Abstract: A pressure sensor has a sensor element portion for detecting pressure, and a pressure conduction portion connectable to a detected member and defining therein a conduction passage for conducting pressure from the detected member to the sensor element portion. A protective cap is detachably attached to the pressure conduction portion to cover a sealed portion where the pressure conduction portion is to be sealed to the detected member until before the pressure sensor is connected to the detected member. The protective cap has an opening portion through which the conduction passage communicates with an outside thereof. Accordingly, pressure characteristics can be checked without detaching the protective cap from the pressure conduction portion.

Abstract: A pressure transducer calibration device is disclosed having a housing which defines a first and second chamber separated by a compliant barrier. Two ports are in fluid communication with the first chamber, and one port is in fluid communication with the second chamber. The first chamber is configured to be filled with fluid and connected, via a three-way stopcock, to a pressure monitoring line. The second chamber is configured to be connected in fluid communication with a pressure generation device. In operation, the transducer is isolated from the monitored pressure source. Fluid communication is established between the first chamber and the transducer. A known fluid pressure is applied to the second chamber such that the known fluid pressure is also applied to the first chamber through the compliant barrier. The pressure transducer is then calibrated based upon the known fluid pressure within the first chamber.

Abstract: The invention pertains to a pressure sensor for a pressure measuring transducer which contains a base body (3), and a pressure-sensitive measuring membrane (7). The membrane is located on the base body (3) and can be subjected to a measurable pressure. The first chamber (10) is arranged between the base body (3) and the measuring membrane (7) in order to protect the measuring membrane (7) if the pressure to be measured exceeds an upper pressure limit. A second chamber (11) is provided to protect the measuring membrane (7) if the pressure to be measured falls short of a lower pressure limit. The second chamber (11) is arranged between the measuring membrane (7) and a contact plate (5) The contact plate is situated on the side of the measuring membrane (7) opposite the base body (3). A bore (6) is provided for subjecting the measuring membrane (7) to pressure.

Abstract: A sensor capsule suitable for use in an industrial process fluid transmitter. The sensor capsule includes a block that has a sensor mounting hole. The block includes two half-blocks joined along mating surfaces passing lengthwise through the sensor mounting hole. A sensor has a sensor neck passing through the sensor mounting hole. The sensor neck is sealed to the sensor mounting hole.

Abstract: An environmentally sealed service block is mounted inside a field wiring compartment of a process fluid transmitter. The service block has field wiring terminals, sealed jumper assemblies and sealed pushbutton switches connected to a sealed cable and plug. The sealed plug plugs into a permanently sealed transmitter assembly. High impedance programming circuitry connected to the jumper assemblies and pushbutton switches is completely sealed and not subject to malfunction due to contamination present in the field wiring compartment.

Abstract: A cap body of a synthetic resin includes a cylindrical portion having an external thread formed on its outer peripheral surface, the cylindrical portion having at its lower end a shoulder or an annular groove for receiving an O-ring. The cylindrical portion has on its inner peripheral surface an annular, internally flanged valve stopper which provides a support for a locking rib of a pressure valve. The pressure valve includes deformation slits formed along the outer periphery of a pot-shaped valve body, and a seal plate disposed on the bottom surface of the valve body.

Abstract: A transducer protection device, particularly for hemodialysis processes, which comprises a first element and a second element made of plastics which are coupled coaxially with respect to a common axis and respectively comprise a first tubular connector and a second tubular connector which are blended with respective flanges which are coaxial to the common axis; the flanges are coupled to each other along their peripheral region by ultrasonic thermal bonding; the device has a recess formed frontally on a first one of the flanges, the recess being coaxial to the common axis and being suitable for accommodating, in a fixed arrangement, a semipermeable membrane by imbibition of melted plastics along a circular border region by the thermal bonding provided on a circular ridge which is shaped complementarily to the border region and protrudes frontally from the second flange so as to achieve bonding between the first and second flanges and the membrane.

