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THERMAL CALIBRATION SYSTEM

Subclass of:

374 - Thermal measuring and testing

Patent class list (only not empty are listed)

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Class / Patent application numberDescriptionNumber of patent applications / Date published
374002000 By thermal radiation emitting device (e.g., blackbody cavity) 14
374003000 By immersion in liquid having controlled temperature 2
20090110024TEMPERATURE COMPUTING INSTRUMENT AND METHOD FOR CALIBRATING TEMPERATURE OF SENSOR PART USED THEREFOR - A sensor part is provided with a printed circuit board that is made of resin and formed with a pair of electrically conductive metal patterns. Each of the pair of electrically conductive metal patterns includes: a first pattern part connected to a pair of electrodes of a temperature sensor; a second pattern part connected to a pair of conductive wires; and a connection part making a connection between the first and second pattern parts. The connection between the pair of electrodes of the temperature sensor and the first pattern part or between the pair of conductive wires and the second pattern part is made with the use of Dotite or solder.04-30-2009
20120269227METHOD OF CALIBRATING A HEATER SYSTEM - A method of calibrating a heater system for heating a surface of a structure, the heater system including a heater element, a temperature sensor proximate the heater element for outputting a signal indicative of the temperature of the heater element, and a controller for controlling the supply of power to the heater element in dependence on the signal to maintain the temperature of the heater element at a first substantially constant temperature. The method comprises: immersing the structure in a fluid for maintaining the surface of the structure at a second substantially constant temperature; supplying an amount of power to the heater element; receiving the signal from the temperature sensor and determining a temperature at the temperature sensor; and determining a setpoint temperature for controlling the heater element in dependence on the signal and the second substantially constant temperature.10-25-2012
Entries
DocumentTitleDate
20130028286System and Process for Calibrating Pyrometers in Thermal Processing Chambers - A method and system for calibrating temperature measurement devices, such as pyrometers, in thermal processing chambers are disclosed. According to the present invention, the system includes a calibrating light source that emits light energy onto a substrate contained in the thermal processing chamber. A light detector then detects the amount of light that is being transmitted through the substrate. The amount of detected light energy is then used to calibrate a temperature measurement device that is used in the system.01-31-2013
20130028285THERMOCOUPLE ABNORMALITY DETECTION SYSTEM AND DETECTION METHOD THEREOF - According to one embodiment, a thermocouple abnormality detection system including: a plurality of thermocouples each including a plurality of thermocouple wires housed in a sheath; a transmission signal conversion unit configured to convert a thermo-electromotive force generated by each of the plurality of the thermocouple wires to a transmission signal and to output the transmission signal; a transmission unit configured to transmit the transmission signal outputted from the transmission signal conversion unit; and an abnormality detection circuit configured to detect an abnormality of each of the plurality of the thermocouples by comparing, with each other, the transmission signals obtained from the plurality of thermocouple wires provided in each of the thermocouples.01-31-2013
20080259989Systems and Methods for Temperature Measurement Using N-Factor Coefficient Correction - Various systems and methods for temperature measurement are disclosed. For example, some embodiments of the present invention provide temperature measurement systems. Such temperature measurement systems include a variable current source and a diode connected transistor. The variable current source is capable of applying two or more distinct currents to the diode connected transistor. The currents result in a different base-emitter voltage on the diode connected transistor. The systems further include an n-factor coefficient register and an analog to digital converter. The analog to digital converter is operable to receive two of the base-emitter voltages created by applying the different currents, and to provide a digital output based at least in part on a value stored in the n-factor coefficient register and the two base-emitter voltages.10-23-2008
20100118911METHODS FOR MANUFACTURING A CONTACT TEMPERATURE SENSOR AND METHOD FOR CALIBRATING SAID SENSOR - A method for manufacturing a contact temperature sensor to be used at a temperature of use, including a) supplying a carbon fiber; b) heat treating of the fiber at a temperature higher than 800° C. and higher than the temperature of use; c) full layer depositing on the fiber, at a deposition temperature, an electrically insulating ceramic coating layer stable at the temperature of use, the ceramic material chosen among silica (SiO05-13-2010
20130083820Sensor Calibration - A method of calibrating a reversible-binding sensor for detecting an analyte includes: 04-04-2013
20120219033APPARATUS FOR DETECTING TEMPERATURE OF SWITCHING ELEMENTS - A temperature detecting apparatus includes an integrated circuit that integrates an overheating detecting circuit, a breakage detecting circuit and a disabling circuit, and an element connection terminal connecting a temperature sensing element. The disabling circuit disables the breakage detecting circuit from detecting a breakage of wire when a voltage at the element connection exceeds a disabling threshold which is set higher than an overheating detection threshold and a breakage detection threshold. A predetermined voltage higher than the disabling threshold is applied to the element connection terminal when the temperature sensing element is not connected to the element connection terminal.08-30-2012
20130070804METHOD FOR ESTIMATING AMBIENT AIR TEMPERATURE PRIOR TO COMBUSTION IN AN INTERNAL COMBUSTION ENGINE - A method to estimate ambient air temperature in the vicinity of a vehicle equipped with an internal combustion engine equipped with at least an ignition and an electronic control unit (ECU) with memory.03-21-2013
20130070805ON-CHIP TEMPERATURE SENSOR USING INTERCONNECT METAL - An accurate, cost-efficient temperature sensor may be integrated into an integrated circuit (IC) using common materials as the IC's interconnect metallization. The temperature sensor may include an impedance element having a length of metal made of the interconnect metal, a current source connected between a first set of contacts at opposite ends of the impedance element, and an analog-to-digital converter connected between a second set of contacts at opposite ends of the impedance element. The temperature sensor may exploits the proportional relationship between the metal's resistance and temperature to measure ambient temperature. Alternatively, such a temperature sensor may be used on disposable chemical sensors where the impedance element is made of a common metal as conductors that connect a sensor reactant to sensor contacts. In either case, because the impedance element is formed of a common metal as other interconnect, it is expected to incur low manufacturing costs.03-21-2013
20120224602CALIBRATION OF AN ON-DIE THERMAL SENSOR - A method of calibrating a thermal sensor includes setting a wafer to a control temperature. The wafer includes the thermal sensor and other chip logic. The method also includes applying power exclusively to a thermal sensor circuit, calibrating the thermal sensor, and storing a calibration result. The method also includes retrieving the calibration result upon application of power to the other chip logic.09-06-2012
