Abstract: The invention provides a simple, non-invasive means for measuring pressure of fluid in fluid-containing, resilient tubing by measuring the force to mechanically compress the tubing to a predetermined distance. In the apparatus of the invention, first and second opposed members are moved together to a predetermined distance to compress the fluid-containing, resilient tubing therebetween. Measuring means connected to at least one of the members is used to measure the force exerted by the fluid-containing, resilient tubing against the members when the members are at the predetermined distance from one another, wherein the measuring means has been pre-calibrated at the predetermined distance, to correspond to fluid pressure within the fluid-containing, resilient tubing. An important application of the invention is the provision of a convenient, non-intrusive, low-cost device for field measurement of pressure in drip irrigation systems, without installing special fittings or puncturing the tubing.

Abstract: The transducer (1) includes a support structure (2, 3) in which a metal body (8) is mounted, having a flat surface (8a) and on the opposite side a cavity (8b) for exposure to a pressure to be transduced. A thin wall (8c), resiliently deformable like a membrane under the effect of the pressure, is defined between the bottom of the cavity (8b) and the flat surface (8a). An inductor (10) a body of ferromagnetic material (11)is securely fixed to the metal body (8) and has a flat surface (11a) facing the flat surface (8a) of the metal body (8) and an annular recess (12) which defines a central core (13) with a winding (16) arranged therein and a surrounding sleeve (14). A spacer wing (9) of paramagnetic or diamagnetic material, and a calibrated thickness, is interposed between the metal body (8) and the ferromagnetic body (11).

Abstract: The present invention provides a test method of hydrostatic pressure of an inflator housing which can evaluate a hydrostatic pressure conveniently.

Abstract: A remote pressure sensor includes a probe having a chamber for holding a liquid. A flexible membrane is mounted in the probe. A conduit joins a reference cell to the chamber for holding the liquid. And, a reference pressure gauge is operatively joined to the conduit for measuring pressure of the liquid therein for use in referencing a primary pressure sensor through which fluid flows.

Abstract: The invention proposes a device for measuring the pressure of blood, intended to engage with a section (16) for measuring the pressure of blood, which section comprises a membrane (38) which is axially deformable under the effect of the blood pressure and which is designed to be mounted on a support structure (20, 22) bearing especially a load sensor (26) arranged substantially facing the membrane (38), characterized in that it comprises controlled means (58) for the relative axial displacement of the sensitive member (52) of the load sensor (26), with respect to the support structure (20, 22), so that the axial position of the sensitive member (52) can be adjusted with respect to the external face (42) of the membrane (38), especially for the purpose of carrying out an initial calibration operation.

Abstract: An apparatus for accurate temperature and pressure measurement in production processes is described. In designing the temperture pressure probe, novel features are described which include minimization of the thermal mass of the thermal probe, thermal isolation of the thermal probe from its surroundings, and generating turbulence in the vicinity of the thermal probe where it comes in contact with the fluid flow. Embodiments disclosed for the pressure sensor include a recessed position where fluid pressure transients are minimized, and a surface mounted pressure sensor that is useful where the pressure sensor of the first embodiment is likely to get clogged due to fluid composition.

Abstract: A method of sensing fluid pressure in which a deformable tube provides an accessible and substantially flat section. Deflection of the flat section reflects line pressure. In one embodiment, a fluid pressure sensing apparatus comprises a deformable tube for carrying fluid and at least one constraint member comprising an inner surface and a pressure sensing opening. The inner surface comprises a substantially flat portion and a constraint portion. The tube is positioned against the inner surface and constrained by the constraint portion such that a portion of the tube is deformed against the substantially flat portion of the inner surface. This produces a substantially flat section of the tube adjacent to, and accessible through, the pressure sensing opening. Similarly, a method of manufacturing a fluid pressure sensing apparatus comprises the steps of: providing a deformable tube, and constraining the tube to provide an accessible and substantially flat section of the tube.

