from delivery equipment is established by causing the fluid to flow into a calibration vessel (14), and measuring the volume which flows in a predetermined time. The vessel (14) is connected to a delivery head (8) of the equipment by an intermediate component (16). A tube (54) provides a passage for venting air from the vessel (14) as fluid flows into it. After a calibration measurement, the fluid can be returned to the equipment by inverting the equipment. The outgoing fluid is then replaced by air flowing back through the tube (54).

Abstract: An apparatus for measuring a flow rate of a fluid such as a gas, having a by-pass passage, a measurement passage, a cantilever-shaped pressure-receiving plate in the measurement passage and a deflection detector for measuring an amount of deflection of the pressure-receiving plate.

Abstract: A portable self-contained milk flow indicator is provided for dairy barn applications. The milk flow indicator consists of a milk sensing device, a timing and switching circuit, indicators of the condition of milk flow, and a rechargeable battery, all sealed in a self-contained portable unit which can be used at any point in the milk line of a conventional dairy barn milking operation. The indicator is also provided with a battery charger which can be mounted on the wash manifold of a dairy barn milk house so that when the indicator is placed on the wash manifold for cleaning the battery, housed in the indicator, will automatically be recharged.

Abstract: A water flow measuring and dispersing device for measuring flow characteristics of a water stream from fire fighting equipment such as a hydrant or pump truck in which the device includes a funnel-shaped housing, a flow measuring meter and a dispersion element. The flow measuring meter is positioned in a neck portion of the housing which is of uniform diameter, and the housing tapers outwardly to a discharge portion having a diameter greater than the neck portion. The dispersion element consists of a crossbar and disc positioned normal to the water flow path in the discharge portion. Dispersion of the stream is enhanced by the infusion of air into the stream caused by the flow of water around the disc.

Abstract: A wading rod for use in measuring depth and current flow velocity in streams, rivers, and the like is disclosed which comprises a base, a lightweight, non-metallic main rod extending from the base having gradations for measuring depth, a lightweight, non-metallic adjustable sliding rod having a locking means, a tailfin receiving means, a receiving means for a current meter, signal transmission means capable of transmitting a signal proportional to flow velocity from a current meter to a signal receiving means, said signal transmission means being disposed inside of said sliding rod, and a level indicator. The wading rod of the present invention is lighter, reads depth more accurately, is more convenient to use, and is more durable, accurate and versatile than prior art wading rods. This rod also operates in rivers of high specific electrical conductance, an improvement over prior art rods which tended to shunt out the meter signal when collecting velocity data in such rivers.

Abstract: A unique combination of two transducers. A hot film shear stress gauge and a piezoelectric pressure transducer are coaxially located along the longitudinal centerline of a cylindrical metal shell. The hot film shear stress gauge is exposed to the fluid while the pressure transducer is positioned directly below. Conductors are attached to each and the remaining volume filled with plastic to form a colinear unit. The conductors attached to the hot film element provide power while the conductors attached to the piezoelectric transducer transmit pressure produced electrical signals therefrom. The resulting configuration allows the measurement of fluctuating shear stress and fluctuating pressure to be made simultaneously at a single spatial location at a solid wall bounding a turbulent fluid flow layer.

Abstract: An upstream flow conditioner (rectifier) for a vortex flowmeter. The flow conditioner is constructed with flow rectification vanes placed parallel to the axis of the vortex shedding body at the inlet section of the meter body or between flanges for short meter bodies and insertion meters. The vanes comprise three equally spaced apart flat strips which are inserted in slotted grooves on the inlet side of the meter body or on a plate that can be inserted between flanges. The thickness and the depth of the strips and their distance from the shedding body are optimized to ensure the reproduction of a desired turbulence level and mean fluid velocity profile in the plane perpendicular to the shedding body.

