Abstract: To provide a temperature sensing tube for an expansion valve in which a hunting can be prevented by slowing of a temperature reaction rate of an expansion valve, a ceramic sintered member serving as a heat transfer delay member (3) in a temperature sensing tube (1) is fixed so as not to directly contact with a tubular member (2) by fixing springs (4, 4) provided at both end portions (13, 13), whereby a heat transfer from the tubular member (2) to the ceramic sintered member becomes slow, temperature is not transferred from a mated piping directly via the tubular member, whichever outer surface of the temperature sensing tube 1 contacts with the piping, and a reaction rate with respect to a temperature rise of the expansion valve can be made slow.

Abstract: A temperature recorder in the form of a tubular cover and with an inside piston, in which an altered position of the piston is carried out by a mechanical movement released from a bimetal washer, which, when making a sudden change, changes its form from convex to concave when a determined temperature level is reached. Two line-formed screen patterns, a picture formed by colored lines on the inner surface of the tubular cover, shows a certain pattern in the original position, and a different pattern is shown when an inside piston has been moved vertically inside the outer tubular cover. Friction between the outside of the piston and the inner surface of the tubular cover forms a braking means. A reset button can by means of a magnet or a spring repulse or press back the piston which is in the top of the tubular cover and has a magnet and the piston will be pressed back within the tubular cover to its original position and the first patterns will be shown clearly again by the line-formed screen pattern.

Abstract: A shape memory material activated device of the present invention uses a shape memory material activator to create a path through a shell wall of the device. The path through the shell wall may release a substance contained in the shell or allow a substance to enter the shell. The path may be created by fracturing, puncturing, exploding, imploding, peeling, tearing, stretching, separating, debonding, abrading or otherwise opening the shell and, may be permanent or reversible. The substance may be released in one location while the device is stationary or along a path while it is traveling, self-powered by the shape memory material activator. In addition, the substance may be delivered to an object upon contact with its surface. The self powering abilities allow these devices to be used as substance delivery devices as well as actuators, transporters, and energy conversion systems with modular characteristics and growth potential.

Abstract: A temperature indication pipe joint, including a shell, wherein a water conduit is arranged in said shell, and including a heat transmission unit which has a first end in said water conduit and a second end connected to the center of a spiral double sheet metal, said spiral double sheet metal further has an indicating needle extended from its other end. By utilizing the double sheet metal to sense the change of temperature and deform accordingly, the water temperature can be indicated, which can reduce the cost and achieve a simpler structure compared to the digital thermometer used before; when rotating the cover of the present invention, the quantity of water stream will be adjusted.

Abstract: A method and device for monitoring thermal stress in a user is described. The device is designed to include a material having specific thermodynamic properties and physical dimensions defined as a function of those thermodynamic properties. A system for thermal stress monitoring including a thermal stress monitoring device configured within a garment is also described.

Abstract: A fiber-optic temperature sensor with a cantilever beam including two different material strips with different thermal expansion coefficients, the cantilever beam having a reflective surface on an end of the cantilever beam, an optical fiber probe including a transmitting multimode optical fiber and at least one receiving multimode optical fiber for receiving reflected light from the reflective surface. Temperature changes at the sensor are indicated by a change in reflected light coupled into the receiving multimode optical fiber due to lateral displacement of the edge of the reflective surface caused by bending of the cantilever beam. Some embodiments have additional reference receiving fibers for compensation for noise, changes in gap length, and other factors.

Abstract: Cumulative thermal exposures monitors and remote indicating cumulative thermal exposure monitors and system for reading the same are disclosed. The monitors have a thermally insulative housing with a cavity and a thermally-responsive member therein formed of shape memory material, which may be provided with a coating or sheath of insulative or shape memory polymer material, that gradually changes from a first shape to a second shape over a prescribed temperature range wherein the thermal capacity and insulative properties of the housing, cavity, and shape memory material transition temperature range are correlated relative to one another and calibrated to closely match a thermal decay profile (time-temperature profile) of the product being monitored. In remote indicating embodiments, the data can be retrieved remotely via RF transponder technology without directly viewing the monitor device.

Abstract: The thermal detection and visual alarm unit includes a plurality of first expansion thermal detectors (17) with normally closed contacts that are connected in series with a first lamp (15) to form a first two-terminal circuit (21, 23), a plurality of second expansion thermal detectors (18) with normally open contacts connected in parallel, a second lamp (16) connected in series with the second thermal detectors to form a second two-terminal circuit (22, 24), the first and second thermal detectors forming a plurality of cells (19) each combining a first detector and a second detector having respective contact-opening or contact-closing temperatures that are substantially equal, each of the first and second two-terminal circuits being arranged for connection to the terminals of an electrical power supply (12).

