Abstract: A method for measuring a temperature outside a housing unit includes the steps of measuring a first temperature inside the sealed housing of the housing unit, measuring a second temperature inside the sealed housing of the housing unit, and measuring a airflow speed outside the housing of the housing unit and along the front cover of the housing. A multiple of the difference between the first temperature and the second temperature is added to the first temperature, and a multiple of the product of airflow speed ¦vA¦ and the difference between the first temperature and the second temperature is further added.

Abstract: A light source comprising a light emitter; a heat sink coupled to the light emitter; and a temperature sensor substantially adjacent to the light emitter. A first thermal time constant associated with the temperature sensor is less than a second thermal time constant associated with a radiation surface of the heat sink.

Abstract: A heating cooking device includes a temperature sensing element that contacts a bottom surface of a top plate directly or indirectly and measures a temperature of the top plate, a spring portion one end side of which is supported by a heater unit and the other end side of which presses the temperature sensing element against the top plate, and a spring that presses the heater unit toward the top plate. An elastic force n1 with which the spring portion presses the temperature sensing element against the top plate is smaller than an elastic force n2 with which the spring presses the heater unit toward the top plate.

Abstract: A power socket having a reed to activate an alarm is constituted by a lower casing, an upper casing, and a conduction terminal which is inserted between the lower casing and the upper casing. The conduction terminal is provided with a dual-metal complex reed, and an interior of the lower casing is provided with a conduction piece for energizing an alarm device. Accordingly, when the conduction terminal reaches a certain high temperature, the dual-metal complex reed is buckled and deformed in accordance with its metallic properties, and is connected with the conduction piece, so as to activate the alarm device to give off sound or illuminate, thereby achieving a function of safety protection by alerting a user to pay attention to.

Abstract: A power socket having a reed to activate an alarm is constituted by a lower casing, an upper casing, and a conduction terminal which is inserted between the lower casing and the upper casing. The conduction terminal is provided with a dual-metal complex reed, and an interior of the lower casing is provided with a conduction piece for energizing an alarm device. Accordingly, when the conduction terminal reaches a certain high temperature, the dual-metal complex reed is buckled and deformed in accordance with its metallic properties, and is connected with the conduction piece, so as to activate the alarm device to give off sound or illuminate, thereby achieving a function of safety protection by alerting a user to pay attention to.

Abstract: An apparatus for monitoring a temperature of a structure, comprising: one or more electrically conductive loops adapted to be affixed to the structure, each including first and second elongate connection strips each made of a first metal composition having a first melting point, and a temperature sensitive band connected between the first and second connection strips and made of a second metal composition having a second melting point less than the first melting point. The apparatus further comprises a monitor, connected to respective ends of the first and second connection strips spaced-apart from the temperature sensitive band, configured to detect an open-circuit in the one or more electrically conductive loops caused when the temperature sensitive band separates from either of the connection strips.

Abstract: The present invention provides a remote detection device including a conventional measurement device, such as a thermostat, having an internal contact which is wired in series with a resistor and two wires of a standard telephone line. When the measurement device reaches or surpasses a predetermined set value, such as a predetermined temperature, the measurement device will close the internal contact such that the resistor will short the telephone line. Accordingly, when the ambient condition has reached or surpassed the predetermined set value, the owner or manager of a building will receive a busy signal when dialing a telephone line connected to the remote detection device. In another embodiment the remote detection device may comprise a computer program component which periodically monitors the status of a communication line connected to the measurement device at the remote location.

Abstract: A method for fluid pressure analytical electronic heat and fire detection, and a corresponding heat detector, used for detecting heat and fire, having no moving component, such as a valve, switch, membrane, diaphragm, or similar actuatable device of moving parts, for effecting activation of a warning or alarm signal indicating a condition of excessive heat or fire. The analytical electronic heat detection mechanism is based on electronic circuitry including at least one fluid pressure transducer, logic, and other cooperatively functioning electronic components, for highly accurately and reproducibly, first analyzing a potential condition, and then logically determining, an actual condition of excessive heat or fire. The electronic heat detection mechanism is fully functional, by having at least one fluid chamber closed to any external source of fluid pressure. The invention includes an automatic electronic testing procedure for naturally stimulating the heat detection mechanism for effecting operation.

