Endress + Hauser Gmbh + Co. Kg

Endress+hauserse+co. Kg

Other

Endress+hauser Gmbh+co.

Envec Mess- Und Regeltechnik Gmbh + Co.

Andreas Rossberg

Elke Maria Schmidt

Ulfert Drewes

Nils Ponath

Frank Hegner

Thomas Uehlin

Anh Tuan Tham

Andrea Berlinger

Thomas Velten

Michael Philipps

Markus Rettenmayr

Peter Siegmund

Sergej Lopatin

Michael Kirst

Raimund Becher

Dietmar Birgel

Michael Hugel

Ingolf Voigt

Olaf Textor

Jan Schleiferböck

Elmar Wosnitza

J&uuml;rgen Breme

Detlef Schleiferböck

Peter Selders

Henry Ludwig

Simon Pauly

Bernhard Walter

Barbel Voigtsberger

Yanli Wang

Jonas Conradt

Martin Burgard

Jan Schleiferbock

Drewes Ulfert

Jorg Muller

Marco Doms

Sabine Stolle

Uta Kuhn

Christel Kretschmar

Melanie Hentsche

Uta KÜHN

A pressure measuring device includes a ceramic pressure sensor and a process connection, the pressure sensor including a measuring membrane. The pressure measuring device further includes a carrier made of titanium and having a free-standing tubular carrier region running parallel to the surface normal onto the measuring membrane and having an end region adjacent the process connection connected to the process connection and an end region opposite the process connection to which the pressure sensor is fastened by a jointing that connects an outer edge of a front face of the pressure sensor to the end region of the carrier opposite the process connection and carries the pressure sensor.

Pressure measuring device with free-standing carrier

A pressure measuring device includes a ceramic pressure sensor including a ceramic measuring membrane and a sensor mounting configured to secure the pressure sensor such that a membrane region of the measuring membrane surrounded by a membrane edge is contactable with a medium having a pressure to be measured. The sensor mounting includes a titanium or titanium alloy mounting element including an opening through which the membrane region is contactable with the medium. The membrane edge is connected directly with the mounting element by a diffusion weld produced by a diffusion welding method.

Pressure measuring device having a membrane edge and mounting element connected by a diffusion weld

A pressure sensor comprising two parts connected with one another via an active braze joint manufactured by active hard soldering, or brazing, with an active hard solder, or braze, especially a pressure contactable, pressure-dependently elastically deformable, measuring membrane, especially a ceramic measuring membrane, and a platform, especially a ceramic platform, which are connected by an active braze joint connecting an outer edge of the measuring membrane (which covers a pressure chamber with an outer edge of an end of the platform facing the measuring membrane, whose measuring characteristics are improved in that the active braze joint has a coefficient of thermal expansion dependent on the dimensions of the active braze joint and on the materials of the parts and matched to a coefficient of thermal expansion of at least one of the parts, especially the measuring membrane.

Pressure sensor having a joint of active braze

A pressure measurement cell comprises: a ceramic counter body; a ceramic measuring diaphragm which is joined in a pressure-tight manner with the counter body, creating a measurement chamber between the counter body and the measuring diaphragm, by means of a circumferential joint. The measuring diaphragm can be deformed by a pressure to be measured; an electrical converter for converting a pressure-dependent deformation of the measuring diaphragm into an electrical signal; and a temperature transducer for providing at least one electrical signal dependent on a temperature or on a temperature gradient of the pressure measurement cell. The temperature transducer comprises at least one first thermocouple having a galvanic contact between a first conductor with an electrically conductive material and a second conductor with at least one second electrically conductive material.

Ceramic pressure measurement cell having at least one temperature transducer and pressure sensor having a pressure measurement cell of this type

An active brazing material for the energy-efficient production of active-brazed connections that consists of layer sequences arranged on top of one another, the layer sequences of which consist of layers arranged on top of on another, the layer sequences of which each comprise at least one layer of brazing material, wherein the layers of brazing material of each layer sequence each contain at least one component of a base active braze and, in conjunction with each other, contain all components of the base active braze, the layer sequences of which each comprise at least one first reaction layer consisting of a first reactant to which at least one second reaction layer is directly adjacent in the active brazing material and consists of a second reactant that exothermally reacts with the first reactant, wherein an enthalpy of formation of the exothermic reaction of the reactants is greater than or equal to 45 kJ/mol&#x2014;in particular, greater than or equal to 50 kJ/mol.