Abstract: An apparatus for erecting a foundation element in a ground surface including a drilling device, a pumping device, a pressure transducer and a control unit. The drilling device includes a hollow core tube and an auger bit adapted to drill a hole in the ground surface while the pumping device is adapted to pump a solidifying suspension material under pressure through the hollow core tube and into the hole in the ground surface. In addition, the pressure transducer is mounted on the core tube and is adapted to provide a pressure signal indicative of a pressure of the solidifying suspension material in the core tube while the control unit is adapted to control the pressure of the solidifying suspension material.

Abstract: A pressure sensor includes a tube for channeling a fluid therethrough. A seat is disposed in an outer surface of the tube, with a flexible diaphragm at the bottom thereof. The diaphragm is planar, and blends at its perimeter coextensively with an arcuate inner surface of the tube. A gauge is mounted in the seat above the diaphragm for measuring flexure thereof under pressure of the fluid inside the tube.

Abstract: A contact pressure detecting sensor having a simplified structure. The sensor includes a pair of air-impermeable sheets and at least one foamed plastic member interposedly arranged between the air-impermeable sheets while being kept from being uncompressed. The foamed plastic member is capable of resuming its original configuration after compression. The sensor also includes at least one tube arranged so as to extend from the vicinity of the foamed plastic member to outside the air-impermeable sheets. The air-impermeable sheets are joined to each other at portions thereof positioned around the foamed plastic member and tube.

Abstract: A sensor element suitable for sensing pressure values of fluid pressure at high pressure ranges on the order of 40,000 psi and above and comprised of a predetermined length of a closed end tube which at zero applied pressure is of rectilinear configuration. The tube contains a round bore eccentrically disposed parallel within the tube having one end open at which to receive fluid pressure. By virtue of the eccentric relationship of the bore to the tube, an internal bending moment occurs under pressure loading that is proportional to the applied pressure and which bending moment causes the free closed end of the tube to deflect in a direction opposite to the direction to the which the bore was predisposed with respect to the OD center line of the tube.

Abstract: A sensor used especially for the measurement of the internal pressure of injection lines of diesel engines comprises two housing parts which are connected via an articulation and can be clamped to the line with a tension device. For simple and in particular one-handed attachment of the sensor in every state of opening or closing, the tension device is located in the same sector, facing the articulation, on one side of the external region of the tube. The connecting plug for the discharging of the measuring signals is preferably insertible in the correspondingly fashioned articulation and can be locked there.

Abstract: A sensor is provided that can be used for measuring the internal pressure of injection lines of diesel engines includes two housing parts that are connected via a joint and can be clamped to the injection line using a clamping device. At least one electrical measuring element is pressed, in essentially uniform elastic fashion, onto the surface of the hollow body to be measured. The sensor also includes a support element that operates essentially in radial fashion. A protective film is arranged between the surface and the measuring element. The protective film has a thickness greater than or equal to the radial dimension of foreign bodies or the like that are to be expected on the surface of the hollow body to be measured. The protective film consists of plastic with a low modulus of elasticity.

Abstract: An apparatus that senses the pressure within a fluid line which has an external surface. The apparatus includes a sensor which has a probe that is in contact with the external surface of the fluid line. Any change in pressure deflects the fluid line and displaces the probe. The sensor provides an output signal that is representative of the probe displacement.

Abstract: A device and method for detecting pressure changes in a pressurized vessel, such as a gas storage bottle of an inflator of a vehicle restraint system. At least two reference marks are positioned on an outside surface of the vessel for indicating the pressure in the vessel. The marks are spaced apart on the surface by a predetermined distance. The predetermined distance can be measured at intervals, and correlated to determine changes in the pressure of the vessel. The references marks can be physical, i.e., paint or scratch marks, or magnetic, such as a magnetic bar or stripe. The physical marks can be read by an optical laser and the magnetic marks by a magnetic head, such as a floppy or hard disk drive, or a CD-ROM.

