Abstract: An assembly includes an inlet hub (112) coupled to a first flow passage (124) located within a flow control module, the first flow passage having a first flow bore, a flow meter (144) associated with the first flow bore and positioned for top-down fluid flow, a choke (109) disposed in a second flow passage (136) having a second flow bore, and an outlet hub (119) coupled to a distal end of the second flow passage. A system includes a flow control module assembly (902) having an inlet (912) and at least two outlets (914, 916), a main line (920) in fluid communication with the inlet, a first branch line (922) coupled to the main line and to a first outlet (916) of the at least two outlets, and a second branch line (924) coupled to the main line and to a second outlet (914) of the at least two outlets, and a tie-in connector (918) coupled to the inlet of the flow control module assembly.

Abstract: A method for determining an airflow volume through an air filter is presented. A negative pressure is created within a system housing of an air handling system. Particulate matter is filtered on a filter media of an air filter. A displaceable baffle is progressively moved baffle in proportion to an accumulation of particulate matter on the filter media, wherein the displaceable baffle is movably mounted within a bypass conduit of an airflow sensor device. An output voltage is identified from a magnetic field sensor, wherein the output voltage is proportional to a magnetic flux density of a magnetic field from an actuation magnet mounted on the displaceable baffle. A position of the displaceable baffle is determined based on the output voltage generated by the magnetic field sensor. An accumulation of particulate matter on the filter media is determined based on the position of the displaceable baffle.

Abstract: The present disclosure provides a fluid sensor and a mass flow controller. The fluid sensor comprises at least two measuring tubes whose diameters have a proportional relationship. The fluid sensor provided by the present disclosure can guarantee measurement accuracy in a whole measurement range and also can improve device reliability.

Abstract: The subject matter of this specification can be embodied in, among other things, a fluid flow measurement apparatus includes an inlet configured to flow a dynamic fluid flow, an outlet configured to flow the dynamic fluid flow, a first fluid conduit fluidically connected between the inlet and the outlet, configured with a first predetermined geometry, and configured to flow a first portion of the dynamic fluid flow, a second fluid conduit fluidically connected between the inlet and the outlet, configured with a second predetermined geometry, and configured to flow a second portion of the dynamic fluid flow, and a first flow meter configured to measure the second portion of the dynamic fluid flow.

Abstract: A physical quantity measurement device includes a passage flow channel having an inflow port and an outflow port, a branch flow channel branched from the passage flow channel and having a branch inlet into which the fluid flows from the passage flow channel. The branch flow channel has an inclined branch path inclined with respect to the passage flow channel, and the inclined branch path extends from the branch inlet toward the outflow por. An inclination angle of the branch flow channel at the branch inlet with respect to a virtual straight line connecting the inflow port and the outflow port is smaller than or equal to a predetermined value.

Abstract: The physical quantity measurement device includes a passage flow channel, a branch flow channel, and a physical quantity detection unit. A direction along which a pair of opposing surfaces facing each other are arranged is defined as a width direction, and a direction orthogonal both to the width direction and an inflow direction of fluid through an inflow port is defined as a height direction. An inner peripheral surface of the passage flow channel includes a height narrowing surface that narrows the passage flow channel so that a height dimension of the passage flow channel along the height direction is gradually reduced toward the outflow port while reserving a parallel region extending linearly between the inflow port and the outflow port parallel to the inflow direction. The height narrowing surface is not exposed through the inflow port in the inflow direction.

Abstract: An assembly includes an inlet hub (112) coupled to a first flow passage (124) located within a flow control module, the first flow passage having a first flow bore, a flow meter (144) associated with the first flow bore and positioned for top-down fluid flow, a choke (109) disposed in a second flow passage (136) having a second flow bore, and an outlet hub (119) coupled to a distal end of the second flow passage. A system includes a flow control module assembly (902) having an inlet (912) and at least two outlets (914, 916), a main line (920) in fluid communication with the inlet, a first branch line (922) coupled to the main line and to a first outlet (916) of the at least two outlets, and a second branch line (924) coupled to the main line and to a second outlet (914) of the at least two outlets, and a tie-in connector (918) coupled to the inlet of the flow control module assembly.

