CN1639546A - 用于测量浓度的科里奥利质量流量计 - Google Patents

用于测量浓度的科里奥利质量流量计 Download PDF

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CN1639546A
CN1639546A CN03805552.XA CN03805552A CN1639546A CN 1639546 A CN1639546 A CN 1639546A CN 03805552 A CN03805552 A CN 03805552A CN 1639546 A CN1639546 A CN 1639546A
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concentration
coriolis mass
measuring
measuring tube
mass flowmeters
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CN100335868C (zh
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克里斯蒂安·马特
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Endress and Hauser Flowtec AG
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/02—Compensating or correcting for variations in pressure, density or temperature
    • G01F15/022—Compensating or correcting for variations in pressure, density or temperature using electrical means
    • G01F15/024—Compensating or correcting for variations in pressure, density or temperature using electrical means involving digital counting
    • 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
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • 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
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • G01F1/8413—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments
    • 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
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • G01F1/8436—Coriolis or gyroscopic mass flowmeters constructional details signal processing
    • 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
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
    • G01F1/8468—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits
    • G01F1/849—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having straight measuring conduits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
    • G01N9/002—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis
    • G01N2009/006—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis vibrating tube, tuning fork

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Measuring Volume Flow (AREA)
  • Details Of Flowmeters (AREA)

Abstract

本发明涉及一种用于确定浓度的科里奥利质量流量计，其中将浓度函数存储在浓度计算单元(210)中。作为结果，用户可以根据介质的给定温度和密度得出其应用确定的浓度值。

Description

用于测量浓度的科里奥利质量流量计
本发明涉及一种用于测量浓度的科里奥利质量流量计。
科里奥利质量流量计用在许多情况下，用于测定管段中流体的质量流量。其中，流体流过至少一个振荡测量管。在大多数科里奥利质量流量计中，在测量管上排列一个振荡激励器和两个振荡传感器。振荡管和流体共同形成可振荡***，通常将该***激励至谐振频率。其中，谐振频率主要依赖于测量管的材料和尺寸。此外，谐振频率随流动流体的密度而改变。在某些情况下，不将测量管激励至谐振频率，而是激励至一邻近的频率。两个振荡传感器记录测量管在流动方向上彼此隔开的两个位置上的振荡运动并将测量管的振荡运动转换为传感器信号。两个传感器信号具有与测量管的振荡运动相同的频率，但它们在相位上相对彼此移位。两个传感器信号之间的相移是质量流速的量度。
该传感器信号在信号处理单元中被计算并转换为与质量流速成正比的信号。除质量流速之外，还可确定流体的其它性质，例如其密度。为了这个目的，计算测量管的振荡运动的频率并且如果需要的话，确定流动流体的温度。
由共有的专利申请DE 100 45 537中可知这样的科里奥利质量流量计。
溶液的浓度常常是工业过程中所关心的测量量。对于质量和体积浓度，还有各种工业特定浓度规格都是这样的，比如葡萄酒生产中的°Oechsle或啤酒酿造中的°Plato。在大多数情况中浓度测量的基本成分是流体的密度。相应地，各种密度函数，例如°Brix，°Plato，°Balling，°API，已经在Endress+Hauser公司的科里奥利质量流量计Promass 63和Promass 83中实现了。
但是，各种浓度测量说明未在文献中清晰地定义。不同用户应用不同的定义，从而导致了不同的浓度值。
在现有科里奥利质量流量计的情况下，不同浓度值的输出仅在某些条件下是可能的。
本发明的目的是提供用于浓度测量的科里奥利质量流量计，其易于制造并且成本很低。
通过如权利要求1所定义的用于浓度测量的科里奥利质量流量计实现该目的。
由从属权利要求给出本发明的有益的进一步发展。
本发明的本质思想是在用于测量浓度的科里奥利质量流量计中提供一个单元，其中存储可预先确定的浓度曲线。
接下来将基于实施例的实例更详细地解释本发明，如下面附图所示：
图1是科里奥利质量流量计的变送器的示意图；并且
图2是具有浓度确定单元的科里奥利质量流量计的信号处理单元的框图。
图1是科里奥利质量流量计的变送器1的示意图。将变送器1放置于一未示出更多细节的管道中。流体F在该管道中流动。流体的质量流速是所关心的参数之一。通过两个法兰2，3与该管道连接。
变送器1包括单独的直的测量管4，测量管4的入口末端由端板13固定在法兰2上，并且其出口末端由端板14固定在法兰3上。
法兰2，3和端板固定在支承管15上或支承管15中。
为使测量管振荡，将振荡激励器16放置在两端板13，14之间的测量管4的中部。振荡激励器16可以是，例如，由永磁铁161和线圈162组成的电磁驱动。将线圈162固定到管15，并将永磁铁固定到测量管4。发生在附图平面上的测量管4的弯曲振荡的幅度和频率由在线圈162中流动的电流控制。
当流体F流过测量管4时，科里奥利力出现在附图平面上。该力的结果是测量管4的所有点不再同相振荡。
在同样放置于支承管上且在振荡激励器16两端近似对称的两个振荡传感器17，18的帮助下接收测量管4的振荡运动。振荡传感器17，18可以是，例如，结构类似于振荡激励器16的电磁转换器。
将两个永久性磁铁171，181固定到测量管4并将两个线圈172，182固定于支承管15。测量管4的运动使得磁铁171，181在相关联的线圈171，181中感生电压，将该电压分别作为模拟传感器信号X17，X18分接。
两个温度传感器20，19用于检测流体的温度。温度传感器19位于端板13上，温度传感器20在支承管15上。
将变送器1连接至数字信号处理单元200。该信号处理单元200在其输出中提供流动流体F的质量流速、密度和温度的测量值。
图2是和变送器1相关联的信号处理单元的框图。其中，它计算传感器信号X17，X18并调节测量管4的振荡激励。将两个传感器信号X17，X18分别馈入第一放大器V1和第二放大器V2。放大器V2的增益是可通过可调的放大系数改变的。
将放大器V1连接至A/D转换器AW1和与AW1并联的差动级D1。将放大器V2连接至差动级D1的第二输入。将差动级D1的输出连接至第二A/D转换器AW2。A/D转换器AW1和AW2的两个输出分别提供数字形式的传感器信号S1和差动信号D。将两个输出连接至信号处理单元200的各个输入。
同样，将两个温度传感器19和20连接至信号处理单元200的各个输入。
信号处理单元以公知的方式分别在多个输出A1，A4和A5提供流体F的质量流速，密度和温度的值。此外，信号处理单元200控制驱动测量管4的振荡激励的激励电流和放大器V2的放大系数VF。
信号处理单元另外连接至浓度确定单元210。在浓度确定单元210中，计算流体的密度和温度。该浓度确定单元210连接至用于显示所需浓度值的显示单元AE。除在显示单元AE中表示浓度值，还可将浓度值传输至上级计算单元(未示出进一步细节)。
浓度确定单元210存储了作为流体密度和温度的函数的浓度曲线C。流体的当前密度值和当前温度的输入使得可以很容易地确定所需浓度。
存储浓度曲线的一种可能性是存储相应的多项式系数。用户提供特定密度和温度值下的浓度值，并导出相应的多项式近似，可以很容易地确定该多项式系数。
在最简单的情况中，其涉及一个二维多项式。
c ( ρ , υ ) = Σ i = 0 M a ρ i + Σ i = 1 Z b υ i
优选的，密度多项式的多项式次数是M＝4，温度多项式的多项式次数Z＝3。
通过输入不同的浓度值，用户可以产生适合于个人应用的浓度规格。