Abstract: A vacuum system comprising a vacuum pump and a vacuum indicator. The vacuum pump comprises a cylinder, a piston disposed in the cylinder, a piston rod fixed to the piston and extending through an end of the cylinder, the rod being movable reciprocally, a sealing ring disposed on and around the piston and in engagement with an inside wall of the cylinder, and stops extending radially outwardly from the piston, the stops including a proximal stop and a distal stop, the sealing ring being axially movable between the proximal and distal stops, the piston having an axially-extending groove therein, the groove extending from proximal of the distal stop to proximal of the proximal stop, whereby upon movement of the piston in a first direction, the sealing ring engages the distal stop and seals an annular space between the piston and the inside wall of the cylinder, and upon movement of the piston in a second direction, the sealing ring engages the proximal stop and leaves unobstructed the axially-extending groove.

Abstract: A formed metal diaphragm for use in fluid pressure regulators includes a dome-shaped central portion and a convoluted shaped flexible area. The convoluted shaped flexible area includes a series of radially spaced elliptically shaped impressions in the diaphragm surface. The major elliptic axis of each impression is aligned with a radius emanating from the center of the diaphragm. The minor ellipse axis of the impressions is located on a concentric axis outward from the center of the diaphragm.

Abstract: A pressure monitoring isolating device for monitoring the pressure of fluid in a pipeline. The device comprises an annular housing that is axially insertable in the pipeline between two ends thereof. The annular housing has a central opening through which fluid in the pipeline flows. The central opening defines an inner diameter of the annular housing. Secured to the annular housing around the central opening thereof is a flexible sleeve member. An annular fluid chamber is positioned around and in communication with the outer surface of the sleeve member. A sensing fluid cavity extends radially from the annular fluid chamber toward the outer periphery of the annular housing. The annular fluid chamber and the sensing fluid cavity is filled with a sensing fluid. An elastomeric member seals the top end of the sensing fluid cavity. A pressure gauge assembly is releasably secured around the upper end of the sensing fluid cavity.

Abstract: An apparatus for measuring the pressure of a liquid in a container includes a capacitor formed by a pair of electrodes. A charging circuit produces a charging current of constant magnitude. The charging current is used to charge the capacitor to a predetermined voltage. A timing circuit measures the elapsed time between the time at which the charging circuit begins to produce the charging current and the time at which the capacitor has been charged to the predetermined voltage. The timing circuit produces a pulse width modulated signal. The magnitude of the pulse width modulated signal is indicative of the time difference and thus, the pressure within the container.

Abstract: A low pressure sensing device for sensing pressure changes in a pressurized gas storage bottle of an inflater. At least one wire is wrapped around the vessel to sense the expansion or contraction of the vessel due to pressure changes in the vessel. The wire has a first end and a second end. The first end of the wire is secured to the vessel and the remainder of the wire is free to move circumferentially relative to the vessel in response to the expansion and contraction of the vessel. This relative movement can be monitored to determine if a pressure change has occurred in the vessel.

Abstract: An in-line pressure transducer includes a body and an inner ring, coupled to the body, through which molten material flows. The inner ring expands in response to pressure from the molten material. An outer ring is located coaxially with the inner ring. At least one flexure connects the inner and outer rings. The flexures translate expansion of the inner ring to the outer ring. The body includes a cavity within which the outer ring is located. The cavity preferably has a cross-sectional shape that is trapezoidal in order to compensate for lateral displacement of the transducer in response to axial forces exerted thereon during operation.

Abstract: A fluid condition sensing transducer includes a fluid containment device having a cylindrical side wall including an inner surface in contact with a fluid and an outer surface, a diaphragm integral with the side wall defined by a recessed portion of the side wall and extending between the inner surface and a recessed portion of the outer surface, and an in-situ, non-invasive sensor mounted on the recessed portion of the outer surface for sensing surface conditions of the diaphragm whereby the condition of the fluid in the containment device is sensed.

Abstract: The invention is a pressure sensor including a main body including a pressure inlet at and end thereof, a deformable section deformed by a pressure introduced through the pressure inlet, and a non-deformable section maintaining the shape thereof even when supplied with a pressure introduced through the pressure inlet; an amorphous magnetic alloy member having a magnetostriction constant, the amorphous magnetic alloy member being adhered on the deformable section and the non-deformable section; a first permeability detection element for detecting the permeability of a part of the amorphous magnetic alloy member corresponding to the deformable section; a second permeability detection element for detecting the permeability of another part of the amorphous magnetic alloy member corresponding to the non-deformable section; and a yoke for covering the first and the second permeability detection elements; the yoke is adhered on the main body.

