US2012123705A1PendingUtilityA1
Measuring system having a measuring transducer of vibration-type
Est. expiryNov 11, 2030(~4.3 yrs left)· nominal 20-yr term from priority
G01F 1/8413G01F 1/8436G01F 15/022G01F 1/8472G01F 1/84G01F 1/8431G01F 1/8495G01F 1/849G01F 1/8477G01F 1/8409
47
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Claims
Abstract
A measuring system comprises: a measuring transducer; transmitter electronics; at least one measuring tube; and at least one oscillation exciter. The transmitter electronics delivers a driver signal for the at least one oscillation exciter, and for feeding electrical, excitation power into the at least one oscillation exciter. The driver signal, has a sinusoidal signal component which corresponds to an instantaneous eigenfrequency, and in which the at least one measuring tube can execute, or executes, eigenoscillations about a resting position. The eigenoscillations have an oscillation node and in the region of the wanted, oscillatory length exactly one oscillatory antinode. The driver signal has, a sinusoidal signal component with a signal frequency, which deviates from each instantaneous eigenfrequency of each natural mode of oscillation of the at least one measuring tube, in each case, by more than 1 Hz and/or by more than 1% of said eigenfrequency.
Claims
exact text as granted — not AI-modified1 . A measuring system for flowing media, especially media flowing in pipelines, which measuring system comprises:
a measuring transducer of a vibration-type, through which, during operation, a medium flows, especially a gas and/or a liquid, a paste or a powder or some other flowable material, said measuring transducer serving to produce oscillation signals corresponding to media parameters of the flowing medium, especially mass flow rate, density and/or viscosity; as well as, electrically coupled with the measuring transducer; and transmitter electronics for activating said measuring transducer and for evaluating oscillation signals delivered from said measuring transducer, said measuring transducer includes: at least one measuring tube, especially a V shaped, U shaped or straight, measuring tube, which extends with a wanted, oscillatory length between an inlet-side, first measuring tube end and an outlet-side, second measuring tube end, which has a plurality of natural oscillation modes, and which serves for conveying flowing medium; at least one oscillation exciter, especially an electrodynamic, oscillation exciter, for converting electrical, excitation power into vibrations of said at least one measuring tube, especially in such a manner that said at least one measuring tube, at least partially, and/or, at least at times, executes oscillations about a resting position with an instantaneous eigenfrequency of a natural mode of oscillation of said measuring tube; and at least one oscillation sensor, especially an electrodynamic, oscillation sensor, for registering vibrations, especially inlet-side or outlet-side vibrations, of said at least one measuring tube and for producing an oscillation signal of said measuring transducer representing vibrations, especially inlet-side or outlet-side vibrations at least of said at least one measuring tube; and said transmitter electronics delivers a driver signal for said at least one oscillation exciter serving for feeding electrical, excitation power into said at least one oscillation exciter, consequently for effecting vibrations of said at least one measuring tube, in such a manner, wherein: the driver signal has, at least at times, a sinusoidal signal component of the first type, especially a sinusoidal signal component of the first type having a plurality of oscillation periods, with a signal frequency, which corresponds to an instantaneous eigenfrequency, of a natural mode of oscillation of the first order of said at least one measuring tube, in which said at least one measuring tube can execute, or executes, eigenoscillations about a resting position, which eigenoscillations have in the regions of said first and said second measuring tube ends, in each case, an oscillation node and in the region of the wanted, oscillatory length exactly one oscillatory antinode; said at least one measuring tube, excited by said at least one oscillation exciter, executes, at least partially, especially predominantly, resonance oscillations, namely oscillations with an oscillation frequency, f drv,I =f 1 , corresponding to the instantaneous eigenfrequency, f 1 , of the mode of oscillation of the first order; and said at least one oscillatory signal has, at least at times, a sinusoidal signal component of the first type, especially a sinusoidal signal component of the first type having a plurality of oscillation periods, with a signal frequency, f sens,I , which corresponds to the signal frequency, f drv,I , of the signal component (s drv,I ) of the first type of the driver signal (s drv ), consequently the instantaneous eigenfrequency, f 1 , of the mode of oscillation of the first order; and the driver signal (s drv ) has, at least at times, a sinusoidal signal component (s drv,II ) of the second type, especially a sinusoidal signal component of the second type instantaneously dominating as regards signal power and/or having a plurality of oscillation periods, with a signal frequency, f drv,II , which deviates from each instantaneous eigenfrequency of each natural mode of oscillation of said at least one measuring tube, in each case, by more than 1 Hz, especially more than 10 Hz, and/or by more than 1%, especially more than 10%, of said eigenfrequency, whereby said at least one measuring tube, excited by said at least one oscillation exciter, executes, at least partially, forced oscillations outside of resonance; and the at least one oscillatory signal, at least at times, has a sinusoidal signal component of the second type, especially a sinusoidal signal component of the second type having a plurality of oscillation periods, with a signal frequency, which corresponds to the signal frequency, of the signal component of second type of the driver signal (s drv ), consequently not an instantaneous eigenfrequency of some natural mode of oscillation of said at least one measuring tube.
2 . The measuring system as claimed in claim 1 , wherein:
said transmitter electronics, by means of the signal component (s sens1,II ) of the second type of the at least one oscillation signal (s sens1 ), generates a system status report (Sys fail ), especially a system status report in the form of an alarm, which signals, especially visually and/or acoustically perceivably, a deviation exceeding a predetermined measure of tolerance by the measuring system from a reference state ascertained earlier therefor, especially in a calibrating and/or at a start-up of the measuring system, especially a deviation related to aging of the measuring system and/or related to loadings of the measuring transducer irreversibly changing an oscillatory behavior of said at least one measuring tube and/or related to thermal loadings of said measuring transducer changing an electrical impedance and/or an electro-mechanical transducer constant of said at least one oscillation exciter and/or related to thermal loadings of said measuring transducer changing an electrical impedance and/or an electro-mechanical transducer constant of said at least one oscillation sensor.
3 . The measuring system as claimed in claim 1 , wherein:
said transmitter electronics, by means of the signal component of the second type of the at least one oscillation signal, generates a system status report (Sys fail ), especially a system status report in the form of an alarm, which signals, especially visually and/or acoustically perceivably, wear of said measuring tube exceeding a predetermined measure of tolerance.
