Abstract: A feeding monitor system provides data responsive to a human or animal subject sucking on a nipple or other outlet connected to a supply of feeding fluid stored in a reservoir. A hollow chamber provided in between the reservoir and the outlet includes a pressure sensor and/or a fluid flow meter to provide electronic monitoring signals. These signals can be amplified or otherwise conditioned for display, transmission or storage, e.g. in digital form. The invention has wide application, including without limitation use in a neo-natal intensive care environment for diagnosis and screening of disease and disability, assessment of different feeding systems including nipple characteristics, gauging strength and oropharyngeal function, and evaluating response to therapy for feeding difficulties of infants.

Abstract: A flexible tooling fixture that has a pallet bed lying within an x-y plane and reference elements for alignment of the bed to the manufacturing tool; and at least two sets of supports extending from the top of the pallet bed, each set consisting of: (i) a flexible pivot to accurately locate differing brackets of the sensor assemblies to maintain the axis of the barrel in a common z-x plane, the z-x plane being off-set from the center of the bed, and (ii) one or more fixed stops for engaging the barrel and bracket of each assembly to determine a common-x-y position for each sensor module with the axis of the barrel in a predetermined relation to the bed, one set of supports being located to determine alignment of the axes of one class of sensor assemblies within the predetermined position, and the other set being located to determine alignment of the axes of another class of sensor assemblies within the same predetermined z-x plane when the bed is in a second position that is 180.degree.

Abstract: Measuring device comprising a flow meter (26) provided with an inlet and an outlet which are each intended to be connected to a conduit in which a polyphase outflow to be measured flows, originating, for example, from an oil well, and a first valve (28) arranged below the flow meter (26), the flow meter being mounted generally vertically. According to the invention, the device furthermore comprises a branch passage (34), provided with a second valve (36), opening above the flow meter, so that it can be filled selectively with liquid using this branch passage (34).

Abstract: A method and apparatus for product recovery of polyolefins, particularly high molecular weight amorphous poly alphaolefins, wherein the use of water during the method is significantly decreased and wherein the intermediate stage of storing and drying the chunk form of the polyolefin is eliminated. Polyolefins produced in a reactor are heated and mixed by sigma blades in a kneader-extruder to remove any unreacted monomer(s). The polyolefin material in a liquid form is then transferred directly to an extruder to further remove any unreacted monomer(s) and catalyst(s). The invention further includes a method of measuring the inventory in a vessel using a gas of known quantity and known thermodynamic properties.

Abstract: A device is described, for the adjustment of the flow rate of a liquid which circulates within thermal convectors or heat exchangers making up part of heating, conditioning or ventilation plants, or apparatus for the thermal treatment of products. The device comprises a body within which a movable shutter is provided, the position of which allows for adjusting the quantity of liquid flowing between at least an inlet duct and an outlet duct, the positioning of the shutter being obtained by way of a suitable actuator.The device comprises a control circuit and an instant flow rate and/or quantity meter of the liquid flowing in one of said ducts, for the automatic and continuous adjustment of the flow, by way of the appropriate positioning of the shutter.

Abstract: A method for measuring the volume of flowing liquids under avoidance of measuring errors owing to undesired high gaseous content, wherein the gaseous content of the liquid flowing through a conduit is measured, the deviation of the detected gaseous content from an allowable value is determined, the volume flow of the liquid is influenced in a plurality of steps or continuously in response to the determined deviation, and the volume of the flowing liquid is measured.

Abstract: A system for dispensing mixed beverages has a processor to control the liquid dispensed at an outlet in dependence upon the demand of a user as input to a keypad. Carbonated water is fed to the outlet by way of tubing and a syrup concentrate is also fed therto by way of a tubing. The water and syrup is mixed in the correct quantities by way of respective proportional valves which adjust the quantity or flow rate of the two consituents fed through a mixing chamber in accordance with flow rate readings provided to the processor by respective flow transducers. The flow transducers measure the speed of flow ultrasonically and are able to provide flow rate readings at a rate of 50 per second. The proportional valves are able to adjust the quantities fed to the mixing chamber at a similar rate such that the mix can be reliably determined even if there are transitory pressure drops or viscosity changes in the system.