Abstract: A pressure transducer for an injection molding machine includes a housing coupled to a nozzle of an injection molding machine. A hollow stress tube, attached to the housing, through which molten material of the injection molding machine flows, bellows in response to pressure from the material. An outer ring having an opening is coupled to the stress tube such that the outer ring expands, causing displacement of the outer ring about the opening, when the stress tube bellows. A displacement sensor is included for determining the displacement of the outer ring about the opening. This displacement is directly proportional to the pressure of the material. In this manner, the pressure transducer determines the pressure of the molten material.

Abstract: To draw samples from a source of liquid, a pumping system measures the amount of liquid being pumped by detecting pump cycles and calculating the pumped liquid from this measurement and stored data including conduit size, pressure head and statistical data to correlate detected pump cycles with volume of liquid pumped. Pressure pulses caused by a peristaltic pump are sensed by a piezoelectric film positioned on an inlet conduit connecting the pump to the source of water and, when the liquid reaches a predetermined point determined by the nature of the pulses, the pulses are counted to determine the number of pump cycles.

Abstract: A pressure transducer for an injection molding machine includes a housing coupled to a nozzle of an injection molding machine. A hollow stress tube, attached to the housing, through which molten material of the injection molding machine flows, bellows in response to pressure from the material. An outer ring having an opening is coupled to the stress tube such that the outer ring expands, causing displacement of the outer ring about the opening, when the stress tube bellows. A displacement sensor is included for determining the displacement of the outer ring about the opening. This displacement is directly proportional to the pressure of the material. In this manner, the pressure transducer determines the pressure of the molten material.

Abstract: A homogenizer comprises a homogenizing valve mounted to a pump block. The pump has multiple plungers housed in a set of pump chambers formed through a surface of the pump block. Sets of suction valves and discharge valves are positioned in valve bores formed through the block intersecting the pump chambers. During homogenization, each plunger reciprocates in a pump chamber to draw fluid through a suction valve and the pump chamber and discharge that fluid through a discharge valve and subsequently to the homogenizing valve. The homogenizer has a plurality of seals located along its fluid flow path and positioned to have a surface exposed directly to the fluid. As such, the homogenizer is characterized by the absence of recessed seals along the fluid flow path and provides an internal geometry in which microorganism growth and fluid residue buildup are minimized.

Abstract: A fiber-optic strain gauge manometer and a method thereof are for measuring pressure of a fluid, to be respectively connected to a light source and a measurement apparatus. The manometer comprises: a cylindrical hollow body, acting as a pressure transducer, having an inlet by which the fluid can get inside, free ends such that longitudinal and circumferential strains are generated in the hollow body by the pressure of the fluid, thereby producing a dilatation of the hollow body, and a highly birefringent optical fiber having a sensing portion bonded to the outer surface of the hollow body along a longitudinal path such that its birefringence changes when the sensing portion is subjected to the dilatation of the hollow body. A polarized light beam is generated by the light source and transmitted in a form of two polarization eigenstates each parallel to one of two parallel principal birefringence axes of the birefringent optical fiber.

Abstract: A method of making an isolator flow device for use in a process fluid system. The device has a body and an elastomeric sensor ring in the body, through which process fluid flows. There is an annular space outside the sensor ring for communicating outside the body to sense pressure on the ring by the process fluid. In the method, the ring is formed by in-situ molding to the body, and is bonded to the body at its opposite ends, leaving an intermediate portion unbonded. Then, the elastomer will shrink annularly to create an annular space between the body and the ring.

Abstract: A tire gauge includes: a bellows telescopically mounted in an interior within a tire, a flexible indicator rod protruding outwardly from and secured with a piston member secured on a movable end portion of the bellows slidably held in a guiding tube either straightly or arcuately formed on an outer surface of the tire or combinably secured with a filling valve of the tire, so that the bellows will be subjected to a pressure inside a tire at a real temperature in the tire interior and the tire pressure will urge the bellows and the indicator rod outwardly to a final balanced position for showing a true pressure data which is measured isothermally inside the tire.