4 . The measuring system as claimed in claim 3 , wherein:
the deviation signaled by the system status report results from the fact that a deposit has formed clinging to an inner surface of said measuring tube contacted by the medium to be measured during operation; and/or that structural integrity of said at least one measuring tube is no longer assured, especially as a result of material removal and/or as a result of overloading and/or as a result of crack formation and/or as a result of material fatigue.
5 . The measuring system as claimed in claim 1 , wherein:
said transmitter electronics, by means of the signal component (s sens1,II ) of the second type of the at least one oscillation signal (s sens1 ), generates a system status report, especially a system status report in the form of an alarm, which signals, especially visually and/or acoustically perceivably, that structural integrity of said at least one measuring tube is no longer assured, especially as a result of material removal and/or as a result of overloading and/or as a result of crack formation and/or as a result of material fatigue.
6 . The measuring system as claimed in claim 1 , wherein:
said transmitter electronics, by means of the signal component (s sens1,II ) of the second type of the at least one oscillation signal (s sens1 ), generates a system status report, especially a system status report in the form of an alarm, which signals, especially visually and/or acoustically perceivably, that a deposit has formed clinging to an inner surface of the measuring tube contacted by medium to be measured during operation.
7 . The measuring system as claimed in claim 1 , wherein:
said transmitter electronics, by means of the signal component (s sens1,II ) of the second type of the at least one oscillation signal (s sens1 ), generates a system status report, especially a system status report in the form of an alarm, which signals, especially visually and/or acoustically perceivably, a removal of material of said measuring tube exceeding a predetermined measure of tolerance.
8 . The measuring system as claimed in claim 1 , wherein:
said transmitter electronics, by means of the signal component (s sens1,II ) of the second type of the at least one oscillation signal (s sens1 ), generates a system status report, especially a system status report in the form of an alarm, which signals, especially visually and/or acoustically perceivably, crack formation in said at least one measuring tube.
9 . The measuring system as claimed in claim 1 , wherein:
said transmitter electronics, by means of the signal component (s sens1,II ) of the second type of the at least one oscillation signal (s sens1 ), generates a system status report, especially a system status report in the form of an alarm, which signals a change of the oscillation characteristics of said at least one measuring tube exceeding a predetermined measure of tolerance, especially as a result of deformation and/or as a result of material removal and/or as a result of crack formation and/or as a result of material fatigue.
10 . The measuring system as claimed in claim 1 , wherein:
said transmitter electronics, by means of the signal component (s sens1,II ) of the second type of the at least one oscillation signal (s sens1 ), generates a system status report, especially a system status report in the form of an alarm, which signals, especially visually and/or acoustically perceivably, a change of an electrical impedance of said measuring transducer exceeding a predetermined measure of tolerance.
11 . The measuring system as claimed in claim 1 , wherein:
said transmitter electronics, by means of the signal component (s sens1,II ) of the second type of the at least one oscillation signal (s sens1 ), generates a system status report, especially a system status report in the form of an alarm, which signals, especially visually and/or acoustically perceivably, a change of an electrical impedance and/or an electro-mechanical transducer constant of said at least one oscillation exciter and/or an electrical impedance and/or an electro-mechanical transducer constant of said at least one oscillation sensor, exceeding a predetermined measure of tolerance.
12 . The measuring system as claimed in claim 1 , wherein:
said transmitter electronics, by means of the signal component (s drv,II ) of the second type of the driver signal, especially based on an electrical current (i drv,II →s drv,II ) flowing in said at least one oscillation exciter and serving as signal component of the second type of the driver signal (s drv ), or a voltage (u drv,II →s drv,II ) driving such and serving as a signal component (s drv,II ) of the second type of the driver signal (s drv ), and by means of the signal component (s sens1,II ) of the second type of the at least one oscillation signal (s sens1 ), especially based on a voltage (u sens1,II ) generated by means of said at least one oscillation sensor and serving as signal component (s sens1,II ) of the second type of the oscillation signal (s sens1 ) and/or based on a phase difference of the signal component of the second type of the oscillation signal relative to the signal component of the second type of the driver signal, detects, whether, and/or to what extent, the measuring system, in comparison to a reference state ascertained earlier therefor, especially in a calibrating and/or at a start-up of the measuring system, is changed, especially as a result of aging and/or as a result of loading of said measuring transducer, especially in such a manner that a system parameter, measured value for at least one system parameter characterizing the measuring system and ascertained during operation of the measuring system based on the signal component (s drv,II ) of the second type of the driver signal (s drv ) and/or based on the signal component (s sens1,II ) of the second type of the at least one oscillation signal (s sens1 ), deviates from a system parameter, reference value ascertained in the reference state of the measuring system for said system parameter by more than a predetermined measure of tolerance, especially by more than 0.1% of said reference value.
13 . The measuring system as claimed in claim 1 , wherein:
said transmitter electronics sets the signal frequency of the signal component of the second type of the driver signal as a function of the signal component of the first type of the driver signal and/or as a function of the signal component of the first type of the oscillation signal, especially in such a manner that said transmitter electronics sets the signal frequency of the signal component of the second type of the driver signal in a predetermined frequency ratio,
f
drv
,
II
f
1
=
f
drv
,
II
f
drv
,
I
=
Ω
,
to the instantaneous eigenfrequency, f 1 , of the mode of oscillation of first order, or to the instantaneous signal frequency of the signal component of the first type of the driver signal.
14 . The measuring system as claimed in claim 13 , wherein:
said transmitter electronics sets the signal frequency of the signal component of the second type of the driver signal in a predetermined frequency ratio,
f
drv
,
II
f
1
=
f
drv
,
II
f
drv
,
I
=
Ω
,
(especially a frequency ratio stored in a non-volatile data memory for measured values serving as reference values representing a reference state of the measuring system), to the instantaneous eigenfrequency, f 1 , of the mode of oscillation of the first order, or to the instantaneous signal frequency of the signal component of the first type of the driver signal.