Abstract: A metallic laminate composite having a first alloy layer having a low coefficient of thermal expansion, and a second alloy layer having a higher coefficient of thermal expansion. Additional and optional layers may be included in the laminate composite.

Abstract: The invention provides a temperature measurement system including a temperature sensor and means for biasing the temperature sensor in the direction of a thermal energy source in response to receiving thermal energy from the source. The invention also provides a continuous casting system including at least one temperature sensor disposed in the secondary cooling region and means for biasing the temperature sensor in the direction of the strand of metal in response to receiving thermal energy from the strand of metal.

Abstract: An arrangement for controlling a radiant heater of a cooktop comprising a power controller, a changeover switch and a rod controller in a first operating mode which provides for the interruption of operation at temperatures of approximately 600° C. at a first switching point on the rod controller. In a second operating mode, a switch in the rod controller is set to a different switching point resulting in interruption of the power supply at temperatures of approximately 80° C., so that the radiant heater makes it possible to keep food hot without boiling.

Abstract: A temperature measuring device includes a temperature-responsive element that mechanically moves a first inductive assembly component relative to a second inductive assembly component in response to temperature changes. The movement of the first inductive assembly component relative to the second inductive assembly component generates a change in a local eddy current pattern that corresponds to the sensed temperature.

Abstract: A shape memory material activated device of the present invention uses a shape memory material activator to create a path through a shell wall of the device. The path through the shell wall may release a substance contained in the shell or allow a substance to enter the shell. The path may be created by fracturing, puncturing, exploding, imploding, peeling, tearing, stretching, separating, debonding or otherwise opening the shell. The devices according to the present invention may be used as temperature sensors or warning devices, drug delivery devices, and the like.

Abstract: A switch, such as an electromechanical or optical switch, whose state is responsive to temperature history, for example temperature excursions above or below a critical temperature. An element of the sensor made from shape memory alloy changes shape when exposed, even temporarily, to temperatures above the Austenitic start temperature As or below the Martensite start temperature Ms of the shape memory alloy sensor element. The shape change of the SMA element causes the sensor to change between two readily distinguishable states. The sensor can include a one-way stop element that creates a persistent indication of the temperature history. The switch also has built-in stops allowing the sensor to be manufactured and stored at temperatures above the Austenitic temperature without causing the indication of an over-temperature event, before the actual use.

Abstract: The bimetal thermometer according to the invention comprises a bimetal helix arranged inside a protective tube, one end thereof being attached to the protective tube and the other end thereof being connected to a pointer shaft to which a pointer arranged inside a casing is attached. The pointer shaft is rotatably journaled in a bearing assembly in which a cavity is formed through which the pointer shaft extends. The cavity is filled with semisolid lubricating grease for damping vibration movements of the pointer shaft. The pointer shaft has either a smooth surface or is provided with at least one radial projection arranged inside the cavity. Vibration movements of the pointer shaft are damped by the interaction of the pointer shaft and, if provided, the projections with the viscous lubricating grease.

Abstract: A temperature measuring device includes a temperature-responsive element that mechanically moves a first inductive assembly component relative to a second inductive assembly component in response to temperature changes. The movement of the first inductive assembly component relative to the second inductive assembly component generates a change in a local eddy current pattern that corresponds to the sensed temperature.

Abstract: A cooking thermometer having an audible alarm includes a skewer having a segment of a shape memory alloy wire disposed therein. The upper end of the shape memory allow wire is secured to a connecting rod which is operatively associated with a cam assembly. When the skewer and hence the shape memory alloy wire is heated, the shape memory alloy commences a phase transformation from martensite to austenite and contracts. The cam assembly serves to translate the up and down motion of the connecting rod into rotational motion which is transmitted through a spur gear assembly to a pivoting pointer positionable over a temperature indicia plate. A helical spring assembly is positioned on the top of the connecting rod which exerts stress on the connecting rod and shape memory alloy wire during the phase transformation to extend the temperature transformation range and improve and optimize the linearity of the transition.