Active brazing material and method for active brazing of components

A pressure measurement cell is disclosed including a base body, substantially cylindrical at least in sections, a measuring membrane joined to the base body in a pressure-tight manner along a perimeter joint to form a measurement chamber between the base body and the measuring membrane, and a joining material that joins the perimeter joint between the base body and the measuring membrane. The base body and/or the measuring membrane have/has a stepped recess into which the joining material is at least partially disposed, the stepped recess structured to yield a minimum distance between the base body and the measuring membrane.

Pressure measurement cell

A method for producing a connection between two surfaces or surface sections of two ceramic parts comprises: provision of a first ceramic part and of a second ceramic part; provision of an active brazing solder material on at least one surface section of at least one of the ceramic parts; and heating the active brazing solder in a vacuum brazing process. The whole active brazing solder material is provided for connecting the first and the second ceramic part by a sputtering method, wherein at least one surface section of at least one of the ceramic parts, preferably of the two ceramic parts, is layered with a layer sequence of individual components of the active brazing solder material, wherein the average strength of the layers of an individual component of the active brazing solder is no more than 0.5%, in particular not more than 0.2%, preferably not more than 0.1% and especially preferably not more than 0.05% of the strength of the joining region.

Method for producing a connection between two ceramic parts&#x2014;in particular, of parts of a pressure sensor

A versatilely usable pressure sensor is described, which has a ceramic pressure measuring cell () clamped in the pressure sensor with interpositioning of a seal () outwardly sealing an interior of the pressure sensor and loadable via an opening () of the pressure sensor with a pressure (p) to be measured, and whose seal () comprises a film () of a thermoplastic material, especially polytetrafluoroethylene (PTFE), clamped (in an axial direction and extending perpendicularly to planes of the sealing surfaces ()) between a form-retaining, planar sealing surface () of the pressure measuring cell () and a form-retaining sealing surface (') of a counterbody (&#x2032;) outwardly surrounding the opening (), characterized in that the film () includes a first film segment (), which is clamped between the sealing surface () of the pressure measuring cell () and the sealing surface (&#x2032;) of the counterbody (), and the film () includes a second film segment (), which extends over a lateral surface () of the counterbody (&#x2032;) different from the sealing surface (&#x2032;), and which is connected with the counterbody (&#x2032;) on the lateral surface () via a connecting layer () of a material serving as bonding agent for the material of the film (), especially perfluoroalkoxy-polymer (PFA), arranged on the lateral surface ().

Pressure sensor

A pressure sensor comprising: a solid metal sensor body, having a front region and a base adjoining thereto, which has an outer edge, which can be clamped by means of a fastening device; a recess, which is provided in the front region and is open towards a front side of the front region that faces away from the base; a metal measuring diaphragm, to which a pressure is applied from outside during measurement operation and which can be deformed elastically depending upon the pressure, is arranged on the front side of the sensor body, closes off the recess from the outside, and is spaced apart from the outer edge of the front region; and an electromechanical transducer for detection, by means of measuring the pressure-dependent deformation of the measuring diaphragm, having at least one measuring element, which is electrically insulated from the measuring diaphragm and the sensor body by means of an insulating element.