Abstract: A process for the production of a device for measuring or detecting, particularly a probe or a detector, includes the steps of pre-mounting the different active components of the device, of which certain are ultimately gathered in functional subassemblies on and/or in a support body, then potting the pre-mounted resulting assembly, as well as its connection regions with a connection and/or supply cable, to form a substantially monoblock member and, finally, overmolding under pressure the potted member, as well as the proximal portion of the cable, with a thermoplastic material compatible with the resin used, to obtain an apparatus or instrument having the desired shape.

Abstract: A pressure sensor integrally formed in the shape of a beam around a central channel. The beam has an integral blind end that is pressurized by the fluid. The beam has an opposite end that is shaped to provide a stepped corner with a gap opening at the base of the stepped corner, where the gap and isolated from the fluid. A sensing film in the channel adjacent the blind end has an electrical parameter that varies with pressure and electrical leads that extend from the channel and out the gap. A seal fills the gap around the leads and the seal fills a portion of the stepped corner. The sensor is preferably formed by direct bonding of single crystal alumina layers. Applications include industrial pressure transmitters, aerospace and turbine engine pressure sensing.

Abstract: A component includes a housing (110, 1110) at least partially defining a cavity (125, 1125), a sensor element (105) located in the cavity, and a support member (340, 1140) located over the cavity, located over at least a portion of the housing, and having a hole (341, 1141) over the cavity. The component also includes a filter (345, 700, 800, 1045) located over the support member and located over the hole in the support member.

Abstract: A pressure detection apparatus is manufactured by fitting an end portion of a first case into an opening portion of a second case, filling a space, which is defined between the end portion of the first case and an opening edge portion of the second case, with adhesive, and hardening the adhesive. Accordingly, variations in volume of a pressure detection chamber sealed between the first case and the second case can be reduced, resulting in decreased variations in output.

Abstract: This invention provides a piezometric device to measure ground water having a fluid container in which the piezometric element is immersed so that it is permanently saturated. An opening above the level of the piezometric element allows fluid in a container to be retained and yet equalized with surrounding ground water to provide pressure readings. This avoids the device becoming unreliable should the water level fluctuate. A releasable seal may be placed over the opening into the container 2 to keep the fluid within the housing during transportation.

Abstract: A variable support mechanism includes a plurality of pneumatic bladders and an electronic control system for controlling the inflation and deflation thereof. Each of the bladders communicates through a valve with a common manifold. The operations of the valves are individually controlled by a microprocessor. A pressure sensor communicates with the manifold and generates electrical signals that are representative of the magnitude of the fluid pressure in the manifold to the microprocessor. The microprocessor is also connected to a vent valve that provides selective fluid communication between the manifold and the atmosphere. The microprocessor is further connected to a pressure valve that provides selective fluid communication between the manifold and a pump. Initially, the magnitude of the pressure in each of the bladders is sampled, measured, and stored by the electronic control system.

Abstract: A pressure sensor unit which comprises (i) a housing, (ii) pressure sensor members installed therein including a mount, the bottom of which is fixed to the inner base of the housing by means of an adhesive, a sensor chip firmly bonded to the top of the mount, terminals disposed on the inner base of the housing and bonding wires connecting the sensor chip to their respective terminals, and (iii) a sealant filling the housing so that all the pressure sensor members are completely buried therein; with the terminals being covered with a fluorinated polymer-containing composition functioning as adhesive in at least an upper part thereof and with the sealant being a fluorinated polymer-containing gel material, wherein the composition as adhesive is similar in fluorinated polymer to the gel material.

Abstract: In this flush-diaphragm relative pressure sensor (1), the reference air reaches its current dew point before getting into the interior of the housing. The sensor has a capacitive, resistive, or piezoelectric sensing element (2) with a diaphragm (21) an external surface of which comes into direct contact with a medium under pressure. A housing (7) has an interior space (71) and a front portion (72) open across the interior space in the vicinity of which the diaphragm closes the interior space such that the front portion projects beyond the diaphragm. Further, the housing has a bore (721) extending through the front portion from an outer side thereof to the interior space for guiding the reference air. The bore is closed from the outer side with an open-pore, highly heat-conducting and hydrophobic filter (8), so that the filter and the diaphragm are at the same or nearly the same temperature. The filter can be made of a sintered metal, e.g. high-grade steel or bronze, or of a metallic sponge, e.g.