Abstract: Fail-safe bypass monitoring system for measuring volumetric flow rates in a pipe which normally carries a relatively low pressure, low volume gas flow. The system comprises a water trap valve positioned to seal off relatively low pressure gas flow through the pipe and divert the gas flow through a flowmeter. The flowmeter receives gas flow from the pipe adjacent a first end of the water trap valve and returns gas flow to the pipe adjacent a second end of the water trap valve. The water trap valve always passes relatively high pressure gas directly through the pipe.

Abstract: A Coriolis-type mass flowmeter in which the flow tube is vibrated at a resonance frequency approximately equal to the frequency for forced or natural vibration in a higher anti-symmetric mode, such as the second mode. In the preferred embodiment the flowmeter is symmetrical and has sections of oval cross section that provide low bending resistance to the vibration at the points where the amplitude of vibration is the largest. The preferred embodiment uses electronic signal detection/processing means that generates two signals proportional to flow tube velocity in the direction of vibration at equal distance but on opposite sides of the plane of symmetry of the tube, generates a sum and a difference of the two signals, integrates the sum, demodulates the integrated signal and the difference of the two signals to produce peak amplitude signals, and divides the peak amplitude signals to produce an output that is proportional to mass flow rate.

Abstract: A harness is provided for supporting a water meter on a fire hydrant so as to minimize the possibility of the water meter being accidentally dislodged from the first hydrant. The harness comprises a first loop which fits around the conical top of the fire hydrant and a second loop which fits around a portion of the water meter. A rod extends between the two loops and tensioning means is provided to draw the two loops toward one another via advancing the rod so as to both pull the water meter back toward the fire hydrant and to suspend that end of the water meter to which a water hose is attached from the conical top of the fire hydrant.

Abstract: Consistency in shot peening is obtained by a system using a force sensor to sense the reaction force from a shot peening gun. The reaction force is used to calculate the average velocity of the shot stream. Since the quality of effect of the shot peening process depends upon the square of the velocity of the shot and the mass of the shot, control of the shot velocity and mass flow rate is used to provide consistent shot peening results. Additionally, the force sensor is used to trigger an alarm and/or turn off the shot peening if the reaction force is too low such that a clogged nozzle or other malfunction is occurring.

Abstract: A solid state temperature and/or anemometer measuring instrument for a fluid medium such as atmosphere the instrument including a pair of semi conductor junction means such as a zener diode one of which is exposed to fluid flow the other being isolated therefrom and providing outputs which are a function of the temperature of the fluid and a measuring device for measuring the respective outputs the differential being an indication of temperature or fluid speed. Such a device has specific application in an optical air pollution monitor to give a continuous indication of fluid flow thus ensuring that the monitor is sampling fresh batches of fluid from a monitored space.

Abstract: A fluid metering device (10) is provided for automatically restricting (i.e., shutting off or reducing) fluid flow to a filter (16). The metering device (10) has a vane (32) which turns as fluid flows and thereby drives a gear (92). Once the vane (32) has rotated a selected number of times, as a result of the fluid flow, the rotation of the gear will break a frangible link (82), causing the fluid flow to stop or reduce by closing a valve (60). The customer will know to replace the filter (16) when the fluid no longer flows or is substantially reduced, and the customer will also have to replace the frangible link (82) to enable the fluid to flow at full volume again.

Abstract: Test and man-rating of an oxygen generation system required analytical methods for evaluating system performance both in the laboratory and on the aircraft. The Oxygen System Analyzer is capable of monitoring four performance variables which include: (1) system gas flow rate, (2) product oxygen concentration, (3) system outlet pressure, and (4) aircraft cabin pressure. The analyzer is a portable tester designed to be used on a frequent basis to ascertain system performance and assure reliability and safety. The device may be used either in preflight system checkout mode or to assess in-flight performance characteristics and compliance with design specifications. The analyzer is packaged in a flight worthy case (20.times.13.times.8.5 inches, 31 pounds) and operates from a 12 volt rechargeable power system for 8-10 hours. Data is handlogged from digital panel meters.

