DE4242630C2 - Flow self-monitoring device and method - Google Patents

Flow self-monitoring device and method

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Publication number
DE4242630C2
DE4242630C2 DE19924242630 DE4242630A DE4242630C2 DE 4242630 C2 DE4242630 C2 DE 4242630C2 DE 19924242630 DE19924242630 DE 19924242630 DE 4242630 A DE4242630 A DE 4242630A DE 4242630 C2 DE4242630 C2 DE 4242630C2
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DE
Germany
Prior art keywords
flow
values
comparator
sensor
differential pressure
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 - Fee Related
Application number
DE19924242630
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German (de)
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DE4242630A1 (en
Inventor
Wolfgang Merkel
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Individual
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Individual
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Publication date
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Priority to DE19924242630 priority Critical patent/DE4242630C2/en
Publication of DE4242630A1 publication Critical patent/DE4242630A1/en
Application granted granted Critical
Publication of DE4242630C2 publication Critical patent/DE4242630C2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • G01F1/363—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 with electrical or electro-mechanical indication
    • 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
    • G01F1/50—Correcting or compensating means

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Description

Die Erfindung berifft eine Vorrichtung gemäß Oberbegriff des Patentanspruchs und ein Verfahren gemäß Oberbegriff des Patentanspruchs 3.The invention relates to a device according to the preamble of the claim and a method according to the preamble of claim 3.

Aus Druckschrift DE-OS 20 12 961, Fig. 1, mit zugehöriger Beschreibung ist ein Verfahren und eine Vorrichtung zur Durchflußsensorselbstüberwachung für einen Durchflußsensor (10) für Fluide mit einem Fluideinlaß (14) und einem Fluidauslaß (16), mit einem zwischen Fluideinlaß (14) und zwischen Fluidauslaß (16) installierten elektronischen Differenzdrucksensor (53) einem Komparator sowie einem Melder vorbekannt.From document DE-OS 20 12 961, Fig. 1, with the associated description, a method and a device for flow sensor self-monitoring for a flow sensor ( 10 ) for fluids with a fluid inlet ( 14 ) and a fluid outlet ( 16 ), with a between fluid inlet ( 14 ) and between the fluid outlet ( 16 ) installed electronic differential pressure sensor ( 53 ) a comparator and a detector.

Aus Druckschrift US 4 821 557 Fig. 1 und 2 mit zugehöriger Beschreibung ist ein Verfahren und eine Vorrichtung zur Durchflußsensorselbstüberwachung für einen Durchflußsensor (14) für Fluide mit einem Fluideinlaß und einem Fluidauslaß bekannt, wobei im Strömungsweg stromab des Durchflußsensors ein Ventil vorgesehen ist, der Druckabfall über dem Ventil gemessen und daraus ein Massendurchfluß berechnet wird, der mit dem vom Durchflußsensor gemessenen in einem Komparator (44) verglichen wird. Die Abweichung (Fehler) wird mit Block 54 gemeldet. ("downloaded").A method and a device for flow sensor self-monitoring for a flow sensor ( 14 ) for fluids with a fluid inlet and a fluid outlet are known from publication US Pat. No. 4,821,557, FIGS. 1 and 2, with a valve being provided in the flow path downstream of the flow sensor Pressure drop across the valve is measured and from this a mass flow is calculated, which is compared with that measured by the flow sensor in a comparator ( 44 ). The deviation (error) is reported with block 54. ( "Downloaded").

Aufgabe der Erfindung ist es, eine Vorrichtung und ein Verfahren zur Durchflußselbstüberwachung wie es aus der DE 20 12 961 A bekannt ist, zu vereinfachen.The object of the invention is a device and a method for Flow self-monitoring as is known from DE 20 12 961 A, too simplify.

Erfindungsgemäß wird eine Selbstüberwachung des Durchflußsensors (1) mit einem elektronischen Differenzdrucksensor (2) vorgenommen, dessen Meßwerte einen Lesespeicher (5) ansteuern, in dem die Durchflußwerte für die ursprünglichen Differenzdrücke abgelegt sind. Die aktuellen Meßwerte des Durchflußsensors (1) werden mit den aus dem Lesespeicher (5) ausgelesenen Durchflußwerten in einem Komparator (6) verglichen und der Ausgangszustand des Komparators (6) mit einem Melder (7) gemeldet. Mit einem Steuerglied (14) kann eine Toleranzschwelle als zulässiger Fehler zwischen dem aktuellen Durchflußwert des Durchflußsensors (1) und den ausgelesenen Durchflußwerten aus dem Lesespeicher (5) eingestellt werden.According to the invention, the flow sensor ( 1 ) is self-monitored with an electronic differential pressure sensor ( 2 ), the measured values of which control a read memory ( 5 ) in which the flow values for the original differential pressures are stored. The current measured values of the flow sensor ( 1 ) are compared with the flow values read from the read memory ( 5 ) in a comparator ( 6 ) and the initial state of the comparator ( 6 ) is reported with a detector ( 7 ). With a control element ( 14 ), a tolerance threshold can be set as a permissible error between the current flow value of the flow sensor ( 1 ) and the read flow values from the read memory ( 5 ).