Abstract: A pressure detection apparatus capable of preventing an O-ring, which is sandwiched by a first case and a second case, from being squeezed to a gap between the first case and the second case. A pressure detection apparatus is formed by assembling a connector case as the first case, which includes a depression portion in which a sensor element is contained, and a housing as the second case. The housing includes a main body portion having a pressure introduce hole. A seal diaphragm and a press member are welded to the main body portion. A pressure detection chamber for containing oil is defined between the depression portion of the connector case and the seal diaphragm. At an outer peripheral portion of the pressure detection chamber, an O-ring is inserted to a groove formed at one end surface of the connector case. An outer peripheral portion of groove portion is defined as an outer peripheral wall. A corner portion is defined by a side surface and a contact surface of the outer peripheral wall.

Abstract: Selective encapsulation of a micro electro-mechanical pressure sensor provides for protection of the wire bands (140) through encapsulation while permitting the pressure sensor diaphragm (121) to be exposed to ambient pressure without encumbrance or obstruction. Selective encapsulation is made possible by the construction of a protective dam (150) around the outer perimeter of a pressure sensor diaphragm (121) to form a wire bond cavity region between the protective dam (150) and the device housing (105). The wire bond cavity may be encapsulated with an encapsulation gel (160) or by a vent cap (170). Alternatively, the protective dam (150) may be formed by a glass frit pattern (152) bonding a cap wafer (151) to a device wafer (125) and then dicing the two-wafer combination into individual dies with protective dams attached.

Abstract: A pressure sensor includes a base unit, a cap-like metal container, and a flexible barrier diaphragm. A sensor chip is mounted on the base unit. The metal container is fixed to the base unit so as to seal the sensor chip. Oil is sealed in the metal container. The barrier diaphragm forms part of the metal container to transmit an external pressure by its displacement to the sensor chip through the oil. The base unit has a metal connector, a positioning glass member, an electrode pin, and a hermetic seal glass member. The positioning glass member is fitted in the metal connector and made of an insulating material. The electrode pin is supported to extend through the positioning glass member and electrically connected to the sensor chip through a bonding wire.

Abstract: A cap body 3 of a synthetic resin includes a cylindrical portion 7 having an external thread 10 formed on its outer peripheral surface, the cylindrical portion 7 having at its lower end a shoulder 11 or an annular groove 12 for receiving an O-ring. The cylindrical portion has on its inner peripheral surface an annular, internally flanged valve stopper 13 which provides a support for a locking rib 17 of a pressure valve 6. The pressure valve 6 consists of deformation slits 16 formed along the outer periphery of a pot-shaped valve body 14, and a seal plate 15 disposed on the bottom surface of the valve body 14.

Abstract: A hermetic media interface for a sensor package is disclosed. Preferably, the hermetic media interface is incorporated into a pressure sensor package for interfacing directly to fluid and/or gaseous media. In one embodiment, the pressure sensor package includes a semiconductor die and a pressure port that are housed in a pre-molded plastic package. A eutectic solder is coupled between the semiconductor die and the pressure port to solder the same to the semiconductor die. The semiconductor die may be metallized to enhance solderability. In an alternative embodiment, the pressure port is made from one or more plastic materials and the pressure port is attached to the semiconductor die with an adhesive. An integral stress-isolation region may optionally be incorporated on the semiconductor die.

Abstract: A method for the production of a separating diaphragm system as well as a separating diaphragm system for a pressure transducer is described. The system includes an inner body having a structured area with annular, wave crest-like elevations and wave trough-like depressions, with a separating diaphragm which is fixedly joined on the outside to the inner body via an annular connection point and with an outer pressure cap which is pressed against the separating diaphragm with interposition of a sealing ring. In order to be able to produce pressure transducers that have consistent measuring characteristics even with pressure changes, an inner body is used which is limited to the outside by a wave crest-like elevation; the pre-molded separating diaphragm is joined to the inner body with its collar so that it rests outside on the outer wave crest-like elevation, following which post-molding of the separating diaphragm is carried out and the pressure cap with the sealing ring is then attached.