Abstract: The present invention is directed to an apparatus and method for monitoring the continued rotation of a non-magnetically attractive indicator, e.g., a rotating, plastic dial, disc, wheel, arm or the like of a meter. The present invention is particularly useful for detecting the satisfactory operation of flow meters, e.g., meters used to determine the flow of fluids from oil and gas wells, in transmission lines and in chemical processing plants. The present invention provides a system for monitoring the operation or rotation by employing a rotating, magnetically attractive actuator to actuate a magnetic switch which in turn actuates an electrical switch for producing a monitoring signal. The apparatus and method of the present invention provide a rigid, dependable, accurate and wear-free device for monitoring the continued operation of a flow or other meter.

Abstract: A flow measuring device comprises a flow tube having sequentially disposed inlet, converging and throat sections and first and second pressure sensing assemblies for sensing the pressures in the inlet and throat sections, respectively. Each of the pressure sensing assemblies includes a tubular housing portion which extends outwardly from the flow tube and communicates with the interior of the adjacent section thereof, a cylindrical diaphragm-type pressure sensing element which is slidably received in the housing portion, and a gate valve having a gate which is receivable in the housing portion thereof when the sensing element therein is in an outwardly disposed position in the housing portion. Each of the housing portions has a manometer tap formed therein which is disposed outwardly at the gate valve therein.

Abstract: A flowmeter has a vertical flow tube with a float member therein and an electrically illuminatable display to provide a vertically graduated scale. The numeric scale indicia are preferably provided by a multiplicity of cell clusters, each comprised of one or more electrically illuminatable cells and the cell clusters are illuminated to show selected numerical scales that are chosen as a function of the specific gravity of a fluid and the pressure of the fluid being measured. The flowmeter includes a memory device containing stored information as to numeric values corresponding to various specific gravities and pressures to generate the appropriate scales and electrical signals corresponding thereto to illuminate the display.

Abstract: A method and apparatus for measuring flow parameters of an unknown fluid uses four pressure sensors at fixed, spaced locations within a cylindrical member having a constricted and a full diameter portion. The constricted portion has a smooth surface of transition at its entry, internal corrugations, and a sharp increase to the full diameter at its exit. There are no moving parts. All flow parameters can be calculated from the four pressure measurements taken at the entry and exit of the constricted portion and two aligned but separated locations spaced from the sharp increase to full diameter.

Abstract: A system for detecting the distribution of flow velocity is used in combination with an air jet loom of the type wherein auxiliary nozzles eject air into an air guide channel formed on the front side of a reed. The system consists of a carrier engageable with a rail disposed parallel with the reed and movable along the rail. The carrier carries a flow velocity detector whose flow velocity sensing section is located in the air guide channel, thereby effectively detecting the distribution of flow velocity of air stream throughout whole the air guide channel.

Abstract: This invention relates to a manually-operated mechanism for inserting and removing flow measurement probes and the like from a pipeline carrying a flowing fluid, such mechanism being characterized by a hanger subassembly including a yoke mounted atop the probe for movement therewith externally of the pipe along with a pair of threaded rods suspended non-rotatably from the yoke and which parallel one another as well as the longitudinal axis of the probe but on opposite sides thereof, a drive subassembly supported in fixed position beneath the yoke and including a common drive shaft along with a pair of worm gear trains each containing a worm gear threaded onto one of the threaded rods, such drive subassembly operatively interconnecting the shaft and the two threaded rods for simultaneously and synchronously raising or lowering the latter, and a handcrank for turning the drive shaft.

Abstract: A device for measuring and displaying one or a plurality of characteristic parameters of water flowing through the spout of a sanitary valve is formed as an integral self-contained unit. The unit comprises a housing formed with an axial passage. One or a plurality of sensors responsive to the parameters of interest communicate with this passage. The value of the parameter of interest, particular the temperature of the water, is displayed by a display unit also integrated into the housing of the device. A connecting stud of the housing can be screwed into the outlet opening of a standard sanitary valve.

