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8051708 |
Temperature measuring circuit in a flowmeter
A value of a line-to-line resistor (24) is determined by subtracting a resistance value determined as a product of a voltage ratio based on divided voltages and a value of a reference resistor in a...
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8037751 |
Flow rate measuring apparatus
The flow rate measuring apparatus includes a connector portion, a main body portion, a bypass passage, a flow rate sensing element having a flow rate detection portion, a control circuit, a pair of...
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8015726 |
Automatic clothes dryer
An automatic clothes dryer comprises a cabinet defining an interior space in which is rotatably mounted a drum that defines a drying chamber, a heater assembly having a heating element for heating...
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7954373 |
Thermal type flow meter
There is provided a thermal type flow meter capable of accurately detecting a flow rate even when a fluid temperature varies rapidly or when the fluid temperature is high. A probe includes: a first...
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7895888 |
Thermal mass flow meter including heating element and temperature sensors formed on separate chips and secured to the outer periphery of the pipe
A heater chip (4) as a heat generation element is secured to the surface on the periphery of piping (2). Further, a temperature sensor chip couple (6) is placed on the surface on the periphery of...
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7814785 |
Thermal flow meter, thermal flow meter control method, and sensor element of thermal flow meter
A thermal flow meter corrects flow rate detection errors produced by vaporization of liquid phase components included in a gas to be measured. The thermal flow meter includes a correction circuit...
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7726187 |
Thermal type flow meter and engine control system using the same
A thermal type flow meter has a first heating resistor, a second heating resistor for blocking heat transfer from the first heating resistor to a console, a temperature measuring resistor...
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7617724 |
Thermal mass flow meter having a heater and paired temperature sensor chips separately formed and mounted on the flow pipe
A piping is anchored onto the lower faces of a heater chip and temperature sensor chips by using a thermal conductive adhesive. The heater chip and the temperature sensor chips are coated with a...
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7591177 |
Flow sensor and mass flow controller using the same
A low cost, compact, high performance flow sensor that can be made small in size even for use in a large flow rate and a mass flow controller using the same are provided. The flow sensor includes a...
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7587938 |
Thermal type flow meter including a secondary heating device to suppress heat transfer
A thermal gas-flow measuring instrument has a first heating resistor placed in the gas to be measured. A temperature sensing resistor is positioned upstream or downstream of the first heating...
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7565836 |
Thermal type flow sensor having a second control circuit to control a second heating resistor above the first heating temperature
A flow rate measuring element of a thermal type flow sensor is placed in the fluid to be measured. The element includes: a first heating resistor for measuring a flow rate; a second heating...
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7555945 |
Mass air flow sensor having off axis converging and diverging nozzles
A mass air flow sensor for an internal combustion engine is provided. The sensor has a pair of opposed nozzles. A converging nozzle has a first conical throughbore having a first throughbore axis,...
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7552633 |
Thermal type gas flowmeter
A thermal type gas flowmeter comprising a sensor element which, in turn, comprises at least one first heating resistor, two or more resistors in fluid and a second heating resistor which is...
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7528737 |
Temperature responsive indicators for process control instruments
A process transmitter includes a temperature responsive indicator to indicate an operating condition of the process transmitter. The operating condition may represent a level of a sensed process...
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7478556 |
Apparatus for the rapid measurement of temperatures in a hot gas flow
An apparatus for a rapid measurement of temperatures in a hot gas flow, in particular in a gas turbine. The apparatus includes a sensor having two two-dimensional, electrically conductive heating...
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7444863 |
Thermal mass flowmeter
Disclosed is a thermal mass flowmeter, which comprises a heating unit disposed on an outer peripheral surface of a capillary tube, and a pair of temperature-sensing units each provided as a...
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7418859 |
Device for measuring a volume flow with inductive coupling
A device for measuring a volume flow, especially a tidal volume flow sensor, with a flow channel (1) and with a sensor element (6) arranged within the flow channel (1), is shown and described. The...
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7415935 |
System for determining the air flow conditions around one or more sails
The invention relates to a system adapted for sailors in order to determine the air flow conditions around one or more sails, in conjunction with which both sides of the sails are equipped with a...
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7249503 |
Tube and die interface for liquid flow sensing through the tube
A thermal sensor includes a die having a surface formed to accept the outer surface of tubing; a molded plastic part located on the die surface, said molded plastic part including flexible portions...
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RE39466 |
Flow rate sensor implementing a plurality of inner tubes located within a sensor tube
There is provided a flow rate sensor comprising: a pair of heating resistors operable to heat a sensor tube; a temperature sensor operable to control respective temperatures of the heating...
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7121139 |
Thermal mass flow rate sensor having fixed bypass ratio
A flow rate sensor includes a main conduit, a sensor tube and a bypass tube connecting an upstream portion of the main conduit to a downstream portion of the main conduit such that flow through the...
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7028544 |
Mass flowmeter for measuring by the CT method
A mass flowmeter of the thermal type provided with a flow sensor with a flow tube through which a fluid can flow during operation, with a temperature sensor in an upstream position (A) and a heater...
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7016790 |
In-line hot-wire sensor for slurry monitoring
An in-line hot-wire sensor for monitoring the mixing and the flow rate of slurry is disclosed. The hot-wire sensor may include a number of resistors organized into a Wheatstone bridge, as well as a...
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7000464 |
Measuring and control of low fluid flow rates with heated conduit walls
The flow of a fluid at low flow rates is measured in a flow sensing assembly and controlled without introducing measuring devices into the fluid flow path. The flow sensing assembly is enclosed in...
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7000465 |
Attitude error self-correction for thermal sensors of mass flow meters and controllers
A system for and method of compensating for attitude sensitivity of at least two thermal sensor coils mounted on a tube through which a fluid flows along a common axis of flow for use in generating...