Abstract: A measuring device is proposed to measure the gas pressure of an atmosphere, whereby the measuring device is provided with a sensor to measure the pressure located in the interior of a housing which encloses the sensor. In addition a unit to control the measuring device and to evaluate the signals as well as a supply unit are installed in this housing. The housing itself is sealed off against the surrounding atmosphere and is provided with contacts on the housing for the exchange of data between the measuring device and a unit for the evaluation of measured values connected to it. The contacts are provided at the same time to ensure that the unit for the evaluation of the signal of the pressure sensor can be supplied with control signals from outside the housing.

Abstract: A case of a pressure sensor has an atmospheric pressure introduction port for introducing atmospheric pressure into the case, and a water repellent filter that is attached to the atmospheric pressure introduction port to prevent passage of moisture, dust and the like while allowing flow of air. The filter is disposed to have a filter surface extending along a gravitational direction when the pressure sensor is used.

Abstract: A pressure transmitter apparatus having a unitary body portion, separate diaphragms and flange elements and disposed within the body, a first and second normally vertical pressure passage. The first and second pressure passageways communicate respectively between first and second pressure openings extending normally horizontally through the body portion, and a transducer mounting element. The mounting element, coupled to the body portion and located above the pressure passageways, mounts a transducer that generates a differential pressure signal. One or a pair of diaphragm elements are configured to form first and second process diaphragms, closing first and second pressure openings. The flange element overlies the diaphragm element and is removably and replaceably secured to the body portion.

Abstract: A sensor device (20) comprises a sensor package (22) having a cavity (24) formed therein, a sensor die (26) mounted on a bottom surface (28) of the cavity (24) and a protective coating (30) formed over the sensor die in the cavity. The protective coating (30) is formed from a material, preferably a polymer material, which is arranged to have a graduated cross-linking density such that the material at the top of the cavity (24) has a high density of cross-linking and the material at the bottom of the cavity (24), which material is in contact with the sensor die, has a low density of cross-linking.

Abstract: The invention concerns a membrane for a pressure sensor. The membrane has, on a flat central face (26), an annular attachment face (12), which is disposed concentric to the central face (26), and a non-flat connecting face (54), which links the central face (26) with the edge face (12). The connecting face (54) is formed from at least one annular step (36, 44, 52), which consists of one flat annular face (32, 40, 48) and one truncated-cone-shaped step face (30, 38, 46), which connects radially inward to the annular face. The annular faces (32, 40, 48) and the central face (26) lie in planes parallel to each other, whereby the heights (h1, h2, h3) of the step faces (30, 38, 46) measured perpendicular to the plane of the central face are very small in relationship to the width of the respective step. This stepped design of the membrane results in a high linearity of the characteristic of the membrane pressure sensor and at the same time to a steep slope of the characteristic in its linear region.

Abstract: A transducer pressure crystal having improved thermal coupling with the environment external to a pressure housing in which the crystal is disposed. A cylindrical major portion of the side wall of the pressure crystal is located immediately adjacent an inner wall of a chamber within the pressure housing, separated therefrom only by dimensional tolerances sufficient to ensure that the crystal is surrounded by pressure-transmitting fluid exposed to pressure from the external environment. The thermal time constant of the transducer for external temperature changes is significantly decreased. The time constant of the transducer for temperature changes in the pressure-transmitting fluid produced by rapid pressure changes is similarly decreased. A thin, electrically insulating element may optionally be disposed between the crystal side wall and the inner wall to preclude electrical grounding of the crystal to the housing.

