Class 73/204.16 - By control of a separate heating or cooling element

Subclass of Class 73 - Measuring and testing
Definition: Subject matter in which a portion of the measuring circuit
No. of patents: 75
Last issue date: 05/01/2007

«First «Previous1 2 Next»Last»

Number	Title	Issue Date
7212016	Apparatus and methods for measuring resistance of conductive layers Apparatus and methods for measuring the electrical resistance of conductive materials are disclosed. In one embodiment, an apparatus includes a housing, and first, second, third, and fourth conductive members projecting outwardly from the housing. The conductive mem...	05/01/2007
7210194	Airflow sensor system for monitoring air inlet airflow and air outlet airflow of a vacuum cleaner An airflow sensor system for monitoring air inlet airflow and air outlet airflow of a vacuum cleaner is provided according to an embodiment of the invention. The airflow sensor system includes a vacuum cleaner air duct, a bypass tube connected to the air duct, and a...	05/01/2007
7191645	Dynamic mixed gas flowmeter A compensated flowmeter having a probe adapted to project into flowing media within a conduit. The probe includes a thermal dispersion sensor, and a compensating gas properties sensor contained within a no-flow chamber of the probe. The thermal flow sensor has activ...	03/20/2007
7188519	Device and method for measuring the flow and at least one material parameter of a fluid For measuring the flow and the thermal conductivity of a fluid, a sensor is used, which has a first temperature detector for measuring a first temperature and a second temperature detector for measuring a second temperature. A heating is arranged between the tempera...	03/13/2007
7165441	Sensor module having a sensor element surrounded by a heating element A sensor module having a heating structure and a sensor element is described. The heating structure surrounds the sensor element so that heat dissipation through a frame is largely prevented. This yields a greater measuring accuracy of the sensor module. In particul...	01/23/2007
7107835	Thermal mass flow sensor A thermal mass flow sensor is disclosed that includes a housing (16) having a first sensor region and a second sensor region, a first thin film temperature sensor (39) formed at the first sensor region and a second thin film temperature sensor (58	09/19/2006
7106955	Humidity controller A breathing assistance apparatus adapted to deliver humidified gases at a desired level of humidity to a patient including a humidifier and a heated conduit is disclosed. The humidifier includes a controller which determines the flow rate of the gases and then deter...	09/12/2006
7051589	Heating resistor flow rate measuring instrument A heating resistor flow rate measuring instrument, having a heating resistor and a thermally sensitive resistor disposed in a sub-passage of a main passage. The heating resistor is disposed in a portion of the sub-passage which has an upstream-side opening substanti...	05/30/2006
7040160	Flow sensor A flow sensor is described, in particular for analysis of gas flows, having a substrate and at least one sensor component which is sensitive to a flow of a medium, the sensor component being separated from the substrate in at least some areas by a region that is a p...	05/09/2006
7021135	Thermal mass flow sensor A thermal mass flow sensor is disclosed that includes a housing (16) having a first sensor region and a second sensor region, a first thin film temperature sensor (39) formed at the first sensor region and a second thin film temperature sensor (58	04/04/2006
6968283	Gas flow meter A gas flow meter having a gas flow detection circuit for detecting a current flowing through a resistor installed in a gas passage and a voltage generated across the resistor and outputting a voltage signal representing a gas flow passing through the gas passage; a ...	11/22/2005
6935172	Thermal type flow measuring device A thermal type flow measuring device comprises a heating resistor(HF), a temperature measuring resistor(Ru) upstream of the heating resistor(HF) with respect to a fluid(Q), and a temperature measuring resistor(Rd) downstream of the heating resistor(HF). A heat sensi...	08/30/2005
6932504	Heated self-detecting type cantilever for atomic force microscope A self-detecting type cantilever for an atomic force microscope (AFM) has an electro-flexural conversion element for converting a flexural amount of the cantilever into an electric current or voltage, a temperature measurement element disposed at a front end portion...	08/23/2005
6917886	Microflow based differential pressure sensor A differential pressure sensor based on pressure induced micro-flow that includes two connecting hoses that are considered when the pressure sensor is calibrated. The inventive differential pressure sensor includes a flexible hose as part of the device itself, and i...	07/12/2005
6907322	Method and apparatus for characterization of thermal response of GMR sensors in magnetic heads for disk drives A method and apparatus for characterization of a thermal response of giant magnetoresistive (GMR) sensors in magnetic read/write heads is provided. The method and apparatus make use of a probe to measure temperatures at a base and a tip of the probe. With the method...	06/14/2005
6658931	Fluid flow sensing and control method and apparatus A gas mass flow sensor or probe (35, 37, 39) of an air flow sensing and control system (17, 19, 21) based upon hot-wire type devices where flow sensing is achieved by controlling the difference between two temperature sensing elements (51 and 53) suspende...	12/09/2003
6553828	Cooled dual element thermocouple computer and flow velocity measurement method Embodiments of a flowmeter and velocity measurement method are described, which include preferably a dual element thermocouple that is immersed in a flowing fluid and a computer that processes, validates, and calculates data to arrive at a velocity measur...	04/29/2003
6318168	Thermal dispersion probe with microcomputer controller Thermal dispersion probes used as flowrate sensors in process control of a medium heated by a heater. The device includes a reference temperature sensor for producing an electrical signal indicative of the temperature of the medium in which it is immersed...	11/20/2001
5682899	Apparatus and method for continuous cardiac output monitoring A fluid volume flow monitoring apparatus, fluid volume flow monitoring system and process of monitoring fluid volume flow are disclosed. The fluid volume flow monitoring apparatus includes a support member having a distal end, a proximal end, and an outer...	11/04/1997
5629481	Mass air flow measurement system and method A mass air flow measurement system comprising a sensing device located in an air flow providing an output signal relational to an mount of mass air flow past the device, wherein the sensing device has an inherent sensor response time constant and acts to ...	05/13/1997
