Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Reexamination Certificate
2004-07-16
2008-03-11
Thompson, Jewel (Department: 2855)
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
Reexamination Certificate
active
07340963
ABSTRACT:
The invention relates to a magneto-inductive method for determining the flow rate of a medium flowing through a measuring tube in the direction of the measuring tube axis. In order to be able to detect a coating formation on a measuring electrode early and with a high degree of certainty, a test pulse (Up) of defined pulse length (tp) is issued to the measuring electrode; at least one signal in response to the test pulse (Up) is determined at at least two measuring points in time (t1, t2), wherein the measuring points in time (t1, t2) lie in a time window (tend-tbegin), which is so selected that no predictable disturbance signals occur on the measuring electrode in this time window (tend-tbegin). On the basis of the response signal determined in the measuring points in time (t1, t2), the relaxation time, or the length of time until the reaching of a predetermined state of discharge (Ui), of the measuring electrode is determined; on the basis of the determined relaxation time, or on the basis of the length of time until the reaching of the defined state of discharge (Ui), of the measuring electrode, a malfunctioning of the measuring electrode (3,4) is detected, or becomes detectable.
REFERENCES:
patent: 4409846 (1983-10-01), Ueno
patent: 4545257 (1985-10-01), Tomita
patent: 4676112 (1987-06-01), Uematsu et al.
patent: 102 43 748 (2003-04-01), None
patent: 1 108 988 (2001-06-01), None
patent: 2 348 011 (2000-09-01), None
patent: 59122914 (1984-07-01), None
patent: 01288724 (1989-11-01), None
Bacon & Thomas PLLC
Endress & Hauser Flowtec AG
LandOfFree
Method for magneto-inductive determination of the flow rate... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for magneto-inductive determination of the flow rate..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for magneto-inductive determination of the flow rate... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3973797