Abstract: A pressure sensor system includes a first conductive surface electrically isolated from a second conductive surface. A dielectric material is interposed between the first conductive surface and the second conductive surface. The dielectric material is movable with respect to at least one of the first conductive surface and the second conductive surface in response to a change in pressure exerted on the pressure sensor. A measurement system is connected to at least one of the first conductive surface and the second conductive surface to measure the capacitance between the first conductive surface and the second conductive surface representative of pressure.

Abstract: A physiological pressure transducer is disclosed which can be adapted for multiple uses and which employs a low cost semiconductor strain gauge sensor. The transducer is connected to a fluid-filled catheter/manometer system for measuring pressures inside a living body in areas of medical interest such as the heart, brain, uterus, or the vascular system. The catheter is coupled to the pressure transducer through a unique, disposable dome containing a shaped, compliant isolation media which is in intimate contact with the transducer diaphragm. The complete assembly is adapted for use with standard catheter flushing solutions and flush devices. An improved method of drawing blood samples by using the features of the assembly is also described.

Abstract: A capacitive pressure sensor that uses polysilicon as an electrostatic bonding medium and as a lead transfer to make an electrical connection to an electrode within a vacuum sealed chamber. The heavily doped P++ region of a silicon wafer defines a movable diaphragm that is bonded to a glass substrate of the sensor. The diaphragm is one electrode of the capacitor and includes a recess that defines the sealed chamber. An internal electrode is patterned on the glass substrate in the sealed chamber, and is the other electrode of the capacitor. An internal lead within the chamber is electrically connected to the internal electrode and a polysilicon layer that seals the diaphragm electrode to the glass substrate. Dielectric isolation layers are provided to electrically isolate the polysilicon sealing layer in the diaphragm electrode, and isolate the polysilicon sealing layer from an etchant that removes a polysilicon region around the diaphragm electrode during fabrication.

Abstract: The pressure sensor is simplified in structure and its assembled state to the housing body is made more compact. In the semiconductor pressure sensor for detecting pressure of a pressure medium, the semiconductor pressure sensor has a semiconductor sensor element for pressure detection supported by a sensor body via a pedestal seat and is assembled to a housing body that partitions the pressure medium and outside from each other. The sensor body is formed into a plate shape of a specified thickness having a flange portion, where the pedestal seat for joining and supporting the semiconductor sensor element and an adjustment circuit board for the semiconductor sensor element are joined on one surface side of the sensor body. The sensor body is fixed by being inserted into a stepped through hole provided in the housing body.

Abstract: A process control instrument adapted to provide an output indicative of a parameter of a process fluid is disclosed. The process control instrument is designed to be attachable to a flange having a first passageway filled with process fluid. A body of the process control instrument has an opening adjacent to the first passageway adapted to receive process fluid from the first passageway. An isolation diaphragm is positioned in the opening of the body and separates the opening and the first passageway from a second passageway. A weld ring positioned in the opening is adapted to evenly distribute an attachment force across a support surface such that damage to the isolation diaphragm is minimized.

Abstract: A pressure transmitter includes an isolator mounting assembly for isolating process fluid from an interior cavity of the pressure transmitter. The isolator mounting assembly includes an isolator plug for receiving the process fluid line pressure and coupling the line pressure to a sensor cavity formed by a header joined to a distal end of the plug. A ring member is attached to the header and the distal end of the plug to reinforce the joint formed between the isolator plug and the head. In another embodiment, the isolator mounting assembly includes a base and a support having first and second opposed ends. The first end is rigidly bonded to the pressure sensor while an epoxy joint joins the second end of the support to the base.

Abstract: A pressure transmitter apparatus having a unitary body portion, separate diaphragms and flange elements and disposed within the body, a first and second normally vertical pressure passage. The first and second pressure passageways communicate respectively between first and second pressure openings extending normally horizontally through the body portion, and a transducer mounting element. The mounting element, coupled to the body portion and located above the pressure passageways, mounts a transducer that generates a differential pressure signal. One or a pair of diaphragm elements are configured to form first and second process diaphragms, closing first and second pressure openings. The flange element overlies the diaphragm element and is removably and replaceably secured to the body portion.

