845results about "Volume flow proportion measurement" patented technology

A measuring device for measuring the mass of a medium flowing in a flow line, in particular the aspirated air mass of an internal combustion engine, including a measuring element bathed by the flowing medium and disposed in a flow conduit of the measuring device provided in the flow line. The flow conduit extends in a primary flow direction between an inlet opening that communicates with the flow line and at least one outlet opening that discharges into the flow line downstream of the inlet opening. The flow conduit branches at a first dividing point, disposed between the inlet opening and the measuring element, into a measuring conduit, in which the measuring element is disposed, and a first bypass conduit, which bypasses the measuring element in the primary flow direction.

A method for calibrating a mass flow controller comprising a calibrating valve disposed on the most upstream side of a path, a mass flow rate control valve mechanism, a tank provided at the path on the upstream side of the mass flow rate control valve mechanism, a mass-flow-rate-sensing means, a pressure-sensing means, a means for controlling the mass flow rate control valve mechanism, and a mass flow rate calibration control means, the method comprising the steps of (1) permitting a fluid at a set mass flow rate to flow through the path, (2) setting the mass flow rate control valve mechanism at a degree of opening that the mass flow rate of the fluid is equal to the set mass flow rate, (3) closing the calibrating valve, (4) measuring the pressure and mass flow rate of the fluid after a fluid flow from the tank is stabilized, (5) determining a variation ratio of the pressure and mass flow rate to reference pressure and mass flow rate measured by the same procedures in an initial state, is and (6) performing calibration depending on the variation ratio.

A packing method and system for measuring multiple measurands including bi-directional flow comprises of sampling ports arranged within a flow tube in a symmetrical pattern. The ports are arranged symmetrically with respect to the X and Y centerlines of the flow tube. In addition, the ports are also arranged symmetrical to the restrictor to minimize the amount of turbulent flow within the flow tube.

Monitoring method and system are provided for dynamically determining rack airflow rate and rack power consumption employing a heat exchanger disposed at an air outlet side of the electronics rack. The method includes: sensing air temperature at the air outlet side of the electronics rack, sensing coolant temperature at a coolant inlet and coolant temperature at a coolant outlet of the heat exchanger, and determining airflow rate through the electronics rack; and outputting the determined airflow rate through the electronics rack. The determining employs the sensed air temperature at the air outlet side of the rack and the sensed coolant temperatures at the coolant inlet and outlet of the heat exchanger. In one embodiment, the heat exchanger is an air-to-air heat exchanger, and in another embodiment, the heat exchanger is an air-to-liquid heat exchanger.

A post in a fluid passage for passing a fluid flow extends across a part of the fluid flow; a measuring duct in the post extends through the post; and a flow rate detector is located in the measuring duct. The measuring duct has a fluid introduction port with an elongated shape, the measuring duct is constricted and has at least a portion located between the fluid introduction port and the flow rate detector, substantially smoothly narrowing toward a downstream direction of the flow in a longitudinal direction of the elongated shape.

A mass flow controller includes a mass flow sensor and a calibrator configured to perform a self-calibration on the mass flow controller. The calibrator generates flow measurements that are used as “standards” and flow measurements from the mass flow sensor are correlated to flow measurements from the calibrator.

An air flow measuring device includes a housing, flow sensor, and a humidity sensor. The housing defines a bypass flow passage through which intake it passes. A part of intake air is taken into the bypass flow passage to pass through the bypass flow passage. The flow sensor includes a sensing part disposed in the bypass flow passage, and produces a signal which is in accordance with the flow rate of intake air as a result of heat transfer between intake air taken into the bypass flow passage and the sensing part. The humidity sensor includes a sensing part exposed to the intake passage, and projects from an outer wall of the housing into the intake passage. The humidity sensor produces a signal which is in accordance with humidity of intake ail flowing through the intake passage.