20130163633THERMOCOUPLE WELDING TEST APPARATUS - A thermocouple welding test apparatus for testing whether a thermocouple is normally welded includes a first comparison circuit, a second comparison circuit, a switch circuit and an indication circuit. The first comparison circuit receives a first DC voltage from the thermocouple, and compares the first DC voltage with a first reference voltage to output a first control signal. The second comparison circuit receives a second DC voltage from the thermocouple, and compares the second DC voltage with a second reference voltage to output a second control signal. The switch circuit receives the first control signal and the second control signal, and outputs an indication signal accordingly. The indication circuit receives the indication signal, and indicates whether the thermocouple is normally welded accordingly.06-27-2013
20090010302METHOD AND DEVICE FOR IDENTIFYING A TEMPERATURE SENSOR CONNECTED TO A CONTROL UNIT - A controller of a hob is connected to a temperature sensor of a radiation based heating element. In principle, two different groups of temperature sensors can be used, whose resistance values differ by approximately a factor of three. When the hob is first used, the resistance of the temperature sensor is measured at room temperature and is classified in one of the two groups of temperature sensors on the basis of a limit value between the two typical temperature profiles of the groups of temperature sensors. On the basis of this, calibration of the controller is carried out for the purpose of adjusting to the established group to which the temperature sensor belongs.01-08-2009
20090010301TEMPERATURE DETECTION CIRCUIT - A temperature detection circuit includes a first voltage source circuit to generate a first voltage having a temperature dependence by utilizing a work function difference of gate electrodes of a plurality of field effect transistors, a second voltage source circuit to generate a reference voltage having no temperature dependence by utilizing a work function difference of gate electrodes of a plurality of field effect transistors, a correction circuit configured to correct the reference voltage and output a corrected voltage, and a subtraction amplifier configured to subtract the corrected voltage from the first voltage, amplify a resulting subtracted voltage, and output a resulting amplified voltage as a correction voltage signal to adjust a temperature coefficient of the correction voltage signal.01-08-2009
20090003405SENSOR RATIONALITY DIAGNOSTIC - A sensor diagnostic method, such as to determine rationality of one of three temperature sensors used in an exhaust aftertreatment system, includes determining the temperature difference between the first and second sensor, determining the temperature difference between the second and third sensor, determining whether the temperature differences are within an acceptable threshold range and comparing the two temperature differences to determine which sensor is in error, if any.01-01-2009
20120236899THERMOCOUPLE AND METHOD OF FORMING A THERMOCOUPLE ON A CONTOURED GAS TURBINE ENGINE COMPONENT - A method of forming a thermocouple (09-20-2012
20090086788TEMPERATURE SENSOR, DEVICE AND SYSTEM INCLUDING SAME, AND METHOD OF OPERATION - A temperature sensor and device and system including same comprise a switched capacitor circuit configured to generate a noise voltage in response to switching and circuitry configured to generate a relative temperature output signal proportional to an absolute temperature output signal in response to the noise voltage. The device includes a temperature sensors temperature sensitive device logic and temperature compensation logic configured to receive the absolute temperature and generate an adjustment signal to adapt the temperature sensitive device logic in response thereto. A related method for sensing temperature includes amplifying a noise voltage from a switched capacitor circuit in a plurality of parallel amplifier channels and removing amplifier noise from each of the plurality of parallel amplifier channels to form a relative output signal proportional to an absolute temperature.04-02-2009
20110299562Diverse and Redundant Resistance Temperature Detector - A diverse and redundant resistance temperature detector (“D&R RTD”) is provided. The D&R RTD is utilized in obtaining temperature readings in environments, such as fluids and gasses, by measuring electrical characteristics of the D&R RTD that are influenced by the temperature. Furthermore, the D&R RTD's are arranged such that a plurality of measurements can be obtained, which provides sufficient diversity and redundancy of the measurements for enhanced diagnostics to be performed, such as optimization for fast dynamic response, calibration stability, in-situ response time testability, and in-situ calibration testability.12-08-2011
20110286492SENSOR, AND METHOD FOR CONTINUOUSLY MEASURING THE FOULING LEVEL11-24-2011
20110286491METHOD FOR CALIBRATING AN ELECTRONIC CHIP, ELECTRONIC CHIP AND HEAT PATTERN DETECTOR FOR THIS METHOD - This method for calibrating an electronic chip comprises: 11-24-2011
20090201968Apparatus for measuring temperature - An apparatus for ascertaining and/or monitoring at least one temperature. The apparatus includes, according to a first variable, at least one temperature sensor, at least one reference temperature sensor, and at least one heating/cooling unit, which is thermally coupled with the temperature sensor and with the reference temperature sensor. According to a second variant, the invention includes that at least one reference temperature sensor, and the temperature sensor and the reference temperature sensor are embodied and placed in such a manner that they measure essentially the same temperature. At least one head transmitter is provided, which connects the temperature sensor and the reference temperature sensor with the head transmitter in such a manner that the head transmitter receives the data measured by the temperature sensor and the reference temperature sensor. At least one memory unit is provided, in which the measured data of the temperature sensor and the reference temperature sensor are storable.08-13-2009
20100103975CALIBRATION APPARATUS - A calibration apparatus for temperature probes comprising an elongate calibration chamber (04-29-2010
20090154519THERMOMETER CALIBRATION - A method for calibrating a thermometer is provided. The method includes deriving values of at least two different reference calibration coefficients of a reference calibration equation. The reference calibration equation relates temperature of a reference temperature sensor to at least two different calibration coefficients and a measured characteristic of the reference temperature sensor. A primary temperature sensor of the thermometer is calibrated using the derived values of the at least two different reference calibration coefficients. In another method for calibrating a thermometer, value of at least one reference calibration coefficient is derived from a reference calibration equation. The reference calibration equation is a non-linear equation relating the temperature of the reference temperature sensor to the at least one calibration coefficient and a measured characteristic of the reference temperature sensor.06-18-2009
20090147819CALIBRATION OF TEMPERATURE CONTROL SYSTEM FOR SEMICONDUCTOR PROCESSING CHAMBER - Methods and systems for calibrating a temperature control system in a vapor deposition chamber. A temperature sensor senses temperature within a semiconductor processing chamber and generates an output signal. A temperature control system controls a chamber temperature by controlling a heating apparatus based on the output signal. A method includes instructing the control system to target a setpoint temperature, and depositing a layer of material onto a surface in the chamber by a vapor deposition process. A variation of a property of the layer is measured while depositing the layer, the property known to vary cyclically as a thickness of the layer increases. The measured property is allowed to vary cyclically for one or more cycles. If there is a difference between a time period of one or more of the cycles and an expected time period associated with the setpoint temperature, the temperature control system is adjusted based on the difference.06-11-2009
