Abstract: Disclosed herein, among other things, is a stator winding temperature sensor. According to an embodiment, the sensor includes at least one sensing wire coil adapted to be connected to a stator. The sensor also includes a body, including a core material surrounding at least a portion of the sensing wire coil, and a laminate material over the core material. The body has a thickness adapted to protect the sensing wire coil. The sensor includes a lead wire adapted to connect to an external monitoring device. The sensing wire coil is electrically connected to the lead wire at a lead step portion of the sensor. In addition, the sensor includes a tab extending from the lead wire and encompassing the lead step. The tab protects the lead step and the sensing wire coil in a region where the sensor extends over an end of the stator.

Abstract: The invention relates to an overheat detection sensor. The inventive sensor is characterised in that it comprises a conductive core which extends inside a first conductive sheath, said core and first sheath being separated by a material having a positive or negative temperature coefficient The detector also comprises a wire which is made from a material having a positive or negative temperature coefficient. Said wire extends around the first sheath and is separated from same by means of an insulating material. The central core, the first sheath and the wire are all connected to connection means.

Abstract: An end seal for a temperature sensing probe. Electrical interface wiring is passed through a restraining element and is operatively coupled to a temperature sensing element or heater element mounted in the sheath. The sheath is formed around the restraining element in a shape that provides a net force inward as temperature variations expand and contract the restraining element.

Abstract: A temperature sensor. The sensor comprises a wire comprising a resistance temperature detector (RTD) sensing material wrapped around a flexible insulated metal core wire to form an assembly. A first end of the sensing wire is electrically connected to a first end of the core wire. The second end of the core wire provides a first lead, and an insulated lead wire is electrically connected to a second end of the sensing wire to provide a second lead. Shrink tubing encapsulates the assembly.

Abstract: A liquid crystal display (LCD) includes an LCD panel providing a surface. A flexible heating system of the invention includes a substantially transparent flexible sheet substrate disposed adjacent the surface of the LCD panel and a substantially transparent resistive heating element formed on the flexible sheet substrate. One or more serpentine shaped thermal sensors are formed in the resistive heating element. Control circuitry coupled to the serpentine shaped thermal sensors and to the substantially transparent resistive heating element and other heaters controls the heating element and other heaters based resistances of the serpentine shaped thermal sensors.

Abstract: A fire event detection system includes a programmable logic circuit which evaluates electrical resistance input data and energizes an alarm upon programmed conditions. The system includes a temperature sensitive polymeric tape spanning between a pair of conductors connected to the circuit. The conductors and tape define a plurality of notches for redirecting current transversely across the tape between the for enhancing responsiveness to a temperature increase at a particular location along the tape. The circuit energizes the alarm if the resistance data indicates a temperature greater than a predetermined critical temperature parameter or if the data indicates a temperature rate of rise greater than a critical rate of rise parameter. The tape may include notched and unnotched portions such that the circuit energizes the alarm if the rate of rise at a particular location is greater than the rate of rise of the tape as a whole.

Abstract: An overheat event location module for use with an existing overheat detection system in an aircraft. The module is non-intrusively connected to the overheat detection system, yet senses currents in the system. The module, by way of the sensed currents is able to distinguish true overheat events from false events (normally created in a test mode) and normal non-overheat conditions. The module is able to respond to the occurrence of an overheat event by measuring the currents in the sensing cable loop, then using the measured currents to produce an estimate of the position in the loop at which the overheat event occurred. Conveniently the module records both the fact of the event and its location, such that subsequent maintenance actions are facilitated.

Abstract: A plastic thermistor comprising a polyamide composition which comprises 100 wt. parts of a polyamide and 5.3 to 30 wt. parts of zinc iodide, or a polyamide composition which comprises a polyamide, an iodine-containing compound, and a metal oxide such as zinc oxide. Ion carrier properties of a metal iodide greatly increases temperature dependence of impedance, and the metal oxide such as zinc iodide functions as a receptor for iodide ions and prevents the formation of a metal iodide on the surfaces of metal electrodes. Furthermore, a linked cycle can be established that zinc oxide forms zinc iodide and then formed zinc iodide functions to increase the stability of half-wave current passage. Accordingly, the thermal stability of the plastic thermistor is improved for a long time, and the heat resistance stability of temperature sensors or thermosensitive heaters comprising the plastic thermistor is improved greatly.

