Abstract: Methods and apparatus utilize a rate of drop in pressure upstream of a gas flow controller (GFC) to accurately measure a rate of flow through the GFC. Measurement of the gas flow through the many gas flow controllers in production use today is enabled, without requiring any special or sophisticated pressure regulators or other special components. Various provisions ensure that none of the changes in pressure that occur during or after the measurement perturb the constant flow of gas through the GFC under test. A pressure regulator is coupled to a gas source. The GFC is positioned downstream of the pressure regulator. A pressure transducer is measuring pressure in a volume between the pressure regulator and the GFC, wherein means are provided for increasing the pressure in the volume.

Abstract: A system and method for measuring the airflow in an air handling unit, includes placing two sensor tubes having apertures along the thereof at specific locations within the air handling unit that, when attached to a manometer, measuring the differential pressure loss across the two locations and, by means of a special readout scale, providing the airflow through the air handling unit.

Abstract: A method and an assembly for sensing a process parameter are provided. The sensing assembly includes a base and a sensor assembly. The sensor assembly includes a sensing element, a first flow channel, and a second flow channel. The first flow channel includes a converging segment, a straightening segment, and a turning segment wherein the turning segment includes a turn radius configured to separate particles from a flow entering the turning segment and the second flow channel is configured to generate a low pressure area downstream of the sensing element. The sensing assembly also includes an extension member extending between the base and the sensor assembly.

Abstract: The present invention provides a subsea apparatus for testing a hydraulic signature which has a fluid supply, a first pressure line coupled to the fluid supply, a second pressure line coupled to the fluid supply; and a pressure recording device operatively coupled to both the first pressure line and the second pressure line. A pressure recording device is capable of storing pre-determined pressure data representative of said pressure lines. The first pressure line functions at a lower pressure than the second pressure line while a pressure recording device records data to allow comparison of actual pressure data on the first and second pressure lines with said stored data.

Abstract: A method for cleaning an internal surface of a narrow diameter channel includes steps of flowing a liquid cleaning medium and a gas through the narrow diameter channel under a flow regime that creates surface flow entities in contact with and sliding along the internal surface of the narrow diameter channel, said surface flow entities having three-phase contact lines and associated menisci, said surface flow entities detaching contaminants with which they come in contact from the internal surface of the narrow diameter internal surface of the narrow diameter channel; and rinsing the internal surface of the narrow diameter channel to remove residual liquid cleaning medium and detached contaminants from the channel.

Abstract: A system and method for determining pressure differences of a fluid flowing through a differential pressure conduit positioned in a wellbore. The system comprises a first pressure measurement circuit positioned at a first pressure measuring station and including a first pressure sensor to generate a first pressure measurement signal indicative of the pressure measured by the first pressure sensor at a first signal point, and a second pressure measurement circuit positioned at a second pressure measuring station and including a second pressure sensor to generate a second pressure measurement signal indicative of the pressure measured by the second pressure sensor at a second signal point. The calculation of the pressure differential between the first and second pressure measuring stations is based on the first and second pressure measurement signals taken or read from the first and second signal points, wherein the first and third second points are symmetrical.

Abstract: A method and device for determining critical buffeting loads on a structure of an aircraft is disclosed. The device (1) comprises means (2, UC) implementing a semi-empirical method for determining the critical loads generated by some buffeting on the structure of the airplane.

Abstract: A sensor structure is provided so that a dynamic pressure effect caused by airflow is avoided as much as possible even when a mass airflow measurement device is integrated with a pressure measurement device, thereby preventing contaminated substances, water droplets, or the like from arriving at a pressure measurement part. In the sensor structure, the mass airflow measurement device is inserted into a sensor insertion port provided in an intake air tube component including an intake air tube and is fixed to the intake air tube, and a pressure measurement device is mounted in a housing structural component of the mass airflow measurement device for measuring the pressure. The pressure measurement device and the inside of the intake air tube are connected by a pressure intake port provided in the housing structural component.