20120140789System for verifying temperature measurement - The present application is directed to a system for verifying calibration of a temperature sensor comprising an above-ambient temperature verifier and a below-ambient temperature verifier. The above-ambient temperature verifier includes a first housing containing an ohmic material. At least one pair of electrodes is provided to direct an applied current through the ohmic material to heat the material. A well is provided within the ohmic material for accepting a temperature sensor. A compression assembly cooperates with the ohmic material to create intimate contact with the temperature sensor. An above-ambient reference temperature monitor maintains a calibrated temperature within the ohmic material. The below-ambient temperature verifier includes a second housing and a below-ambient reference temperature monitor to maintain a calibrated temperature of a below-ambient temperature medium. The system further includes the ability to log all temperature test measurements from an RFID tag located on each temperature sensor to be verified.06-07-2012
20080317087Calibrating Method of Current Detection Type Thermocouple or the Like, Calibration Method of Offset of Operational Amplifier, Current Detection Type Thermocouple, Infrared Sensor and Infrared Detector - To calibrate a thermocouple, a calibrating thermocouple, made of the same thermocouple material as a detecting thermocouple, is used. An absolute thermoelectric power E12-25-2008
20100226408THERMAL DETECTOR TESTING DEVICE - A testing device for testing thermal detectors includes a hollow sleeve, open on at least one end, configured to receive a thermal detector. The hollow sleeve can have a length greater than a diameter. A heater is positioned is in proximity to the hollow sleeve, and is configured to provide heat for testing the thermal detector. The heater can be a flexible foil heater. A power source is provided to supply power to the heater. A power control module can be provided for variably adjusting a set point temperature or a rate of temperature rise for the heater.09-09-2010
20100195693ABNORMALITY DETERMINATION APPARATUS AND ABNORMALITY DETERMINATION METHOD FOR OIL TEMPERATURE SENSOR - Until the accuracy in calculation of an estimated oil temperature value which is calculated by means of a heat dissipation amount map reaches a predetermined level, an ECU determines, when a transmission oil temperature well exceeds a predetermined temperature after the engine start, whether or not an oil temperature sensor fails. When it is determined that the oil temperature sensor is normal, the ECU uses the detected oil temperature value to learn about the heat dissipation map. When the accuracy in calculation of the estimated oil temperature value reaches the predetermined level through the learning about the heat dissipation amount map, the ECU determines whether or not the oil temperature sensor fails based on the divergence of the detected oil temperature value relative to the estimated oil temperature value.08-05-2010
20090262776METHOD AND APPARATUS FOR CALIBRATING A THERMISTOR - The presently described embodiments are directed to a calibration method and system for thin film thermistors that are locally heated with integrated thin film heaters. Initially, print head temperature is either measured or referenced. Then, transient thermistor resistances are measured and used to determine the thermistor resistance at a higher temperature. Notably, this calibration method is advantageously implemented as a step of an existing process without having to expose the print heads to operating temperatures. In some implementations of the presently described embodiments, trimming of the thermistors may be required once calibrated.10-22-2009
20090296770FLUORESCENT TEMPERATURE SENSOR - To provide a fluorescent temperature sensor capable of identifying easily the location of a failure. A fluorescent temperature sensor for producing a temperature signal from fluorescent light from a fluorescent material and that has been optically stimulated comprises a light projecting module having an LED for projecting light at the fluorescent material and a second photodiode for receiving light emitted from the LED and a light receiving module having a first photodiode for receiving the light emitted from the fluorescent material, where the location of a failure in the sensor can be identified based on, at least, the output signal from the second photodiode.12-03-2009
20090296769CALIBRATION OF TEMPERATURE SENSING CIRCUITRY IN AN ELECTRONIC DEVICE - Temperature sensing circuitry is used for thermal management of an electronic device. The temperature sensing circuitry includes at least one thermistor placed at or near a component of the electronic device. The temperature sensing circuitry also includes a high-precision resistor for calibration purposes. The resistance of the resistor is equivalent to the resistance of the thermistor at a reference temperature. A calibration reading is obtained using a set current that is being passed through the resistor. An error present in the temperature sensing circuitry is determined based on the calibration reading and a design value. A temperature measurement associated with the component is then made using the thermistor, while the set current is being passed through the thermistor. The error is corrected in the temperature measurement of the component. Other embodiments are also described.12-03-2009
20120294327Methods And Systems For Temperature Compensated Temperature Measurements - Methods and systems for compensating temperature measurements by a temperature gauge comprising a first temperature sensor and a second reference temperature sensor, having different thermal properties, located in the same temperature environment to be measured. The methods and systems compensate for errors in the measured temperatures due to variations in the reference sensor caused by temperature effects.11-22-2012
20090003406Thermal switch calibration apparatus and methods - An apparatus and method for testing thermal switches is disclosed including modulating the temperature of a receiver in thermal contact with a thermal switch at a first rate within a range containing the nominal switch temperature of the thermal switch. A first temperature at which the switch changes state is recorded. The temperature is then modulated at a second rate and a second temperature at which the switch again changes state is recorded. The temperature may be modulated at a third rate slower than the second rate to determine a third temperature. The first, second, and third switch temperatures are then processed and output to an operator. The first, second, and third rates may be determined according to an exponentially decreasing function.01-01-2009
20120033705METHOD AND DEVICE FOR DIAGNOSING A THERMOSTAT - In a method for diagnosing a faulty thermostat in a coolant circuit, in particular for an internal combustion engine, having a fan, the faulty thermostat is detected as a function of a measured temperature and a setpoint temperature, the fan being turned on at least temporarily during the diagnosis.02-09-2012
20090129430Method for Monitoring the Functionality of a Temperature Sensor - In a method for monitoring the functionality of a temperature sensor that can deliver an electrical signal as a function of the measured temperature and is disposed, in particular, in the cooling water circuit of an internal combustion engine, the persistence of the temperature sensor in the high signal range is made possible by a method encompassing the following steps: Characterizing the sensor as possibly faulty if the sensor indicates, upon engine shutdown, at least a maximum value of the cooling fluid temperature; determining a first gradient of the cooling fluid temperature, measured by the possibly faulty sensor, up to a first point in time after engine shutdown, and characterizing the sensor as fault-free if the gradient exceeds a minimum value; determining a second gradient of the cooling fluid temperature, measured by the possibly faulty sensor, between the point in time and a point in time after engine shutdown, and characterizing the sensor as fault-free if the second gradient exceeds a minimum value; determining the cooling fluid temperature measured by the possibly faulty sensor at a point in time after engine shutdown, and characterizing the sensor as fault-free if the cooling fluid temperature falls below a maximum value.05-21-2009