Abstract: A pressurized chemical tank is connected to a water line through a restriction (e.g., a gas flow control valve). A vacuum-regulating check valve is for maintaining the vacuum pressure of the gas flowing between the tank and the restriction. A gas flow rate sensor is between the restriction and the water line. The sensor is constructed to be responsive to pressure in the gas line, and can be connected to a remote display and/or storage device. The sensor can also provide a feedback signal to a control system for controlling the flow rate.

Abstract: A modular gas meter comprising a basic meter module, including a solenoid operated gas valve, a gas flow measurement arrangement and a gas valve control system, including a first optical interface which facilitates the transmission of control data to or from the control system, which basic module is adapted to be operatively combined with an add-on module so as to extend meter functionality, which add-on module comprises a module control system, which operates to control functionality and which includes a second optical interface, arranged for communication with the first optical interface when the two modules are mutually operatively combined, so that when functionality demands, an appropriate request signal is transmitted via the optical interfaces to request opening of the gas valve, and a manually operated switch to which the module control system is responsive for sending an enable signal via the interfaces to the valve control system, whereby operation of the gas valve to effect gas supply via the meter

Abstract: An apparatus for measuring the flow rate and pressure of water discharged from a standpipe valve includes a portable tank (10) mounted on wheels (24). A pipe assembly (40), includes a pressure gauge 48), a flow meter (46) and a shut-off valve (44) mounted in series on the tank (40) in fluid flow communication with the tank. A high pressure hose (52) is used to connect the inlet of the pipe assembly (40) to the valve being tested.

Abstract: The device determines the pulsating air mass flow in an internal combustion engine. The device includes a sensor producing an output signal to be evaluated to determine a pulsating air mass flow and a filter device for filtering the output signal to produce a filtered signal in which the signal components characteristic of the air mass flow pulsations and dynamic changes are not attenuated but noise and other spurious signals are attenuated. The filter has a bandpass characteristic with an adjustable center frequency which can be varied as a function of rotation speed as well as a low-pass characteristic. A controller of the internal combustion engine is used to adjust the center frequency of the bandpass characteristic according to engine rotation speed.

Abstract: An air flow sensor unit for an internal combustion engine control system which detects an air flow rate and outputs an optical signal corresponding to the detected air flow rate to an external equipment including a bridge circuit including a temperature sensitive resistor which detects the air flow rate and outputs a first electrical signal indicative of a voltage amplitude corresponding to the detected air flow rate; a first converting circuit which converts the first electrical signal outputted from the bridge circuit into a second electrical signal indicative of a digital value corresponding to the voltage amplitude of the first electrical signal; a second converting circuit including a laser diode, for converting the second electrical signal outputted from the first converting circuit into the optical signal having the same digital value as that of the second electrical signal; a housing for accommodating the bridge circuit, first converting circuit and second converting circuit; and an apparatus of a len

Abstract: The invention features a method and apparatus of determining the absolute and/or relative carriage height of a forklift truck having an extendable mast. The hydraulic fluid displacement is converted to electrical signals to obtain the carriage height. A hydraulic flow sensor has two proximity sensors to detect motion (i.e., the speed and direction) of the fluid and to provide an electrical signal. A conversion factor is applied to the signal to precisely determine the carriage height. The conversion factor compensates for the sensor asymmetrical flow and frequency characteristics, and for the fluid kinematic viscosity characteristics.

Abstract: This invention includes straightening and curving air flow within an environmental test chamber so as to improve the testing of a mass air flow meter by maintaining a uniform air flow velocity profile and constrain the size of the environmental test chamber. Such size constraint facilitates the task of maintaining a desired environment within the chamber.