Abstract: To suppress the projection of an O ring when a plurality of O rings fitted onto a pipe are inserted into the respective O ring storage chambers of a cup, first and second O ring storage chambers corresponding to the plurality of O rings are formed in the cup, and the line diameter of an O ring which is inserted later is made larger than the line diameter of the O ring which is first inserted.

Abstract: The invention relates to an electronic component manufactured in thick film technology, thin film technology or silicon technology and then provided with an electrically insulating layer which is covered by an amorphous metal layer. The amorphous metal layer protects the component, even with the smallest of layer thicknesses, from external influences and directly transmits heating and force effects.

Abstract: A pressure gauge assembly is disposed between a pump which pumps a powder from a fluidized bed and a spray applicator which sprays the powder onto a workpiece such as a vehicle body moving along a painting line. The pressure gauge assembly provides and early warning of clogging in the pump and/or applicator.

Abstract: An electro-optical transducer connector assembly (10) including an electro-optical transducer (15), a transducer housing (25) having a connector portion (45) that extends through an opening (21) in a wall (12) of the enclosure (11) for an electrical apparatus (8), such as a computer. Transducer assembly (15) preferably is a transceiver which includes a laser diode/photo detector assembly (19) and a printed wiring assembly (17). An optical channel (23) having two fiber optic members (23a, 23b) is releasably mechanically connected by a first connector portion (43) and a second connector portion (45) telescoped inside the first connector portion (43) so as to optically align the fiber optic members (23a, 23b) with the transducer (15).

Abstract: A pressure sensor package is claimed. The pressure sensor package includes a pressure sensor base having a cavity, a pressure sensor diaphragm positioned over the cavity, and a pressure sensor cap positioned over and secured to the pressure sensor base. The pressure sensor cap further includes a deformed portion securing the cap to the base, an engaging portion adapted to allow engagement of the cap when the deformed portion is being deformed around the base, an upper portion between the engaging portion and the diaphragm, and a lower portion between the engaging portion and the deformed portion, wherein the upper portion is longer than the lower portion. The engaging portion may extend radially outwardly from the cap, such as in the form of an annular ledge.

Abstract: A physiological pressure transducer is disclosed which can be adapted for multiple uses and which employs a low cost semiconductor strain gauge sensor. The transducer is connected to a fluid-filled catheter/manometer system for measuring pressures inside a living body in areas of medical interest such as the heart, brain, uterus, or the vascular system. The catheter is coupled to the pressure transducer through a unique, disposable dome containing a compliant isolation media which is in intimate contact with the transducer diaphragm. The complete assembly is adapted for use with standard catheter flushing solutions and flush devices. An improved method of drawing blood samples by using the features of the assembly is also described.

Abstract: A membrane pressure sensor has an assembly comprising a thin membrane and a base, on which an annular joining face is formed. The membrane has a waved edge region in which numerous annular wave troughs and wave crests succeed one another alternatingly in the radial direction. The waved edge region of the membrane is attached to the joining face of the base. The wave crests of the edge region form numerous annular protrusions on the side turned away from the joining face, which permit a high sealing action when the assembly is connected with an annular flange having a measurement material space. When the joining face is flat, at least all wave troughs of the waved edge region of the membrane are circumferentially soldered to the joining face.

Abstract: A process control instrument adapted to provide an output indicative of a parameter of a process fluid is disclosed. The process control instrument is designed to be attachable to a flange having a first passageway filled with process fluid. A body of the process control instrument has an opening adjacent to the first passageway adapted to receive process fluid from the first passageway. A seal positioned in the opening and attached to the body at a seal outer diameter is adapted to prevent process fluid from leaking from the first passageway and the opening past the flange.

Abstract: A pressure transducer with a flame arrester has a header with a sensor mounted at a surface within a cavity in the header. A diaphragm in contact with the fluid media to be measured seals the cavity. A flame arrester is shaped for receipt in the cavity and is surrounded by fill fluid. The flame arrester provides a flame-extinguishing path between the flame arrester and surface within the cavity.