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 differential-pressure flowmeter that can reduce (eliminate) a difference between the ambient temperature of one pressure sensor and the ambient temperature of another pressure sensor so as to allow for accurate and stable pressure measurement is provided, and a flow-rate controller equipped with such a differential-pressure flowmeter is provided. Provided are a body having a main fluid channel through which a fluid, whose pressure is to be measured, flows, and two pressure sensors held by the body and arranged in series relative to the main fluid channel, and a temperature balancer composed of a material with high thermal conductivity is accommodated in a recess that is formed in the body located below the two pressure sensors.

Abstract: Systems and methods are disclosed for differential pressure meters having a constant beta edge boundary defined by fluid displacement members of the meter. In some embodiments, a differential pressure meter may have an interchangeable fluid displacement member, such that each fluid displacement member replaced in the meter maintains a constant beta edge boundary. In other embodiments, a family of differential pressure meters having permanent fluid displacement members may maintain a constant beta edge boundary for each meter of the family of differential pressure meters.

Abstract: The present invention is a flow rate measuring mechanism provided with: a body unit that has an internal flow path through which a target fluid to be measured is configured to flow; and a pressure sensor that is attached to the body unit and senses a pressure of the internal flow path, and configured to calculate a flow rate of the fluid on the basis of the fluid pressure sensed by the pressure sensor, wherein the body unit has a length direction and a surface parallel to the length direction, which is set as a component attachment surface, and to the component attachment surface, the pressure sensor is attached such that a pressure sensitive surface thereof is substantially vertical to the component attachment surface and substantially parallel to the length direction, and thereby, without causing a reduction in pressure measurement sensitivity, makes a width direction size dramatically smaller than before.

Abstract: A pressure sensor for measuring a pressure of a fluid in fluid flow path of a fuel cell system is disclosed. The pressure sensor includes a housing provided with a communication path formed between the fluid flow path and an interior of the housing, the communication path having a hydrophobic feature to militate against a formation and an accumulation of an undesired material within the pressure sensor.

Abstract: The invention relates to a pressure-measuring probe (1) for measuring pressure values of a flow, in particular a supersonic flow, comprising at least one probe head (2) which has a probe surface (8) provided with pressure-measuring points (4,6) and which can be positioned in the flow by means of at least one probe shaft (10). According to the invention, a top side (12) of the probe head (2) and the bottom side (14) of the probe head define a wedge-shaped probe tip (16), wherein pressure-measuring points (4) are arranged at a distance from each other along the circumferential probe tip (16).

Abstract: A volume of fluid moved by a pump, such as a pump in an APD system, may be determined without direct measurement of the fluid, such as by flow meter, weight, etc. For example, a volume of a pump chamber (181) (having a movable element that varies the volume of the pump chamber) may be determined by measuring pressure in the pump chamber and a reference chamber, both while the two chambers are isolated from each other, and after the two chambers are fluidly connected so that pressures in the chambers may equalize. Equalization of the pressures may be assumed to occur in an adiabatic way, e.g., a mathematical model of the system that is based on an adiabatic pressure equalization process may be used to determine the pump chamber volume.

Abstract: A system and method for measuring the airflow in an air handling unit, comprising a pressure plate with a plurality of apertures having a known surface area, a differential pressure manometer, and two. The first end of the leads is attached to a differential pressure manometer and second end of the leads is attached to the pressure plate. The pressure plate is placed in the filter rack of an air conditioning system the differential pressure manometer measures the differential pressure loss across the pressure plate allowing the user to determine airflow conditions and the location of obstructions. Additional embodiments of the system and method herein include placing two sensor tubes having apertures along the thereof at specific locations within the air handling unit that, when attached to a manometer, measure the differential pressure loss across the two locations. Various methods for establishing and monitoring proper airflow in an air handling unit are also contemplated.

Abstract: A static port apparatus for an aircraft having a static plate having inner and outer surfaces for fixture on the aircraft. The static plate including a first set of a plurality of port apertures and at least a second set of a plurality of port apertures. Each port aperture of the second set of port apertures is coaxially positioned with respect to each port aperture of the first set of port apertures.