A mass flow sensor calibrator employs a variable-flow fluid source, a receptacle of known volume, and a pressure differentiator. The variable-flow fluid source supplies gas at varying rates to the mass flow sensor being calibrated and at proportional rates to a receptacle of known volume. A pressure differentiator computes the time derivative of gas flow into the receptacle of known volume and, from that, the actual flow into the receptacle. Given the actual flow, the proportionate flow into the mass flow sensor may be determined and the flow signal from the mass flow sensor correlated to the actual flow.

An environmental monitoring and controlling system for a ventilated cage and rack system that monitors and measures air flow in the rack at either the rack or cage level. At the rack level, two pressure sensors are provided in a supply air system to accurately monitor the air flow rate into the rack. In addition, two pressure sensors may be provided in an exhaust air system to accurately monitor the air flow rate out of the rack. At the cage level, a cage may be equipped with a highly accurate pressure sensor, including a Venturi tube and thermistor, the monitor the air flow rate in a cage located at any cage position in the rack.

An ultrasonic measuring unit and a method for detecting ultrasonic signal run-times, in which the ultrasonic measuring unit has two ultrasonic transducers for coupling ultrasonic signals into a flowing medium. Analysis electronics are provided to be accommodated on or in a flow tube, in which a gaseous medium such as circulating air flows. A probe unit is accommodated in the flow tube, the probe unit being assigned a temperature probe having a flow around it, whose measured value is used for correcting a temperature signal detected by ultrasound.

An environmental monitoring and controlling system for a ventilated cage and rack system that monitors and measures air flow in the rack at either the rack or cage level. At the rack level, two pressure sensors are provided in a supply air system to accurately monitor the air flow rate into the rack. In addition, two pressure sensors may be provided in an exhaust air system to accurately monitor the air flow rate out of the rack. At the cage level, a cage may be equipped with a highly accurate pressure sensor, including a Venturi tube and thermistor, the monitor the air flow rate in a cage located at any cage position in the rack.

An arrangement of a mass intake air flow measurement device suitable for integrating a humidity sensing device as well as a temperature sensing device and a pressure sensing device is provided. A second bypass passage 501 bypassing a bypass passage 205 is formed and a humidity sensing device 500 is mounted in the second bypass passage 501. A second bypass passage inlet 502 and a second bypass passage outlet 503 formed in a wall surface of the bypass passage 205 are opened parallel to the direction of flow of air flowing in the bypass passage 205.

An apparatus for determining a characteristic of a fluid flow within a pipe is provided, wherein the apparatus includes a separating device for separating the fluid into a gas component and a liquid component and directing the gas component to flow within a gas leg portion of the pipe and the liquid component to flow within a liquid portion of the pipe. The apparatus includes a gas leg portion metering device for generating gas component data and a liquid leg portion metering device for generating liquid component data. Moreover, the apparatus includes a processing device communicated with at least one of the gas leg portion metering device and the liquid leg portion metering device, the processing device being configured to receive and process at least one of the gas component data and the liquid component data to generate fluid flow data responsive to a fluid flow characteristic.

A mass flow controller includes an electronic controller for which a plurality of closed loop control codes sets may be uploaded. In a dual processor embodiment, one processor may upload a plurality of codes sets for another, with the selection of codes sets determined by the uploading processor either autonomously or through user interaction.

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.

A mass flow controller includes an electronic controller that provides a web server that allows access to the web server through such interworking networks as the Internet.

A flow sensor is provided having a substrate with a sensing element and flow channel aligned over the sensing element. The sensing element senses at least one property of a fluid. The flow channel is aligned by one or more guide elements formed in an alignment layer. The flow channel across the sensing area is accurately and precisely aligned due to the guide elements provided at the wafer-level, facilitating reliable, low-cost, and consistent results among multiple flow sensors. The flow sensor is adapted for use in harsh environments.