Abstract: An equal flow, metering and manifold system which is used to control the flow of natural gas from a single source to a single utilization device via separate metering systems for a plurality of users which can independently and separately control the operation of the single utilization device.

Abstract: A sensor for monitoring the interior of a sodium-cooled fast breeder reactor comprises a pair of symmetrical magnetic cores, a magnetostrictive or piezoelectric vibrator element bonded to one of the cores, a primary coil and a plurality of secondary coils surrounding the magnetic cores, and a container enclosing the above members. The primary coil applied with an exciting alternating current generates an acoustic signal voltage indicative of sound, if any, originated in the interior of the reactor. The magnetic flux produced by the exciting current is influenced by the temperature and flow velocity of sodium flowing around the sensor, and corresponding voltage signals resulting from the changed magnetic flux are induced in the secondary coils.

Abstract: A flow meter includes a transparent tubular housing in which an indicator in the form of a piston having a radially expanded edge cooperates with a tapered inner peripheral wall portion of the housing. The housing can include scale indicia of flow rates coinciding with positions of the indicator edge. In addition, a temperature sensitive label providing a visible indication of fluid temperature can be orthogonally aligned with respect to the flow rate scale to permit accurate placement of a graphic overlay exhibiting representations of a different fluid characteristic which varies with changes in the flow rate and temperature of the fluid within the ranges indicated by the meter. Projection of the temperature indication to the indicator edge identifies a particular value for the fluid characteristic shown on the graphic representation by mere observation.

Abstract: A length of duct is provided for seating a portable airflow meter so that when the end of the duct away from the airflow meter is put over a part of a ventilation opening, airflow can be measured in a manner not subject to substantial errors from the presence of jets or eddies in the flow of air out of the ventilation opening. The lower part of the shroud has a flat, perforated baffle plate disposed horizontally near the bottom in the center of the duct and at a distance farther towards the middle of the duct, and evenly spaced set of downwardly pointing triangles extending obliquely from the respective middles of the duct wall and a more numerous set of upwardly extending oblique members having the shape of short angle bars, tapering slightly. Facing the front and back of the airflow meter are cutouts in the upper end of the shroud so that measurements of air flowing into the ventilation opening will be equivalent of those that would be made without the shroud.

Abstract: The amount of air entering an engine is determined by selecting the more accurate of two airflow determination means. One means measures a parameter characterizing airflow into the engine. Another means calculates airflow into the engine as a function of engine speed and air density.

Abstract: An airflow measuring sound attenuator that profiles and stabilizes the pattern of air flowing out of attenuation throats and accurately measures the average velocity of air flowing through the attenautor by a pitot tube array mounted in the region of profiled and stabilized airflow.

Abstract: A volumetric flow gauge is provided for use particularly with ambulatory oxygen users who receive oxygen on a continuous or semi-continuous basis from an oxygen tank communicating to the patient through a line terminating in a two-tip nasal cannula, the two tips of which projects into the nostrils. The gauge comprises an upright indicator portion, having a hollow tube with a floating ball inside elevationally responsive to the upwardly directed volumetric flow of gas inside, and an integral plug spaced from the gas fitting from the indicator which plugs the second cannula tip, while the first tip receives and gauges the flow of oxygen therethrough.

Abstract: A converter has a pressure to voltage transducer connected to an amplifier. A laminar gas flow element (L.F.E.) may be connected to the transducer and the converter output voltage is a measure of the gas flow rate through the L.F.E. The converter gain may be switched from one value when one kind of anesthetic gas is being monitored to another gain values when a second gas is used. The ratio of the one gain values to the second is made equal to the ratio of viscosities of the second gas to that of the first so that recalibration is not necessary when the kind of gas in use is changed. Further, the absolute values of the stepped gains with fixed ratio are adjusted vernierly to produce a predetermined output voltage for each L.F.E. with a known rate of gas flowing, which absolute gain value in each case may be recorded as a characterization of each particular L.F.E. After such characterizations are made, no further calibrations of L.F.E. or converters are needed and any L.F.E.