15 . The measuring system as claimed in claim 1 , wherein:
said transmitter electronics, by means of the signal component (s sens1,II ) of the second type of the at least one oscillation signal (s sens1 ) as well as by means of the signal component (s drv,II ) of the second type of the driver signal (s drv ), ascertains, especially recurringly, a system parameter, measured value, for a system parameter, characterizing a measuring transducer transfer function inherent to said measuring transducer and, consequently, characterizing also the measuring system, according to which measuring transducer transfer function said measuring transducer converts the driver signal or an individual signal component (s drv,II ) thereof, especially an electrical current (i drv,II →s drv,II ) flowing in said at least one oscillation exciter and serving as signal component of the second type of the driver signal (s drv ) or a voltage (u drv,II→s drv,II ) driving such and serving as signal component (s drv,II ) of the second type of the driver signal, into the at least one oscillatory signal or individual signal components thereof, especially a voltage generated by means of said at least one oscillation sensor and serving as signal component of the second type of the oscillation signal.
16 . The measuring system as claimed in claim 15 , wherein:
said system parameter, corresponds to a ratio, u sens1,II /i drv,II , especially a complex ratio having a real—and an imaginary part, of a voltage (u sens1,II →s sens1,II ) generated by means of said at least one oscillation sensor and serving as a signal component of the second type of the oscillation signal (s sens1 ), to an electrical current (i drv,II →s drv,II ) flowing in said at least one oscillation exciter and serving as a signal component of the second type of the driver signal (s drv ).
17 . The measuring system as claimed in claim 15 , wherein: said system parameter, measured value, G ME,ti , for said system parameter, g ME , represents a ratio,
u
sens
1
,
II
i
drv
,
II
|
t
i
→
g
ME
,
ti
,
especially a complex ratio having a real—and an imaginary part, of a voltage (u sens1,II →s sens1,II ) generated by means of said at least one oscillation sensor and serving as a signal component of the second type of the oscillation signal (s sens1 ), to an electrical current (i drv,II →s drv,II ) flowing in said at least one oscillation exciter and serving as a signal component (s drv,II ) of the second type of the driver signal (s drv ).
18 . The measuring system as claimed in claim 15 , wherein:
said system parameter, G ME , corresponds to a ratio, u sens1,II /u drv,II , especially a complex ratio having a real—and an imaginary part, of a voltage (u sens1,II →s sens1,II ) generated by means of said at least one oscillation sensor and serving as a signal component of the second type of the oscillation signal (s sens1 ), to a voltage (u drv,II →s drv,II ) driving an electrical current flowing in said at least one oscillation exciter and serving as a signal component of the second type of the driver signal (s drv ).
19 . The measuring system as claimed in claim 15 , wherein:
said system parameter, measured value, G ME,ti , for said system parameter, g ME , represents a ratio,
u
sens
1
,
II
u
drv
,
II
|
t
i
→
g
ME
,
ti
,
especially a complex ratio having a real—and an imaginary part, of a voltage (u sens1,II →s sens1,II ) generated by means of said at least one oscillation sensor and serving as a signal component of the second type of the oscillation signal (s sens1 ), to a voltage (u drv,II →s drv,II ) driving an electrical current flowing in said at least one oscillation exciter and serving as a signal component of the second type of the driver signal (s drv ), or is ascertained by said transmitter electronics based on said amplitude ratio.
20 . The measuring system as claimed in claim 15 , wherein:
said system parameter, measured value, G ME,ti , for said system parameter, g ME , represents a phase difference, Δ φII =G ME,ti →g ME , between a voltage (u sens1,II →s sens1,II ) generated by means of said at least one oscillation sensor and serving as a signal component of the second type of the oscillation signal (s sens1 ), and an electrical current (i drv,II →s drv,II ) flowing in said at least one oscillation exciter and serving as a signal component of the second type of the driver signal (s drv ).
21 . The measuring system as claimed in claim 15 , wherein:
said system parameter, measured value, G ME,ti , for said system parameter, g ME , represents a phase difference, Δ φII | t i =G ME,ti →g ME , between a voltage (u sens1,II →s sens1,II ) generated by means of said at least one oscillation sensor and serving as a signal component of the second type of the oscillation signal (s sens1 ), and a voltage (u drv,II →s drv,II ) driving the electrical current flowing in said at least one oscillation exciter and serving as a signal component of the second type of the driver signal (s drv ).
22 . The measuring system as claimed in claim 15 , wherein:
said transmitter electronics ascertains the system parameter, measured value, G ME,ti , for said system parameter, g ME , based on a ratio,
Ω
t
i
=
f
drv
,
II
f
drv
,
I
|
t
i
=
f
drv
,
II
f
1
|
t
i
,
of the signal frequency (f drv,II ) of the signal component of the second type of the driver signal, to the signal frequency (f drv,I ) of the signal component of the first type of the driver signal.
23 . The measuring system as claimed in claim 15 , wherein:
said system parameter, measured value, G mE,ti , for said system parameter, g ME , represents a ratio,
U
sens
1
,
II
U
drv
,
II
|
t
i
=
G
ME
,
ti
→
g
ME
,
of an amplitude (U sens1,II ) of a voltage (u sens1,II →s sens1,II ) generated by means of said at least one oscillation sensor and serving as signal component of second type of the oscillation signal (s sens1 ), to an amplitude (U drv,II ) of a voltage (u drvII →s drv,II ) driving the electrical current flowing in said at least one oscillation exciter and serving as a signal component of the second type of the driver signal (s drv ), or is ascertained by said transmitter electronics based on said ratio.
24 . The measuring system as claimed in claim 15 , wherein:
said system parameter, measured value, G ME,ti , for said system parameter, g ME , represents a ratio,
U
sens
1
,
II
U
drv
,
II
·
Z
drv
,
II
|
t
i
=
G
ME
,
ti
→
g
ME
,
of an amplitude (U sens1,II ) of a voltage (u sens1,II →sens 1,II ) generated by means of said at least one oscillation sensor and serving as a signal component of the second type of the oscillation signal (s sens1 ), to an amplitude (U drv,II ) of a voltage (u drv,II →s drv,II ) driving the electrical current flowing in said at least one oscillation exciter and serving as a signal component of the second type of the driver signal (s drv ), multiplied by a parameter measured value representing an electrical impedance, Z drv,II , effective for the signal component of the second type of the driver signal of said at least one oscillation exciter, or is ascertained by said transmitter electronics based on said ratio.
25 . The measuring system as claimed in claim 24 , wherein:
said system parameter, measured value, G ME,ti , for said system parameter, g ME , represents a functional value of the functional equation:
(
1
-
f
drv
,
II
2
f
drv
,
I
2
)
f
drv
,
II
·
U
sens
1
,
II
U
drv
,
II
·
Z
drv
,
II
t
i
=
(
1
-
Ω
2
)
f
drv
,
I
·
Ω
·
U
sens
1
,
II
U
drv
,
II
·
Z
drv
,
II
t
i
=
G
ME
,
ti
→
g
ME
,
or is ascertained based on said functional equation.
