A method of monitoring a HVAC system to detect erroneous sensor installation. The method includes determining whether a circulation fan has been operational for a first predetermined time interval. If the circulation fan has been operational for the first predetermined time interval, determining whether a cooling demand is present. If the cooling demand is present, determining whether the HVAC system has been conditioning air for the first predetermined time interval responsive to the cooling demand. If the HVAC system has been conditioning the air for the first predetermined time interval, determining whether a difference between an indoor air temperature value corresponding to an enclosed space and an air temperature value from a discharge air temperature (DAT) sensor is greater than a predetermined temperature value. If the difference is not greater than the predetermined temperature value, forwarding a message indicating that the DAT sensor positioned within a duct of the HVAC system is improperly installed.

A method for operating a consumer appliance, as provided herein, may include detecting a preliminary first conversion value from a first sensor input pin electrically connected to an analog-to-digital converter (ADC) and detecting a preliminary second conversion value from a second sensor input pin electrically connected to the ADC in electrical parallel with the first sensor input pin. The method may further include determining a preliminary variation between the preliminary first and second conversion values is less than or equal to a predetermined preliminary threshold. The method may still further include activating a pull-up resistor in electrical communication with the first sensor input pin, identifying a fault state in response based on a conversion value variation following activating the pull-up resistor, and directing the appliance based on the determined fault state.

A system, method, and computer program product include a temperature determination control unit in communication with a monitored temperature sensor within an environment and one or more checking temperature sensors within the environment. The temperature determination control unit is configured to receive a monitored air temperature from the monitored temperature sensor. The temperature determination control unit is configured to receive a checking air temperature from the one or more checking temperature sensors. The temperature determination control unit is configured to compare the monitored air temperature with the checking air temperature. The temperature determination control unit is configured to determine an accuracy of the monitored air temperature based on a comparison of the monitored air temperature with the checking air temperature.

An apparatus acquires signals from thermal sensors on a probe and performs a first interpolation or a first extrapolation between temperatures determined from the signals based on the spatial locations of the thermal sensors to produce a temperature spatial distribution map, determines there is at least one malfunctioning thermal sensor, and assigns the malfunctioning thermal sensors a first arbitrary temperature and the correctly operating thermal sensors a second arbitrary temperature. The apparatus performs a second interpolation or a second extrapolation between the first arbitrary temperature and the second arbitrary temperatures based on the spatial locations of the thermal sensors so as to produce a spatial distribution of arbitrary temperatures, selects a section of the spatial distribution of arbitrary temperatures as having erroneous results to produce an error distribution map and superimposes graphically the error distribution map on the displayed temperature distribution map displayed on the screen.

A sensor assembly includes: a sensor module including a cylindrical portion into which a measurement target fluid is introduced and a diaphragm including a first surface in contact with the measurement target fluid and a second surface provided with a detector; a joint provided with a pressure introduction port for introducing the measurement target fluid to the sensor module; a cylindrical base member surrounding the sensor module; an electronic circuit attached to the base member to receive a detection signal outputted by the detector; and a temperature sensor electrically connected with the electronic circuit. The temperature sensor includes a temperature detector for detecting temperature, and a lead wire electrically connecting the temperature detector and the electronic circuit. The base member is provided with a receiver for receiving the temperature detector and the lead wire.

A method for testing a temperature measuring instrument is presented, where the instrument includes at least one sensor that changes its electrical resistance, and/or an electrical voltage that it produces, in response to being exposed to a change in temperature, and where the instrument is configured to be coupled to an object of interest. The method includes changing the temperature of at least one sensor by an amount that is detectable given the measurement resolution of the at least one sensor, by driving an electrical manipulation current through this sensor; obtaining one or measurement values from at least one sensor; and evaluating a state of the measuring instrument, a state of one or more of its sensors, and/or a state of a coupling to an object of interest, from the one or more measurement values.

Disclosed is a system for detecting uncertainty in temperature detection systems. The system includes a temperature sensor including a ground sheath and a central conductor surrounded by the ground sheath, the ground sheath and the central conductor being electrically coupled to one another through a temperature dependent resistive element. The system includes a controller connected to the temperature sensor and adapted to detect an electrical parameter of the temperature dependent resistive element, the controller operable upon execution to output an uncertainty indication when the electrical parameter of the temperature dependent resistive element is not within an expected value range based on an aircraft status indication, a historical value of the electrical parameter, and the electrical parameter.

A fire or overheat detection device includes a diaphragm adjacent to a chamber with a gas inside the chamber, wherein the diaphragm contacts the gas. The fire or overheat detection system also includes a Fabry-Perot interferometer. At least a portion of the Fabry-Perot interferometer is coupled to the diaphragm via a linkage. A light source is configured to direct an input light into the Fabry-Perot interferometer.

A method for operating a consumer appliance, as provided herein, may include detecting a preliminary first conversion value from a first sensor input pin electrically connected to an analog-to-digital converter (ADC) and detecting a preliminary second conversion value from a second sensor input pin electrically connected to the ADC in electrical parallel with the first sensor input pin. The method may further include determining a preliminary variation between the preliminary first and second conversion values is less than or equal to a predetermined preliminary threshold. The method may still further include activating a pull-up resistor in electrical communication with the first sensor input pin, identifying a fault state in response based on a conversion value variation following activating the pull-up resistor, and directing the appliance based on the determined fault state.

Systems and methods are provided to detect a failed thermocouple. A temperature in a gas path of a gas turbine engine may be measured, where the temperature is based on a signal generated by a thermocouple during a startup of the gas turbine engine and/or during an idle period that immediately follows the startup, and the thermocouple protrudes into the gas path. A failure of the thermocouple may be detected if the temperature is determined to be less than a threshold temperature.