Abstract: Systems and methods for detecting inclement weather in the vicinity of an aircraft engine are described herein. At least a first engine parameter and a second engine parameter are obtained, each engine parameter varies with changing weather conditions. An arithmetic value is determined as a function of at least the first engine parameter and the second engine parameter. The arithmetic value varies with changing weather conditions. A rate of change of the arithmetic value is determined. Inclement weather is detected when the rate of change exceeds a threshold.

Abstract: A measuring device has a flowmeter, an inlet tube and an outlet tube. The flowmeter has a measuring tube that is connected to the inlet tube and to the outlet tube. To provide a measuring device that allows for measurements using a flowmeter, in particular of the liquid components of medium in the measuring tube, independent of whether the medium is made to flow or is stagnant, wherein the measuring tube is completely filled at least with the liquid components of the medium when the medium is stagnant the inlet tube, the measuring tube and the outlet tube form a siphon, wherein the siphon is designed and aligned in respect to the vector of the gravitational field of the earth so that, when a medium initially flows through the siphon and then the flowing of the medium stops, the measuring tube is completely filled with the stagnant medium.

Abstract: Mass flow meters and mass flow controllers that include mass flow meters are disclosed. A mass flow meter includes a main flow path for a gas, and a bypass with a length, L, within the main flow path. The bypass includes a continuous flow section including a plurality of continuous capillary tubes that each have a length, L. The bypass also includes n flow segments forming n?1 spaces within the bypass where n is greater than or equal to 2, and each of the flow segments has a plurality of capillary tubes. The mass flow meter also includes at least one thermal sensor including a sensor tube, and the sensor tube is positioned across at least one of the flow segments to divert a portion of the gas around the at least one of the flow segments and provide a measured flow signal in response to the diverted portion of the gas.

Abstract: In an embodiment, the present disclosure pertains to a pressure probe. In some embodiments, the pressure probe includes a tube having an output end, an internal passage, an axial run, and pressure orifices axially aligned along a downstream side of the axial run. In some embodiments, the pressure orifices are in communication with the output end through the internal passage and an upstream side of the axial run that is opposite from the downstream side of the axial run and does not include a pressure orifice. Additionally, in some embodiments, the downstream side is perpendicular to airflow.

Abstract: The object of the invention is to obtain a thermal flowmeter which effectively causes water droplets to be directed to a discharge port when the water droplets adhered to a wall surface of a first passage are drawn into a third passage portion. A thermal flowmeter of the present invention includes a sub-passage that takes a measurement gas flowing through a main passage; and a flow detection unit that measures a flow rate of the measurement gas by performing heat transfer with the measurement gas flowing through a sub-passage. Further, the sub-passage includes a first passage, a second passage portion branching in the middle of the first passage portion to be directed toward the flow detection unit; and a third passage portion branching in the middle of the second passage portion to be directed toward a third outlet, and a pressure loss generation means is provided between a third inlet and the third outlet of the third passage portion.

Abstract: A flow sensing module with a bypass channel is provided. The flow sensing module may include a body portion and a flow sensor. The body portion may include a main fluid inlet, a main fluid outlet, a main fluid channel extending between the main fluid inlet and the main fluid outlet, a bypass fluid inlet and a bypass fluid outlet each configured to be in communication with the main fluid channel, and a bypass fluid channel extending between the bypass fluid inlet and the bypass fluid outlet. The flow sensor may be disposed in the bypass fluid channel to sense a flow rate of a fluid in the bypass channel. No pressure drop element is disposed in the main fluid channel, so the main fluid channel may have a pressure loss of a very small value. Moreover, linearity and sensitivity of the flow sensing module may also be improved.

Abstract: In a drilling system for drilling a borehole with drilling fluid, a flow loop communicates the drilling fluid, and a differential pressure device in the flow loop at a measurement location produces a pressure drop in flow. The measurement location can be between the borehole and a drilling choke or between a mud pump and the borehole. Piping diverts a portion of the flow at the measurement location so a flowmeter can measure the diverted flow portion. A processing unit receives a measured parameter from the flowmeter and determines a diverted flow rate of the diverted portion therefrom to correlate it to a value of the main flow rate through the flow loop at the measurement location.