20120069865Method for Testing a Thermography Apparatus, Designed for Carrying out a Thermography Method, for its Correct Operation, Test Component Therefor and Method for its Production - A test component coated with a coating system is provided. In at least one defined region of the test component, there is a delamination having defined properties deliberately introduced into the coating system. The test component may be employed in a method for testing a thermography apparatus that is designed for carrying out a thermography method, for its correct operation with a view to the detection of delaminations. In order to test the thermography apparatus, the at least one defined delamination of the coating system is detected on the test component by using the thermography method employed in the thermography apparatus.03-22-2012
20090252193Device and Method for Calibrating a Fiber-Optic Temperature Measuring System - A device for calibrating a fiber-optic temperature measuring system has a broadband light source, a coupling-in device, which can couple light generated by the light source for calibration into an optical fiber of the temperature measuring system, a coupling-out device, which can couple components of the light source-generated light that are backscattered in the optical fiber out of the optical fiber. An evaluation device performs a calibration of the temperature measuring system on the basis of the backscattered components of the light.10-08-2009
20110222576METHOD FOR CALIBRATING A SUPERHEAT SENSOR - A method for calibrating a superheat sensor (09-15-2011
20090080490Systems, Devices, and/or Methods for Managing a Thermocouple Module - Certain exemplary embodiments can provide a system, which can comprise a thermocouple input module. The thermocouple input module can be adapted to determine one or more calibration factors. The thermocouple input module can be adapted to store the calibration factors. The thermocouple input module can be adapted to apply the calibration factors to an incoming thermocouple voltage value to obtain an adjusted thermocouple voltage value.03-26-2009
20130121366METHODS OF MEASURING CONDITIONS OF AN ULTRASONIC INSTRUMENT - A method of measuring conditions of an ultrasonic instrument includes providing an ultrasonic instrument that includes an end effector and a waveguide operably coupled to a generator and the end effector. The method involves generating one or more pulses with the generator, transmitting the one or more pulses to one or both of the waveguide and the end effector, generating one or more waves that scatter in an interferential pattern in response to the transmission of the one or more pulses, registering a signal indicative of the interferential pattern, generating an actual interferential pattern based upon the signal, and identifying one or more conditions of the end effector based upon the actual interferential pattern.05-16-2013
20130121367SENSOR AUTO-CALIBRATION - Aspects of the disclosure relate to computing technologies. In particular, aspects of the disclosure relate to mobile computing device technologies, such as systems, methods, apparatuses, and computer-readable media for improving calibration data by increasing the diversity of orientations used for generating the calibration data. In one embodiment, the computing device receives a plurality of calibration measurements associated with one or more sensors of a device, determines a degree to which the plurality of calibration measurements were captured at different orientations of the device, and determines, based on the degree, whether to update one or more calibration parameters.05-16-2013
20080259990TEMPERATURE SENSOR CIRCUIT AND CALIBRATION METHOD THEREOF - A temperature sensor circuit comprises a first monitor voltage generation circuit that generates a first monitor voltage with a characteristic that changes with respect to temperature; a second monitor voltage generation circuit that generates a second monitor voltage with a characteristic that changes by a variation amount different from the first monitor voltage with respect to the temperature; and a differential amplifier circuit, to which the first and second monitor voltages are inputted and that outputs the result of comparing the two voltages. Further, the differential amplifier circuit of the temperature sensor circuit is capable of switching to a first connection state, which outputs the comparison result, and to a second connection state, which outputs an offset monitor voltage that is rendered by adding the offset voltage of the differential amplifier circuit to the first or second monitor voltage or subtracting the offset voltage therefrom.10-23-2008
20100265986CALIBRATED ASSEMBLY FOR IR THERMOMETER APPARATUS - A tip assembly for an IR thermometer apparatus includes a heat sink having a heat sink cavity and a tip section and a fluid path and at least one hydraulic port. The tip assembly also includes an IR sensor mechanically seated in the tip section and thermally coupled to the heat sink. The tip assembly also includes an electrical connector configured to provide an electrical connection to the tip assembly. A fluid having a fluid temperature is introduced into the fluid path via the hydraulic port. The fluid causes the heat sink and the IR sensor to substantially reach one or more pre-determined temperatures by thermal conduction during calibration of the tip assembly. Another tip assembly having an internal heat source is described. Another tip assembly having an internal heat pump is described. A method to calibrate a tip assembly is also described.10-21-2010
20080232425LOCATION DEPENDENT CALIBRATION FOR DISTRIBUTED TEMPERATURE SENSOR MEASUREMENTS - A method for calibrating distributed temperature sensing (DTS) systems is disclosed. The method includes: receiving temperature data associated with one or more locations along a length of an optical fiber; calculating a set of unique calibration coefficients specific to each of the one or more locations along the fiber length; and applying the set of calibration coefficients specific to each of the one or more locations along the fiber length to the temperature data for calibrated correction thereof. Also disclosed is a system for calibrating DTS data and a wellbore for providing calibrated DTS data.09-25-2008
20100002744Method And System For Calibrating A Motor Control Circuit To Improve Temperature Measurement In An Electrical Motor - A method enables measurement of an inverter loss within a motor control circuit for an appliance. The method includes applying a constant DC current generated from a first AC supply voltage to a motor winding through an inverter at a first duty cycle, measuring a first voltage corresponding to the current through the motor at a motor current sense resistor, computing a first ratio of the first measured voltage at the motor current sense resistor to a first DC input voltage corresponding to the first AC supply voltage, identifying a second duty cycle from the first computed ratio, comparing the second duty cycle to the first duty cycle, and identifying a first inverter loss factor from the difference between the first duty cycle and the second duty cycle.01-07-2010