Abstract: A sampling system includes a collection module including a gas handler, and a flow controller in communication with the gas handler of the collection module. The flow controller controls the gas handler to move a selected volume of gas through the collection module.

Abstract: Certain embodiments of the invention may include systems, methods, and apparatus for determining airflow through a burner. According to an example embodiment of the invention, a method is provided for determining airflow through a burner. The method includes installing a first end of an inlet pressure transmission tube in an air inlet region of a furnace burner system, installing a first end of a burner pressure transmission tube in a burner exit region of the furnace burner system, connecting a second end of the inlet pressure transmission tube to a first pressure sensor, connecting a second end of the burner pressure transmission tube to a second pressure sensor, measuring the differential pressure between the first and second pressure sensors, and determining airflow based at least in part on the measured differential pressure.

Abstract: A beta ratio changer is provided for a flow measurement device having a fluid displacement member. The beta ratio changer includes a flange and a sleeve extending axially from the flange. The sleeve may be inserted into a fluid conduit of the fluid measurement device, reducing the inner diameter of the fluid conduit around the fluid displacement member. A new beta ratio may be determined from the diameter of the edge of the fluid displacement member and the inner diameter of the sleeve.

Abstract: A device for measuring the physical characteristics of a flow within a pipe is disclosed. In one exemplary embodiment, the device comprises a plug attached to two or more strut assemblies, each strut assembly comprising a forward strut, a rearward strut, and a skid having an inner surface that faces the plug, and one or more sensors located on the inner surface of the skid.

Abstract: Apparatus for measurement of airflow in a duct is described. The apparatus combines a Pitot tube, sensing apparatus, control apparatus, a display, control switches and a handle into a unitary structure that is holdable with a single hand while performing obtaining measurement data.

Abstract: The present invention describes a system and method for accurately measuring the concentration of a substance within a filter housing. A concentration sensor and a communications device are coupled so as to be able to measure and transmit the concentration of a particular substance within the filter housing while in use. This system can comprise a single component, integrating both the communication device and the concentration sensor. Alternatively, the system can comprise separate sensor and transmitter components, in communication with one another. In yet another embodiment, a storage element can be added to the system, thereby allowing the device to store a set of concentration values. The use of this device is beneficial to many applications. For example, the ability to read concentration values in situ allows integrity tests to be performed without additional equipment.

Abstract: A flow metering device includes a flow tube, a motor for positioning the flow tube, an outlet nozzle in fluid communication with the flow tube, and an inlet nozzle in fluid communication with the flow tube. The outlet nozzle has an outlet pressure tap and the inlet nozzle has an inlet pressure tap. The inlet nozzle, the flow tube, and the outlet nozzle define a flow path that has a plurality of recirculation zones. At least one of the inlet pressure tap and the outlet pressure tap opens within one of the recirculation zones.

Abstract: The present invention describes a system and method for accurately measuring the concentration of a substance within a filter housing. A concentration sensor and a communications device are coupled so as to be able to measure and transmit the concentration of a particular substance within the filter housing while in use. This system can comprise a single component, integrating both the communication device and the concentration sensor. Alternatively, the system can comprise separate sensor and transmitter components, in communication with one another. In yet another embodiment, a storage element can be added to the system, thereby allowing the device to store a set of concentration values. The use of this device is beneficial to many applications. For example, the ability to read concentration values in situ allows integrity tests to be performed without additional equipment.

Abstract: A pressure gauge for determining at least one pressure value describing a pressure of a fluid flowing in a pulsating manner in a phase of the pulsating flow, includes a pulse wave characterizer. The pulse wave characterizer is configured to obtain transmit time information of a pulse wave, and amplitude information of the pulse wave. The pressure gauge additionally includes a pressure value determiner configured to obtain a first pressure value describing a pressure of the fluid in a first phase, on the basis of the transmit time information and while using a mapping. The pressure value determiner is further configured to obtain a second pressure value describing a pressure of the fluid in a second phase, on the basis of the first pressure value and the amplitude information while using a mapping.