Abstract: A pump-motor combination includes a motor (30) and a pump (20). The pump has a first rotor (21) and a first housing 300). The motor is an electric motor (30) having a second rotor (31), a stator (33) and a second housing (32). The first (pump) rotor (21) is at least partially coupled, and the second (motor) rotor (31) is completely coupled, to a common rotating shaft (40) in order to enable transmission of rotation of the second (motor) rotor (31) to the first (pump) rotor (21). The pump-motor combination can be installed with the gearbox (G) or transmission of a motor vehicle, to assure supply of lubricant (360) when a primary lubricant pump (350) has not been operating, for example, upon start-up. Use of the common shaft (40) minimizes frictional losses during operation and reduces the cost of manufacture, since fewer bearings are needed.

Abstract: A suction nozzle is provided for a fan with a suction opening for suctioning a fan main flow. The suction nozzle has an opening edge section adjoining the suction opening and having a local outbreak. A flow insert is detachably provided in the local outbreak of the opening edge section. The flow insert forms a bypass leading to the suction opening for a bypass flow leading to the fan main flow. Measuring means are provided in the bypass for the volume flow determination of the fan main flow. A confusor is provided in the bypass. The confusor is formed by a first web and a second web. The first web and the second web circumferentially face one another to form a nozzle channel in the bypass. The nozzle channel has a radially narrowest section. The measuring means are arranged in the radially narrowest section.

Abstract: A balancing valve for adjusting the flow rate of a fluid flowing inside a pipe from upstream to downstream in a longitudinal direction of flow. The balancing valve includes: a check valve and a tubular element simulating a Venturi tube, said valve and element being coaxially connected, respectively, from upstream to downstream in the longitudinal direction of flow of the fluid; a device for detecting the difference in pressure which occurs inside the valve; a valve for adjusting the flow rate of the fluid which flows inside the pipe; wherein: the detection device is arranged between the inside of a first upstream chamber of the check valve and the inside of a central cylindrical portion of the tubular element.

Abstract: Continuous pressure sensing is important for patients with several different conditions. We provide an implantable sensor, based on microfluidic principles, which in one example has 1 mmHg limit of detection, high sensitivity and excellent reproducibility. This sensor has an optical interface, which enables pressure to be read with, for example, a cell phone camera. The design and fabrication, along with the option of self-monitoring are promising steps toward better patient care and treatment.

Abstract: An apparatus, system and method providing a fluid flow suitable to grow and maintain living cells in the fluid flow are disclosed. The apparatus includes a fluid displacement apparatus capable of providing at least one of positive and negative displacement of the fluid and configured to indirectly displace the fluid, an in-line flow sensor configured to directly measure the fluid flow, and a feed-back control in communication with the fluid displacement apparatus and the in-line flow sensor, wherein the feed-back control is configured to continuously control the fluid flow in response to the flow sensor measurements.

Abstract: A system for metering gas a fluid stream includes a primary conduit and a secondary conduit coupled to the primary conduit such that the secondary conduit receives a portion of a fluid stream passing through the primary conduit. A flow manager disposed in the primary conduit is configured to maintain a predetermined relationship between at least one first physical characteristic of the fluid stream and at least one second physical characteristic of the portion of the fluid stream. A sensor measures a flow characteristic of the portion of the fluid stream and a processor determines a flow parameter of the fluid stream based, at least in part, on the predetermined relationship and one of an amplitude or temporal characteristic of the electrical signal.

Abstract: An airway adapter includes a housing and a pressure transducer. The housing includes a flow path having a first end and a second end, a first pressure port that communicates with the flow path, and a second pressure port that communicates with the flow path. The first pressure port is spaced apart from the second pressure port. The flow restriction is disposed in the flow path between the first and second pressure ports that creates a pressure differential therebetween. The pressure transducer generates a signal that reflects the differential pressure created by the flow restriction between the first and second pressure ports, wherein the pressure transducer includes an optical interferometer.