20090168832TEMPERATURE SENSOR DIAGNOSTICS - A temperature sensor diagnostic system for a vehicle comprises a deviation calculation module, a limits determination module, and a fault diagnostic module. The deviation calculation module calculates a deviation coefficient based on a time constant of a temperature sensor and a period between first and second temperatures measured by the temperature sensor, wherein the second temperature is measured after the first temperature. The limits determination module determines upper and lower temperature limits based on the first temperature and the deviation coefficient. The fault diagnostic module selectively diagnoses a fault in the temperature sensor when the second temperature is one of greater than the upper temperature limit and less than the lower temperature limit.07-02-2009
20090110023BOLOMETRIC ON-CHIP TEMPERATURE SENSOR - Disclosed are embodiments of an improved on-chip temperature sensing circuit, based on bolometry, which provides self calibration of the on-chip temperature sensors for ideality and an associated method of sensing temperature at a specific on-chip location. The circuit comprises a temperature sensor, an identical reference sensor with a thermally coupled heater and a comparator. The comparator is adapted to receive and compare the outputs from both the temperature and reference sensors and to drive the heater with current until the outputs match. Based on the current forced into the heater, the temperature rise of the reference sensor can be calculated, which in this state, is equal to that of the temperature sensor.04-30-2009
20110116527SELF-CALIBRATING, WIDE-RANGE TEMPERATURE SENSOR - A self-calibrating, wide-range temperature sensor includes a current reference, impervious to process and voltage, with the current reference mirrored into two oppositely-sized bipolar transistors or diodes. Duplicate current sources are used with a ratio of geometries between them, such that the larger current biases the smaller bipolar transistor (less cross-sectional area) and the smaller current source biases the larger bipolar transistor (higher cross-sectional area). The current source in conjunction with the differential temperature sensing provides inherent calibration without drift while the differential sensing, from the ratio of geometries in the current paths also increases sensitivity.05-19-2011
20110019713SYSTEM AND METHOD FOR AUTOMATICALLY CALIBRATING A TEMPERATURE SENSOR - There is provided a system and method for automatically calibrating a temperature sensor. More specifically, there is provided a system including a temperature sensor that includes a first resistance configured to indicate a temperature of the temperature sensor and a second resistance, in series with the first resistor, wherein the second resistance is adjustable to calibrate the first resistance, and a calibration circuit, coupled to the temperature sensor and configured to automatically calibrate the first resistance.01-27-2011
20080291964Temperature Sensing - A TGT measurement system comprises a plurality of thermocouples connected in parallel to a distributor, and a data storage device carrying calibration data relating to at least one of the thermocouples.11-27-2008
20110110392Method of Calibrating a Position Sensor in a Motor Vehicle Gear - A method of calibrating a position sensor in an automotive transmission having a transmission housing having mounted therein a casing (05-12-2011
20090147820AVOIDING AIR FLOW PENETRATION IN TEMPERATURE MEASUREMENT - In one example embodiment, a board for measuring device temperatures comprises a base and one or more fingers extending from the base. The base and the one or more fingers comprise a flexible material. One or more first temperature sensors are disposed on the one or more fingers. One or more second temperature sensors are disposed on the base. Each of the first and second temperature sensors comprises a partially thermally isolated temperature sensor.06-11-2009
20090310642MULTIPLE SENSOR FIBER OPTIC SENSING SYSTEM - A multiple sensor fiber optic sensing system. A method of sensing distributed temperature and at least another property in a well includes the steps of: interconnecting an optical switch to an optical fiber which extends along a wellbore in the well; operating the optical switch to optically connect the optical fiber to an interferometric measurement system; and operating the optical switch to optically connect the optical fiber to a distributed temperature measurement system. Another method includes the steps of: installing an optical fiber along a wellbore in the well, the optical fiber being a first distributed temperature sensor, the installing step including providing a substantial length of the optical fiber proximate a second sensor which senses the well property; and calibrating the second sensor using a temperature sensed by the first sensor in the substantial length of the optical fiber.12-17-2009
20100054298OPTICAL FIBER TEMPERATURE SENSOR - The present invention relates to an optical fiber temperature sensor capable of reducing an error in a temperature measurement. The sensor comprises an optical fiber, an optical frequency difference adjusting section, a light source system, a spectrum measuring section, a temperature calculating section, and a correcting section. The light source system outputs, into different ends of the optical fiber, probe light and pumping light of which each center frequency is set corresponding to an instruction from the optical frequency difference indicating section respectively. The temperature calculating section calculates a temperature of an object based on BGS in a first domain measured by the spectrum measuring section. On the other hand, the correcting section outputs a correction instruction to the light source system so that BGS center frequency of a second domain may be in agreement with a reference value thereof.03-04-2010
20090028208Analyte collection devices and methods - An aspect of the invention is directed to a method for operating an analyte collection device of the type that includes at least one plate for storing said analyte. An example method comprises the steps of heating the at least one plate to a first temperature, taking a measurement of a property of the at least one plate, and using the measurement to estimate one or more of the amount of the analyte on the plate and the amount of contaminant on the plate.01-29-2009
20110249699Zero-heat-flux, deep tissue temperature measurement devices with thermal sensor calibration - A zero-heat-flux DTT measurement device is constituted of a flexible substrate supporting an electrical circuit including a heater trace defining a heater, thermal sensors, and a thermal sensor calibration circuit.10-13-2011
20120120981METHOD AND DEVICE FOR MONITORING A COMPONENT ARRANGED IN AN EXHAUST REGION OF AN INTERNAL COMBUSTION ENGINE - The invention relates to a method for monitoring a sensor unit (05-17-2012
20120201267LOW TEMPERATURE MEASUREMENT AND CONTROL USING LOW TEMPERATURE PYROMETRY - Embodiments of the present invention generally relate to methods and apparatus for measuring, calibrating, and controlling substrate temperature during low temperature and high temperature processing. In one embodiment, the method includes epitaxially forming a layer stack on a substrate placed on a support plate, measuring a temperature of the substrate with a first pyrometer disposed over the substrate, measuring a temperature of the support plate with a second pyrometer disposed below the support plate, calibrating the first pyrometer at multiple temperature points based on actual temperature readings of the substrate to generate a first set of calibrated temperature readings associated with the substrate, calibrating the second pyrometer using the set of calibrated temperature readings as a reference to generate a second set of calibrated temperature readings associated with the support plate, and controlling a power supplied to a heat source configured to heat the substrate based on the second set of calibrated temperature readings.08-09-2012