Abstract: A mudline riser annulus flow meter includes a liner configured to be attached to a riser to cover a hole; a cover configured to be attached to the riser to cover the liner such that a cavity is formed by the liner and the cover; a sensor rod configured to be attached to the liner and to extend inside cavity, the sensor rod having a bore; a magnet assembly configured to be fixedly attached to the sensor rod; and a waveguide tube attached to the cover. The bore of the sensor rode is configured to receive the waveguide tube.

Abstract: A flowmeter for detecting at least one property of a fluid medium flowing through a flow tube, in particular a flow property, is described. The flowmeter has at least one ultrasonic sensor for detecting at least one first flow property of the fluid medium. In addition, the flowmeter has at least one differential pressure sensor for detecting at least one second flow property of the fluid medium.

Abstract: A flowmeter device for measuring a flow rate of a fluid includes a conduit for the fluid flow. The conduit is characterized by a cross-sectional area and includes at least one section within which the cross-sectional area is different from the cross-sectional area of at least one other section of the conduit. The device also includes a reference tube separated from the conduit by a wall and at least one opening in the wall between the section and the reference tube. The device includes a flexible diaphragm forming a space between the diaphragm and a region of the wall at the section of the conduit, and which includes the opening, to inhibit flow of the fluid between the conduit and the reference tube.

Abstract: Multiple flow sensors in an array are provided to achieve wide dynamic range, low detection limit, and potentially low cost. Each flow sensor can measure the flow rate of surrounding fluid, among other fluid parameters. The flow sensor can be rendered active by inclusion of a piezoelectric element so as to be capable of achieving mechanical vibration, hence allowing it to interact with local fluid surroundings, or capable of converting mechanical energy in the surrounding fluid to electrical signals and energy.

Abstract: For testing metered-dose-ejection devices, whether the ejected dose accords with a rated dose, the device (1) is sealingly applied (26) to a test compartment (24) and upon machine manipulation on the device (M, 5) a dose is ejected into the test compartment (24). Pressure difference established by such injection and with respect to a pre-established reference pressure (30) in the test compartment (24) is monitored by a pressure sensor (32). The output signal (o) of this sensor (32) is indicative of the extent of the addressed dose.

Abstract: A continuous atmospheric horizontal dustfall flux measurement apparatus includes: a dust sampling port that includes a ceiling plate, a side wall, and four or more partition plates; a suction pipe; a continuous dust amount measurement device that continuously measures a dust amount per unit time; a blower or a compressor; an exhaust port, wherein the side wall is a plate that has a vertical center axis and has a side surface with a substantially circular or polygonal truncated cone shape widened upward, and wherein the side wall includes a suction port which is formed at the lower end thereof so as to be connected to the suction pipe and an external air inlet which has four or more openings disposed at the same interval in the circumferential direction of the side wall at a constant height near the upper end thereof.

Abstract: Techniques are provided for monitoring particle laden flows in a pipe, that include receiving signalling containing information about a parameter related to a particle laden flow in a pipe, the parameter including either (a) a sound level propagating through the particle laden flow in the pipe, or (b) a static pressure due to an acceleration of the particle laden flow in the pipe; and determining a measurement of a particle size and either a mass flow rate, or a particle-to-air mass ratio, or both the mass flow rate and the particle-to-air mass ratio, associated with the particle laden flow, based at least partly on a change in the parameter.

Abstract: A method and apparatus are disclosed for determining a flow rate in a topical negative pressure (TNP) system. The method includes the steps of determining a pumping speed associated with a pump element of a TNP system, determining a pressure associated with a flow path associated with the pump element, and determining flow rate in the flow path responsive to the pumping speed and flow rate.