Abstract: A multiple change-over valve which can be set into various positions suite for the operation of a water treatment plant. A moulded synthetic resin body defines two valve units with seats for two movable assemblies controlled by cylinder-piston systems such as to assume two positions; each of the two movable assemblies comprises at one end a cavity with lateral apertures, and in an intermediate position longitudinal passages for cooperating with various passages, including transverse passages, between the two seats, and with passages for communication with the top and bottom of a resin column. A suction feeder for the regenerating solution, in the form of a venturi tube, is fixed between the water feed and the top of the column in order to operate when the column is connected to discharge.

Abstract: The nozzle velocity profile of a textile treating assembly, such as a tenter oven, is determined in a simple and effective manner. A pitot tube is mounted on a fabric web-engaging support. A pressure transducer is operatively connected to the pitot tube and produces an electrical signal proportional to the difference between the static and total pressures sensed by the pitot tube for each nozzle. A wire is releasably connected to the transducer and extends to the exterior of the tenter oven, and is connected to a reeling assembly at the exterior of the tenter oven. The position of the sensing portion of the pitot tube is adjustable so that it can extend above or below the fabric web.

Abstract: In the gas meter comprising a housing made of non-magnetic material and provided with gas inlet and outlet, a driver section provided with a rotating member rotated in accordance to the flow amount of gas, and a meter driven by the driver section to display the flow amount of gas, a detector device for detecting whether or not gas is being used in a room or inside a house characterized by a magnetic material attached to the rotating member, by a sensor or sensors attached to the outer face of the housing to detect the rotation of the rotating member, and by a display driven by the output of the sensor to display whether or not gas is being used.

Abstract: A condition responsive sensor is provided with a flow sensor channel means that is interconnected to a capillary tube restriction. The capillary tube restriction can be readily interchanged on the device to change the response of the condition responsive sensor. A very small flow sensor is placed in the flow sensor channel. The flow sensor channel and the capillary tube restriction can be placed generally parallel to one another to reduce the overall length of the device.

Abstract: An apparatus for measuring the flow-rate of ferromagnetic granular media in a gravity-fed and/or low velocity peening apparatus by passing the media in the supply line at substantially constant head pressure through an inductive transducer, wherein the current drawn by the induction coil varies in accordance with changes in the flow-rate.

Abstract: A pressure level sensor for mounting a pressure transducer in a fluid flow channel. The sensor is characterized by an elongated wedge-shaped configuration wherein the width of the convex front wall portion is less than that of the rear wall portion which in turn is less than the length of the sensor. The side wall portions of the sensor each have concave surfaces, the radius of curvature of which is a function of the length of the sensor. At least one side wall portion contains a horizontal pressure port for communication with the pressure transducer. The front, rear, and side wall portions are tapered and curved vertically inwardly and terminate at a top wall portion. When the sensor is arranged on the bottom of the channel with the front wall portion facing upstream relative to the fluid flow, the velocity vector of the fluid flow is perpendicular to the direction of extension of the opening, thereby to minimize flow velocity effects on the pressure transducer.

Abstract: A device for continuous, gravimetric metering and pneumatic conveying of pourable material provides that a material stream is conveyed over a measuring path while charging a load measuring device and the product of moment load and conveying speed is formed. The conveyor is in the form of a rotor having an essentially vertical axis and conveyor pockets in the form of chambers or cells which are moved with the rotor in a circular orbit over the measuring path. A housing surrounds the rotor in a pressure tight manner and includes a charging aperture and an emptying aperture which are rotationally displaced from one another. A load measuring device is connected to the housing and a tachometer is provided for measuring the angular velocity of the rotor. A pneumatic conveying system is provided which has feed lines respectively communicating with an air feed aperture in the housing and the emptying aperture.