Abstract: The design and structure of a vortex flow meter with large dynamic range utilizing a micro-machined thermal flow sensing device for simultaneously measurement of volumetric flowrate via vortex street frequency as well as mass flowrate is exhibited in this disclosure. The micro-machined thermal flow sensing device is placed at the central point of a channel inside the bluff body where the channel direction is not perpendicular to the direction of fluid flow in the conduit. The thermal flow sensing device is operating in a time-of-flight principle for acquiring the vortex street frequency such that any surface conditions of the device shall not have significant impact to the measured values. With a temperature thermistor on the same micro-machined thermal flow sensing device, the vortex flow meter shall be able to output the fluid temperature as well as the fluid pressure.

Abstract: Glaucoma is the second most common cause of blindness in the global world. It is a multifactorial disease with several risk factors, of which intraocular pressure (IOP) is the most important. IOP measurements are used for glaucoma diagnosis and patient monitoring. IOP has wide diurnal fluctuation, and is dependent on body posture, so the occasional measurements done by the eye care expert in clinic can be misleading. We provide an implantable sensor, based on microfluidic principles, which in one example has 1 mmHg limit of detection, high sensitivity and excellent reproducibility. This sensor has an optical interface, which enables IOP to be read with, for example, a cell phone camera. The design, fabrication, along with the option of self-monitoring are promising steps toward better patient care and treatment for this devastating disease.

Abstract: Methods and systems to measure a volumetric fluid flow rate through a fluid flow passage, such as an air handler of a HVAC system, are described. The method may include obtaining a flow rate measurement in a measuring section, and calculating a total flow rate based on a correlation between the obtained flow rate measurement and the total flow rate. The method may also include blocking a portion of the fluid flow passage so that when a minimal volumetric fluid flow rate is provided, the flow rate measurement obtained in the measuring section is at about a minimal sensitivity flow rate requirement.

Abstract: An in-line flowmeter for large diameter pipes includes an outer pipe with a diameter equal to that of the pipe to which it is coupled and an inner measuring tube carrying a portion of the flow, the flow through the measuring tube being sensed by a flowmeter associated with the measuring tube and with the total combined flow rate out of the in-line flowmeter calculated from the sensed flow through the measuring tube.

Abstract: A device for carrying out at least one measurement and for removing milk samples from a milking machine, through which milk can flow and which contains an air separation device, a measurement device, a sample removal device and a channel that is open to the top. The air separation device is designed to separate the milk from air with which the milk is mixed. The measurement device is device and is connected to the air separation device by a first milk outlet opening of the air separation device and designed to carry out one or more measurements with the milk flowing through the device. The sample removal device is designed to supply milk to a sample container.

Abstract: A pitot tube system having a pitot tube containing a porous hydrophobic fabric that blocks water and contaminants from reaching a pressure sensor. The distance in the pitot tube between the fabric and a front orifice of the tube is less than 2.4 times the height of the orifice, and preferably less than or equal to 0.38 times the height. The section of the tube through which the fabric extends defines an opening characterized by a minimum dimension greater than 0.15 inches, and preferably being at least 0.21 inches. The tube is a removable structure that attaches to a mount that forms a passage for communicating the pressure in the tube. That passage contains a second porous hydrophobic fabric that also blocks water and contaminants from reaching a pressure sensor.

Abstract: Disclosed are apparatus and methodology for measuring gas flow using a modular unit as a gas measurement module. The modular unit can be made of molded plastic, cast metal, or other material. A gas meter can include the gas measurement module. The gas measurement module includes a chamber with an inlet and an outlet. An obstacle in the chamber is configured to generate an oscillating gas jet when gas flow into the chamber is at or above a threshold flow rate. The gas measurement module includes a dual sensing assembly with one or more first sensors using a first gas flow sensing technology and one or more second sensors using a second gas flow sensing technology.

Abstract: An in-line flowmeter for large diameter pipes includes an outer pipe with a diameter equal to that of the pipe to which it is coupled and an inner measuring tube carrying a portion of the flow, the flow through the measuring tube being sensed by a flowmeter associated with the measuring tube and with the total combined flow rate out of the in-line flowmeter calculated from the sensed flow through the measuring tube.