Claims (3)

1.一种用于浓度确定的科里奥利质量流量计，包括从变送器的传感器信号和温度信号确定流动流体的密度的数字信号处理器200和连接在其后的存储浓度曲线的浓度计算单元210。
2.如权利要求1所述的科里奥利质量流量计，其中，该浓度曲线是作为二维多项式存储的。
3.如权利要求2所述的科里奥利质量流量计，其中，该密度项次数是4并且该温度项次数是3。
CNB03805552XA 2002-03-08 2003-02-26 用于测量浓度的科里奥利质量流量计 Expired - Fee Related CN100335868C (zh)

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DE10210061A DE10210061A1 (de) 2002-03-08 2002-03-08 Coriolis-Massedurchflußmesser zur Konzentrationsmessung
DE10210061.6 2002-03-08

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CN104132700A (zh) * 2014-07-01 2014-11-05 宁波摩米创新工场电子科技有限公司 一种高频科氏质量流量计数字信号处理***
CN105579840A (zh) * 2013-07-19 2016-05-11 高准公司 在确定工艺材料浓度时自动切换参照模型

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DE102019134600A1 (de) * 2019-12-16 2021-06-17 Endress + Hauser Flowtec Ag Messaufnehmer und Coriolis-Messgerät

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CN105579840A (zh) * 2013-07-19 2016-05-11 高准公司 在确定工艺材料浓度时自动切换参照模型
CN104132700A (zh) * 2014-07-01 2014-11-05 宁波摩米创新工场电子科技有限公司 一种高频科氏质量流量计数字信号处理***

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WO2003076879A1 (de) 2003-09-18
CA2477798A1 (en) 2003-09-18
EP1485681A1 (de) 2004-12-15
RU2285245C2 (ru) 2006-10-10
US20050228598A1 (en) 2005-10-13
CN100335868C (zh) 2007-09-05
US7188035B2 (en) 2007-03-06
DE10210061A1 (de) 2003-10-09
AU2003206959A1 (en) 2003-09-22
JP2005519297A (ja) 2005-06-30

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