Abstract: Apparatus for providing a temperature profile of the ocean for a towed so array. A towing cable for the array comprises a central cable and a protective outer jacket. Thermistors are disposed at spaced positions along the outer jacket and connect to conductors embedded in the protective outer jacket. The conductors terminate onboard ship to provide continuous signals representing temperatures at various ocean depths.

Abstract: In the case where a heater main body (1) is bent so as to be wound around a subject to be heated such as a water pipe, etc., a heater can stably heats the subject to be heated. A plurality of heating elements (2), which are composed of ceramics as positive-characteristic thermistors and have electrodes on both sides of the heating elements, are sealed along a lengthwise direction of the heater main body (1) with flexibility and electrical insulation at intervals. Pairs of feeders (3) for feeding electricity to the heating elements (2) are provided to the heater main body (1). A holder (5) having electrical conductivity is provided into the heater main body (1) so as to connect the heating elements (2) to the feeders (3) and retain them. The holder (5) reduces faulty electrical connection between the feeders (3) and the heating elements (2), and thus the heat generation by the heating elements (2) can be stabilized.

Abstract: A resistance temperature detector (RTD) unit includes an RTD assembly that is removably supported in a central chamber of a support assembly. In a preferred arrangement, the RTD assembly and the central chamber are arc shaped to facilitate removal from the support assembly and to maintain contact surface area. By providing a removable RTD assembly, costs are reduced over current RTD assemblies including two monitoring elements, and the RTD elements can be replaced without dismantling the top bar connections.

Abstract: An electric motor protector sensor contains a small thermistor of low thermal inertia contained in a high temperature dielectric covering member in which electrical insulated lead wires are connected to opposite sides of the thermistor and extend out of the cover member to a current source to supply electrical current to the thermistor. An electrically insulating, thermally conductive silicone elastomer is positioned around the thermistor and lead wires to absorb forces on the sensor thereby protecting electrical contact between the lead wires and damage to the thermistor. Additionally, the lead wires can be twisted as extending out of the cover member and covered with another sleeve covering to provide improved protection against lead wire separation from thermistor surface electrical contact.

Abstract: A continuous temperature sensing cable formed of a polymer containing conductive and semi-conductive fillers such as polyethylene with carbon black, powdered metals and metal oxides. The composition is extruded over a pair of elongated substantially parallel conductors which are spaced apart along the longitudinal length of the cable. The conductors are single-endedly connected to a control/alarm device for monitoring the continuous length of the temperature sensing cable. A critical voltage is applied single-endedly to the conductors and serially connected to an audible alarm to detect tunneling conduction when operated at a temperature near the melt temperature of the composition whereat the composition exhibits a negative temperature coefficient (NTC).

Abstract: An elongate resistive sensor useful as an element of a pneumatic manifold failure detecting and locating system. A sensing loop is based on a coaxial cable having a core of known resistance per unit length. A eutectic salt impregnated insulant separates the core and sheath but has a temperature breakdown characteristic which provides the sensing function. Upon a pneumatic manifold failure, the sensing cable is heated, the eutectic salt insulator breaks down, a core-to-sheath short occurs, and currents in the sensing cable are substantially altered as a result. The cable is connected as a loop, and differential currents into the ends of the loop are detected and processed to determine the position of the short. Terminating resistors are associated with connectors which connect multiple cable sections into a single loop, and the terminating impedance is further sensed to determine an open circuit condition at any connector.

Abstract: An electrically heated vacuum furnace is provided with special lead-through devices for transmitting current to the heating elements. In order to recognize gas discharges which can occur between a lead-through and a tank wall, the insulation of the lead-through is surrounded by an auxiliary electrode. A thermocouple can also be used instead of an auxiliary electrode. A signal derived from the auxiliary electrode can be used to shut off the furnace power to avoid damage thereto.