Abstract: A differential pressure transducer housing assembly comprising a sensor housing and a connectable cap member. The cap member includes an input port, a post and at least one coupling member. The sensor housing includes an opening for receiving the post of the cap member, and a bracket for engaging the coupling member. When the cap member is connected to the sensor housing, the coupling member and the bracket engage such that the cap member and the housing are fixed in register with respect to each other. Because the cap member is connectable to the sensor housing, numerous cap members having different input port orientations are possible, thus providing flexibility of design with respect to the entire sensor assembly.

Abstract: The service life of a sensor for the measurement of pressure in hot media which can be inserted in a measurement bore and which is provided with a force-, tension- or displacement-measuring sensor element as well as with a sensor membrane, which is connected with the sensor casing in a gas-tight manner and comprises a heat-insulating, flexible coating, is increased in such a way that the pressure sensor comprises a screen-like thermal protection element which is arranged at a small distance from the coating of the sensor membrane and rests on the sensor casing.

Abstract: A circular membrane diaphragm is edge-mounted on a generally cylindrical housing structure that allows the diaphragm to deform when a differential pressure is applied across it. The housing structure also supports a circular electrode in an internal chamber and in close proximity to the back surface of the diaphragm to form a variable capacitor. The outer side of the membrane is exposed to a second chamber defined by the housing structure and a cover. A tube connects the second chamber to a gas whose pressure is to be measured. The back of the housing structure is exposed to atmospheric pressure and other ambient atmospheric conditions. The housing structure is characterized by double flanges spaced axially by a deep lateral groove. A central cylindrical boss extends axially from the back side of the housing. The outer diameter B of the boss is at least equal to the diameter E of the groove. This housing structure provides the membrane with a high degree of isolation from external pressure fluctuations.

Abstract: A remote pressure or vacuum sensing device including a housing having first and second chambers separated by an internal wall, the first chamber being in fluid communication with a pressurized or vacuum environment to be monitored. An activator assembly is carried within the first chamber for axial movement therein between a terminal position and other positions in response to fluid communication of pressure or vacuum conditions of the monitored environment to a portion of said activator assembly. An activatable assembly is carried within the said second chamber for activation upon movement of the activator assembly from its terminal portion to other positions to provide signals for indicating pressure changes in the monitored environment.

Abstract: A process control instrument adapted to provide an output indicative of a parameter of a process fluid is disclosed. The process control instrument is designed to be attachable to a flange having a first passageway filled with process fluid. A body of the process control instrument has an opening adjacent to the first passageway adapted to receive process fluid from the first passageway. An isolation diaphragm is positioned in the opening of the body and separates the opening and the first passageway from a second passageway. A weld ring positioned in the opening is adapted to evenly distribute an attachment force across a support surface such that damage to the isolation diaphragm is minimized.

Abstract: Removable inserts are disclosed for positioning within a dialysis machine in order to connect a pressure transducer to external apparatus such as a drip chamber. The removable insert comprises a cup-shaped container adapted to be disposed within the dialysis machine with its open end aligned with the front face of the dialysis machine, a cover to cover the open end of the container, the cover including an orifice, a tube extending from the closed end of the cup-shaped container for communication with the pressure transducer, a filter positioned within the container, and a coupler for coupling the tube with the orifice in the cover with the filter interposed therebetween so that the pressure associated with the drip chamber can be monitored by the pressure transducer.

Abstract: The electronic instrument has a two-part housing (26, 27) which surrounds in a dusttight manner a printed board fitted with at least one electronic component. The housing (26, 27) contains a ventilating orifice (50) led through one of its two parts. A ventilating device (51) is arranged in this ventilating orifice (50), with an air-permeable diaphragm permeable to water vapor in a directionally dependent manner and with a splashwater guard preceding the diaphragm.Undesirable condensation water in the housing interior is avoided, since excess water vapor present in the housing interior is led outward through the diaphragm while the electronics are operating. At the same time, the splashwater guard prevents the diaphragm from coming into contact with splashwater and its operating capacity from being impaired.