Abstract: A method and apparatus for measuring a resultant flow delivered by a pump coupled to an over pressure valve, the method comprising the steps of: measuring, using a first flow meter, feed flow to the pump; measuring, using a second flow meter, return flow from the over pressure valve; and calculating resultant flow, at least in part, by subtracting measured return flow from measured feed flow. A pump power modification module can further modifying the pump output pressure to enable pressure profiling.

Abstract: A flow sensor for measuring the flow of a gaseous or liquid medium with a sensor housing in which, between an inlet channel and an outlet channel, a flow channel extends that comprises a main channel and a measuring channel that is arranged parallel to the main channel. At least one main channel choke point is arranged in the main channel, and the measuring channel comprises a sensor element for measuring the flow. A measuring channel choke point in the measuring channel on the inlet and/or the outlet side, is arranged with the main channel choke point having at least one passage and the measuring channel choke point having a passage, both passages being of identical shape and extending parallel to each other in the flow direction.

Abstract: A system for testing the efficiency of a test HEPA filter, the system comprises a dilution system and a sampling system. The dilution system processes samples collected upstream of the test HEPA filter. The dilution system has a test portion and a calibrated portion. The calibrated portion aids in determining the dilution ratio of the test portion thereby rendering the dilution system self-calibrating. The sampling system receives upstream samples via the dilution system, and downstream samples collected directly downstream of the test HEPA filter. The sampling system incorporates a flow rate balancing system to ensure accurate counts with respect to samples collected upstream and downstream of the test HEPA filter. The sampling system works well with particle counters fitted with relatively weak fans to draw in samples for counting; this is achieved by connecting the sampling system to both the inlet and exhaust outlet of a particle counter.

Abstract: A bypass passage receives a part of air flowing through a duct. A sub-bypass passage is branched from an intermediate portion of the bypass passage to separate dust contained in air flowing through the duct. A flow rate sensor is located in the sub-bypass passage for detecting the flow rate of air. A first wall surface and a second wall surface of the bypass passage are located upstream from the branch. The first wall surface is located on the side of the branch. The second wall surface is opposed to the first wall surface. Both the first wall surface and the second wall surface are curved to direct airflow to move away from the branch.

Abstract: An all-electronic utility gas meter using with micromachined (a.k.a. MEMS Micro Electro Mechanical Systems) silicon sensor to measure gas metrology data for custody transfer or tariff in city gas metering application is disclosed in the present invention. The meter has two separate metrology units. One of the units is located in the main flow channel with the insertion probing configuration while the other is configured as a bypass unit assembly with the main metrology unit. The bypass metrology unit can perform independent metrology tasks and can be exchanged onsite during service, maintenance or repair without dismantle the meter from the service pipeline. The bypass metrology unit also can be used to compare the measured data from time to time and performance self-diagnosis that shall help the performance and data authentication during the meter field service. Both of the units can be powered by battery or external sources.

Abstract: A plate-like flow sensor is located in a bypass passage such that a front-to-rear direction of the flow sensor is substantially along a width direction of the bypass passage. The flow sensor divides a flow from its upstream into a first flow, which passes on its front side, and a second flow, which passes on its rear side. The bypass passage has a bent portion in which the first flow and the second flow merge on a downstream side of the flow sensor. A flow deflection unit changes a turning quantity of at least one of the first flow and the second flow such that a turning quantity of the first flow and a turning quantity of the second flow are substantially conformed in the bent portion.

Abstract: A flow rate measurement device has a main flow pipe having a main flow passage through which a gas passes, an orifice for limiting a flow of the gas in the main flow passage, and an auxiliary flow passage block provided with an auxiliary flow passage having one end communicating with a pair of introduction ports opened in the main flow passage on the upstream side of the orifice and the other end communicating with a pair of discharge ports opened in the main flow passage on the downstream side of the orifice. The auxiliary flow passage includes a pair of introduction flow passages having upstream ends respectively communicating with the introduction ports, an upstream auxiliary flow passage having both ends respectively connected to downstream ends of the introduction flow passages, and a pair of discharge flow passages having downstream ends respectively communicating with the discharge ports.