26 . The measuring system as claimed in claim 15 , wherein:
said system parameter, measured value, G ME,ti , for said system parameter, g ME , represents a ratio,
U
sens
1
,
II
I
drv
,
II
t
i
=
G
ME
,
ti
→
g
ME
,
of an amplitude (U sens1,II ) of a voltage (u sens1,II →s sens1,II ) generated by means of said at least one oscillation sensor and serving as a signal component of the second type of the oscillation signal (s sens1 ), to an amplitude (I drv,II ) of an electrical current (i drv,II →s drv,II ) flowing in said at least one oscillation exciter and serving as a signal component (s drv,II ) of the second type of the driver signal (s drv ), or is ascertained by said transmitter electronics based on said ratio.
27 . The measuring system as claimed in claim 26 , wherein:
said system parameter, measured value, G ME,ti , for said system parameter, g ME , represents a functional value of the functional equation:
(
1
-
f
drv
,
II
2
f
drv
,
I
2
)
f
drv
,
II
·
U
sens
1
,
II
I
drv
,
II
t
i
=
(
1
-
Ω
2
)
f
drv
,
I
·
Ω
·
U
sens
1
,
II
I
drv
,
II
·
t
i
=
G
ME
,
ti
→
g
ME
,
or is ascertained by said transmitter electronics based on said functional equation.
28 . The measuring system as claimed in claim 15 , wherein:
said transmitter electronics ascertains the system parameter, measured value, G ME,ti , for said system parameter, g ME , based on a ratio,
Ω
t
i
=
f
drv
,
II
f
drv
,
I
t
i
=
f
drv
,
II
f
1
t
i
,
of the signal frequency (f drv,II ) of the signal component of the second type of the driver signal to the signal frequency (f drv,I ) of the signal component of the first type of the driver signal, as well as based on a ratio,
U
sens
1
,
II
U
drv
,
II
t
i
=
G
ME
,
ti
→
g
ME
,
of an amplitude (U sens1,II ) of a voltage (u sens1,II →s sens1,II ) generated by means of said at least one oscillation sensor and serving as a signal component of the second type of the oscillation signal (s sens1 ), to an amplitude (U drv,II ) of a voltage (u drv,II → drv,II ) driving the electrical current flowing in said at least one oscillation exciter and serving as a signal component of the second type of the driver signal (s drv ), especially based on the functional equation:
(
1
-
f
drv
,
II
2
f
drv
,
I
2
)
f
drv
,
II
·
U
sens
1
,
II
U
drv
,
II
·
Z
drv
,
II
t
i
=
(
1
-
Ω
2
)
f
drv
,
I
·
Ω
·
U
sens
1
,
II
U
drv
,
II
·
Z
drv
,
II
t
i
=
G
ME
,
ti
→
g
ME
.
29 . The measuring system as claimed in claim 15 , wherein:
said transmitter electronics ascertains the system parameter, measured value, G ME,ti , for said system parameter, g ME , based on a ratio,
Ω
t
i
=
f
drv
,
II
f
drv
,
I
t
i
=
f
drv
,
II
f
1
t
i
,
of the signal frequency (f drv,II ) of the signal component of second type of the driver signal to the signal frequency (f drv,I ) of the signal component of the first type of the driver signal as well as based on a ratio,
U
sens
1
,
II
I
drv
,
II
t
i
=
G
ME
,
ti
→
g
ME
,
of an amplitude (U sens1,II ) of a voltage (u sens1,II →s sens1,II ) generated by means of said at least one oscillation sensor and serving as a signal component of the second type of the oscillation signal (s sens1 ), to an amplitude (I drv,II ) of an electrical current (i drv,II →s drv,II ) flowing in said at least one oscillation exciter and serving as a signal component (s drv,II ) of the second type of the driver signal (s drv ), especially based on the functional equation:
(
1
-
f
drv
,
II
2
f
drv
,
I
2
)
f
drv
,
II
·
U
sens
1
,
II
I
drv
,
II
t
i
=
(
1
-
Ω
2
)
f
drv
,
I
·
Ω
·
U
sens
1
,
II
U
drv
,
II
t
i
=
G
ME
,
ti
→
g
ME
.
30 . The measuring system as claimed in claim 15 , wherein:
said transmitter electronics, by means of said system parameter, characterizing said measuring transducer transfer function, detects, whether, and/or to what extent, the measuring system, in comparison to a reference state ascertained earlier therefor, especially in a calibrating and/or at a start-up of the measuring system, is changed, especially as a result of aging and/or as a result of loading of said measuring transducer, especially in such a manner that said transmitter electronics, by means of said system parameter, characterizing said measuring transducer transfer function, in given cases, generates a system status report, especially a system status report in the form of an alarm, which signals, especially visually and/or acoustically perceivably, a deviation of the measuring system exceeding, by a predetermined measure of tolerance, a reference state ascertained earlier therefor.
31 . The measuring system as claimed in claim 1 , wherein:
said transmitter electronics, by means of the signal component of the first type of said at least one oscillation signal, and/or by means of the signal component of the first type of the driver signal, ascertains, especially recurringly, a media parameter, measured value, representing a parameter to be measured for flowing medium, especially mass flow rate, density and/or viscosity.
32 . The measuring system as claimed in claim 31 , wherein:
said transmitter electronics ascertains said at least one media parameter, measured value with application also of the system parameter, measured value, especially in such a manner that said transmitter electronics compensates an influence of a deviation (ascertained with application of the system parameter, measured value) of the measuring system from a reference state earlier ascertained therefor on an accuracy of measurement of the measuring system, with which media parameter, measured values, are ascertained.
33 . The measuring system as claimed in claim 1 , wherein:
said transmitter electronics has a data memory, especially a volatile, data memory, for measured values produced by means of the measuring system, in which data memory is held at least one measured data set formed by means of measured values produced during operation of the measuring system and representing, especially temporarily, an operating state of the measuring system, wherein the data set comprises system parameter, measured values for different system parameters characterizing the measuring system and is produced based on the signal component of the second type of the driver signal and/or based on the signal component of the second type of said at least one sensor signal.