Abstract: A flowmeter for measuring the volumetric discharge in an open channel makes two measurements: (1) velocity at a fixed point, and (2) fluid level. A level-discharge function which is a function of level alone is then generated in response to the measured level, and the discharge function and velocity measurement are multiplied to obtain the volumetric discharge. For more accuracy, in a conduit through which fluid is flowing, a single velocity measurement at a point has a value v.sub.s, from which is inferred the effects of velocity profile in the conduit. A flowmeter in a second embodiment makes use of this such that a level-velocity-discharge function directly produces the volumetric discharge, using inputs from the velocity and level signals. In a third embodiment, when the conduit is full, the level measurement is dispensed with, and a velocity-discharge function directly produces the volumetric discharge, using input from the velocity sensor.

Abstract: A flowmeter comprises an output cut-off circuit controlled by a command signal generated by a flow switch, wherein the flow switch generates a command signal switching on the transmission of an electrical signal representing the flow rate of media to an output terminal, when the flow rate of media being measured by the flowmeter is greater than a preset threshold value, and switches off the transmission of the electrical signal representing the flow rate of media to the output terminal, when the flow rate of media is less than the preset threshold value.

Abstract: An arrangement for measuring a liquid flow through a liquid spray nozzle which provides liquid from a header in a flue gas desulfurization system includes a spool having an outlet and connected to the header and the nozzle for channeling the liquid from the header to the nozzle. The outlet permits an amount of the liquid to be channeled out of the spool; and a conduit is connected to the outlet of the spool for channeling the amount of the liquid from the outlet to the outside of the vessel. A measuring device such as a pressure gauge is located outside of the vessel and is operatively connected to the conduit in order to determine the liquid flow of the nozzle based on the pressure of the liquid channeled through the conduit. A flushing device is operatively connected to the conduit for channeling a flushing liquid through the conduit in order to clean the conduit of any deposits or build-up. A plurality of valves are used in order to regulate liquid flow and purge water flow.

Abstract: Measuring and regulating valve assembly which includes a butterfly valve and a measuring flange, the measuring flange being situated upstream of the butterfly valve, the distance between the valve and the measuring flange being at least 0.6.times. the nominal passageway diameter, the assembly including a control box that has an adjustable stop that may contact a cam of a sleeve connected to an operating means whereby the maximum opening angle of the butterfly valve can be restricted in a reproducible manner, the sleeve being connected to the valve shaft.

Abstract: Highly reliable measurements of the fluid and/or fluid flow in a conduit are obtained by insertion within the conduit, upstream of a fluid measuring or sampling device, of a fluid flow straigntening and displacement apparatus which serves to stabilize, homogenize and condition the fluid flow and form at the device a uniform, axially centered, axially symmetrical, well defined and accurately measurable flow profile of large means flow diameter. The flow straightening and fluid displacement apparatus comprises, in sequence in the direction of fluid flow, a first swirl mitigating and flow straightening device, a fluid displacement member comprised of two oppositely facing frustums jointed at their larger ends and mounted coaxially within the conduit, and a second flow straightening device. Advantageous combinations of the flow straightening and fluid displacement apparatus with known measuring and sampling devices are provided.

Abstract: The present invention is directed to a method for determining the mass flow rate of solids in a cyclone separator having an inlet for receiving a mixture of solids and gases and an outlet for discharging the separated gases. The method includes measuring the gas pressures at the inlet, in the separator, and at the outlet, and utilizing these pressure values to establish a ratio of the pressure drop across the outlet to the pressure drop across the separator. This ratio is then used to determine the mass flow rate of the solids into the cyclone.