Abstract: A device for measuring and signaling the internal temperature of a container. The device includes an energy source, an informing device electrically connected to the energy source, and a bimetallic element electrically connected to the energy source. The bimetallic element is configured to deform based upon a variation in the internal temperature of the container. The device further includes a selector configured to provide for the selection of a predetermined temperature valve and having a conductive portion electrically connected to the informing device. The bimetallic element is configured to contact the conductive portion when the internal temperature of the container reaches the predetermined temperature value, thereby creating a closed electrical loop that actuates the informing device.

Abstract: A heat alarm for an electric panel cabinet that mounts a temperature sensor within the enclosed area defined by the cabinet and sounds an alarm if the temperature within the cabinet exceeds an upper temperature limit. The heat alarm includes a microprocessor that operates an audible alarm upon sensing an overheat condition. After operating the audible alarm for a continuous period of time, the microprocessor operates the audio alarm in a series of sound pulses separated by a silence interval. The silence interval increases as the continuous period during which the temperature in the electric panel exceeds the upper temperature limit increases. The heat alarm includes a manually operable alarm override device that can be depressed to deactivate the audible alarm for an override period to allow the home/business owner to address the overheat condition within the electric panel cabinet, without the distraction of the audible alarm.

Abstract: An heat alarm for an electric panel cabinet mounts a heat sensor within the enclosed area defined by the electric panel cabinet to monitor the temperature within the cabinet and sound an alarm if the temperature in the cabinet exceeds an upper temperature limit. The heat alarm includes a mounting arrangement positioned between the enclosure of the heat alarm and the electric panel cabinet such that the heat alarm can be mounted to the electric panel cabinet and the heat sensor positioned within the cabinet. The mounting arrangement of the heat alarm is formed of a thermally non-conductive material such that the enclosure containing the heat alarm is thermally isolated form the electric panel cabinet such that the enclosure of the heat alarm does not affect the temperature within the cabinet.

Abstract: A heat detection and alarm unit is provided including a housing with a front face, a rear face, a top face, a bottom face and a pair of side faces coupled therebetween defining an interior space. A speaker is situated within the interior space of the housing. The speaker is adapted to emit an audible tone upon the supply of power thereto. A coiled thermostat is provided having a first end located at the center thereof rotatably coupled within the interior space of the housing. The coiled thermostat has a second end with a conductive hammer coupled thereto. Next provided is a battery mounted within the housing for powering purposes. An electrical assembly including a contact is mounted adjacent the conductive hammer. Upon the detection of a predetermined temperature, the hammer engages the contact thereby supplying power to the speaker.

Abstract: A fire detection system includes an elongated liquid filled tube with a fluid coupled alarm switch, with a flexible diaphragm which senses a change from the liquid to vapor phase in the presence of an overheat or fire condition to provide an alarm. To prevent false alarms due to normal expansion of the liquid under changing ambient temperature conditions, a compensator is provided which in one form is a pair of mechanically coupled bellow type containers, filled with the same liquid which will expand at the same rate as the fluid under normal ambient temperature conditions but in a fire condition will resist faster expansion thus causing the alarm switch to be actuated. In another embodiment, a bimetallic bellows is utilized to match the liquid expansion but resist greater vapor pressure. Yet in another embodiment the change in liquid flow rate due to a fire condition is sensed to prevent further accommodation to the normal increase in volume of the liquid.

Abstract: A temperature compensating low pressure sensor for verifying loss of gas from an inflator of a vehicle restraint safety system. The sensor includes a housing and a pressure diaphragm in communication with the fluid in the inflator. A temperature sensitive bimetallic thermostat is disposed within the housing. The thermostat expands with relation to a change in temperature of the fluid at the same rate as the pressure diaphragm. A retainer in communication with the pressure diaphragm is movably disposed in the housing. A stack of spring washers is disposed between the retainer and the thermostat for counteracting the pressure of the fluid acting upon the diaphragm. A contact arm in contact with the thermostat moves with the retainer.

Abstract: A fire alarm for an electric panel cabinet mounts a temperature sensor to monitor the internal cabinet temperature and sound an alarm if the inside of the cabinet becomes too hot. The alarm device preferably has an auxiliary battery power supply in case overheating within the cabinet causes a power failure. The alarm can be mounted remotely from the panel cabinet or directly, preferably by a threaded conduit nipple secured to an alarm enclosure box and mounted within a knockout opening in the panel wall.