20110150029APPARATUS AND METHODS FOR TEMPERATURE CALIBRATION AND SENSING - Some embodiments include apparatus and methods having a first switch, a second switch, and a circuit coupled to the first and second switches. The first switch may be configured to switch between an on-state and an off-state based on a value of a first current flowing through a number of resistors and a diode coupled in series with the resistors. The second switch may be configured to switch between the on-state and the off-state based on a value of a second current on a circuit path. The second current is a function of a voltage at a node between two of the resistors and a resistance of the circuit path. The circuit may be configured to provide a temperature reading based on the number of times the first switch or the second switch switches between the on-state and the off-state during a time interval.06-23-2011
20110150028SELF-CALIBRATION CIRCUIT AND METHOD FOR JUNCTION TEMPERATURE ESTIMATION - The present invention relates to a calibration circuit, computer program product, and method of calibrating a junction temperature measurement of a semiconductor element, wherein respective forward voltages at junctions of the semiconductor element and a reference temperature sensor are measured, and an absolute ambient temperature is determined by using the reference temperature sensor, and the junction temperature of the semiconductor element is predicted based on the absolute ambient temperature and the measured forward voltages.06-23-2011
20110150027MECHANICAL AND ELECTRONIC TEMPERATURE READING SYSTEM WITH BUILT-IN FAILURE AND INACCURACY DETECTION - Temperature-indicting system including a mechanical temperature-indicating system including a bourdon tube for directly driving an indicating pointer, and an electrical temperature-indicating system including an electronic sensor, a transmitter and one or more electrical switches. The transmitter is modular and easily replaceable. Output of the pointer and the transmitter is synchronized relative to accuracy so that comparison of switch points of the switches that correlate temperature determined by the mechanical system and temperature determined by the electronic system enables detection of a failure or inaccuracy in one or both systems.06-23-2011
20080240200Method and Device for Controlling an Internal Combustion Engine - On the fulfillment of a specified condition, a temperature signal outside an actuating device is detected to which a piezoelectric actuator is assigned. A piezoelectric temperature value is determined by the temperature signal. A temperature-capacitance characteristic value of the piezoelectric actuator is determined by the piezoelectric temperature value through specified mapping. A measured capacitance characteristic value is determined by a detected piezoelectric actuator charge and voltage corresponding to the temperature signal. A first correction capacitance characteristic value is determined by the measured capacitance characteristic value and the temperature-capacitance characteristic value. Independently, the charge and the voltage of the piezoelectric actuator is detected and the measured capacitance characteristic value is determined on the basis of these. The piezoelectric temperature value is determined by the measured capacitance characteristic value and the first correction capacitance characteristic value through inverse mapping with respect to the temperature and the capacitance characteristic value.10-02-2008
20100098130HIGH-PRESSURE TANK TEMPERATURE DETECTION SYSTEM AND HIGH-PRESSURE TANK SYSTEM - In a hydrogen tank, discharge of a hydrogen gas may cause lowering of the temperature to a value at which it is assumed that disconnection has occurred in a thermistor. A temperature detection system for the hydrogen tank estimates the possibility that the temperature of the hydrogen tank is below this temperature value, according to the ambient temperature and the internal pressure. Only when there is no possibility that the temperature is below the value, disconnection is judged to have occurred.04-22-2010
20100309947METHOD AND ASSEMBLY FOR DETERMINING THE TEMPERATURE OF A TEST SENSOR - Methods and systems accurately determine an analyte concentration in a fluid sample. In an example embodiment, a receiving port receives a test sensor. The test sensor includes a fluid-receiving area for receiving a fluid sample. The fluid-receiving area contains a reagent that produces a measurable reaction with an analyte in the fluid sample. The test sensor has a test-sensor temperature and the reagent has a reagent temperature. A measurement system measures the reaction between the reagent and the analyte. A temperature-measuring system measures the test sensor temperature when the test sensor is received into the receiving port. A concentration of the analyte in the fluid sample is determined according to the measurement of the reaction and the measurement of the test sensor temperature. A diagnostic system determines an accuracy of the temperature-measuring system. The calculation of the analyte concentration may be adjusted according to the accuracy of temperature-measuring system.12-09-2010
20110164651OPEN-LOOP VERTICAL DRYWELL GRADIENT CORRECTION SYSTEM AND METHOD - A system and method are disclosed for controlling a drywell including a receiver having upper and lower ends with the lower end being more insulated than the upper and having a temperature sensor in thermal contact therewith. Upper and lower heaters are in thermal contact with the upper and lower ends respectively. A controller includes an integrated circuit having a temperature sensor. A reading from the integrated circuit is used to control power to the upper heater and reduce a temperature gradient between the upper and lower ends of the receiver.07-07-2011
20090201969CIRCUIT ARRANGEMENT TO ADJUST AND CALIBRATE A MEMS-SENSOR DEVICE FOR FLOW MEASUREMENT OF GASES OR LIQUIDS - Circuitry is disclosed for the calibration of heating element and ambient temperature sensors, comprising: a) an amplifier having positive and negative inputs, and an output; b) one or more heating MOS transistors selectably coupled in parallel and having 1) a heating transistor drain coupled to the positive input of the amplifier; 2) a heating transistor source configured to receive a supply voltage; and 3) a heating transistor gate coupled to the amplifier output; c) one or more ambient MOS transistors selectably coupled in parallel and having 1) an ambient transistor drain, 2) an ambient transistor gate coupled to the amplifier output; and 3) an ambient transistor source configured to receive the supply voltage; d) a temperature difference resistance configured: 1) to be coupled at least partially between an ambient connection and the ambient transistor drain; and 2) to be coupled at least partially between the ambient connection and the negative input of the amplifier.08-13-2009
20100020842System and method for temperature measurement - A method for precision thermal measurement and control, especially for bioreactors, as well as the correction of temperature sensitive probes such as pH and dissolved oxygen. Typical control requirements are ±0.1° C. The thermal measurement circuit converts a sensor output to a high level voltage or current with great accuracy and provides noise immunity and sensor isolation. While digital outputs from sensor converters can have the greatest noise immunity, the noise associated with digital circuitry may contaminate low level sensor signals so in many cases an analog sensor converter is preferred because of low noise generation, especially if the converter is near the sensor. The circuit is low cost, reliable, generates minimal heat is immune to, and does not generate noise, and requires minimal calibration effort.01-28-2010
20120307859Imaging Measuring System and Measuring Method for Measuring Thermal Output to a Target Object - An imaging thermographic measuring system to measure the thermal output (Q12-06-2012
