Abstract:
A mass flow sensor based on the Coriolis principle has a single helical measurement tube (13) that may be mounted for example by means of flanges (11, 12) in the path of a pipe having a given diameter (DN) through which the fluid to be measured flows and has largely balanced vibration modes independent from the density of the fluid, while maintaining its self-emptying capability in at least one mounting position. The vibrating part (13') of the measurement tube (13) is shaped as a circular cylindrical helix with a constant pitch and at least one winding. The corresponding end of an outer supporting tube (15) is secured to the measurement tube (13) next to the corresponding flange (11, 12) or to the corresponding flange itself. Only the corresponding end of an inner supporting element (14) is secured to the measurement tube (13) next to the corresponding flange (11, 12). Joining elements (16) that join the vibrating part (13') to the supporting element (14) are distributed along the vibrating part (13') and allow only those modes of vibration of the vibrating part (13') in which its centre line remains on the rest position cylindrical enveloping surface. Means are provided to excite the vibrating part (13') into resonant vibrations perpendicular to its centre line.
Abstract:
Die Erfindung betrifft eine Hybridelektrode (Fig. 1c) zum Einsatz in magnetisch induktiven Durchflussmessgeraten, dadurch gekennzeichnet dass die Hybridelektrode aus einem Grundkörper und einem Elektrodenkopf gefertigt ist, wobei der Elektrodenkopf mit einem Verfahren basierend auf selektivem Materialauftrag hergestellt ist und zumindest im Randbereich mit dem Grundkörper stoffschlüssig verbunden ist.
Abstract:
Die Erfindung betrifft ein elektronisches Gerät mit einem Gehäuse zur Aufnahme elektronischer Komponenten, vorzugsweise ein Prozesstransmitter, wobei das Gehäuse zwei Kammern (2, 3) aufweist, in denen elektronische Komponenten (4, 5, 6, 7, 8) und Benutzerschnittstellen (14, 15) und/oder Anschlusselemente (10, 11, 12, 13) für Kabel angeordnet sind, wobei die elektronischen Komponenten (4, 5, 6, 7) in einer ersten Kammer (2) angeordnet sind. Bei einem Prozesstransmitter, welcher einfach zu warten ist, sind in der ersten Kammer (2) ausschließlich elektronische Komponenten (4, 5, 6, 7, 8) angeordnet, während Benutzerschnittstellen (14, 15) der elektronischen Komponenten (4, 5, 6, 7, 8) und/oder Anschlusselemente (10, 11, 12, 13) für Kabel ausschließlich in der zweiten Kammer (2) positioniert sind.
Abstract:
Die Erfindung betrifft eine Schaltungsanordnung (1) zur Reduzierung der Verlustleistung bei einem aktiven Stromausgang (5) eines Feldgeräts zur Bestimmung und/oder Beeinflussung einer Prozessgröße, wobei die Prozessgröße über einen einstellbaren Stromwert (4-20mA) repräsentiert wird, mit einer externen Spannungsversorgung, einem Spannungsregler (4) und einem dem Spannungsregler (4) zugeordneten Regelkreis (7, 8, 9, 10), wobei der Regelkreis (7, 8, 9, 10) so ausgestaltet ist, dass der Spannungsregler (4) die Spannung einer parallel zu dem Stromausgang (5) geschalteten externen Last (6) in Abhängigkeit von dem aktuell eingestellten Stromwert (4-20mA) so regelt, dass der externen Last (6) im Wesentlichen nur die jeweils benötigte Spannung zur Verfügung steht.
Abstract:
The invention relates to a method for operating a modularly constructed automation technology field device, which has a number of exchangeable electronics modules M1, M2 and which comprises software functionalities that can be enabled via a security code SC. According to the invention, it is verified whether one of the modules has been exchanged and whether one of the modules has a valid security code. A valid security code exists if the stored value of the security code matches a value calculated from the serial number of the field device. If a plausible serial number and a valid security code exist in one of the modules, the software functionalities are enabled according to the valid security code(s) SC. If no plausible serial number exists, all software functionalities that can be enabled via security codes are blocked.
Abstract:
The invention relates to a method for transmitting measuring values between two measuring transducers (M1,M2) transmitting digital signals according to the master/slave principle, in addition to analog signals, to a control system acting as a master, via two communication links (KOM1,KOM2).The digital signals are also transmitted via an additional communication link (KOM3) between the two measuring transducers and the incoming digital signals are analyzed in the receiver- measuring transducer according to at least one characteristic value of the transmitting measuring transducer in order to ascertain the measuring values required for evaluation in the receiver-measuring transducer.
Abstract:
The invention relates to a thermal measurement device for determining and/or monitoring the mass flow of a fluid medium (3) through a pipeline (2) or through a measurement tube, comprising at least two temperature sensors (11, 12) and a regulation/analytical unit (10), both temperature sensors (11, 12) being resistance elements of which one is of a design which may be heated, both temperature sensors (11, 12) are arranged In a region of a housing (5) facing the medium (3) and are in thermal contact with the medium (3) flowing through the pipeline (2) or measuring tube. The regulation/analytical unit is provided with two differing precision resistances (R1, R2), the first precision resistance (R1) having a first defined value (Y1) and the second precision resistance (R2) having a second defined value (Y2), wherein the regulation /analytical unit (10) assigns a measured resistance (Rx1; Rx2) determined on a resistance element (11, 12) a measurement value (Y1; Y2) lying on a straight line (g) running through two calibration points ((R1, Y1), (R2, Y2)) provided by two precision resistances (R1,R2) and the regulation /analytical unit (10) determines the mass flow through the pipeline (2) or the measuring tube from the measured values (Y1,Y2) provided by the temperature sensors (11, 12).
Abstract:
The invention relates to a hybrid electrode (Fig. 1c) for use in magnetic-inductive flowmeters, characterized in that the hybrid electrode is fabricated from a base and an electrode head, wherein the electrode head is produced by a method based on selective material application and is integrally connected to the base body, at least in the edge region.