Abstract: A thermometer housing of a generally cylindrical configuration is arranged for floating reception within a bathtub, with the thermometer housing including a top wall divided into a first and second semi-annular indicator surface, with an indicator arrow operative through a bi-metallic spring arranged for deflection from the first to the second indicator surface upon bathtub water elevated to a second zone of temperature to be classified as inappropriate for bathing. A stabilizer weight member is mounted to the bottom wall to maintain alignment and emergence of the housing side wall within the associated bathtub body of water.

Abstract: The present invention relates to a temperature measuring device including an alarm contact, in particular for motor vehicles, the device comprising a housing (10) which receives a bimetallic strip (20) and a thermoresistive element (150). According to the invention, a support (100) of electrically insulating material is provided to carry a contact stud (160), a contact blade (170), the thermoresistive element (150) interposed between the contact stud (160) and the contact blade (170), and a spring element (180), all in the form of a unitary module.

Abstract: A method and apparatus for advance warning signaling to a motorist of an ice condition on a driving surface. The method steps include mounting a plurality of traffic signalling devices along a driving surface for sensing the prevailing temperatures and thereby continuously signal a motor vehicle operator of the changes in temperature as he approaches a driving surface subject to freezing to permit him to take any necessary precautionary corrective action in driving the motor vehicle. The signalling devices utilize thermostat elements for sensing a narrow temperature range adjacent the freezing temperature and provide visible signals, preferably two colors for signalling a warm or nonhazardous temperature, a cold temperature signalling a frozen driving surface or a combination or mixture of the colored signals to permit the motor vehicle operator to be warned, in advance, as he approaches a driving surface that is becoming colder, leading to a stretch of a driving surface that may be frozen.

Abstract: A warning apparatus alerts a home owner to unsafe temperatures in the stove pipe of a wood- or coal-burning stove by signaling an alarm if the pipe gets too hot, thereby providing a warning against a potential fire hazard that can be caused by creosote build-up.

Abstract: A self-contained electrical warning device for attachment to a wood furnace. Includes a heat sensitive switch, a momentary test switch, a set of batteries, and an alarm. When the furnace reaches a dangerously high temperature, the heat sensitive switch is tripped and the alarm sounds warning the person using the furnace.

Abstract: A temperature alarm is disclosed for attachment around the exterior of the flue pipe of a wood-burning or similar stove, with alarm activation temperature selected by slidable adjustment along the flue pipe. A bimetal thermostat is mounted in close proximity to the flue pipe, and acts to close an electrical connection between thermally protected power supply and acoustic horn. A system test circuit is provided.

Abstract: A temperature alarm includes a thermostat for actuating an audible alarm, a control panel-mounted LED and a circuit board-mounted LED. The audible alarm, once actuated by the thermostat, can be temporarily disabled by the user by actuating a disable timer connected to the audible alarm. After a period of time the timer times out to return control of the audible alarm to the thermostat. The panel LED is illuminated continuously while the chosen temperature value is exceeded. The circuit board LED is mounted to a circuit board within the equipment housing. Once illuminated by the thermostat, the circuit board LED remains actuated regardless of the temperature to provide an indication to a service technician that the chosen temperature was exceeded since the last servicing. The circuit board-LED, coupled to a latching relay also mounted to the circuit board, is extinguished by manually resetting the latching relay.

Abstract: An alarm device has a housing provided with visual and audio alarm indicators which give a warning when the temperature of a particular location is at a predetermined relatively low temperature to prevent freezing and wherein a modification is provided which has a switch that activates an enhanced audio alarm responsive to a predetermined temperature lower than the first referred to temperature.

Abstract: A lubricating oil supply system has a pump for automatically supplying lubricating oil from an oil tank to a crankcase of an engine through a passage. A bimetallic strip is cantilevered on a wall of the passage. The bimetallic strip is provided so as to reduce the cross-sectional area of the passage at the bimetallic strip when the temperature of the strip rises and to increase the cross-sectional area when the temperature lowers.

Abstract: A console having annunciator lights and a cigar lighter receptacle compatible telescoping plug is mounted in the cigar lighter receptacle of an automobile. The plug is inserted in the receptacle using the console as a handle and telescopes within the console until the console abuts the dash board. Temperature sensing switch elements contained in an encapsulating capsule are connected by conductors to the lights and the receptacle power connections. The capsule is inserted in the transmission dip stick tube and the conductors pass through an existing opening in the fire wall.

