Abstract: The invention relates to a pressure gauge having a cylindrical housing to which a bushing is fixed, which penetrates the housing. The pressure gauge is furthermore provided with a pressure sensor together with an allocated electronic evaluation unit, said sensor is operatively connected to a pressure port coaxially positioned to the longitudinal axis of the housing. A turnable adjustment pin to engage with an adjustment device of the electronic evaluation unit in the pressure gauge is accommodated in the bushing in a liquid-proof manner, and is equipped with holding means by means of which it is undetachably secured to the bushing.

Abstract: A fluid detection device is herein disclosed as including a sensor mount, a flexible deflection sensor rigidly connected to the sensor mount and a stiffener. The stiffener is arranged together with the flexible deflection sensor such that the flexible deflection sensor is preconfigured to deform in a predetermined manner when the fluid detection device is exposed to a fluid. An amount of the deformation of the flexible deflection sensor determines a property of the fluid. A pressure sensing apparatus is herein disclosed as including a rigid perimeter, a flexible membrane forming a surface area bounded by the perimeter, and a sensing means in communication with the flexible membrane. The flexible membrane is configured to elastically deform when a pressure force is exerted on the surface area, and the sensing means is configured to measure an amount of deformation of the flexible membrane.

Abstract: The present disclosure provides for systems and methods for fabricating suspended movement measuring devices, e.g., a pressure gauge, thermometer or the like. More particularly, the present disclosure provides for systems and methods for fabricating suspended movement measuring device assemblies having span adjustment. In one embodiment, the present disclosure provides for systems and methods for fabricating suspended movement measuring device assemblies having span adjustment, wherein the measuring device may be calibrated from the front of the dial of the measuring device.

Abstract: In a pressure gauge containing a suspended movement, apparatus for effecting post assembly linearity adjustment of the gauge by displacing the underend of an elongated actuator pin rectilinearily parallel to the axis of the inlet socket on which the pin is firmly but not securely held. Located opposite the under end of the actuator pin is a lateral recess defined in the sidewall of the socket and into which a hand tool can be inserted for gripping and effecting a leveraged displacement of the pin.

Abstract: A pressure gage device having a pressure gage with a double function. On the one hand it serves for conventional display of pressure and on the other hand it furthermore renders possible a variable setting of the displayed pressure.

Abstract: A refrigerant monitoring set includes a manometer and at least one transparent disk configured to be detachably mounted on the manometer. The manometer includes a manometer face having a pressure scale thereon, and a housing defining an outer window side and including a window at the outer window side thereof, the manometer face being disposed in the housing such that the pressure scale is visible through the window of the housing. The disk is configured to be detachably mounted on the housing at the outer window side thereof by being pressed onto the housing. The disk further has a temperature scale thereon corresponding to a predetermined refrigerant, and is further rotatable with respect to the housing after it has been mounted thereon for achieving a zero position alignment of the temperature scale on the disk and the pressure scale on the manometer face for correlating the temperature scale to the pressure scale.

Abstract: A device is presented for measuring residual stresses in a solid component. he device includes a hardness measuring component which has an indenter for determining hardness at various locations. Stress (.sigma.) data is obtained by converting the hardness measurements according to the formulaa.multidot.[.sqroot.4P.sub.o.sup.2 -3P.sup.2 -P],where a is a constant in Kbar.sup.-1 mm.sup.2 /kg, which depends on the type of material under test and also on the type of indentor used, where the pressure p is measured in kg/mm.sup.2, and where the average pressure p.sub.o is the average value of mean pressure p along a radial cut line of the solid component specimen.

Abstract: A novel pressure transducer apparatus for medical pressure monitoring apparatus having a housing with a calibration port. The patient side of the transducer senses fluid pressures to be monitored. The non-patient side of the transducer is hermetically sealed in the housing of the apparatus. The housing has a female calibration port communicating, via a pinhole, with the non-patient side of the transducer. The non-patient side of the transducer can thus alternatively be vented to atmospheric pressure or be exposed to a vacuum calibration pressure.

Abstract: A bourdon gauge having a connection piece at the end of a bourdon tube for pivotably urging a link which in turn is connected to the arced arm of a sector plate. One end of an adjustment plate is frictionally secured and urged by an adjustment screw near the elbow of an arced arm which is on one end of the sector plate. The other end of the adjustment plate has a slot for slidably urging a rivet to move therein and simultaneously allowing the adjustment plate to turn so as to rotate the sector plate, hence allowing for adjustment of a pointer axle and needle of the bourdon gauge.

Abstract: Sensitivity or span calibration is adjusted to a desired value by (1) noting the display indication with the reference side of the transducer at atmospheric pressure, (2) substituting a known offset pressure for atmospheric pressure on the reference side, to produce a new display indication, and (3) adjusting the display to produce that amount of displacement (between the display indications in steps 1 and 2) which corresponds to the known offset pressure multiplied by the desired calibration value.With the sensitivity or span calibration adjusted to a desired value, the zero point of the display is adjusted by (1) independently measuring the mean of the actual pressure, (2) noting the mean value of the display indication, and (3) adjusting the zero point to eliminate discrepancy between the mean value of the display and the mean of the actual pressure.

Abstract: A pressure transducer which includes a novel apparatus and method for calibrating a pressure transducer to a monitor used in connection with an indwelling catheter to monitor a patient's blood pressure. The pressure transducer includes a transducer diaphragm disposed within a housing cavity. A manometer and a syringe are connected so as to be in communication with the transducer cavity. By partially withdrawing the plunger of the syringe, the pressure in the transducer cavity is reduced, thereby establishing a pressure drop equal to that measured by the manometer across the transducer diaphragm, thus facilitating calibration of the pressure measurement system. Inasmuch as the indwelling catheter is isolated from the pressure calibration apparatus, the methods and apparatus of the present invention avoid any risk of introducing air bubbles or microorganisms into the indwelling catheter.