Abstract: The present invention describes a system for accurately measuring the concentration of a substance within a filter housing. A concentration sensor and a communications device are coupled so as to measure and transmit the concentration of a particular substance within the filter housing while in use. This system allows the operator to certify the integrity of the filters within the filter housing at the customer site without additional equipment. In one embodiment, a tracer gas, such as helium or hydrogen, is added to a carrier and injected into the system. The concentration of tracer gas at a specific operating transmembrane pressure is indicative of bubble pointing specific pores in the filter. This test will give a more sensitive indication of the bubble point and the presence of defects than a standard diffusion test. In a second embodiment, two gasses, in a known ratio, are introduced into the filter housing.

Abstract: A device for adjusting a temperature and a humidity using a wind power is provided. The device includes an inlet; an outlet connected to the inlet; a sprayer spraying a nebulized liquid into the device; and an airflow sensor electrically connected to the sprayer for activating the sprayer when an airflow passes through.

Abstract: A multi-vortex flowmeter includes a vortex type detection device including a measurement tube provided in a flow channel to allow a fluid to be measured to pass, a vortex generator provided in the measurement tube to face a flow of the fluid to be measured, and a vortex detector for detecting a change based on a Karman vortex generated by the vortex generator. The flowmeter also includes a thermal type detection device including a temperature sensor and a heating temperature sensor, each protruding into the flow channel, and a flow rate converter, in which a pressure gauge for measuring a pressure in a pipe wired together with the vortex detector and the thermal detection device is provided integrally with the flow rate converter.

Abstract: A flow rate measuring method for a multiphase fluid mixture flowing into a line is provided. The method comprises the steps of passing the fluid mixture through a Venturi tube having a pressure drop, measuring a differential pressure across the Venturi tube and a line pressure of the fluid mixture, measuring by a second measuring device, measured parameter(s) of the fluid mixture correlated to first and second phase relative quantities, determining estimated parameter(s) of the fluid mixture correlated to the first and second phase relative quantities based on the measured parameter and an extrapolating scheme, determining phase flow rate(s) based on the differential pressure, the line pressure and the measured parameter(s) of the fluid mixture, and determining flow rate(s) based on the differential pressure, the line pressure of the fluid mixture and the estimated parameter(s) of the fluid mixture.

Abstract: The static pressure, the differential pressure, and the temperature must be known in order to be able to determine the mass flow rate, the volumetric flow under standard conditions, or the enthalpy flow of a fluid. Desired variables are detected by individual sensors located in an integrated sensor unit, and the values detected by the individual sensors are then processed in a computing unit that is also integrated in the sensor unit. The sensor unit outputs a value, which also takes other parameters and/or physical constants into account, to a control unit that is connected downstream. Some of the computing is advantageously done in the sensor unit so that some load is relieved from the control unit.

Abstract: Disclosed is an air flow rate sensor capable of sensing an air flow rate and respirator air flow rate. The air flow rate sensor includes a chamber having left and right portions having same internal diameters and a central portion having an internal diameter greater than the internal diameters of the left and right portions, first and second pressure taps provided at the left and right portions of the chamber, respectively, and a pressure sensor connected to the first and second pressure taps to measure a differential pressure between the left and right portions of the chamber. There are obstacles on the path of air flow, so that exact and uniform measurement characteristics are maintained. Since energy loss is measured by using vortex, the structure of the air flow rate sensor is simplified. The air flow rate sensor is used as a respirator air flow rate sensor.

Abstract: An assembly including conduit for conveying a flowable substance having a gas phase and a liquid phase, and a cone-shaped displacement member including an upstream end and a downstream end. A first flow measurement tap communicates with an area at the upstream end, a second flow measurement tap communicates with an area at the downstream end and a third flow measurement tap communicates with an area downstream of the displacement member. A device determines a first differential pressure value based on a flow measurement taken from any two of the first, second and third flow measurement taps and a second differential pressure value based on a flow measurement taken at one different tap.

Abstract: A measuring device (100) and system for measuring physical properties of individual phases in a multiphase flow flowing through a pipe (110), wherein the measuring device (100) comprises a measuring section (120) with at least two separate and elongate chambers (130) that are formed by at least one longitudinal baffler (140), at least one of the chambers (130) comprising means for measuring the physical properties of the multiphase flow that flows through the chambers (130), and wherein the internal diameter of the pipe (110) is smaller at the location where the measuring section (120) is positioned, in that there is a constriction (220) in the inner pipe wall of the pipe (110).