Abstract: Apparatus and method are disclosed for measuring the quantity of a liquid, such as crude oil, transferred to or from a storage tank with all measurements being taken through an opening near the bottom of the tank. A water detecting probe is extendable through the opening a selected distance below the opening in order to detect the presence of water at a selected level below the opening and generate a detection signal. A sampling device is connectable to the opening for taking samples of the liquid transferred to or from the tank. A pressure sensor is connected to the opening for generating a pressure signal indicative of the pressure of the liquid in the tank. A computer is provided for using the pressure signal to generate a level signal indicative of the level of the liquid in the tank.

Abstract: The specification discloses an apparatus for assessing the ingress of air into a steam system which includes a steam condenser having an exit, a vacuum pump arrangement for maintaining the exit under a partial vacuum, and pipework connecting the exit to the vacuum pump arrangement. A pitot probe is positioned at a first monitoring point in the pipework to sense the total dynamic and static pressure of the entire flow in that pipework. A second probe is positioned at a second monitoring point which is displaced from the first monitoring point and adjacent the exit from the condenser, to sense the static pressure and temperature at that second monitoring point. An indication of the amount of air flowing past said first monitoring point is derived from the total pressure, the static pressure and the temperature, which are measured at the first and second monitoring points.

Abstract: A method of metering the rate of flow of a dye solution from a spray nozzle for dyeing an elongate fabric material comprises spraying a test liquid equivalent to the dye solution over a plate member impervious to liquid, accumulating the test liquid and measuring the rate of its flow per unit length of time, thereby evaluating the performance of the spray nozzle. The rate of flow of such test liquid is simulated for actual dyeing operation to pre-adjust the jet pressure of the spray nozzle and/or the spaced of feed of the fabric material so as to attain uniform intensity of color on the dyed material.

Abstract: In a meter counter assembly of a gas meter, a rotatable shaft of a gear train is journaled in a bore that extends through a support plate mounted in the housing of the counter. The plate is of a porus material, forming capillary passages for the transmission of lubricant therethroughout. A portion of the support plate extends into a lubricant reservoir in the housing. In use, lubricant migrates through the capillary passages to the bore from the reservoir for lubrication of the shaft.

Abstract: An apparatus for measuring the flow rate of an intake air flowing through an air passage which communicates with an internal combustion engine is disclosed. The apparatus includes a heat-generating resistor element disposed in the air passage for detecting the flow rate of the intake air in the air passage, and at least one protective member disposed on upstream and/or downstream side(s) of the heat-generating resistor element as viewed in an air flow direction in which the intake air flows through the air passage, so as to extend in a direction perpendicular to the air flow direction. The protective member(s) is/are formed of a water-absorptive porous material, and have a plurality of holes formed through the thickness thereof in the air flow direction.

Abstract: A system for measuring fluid flow through a plurality of holes in a part, such as an engine combustor part, comprises a hood, including a leak-resistant seal, the seal being capable of receiving or engaging an inner or outer side of the wall of the part; a pump or variable pressure blower coupled to the hood by a fluid flow line; a pressure sensor to measure pressure inside the hood; a controller coupled to the pump or blower to establish a predetermined pressure inside the hood in response to the pressure sensor, and a flow sensor in the fluid flow line to measure the fluid flow rate through the fluid flow line.

Abstract: Apparatus for measuring fluid flow through a conduit including a measuring electrode and a ground electrode disposed in the conduit and connected to form an electrolytic cell, so that a voltage can be applied between the electrodes in order to cleanse deposits from the measuring electrode, and gases generated during the cleansing step can then be dissipated. Methods for measuring the fluid flow in such a manner are also described herein.

Abstract: A compact gas consumption measuring device which is flexibly insertable into existing gas installations includes in a single compact housing, a permanently installed flowmeter, and a pressure-control device and a shut-off valve, which are modularly constructed in two parts. Additionally, several spatially staggered gas admission and gas discharge ports are provided. To this end, the housing possesses, on the front side, slide-in openings into which one basic module each is inserted and secured. Assigned to each basic module are a function module and a blank module which, depending on the requirement, are insertable into the basic module and are sealable gastight to the outside. The basic modules and the assigned function modules are each provided with a gas intake and gas discharge wells and are connected to each other in such a way that they are connected in series to the flowmeter as well as to the connecting ports for gas admission and for gas exhaust.