Abstract: The cooking pan in which one side of an outer circumferential face of a main body is combined with a handle through a bolt fastening has such a construction that a temperature display member is equipped with an upper face of a coupling end part combined with a guide protrusion of the main body, wherein the temperature display member is provided with a sense rod formed in one body from a lower portion of a display, the sense rod being closely inserted into a rod insertion hole of the coupling protrusion projected in one body from the main body, thereby displaying temperature transferred from the coupling protrusion so as to provide an easy cooking and the best taste of food and to prevent unnecessary consumption of fuel in cooking.

Abstract: The invention is directed towards a cooking thermometer having an audible alarm and triggering mechanism therefore. The cooking thermometer includes a skewer having a segment of nitinol wire disposed therein. The nitinol wire is secured to a connecting wire which extends upwardly into the housing and is vertically displaceable within the skewer. The connecting wire extends out of the skewer into a wire guide having a curvilinear passage therein which is adapted to allow sliding displacement of the connecting wire therethrough. The upper end of the connecting wire is fixedly attached to a gear assembly whereby sliding displacement of the connecting wire causes the rotation of the gear assembly, which engages a spur gear train which is connected to a pivoting pointer positionable over the temperature indicia plate.

Abstract: A thermostat assembly for opening and closing an electrical circuit in response to the temperature within a measurement region. The thermostat assembly includes a relatively low-cost bimetal disc thermostat, but may be used in circumstances where temperature or other conditions exceed the design limitations of the bimetal disc thermostat. An elongated probe has a distal end arranged to extend at least to the measurement region, and a heat-disseminating end in thermal contact with a thermally-conductive outer housing surface of the bimetal disc thermostat.

Abstract: A cumulative thermal exposure monitor (10) having a housing (11) with a fluid sealed interior cavity (16) and a thermally-responsive member (20) therein formed of a shape memory material which moves an indicator (21), wherein the thermal properties of the housing, cavity, and shape memory material transition temperature range are calibrated relative to one another to function in mutual cooperation such that the thermally-responsive member gradually changes from a first shape to a second shape upon absorption of heat energy over time to closely match a thermal deterioration profile of a perishable product, and to indicate the cumulative amount of heat energy absorbed and whether, at any time, the temperature has been above a preferred storage temperature range for a period of time sufficient to cause any degree of deterioration based on a known time and temperature thermal deterioration profile of the perishable product.

Abstract: A sensor provides a persistent indication that it has been exposed to temperatures below a certain critical temperature for a predetermined time period. An element of the sensor made from shape memory alloy changes shape when exposed, even temporarily, to temperatures below the Austenitic start temperature As and well into Martensite finish temperature Mf off the shape memory alloy. The shape change of the SMA element causes the sensor to change between two readily distinguishable states. The sensor includes a one-way stop element that creates a persistent indication of the temperature history, allowing the sensor to be manufactured and stored at temperatures above the Austenitic temperature without causing the indication of an over-temperature event.

Abstract: The present invention comprises a sensing element mounted with a body. The sensing element comprises a portion made with a shape memory alloy. The sensing element mounts with the body, fixedly at two ends. The fixed mounting at one end, however, is configured so that it can be converted to allow a moveable relationship between the body and the sensing element. While the mounting is fixed, the sensing element is prevented from indicating temperature deviations, and the apparatus can be stored and handled freely. After the mounting is converted to provide a moveable relationship, however, a temporary temperature excursion can cause the SMA portion to contract, providing a discernible change in the relationship between the sensing element and the body.

Abstract: A sensor provides a persistent indication that it has been exposed to temperatures exceeding a critical temperature for a predetermined time period. An element of the sensor made from shape memory alloy changes shape when exposed, even temporarily, to temperatures above the Austenitic temperature of the shape memory alloy. The shape change of the SMA element causes the sensor to change between two readily distinguishable states. The sensor includes a removable element that prevents the shape change, allowing the sensor to be manufactured and stored at temperatures above the Austenitic temperature without causing the indication of an over-temperature event.

Abstract: Heat detector 10 partially includes housing 20, mount 42 supported by housing 20 including an electrical contact 45, and a bi-metal strip 61 including fixed end 62 fixedly mounted to housing 20, and a free end 64 including an electrical contact 45. Bi-metal strip free end 64 moves responsive to decreasing temperature in a first direction toward mount 42 and responsive to increasing temperature in a second direction away from mount 42. Free end 64 and mount 42 are connected when free end 64 is a predetermined distance from mount 42 such that mount 42 is maintained at the predetermined distance from free end 64 as free end 64 moves in the second direction, such that contacts 45, 65 contact upon movement of free end 64 the predetermined distance in the first direction. Magnet 31 frictionally connects mount 42 to housing 20 and retains mount 42 to housing 20 regardless of orientation.

