DE474394C - Device for zero checking of measuring instruments with a square character - Google Patents

Device for zero checking of measuring instruments with a square character

Info

Publication number
DE474394C
DE474394C DEH107935D DEH0107935D DE474394C DE 474394 C DE474394 C DE 474394C DE H107935 D DEH107935 D DE H107935D DE H0107935 D DEH0107935 D DE H0107935D DE 474394 C DE474394 C DE 474394C
Authority
DE
Germany
Prior art keywords
measuring instruments
square character
measuring
zero
zero checking
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
DEH107935D
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Training Center GmbH and Co KG
Original Assignee
Hartmann and Braun AG
Publication date
Priority to DEH107935D priority Critical patent/DE474394C/en
Application granted granted Critical
Publication of DE474394C publication Critical patent/DE474394C/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/37—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction the pressure or differential pressure being measured by means of communicating tubes or reservoirs with movable fluid levels, e.g. by U-tubes
    • G01F1/377—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction the pressure or differential pressure being measured by means of communicating tubes or reservoirs with movable fluid levels, e.g. by U-tubes using a ring-balance as indicating element

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)

Description

Einrichtung zur Nullprüfung von meßinstrumenten mit quadratischem Charakter Bei Meßgeräten mit quadratischem Zusammenhang zwischen Zeigerausschlag und Richtkraft, z. B. solchen, die zur Messung ven Strömung.sgeschwindigkeite.n mittels des Differenzdruckes an einer S.tauvörrIchtung verwendet werden, ist die Nullpunktprüfung sehr schwierig. Die quadratische Beziehung zwischen Differenzdruck und Zeigerausschlag hat zur Folge, daß in der Nullnähe das Gerät unempfindlich wird, weil der Theorie nach eine unendlich kleine Kraft schon einen endlichen Zeigerausschlag hervorrufen soll. ' Die Erfindung bezieht sich besonders auf solche Geräte mit quadratischem Charakter, welche aus einem Meßurgan und einer wurzelziehenden, kraftschlüssigen Übertragung bestehen, z. B. einer hydrostatischen Ringwaage mit einer Kurvenscheibe und Fühlhebel, und sie besteht darin, daß eine besondere Ausrückvorrichtung vorgesehen ist, die es gestattet, die kraftschlüssige Verbindung der Übertragung zu lösten, s,o@ daß das Meßorgan reibungsfrei auf die KontroUstellung einspielen kann.Device for zero testing of measuring instruments with a square Character For measuring devices with a quadratic relationship between the pointer deflection and straightening force, e.g. B. those that are used to measure ven Strömung.sverkehre.n can be used by means of the differential pressure on a defrosting device, is the Zero point check very difficult. The quadratic relationship between differential pressure and pointer deflection has the consequence that the device becomes insensitive in the vicinity of zero, because according to the theory an infinitely small force already has a finite pointer deflection should evoke. 'The invention relates particularly to such devices with square Character, which consists of a measuring organ and a root-pulling, non-positive one Transfer exist, e.g. B. a hydrostatic ring balance with a cam and sensing lever, and it consists in that a special release device is provided which allows the frictional connection of the transmission to be broken, s, o @ that the measuring element can smoothly play into the control.

In der Zeichnung ist ein Ausführungsbeispiel dargestellt, bei welchem das Meßorgan als Ringwaage tv ausgebildet ist. Auf dieser sitzt eine Kurvenscheibe k, gegen welche sich die Roller eines Fühlhebels h legt. Auf der Achse des Fühlhebels h sitzt ferner ein Hebell, der durch Drehung des auf der Achsea sitzenden Düppelhebels d von dem Stift s nach hinten gedrückt werden kann, so daß sich die Rolle r des Fühlhebels h von der Kurvenscheibe k abhebt. Dadurch ist die X-raftschlüssigkeit zwischen Ringwaage und Zeiger ausgeschaltet, und es kann sich die Ringwaage frei einstellten, so daß an der Stellung des Zeigers m2 gegenüber dem Zeiger nzl die genaue Nullage nachgeprüft werden kann.In the drawing, an embodiment is shown in which the measuring element is designed as a ring balance tv. On this sits a cam disk k, against which the roller of a feeler lever h rests. On the axis of the feeler lever h there is also a lever which can be pushed backwards by the pin s by turning the chaff lever d on the axisea, so that the roller r of the feeler lever h lifts off the cam disk k. As a result, the X-force fit between the ring balance and pointer is switched off, and the ring balance can freely adjust itself, so that the exact zero position can be checked at the position of the pointer m2 in relation to the pointer nzl.

Claims (1)

PATENTANSPRUCH: Einrichtung zur Nullprilfung von Meßinstrumenten mit quadratischem Charakter, welche aus einem Meßorgan und einer wurzelziehenden, kraftschlüssigen Übertragung, insbesondere seiner hydrostatischen Ringwaage und einer Kurvenscheibe mit Fühlhebel bestehen, gekennzeichnet durch -eine besondere Ausrückvorrichtung, die gestattet, die kraftschlüssige Verbindung der Übertragung zu Iösen, so daß das Meßorgan reibungsfrei auf dis Kentrollstsllung reinspielen kann.PATENT CLAIM: Device for zero testing of measuring instruments with square character, which consists of a measuring organ and a root-pulling, non-positive Transmission, especially its hydrostatic ring balance and a cam with a feeler lever, characterized by -a special release device, which allows the frictional connection of the transmission to be broken, so that the Measuring element can play in without friction on the Kentrollstsllung.
DEH107935D Device for zero checking of measuring instruments with a square character Expired DE474394C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEH107935D DE474394C (en) Device for zero checking of measuring instruments with a square character

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH107935D DE474394C (en) Device for zero checking of measuring instruments with a square character

Publications (1)

Publication Number Publication Date
DE474394C true DE474394C (en) 1929-03-30

Family

ID=7170425

Family Applications (1)

Application Number Title Priority Date Filing Date
DEH107935D Expired DE474394C (en) Device for zero checking of measuring instruments with a square character

Country Status (1)

Country Link
DE (1) DE474394C (en)

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