Coriolis mass flow meter having a thick-walled measuring tube

Details Coriolis mass flow meter having a thick-walled measuring tube Coriolis mass flow meter having a thick-walled measuring tube

1997-12-30

1999-06-29

Patel, Harshad

Measuring and testing

Volume or rate of flow

Mass flow by imparting angular or transverse momentum to the...

G01F 184

Patent

active

059182857

DESCRIPTION:

BRIEF SUMMARY
The invention concerns a mass flow meter for flowing media, which operates according to the Coriolis principle, with one at least essentially straight Coriolis measuring tube, with at least one oscillation generator acting on the Coriolis measuring tube, and with at least one sensor detecting Coriolis forces and/or Coriolis oscillations based on Coriolis forces.


BACKGROUND OF THE INVENTION

Mass flow meters for flowing media, which operate according to the Coriolis principle, are known in different designs (cf. e.g. German Patent Specification 41 24 295 and German Offenlegungsschrift 41 43 361 and the publications cited there in each case in column 1, lines 20 to 27, German Patent Specification 42 24 397 and the publications cited there in column 1, lines 23 to 30, as well as German Offenlegungsschrift 196 01 342) and have been increasingly used in practice for some time.
In the case of mass flow meters for flowing media, which operate according to the Coriolis principle, basically, there are, on the one hand, those whose Coriolis measuring tube is made at least essentially straight, as a rule exactly straight, and, on the other hand, those whose Coriolis measuring tube is made loop-shaped. In addition, in the case of the mass flow meters under discussion, there are, on the one hand, those which have only one Coriolis measuring tube and, on the other hand, those which have two Coriolis measuring tubes. In the case of the embodiments with two Coriolis measuring tubes, they can be hydraulically in series or parallel to one another.
Mass flow meters of the type in question, in the case of which the Coriolis measuring tube is, or the Coriolis measuring tubes are, made straight, with respect to their mechanical construction are simple and can consequently be produced at relatively low cost. In this case, it is also possible to finish or polish the inner surfaces of the Coriolis measuring tube or Coriolis measuring tubes well; they can be polished easily. In addition, they have a relatively low pressure loss. In the case of mass flow meters which operate according to the Coriolis principle, and whose Coriolis measuring tube is made straight, or the Coriolis measuring tubes are made straight, it can be disadvantageous that both thermally caused expansions or stresses, as well as forces and moments acting from outside, can lead to measurement errors and to mechanical damage, namely stress cracks.
The experts have already dealt with the above-mentioned problems in mass flow meters with straight Coriolis measuring tubes (cf. in particular German Patent Specification 41 24 295, German Offenlegungsschrift 41 43 361, and German Patent Specification 42 24 379). Altogether, a mass flow meter operating according to the Coriolis principle, with a straight Coriolis measuring tube, which has a measurement error of only about 0.1% (cf. the prospectus "Zulassung des Corimass G-Gerates zum eichpflichtigen Verkehr" of the KROHNE MeBtechnik GmbH & Co. KG), was made successfully.
Mass flow meters operating according to the Coriolis principle, which have only one straight Coriolis measuring tube, have considerable advantages as compared with those mass flow meters which have either two straight Coriolis measuring tubes or one loop-shaped Coriolis measuring tube. The advantage as compared with mass flow meters with two straight Coriolis measuring tubes in particular is to be seen in the fact that flow separators or flow combiners, which are required in the case of mass flow meters with two Coriolis measuring tubes, are not needed. The advantage as compared with flow meters with one loop-shaped Coriolis measuring tube, or with two loop-shaped Coriolis measuring tubes, in particular is to be seen in the fact that a straight Coriolis measuring tube is easier to produce than a loop-shaped Coriolis measuring tube, that the pressure drop in the case of a straight Coriolis measuring tube is less than in the case of a loop-shaped Coriolis measuring tube, and that a straight Coriolis measuring tube can be cleaned better than a loop-shaped

REFERENCES:
patent: 4949583 (1990-08-01), Lang et al.
patent: 5048351 (1991-09-01), Dames
patent: 5392656 (1995-02-01), Lew et al.
patent: 5398554 (1995-03-01), Ogawa et al.
Zulassung des Corimass G-Gerates zum eichpflichtigen Verkehr, Krohne Messtechnik GmbH & Co., KG (Mar. 22, 1994) 4 pages.

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