Abstract: A flow rate measuring apparatus includes a measuring pipe in which a fluid to be measured flows, a flowmeter for measuring a flow rate of the fluid to be measured flowing in the measuring pipe, and a cleaning flow generator for removing an adhesive substance in the measuring pipe by using the fluid to be measured, thereby correctly performing flow rate measurement by the measuring pipe. The cleaning generator removes adhesive substances by charging a high-pressure gas into the flow path of the fluid to be measured.

Abstract: An apparatus for measuring fluid flow has a measuring device operating in accordance with the Coriolis principle. The measuring device has an oscillating conduit wherein the fluid to be measured flows through the conduit, and a sensor for sensing the movement of the conduit and generating output signals indicative of the movement. The measuring device generates a measurement signal based on the sensor signal indicative of the flow rate of fluid through the conduit. A counting device is coupled to the measuring device for receiving the measurement signal and calculating the flow rate of fluid through the conduit based on the measurement signal.

Abstract: A compact dual microanemometer-based flow meter for a gaseous fluid includes a dynamic microanemometer flow sensor located in a measuring nozzle of reduced diameter directly exposed to the main fluid flow stream and a static microanemometer sensor located so as to be in communication with the main flow stream but not in direct contact with the main flow stream. Particulate matter is excluded by a particulate trapping system located upstream of the flow sensors and has a plurality of sequentially encountered particulate traps including dead-end trap and settling traps and a honeycomb laminarizing device is positioned in the stream between the particulate trapping system and the microanemometers.

Abstract: A fluidic flowmeter is located downstream of a valve. A wire gauze or net having small meshes is located on the upstream side of a nozzle forming the inlet to the fluidic element to stabilize flow.

Abstract: A flow rate measuring apparatus includes a measuring pipe in which a fluid to be measured flows, a flowmeter for measuring a flow rate of the fluid to be measured flowing in the measuring pipe, and a cleaning flow generator for removing an adhesive substance in the measuring pipe by using the fluid to be measured, thereby correctly performing flow rate measurement by the measuring pipe. When the flowmeter is an electromagnetic flowmeter, the cleaning flow generator prevents the adhesive substance from resistively connecting electrodes for induced electromotive force detection. When the flowmeter is an ultrasonic flowmeter, the cleaning flow generator prevents the adhesive substance from interfering with transmission of an ultrasonic wave in the measuring pipe.

Abstract: An electrical isolation system for monitoring liquid flow rate from pumping equipment housed within a confined enclosure, wherein the flow rate signals are developed into optical signals which are conveyed via fiber optic cables from within the enclosure to control modules outside the enclosure. The control for operating the system may thereby be wholly electrically isolated from the pumping equipment.

Abstract: A water strainer, water meter, and crossover check valve structurally and functionally integrated within a single housing having a single access port. A water strainer, including a screened portion and a solid floor, diverts debris from the water flow path into a collection chamber in the bottom portion of the housing. The water strainer defines an interior volume within the housing, designed to pass strained water and protect the impeller assembly of the water meter located therein. A strainer outlet pipe, extending from an outlet port into the interior volume of the housing, may be included to house both the impeller and the check valve. The single access port provides for service of the interior components and removal of collected debris.

Abstract: Apparatus is provided for use as an in-line fluid flow monitor through filter media of a variety typically employed in households upstream of a kitchen faucet. The apparatus includes a housing with an input port leading to a housing cap within which a turbine chamber retains a rotating turbine. The rotating turbine is coupled to a reduction gear train positioned within a gear housing, in turn, retained within the body of the housing in a reduction gear chamber. Fluid communication is provided from the turbine chamber to the gear reduction chamber. The gear reduction chamber ends in an eccentric output which drives the pawl of a pawl and ratchet assembly forming a part of a rotatable valve. This rotatable valve rotates in increments as a camming stem affixed thereto moves along a camming surface until encountering a slot component.