Abstract: A system which enables the measuring, testing and accounting for a fluid, preferably oil, as stored in a tank battery adjacent a producing oil well system. In its most basic form, the system includes a master control unit associated with a level transducer for each tank, basic sediment and water monitors for various conduits within the system, temperature sensors for each tank and the various conduits, and a data collection box for transferring data stored in the master control unit after a predetermined amount of time has transpired. Several options are available with this system and these include telemetry options for remote reporting of the various parameters of the system and various alarm and theft prevention devices.

Abstract: A procedure and means for lubricating the bearings in equipment comprising a plurality of oil-lubricated bearings (7). The oil is conducted to each bearing separately through a volumetric meter (4) which meters the oil quantity going to the bearing. The oil is conducted to a unit (14) comprising a plurality of volumetric meters (4), where it is distributed through a branching tube (2-3) comprised in the unit to each meter. A signal proportional to the flow passing through each meter can be conducted electrically further to a monitoring point.

Abstract: A device for measuring the flow rate of a fluid in the annular space of a steam generator; having within a probe housing, kept fixed relative to the outer wall of the steam generator, a probe. A seal between the probe and the probe housing is formed by an elastic bellows fitted in such a way that it constantly applies one end of the probe against the inner wall of the generator.

Abstract: In a flow rate control apparatus, pressure of a primary, or controlled, liquid is reduced without application of shear forces thereto. Each of first and second piston and cylinder assemblies has a first port on one side of the piston and a second port on the other side. A secondary fluid path between the two second ports contains a controlling fluid directed through a pressure reducing valve. The rate of flow of the primary fluid from the discharge cylinder is controlled by the rate of flow of the secondary fluid through the pressure reducing valve. A four way valve couples the controlled liquid at relatively high pressure through the first port in a first cylinder, and the controlled liquid is discharged at relatively low pressure from the first port in the second cylinder. The first and second pistons are rigidly connected to assure synchronized motion and accurate metering of the controlled liquid and to provide for driving of both pistons in response to input pressure of the controlled liquid.

Abstract: Flow control of a shear-sensitive, i.e. pressure gradient degradable, liquid from a high pressure source to a lower pressure discharge is achieved by controlling the liquid's exposure to a degradation pressure gradient. Two displacement chambers are provided and connected by a control conduit. First and second movable barriers in the first and second chambers respectively contain a separate controlling liquid. A pressure and flow control valve is included in the control conduit. Incoming pressurized controlled shear-sensitive liquid flows into the first displacement chamber to displace the first barrier which displaces controlling liquid through the flow control valve. Shear-sensitive liquid is dispensed at relatively lower pressure from the second chamber in response to movement of the second barrier driven by the controlling fluid coming from the control conduit into the second chamber.

Abstract: The invention provides ultrasonic apparatus 64 for measuring the amplitude of oscillation of a fluid. The apparatus 64 combines an ultrasonic flowmeter 60, 62, 65 which gives an indication of velocity of the fluid, with an integrating circuit 74. The integration is carried out over successive half-cycles of the oscillation, and may be arranged to give an average value of the amplitude.

Abstract: A flow meter for detecting and recording a plurality of data points representative of the depth and velocity of liquid flow in an open container. A weighted sensor has a dimpled surface to induce turbulence at low velocities to assure a substantially linear velocity characteristic. An electromagnetic velocity transducer and a single tube bubbler are engaged to the sensor to provide data which is periodically read into a cassette recorder. A microcomputer controls timing functions with respect to the collection and recordation of data within the system.

Abstract: A device for measuring fuel flow to a power plant such as a turbo fan engine with a very high degree of accuracy, for example, .+-.0.5%. A tubular flow loop having quick disconnect fittings for detachably connecting the loop between the aircraft fuel system outlet and the engine fuel inlet is disclosed. Two specially calibrated mass flow transmitters are arranged in series, each preceded by a straight section of piping having a preferred given length to diameter ratio. Preceding each of the two straight pipe sections is a honeycomb flow straightener and three in-series perforated plates for removing any effects of upstream flow characteristics from the transmitters.