Abstract: A thermal exposure monitor has a thermally-conductive housing adapted to be placed in close proximity to a product to be monitored and at least one thermally-responsive shape memory alloy member in the housing that has a first shape at temperatures below a critical temperature and a second shape at temperatures above the critical temperature and a transformation temperature range encompassing a prescribed detrimental temperature related to the product being monitored. An indicator associated with the thermally-responsive member is moved from an initial position as the thermally-responsive member changes from the first shape to the second shape so as to be visually observed through a window on the housing to visually indicate whether the product being monitored has been exposed to temperatures above the prescribed detrimental temperature for a period of time that would be detrimental to the product.

Abstract: The bimetallic plates of the steam trap disclosed each comprise three same-direction active arms next to one another extending transversely to a center line. On the center line two active arms extend in opposite directions to one another and transversely to the other active arms. On the side of the bimetallic plates which curve concavely when deflected there are provided projections as support portions or faces for the active arms. The projections of at least two active arms project beyond those of the other active arms. The projections of the active arms come into effect at different temperatures and with accumulative force. The bimetallic plates therefore have a closing force line closely adapted to the saturated steam curve.

Abstract: A method for adjusting the calibration of a circuit breaker trip mechanism including a terminal element, a bimetal element connected thereto, and a trip bar. Laser energy is applied to lanced or pre-bent surfaces of the terminal element to thermally induce displacement thereof and thereby modify a trip distance between the bimetal element and the trip bar. Where a laser beam is directed to fall on a middle leg of a lanced or pre-bent section of the terminal element, the bimetal element moves in one direction relative to the trip bar. Conversely, where a laser beam is directed to fall on lateral legs of the lanced or pre-bent section of the terminal element, the bimetal element moves in an opposite direction relative to the trip bar. Thus, laser energy may be applied from the same direction, or to the same side of the trip structure, regardless of whether the trip time is to be increased or decreased.

Abstract: A temperature probe for use in a product flow line including a valve seat secured in the flow line, a valve stem and an orifice ring. The orifice ring is attached to the valve stem to define a pair of flow paths for product passing through the product flow line. One flow path is through the ring and the other is between the ring and the valve seat. A temperature sensing probe is carried by the valve stem and positioned in the orifice ring for sensing the temperature of the product in the flow line. A spring is connected to act on the valve stem and is responsive to changes in velocity of the product in the flow line to move the orifice ring toward and away from the valve seat to maintain the velocity of the product flowing past the probe constant.

Abstract: In an exemplary embodiment of the invention, a calibration arrangement and process for use in a circuit protective device are presented. An exemplary calibration assembly for use in the calibration process of the present invention includes a split clamp arm having a first opening for receiving and holding a calibration pin and a second opening for receiving an actuator key. A portion of the split clamp arm is divided into a first arm and a second arm by a channel which extends from a first end of the split clamp arm through the first opening and communicates with the second opening. The split clamp arm is opened by inserting the actuator key through the second opening and because of the preferred oblong or rectangular shape of the second opening of the split clamp arm, rotation of the actuator key therein forces the members forming the first opening of the split clamp arm apart from one another.

Abstract: A method for adjusting the calibration of a circuit breaker trip mechanism including a terminal element, a bimetal element connected thereto, and a trip bar. Laser energy is applied to lanced or pre-bent surfaces of the terminal element to thermally induce displacement thereof and thereby modify a trip distance between the bimetal element and the trip bar. Where a laser beam is directed to fall on a middle leg of a lanced or pre-bent section of the terminal element, the bimetal element moves in one direction relative to the trip bar. Conversely, where a laser beam is directed to fall on lateral legs of the lanced or pre-bent section of the terminal element, the bimetal element moves in an opposite direction relative to the trip bar. Thus, laser energy may be applied from the same direction, or to the same side of the trip structure, regardless of whether the trip time is to be increased or decreased.

Abstract: A temperature probe for use in a product flow line including a valve seat secured in the flow line, a valve stem and an orifice ring. The orifice ring is attached to the valve stem to define a pair of flow paths for product passing through the product flow line. One flow path is through the ring and the other is between the ring and the valve seat. A temperature sensing probe is carried by the valve stem and positioned in the orifice ring for sensing the temperature of the product in the flow line. A spring is connected to act on the valve stem and is responsive to changes in velocity of the product in the flow line to move the orifice ring toward and away from the valve seat to maintain the velocity of the product flowing past the probe constant.