20100142583System, method, and apparatus for the calibration of analog type thermometers for use in providing temperature quality control in the production of beverage and/or food products - An analog thermometer calibration apparatus may comprise a substantially flat piece of steel or other suitably rigid material having at least one hexagonal or appropriately non-circular shaped aperture or opening formed designed to be at least generally complimentary in size and shape to the calibration adjustment member or projection of an analog type thermometer such that the two may engage in a substantially complimentary manner that will permit rotation of the thermometer readout dial and to prevent the relative rotation of the base or lower portion of the analog thermometer connected to a temperature sensing stem probe during the rotation of the analog thermometer dial face during a calibration procedure. A round or other suitably shaped aperture opening may be included to accommodate support and passage of the temperature sensing probe of a more accurate digital type thermometer (or a recently calibrated thermometer of any type) in order to provide a calibration reference temperature reading. The dial of an analog thermometer may be rotated relative to the base and temperature sensing probe stem portion until the temperature indication pointer on the dial face of the analog thermometer substantially equals or matches the reference temperature reading of the digital thermometer reading or the known temperature of the calibration reference liquid without the need to remove, adjust and/or reinsert the analog thermometer into the calibration reference temperature liquid multiple times to perform an accurate analog thermometer temperature readout calibration process on one or a plurality of analog thermometers in a substantially simultaneous manner.06-10-2010
20120170608METHOD OF CALIBRATING A TEMPERATURE SENSOR OF A CHEMICAL MICROREACTOR AND ANALYZER FOR BIOCHEMICAL ANALYSES - A method of calibrating a temperature sensor of a chemical microreactor envisages: determining an airflow along a path in such a way as to cause a thermal exchange between the airflow and a chemical microreactor, which is provided with an on-board temperature sensor and is set along the path; and detecting a temperature in the airflow downstream of the microreactor, in conditions of thermal equilibrium.07-05-2012
20100172391Method for Testing a Frying Oil Tester - A method for testing a measuring device is used to determine a permittivity of a frying fat which permittivity is inter alia dependent on the temperature, while taking into consideration the temperature. The method is characterized in that the permittivity is measured at least two different temperatures and the temperature dependence is determined and is used to make a statement on the ability to function of the measuring device.07-08-2010
20120027044INSTRUMENTATION AND METHOD FOR OPTICAL MEASUREMENT OF SAMPLES - An optical measurement instrument includes one or more temperature sensors (02-02-2012
20120106590THERMOSTAT DIAGNOSTIC APPARATUS - A thermostat diagnostic apparatus is provided with a cooling medium temperature sensor, an engine operating condition sensor and a malfunction diagnosing device. The malfunction diagnosing device is configured to diagnose a stuck-open malfunction of a thermostat provided in a coolant flow passage of an engine installed in a mobile body based on a comparison of a real cooling medium temperature detected by the cooling medium temperature sensor and an estimated cooling medium temperature estimated based on an engine operating condition of the engine detected by the engine operating condition sensor. The malfunction diagnosing device determines that the thermostat is stuck in an open state upon determining that either the estimated cooling medium temperature or the real cooling medium temperature exceeds a prescribed reference value during a period in which an increased heat exchange rate condition of a radiator is satisfied continuously.05-03-2012
20120106589BODY TEMPERATURE MEASURING SYSTEM, DATA READING DEVICE, AND DRIVING CONTROL METHOD THEREOF - In a body temperature measuring system, power consumption of a data reading device is reduced. A clinical thermometer of this invention is a body temperature measuring system including a body temperature tag and a data reading device. A processing unit of the body temperature tag includes a power supply circuit, a semiconductor temperature sensor for detecting a band gap voltage, and a storage unit configured to store calibration data to calibrate the detected band gap voltage, and is configured to, upon activating the power supply circuit, send the detected band gap voltage via the antenna unit together with the calibration data. The data reading device includes an excitation unit, and a sensing unit configured to sense a change in a magnetic field generated by excitation. The power level of the excitation unit is changed upon sensing the change in the magnetic field.05-03-2012
20120250722Calibrated Fire Detection Cable - A system and method for providing greatly improved linear heat detection using fiber optic distributed temperature systems (DTS). The invention makes use of correction algorithms based on proportional-integral-derivative notions that anticipate exterior temperature increases based on the rate of measured temperature changes.10-04-2012
20100246630Thermocouple temperature sensor with connection detection circuitry - An assembly includes a thermocouple, a cold junction sensor, and a circuit. The thermocouple has a process end and a cold junction end. The cold junction end has first and second cold junction terminals. The cold junction sensor is supported near the cold junction end and configured to measure temperature at the cold junction end. The circuit is electrically connected to the cold junction sensor and to the first and second cold junction terminals. The circuit is configured to produce a thermocouple signal as a function of voltage across the first and second cold junction terminals and to produce a cold junction sensor signal as a function of temperature of the cold junction end as measured by the cold junction sensor. The circuit is further configured to calculate a correlation between the thermocouple signal and the cold junction sensor signal.09-30-2010
20090110022THERMISTOR CIRCUIT CALIBRATION - Temperature detection circuitry is selectively coupled to a thermistor and one of two sources representing the impedance at respective ends of the expected range of temperature to which the thermistor is to be exposed. The offset of an amplifier and a scale factor to account for gain set of the amplifier are determined in an automatic calibration process while coupled to the source(s), and thereafter temperature readings are taken from the thermistor. During the calibration process, if the gain or scale factor are outside of expected ranges, a failure is determined and an alarm given and/or a heater is disabled.04-30-2009
20100008394TEMPERATURE AND TEMPERATURE DISTRIBUTION SENSING WITH HIGH RESOLUTION IN MICROSCOPIC ELECTRONIC DEVICES AND BIOLOGICAL OBJECTS - The present invention relates to a method of measuring a temperature and/or temperature distribution at a resolution <1 &mgr; m in an object and to a device for performing such method, more particularly to a microscope for performing such method. The method comprises applying a molecular thermometer embedded in a matrix layer on an object, photoexciting the said molecular thermometer with a light source of said microscope and measuring emission of radiation from said molecular thermometer with two photodetectors of said microscope. A first intensity at a first wavelength is measured by said first detector, a second intensity at a second wavelength is measured by said second.detector, and a ratio of said intensities is calculated and used to determine a temperature with a calibrated curve. Said microscope is a confocal microscope or a stimulated emission depletion (STED) microscope.01-14-2010
20130022075TEMPERATURE SENSOR HAVING MEANS FOR IN-SITU CALIBRATION - A temperature sensor is disclosed as having a resistance thermocouple, accommodated in a sensor housing, for detecting a process temperature. The thermocouple can be connected via a multipole electric line to an electronic temperature transmitter for measured-value conditioning, the resistance thermocouple being equipped for in-situ calibration with a Johnson noise thermometer for determination of a reference temperature.01-24-2013