Abstract: A control system apparatus for a fluid distribution system includes a low-voltage circuit and a positive displacement disc in a throughput line such that as fluid displaces the positive displacement disc a magnet associated therewith is also rotated. The rotating magnet sets up a magnetic flux that is sensed by a switch in close proximity to the rotating magnet and when the switch closes a low-voltage current is allowed to pass to a time delay relay, which in turn monitors the duration and strength of the low-voltage current and can, under program control, further actuate another branch of the low-voltage circuit, which causes a normally open valve to be closed by a solenoid. As the solenoid is actuated, the water flowing in the throughput line is shut off.

Abstract: A dynamic leak detector is connected to a fluid flowmeter prover. The prover has a measurement chamber with a fluid inlet and a fluid outlet and a barrier which moves axially through the chamber between the fluid inlet andc the fluid outlet. First and second spaced apart seals between the barrier and the chamber interior prevent fluid from passing through the barrier. The leak detector is connected to the space between the first and second seals and urges fluid to flow out through the seals into the chamber, while the prover is operating. If more than a threshold amount of fluid passes through the seals during a test run, the operator is alerted and the test run is rejected.

Abstract: Apparatus is provided for use as an in-line fluid flow monitor through filter media of a variety typically employed in households upstream of a kitchen faucet. The apparatus includes a housing with an input port leading to a housing cap within which a turbine chamber retains a rotating turbine. The rotating turbine is coupled to a reduction gear train positioned with a gear housing, in turn, retained within the body of the housing in a reduction gear chamber. Fluid communication is provided from the turbine chamber to the gear reduction chamber. The gear reduction chamber ends in an eccentric output which drives the pawl of a pawl and ratchet assembly forming part of a rotatable valve. This rotatable valve rotates in increments as a camming stem affixed thereto moves along a camming surface until encountering a slot component.

Abstract: An infusion pump system comprising means for measuring internal diameter of an associated pump supply tube formed from a flexible material, such as plastic or rubber. The means for measuring internal diameter may comprise an ultrasound system including at least one transmiter and one receiver, as well as an evaluation unit. Alternatively, a mechanical system may be employed in the form of a counterpressure unit arranged perpendicular to the axis of the supply tube and including a movable plunger and an abutment surface for compression of the supply tube to be measured. A measurement and evaluation unit associated with the counterpressure unit determines the distance traversed by the movable plunger. The internal diameter of the tube may be determined by generating a force-displacement diagram. In accordance with one embodiment, the movable plunger is a pumping rod of a linear peristaltic pump.

Abstract: A nonintrusive flow sensing system (10) and related method are provided for monitoring fluid flow within a conduit (14), particularly such as a liquid flow (12). The sensing system (10) includes an array of ultrasonic transducers (18, 20, 24, 26) mounted on the conduit (14) and adapted to send and receive pulsed ultrasonic signals bidirectionally across the conduit with an upstream-downstream component of direction, and through the conduit in longitudinal and circumferential directions. Signal transit times are processed to obtain accurate measurements of liquid flow velocity, temperature and pressure.

Abstract: A system for metering the volume of a liquid, e.g. ink, supplied by a positive displacement pump to an installation, such as a printing press, employs a device for generating a first series of signals each indicative of completion of a pumping stroke. The speed of the pump is also sensed to generate a second series of signals each indicative of the positive supply of liquid by the pump. The signals of the first series are counted only in the presence of a corresponding signal of the second series. The result is an accurate numerical indication of the total volume of liquid pumped.