Abstract: A machining head carries at its end a sensor comprising a pressure-sensitive element (4) mounted on the parts (1, 2) holding the injector jet for the machining fluid, as well as the buffering pieces (5, 6, 12) forming a shield. The element (4) is an insulating and watertight tube, arranged to form a ring in the space left between the coaxial, truncated conical surfaces of the parts (1) and (2). It contains conducting parts which come into contact with one another when it is deformed by the action of a pressure whose value exceeds a given threshold. This results in the closing of an electrical circuit which transmits an appropriate signal to the controls of the EDM machine in order to interrupt the relative movement of the head. The device enables any shock or abnormal stress acting on the end of the machining head to be detected. By means of an O-ring seal (7) acting as a hinge, the part (1) and the piece (12) are returned to their original positions when the stress disappears.

Abstract: The subject apparatus enables detecting changes in pressure of the fluid in a conduit from outside the conduit without disturbing the conduit or its function. The detection is made by sensing changes in diameter of the conduit caused by pressure changes, using a linear measurement electrical transducer. The transducer is mounted in a cylindrical sleeve which telescopes in a second sleeve which is externally threaded at both ends. A fixture is threaded onto one end with the sensing probe of the transducer extending through a hole in the fixture. An auxilliary sleeve is installed between the transducer support sleeve and the fixture, and also extends through the fixture and is forced toward the fixture by a compression spring between the transducer sleeve and auxilliary sleeve. A knurled knob is threaded onto the second sleeve and is used to adjust the position of the transducer along the axis of the sleeve.

Abstract: The invention relates to a pressure measurement device (1) for fluids flowing in lines (5, 6), particularly for the flexible tubing lines of pressure-controlled roller pumps (22) for use in arthroscopy and urethroscopy. A membrane (8,8') is provided such that it is impacted on the inside by the fluid. A first pressure sensor (12) is connected to the outside of the membrane for measurement of fluid pressure. The first pressure sensor is connected to an evaluating electronic unit.A second pressure sensor (13) is connected to the evaluating electronic unit and is assigned to the outer side of membrane (8,8'), so that it is possible to effect a pressure monitoring based on the second pressure measurement, e.g., in the form of a measurement of pressure difference.

Abstract: A nonintrusive flow sensing system (10) and related method are provided for monitoring fluid flow within a conduit (14), particularly such as a liquid flow (12). The sensing system (10) includes an array of ultrasonic transducers (18, 20, 24, 26) mounted on the conduit (14) and adapted to send and receive pulsed ultrasonic signals bidirectionally across the conduit with an upstream-downstream component of direction, and through the conduit in longitudinal and circumferential directions. Signal transit times are processed to obtain accurate measurements of liquid flow velocity, temperature and pressure.

Abstract: A transducer for detecting pressure changes in pipes by detecting deformation of the pipes and for converting the pressure changes in the pipes into electric signals includes a piezoelectric element having a bimorph structure as a sensor element. The piezoelectric element is constructed in such a way that an intermediate layer is interposed between two piezoelectic pieces. The element is pressed against the pipe surface by a holder which is sufficiently elastic to allow opposite ends of the piezoelectric element in the circumferential direction of the pipe to elastically abut against the pipe periphery. Thereby the ends of the piezoelectric element can be pressed in tight contact against the outer surfaces of pipes having various diameters, and the internal pressure of the pipes can be detected reliably.

Abstract: A transducer measures the pressure of a fluid within a hollow conduit, typically one with a circular cross-section, having a central region that is deformed to a non-circular cross-section. This non-circular portion of the conduit displaces radially and repeatably without hysteresis in response to the pressure of the fluid in the conduit in a manner that corresponds to the pressure. A variable capacitor assembly, or a set of strain gauges mounted on the exterior of the non-circular portion, produce an electrical signal proportional to the radial displacement or to the strain, respectively. In one capacitive form, a pair of electrodes are mounted on opposite sides of the non-circular portion formed as free end portions of metallic sheet members with a central channel. In another capacitive form, electrodes are mounted at one or both ends of lever arms which in turn are coupled to the non-circular portion with a set of flexure plates to produce a mechanical amplification of the radial displacement.