20120250721TEMPERATURE MEASUREMENT CIRCUIT AND TEMPERATURE MEASUREMENT METHOD - A temperature measurement circuit includes a sensing unit and a temperature translation unit. The sensing unit is arranged for generating a positive temperature coefficient characteristic and a negative temperature coefficient characteristic according to a temperature. The temperature translation unit is coupled to the sensing unit, and is arranged for generating a measured temperature according to the positive temperature coefficient characteristic and the negative temperature coefficient characteristic.10-04-2012
20130136149TEMPERATURE SENSOR WITH DIGITAL TRIM AND TRIMMING METHOD THEREOF - A method for calibrating a temperature sensor comprises: receiving first and second reference voltages from respective first and second tap points within a string of sequentially connected resistive devices of the temperature sensor. Each resistive device has a resistance that varies as a function of temperature. The receiving is performed at two or more known temperatures. A respective code is output corresponding to each respective one of the two or more known temperatures, based on the first and second reference voltages. At least one of the tap points is adjusted, based on the two or more known temperatures and the respective output codes.05-30-2013
20110216803SYSTEM AND PROCESS FOR CALIBRATING PYROMETERS IN THERMAL PROCESSING CHAMBERS - A method and system for calibrating temperature measurement devices, such as pyrometers, in thermal processing chambers are disclosed. According to the present invention, the system includes a calibrating light source that emits light energy onto a substrate contained in the thermal processing chamber. A light detector then detects the amount of light that is being transmitted through the substrate. The amount of detected light energy is then used to calibrate a temperature measurement device that is used in the system.09-08-2011
20130148687OPEN-LOOP VERTICAL DRYWELL GRADIENT CORRECTION SYSTEM AND METHOD - A system and method are disclosed for controlling a drywell including a receiver having upper and lower ends with the lower end being more insulated than the upper end having a temperature sensor in thermal contact therewith. Upper and lower heating elements are in thermal contact with the upper and lower ends, respectively. A controller includes an integrated circuit having a temperature sensor. A reading from the integrated circuit is used to control power to the upper heating element and reduce a temperature gradient between the upper and lower ends of the receiver.06-13-2013
20120275485Cargo Deck For A Cargo Hold Of An Aircraft And Method For Monitoring The Temperature Of A Container, A Pallet Or A Similar Unit Load Device (ULD) Disposed On A Cargo Hold Floor - Disclosed is a cargo deck for a cargo hold of an aircraft, comprising at least one temperature measuring device for non-contacting measurement of the temperature of a container, a pallet or a similar unit load device (ULD).11-01-2012
20120275484TEMPERATURE MEASURING DEVICE, TEMPERATURE CALIBRATING DEVICE AND TEMPERATURE CALIBRATING METHOD - A temperature measuring device which measures a temperature of a heat treatment mechanism in a heat treatment apparatus which heat-treats a substrate with a predetermined temperature using the heat treatment mechanism, includes: a substrate and a Wheatstone bridge circuit which is disposed on the substrate and includes a plurality of temperature-measuring resistors whose resistance is varied depending on a change in temperature.11-01-2012
20100316086Online calibration of a temperature measurement point - A system for measuring temperature includes a thermowell, a primary temperature sensor, a reference sensor, and a transmitter. The thermowell has a measurement instrument connection and a side port. The primary temperature sensor extends into the thermowell through the measurement instrument connection, and the reference sensor extends into the thermowell through the side port. The transmitter is connected to each of the primary temperature sensor and the reference sensor. The transmitter has circuitry for measuring temperature based upon signals received from the primary temperature sensor and for concurrently calibrating based upon signals received from the reference sensor.12-16-2010
20130182741ONLINE CALIBRATION OF A TEMPERATURE MEASUREMENT POINT - A method for calibrating a transmitter with measurement circuitry electrically connected to first and second input terminals includes connecting a primary temperature sensor to the first input terminal and connecting a calibrated reference device to the second input terminal. The measurement circuitry is calibrated with respect to the first input terminal according to signals received from the second input terminal while measuring temperature according to signals received from the first input terminal.07-18-2013
20080317086Self-calibrating digital thermal sensors - Methods and apparatus relating to calibration of digital thermal sensors after manufacturing are described. In one embodiment, a temperature value sensed by a digital thermal sensor may be calibrated based on a temperature value sensed by a thermal diode. The thermal diode and the digital thermal sensor may be on the same integrated circuit chip. Other embodiments are also disclosed.12-25-2008
20130202008MONITORING CIRCUIT AND METHOD - A monitoring circuit for an integrated circuit comprises a non-temperature-inverted circuit and a temperature-inverted circuit. Operating parameters of the two circuits are measured, representing the propagation speed of signals in the respective circuits. In response to a change in temperature, the non-temperature-inverted circuit slows down and the temperature-inverted circuit speeds up. In contrast, in response to a change in operating voltage both circuits either speed up or slow down. This divergence in response to temperature and similar response to voltage enables the monitoring circuit to distinguish between changes in operating voltage and changes in operating temperature.08-08-2013
20130208758SENSING AND MONITORING APPARATUS - There is described a monitoring apparatus comprising at least three sensors capable of detecting a characteristic of a fluid, the sensors located within a fluid to be monitored; each sensor comprising a probe arranged to enclose a temperature sensing device; a power circuit including a first current source, a second current source and a third current source, the first current source connected to a first temperature sensing device, the second current source connected to a second temperature sensing device, the third current source connected to a third temperature sensing device, the first current source and the second current source arranged to power respective first and second temperature sensing devices so as to cause self heating of the first temperature sensing device and the second temperature sensing device to a first temperature; the third current source arranged to power the third temperature sensing device so as to cause a minimum self heating of the third sensing device to a second temperature; wherein the first temperature is a higher temperature relative to the second; a sensing circuit connected to each said sensor, each circuit comprising a member arranged to compare the voltage across a temperature sensing device and to output a signal indicative of a response of the probe of the temperature sensing device, a first comparator and a second comparator and a comparison circuit for comparing the response of the second temperature sensing device with the response of the first temperature sensing device and adapted to output a second compare signal, and an output circuit adapted to receive a test signal and comprising means for indicating the characteristics of the fluid to be monitored.08-15-2013

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