Abstract: Flow sensor assemblies having increased flow range capabilities are disclosed. In one illustrative embodiment, a flow sensor assembly includes a housing with an inlet flow port, an outlet flow port, a fluid channel extending between the inlet flow port and the outlet flow port, and a bypass channel having a pair of taps fluidly connected to the fluid channel at separate locations. A flow sensor for sensing a measure related to a flow rate of a fluid flowing through the fluid channel can positioned in the bypass channel. A pressure differential between the two taps of the bypass channel can drive a fraction of a fluid flowing through the fluid channel through the bypass channel. The flow sensor assembly may be configured to achieve, control, and/or balance a desired fraction of fluid flow through the bypass channel and past the flow sensor.

Abstract: A flow measurement device according to the present invention includes a main flow channel through which fluid flows, and a secondary flow channel unit where the fluid is diverted from the main flow channel, supplied to a flow amount detection element and thereafter returned to the main flow channel. The secondary flow channel unit includes a diversion flow channel through which the fluid is diverted from the main flow channel and returned to the main channel without the fluid being supplied to the flow amount detection element, and a detection channel in which the fluid is diverted from the diversion flow channel and provided to the flow amount detection element. The diversion flow channel includes a smooth flow part in which the fluid flows smoothly between the two ends connecting to the main flow channel, and a first chamber and a second chamber which, adjacent to the smooth flow part, are divided by a partition provided so as to obstruct flow of the fluid.

Abstract: There is disclosed a flow sensor arrangement, comprising a main channel (1) for conveying a fluid, a bypass (2) connected to the main channel (1) for conveying a portion of the fluid supplied in the main channel (1), and a flow sensor (6) for measuring a flow of the fluid portion in the bypass (2). The bypass (2) branches off from the main channel (1) at an angle (?) of less than 90 degrees between an inlet section (21) of the bypass (2) and a supply section (11) of the main channel (1). By such design means, particles can be prevented from entering the bypass (2) by this adversely affecting the measurements.

Abstract: A fluid flow distribution device for a fluid component configured to improve a distribution of a fluid flow therein. The fluid flow distribution includes a plurality of walls. The walls form a chamber configured to receive a fluid flow from a fluid source therein. The chamber is in fluid communication with a fluid inlet of the fluid component and a plurality of flow paths. Each of the flow paths includes an inlet and an outlet. At least one of the walls includes an inner surface, wherein a distance between the inner surface and a plane generally defined by the inlets of the flow paths non-uniformly progressively decreases in respect of a general direction of the fluid flow into the fluid flow distribution device to downwardly direct the fluid flow into the flow paths adjacent thereto.

Abstract: A method and apparatus for measuring a resultant flow delivered by a pump coupled to an over pressure valve, the method comprising the steps of: measuring, using a first flow meter, feed flow to the pump; measuring, using a second flow meter, return flow from the over pressure valve; and calculating resultant flow, at least in part, by subtracting measured return flow from measured feed flow. A pump power modification module can further modifying the pump output pressure to enable pressure profiling.

Abstract: A bypass passage receives a part of air flowing through a duct. A sub-bypass passage is branched from an intermediate portion of the bypass passage to separate dust contained in air flowing through the duct. A flow rate sensor is located in the sub-bypass passage for detecting the flow rate of air. A first wall surface and a second wall surface of the bypass passage are located upstream from the branch. The first wall surface is located on the side of the branch. The second wall surface is opposed to the first wall surface. Both the first wall surface and the second wall surface are curved to direct airflow to move away from the branch.

Abstract: In order to improve a measurement accuracy of a mass flow meter, the mass flow meter comprises a flow rate calculating section that obtains an output signal from a sensor section having a thermosensitive resistive element arranged in a flow channel where a sample gas flows and that calculates a flow rate of the sample gas, a pressure measuring section that measures a primary side pressure in the flow channel, and a flow rate correcting section that corrects the measured flow rate obtained by the flow rate calculating section by the use of the primary side pressure obtained by the pressure measuring section and a gas coefficient determined by an isobaric specific heat of the sample gas.