A sensing apparatus for use in a mass flow rate sensor for measuring a fluid flow rate includes a main conduit for containing a fluid flow, and a sensor passageway for tapping a portion of the fluid flow from the main conduit at a first location, and returning the portion of the fluid flow to the conduit at a second location. At least one bypass passageway, which may be provided in the form of a tube, is positioned in the main conduit between the first and second locations, and the bypass passageway is provided with non-negligible entrance effects that are substantially equal to entrance effects of the sensor passageway, so that a bypass ratio of the apparatus remains constant. A mass flow rate sensor of the present disclosure accurately measures any type of gas but only requires calibration in only one reference gas.

A system includes a custody transfer system configured to transfer a gas fuel from a gas supply to a plurality of gas turbines. The custody transfer system includes a first plurality of flow meters arranged in parallel with each other, wherein each of the first plurality of flow meters is configured to obtain a first measurement of a portion of a flow rate of the gas fuel flowing through the custody transfer system, and a second plurality of flow meters in series with the first plurality of flow meters, wherein each of the second plurality of flow meters is configured to obtain a second measurement of the flow rate of the gas fuel flowing through the custody transfer system, and wherein each of the first and second plurality of flow meters is configured to be blocked or unblocked from receiving the gas fuel based on a number of the plurality of gas turbines in operation.

Apparatus and methods for employing electrical properties of water to indicate the level of filtered water in a filtered water container. The container is fitted with a hopper that holds unfiltered water. The hopper is fitted at its base with a removable and replaceable filter cartridge. Water is filtered by draining through the filter medium contained in the filter cartridge into the lower portion of the container. The water level in the filtered water container is monitored by means of one or more water level detector strips in the hopper or in the lower portion of the filtered water container. The detector strips are in electrical communication with a detection circuit and a control unit. The control unit uses the detection strips to monitor water level and uses such data to track filtered water consumption and to determine when the filter cartridge should be replaced.

A sensor device for detecting at least one flow property of a fluid medium. The sensor device includes at least one sensor housing, in which at least one electronic module having at least one flow sensor for detecting the flow property is accommodated. The electronic module is at least partially accommodated in at least one electronic space. Furthermore, at least one pressure sensor and at least one humidity sensor are accommodated inside the sensor housing. The pressure sensor and also the humidity sensor are at least partially accommodated in at least one sensor space, which is designed separately from the electronic space.

The measurement of volume flows or mass flows in the intake system of motor vehicle internal combustion engines plays a significant role in reducing pollutant emissions. Therefore, an ultrasonic flow meter for measuring a flow rate of a fluid flowing in a primary flow direction is described. The ultrasonic flow meter has at least two ultrasonic transducers, the ultrasonic transducers being capable of emitting and / or receiving ultrasonic waves at an angle α to the primary flow direction which is different from 90°. Furthermore, the ultrasonic flow meter has at least one guide element which is entirely or partially situated in the fluid. This guide element diverts at least one part of the flowing fluid in such a way that in the diversion, a velocity component is transferred to at least one part of the flowing fluid perpendicular to the primary flow direction. Guide vanes or displacers in particular are described as guide elements. In addition, turbulators may be provided on the guide elements, the turbulators generating a longitudinal fluid bed along the guide elements and thus causing the flow of the fluid to have a better contact with the guide elements when flowing around them. This reduces turbulences within the ultrasonic flow meter. Compared to the devices known from the related art, the ultrasonic flow meters described are distinguished by an improved signal-to-noise ratio and accordingly by a higher measuring precision.

A laminar flow element for use in thermal mass flow sensors and flow controllers is designed to provide a high degree of precision. The precision laminar flow element includes a laminar flow element having a generally pointed entry end for maintaining a pure laminar flow path around the laminar flow element. The generally pointed entry end serves to direct an incoming gas flow stream equally about an outer surface of the laminar flow element. In this way, the laminar flow path is uniform so as to maintain a desired flow accuracy. The laminar flow element provides a plurality of standoff pins protruding from the outer surface of the laminar flow element to maintain a substantially equal radial clearance around the outer surface. By maintaining a substantially equal radial clearance from one laminar flow element to another, the laminar flow element is highly interchangeable. The laminar flow element may also provide a plurality of slots formed in the laminar flow element to accept a relatively high incoming gas flow stream. The precision laminar flow element preserves a linear flow ratio for low and high flow rates. The laminar flow element may be incorporated into a thermal mass flow sensor or flow controller such that the laminar flow element is substantially concentric with a borehole of a flow block. Various laminar flow elements with different annular clearances may be inserted in the same borehole of the flow block to provide a variety of flow rate ranges.