34 . The measuring system as claimed in claim 33 , wherein:
the measured data set comprises a system parameter, measured value for the signal component of the second type of said driver signal supplied to said at least one oscillation exciter during operation of the measuring system and/or a system parameter, measured value for the signal component of the second type of the at least one oscillation signal delivered by said measuring transducer during operation of the measuring system and/or a system parameter, measured value derived from the signal component of the second type of the driver signal supplied to said exciter mechanism during operation of the measuring system and derived from the signal component of the second type of said at least one oscillation signal delivered from said measuring transducer during operation of the measuring system.
35 . The measuring system as claimed in claim 33 , wherein:
in said data memory for measured values produced by means of the measuring system, a measured data set formed by means of measured values produced during operation of the measuring system and representing medium conveyed in said measuring transducer is held; and the data set comprises media parameter, measured values, for different parameters characterizing the flowing medium, especially mass flow rate, density and/or viscosity, and is produced based on the signal component of the first type of the driver signal and/or based on the signal component of the first type of said at least one sensor signal.
36 . The measuring system as claimed in claim 1 , wherein;
said transmitter electronics has a data memory, especially a non-volatile, data memory, for measured values serving as reference values representing a reference state of the measuring system, in which data memory is held at least one reference data set representing a reference state of the measuring system, especially a measuring system already installed in a pipeline; and the data set includes system parameter, reference values for different system parameters, namely system parameters characterizing the measuring system, especially system parameter, reference values produced in the course of a calibrating of the measuring system in the plant of the manufacturer and/or during a start-up of the measuring system by means of the same, especially in such a manner that said system parameter, reference values are measured values produced by means of the measuring system itself located in the reference state and/or by means of the measuring transducer conveying medium of known temperature.
37 . The measuring system as claimed in claim 36 , wherein:
the reference data set comprises a system parameter, reference value for a signal component of the second type of the driver signal supplied to said at least one oscillation exciter when the measuring system is in the reference state and/or a system parameter, reference value for a signal component of the second type of the at least one oscillation signal delivered by said measuring transducer when the measuring system is in the reference state and/or a system parameter, reference value derived from a signal component of the second type of the driver signal sup'plied to said exciter mechanism when the measuring system is in the reference state and derived from a signal component of the second type of the at least one oscillatory signal delivered by the measuring transducer when the measuring system is in the reference state.
38 . The measuring system as claimed in claim 36 , wherein:
said reference data set comprises a system parameter, reference value, for the system parameter, characterizing said measuring transducer transfer function of the measuring system located in the reference state, especially a system parameter, reference value ascertained by means of said measuring system itself located in the reference state and/or by means of the measuring transducer conveying medium of a known temperature.
39 . The measuring system as claimed in claim 38 , wherein:
said system parameter, reference value, G ME,Ref , for said system parameter, g ME , represents a ratio,
u
sens
1
,
II
i
drv
,
II
t
Ref
→
g
ME
,
Ref
,
of a voltage (u sens1II →s sens1,II ) generated by means of said at least one oscillation sensor when the measuring system is in the reference state and serving as a signal component of the second type of the oscillation signal (s sens1 ), to a voltage (u drv,II →s drv,II ) driving an electrical current flowing in said at least one oscillation exciter when the measuring system is in the reference state and serving as signal component of a second type of the driver signal (s drv ).
40 . The measuring system as claimed in claim 38 , wherein:
said system parameter, measured value, G ME,Ref , for said system parameter, g ME , represents a ratio,
u
sens
1
,
II
u
drv
,
II
t
Ref
→
g
ME
,
Ref
,
of a voltage (u sens1,II →s sens1,II ) generated by means of said at least one oscillation sensor when the measuring system is in the reference state and serving as a signal component (s sens1,II ) of the second type of the oscillation signal (s sens1 ), to a voltage (u drv,II →s drv,II ) driving an electrical current flowing in said at least one oscillation exciter when the measuring system is in the reference state and serving as a signal component of the second type of the driver signal (s drv ).
41 . The measuring system as claimed in claim 38 , wherein:
said system parameter, measured value, G ME,ti , for said system parameter, g ME , represents a phase difference, Δ φII | t ref =G ME,Ref →g ME , between a voltage (u sens1,II →s sens1,II ) generated by means of said at least one oscillation sensor when the measuring system is in the reference state and serving as a signal component of the second type of the oscillation signal (s sens1 ), and a voltage (u drv,II →s drv,II ) driving the electrical current flowing in said at least one oscillation exciter when the measuring system is in the reference state and serving as a signal component of the second type of the driver signal (s drv ).
42 . The measuring system as claimed in claim 38 , wherein:
said system parameter, measured value, G ME,Ref , for said system parameter, g ME , represents a ratio,
U
sens
1
,
II
U
drv
,
II
t
Ref
=
G
ME
,
Ref
→
g
ME
,
of an amplitude (U sens1,II ) of a voltage (u sens1,II →s sens1,II ) generated by means of said at least one oscillation sensor when the measuring system is in the reference state and serving as a signal component of the second type of the oscillation signal (s sens1 ), to an amplitude (u drv,II ) of a voltage (u drv,II →s drv,II ) driving an electrical current flowing in said at least one oscillation exciter when the measuring system is in the reference state and serving as signal component of the second type of the driver signal (s drv ).
43 . The measuring system as claimed in claim 36 , wherein:
said transmitter electronics, based on the reference data set and the measured data set, especially based on a deviation, ΔG ME , ascertained between the reference data set and the measured data set, detects, whether, and/or to what extent, the measuring system has changed in comparison to the reference state ascertained earlier therefor.
44 . The measuring system as claimed in claim 43 , wherein:
said transmitter electronics, based on a deviation, ΔG ME , ascertained between the reference data set and the measured data set, detects, whether, and/or to what extent, the measuring system has changed in comparison to the reference state ascertained earlier therefor, especially in such a manner that said transmitter electronics compares, especially recurringly, the reference data set with the measured data set.
45 . The measuring system as claimed in claim 44 , wherein:
said transmitter electronics compares, especially recurringly, the reference data set with the measured data set by determining a deviation, ΔG ME , of at least one of the system parameter, measured values forming the measured data set from a corresponding system parameter, reference value, namely that representing the same system parameter, especially in such a manner that said transmitter electronics ascertains a difference, (G ME,ti −G ME,Ref )→ΔG ME , between said system parameter, measured value and the corresponding system parameter, reference value, and/or that said transmitter electronics ascertains a ratio,
G
ME
,
ti
G
ME
,
Ref
-
1
→
Δ
G
ME
of said system parameter, measured value to the corresponding system parameter, reference value.