Abstract: A sensor assembly for use with a fluid transport system is provided. The sensor assembly includes at least two sensors that are configured to measure a rate of flow of a fluid channeled through a pipeline of the fluid transport system. Moreover, the sensor assembly includes an annular collar that is coupled to the two sensors. The collar includes at least a first opening and at least a second opening defined therein. The first opening and the second opening are each sized to receive the two sensors therein such that the two sensors are substantially coaxially aligned with each other. A first sensor of the two sensors is positioned downstream from a second sensor of the two sensors.

Abstract: Techniques for determining one or more fluid flow characteristic values of a structure are disclosed. A fluid flow vector and a pressure gradient vector for a portion of the structure are determined, and a dot/cross product of the fluid flow vector with the pressure gradient vector is obtained to provide a fluid flow characteristic value. The fluid flow characteristic value can be used for modifying the structure to improve fluid flow through the structure.

Abstract: A flow meter includes: a body portion comprising a main flow path wherein flows a fluid to be measured, a first branch flow portion wherein the fluid to be measured branches and flows from the main flow path, a second branch flow portion wherein the fluid to be measured, which branches and flows from the first branch flow portion, flows into the main flow path, and narrow portions for restricting the flow of the fluid to be measured, provided in a primary flow path between the branch flow portions, a branched flow path structuring portion through which flows the fluid to be measured, connected to the branch flow portions; and a fluid measuring portion provided with a sensor disposed facing a flow path that is provided in the branched flow path structuring portion, wherein the sensor measures the fluid based on the detection results of the fluid introduced from the branch flow portions.

Abstract: A flow rate measurement device has a main flow pipe having a main flow passage through which a gas passes, an orifice for limiting a flow of the gas in the main flow passage, and an auxiliary flow passage block provided with an auxiliary flow passage having one end communicating with a pair of introduction ports opened in the main flow passage on the upstream side of the orifice and the other end communicating with a pair of discharge ports opened in the main flow passage on the downstream side of the orifice. The auxiliary flow passage includes a pair of introduction flow passages having upstream ends respectively communicating with the introduction ports, an upstream auxiliary flow passage having both ends respectively connected to downstream ends of the introduction flow passages, and a pair of discharge flow passages having downstream ends respectively communicating with the discharge ports.

Abstract: To provide a flow meter, and a flow volume controlling device equipped therewith, capable of reducing pressure loss while obtaining a flow rectifying effect in a measurement fluid. A flow meter for measuring the flow volume of a measurement fluid, equipped with a flow path wherein the measuring fluid flows, and a flow rectifier that is disposed within the flow path, where the flow rectifier has holes for rectifying the flow of a measurement fluid, and has an area that is wider than the flow path cross-sectional area in a direction that is perpendicular to the direction in which the flow path extends. The flow volume controlling device is provided with the flow meter, a controlling valve, and controlling means for adjusting the flow volume of a fluid that flows through the flow path of the flow meter through controlling the controlling valves based on information regarding the flow volume detected by the flow meter.

Abstract: A flow sensor includes a detector provided on a side surface of a body formed in a tubular shape. First and second passages formed in the interior of the body communicate with an introduction passage of the detector via first and second sensor passages. The first and second sensor passages penetrate through and open respectively on first and second projections, which project at predetermined heights from an inner circumferential surface of the body, communicating with the first and second passages. A fluid, which flows from the first passage and into the first sensor passage, after being guided to the introduction passage and the flow rate thereof detected by a detector, flows through the second sensor passage and into the second passage.

Abstract: An improved flow measuring device, such as a mass flow meter or mass flow controller, providing a high turn-down ratio as compared to prior art devices. In accordance with various embodiments of the invention, a flow sensor includes a sensor flow path that includes one or more restrictions configured to provide the sensor flow path with a non-linear relationship between a pressure drop across the sensor flow path and the flow of fluid through the flow sensor conduit. Such a flow sensor preferably achieves a high turn-down ratio by way of a variable bypass ratio that is directly proportional to the sensor tube mass flow rate so that the turn-down ratio of the mass flow controller will be ideally proportional to the square of the turndown achievable by the flow sensor conduit fluid sensing portion alone. In some embodiments, the restriction can be employed as a part of a fluid seal having an orifice and disposed between a flow sensor portion of a flow meter and a bypass portion of the flow meter.