The present invention utilizes self-heating of electronic components to improve a humidity sensing part with low environment resistance, such as a condensation problem and the like, and also to enhance the heat radiation efficiency of electronic components. The humidity sensing part is used in an intake tube of an automobile by integrating, for example, with a heating resister type mass air flow measurement device. A humidity sensing element is mounted on an electronic circuit board in a mass air flow measurement device with the temperature thereof starting to increase immediately after a sensor has been actuated. This urges the temperature of the humidity sensing element to start increasing (being heated) immediately after the sensor has been actuated. To urge the humidity sensing element to be further heated, a base plate is composed of two types of materials, resin and metal. A part of the base plate holding an area of the electronic circuit board generating a large quantity of heat is composed of the metal. A part of the base plate corresponding to the periphery of the humidity sensing part which is to be heated is composed of the resin.

A sensor structure capable of achieving both resistance to pollution and measurement performance such as humidity responsiveness is disclosed as is a multifunction sensor capable of facilitating integration of detecting devices for various physical quantities. The sensor structure includes a housing including a connector that mediates an input / output exchange with an outside and a terminal of the connector; and an electronic circuit board that is mounted inside of the housing and includes a humidity sensing element, the terminal of the connector and the electronic circuit board being electrically connected to each other, the sensor structure being inserted to be attached to an airflow tube through which a main air flows, via a seal material provided in the housing. The housing includes a plurality of bypass channels that each communicate an inside of the housing with an inside of the airflow tube.

A method of sampling a multi-phase fluid stream is provided which comprises the steps of: sampling, with a sampling probe, a portion of the fluid stream; measuring the flow rate of said sampled portion; and measuring, independently of the sampling step, the total flow rate of the fluid stream, wherein the flow rate of the sampled portion is controlled according to the ratio of the flow rate of the sampled portion to the flow rate of the fluid stream, in order to obtain substantially isokinetic sampling of the fluid stream. The method may provide isokinetic sampling to an accuracy of 5% or less and preferably only samples a small portion of the fluid stream. The method has particular application for high rate condensate gas wells. A corresponding sampling system is provided which has particular application in the sampling of streams from well-heads. A flow conditioner for use with sampling methods and systems is also provided, the flow conditioner being a pipe section including: a swirl inducing section; a flow straightener; and an orifice plate.

A pressure type flow control device enabling a reduction in size and an installation cost by accurately controlling the flow of a fluid in a wide flow range. Specifically, the flow of the fluid flowing in an orifice (8) is calculated as Qc=KP1 (K is a proportionality factor) or Qc=KP2m(P1−P2)n (K is a proportionality factor and m and n are constants) by using a pressure P1 on the upstream side of the orifice and a pressure P2 on the downstream side of the orifice. A fluid passage between the downstream side of the control valve of the flow control device and a fluid feed pipe is formed of at least two or more fluid passages positioned parallel with each other. Orifices with different fluid flow characteristics are interposed in the fluid passages positioned parallel with each other. For the control of the fluid in a small flow area, the fluid in the small flow area is allowed to flow to one orifice. For the control of the flow in the large flow area, the fluid in the large flow area is allowed to flow to the other orifice by switching the fluid passages.

A flow sensor is provided having a substrate with a sensing element and flow channel aligned over the sensing element. The sensing element senses at least one property of a fluid. The flow channel is aligned by one or more guide elements formed in an alignment layer. The flow channel across the sensing area is accurately and precisely aligned due to the guide elements provided at the wafer-level, facilitating reliable, low-cost, and consistent results among multiple flow sensors. The flow sensor is adapted for use in harsh environments.