Coriolis mass flowmeter

A mass flow, measuring instrument technology, used in mass flow measuring devices, direct mass flow meters, measuring flow/mass flow, etc., can solve problems such as changing installations, not significantly avoiding measurement signal deterioration, increasing costs, etc.

Active Publication Date: 2007-03-21
ENDRESS HAUSER FLOWTEC AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this is a very special solution which can only be realized in very limited cases, especially in measurement technology in industrial processes
On the one hand, in this case the pipe into which the measuring transmitter is to be installed may have to be fixed to the transmitter and not vice versa, which means additional costs for the user in creating th

Method used

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  • Coriolis mass flowmeter
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Examples

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Embodiment Construction

[0057] Fig. 1 is a perspective view of a Coriolis mass flow measuring instrument 1, which is used to detect the mass flow rate m of a medium flowing in a pipeline (not shown) and convert it into a mass flow measurement value X representing the mass flow rate instantaneously. m form of expression. The medium can be virtually any flowable material, such as liquid, gas, vapor, etc. In addition, the Coriolis mass flow measuring instrument 1 can also be used to measure the density ρ and / or viscosity η of the medium.

[0058]To this end, the Coriolis mass flow measuring device 1 comprises a vibrating-type measuring transmitter 10 through which the medium to be measured flows during operation, and a measuring device electronics 50 which communicates with the measuring device. The measuring transducer 10 is electrically connected. Figures 2-6 show transmitter embodiments and developments, while Figure 7 is a schematic example of the meter electronics. Preferably, the measuring inst...

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Abstract

The invention relates to a Coriolis mass flowmeter comprising a vibration-type measuring sensor (1) comprising at least one measuring tube (10) through which a medium can flow during operation. During operation, the measuring tube moves by mechanical vibrations, especially bending vibrations, by means of an exciter arrangement (40). The Coriolis mass flowmeter also comprises a sensor arrangement (50) for generating vibration measuring signals (sl, s2) representing inlet-side and outlet-side vibrations of the measuring tube (10). Flowmeter electronics (2) controlling the exciter arrangement generate an intermediate value (X'm) which is derived from the vibration measuring signals (s1, s2) and represents an uncorrected mass flow, and an exciter current (iexc) driving the exciter arrangement. An intermediate value (X2) is derived from the exciter current and/or from part of the exciter current (iexc), said value corresponding to a dampening of the vibrations of the measuring tube (11), dependent on an apparent viscosity and/or a viscosity-density product of the medium guided in the measuring tube (11). Furthermore, a correction value (XK) for the intermediate value (X'm) is generated using the intermediate value (X2) and a viscosity measuring value (Xeta) that is determined previously or during operation and corresponds to a viscosity of the medium guided in the measuring tube and/or a pre-determined reference viscosity. On the basis of the intermediate value (X'm) and the correction value (XK), the flowmeter electronics can then generate an accurate mass flow measuring value (Xm).

Description

technical field [0001] The invention relates to a Coriolis mass flow / density meter for in particular two-phase or multi-phase media flowing in pipelines and a method for generating measured values ​​representative of mass flow. Background technique [0002] In process measurement and automation technology, in order to measure the physical parameters of the medium flowing in the pipeline, such as mass flow, density and / or viscosity, such online measuring instruments, especially Coriolis mass flow measuring instruments, are often used. Vibration-type measuring transducers in a medium-conducting pipe through which the medium flows during operation and the measuring and operating circuits connected to it generate reaction forces in the medium, e.g. Coriolis force corresponding to mass flow, corresponding to density The inertial forces or frictional forces corresponding to the viscosity, etc., from which the measuring device obtains one or more measurement signals representing ...

Claims

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Application Information

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IPC IPC(8): G01F1/84G01F1/74G01F25/00G01N9/00G01N9/36G01N11/16
CPCG01F1/8418G01F1/8427G01F1/849G01F1/8422G01F1/74G01F1/8431G01F1/8409G01F25/0007G01F1/8436G01F1/8413G01F15/024G01N9/002G01F25/10
Inventor 沃尔夫冈·德拉赫姆迈克尔·富克斯阿尔弗雷德·里德汉斯-约尔格·斯普里希伊布·伊京萨穆尔·维斯
Owner ENDRESS HAUSER FLOWTEC AG
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