# Title (en)

METHOD FOR MEASURING A MASS FLOW RATE AND CORRESPONDING DETECTOR

# Title (de)

VERFAHREN ZUM MASSEDURCHFLUSS-MESSEN UND ENTSPRECHENDE AUFNEHMER

# Title (fr)

PROCEDE DE MESURE DE DEBIT-MASSE ET CAPTEUR CORRESPONDANT

# Priority

• EP 99917901 A
• EP 9902134 W
• EP 98106146 A

# Abstract (en)

[origin: WO9951946A1] The invention relates to a method which applies the clamp-on construction principle to coriolis-type mass flowmeters and detectors. A first and a second decoupling body (4, 5; 4', 5') with identical masses are fixed on a pipeline or a meter tube (1', 10, 10', 10'') at a distance L away from each other in order to define the segment of tube (11; 11'; 11'') which will form the measuring section. The masses of said decoupling bodies are significantly greater than the mass of the tube segment. For two meter tubes, clamping bodies (111, 112; 111', 112') are used. An exciter arrangement (12) is mounted in the centre of the tube segment. This exciter arrangement causes the tube segment to vibrate, the vibrations being of a third vibration mode with a frequency (f) of between 500 Hz and 1000 Hz. The distance L is calculated according to the following formula: L = 5,5 . 2<1/2> . (2 pi f)<-1/2> . {E(r<4>a-r<4>i)/(dM + dF)}<-1/4>, (ra,ri = the outer or inner diameter of the tube segment, E = the elasticity modulus of the tube segment, dM = the density of the material of the tube segment multiplied by its cross-sectional area, dF = the average density of the fluid multiplied by the cross-sectional area of the clear width of the tube segment). Two sensor elements (13, 14) are fixed on the tube segment at the point where a deformation of the tube segment resulting from the interference from the pipeline during excitation in the third vibration mode has a first or a second zero point.

# IPC 8 full level (invention and additional information)

G01F 1/84 (2006.01)

# CPC (invention and additional information)

G01F 1/8409 (2013.01); G01F 1/8413 (2013.01); G01F 1/8418 (2013.01); G01F 1/8422 (2013.01); G01F 1/849 (2013.01); G01F 1/8495 (2013.01)

# Citation (search report)

See references of WO 9951946A1

# Designated contracting state (EPC)

CH DE DK ES FR GB IT LI NL

# 2010-03-24[18D] DEEMED TO BE WITHDRAWN

- Effective date: 20091001

# 2008-02-13[17Q] FIRST EXAMINATION REPORT

- Effective date: 20080111

# 2000-08-23[17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000624

# 2000-03-22[AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): CH DE DK ES FR GB IT LI NL