Abstract: A pressure sensing device is provided for sensing pipeline pressure particularly for pipes transporting corrosive or abrasive fluids and slurries where it is essential to isolate the instrumentation from the fluid in the pipeline. A body member is provided with a central bore with a recessed midportion in the body member extending 360.degree. around the central bore. A replaceable sleeve member is screw-fit within the body member and has a recessed midportion to mate with the recessed midportion in the body member to form a chamber. A thin metal wall in the midportion of the sleeve member forms an end wall of the chamber within the body member. A plurality of outwardly extending pleats or folds are die-formed in the thin metal wall so as to permit the metal sleeve to readily move inwardly and outwardly in response to variations in pressures of fluid passing through the sleeve. A pressure sensing instrument is mounted on the body member and the chamber within the body member and sleeve is filled with fluid.

Abstract: A pressure measurement device and method involves placing a load cell in a housing adjacent the pipe in which the pressure is to be measured. The housing includes a main block and clamping block. Pressure of the fluid in the pipe distorts the pipe and this distortion is detected by the load cell which produces a signal corresponding to that pressure.

Abstract: A pressure sensor for determining the pressure of a medium in an elastic hose section. A pressure member acts on a unilaterally fixed bar carrying an influencing member at its free end. This influencing member is a core of a coil arrangement, the position of the core changing the frequencies of the oscillator coils. Numerous pressure values are received at regular intervals and, subsequently, a representative pressure value is obtained by averaging.

Abstract: An apparatus for measuring fluid pressure in a passage or tube for use with medical apparatus such as balloon catheters. A diaphragm gauge is provided and includes a case which houses a first diaphragm, a translation mechanism connected to the first diaphragm and a pointer attached to the translation mechanism for providing readouts of fluid pressure. The diaphragm is coupled to a fluid passage, such that changes in fluid pressure cause the diaphragm to activate the translation mechanism, thus providing readouts by means of the pointer. A second diaphragm is provided for sealing the fluid passage from the first diaphragm, for preventing transfer of materials between the first diaphragm and the passage. The second diaphragm is of a biocompatible, nonpyrogenic, sterlizable material, such a polyurethane, polyvinylchloride, or polyethylene. Alternatively, a biocompatible, nonpyrogenic coating may be provided on the first diaphragm for sealing it from the fluid passage.

Abstract: A mechanical pressure switch is provided which includes a conduit that is expandable and contractable in response to the pressure of fluid passing through the conduit. A switch is mounted in a fixed position relative to one portion of the conduit and an actuator is mounted in a fixed position relative to a second, spaced portion of the hose such that the switch will be mechanically activated and deactivated by movement of the actuator relative to the switch in response to pressure changes in the conduit. Preferably the relative positions of the actuator and switch are adjustable in the same direction as the expansion and contraction of the conduit.

Abstract: An improved pressure gauge which constantly indicates gas pressure in a line. A tubular adapter is attached in a gas supply line. The adapter is provided with a passage which permits gas to flow into an annular chamber defined between an outer sleeve secured to the line adapter and a tubular plunger. The plunger, an annular seal, and a spring are retained on the adapter by the sleeve. The seal, plunger and spring are arranged concentrically about the adapter. Gas pressure entering the chamber forces the seal to engage the plunger which, when sufficiently high, compresses the spring, moving and exposing the plunger. The outer surface of the plunger is provided with numbers and lines thereon which indicate gas pressure at the gauge.

Abstract: A detector for a blocked condition in a tube of a liquid infusion pump includes a moveable shaft which is kept in contact with the outer wall of a flexible tube for transporting a liquid therethrough and moves according to the changes in the outer diameter of the tube corresponding to changes in the internal pressure of the liquid. A magnet core is affixed to this shaft and affects the inductance of a solenoid coil which is affixed at a fixed position. A blocked condition in the tube is detected by monitoring the change in the inductance of this coil.