46 . The measuring system as claimed in claim 43 , wherein:
said transmitter electronics compares the reference data set with the measured data set by ascertaining a deviation, ΔG ME , between a system parameter, reference value, G ME,Ref , which represents a functional value of the functional equation:
(
1
-
f
drv
,
II
2
f
drv
,
I
2
)
f
drv
,
II
·
U
sens
1
,
II
U
drv
,
II
·
Z
drv
,
II
t
Ref
=
(
1
-
Ω
2
)
f
drv
,
I
·
Ω
·
U
sens
1
,
II
U
drv
,
II
·
Z
drv
,
II
t
Ref
=
G
ME
,
Ref
→
g
ME
,
or is ascertained based on said functional equation, and a system parameter, measured value, G ME,ti , which represents a functional value of the functional equation:
(
1
-
f
drv
,
II
2
f
drv
,
I
2
)
f
drv
,
II
·
U
sens
1
,
II
U
drv
,
II
·
Z
drv
,
II
t
i
=
(
1
-
Ω
2
)
f
drv
,
I
·
Ω
·
U
sens
1
,
II
U
drv
,
II
·
Z
drv
,
II
t
i
=
G
ME
,
ti
→
g
ME
,
or is ascertained based on said functional equation, especially in such a manner that the ascertained deviation, ΔG ME , fulfills the functional equation:
(
1
-
f
drv
,
II
2
f
drv
,
I
2
)
f
drv
,
II
·
Z
drv
,
II
t
i
-
(
1
-
f
drv
,
II
2
f
drv
,
I
2
)
f
drv
,
II
·
U
sens
1
,
II
U
drv
,
II
·
Z
drv
,
II
t
Ref
=
Δ
G
ME
,
or that the ascertained deviation, ΔG ME , fulfills the functional equation:
(
1
-
f
drv
,
II
2
f
drv
,
I
2
)
f
drv
,
II
·
U
sens
1
,
II
U
drv
,
II
·
Z
drv
,
II
t
i
(
1
-
f
drv
,
II
2
f
drv
,
I
2
)
f
drv
,
II
·
U
sens
1
,
II
U
drv
,
II
·
Z
drv
,
II
t
Ref
-
1
=
Δ
G
ME
.
47 . The measuring system as claimed in claim 43 , wherein:
said transmitter electronics compares the reference data set with the measured data set by ascertaining a deviation, ΔG ME , between a system parameter, reference value, G mE,Ref , which represents a functional value of the functional equation:
1
f
drv
,
II
·
U
sens
1
,
II
U
drv
,
II
·
Z
drv
,
II
t
Ref
=
G
ME
,
Ref
→
g
ME
,
or is ascertained based on said functional equation, and a system parameter, measured value, G ME,ti , which represents a functional value of the functional equation:
1
f
drv
,
II
·
U
sens
1
,
II
U
drv
,
II
·
Z
drv
,
II
t
i
=
G
ME
,
ti
→
g
ME
,
or is ascertained based on said functional equation, especially in such a manner that the ascertained deviation, ΔG ME , fulfills the functional equation:
1
f
drv
,
II
·
Z
drv
,
II
t
i
-
1
f
drv
,
II
·
U
sens
1
,
II
U
drv
,
II
·
Z
drv
,
II
t
Ref
=
Δ
G
ME
,
or that the ascertained deviation, ΔG ME , fulfills the functional equation:
1
f
drv
,
II
·
U
sens
1
,
II
U
drv
,
II
·
Z
drv
,
II
t
i
1
f
drv
,
II
·
U
sens
1
,
II
U
drv
,
II
·
Z
drv
,
II
t
Ref
-
1
=
Δ
G
ME
.
48 . The measuring system as claimed in claim 43 , wherein:
said transmitter electronics compares the reference data set with the measured data set by ascertaining a deviation, ΔG ME , between a system parameter, reference value, G ME,Ref , which represents a functional value of the functional equation:
(
1
-
f
drv
,
II
2
f
drv
,
I
2
)
f
drv
,
II
·
U
sens
1
,
II
I
drv
,
II
t
Ref
t
=
(
1
-
Ω
2
)
f
drv
,
I
·
Ω
·
U
sens
1
,
II
U
drv
,
II
t
Ref
=
G
ME
,
Ref
→
g
ME
,
or is ascertained based on said functional equation, and a system parameter, measured value, G ME,ti , which represents a functional value of the functional equation:
(
1
-
f
drv
,
II
2
f
drv
,
I
2
)
f
drv
,
II
·
(
U
sens
1
,
II
I
drv
,
II
)
t
i
=
(
1
-
Ω
2
)
f
drv
,
I
·
Ω
·
U
sens
1
,
II
I
drv
,
II
t
i
=
G
ME
,
ti
→
g
ME
,
or is ascertained based on said functional equation, especially in such a manner that the ascertained deviation, ΔG ME , fulfills the functional equation:
(
1
-
f
drv
,
II
2
f
drv
,
I
2
)
f
drv
,
II
·
U
sens
1
,
II
U
drv
,
II
t
i
-
(
1
-
f
drv
,
II
2
f
drv
,
I
2
)
f
drv
,
II
·
U
sens
1
,
II
U
drv
,
II
t
Ref
=
Δ
G
ME
,
or that the ascertained deviation, ΔG ME , fulfills the functional equation:
(
1
-
f
drv
,
II
2
f
drv
,
I
2
)
f
drv
,
II
·
U
sens
1
,
II
U
drv
,
II
t
i
(
1
-
f
drv
,
II
2
f
drv
,
I
2
)
f
drv
,
II
·
U
sens
1
,
II
I
drv
,
II
t
Ref
-
1
=
Δ
G
ME
.