5515295	Methods and systems for fluid identification and flow rate determination Methods and systems for determining the identity and flow rate of a fluid are provided. Linearized output signals are provided. To determine fluid flow, a test fluid is passed through a conduit. A heater associated with the conduit is maintained a tempera...	05/07/1996
5461910	Fluid flow direction and velocity monitor A fluid flow detection monitor (80), particularly useful in monitoring pressure differentials between a controlled environment and its surroundings, includes a heat source (1) situated between an upstream and downstream thermal sensor (2,3) within a chann...	10/31/1995
5460039	Flow sensor system A system for measuring the flow rate of gas includes a flow head having a sensor thermoresistor mounted transversely to the flow of gas, and a reference thermoresistor mounted parallel to the flow of gas, both thermoresistors having equal resistance versu...	10/24/1995
5417110	Unit and system for sensing fluid velocity A unit and system for sensing fluid velocity which is particularly well suited for use in the control system of an HVAC unit. A salient feature of the system is the combination of heat generating structure, a plurality of thermally conductive elements, an...	05/23/1995
5383357	Mass air flow sensor device A mass air flow sensor device for determining the mass of air flowing therethrough is operatively associated with an engine control module of an internal combustion engine which uses data corresponding to the mass of air flowing to the engine for controll...	01/24/1995
5369994	Flow sensor The invention is directed to a flow sensor having a heater, two temperature measuring sensors, a heater temperature sensor and a medium temperature sensor. A control circuit is provided which controls the overtemperature of the heater in dependence upon t...	12/06/1994
5216743	Thermo-plastic heat exchanger The present invention provides a flow-through instantaneous fluid heater system designed to satisfy the need for a heater not limited by being connected to a storage tank and which can be made using a plastic casing, incorporating cool-down when out of se...	06/01/1993
5208650	Thermal dilation fiber optical flow sensor A thermal dilation type optical flow sensor includes an optical heating sce for heating a flowing fluid and a sensor disposed in a downstream direction from said heating source wherein the sensor includes a probe for varying a reflected light according t...	05/04/1993
5207227	Multiprobes with thermal diffusion flow monitor A single probe with thermal diffusion flow monitor (hereinafter known as "SPTDFM") that has improved reliability, smaller overall size, simpler method of sensor positioning, better compatibility and capability to monitor blood flow, pressure and other cri...	05/04/1993
5193388	Method and apparatus for determining the flow rate of a flowing fluid mass A method and apparatus controls the temperature of a precision resistor and, in turn, measures the flow rate of a flowing fluid mass. The precision resistor is a hot wire or hot film of an air mass meter of an internal combustion engine of a motor vehicle...	03/16/1993
5184509	Method and apparatus for measuring the air flow in the air intake passage of an internal combustion engine A method and a circuit arrangement for measuring the air flow in the air intake passage of an internal combustion engine provide an output pulse signal which can be easily processed in digital control devices. The unbalance voltage of a measuring bridge, ...	02/09/1993
5177696	Method of determination of gas properties at reference conditions A method of determination of gas properties at reference conditions of temperature and pressure. This determination is needed in systems including mass flow meters, combustion control systems, gas meters and the like. The system disclosed enables the dete...	01/05/1993
5150611	Flow sensor An apparatus for measuring the mass flow rate of air has a resistance bridge circuit, whose diagonal voltage is applied to a switching control element, which is in turn supplied with voltage pulses for heating a flow sensor probe. The switching control el...	09/29/1992
5048332	Flow meter for measuring fluid flow with multiple temperature sensors A part of a tube, through which a fluid passes, is cooled by means of an electronic cooling element and a flow rate of the fluid is measured on the basis of a temperature of a surface of the tube cooled. Not only can the flow rate of the liquid flowing th...	09/17/1991
4947889	Method of measuring flow rate and flow meter for use in said method as well as apparatus for controlling flow rate of liquid using said flow meter A part of a tube, through which a fluid passes, is cooled by means of an electronic cooling element and a flow rate of the fluid is measured on the basis of a temperature of a surface of the tube cooled. Not only can the flow rate of the liquid flowing th...	08/14/1990
4944035	Measurement of thermal conductivity and specific heat A method and apparatus for determining both the thermal conductivity, k, and specific heat, cp, of a fluid of interest are disclosed. An embodiment uses proximately positioned resistive heater and thermal sensor coupled by the fluid of interest...	07/24/1990
4914742	Thin film orthogonal microsensor for air flow and method A microbridge air flow sensor which has a sealed etched cavity beneath the silicon nitride diaphragm so that the cavity is not susceptible to contamination from residual films or other material accumulating within the cavity. The cavity thermally isolates...	04/03/1990
4884443	Control and detection circuitry for mass airflow sensors A mass airflow sensor is disclosed which uses a small, thin dielectric diaphragm providing good thermal isolation for thin-film heating and temperature sensing elements, resulting in high flow sensitivity and low current operation of the heating element. ...	12/05/1989
4881407	Hot wire air flow meter The bobbin (21) of the heating resistor (1) is made by zirconia or glass fiber. On the surface of the bobbin, a platinum film (31) or a platinum wire (23) are formed. At both ends of the heating resistor, the heating resistor is supported by a pair of sup...	11/21/1989
4843881	Fluid flow sensor system A mass flow sensing system in which two heating/sensing coils are disposed about a conduit through which the fluid passes, the coils being located up and down stream along the conduit and close proximity to one another. Each coil forms one leg of a bridge...	07/04/1989

«First «Previous1 2 Next»Last»

PatentStorm

Quotables

PatentStorm News

Class 73/204.16 - By control of a separate heating or cooling element