Fig. 1 zeigt eine Realisierung für eine Durchflußsensorselbstüberwachung des Durchflußsensors (1) mit einem Differenzdrucksensor (2). Ein Oszillator (8) schaltet die Schalter (9, 10) im Takt, in der Weise, daß die analogen Meßwerte des Durchflußsensors (1) und des Differenzdrucksensors (2) über einen Analog- Digitalwandler (11) auf die Abtast-Halteschaltungen (12, 13) geschaltet werden. Die Abtast-Halteschaltung (12) steuert den Lesespeicher (5) an, dessen ausge­ lesene Werte mit den Werten der Abtast-Halteschaltung (13) in dem Komparator (6) verglichen werden, dessen Ausgangszustand mit dem Melder (7) gemeldet wird. Fig. 1 shows an implementation for a flow sensor self-monitoring of the flow sensor ( 1 ) with a differential pressure sensor ( 2 ). An oscillator ( 8 ) switches the switches ( 9 , 10 ) in time, in such a way that the analog measured values of the flow sensor ( 1 ) and the differential pressure sensor ( 2 ) via an analog-digital converter ( 11 ) to the sample and hold circuits ( 12 , 13 ) are switched. The sample-and-hold circuit ( 12 ) controls the read-only memory ( 5 ), the values read out are compared with the values of the sample-and-hold circuit ( 13 ) in the comparator ( 6 ), the initial state of which is reported by the detector ( 7 ).

Fig. 2 zeigt eine Realisierung der Durchflußselbstüberwachung mit zwei Analog- Digitalwandlern (12, 13). Fig. 2 shows a realization of the flow self-monitoring with two analog-digital converters ( 12 , 13 ).

Claims (4)