49 . The measuring system as claimed in claim 43 , wherein:
said transmitter electronics compares the reference data set with the measured data set by ascertaining a deviation, ΔG ME , between a system parameter, reference value, G ME,Ref , which represents a functional value of the functional equation:
1
f
drv
,
II
·
U
sens
1
,
II
I
drv
,
II
t
Ref
=
G
ME
,
Ref
→
g
ME
,
or is ascertained based on said functional equation, and a system parameter, measured value, G ME,ti , which represents a functional value of the functional equation:
1
f
drv
,
II
·
U
sens
1
,
II
I
drv
,
II
t
i
=
G
ME
,
ti
→
g
ME
,
or is ascertained based on said functional equation, especially in such a manner that the ascertained deviation, ΔG ME , fulfills the functional equation:
1
f
drv
,
II
·
U
sens
1
,
II
I
drv
,
II
t
i
-
1
f
drv
,
II
·
U
sens
1
,
II
I
drv
,
II
t
Ref
=
Δ
G
ME
,
or that the ascertained deviation, ΔG ME , fulfills the functional equation:
1
f
drv
,
II
·
U
sens
1
,
II
I
drv
,
II
t
i
1
f
drv
,
II
·
U
sens
1
,
II
I
drv
,
II
t
Ref
-
1
=
Δ
G
ME
.
50 . The measuring system as claimed in claim 36 , wherein;
said reference data set comprises a system parameter, reference value representing the eigenfrequency, f 1 , of the mode of oscillation of the first order when the measuring system is in the reference state, as well as a system parameter, reference value representing the signal frequency (f drv,II ) of the signal component of the second type of the driver signal supplied to said at least one oscillation exciter when the measuring system is in the reference state; and/or
said reference data set comprises a system parameter, reference value representing a ratio,
f
drv
,
II
f
1
t
Ref
=
f
drv
,
II
f
drv
,
1
t
Ref
=
f
drv
,
II
t
Ref
f
drv
,
1
t
Ref
=
Ω
,
of the signal frequency (f drv,II ) of the signal component of the second type of the driver signal supplied to said at least one oscillation exciter when the measuring system is in the reference state, to the eigenfrequency, f 1 , of the mode of oscillation of the first order when the measuring system is in the reference state.
51 . The measuring system as claimed in claim 43 , wherein:
said transmitter electronics, based on a comparison of reference- and measured data sets, generates a system status report, especially a system status report in the form of an alarm, which signals, especially visually and/or acoustically perceivably, a deviation (especially a deviation related to aging of the measuring system and/or related to loadings of said measuring transducer irreversibly changing an oscillatory behavior of said at least one measuring tube) of the measuring system from a reference state ascertained therefor earlier, especially in a calibrating and/or at a start-up of the measuring system.
52 . The measuring system as claimed in claim 44 , wherein:
said transmitter electronics, based on the ascertained deviation, ΔG ME , between the at least one system parameter, measured value and the corresponding system parameter, reference value, generates a system status report, especially a system status report in the form of an alarm, which signals, especially visually and/or acoustically perceivably, a deviation of the measuring system from the reference state earlier ascertained therefor exceeding a predetermined measure of tolerance, especially a deviation related to aging of the measuring system and/or related to loadings of the measuring transducer irreversibly changing an oscillatory behavior of said at least one measuring tube and/or related to thermal loadings of said measuring transducer changing an electrical impedance and/or an electro-mechanical transducer constant of said at least one oscillation exciter and/or related to thermal loadings of said measuring transducer changing an electrical impedance and/or an electro-mechanical transducer constant of said at least one oscillation sensor.
53 . The measuring system as claimed in claim 52 , wherein:
said transmitter electronics generates said system status report when the ascertained deviation, ΔG ME , exceeds a threshold value representing a measure of tolerance predetermined therefor, especially in such a manner that the ascertained deviation, ΔG ME , amounts to more than 0.1% of the associated system parameter, reference value.
54 . The measuring system as claimed in claim 1 , wherein:
the driver signal simultaneously contains the signal component of the first type and the signal component of the second type, whereby said at least one measuring tube, excited by said at least one oscillation exciter, simultaneously executes partially resonance oscillations, namely with an oscillation frequency, f drv,I =f 1 , corresponding to the instantaneous eigenfrequency, f 1 , of the mode of oscillation of first order, and partially forced oscillations outside of resonance.
55 . The measuring system as claimed in claim 1 , wherein:
the signal frequency, f drv,II , of the signal component (s drv,II ) of the second type of the driver signal (s drv ) is greater than 5 Hz, especially greater than 10 Hz, and/or wherein the signal frequency, f drv,II , of the signal component (s drv,II ) of the second type of the driver signal is greater than 0.1 times the instantaneous eigenfrequency of the mode of oscillation of the first order.
56 . The measuring system as claimed in claim 1 , wherein:
the signal frequency (f drv,II ) of the signal component of the second type (s drv,II ) of the driver signal (s drv ) corresponds to more than 1.01 times, especially more than 1.15 times, and less than 2.7 times, especially less than 2A times, an instantaneous eigenfrequency, f 1 , of the mode of oscillation of first order, whereby: said at least one measuring tube, excited by said at least one oscillation exciter, executes, at least partially, forced oscillations outside of resonance with an oscillation frequency lying in a frequency range, |1.01·f 1 <f drv,II <2.7·f 1 |, above 1.01 times, especially above 1.15 times, and below 2.7 times, especially below 2.4 times, the instantaneous eigenfrequency, f 1 , of the mode of oscillation of first order; and the signal frequency of the second signal component (s sens1,II ) of the oscillation signal (s sens1 ) lies above 1.01 times, especially above 1.15 times, and below 2.7 times, especially below 2.4 times, the instantaneous eigenfrequency, f 1 , of the mode of oscillation of first order.
57 . The measuring system as claimed in claim 56 , wherein:
said transmitter electronics step-wise changes the signal frequency of the signal component of the second type of the driver signal within the frequency range, |1.01·f 1 <f drv,II <2.7·f 1 |, above 1.01 times, especially above 1.15 times, and below 2.7 times, especially below 2.4 times, the instantaneous eigenfrequency, f 1 , of the mode of oscillation of first order, especially in such a manner that said transmitter electronics step-wise increases by a predeterminable magnitude, or step-wise lessens by a predeterminable magnitude, said signal frequency, beginning at a starting value predetermined therefor within said frequency range, |1.01·f 1 <f drv,II <2.7·f 1 |, and proceeding to an end value predetermined for the signal frequency within said frequency range; and/or said transmitter electronics continuously changes the signal frequency of the signal component of the second type of the driver signal within the frequency range, |1.01·f 1 <f drv,II <2.7·f 1 |, above 1.01 times, especially above 1.15 times, and below 2.7 times, especially below 2.4 times, the instantaneous eigenfrequency, f 1 , of the mode of oscillation of the first order, especially in such a manner that the transmitter electronics linearly increases, or linearly lessens, said signal frequency, beginning at a starting value predetermined therefor within said frequency range, and proceeding to an end value predetermined for the signal frequency within said frequency range, or that said transmitter electronics alternately linearly increases or linearly lessens said signal frequency.