Abstract: A continuous temperature sensing cable formed of a polymer containing conductive and semi-conductive fillers such as polyethylene with carbon black, powdered metals and metal oxides controlled within the range of from about eight percent (8%) to about fifteen percent (15%). The composition is extruded with a pair of elongated substantially parallel conductors which are spaced apart along the longitudinal length of the cable. The conductors are single endedly connected to a control/alarm device for monitoring the continuous length of the temperature sensing cable. The control/alarm device may be a time domain reflectometer TDR for accurate determination of localized discontinuities caused by high temperatures along the length of the temperature sensing cable. Alternatively, a critical voltage may be applied single-endedly to the conductors and serially connected to an audible alarm to detect tunneling conduction when operated at a temperature near the melt temperature of the composition.

Abstract: Disclosed is a fire detection and engine monitoring system of the type which utilizes a pair of elongated thermistor strands extending over substantially the same path to provide redundancy. A resistance of the two thermistor strands are sensed and a resistance difference signal is generated. The resistance signal is monitored for abnormal differences between the two identical thermistor devices which are essentially exposed to the same operation conditions. Such differences are indicative of the deterioration over time of the condition of one of the sensors.

Abstract: A musical candle includes a longitudinal thermistor strip emedded in a candle juxtapositional and proximate to a wick which thermistor can sensitively actuated when burning or extinguishing the candle for starting or stopping sounding of a musical device mounted in a casing for holding the candle on the casing.

Abstract: A multiple point remote temperature sensing system includes a cable having temperature responsive segments as spaced along the length of the cable and being integral therewith. Each of the temperature responsive segments includes a temperature measuring device and a circuit which establishes a unique address for the segment whereby the local ambient temperature at each segment may be interrogated from a remote location.

Abstract: A strain-resistant resistance temperature element for a temperature averaging sensor and apparatus for producing same. Highly sensitive thin metal wire, typically of platinum, is attached to both sides of a high temperature, pliable yet stretch/strain resistant tape. A somewhat wider tape of similar description is then applied to both sides of the tape containing the sensor wire. As a result, a highly pliable, yet stretch/strain resistant resistance temperature detector is provided. The major advantages of the invention being that the resistance temperature detector (RTD) of the instant invention is provided substantial strain relief and, therefore, will overcome the problems of prior art sensors, which broke 100% of the time after a minimal period of use. Further, the RTD of the present invention may be pulled through the plastic tubing used to shelter the RTDs from the material being measured, without fear of breaking.

Abstract: A method for monitoring temperature in an enclosed space, especially a means of transportation such as an aircraft is disclosed. The method uses a wire or cable which has, between an inner conductor and an outer conductor, an element made of a material, the resistivity and dielectric permittivity of which vary with temperature. At one end of the cable, a check is made on the product RC of the resistance and the capacitance between the central conductor and the outer conductor.

Abstract: A thermal protector using a polymeric PTC element, with broad upper and lower surfaces, sandwiched between and held in intimate mechanical and electrical contact over substantially its entire broad surfaces with inner broad surfaces of upper and lower plate-terminals. Electrical insulation between the upper and lower plate-terminals outside the areas of contact of the plate-terminals and the PTC element electrically insulates the upper and lower plate-terminals from one another. The plate-terminals are clamped mechanically, preferably in such a way that the PTC element is biased continuously against the broad surfaces of the plate-terminals.

Abstract: A heat sensitive cable operable over a temperature range of between approximately -20.degree. F. and 1650.degree. F. The cable includes a tubular metallic sheath which is substantially temperature resistant and moisture impervious. It also includes a mass of compacted insulation material filling the sheath and having an insulation resistance variable with temperature in the range of between approximately 100 and 50,000 ohms. The cable further includes at least one thermoelectric conductor positioned within the insulation material filling the sheath. A method of manufacturing the cable includes the step of preparing the insulation material and advancing the thermoelectric conductor through a given region. It also includes the step of advancing a strip of flat metal material past apparatus for forming and welding a tubular sheath surrounding the given region.