Abstract: A thermometer includes a housing with a C-shaped window therein and a temperature scale adjacent to the window. A member within the housing has a colored or shaded region with a boundary visible through the window. The colored region is sufficiently large so that it fills the window from the lower side of the temperature scale up to the boundary. The boundary is moved relative to the temperature scale by a bimetal coil spring. The boundary and the colored region indicate the temperature being read by the thermometer. In one version of the invention, the window extends in an arc of about 180.degree., the member is a substantially planar disk, and the colored region is a semi-circular portion of the disk. The disk is mounted within the housing on a shaft, and the disk rotates relative to the shaft. The thermometer is easily readable under a variety of viewing conditions, especially adverse viewing conditions.

Abstract: A multi-function sensor using a semiconductor laser capable of sensing a value of a measurement object such as temperature, humidity, pressure or vibration on the basis of a variation in the distance between a measurement object medium adapted to respond to a variation in the measurement object and a focus of laser beams projected onto the measurement object medium and thereby capable of measuring the measurement object in a high accuracy irrespective of a variation in the quantity of laser beams depending on a variation in surrounding circumstance.

Abstract: For use in a measuring and analysis instrument, a sensor including a sensor element responsive to changes in a quantity to be measured by the instrument. The sensor element is formed from a deformation heat-recoverable material having a predetermined range of temperatures in which recovery occurs. The sensor may include a control mechanism for maintaining the temperature of the sensor element substantially within the predetermined range. The sensor element forms a part of a circuit including a power source, and the control mechanism may include apparatus for selectively heating the sensor element. The sensor element is operatively connected to a signal device for sensing a physical characteristic of the sensor element and generating signals corresponding to the characteristic sensed. The signal device may include a temperature sensor, a force sensor, or a light sensor.

Abstract: This device comprises a casing (2) of synthetic material containing a motor element (7) made of at least one alloy which memorizes its shape and having associated with it a movement transmission element consisting of a piston (9) and a rod (10) and acting on at least one indicator element (4) irreversibly recording each overstepping of a predetermined temperature, the casing being provided with transparent windows permitting the state of the indicator element or elements to be viewed.Application to the monitoring of the overstepping of a temperature.

Abstract: This device comprises a casing of synthetic material containing a motor element made of at least one alloy which memorizes its shape and having associated with it a movement transmission element consisting of a piston and a rod and acting on at least one indicator element irreversibly recording each overstepping of a predetermined temperature, the casing being provided with transparent windows permitting the state of the indicator element or elements to be viewed.

Abstract: In a thermostatic bimetallic measuring element, an adjustment lever (5) which bears a thermostatic bimetallic body (6) is held, on the one hand, by a collar (24) of a setting eccentric (12) and, on the other hand, by a holding section (14) which is formed on a section of the adjustment lever (5) which engages through a slot in a rear plate (1) of the thermostatic bimetallic element and rests against the back of the rear plate (1). By turning the setting eccentric (12), displacement of the adjustment lever (5) is possible around an imaginary of actual pivot shaft which engages into the slot.

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: This device comprises a casing of synthetic material containing a motor element made of at least one alloy which memorizes its shape and having associated with it a movement transmission element consisting of a piston and a rod and acting on at least one indicator element irreversibly recording each overstepping of a predetermined temperature, the casing being provided with transparent windows permitting the state of the indicator element or elements to be viewed.

Abstract: Disclosed is a temperature-sensing member including a columnar or hollow cylindrical base having a configuration of a circular or polygonal column or a hollow circular or polygonal cylinder; and at least one strip member of a material having a different coefficient of thermal expansion from that of the base, wherein the strip member is provided on at least a portion of an outer peripheral surface of the base at an acute angle with respect to an axis of the base and in such directions as to intersect each other on opposite sides of the base. In a case where two or more of the strip members are provided on the base, the strip members are disposed in mutually different directions with respect to an axis of the base and at an acute angle with respect to the base.

Abstract: A laser thermal testing method and system for use in testing a fire alarm system which has a plurality of heat-sensors which are remotely distributed throughout a protected area. The laser thermal testing system includes a first laser and a second laser. The first laser generates an aiming beam of coherent electromagnetic radiation in the visible spectrum. The laser thermal testing system also includes a movable reflector which reflects the aiming beam. The movable reflector is optically coupled to the first laser. The movable reflector is first moved in order to align the aiming beam in an aligned position so that the aiming beam is reflected onto one of the heat-sensors. The movable reflector is then fixedly secured in the aligned position. The second laser generates a heating beam of coherent electromagnetic radiation in the infrared spectrum.