Abstract: A fluid-pressure detector comprising a pillow-like body capable of expanding and shrinking depending on pressure of fluid flowing in the pillow-like body, a detecting means for detecting an amount of expansion or shrinkage of the pillow-like body, and a connecting means for detachably connecting a detecting portion of the detecting means to an outer surface of the pillow-like body. Fluid pressure can be detected continuously and accurately both in the case of positive pressure and in the case of negative pressure. The detecting means is detachable from the pillow-like body, so that only the pillow-like body can be discarded while leaving the expensive detecting means as it is.

Abstract: An apparatus is disclosed for determining pressurization in a nuclear fuel rod and the like by measuring the increase in diameter of the fuel rod occasioned by the internal pressurization of the rod, and which includes an elongate receiving member having front and rear ends and an axial opening extending therein. A gauge is positioned in the axial opening and is adapted to coaxially surround the fuel rod and then measure an increase in diameter of a fuel rod caused by a pressure increase within the rod. The gauge is formed from a substantially C-shaped bracket having inner and outer surfaces, spaced distal end portions and a more thin medial portion, and with a strain gauge mounted on both the inner and outer medial surfaces. A microprocessor is connected to the strain gauges so that changes in electrical output from the strain gauges can be measured to determine the increase in diameter of the fuel rod upon pressurization of the fuel rod.

Abstract: The electric and/or electrical sensor or detector device is intended to cooperate with a movable element surrounded by a shell, it comprises an annular clamping collar adapted to be clamped in position on a shell and connected to at least one connecting conductor, the collar carrying at least one mechanical and electrical removable member for connection to a removable detector element and the device is applied to a position detector to be quickly and removably secured onto a fluid cylinder body.

Abstract: A pressure monitoring device isolator includes an annular member axially interposable in a pipeline for measuring the pressure of fluid in the pipeline. The annular member has an annular sensing fluid chamber, for a pressure sensing fluid, and an annular seal member separating the annular chamber from a central pipeline fluid passage. An opening in the outer periphery of the annular member is adapted to receive a pressure monitoring device. A sensing fluid passage extends radially inward from the pressure monitoring device opening. The sensing fluid passage is of substantially smaller volume than the sensing fluid chamber and the pressure monitoring device opening. A valve passage extends in from the periphery of the annular member to the annular sensing fluid chamber, meeting the sensing fluid passage at an acute angle. The valve passage has radially outer, middle and inner portions of progressively smaller cross sectional area. The inner portion joins the middle portion at an outward facing valve seat.

Abstract: A method and a device for measuring the pressure in a tubular body, for example, in the nozzle of a plastics injection molding machine, in the injection pumps of diesel engines, in gun barrels and the like, makes use of electromechanical transducers of piezoelectric, piezoresistive or strain gauge type to detect the radial and tangential mechanical stresses .sigma..sub.r, .sigma..sub.t in the tube cross section. The output signals s.sub.r, s.sub.t of the transducers are fed to a signal processing facility consisting of a subtraction circuit (for transducers of like polarity) or an addition circuit (for transducers of unlike polarity). The output signal of the signal processing facility is proportional to the difference between the pressures inside and outside the tubular body and may be fed to a further evaluation facility, such as a pressure display or process control device.

Abstract: A pipe pressure sensor (10) comprises a chamber holder (14) for defining a hollow chamber (28) which is urged toward a pipe (20) to clamp a diaphragm (16) between the pipe and a portion of the chamber holder surrounding a pressure-inlet opening (30) into the chamber. The diaphragm has a round, sensing, protrusion (42) with a sensing tip (46) on an outer end thereof for extending outwardly from one side of the diaphragm to extend through a round hole (44) in the pipe so as to communicate pressure in the pipe to the chamber.

Abstract: A transducer for detecting pressure changes in pipes by detecting deformation of the pipes and for converting the pressure changes in the pipes into electric signals uses a bimorph as a sensor element. This bimorph is pressed to the pipe surface by means of a holder. The transducer is free from complicated adjustment of the pressing force against the sensor element, very simple in structure, easy to adjust when mounting, light in weight so as to hardly influence an injection system, and less susceptible to effects of noise due to vibration.