Abstract: A device for indicating that a sensed temperature has reached a certain selected level and method of making the same are provided, the device comprising a housing carrying an electrical switch unit for operating an indicator to one condition thereof when the switch unit is closed and to another condition thereof when the switch unit is open. The switch unit comprises a first movable contact unit and a second movable contact unit which when in contact with each other close the switch unit and when out of contact with each other open the switch unit. The first contact unit is moved relative to the second contact unit in relation to the sensed temperature. A selector unit is rotatably carried by the housing for selecting the certain level and has a setting portion operatively interconnected to the second contact unit to position the same relative to the first contact unit in relation to the selected level.

Abstract: A C-shaped failure detector for steam traps includes a curved temperature sensitive bi-metal strip positionable against the external surface of a steam or condensate pipe, and two thermally insulative arms, one extending from each end of the strip. The contiguous surface area between the bi-metal strip and pipe varies with the pipe surface temperature, resulting in an amplified response, both in expansion and contraction. A threaded rod is pivotally mounted to one of the arms, and a sleeve threadedly engages the free end of the rod and extends freely through an opening in the other arm. The sleeve is rotated on the rod to selectively position the sleeve with respect to the second arm. The arms move angularly toward or away from each other responsive to temperature changes in the bi-metal strip.

Abstract: A housing for attachment to a space heating appliance and having a terminal assembly receiving a two conductor plug. The terminal assembly is positionable arcuately on the housing and includes a contact closed upon expansion of a bimetallic coil. The coil additionally drives a temperature indicator. A signal generator unit is remote from the first mentioned housing and is in circuit therewith via a two conductor cable.

Abstract: A movable permanent magnet (38) is moved by a rotating rig (29, 30) driven by a spiral thermometer (27). This magnet is designed to activate an interrupter (43) of an electric circuit housed in a sonic detecting-warning device (44) capable of rotating on the periphery of a housing 11. The circuit also comprises a battery (45) and a buzzer (46). When the magnet (38) rotates past the interrupter (43) it causes the interrupter to close, thereby actuating the buzzer (46). The angular position of the detector (44) is selected according to the temperature at which the warning signal is to be given.

Abstract: A portable room security alarm features a smoke detector alarm, a motion sensing intrusion alarm, a temperature sensing alarm, and a digital display alarm clock. The security alarm includes a deployable thermally conducting mounting clip for mounting the alarm at the top of a door with the clip extended to pass around the upper edge of the door. A deployable temperature sensor probe may be attached to the clip to give early warning of a fire outside the door. The temperature probe may alternatively be attached to other metallic structures passing through the door frame, e.g. door knobs, hinges, etc. Large ventilating apertures in an extensible telescoping housing allow access of smoke to the smoke sensor, and with the housing closed the sensor is sealed off against long term contamination.

Abstract: An electronic system for a high amperage molded case circuit breaker employing a voltage to frequency converter circuit for transforming fault current levels to a number of pulses corresponding to the fault level. The pulses are applied to a long time delay and short time delay circuit respectively which integrates the pulses to provide an output in a time period inversely proportional to the fault level. The long time circuit is provided with a second stage activated for a selected time by each output of the respective first stage to further count the pulses and provide a long time delay output in a time period inversely proportional to the square of the fault current. A variable resistance power supply provides a fixed voltage drop across the current transformer output to facilitate changes in breaker rating with a simple rating resistor change. A bimetal switch is also employed to sense the temperature adjacent the breaker contacts.

Abstract: A contact-controlled capacitive switching means utilized as a floor or cabin calling transmitter for lifts or the like is designed such that travel or drive commands for the lift are prevented from being generated by the action of heat or, if generated, from being further transmitted to a lift control system. Therefore, a thermal circuit breaker is interconnected between an actuating element, such as a contact button and a coupling member connected to an input of an oscillator. The thermal circuit breaker may be mounted directly at the contact button or at a mounting plate carrying the contact button. A further thermal circuit breaker is interconnected between an output of the switching means and a connection terminal of a signal transmitting line of the lift control system.

Abstract: A temperature increase or excursion sensor and locator consisting of a temperature sensitive cable which includes three electrical conductors, two conductors are separated by a dielectric member to form a linear strip capacitor and one of the two conductors has a number of thermostatic devices connected serially. Over or under temperature excursions are sensed and located by the cable when it is connected to control electronics by detecting the continuity and by measuring the capacitance of the cable. Under normal conditions, all of the thermostatic devices are electrically conducting and the control electronics measures the full capacitance from both ends of the cable and detects continuity over the full length of the cable. Upon a temperature increase or an excursion, one or more thermostatic devices become non-conductive, creating a discontinuity in one of the conductors and in addition the resulting capacitance is proportionately reduced.