58 . The measuring system as claimed in claim 1 , wherein:
the signal frequency (f drv,II ) of the signal component of the second type (s drv,II ) of the driver signal is smaller than an instantaneous eigenfrequency, f 2 , of a mode of oscillation of the second order of the at least one measuring tube, in which said at least one vibrating measuring tube can execute, or executes, about a resting position, oscillations which have in the region of the first and second measuring tube ends, in each case, an oscillation node and, in the region of the wanted, oscillatory length, an additional oscillation node as well as exactly two oscillatory antinodes, whereby: said at least one measuring tube, excited by said at least one oscillation exciter, executes, at least partially, forced oscillations outside of resonance, namely in a frequency range, |f drv,II <f 2 |, which lies below the instantaneous eigenfrequency of the mode of oscillation of second order, and the at least one oscillatory signal has, at least at times, a signal component of the second type with a signal frequency, which lies below the instantaneous eigenfrequency of the mode of oscillation of second order, especially in such a manner, that, said at least one measuring tube, excited by said at least one oscillation exciter, executes, at least partially, forced oscillations outside of resonance, namely in a frequency range, |f f <f drv,II <f 2 |, which lies above the instantaneous eigenfrequency, f 1 , of the mode of oscillation of the first order and below the instantaneous eigenfrequency, f 2 , of the mode of oscillation of the second order; and the at least one oscillatory signal has, at least at times, a signal component of the second type with a signal frequency, which lies above the instantaneous eigenfrequency of the mode of oscillation of the first order and below the instantaneous eigenfrequency of the mode of oscillation of the second order.
59 . The measuring system as claimed in claim 1 , wherein:
the signal frequency, f drv,II , of the signal component (s drv,II ) of the second type of the driver signal is smaller than 0.95 times the instantaneous eigenfrequency of the mode of oscillation of the second order.
60 . The measuring system as claimed in claim 1 , wherein:
the signal frequency of the signal component of the first type of the driver signal (s drv ) corresponds to an instantaneous eigenfrequency of a natural bending oscillation mode, in which said at least one vibrating measuring tube executes about its resting position bending oscillations, which have, in the region of said first and second measuring tube ends, in each case, an oscillation node and in the region of the wanted, oscillatory length exactly one oscillatory antinode (bending oscillation, fundamental mode), whereby: said at least one measuring tube, excited by said at least one oscillation exciter, executes, at least partially, especially predominantly, bending oscillations in resonance, namely bending oscillations with an oscillation frequency corresponding to the instantaneous eigenfrequency of said bending oscillation mode; and the signal frequency of the signal component of the first type of the at least one oscillation signal corresponds to the instantaneous eigenfrequency of said bending oscillation mode.
61 . The measuring system as claimed in claim 1 , wherein:
said at least one measuring tube is straight.
62 . The measuring system as claimed in claim 1 , wherein:
said at least one measuring tube is straight; and the signal frequency of the signal component of the first type of the driver signal (s drv ) corresponds to an instantaneous eigenfrequency of a natural torsional oscillation mode, in which said at least one vibrating measuring tube executes torsional oscillations about its resting position, namely, about an imaginary oscillation axis imaginarily connecting said inlet-side, first measuring tube end and said outlet-side, second measuring tube end, which torsional oscillations have in the region of said first and second measuring tube ends, in each case, an oscillation node and in the region of the wanted, oscillatory length exactly one oscillatory antinode (torsional oscillation, fundamental mode), whereby: said at least one measuring tube, excited by said at least one oscillation exciter, executes, at least partially, especially predominantly, torsional oscillations in resonance, namely with an oscillation frequency corresponding to the instantaneous eigenfrequency of said torsional oscillation mode; and the signal frequency of the signal component of the first type of the at least one oscillation signal corresponds to the instantaneous eigenfrequency of said torsional oscillation mode.
63 . The measuring system as claimed in claim 1 , wherein:
said measuring transducer has, for conveying flowing medium, at least two measuring tubes mechanically coupled with one another, especially two equally constructed measuring tubes and/or two measuring tubes extending at least sectionally parallel relative to one another; of which each extends with a wanted, oscillatory length between a respective inlet-side, first measuring tube end and a respective outlet-side, second measuring tube end; and of which each has, in each case, a natural mode of oscillation of the first order, in which it can execute, or executes, eigenoscillations about a respective resting position; which eigenoscillations have in the region of said respective first and second measuring tube ends, in each case, an oscillation node and in the region of the wanted, oscillatory length exactly one oscillatory antinode; and which eigenoscillations have, in each case, an eigenfrequency, f 1 , which equals the eigenfrequency, f 1 , of the natural mode of oscillation of the first order of the, in each case, other measuring tube.
64 . The measuring system as claimed in claim 1 , whereby:
said at least one oscillation exciter, acting, especially differentially, between said at least two measuring tubes, serves for converting electrical, excitation power into vibrations of each of said at least two measuring tubes, especially in such a manner that each of said at least two measuring tubes executes simultaneously, at least partially, oscillations about a resting position with an instantaneous eigenfrequency of a natural mode of oscillation inherent to it; and the signal frequency, f drv,I , of the signal component (s drv,I ) of the first type of the driver signal (s drv ) corresponds to an instantaneous eigenfrequency, f 1 , of the natural mode of oscillation of the first order of each of said at least two measuring tubes, whereby each of said at least two measuring tubes, excited by said at least one oscillation exciter, executes, at least partially, especially predominantly, resonance oscillations, namely resonance oscillations with an oscillation frequency, f exc,I =f 1 , corresponding to the instantaneous eigenfrequency, f 1 , of the mode of oscillation of the first order, especially in such a manner that the oscillations of the at least two measuring tubes are opposite equal relative to one another.
65 . The measuring system as claimed in claim 1 , wherein:
said measuring transducer has, for conveying flowing medium, four measuring tubes mechanically coupled with one another, especially equally constructed measuring tubes and/or measuring tubes extending at least pairwise sectionally parallel relative to one another.Cited by (0)
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