Abstract: A flow sensor comprising a flow passage, a rectifying element such as a plurality of screens or a honeycomb structure or both, arranged in the flow passage, a flow passage reducer for reducing the flow passage behind the rectifying element, and a thermal flow sensor, such as for example a micro bridge sensor, mounted at a location immediately behind the reducer. The above structure can largely reduce disturbance in flow to thereby enable highly accurate measurements of a wide range of flow without a low pass filter.

Abstract: A fluid flowmeter includes a sensor mounted on or in the inner surface of a conduit for measuring fluid flow through the conduit where the sensitivity of the sensor is dependent upon the thickness of the fluid boundary layer extending over the sensor. According to the invention, fluid is drawn out of the conduit through an aperture located a predetermined distance upstream of the sensor to remove the boundary layer developed upstream of the sensor thereby rendering the sensor immune to fluctuations in the thickness of the removed boundary layer. At the same time, a fresh boundary layer of reduced thickness and greater stability is initiated over the sensor so as to improve the sensitivity and repeatability of the sensor.

Abstract: The flow of a gas containing entrained particulate matter may be accurately, reliably and continuously measured, utilizing an apparatus comprising a self-cleaning orifice, including counter-rotating continuously scraped cylinders, and thermophoretic pressure taps.

Abstract: It is often desirable to meter multiphase fluid flow in pipes (e.g. bore holes). In order to obtain reliable/accurate flow rate measurements it is known to incorporate obstructions in the flow path to cause homogenization. A non-obstructive method of homogenizing the flow of a multiphase mixture of fluids in a bore hole comprises providing in the bore hole a pipe section which has an internal surface with a step discontinuity, whereby when fluid flows through the pipe section, turbulent stresses are caused by the discontinuity, leading to homogenization by turbulent mixing. There is disclosed a flow meter which comprises a pipe length with a first section having a step change in cross-section for homogenizing fluid flow therethrough, in series with a venturi flow meter in which a differential pressure can be measured in a second pipe section having a smooth change in cross-section.

Abstract: A mass flow meter probe having an upstream tube and a downstream tube that extends into a main gas flow conduit is disclosed. The sensor for the mass flow measurement is located in the bore of a housing connecting the tubes and by incorporating the sensor into a valve that can block flow between the tubes, the mass flow meter can be calibrated in the field. The probe can be used as differential pressure device for flow measurments, when the valve is closed. A means for cleaning pressure ports is also disclosed.

Abstract: An apparatus for measuring the flow rate of electrically conductive liquids includes two coils disposed in succession as seen in the flow direction of a liquid. The coils are switched in alternation as a primary and a secondary coil. One of the coils is excited with an alternating current as the primary coil, and voltage induced by the excitation in the other of the coils as the secondary coil is measured.

Abstract: A positive displacement flushable flow meter has sensing elements that are rotated by and at a rate in accordance with a flow of fluid through the flow meter. The flow meter is particularly adapted for measuring the volume flow rate of coating material supplied to spray coating apparatus, and to permit the flow meter to be quickly flushed by means of alternate bursts of relatively high velocity air and solvent, without overdriving the sensing elements and damaging the flow meter, a bypass valve is provided. During a spray coating operation, the bypass valve is closed and all of the coating material flows past and rotates the sensing elements. During a flushing operation, the bypass valve is opened to divert some of the relatively high velocity flow of air and solvent around the sensing elements, while allowing a controlled and limited amount of air and solvent to move past and rotate the elements to clean them without causing them to be overdriven.

Abstract: A combination air flow and vacuum meter comprising a rigid transparent tubular housing having an inlet end, an opposite outlet end adapted for insertion into a central vacuum inlet or the like, a compression spring-mounted piston riding along an air flow controlling cone internal to the body, a vacuum guage mounted on the housing, and a reading scale on the housing that is calibrated with the spring and cone for indicating flow rate upon spring-loaded deflection of the piston. A plate or valve is attached to the housing and movable between open and closed positions to prevent air flow through the meter to measure vacuum in the closed position and to permit air flow through the meter to measure both vacuum and air flow rate in the open position.