1. Vorrichtung zur Durchflußsensorselbstüberwachung für einen Durchflußsensor (1) für Fluide mit einem Fluideinlaß (4) und einem Fluidauslaß (3), mit einem zwischen Fluideinlaß (4) und Fluidauslaß (3) installierten elektronischen Differenzdrucksensor (2), einem Komparator (6) sowie einem Melder (7), dadurch gekennzeichnet, daß die durchflußabhängigen Diffenzdruckwerte des Diffenzdrucksensors (2) einen Lesespeicher (5) ansteuern und die ausge­ lesenen Durchflußwerte des Lesespeichers (5) nach einem Analog-Digitalwandler (11, 13) mit den aktuellen Durchflußwerten des Durchflußsensors (1) in dem Komparator (6) verglichen werden, dessen Ausgang auf den Melder (7) geschaltet wird.1. A device for Durchflußsensorselbstüberwachung for a flow sensor (1) for fluids having a fluid inlet (4) and a fluid outlet (3), with an installed between the fluid inlet (4) and fluid outlet (3) electronic differential pressure sensor (2), a comparator (6) and a detector ( 7 ), characterized in that the flow-dependent differential pressure values of the differential pressure sensor ( 2 ) control a read memory ( 5 ) and the read-out flow values of the read memory ( 5 ) according to an analog-digital converter ( 11 , 13 ) with the current flow values of the Flow sensor ( 1 ) are compared in the comparator ( 6 ), the output of which is switched to the detector ( 7 ). 2. Vorrichtung zur Durchflußsensorselbstüberwachung nach Anspruch 1, dadurch gekennzeichnet, daß der Komparator (6) hinsichtlich einstellbarer Fehlergrenzen zwischen den Durchflußwerten aus dem Lesespeicher (5) und den aktuellen Durchflußwerten des Durchflußsensors (1) programmierbar ist.2. Device for flow sensor self-monitoring according to claim 1, characterized in that the comparator ( 6 ) with respect to adjustable error limits between the flow values from the read-only memory ( 5 ) and the current flow values of the flow sensor ( 1 ) is programmable. 3. Verfahren zur Durchflußsensorselbstüberwachung für einen Durchflußsensor (1) für Fluide mit einem Fluideinlaß (4) und einem Fluidauslaß (3), mit einem zwischen Fluideinlaß (4) und Fluidauslaß (3) installierten elektronischen Differenzdrucksensor (2), einem Komparator (6) sowie einem Melder (7), dadurch gekennzeichnet, daß die durchflußabhängigen Diffenzdruckwerte des Differenzdrucksensors (2) einen Lesespeicher (5) ansteuern und die ausgelesenen Durchflußwerte des Lesespeichers (5) nach einem Analog-Digitalwandler (11, 13) mit den aktuellen Durchflußwerten des Durchflußsensors (1) in dem Komparator (6) verglichen werden, dessen Ausgang auf den Melder (7) geschaltet wird.3. A process for Durchflußsensorselbstüberwachung for a flow sensor (1) for fluids having a fluid inlet (4) and a fluid outlet (3), with an installed between the fluid inlet (4) and fluid outlet (3) electronic differential pressure sensor (2), a comparator (6) and a detector ( 7 ), characterized in that the flow-dependent differential pressure values of the differential pressure sensor ( 2 ) control a read memory ( 5 ) and the read flow values of the read memory ( 5 ) according to an analog-digital converter ( 11 , 13 ) with the current flow values of the flow sensor ( 1 ) can be compared in the comparator ( 6 ), the output of which is switched to the detector ( 7 ). 4. Verfahren zur Durchflußsensorselbstüberwachung nach Anspruch 3, dadurch gekennzeichnet, daß der Komparator (6) hinsichtlich einstellbarer Fehler­ grenzen zwischen den Durchflußwerten aus dem Lesespeicher (5) und den aktuellen Durchflußwerten des Durchflußsensors (1) programmierbar ist.4. A method for flow sensor self-monitoring according to claim 3, characterized in that the comparator ( 6 ) with respect to adjustable error limits between the flow values from the read memory ( 5 ) and the current flow values of the flow sensor ( 1 ) is programmable.
DE19924242630 1992-12-17 1992-12-17 Flow self-monitoring device and method Expired - Fee Related DE4242630C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19924242630 DE4242630C2 (en) 1992-12-17 1992-12-17 Flow self-monitoring device and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19924242630 DE4242630C2 (en) 1992-12-17 1992-12-17 Flow self-monitoring device and method

Publications (2)

Publication Number Publication Date
DE4242630A1 DE4242630A1 (en) 1994-05-26
DE4242630C2 true DE4242630C2 (en) 2002-09-26

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10255698B4 (en) * 2002-11-29 2021-06-24 Abb Ag Method for operating a flow measuring device
EP2103883B1 (en) * 2008-03-20 2010-12-08 Daikin Industries, Ltd. Heating and/or cooling installation and method for alternatively monitoring the operability of a flow switch in such an installation and of the installation
WO2013032801A1 (en) 2011-09-02 2013-03-07 First Solar, Inc. Feeder system and method for a vapor transport deposition system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1553489A (en) * 1967-02-16 1969-01-10
DE2012961A1 (en) * 1969-03-18 1970-09-24 Rotron Inc., Woodstock, N.Y. (V.St.A.) Method and device for checking the accuracy of a flow measuring device in operation
DE3003599A1 (en) * 1979-02-07 1980-10-09 Itt Ind Gmbh Deutsche MEASURING SYSTEM
DE3709776A1 (en) * 1987-03-25 1988-10-06 Eckardt Ag Method of measuring the flow of a medium through a pipeline or the like
US4821557A (en) * 1988-03-08 1989-04-18 Arkla, Inc. Method and apparatus for determining the accuracy of a gas flow meter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1553489A (en) * 1967-02-16 1969-01-10
DE2012961A1 (en) * 1969-03-18 1970-09-24 Rotron Inc., Woodstock, N.Y. (V.St.A.) Method and device for checking the accuracy of a flow measuring device in operation
DE3003599A1 (en) * 1979-02-07 1980-10-09 Itt Ind Gmbh Deutsche MEASURING SYSTEM
DE3709776A1 (en) * 1987-03-25 1988-10-06 Eckardt Ag Method of measuring the flow of a medium through a pipeline or the like
US4821557A (en) * 1988-03-08 1989-04-18 Arkla, Inc. Method and apparatus for determining the accuracy of a gas flow meter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JP 2-17419 A. In. Patents Abstracts of Japan, P-1028, March 28, 1990, Vol.14,No.160 *

Also Published As

Publication number Publication date
DE4242630A1 (en) 1994-05-26

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