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6988400 |
Mass flowmeter having measuring ranges measured by two separate methods
A flowmeter of the thermal type with a single flow sensor is connected to control and temperature measuring elements for measuring in a first measuring range by a first measuring method and in a...
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6923054 |
Microscale out-of-plane anemometer
A microscale out-of-plane thermal sensor. A resistive heater is suspended over a substrate by supports raised with respect to the substrate to provide a clearance underneath the resistive heater...
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6901795 |
Oscillating hot wire of hot film flow sensor
This invention is a flow measurement device that has high spatial (less than 1.0×1.0 mm2) and temporal resolution (greater than 10 s to 100 s kHz) to measure flow properties in unsteady and ...
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6874362 |
Mass air flow sensor with stress free sensor element mounting
An air flow sensing apparatus with a plastic housing having at least two leadframes that are embedded in the plastic housing and adapted for the attachment of a sensing element whose major axis is...
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6843123 |
Flow rate sensor, flow rate measuring device, and flow rate control device
A flow rate sensor capable of increasing a range where fluid flow rate can be detected with a high accuracy. The flow rate sensor includes: a sensor pipe; a resistor group; a reference resistor...
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6840116 |
Kelvin sensed hot-wire anemometer
A Kelvin sensed hot-wire anemometer includes four electrically conductive pins and a filament welded to all four pins, preferably using a single filament. A current source is coupled to the two...
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6813945 |
Resistive wire mass flow meters
A flow meter which includes a resistive wire placed in the path of a fluid whereof the flow rate is to be measured. A processing unit for applying current pulses to the wire and for determining the...
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6779396 |
Method for measuring flow within an open tube
A change in physical properties of a fluid within an open tube which is caused by heating an arbitrary portion in the open tube by heating means is detected by using a detector disposed with a...
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6736005 |
High accuracy measuring and control of low fluid flow rates
The flow of a fluid at low flow rates is measured and controlled without introducing measuring devices into the fluid flow path. As the fluid is flowing through tubing, the tubing is heated to...
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6729187 |
Self-compensated ceramic strain gage for use at high temperatures
A self-compensated strain gage sensor having a temperature co-efficient of resistance (TCR) of essentially zero comprised of a wide band semiconductor and a compensating metal functioning as serial...
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6688170 |
Sensor for measuring flow velocity in gases and method for the production thereof
A sensor for measuring the flow velocity of gases. The sensor includes a printed circuit board (1) having an opening (2) formed therein. A pair of first contact elements are disposed on opposing...
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6681625 |
Constant-temperature-difference bidirectional flow sensor
A bidirectional flow sensor (800) for automated systems includes a heater (18) which is maintained at a constant temperature above the temperature of the fluid flowing past the heater. A pair of...
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6670582 |
Micro-thermocouple for a mass flow meter
Construction of a micro-thermocouple sensor designed to be incorporated in a mass flow meter for the circulation of gaseous fluids, includes of the following steps: depositing an insulating layer...
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6637264 |
Mass flowmeter
Mass flowmeter comprising a hollow conduit of a heat-conducting material for transporting in a determined flow direction a fluid with a mass flow rate to be measured, a first temperature-sensitive...
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6595049 |
Thermal mass flow sensor with improved sensitivity and response time
A thermal mass flow sensor having superior sensitivity and response time includes a flow sensor tube defining an interior channel for fluid flow between input and output ends, a heating element in...
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6568261 |
Hot wire gas flow sensor
An improved hot wire gas flow sensor is disclosed having a housing with a passageway in series with a passageway through which the gas flow is measured. The housing includes both a hot wire and...
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6564629 |
Thermal flowmeter
A device for measuring the flow of a fluid located in a fluid channel heats the fluid channel without additional components. A metallic tube (2) with predetermined thermoelectric potential is...
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6446504 |
Constant temperature gradient differential thermal mass flow sensor
A thermal mass flow sensor in which heat transfer to and from a fluid flowing through a sensor conduit is optimized by establishing a symmetrical triangular temperature distribution along a heated...
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6354150 |
Sensor for a capillary tube of a mass flow meter
The sensor (7) for a mass flow meter (1) including a capillary tube (6) for circulation of fluid in parallel with the principal circuit of the fluid circulation. The sensor includes heating...
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6269692 |
Mass flow measuring assembly having low pressure drop and fast response time
An assembly for measuring the mass flow and flow rate of gases such as are used in semiconductor fabrication processes. The assembly includes an axial flow passage, viz., a capillary tube with a...
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6208254 |
Thermal dispersion mass flow rate and liquid level switch/transmitter
A thermal dispersion switch/transmitter for determining flow rate and liquid level in a non-contacting apparatus. A special preparation of one or more small spots in the outside surface of the wall...
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6125695 |
Method and apparatus for measuring a fluid
A flow sensor including a symmetrical sensor tube for carrying the fluid, first and second heaters symmetrically disposed at the sensor tube, and a first temperature sensor in thermal communication...
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6119529 |
Fluid flow meter and corresponding flow measuring methods
A fluid flow meter is of the type including a heated probe sensor of known electric resistance dipped into or swept by a fluid stream having a predetermined velocity. The sensor is capable of...
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6085588 |
Flow rate sensor
A flow rate sensor includes a substantially cylindrical sensor body having an inlet end and an outlet end, and a flow channel formed between the two ends of the sensor through which a liquid can...
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6062077 |
Techniques for making and using a sensing assembly for a mass flow controller
The present invention provides a technique for making a sensing assembly for use in a mass flow controller. The technique includes providing separating terminals between windings on a sensor tube....
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