Abstract: The disposable transducer includes a small housing constructed of lightweight plastic material. The housing is shaped so as to form a transparent chamber within which is situated a very small piezoresistive strain gauge in the form of a resistive bridge network diffused onto a semiconductor substrate. The semiconductor substrate is electrically isolated by means of a nonconductive gel which partially fills the transparent chamber in which the semiconductor substrate is positioned. The resistive bridge network of the semiconductor substrate is also electrically connected to a plurality of calibration resistors which are separately formed on the semiconductor substrate, making the entire apparatus economically disposable after a single use.

Abstract: A pressure gauge having a rotatably secured Bourdon tube, and a dial plate arcuately displaceable for effecting zero calibration of the gauge includes a rotationally presettable key for registered placement within a key-slotted receptacle in which the gauge is to be utilized. Keying is provided by a simulated Y-shaped washer mounted in an annular groove on the gauge stem and arcuately secured post-calibration at a predetermined angular setting from a reference point on the gauge dial.

Abstract: An elongated actuator pin in a pressure gauge extends from a fixed end to a free end to interact with the amplifier for enabling pivotal motion thereof to translate Bourdon displacement to an output pointer. A clamp slideably mounted on the actuator pin is operatively effective when set at a selected location along the pin length to variably offset the free end of the pin from its longitudinal axis for obtaining correct calibration adjustment of the gauge.

Abstract: Amplifier apparatus for providing output motion correlated to condition change motion or deflection of a condition responsive element. The amplifier in a preferred embodiment is mounted onto the condition responsive element for floating conjoint movement therewith. A remotely connected actuator, extending into the motion path, defines a pivot axis for a hinged gear sector arm of the amplifier. In pivoting about the actuator axis, the sector arm operably drives a rotatable output shaft supporting a pointer or the like.

Abstract: A pressure measuring sub-assembly for a pressure gauge is comprised of a Bourdon tube providing total support for the gauge amplifier operably connected to drive an output pointer shaft. Th sub-assembly can be installed as a unit in a gauge housing providing a self-supporting inlet connection for the Bourdon tube.In a preferred embodiment, the amplifier is supported on the displacement portion of the Bourdon tube and in the process of manufacture a swageable clamp is loosely placed near the fixed end of the Bourdon tube to loosely receive the secureable end of an elongated wire actuator. The opposite actuator end extends into the motion path of the amplifier to define a pivot axis therefor. When calibrating the unit for linearity, the Bourdon tube is first pressurized to one-half of rated operating capacity, and while maintaining calibration pressure the clamp is subjected to a bi-directional swaging force which selectively crimps the clamp to secure it to the Bourdon tube and the actuator to the clamp.

Abstract: Excess pressure being supplied to a pressure gauge is controllably relieved through the gauge cavity and an unsealed aperture in a spring-like crystal. A sleeve member extends transversely in a forced engagement between the inside face of the crystal and an annular gasket compressed in surrounding relation about the inlet of the Bourdon tube. The gasket normally seals the passage clearance about the tube inlet against supply pressure leakage therepast but in response to an overpressure is displaced inwardly toward the cavity until leakage can occur. Concomitant displacement of the sleeve member deflects the crystal outwardly a like amount afforded by its spring rate matched in correlation with the maximum anticipated overpressure to be provided for.

Abstract: A depth gauge, of the type having a dial with a graduated scale over which an indicator needle is movable by a manometer unit housed in a capsule filled with liquid which communicates ambient pressure to a pressure-sensitive element of the manometer, in which there are provided calibration means for adjusting the pressure within the capsule with respect to the external ambient pressure in order to adjust the needle setting to zero immediately prior to use. The capsule may have one or two flexible walls and the calibration means include a screw threaded element, which may be part of a casing for the capsule or may be screwed into a part of this casing, which engages the resiliently flexible wall and causes flexure of it one way or the other when screwed in one direction or the other, to increase or reduce the pressure in the liquid filling the capsule with respect to the external ambient pressure.

Abstract: The floating amplifier of a pressure gauge is mounted onto the free end of the Bourdon tube at various effective spacings therefrom correlated to offset any residual tip travel of the individual Bourdon tube.

Abstract: Pointer zero adjustment in a pressure gauge is effected by means of a shaft (50) centrally extending laterally inward of the casing from a supportive centering flange (40) on the inside face of the crystal (10). A Bourdon tube (44) is radially coiled concealed from view through the crystal (10) about a pressure sealed rear portion of the shaft (50) to which it is rotationally secured. The pointer unit (42) is of a more or less U-shaped cross section with a tubular center (48) loosely supported on the shaft (50) juxtaposed to the crystal (10). The front pointer formation (42) simulates a conventional pointer appearance while its rear formation (52) is rotatably linked to the free end (56) of the Bourdon tube for incurring operational displacement therewith. On removing a detachable cover (37) from over an aperture (34) in the crystal coincidingly located opposite the shaft end thereat, access is provided for an external tool (78) to operationally engage a tool receiving hex socket (38) in the shaft end.

Abstract: The disposable transducer includes a small housing constructed of lightweight plastic material. The housing is shaped so as to form a transparent chamber within which is situated a very small piezoresistive strain gauge in the form of a resistive bridge network diffused onto a semiconductor substrate. The semiconductor substrate is electrically isolated by means of a nonconductive gel which partially fills the transparent chamber in which the semiconductor substrate is positioned. The resistive bridge network of the semiconductor substrate is also electrically connected to a plurality of calibration resistors which are separately formed on the semiconductor substrate, making the entire apparatus economically disposable after a single use.