Abstract: The temperature indicator has a temperature sensor which operates a switch. The temperature sensor is exposed to the heat of both the heating system of the glass ceramic cooking surface and an auxiliary heating system. The switch opens and closes a circuit including an indicating member indicating the state of the cooking surface. To ensure that the temperature indicator operates with maximum precision the switch is positioned outside the heated area and the temperature indicator is thermally closely coupled to the heating system of the glass ceramic cooking surface and/or the glass ceramic cooking surface itself. Thus, in all operating states its cooling time is the same as the cooling time of the glass ceramic cooking surface.

Abstract: A fire alarm device has, in a main body, a fire detection means and alarm means controllable by a detection signal from the fire detection means. The fire alarm device, which being independent in itself is installed on a ceiling or wall where the fire can be easily detected and produces an acoustic alarm as soon as the fire is detected. The detection element of the fire detection means is provided in front of a speaker for producing the acoustic alarm. Since the heat due to the fire is concentrated in front of the speaker, the detection element can react quickly.

Abstract: A temperature excursion sensor and locator consisting of a temperature sensitive cable which includes two electrical conductors separated by a dielectric member to form a linear strip capacitor wherein at least one of the conductors is comprised of a number of thermostatic devices connected serially. An over or under temperature excursion is sensed and located by the cable when it is connected from either end to control electronics by measuring the capacitance of the cable. Under normal conditions, all of the thermostatic devices are electrically conducting and the control electronics measures the full capacitance. Upon occurrence of a temperature excursion, one or more thermostatic devices become non-conductive and the resulting measured capacitance is proportionately reduced.

Abstract: An extremely sensitive portable thermo-anemometer comprises: (1) a matched pair of preformed bimetallic cantilevers which are arranged symmetrically to face and bend toward each other upon a temperature change and which also functions as a vibrating contact switch, current path and heat sink; (2) mechanically combined actions, of a thumbwheel, a lead screw and a rider, which provide an accurate means of controlling, balancing, and indicating the separation of the two tips in opposition to the thermally induced bending force with screw and wedge action; (3) a contact indicating system having a LED lamp and power supply; and (4) a casing which houses the working components and supports their functions.

Abstract: Conventional warning installations possess electrically interrogated feelers or sensors or generate electrical signals, particularly if they are used for remote monitoring purposes. At the feelers and even more so at the signal lines it is possible for there to be produced spurious signals due to electrostatic charges or electrical or magnetic induction. These spurious signals trip unwarranted warning or alarm signals. The novel warning or alarm installation therefore contains an optical conductor or guide as a signal line, and the feelers are interrogated by means of optical signals. The optical conductor together with an electronic monitoring circuit forms a free-running opto-electronic oscillator which comes to standstill when there is interrupted the oscillating optical signal which is irradiated into the optical conductor and radiated back out of the conductor into the circuit.

Abstract: An alarm device which includes a housing, batteries in the housing, conductors and a light source and an audio signal in parallel to one another and connected to the batteries and switch means between the light source and the audio signal, in series therewith, and normally opened, yet adapted to be closed by movement of the switch to cause, optionally, a light or an audio signal and, alternatively, an attachment for the housing to provide an alternative circuit with a switch in it which is activated by heat, or by closing to a normal position upon release under predetermined conditions to override the signal and to cause an audio signal to warn a person that an intruder has entered a room or that the heat within a given location exceeds a certain predetermined amount.

Abstract: An air flow sensor has a hollow tubular housing partially filled with potting compound and having a printed circuit board mounted in the compound inside the tube. The board is mounted such that two power resistors and a first heat sensing switch mounted on the board are embedded in the potting compound, and a second heat sensing switch mounted on the board above the compound is in contact with the ambient atmosphere. The power resistors are connected in parallel to a power source driving a fan, and the first switch has an actuation temperature selected to activate the switch when the power resistors radiate a selected amount of heat. The second switch also has an actuation temperature due to lack of air flow chosen to activate the switch when the ambient atmosphere reaches the designated temperature.

Abstract: In an automobile, a device for monitoring the flow and temperature of the coolant in the internal combustion engine, comprising a switch of a supply circuit for an alarm, whose mobile part is controlled by a single detector detecting both flow and temperature, disposed at one point of the cooling circuit.