Abstract: A test specimen is provided, that is constructed of dual materials, which are preferably metallic materials and which are more preferably an austenitic iron alloy and a ferritic iron alloy. The specimen is generally constructed as a rectangular configuration, with two principal legs, connected together by substantially rigid connections at their ends, with the legs being of the different materials, such that, when the specimen is subjected to heat, one leg will expand linearly an amount greater than the other leg allowing the imposition of bending stress, whereby a given leg will experience both tension and compression. Observation may then be made, by a microscopic examination or otherwise, of those surfaces that are adjacent the portions of the legs that experience most of the tension and compression, such that the effects of temperature on the materials may be observed and recorded.

Abstract: A temperature warning device for monitoring the temperature of an article and for providing a dependable signal that a preselected temperature has been reached. The device includes an axially extending bore into which a heat responsive element, a driver, and a sensing indicator are arranged. The bore is normally sealed by a closure plug to prevent failure due to contaminants. Upon reaching a preselected temperature the element exerts force against the driver which in turn forcibly removes the closure plug, exposing the indicator.

Abstract: Apparatus for monitoring temperature, including: a body which experiences a change in shape in response to a change in the temperature of the body; a rotatable device having an axis of rotation and an optical transmissivity which varies circumferentially and radially relative to the axis of rotation; a light conductor device disposed for passing a light beam along a beam axis which intersects the rotatable device at a location spaced from the axis of rotation; and an arrangement for rotating the rotatable device about the axis of rotation while the light beam impinges on the rotatable device such that the rotatable device permits light to be transmitted therethrough with an intensity which varies in time as a function of the distance between the beam axis and the axis of rotation, with one of the devices being mounted on the body such that a change in the shape of the body in response to a change in body temperature produces a corresponding change in the distance between the axis of rotation and the beam axis

Abstract: A thermocouple temperature sensing device is disclosed for monitoring temperature at a plurality of selected locations along the length of an elongated conduit immersed within a heat conducting medium. The thermocouples, being progressive in length, are respectively attached to a common support rod by means of a thermal element. The thermal element is constructed to include an arcuate shaped strip of memory metal attached to the support rod and thermocouple by means of a C-shaped clip. As each thermal element reaches its transition temperature, its shape memory effect causes the thermal element to displace the thermocouple into forceable engagement with the inner wall of the conduit for monitoring the temperature thereat. As long as the thermal element is subjected to its transition temperature, there is a constant force being applied to the thermocouple.

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: The invention relates to an optoelectromechanical apparatus for measuring physical parameters, as pressure or force, comprising an emitting optical fibre coupled via its input with a light source, receiving optical fibre connected over its output to signal processing means and a carrier including a resilient member for bearing the emitting and the receiving optical fibres, wherein the input of the receiving optical fibre is in optical coupling with the output of the emitting optical fibre, advantageously through a spacing and the processing means comprise a first and a second photodiodes for detecting light of the light source and the light output of the receiving optical fibre.

Abstract: A fiberoptic sensing system comprising a light source, a sensor responsive to external stimulus, an optical fiber connected to the light source and the sensor, a detector arranged to receive light from the optical fiber, and output electronics electrically connected to the detector. The sensor includes a reflective surface arranged so as to reflect light from the optical fiber. This reflective surface is movable relative to the optical fiber. The light source comprises a light-emitting diode and a reference diode electrically connected to the source of electrical energy and to the light-emitting diode. A beamsplitter is disposed about the light source, the optical fiber, and the photodetector. The detector includes a transimpedance amplifier and a RMS to DC converter. The output electronics includes a gain control and a offset control. The sensor may be either a temperature sensor or a pressure sensor.

Abstract: Detector apparatus adaptably mountable about the external surface of steam pipes and condensate pipes, and wherein the apparatus includes a curved temperature sensitive bi-metallic element fixedly mounted at one end and with the opposed end being free to flex. A push arm is mounted at the free end of the bi-metallic element in engagement with a temperature indicating element for indicating a temperature either within or outside of a range of desired maximums and minimums, utilizing calibrated reference in the form of a rotatable dial. The surface temperature of the steam or condensate pipe being monitored is determined. The apparatus is provided with mounting member or system capable of use in combination with cylindrical surfaces within a range of diameters.