Abstract: A fire detector is provided with an electric insulator consisting of short segments of preferably a ceramic pipe disposed end-to-end within the space between an inside cylindrical electrode and cylindrical outside electrode. The inside electrode together with the insulator segments are covered with a thin salt-based layer and are disposed in the interior of the outside electrode so that between the insulator segments and the internal wall of the outside electrode an air space is formed along the length of the detector, whereby the insulator segments each provide a point-type contact between the internal wall of the outside electrode and the thin salt-based layer.

Abstract: A heat sensitive cable operable over a temperature range of between approximately -20.degree. F. and 1650.degree. F. The cable includes a tubular metallic sheath which is substantially temperature resistant and moisture impervious. It also includes a mass of compacted insulation material filling the sheath and having an insulation resistance variable with temperature in the range of between approximately 100 and 50,000 ohms. The cable further includes at least one thermoelectric conductor positioned within the insulation material filling the sheath. A method of manufacturing the cable includes the step of preparing the insulation material and advancing the thermoelectric conductor through a given region. It also includes the step of advancing a strip of flat metal material past apparatus for forming and welding a tubular sheath surrounding the given region.

Abstract: A temperature threshold detector (10) comprises a first electrical conductor (11) and a second electrical conductor (12), which are separated by a spacing structure (13). The first and second electrical conductors (11 and 12) are made of metals that are dissimilar from each other in terms of oxidation potentials or thermally generated electromotive force. The spacing structure (13) is made of a material whose electrical resistivity is temperature dependent so that, when exposed to a temperature below a predetermined threshold value, the spacing structure (13) provides electrical isolation between the first and second electrical conductors (11 and 12). However, when exposed to a temperature above the predetermined threshold value, the spacing structure (13) enables an electromotive force to develop across the first and second conductors (11 and 12). This electromotive force is indicative of temperature rise above the predetermined threshold.

Abstract: A multipurpose in situ underground measurement system comprising a plurality of long electrical resistance elements in the form of rigid reinforcing bars, each having an open loop "hairpin" configuration of shorter length than the other resistance elements. The resistance elements are arranged in pairs in a unitized structure, and grouted in place in the underground volume. The electrical resistance of each element and the difference in electrical resistance of the paired elements are obtained, which difference values may be used in analytical methods involving resistance as a function of temperature. A scanner sequentially connects the resistance-measuring apparatus to each individual pair of elements. A source of heating current is also selectively connectable for heating the elements to an initial predetermined temperature prior to electrical resistance measurements when used as an anemometer.

Abstract: The invention is an over-temperature sensor and locator utilizing a temperature sensitive cable comprising (1) an electrical conductor, (2) a dielectric, and (3) a solid, conductive polymeric, positive temperature coefficient of resistance composition. An over-temperature condition at any point along the cable is detected by a drop in the capacitance of the cable, as measured from one end of the cable. The location of the over-temperature point on the cable is determined by comparing the reduced capacitance from the control end to the over-temperature point with the capacitance of the full cable length.

Abstract: This invention relates to devices for measuring temperature; more particularly it relates to temperature sensing devices operating at high temperature. It is an object of this invention to overcome deterioration of temperature sensitive elements and accordingly the element of the invention comprises a substrate made from an electrically non-conducting material and carrying an electrically conducting path comprising a vitreous phase which is resistant to chemical reduction and loaded with electrically conducting particles.

Abstract: A flexible cable type of linear thermal array is constructed of a bundle of nsulated conductor pairs enclosed in a braided aramid fiber strength layer through which individual pairs are withdrawn at intended thermistor stations and the end portions thereof loosely caged in the lumens of thermoplastic tubes. After an outer layer of thermoplastic fiber is braided over the bundle and tubes openings are formed through the outer layer and tubes, the wire end portions withdrawn, thermistors connected thereto and reinserted in the tube lumens.

Abstract: A fire, temperature or heat detection system is disclosed which comprises a cable having at least two conductors separated by insulation whose electrical characteristics vary with temperature, and means connected to the conductors of the cable for detecting variations in the electrical characteristics of the insulation.

Abstract: A tape cord thermometer in which a disposable tape acts as the conducting means between a thermometer probe and a reading device.