A pressure measurement cell, comprising: a ceramic measurement membrane and a ceramic counterpart. The measurement membrane is joined to the counterpart in a pressure-tight manner forming a pressure chamber between the measurement membrane and the counterpart by means of an active brazing solder. The pressure measurement cell furthermore has a solder stop layer on a surface of the measurement membrane and/or the counterpart, wherein the solder stop layer has a metal oxide or a reduced form of the metal oxide. The metal oxide has at least one oxidation stage, which, assuming an activity coefficient of R=1 at an inverse temperature of 8&#xb7;10/K, has an oxygen coexistence decomposition pressure of not less than 1MPa (10bar) and not more than 1MPa (10bar) and which, assuming an activity coefficient of R, at an inverse temperature of 9&#xb7;10/K has an oxygen coexistence decomposition pressure of not less than 1MPa (10bar) and not more than 1MPa (10bar). Suitable metal oxides are, for example, oxides of chromium, tungsten or titanium.

Ceramic pressure measurement cell and method for production thereof

A differential pressure measuring cell comprises a measuring membrane; two opposing bodies; and one converter. The measuring membrane is arranged between the opposing bodies and is connected in a pressure-tight manner to the two opposing bodies, forming in each case one measuring chamber. The opposing bodies each have a pressure duct through which a pressure can be made to act upon the respective measuring chamber. The converter is provided in order to convert a deformation of the measuring membrane, which deformation is dependent upon a difference between the pressures, into an electrical signal; wherein the opposing bodies each have a chamber section oriented toward the measuring membrane and a rear wall section oriented away from the measuring membrane with, between these, a decoupling chamber. The chamber sections each have an equalizing duct between the measuring chamber and the decoupling chamber, wherein the decoupling chamber has a diameter that is at least as large as the diameter of the measuring chamber.

Differential pressure measuring cell

A method for connecting a component to a support via soldering between a first contact surface of the component and a second contact surface of the support. The method is distinguished by features including that at least one spacer is embodied in such a manner and arranged between the first contact surface and the second contact surface that the first contact surface and the second contact surface are spaced from one another, and that the soldering is executed in such a manner that the component and the support are connected with one another via the first contact surface and the second contact surface. Also claimed is a component connectable with a support via soldering is intended.

Method for connecting a component to a support via soldering and component connectable with a support

A pressure sensor comprises a deformable measuring diaphragm, and a mating body connected in a pressure-tight manner and forms a measuring chamber in which a reference pressure is present. A pressure can be applied to an outside of the measuring diaphragm. The pressure sensor has a capacitive transducer having at least one mating body electrode and at least one diaphragm electrode. Above a pressure limit value for the pressure, at least one central surface section of the measuring diaphragm rests against the mating body with a contact surface area, the size of which is dependent on the pressure. The pressure sensor also has a resistive transducer for converting a pressure-dependent deformation of the measuring diaphragm, when pressed in a range of values above the pressure limit value, into an electrical signal using an electrical resistance which is dependent on the contact surface area of the measuring diaphragm on the mating body.

Multilevel pressure sensor

A pressure sensor comprises an operating circuit and a pressure-measuring cell comprising a counter body, a measurement membrane, which is arranged on the counter body and can be deformed by a pressure to be measured, and a capacitive transducer, which has at least one membrane electrode arranged on the measurement membrane and at least one counter-body electrode arranged on the counter body. The capacitance between the membrane electrode and the counter-body electrode depends on a pressure-dependent deformation of the measurement membrane, wherein at least the membrane electrode has a temperature-dependent impedance. The operating circuit is designed to sense at least one capacitance between the at least one counter-body electrode and the at least one membrane electrode and to provide a pressure measurement value on the basis of at least one capacitance and to determine the impedance of the membrane electrode&#x2014;particularly, the ohmic portion of the impedance of the membrane electrode.

Capacitive pressure-measuring cell having at least one temperature sensor and pressure measurement method

A pressure-measuring cell having a ceramic measuring membrane and a ceramic counter body, wherein the measuring membrane is joined to the counter body in such a way that a pressure chamber is formed between the measuring membrane and the counter body. The pressure-measuring cell also has a capacitive transducer for detecting a pressure-dependent deformation of the measuring membrane, which capacitive transducer has at least one membrane electrode arranged on the measuring membrane and at least one electrode on the counter body side, wherein according to the invention at least one membrane electrode comprises a titanium oxide.

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Bad Sackingen, Germany

Andreas Rossberg