Abstract: An improved system and method for monitoring contamination loading of a filter in a biological safety cabinet comprising a housing defining a work chamber and a filtration chamber, a system for circulating air between the work chamber and the filtration chamber via a fan which draws air under negative pressure from the work chamber and delivers the air under positive pressure through the filter and into the filtration chamber. The filter monitoring system determines a pressure differential between the negative and positive air pressure at opposite sides of the fan, and evaluates the degree of contamination loading of the filter on the basis of the pressure differential. An air flow baffle is disposed within the filtration chamber adjacent the fan for dividing the pressurized air delivered by the fan and partially redirecting a portion thereof for more uniformly delivering the air to the filter.

Abstract: A duct-mountable sensing unit includes a plurality of sensors for detecting respective parameters, including pressure, of a fluid in a duct. The sensing unit enables fluid communication between the sensors and the fluid in the duct through a single insertion point in the duct.

Abstract: In a pressure sensor that detects the pressure of liquid flowing in a main fluid flow path, a pressure measuring unit is installed by providing a pressure measuring space at a position branching from a straight-pipe portion of the main fluid flow path, and, in addition, the main fluid flow path and the pressure measuring space are connected with an inlet pipe and an outlet pipe whose pipe diameters are smaller than the main fluid flow path.

Abstract: There is provided a substrate processing method of supplying a processing solution to a substrate through a supply nozzle connected with a supply path via a differential pressure flowmeter provided on the supply path for supplying the processing solution and performing a process on the substrate by the processing solution. The substrate processing method includes measuring a pressure value in the supply path by a pressure measurement unit included in the differential pressure flowmeter when the processing solution is not supplied to the substrate; determining whether the pressure measurement unit is operated normally by comparing the pressure value measured in the measuring process with a predetermined pressure value; and supplying the processing solution to a substrate if it is determined that the pressure measurement unit is operated normally in the determining process.

Abstract: An arrangement for measuring air flow includes a source of measurement values and a processing unit. The source of measurement values is operable to generate measurement values representative of a difference in pressure from air obtained on a first side of an obstruction and air obtained on a second side of the obstruction. The processing unit is configured to, in one case, convert any negative measurement values of the measurement values to a less negative value. The processing unit is further configured to perform low pass filtering on the measurement values and convert the filtered measurement values to a flow value.

Abstract: An erosion-resistant insert is provided for a flow measurement device having a fluid displacement member. The insert includes a flange and a sleeve extending axially from the flange. The sleeve may be inserted into a recess machined into a fluid conduit of the fluid measurement device to protect the inner wall of the conduit. The insert maintains the inner diameter of the conduit and the beta ratio of the flow measurement device.

Abstract: A firefighting monitor includes logic circuitry for determining the reaction force caused by the flow of firefighting fluid therethrough. The reaction force may be communicated to structures remote from the monitor for taking appropriate actions in response to the reaction forces exceeding one or more criteria. The monitor may also use flow and nozzle data for calculating a reach of the stream of the fluid, and may transmit this reach data to a remote location. The monitor may also utilize multiple pressure sensor transducers positioned inside the monitor for determining the rate of fluid flow, rather than a paddle wheel-type sensor.

Abstract: A differential pressure transmitting device detects, through two pressure guiding tubes, a differential pressure that is generated when that which is to be measured, such as a liquid, a slurry, or a gas, that has fluctuation in the pressure thereof, passes through a differential pressure generating mechanism. A pressure guiding tube blockage diagnosing device comprises: a rising/falling frequency detecting portion for segmenting the differential pressure values detected by the differential pressure transmitting device into a plurality of intervals, and for detecting, for each interval, the rising/falling frequency of the fluctuation of the differential pressure; and an evaluating portion for comparing the rising/falling frequency of the fluctuation to a specific threshold value to evaluate the state of blockage of the pressure guiding tubes.