CN101937043B - Flowmeter and method for detecting cable faults in cable line of flowmeter - Google Patents
Flowmeter and method for detecting cable faults in cable line of flowmeter Download PDFInfo
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- CN101937043B CN101937043B CN 201010261048 CN201010261048A CN101937043B CN 101937043 B CN101937043 B CN 101937043B CN 201010261048 CN201010261048 CN 201010261048 CN 201010261048 A CN201010261048 A CN 201010261048A CN 101937043 B CN101937043 B CN 101937043B
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Abstract
The embodiment of the invention provides a method for detecting cable faults in a cable line of a flowmeter, comprising the following steps: aiming at a detection electric wire open fault, testing one or more of first detection electric wires and one or more of second detection electric wires of cable line; if the condition that the detection electric wire open fault does not exist in the first detection electric wire and the second detection electric wire is confirmed, testing the first detection electric wire and the second detection electric wire by aiming at the detection connected directional fault; testing one or more of driver electric wires by aiming at the driver electric wire open fault; and testing the driver electric wire aiming at the driver connected directional fault if thecondition that the driver electric wire open fault does not exist in the driver electric wire is confirmed.
Description
Technical field
The present invention relates to a kind of flowmeter and detect the method for the cable fault in the cable line of this flowmeter.
Background technology
Vibrating conduit sensor (for example coriolis mass flowmeters) operates by the motion that detection comprises the vibrating conduit of stream material usually.Can be by processing the character that measuring-signal is determined and ducted material is relevant that receives from the movement transducers related with this pipeline, such as mass rate and density etc.The vibration mode of the vibrational system of filler generally is subject to combination quality, rigidity and the damping characteristic of the pipeline of contain material and the impact that is contained in this ducted material.
General coriolis mass flowmeters comprises one or more pipeline, and these pipelines are connected in series transportation of substances in pipeline or other transportation system and in system, such as fluid and mud etc.Every pipeline can be considered and has one group of eigentone, comprises for example simple bending, reverses, radially and coupled mode.In general Coriolis mass flow measurement application, when material is flowed through pipeline, encourage this pipeline with one or more vibration modes, and along this pipeline enclosure every the some place measure moving of this pipeline.Usually provide excitation by the actuator of disturbance pipeline in a periodic manner, electromechanical assembly for example is such as the voice coil type driver.Can determine mass flowrate by time delay or the phase differential measured between the motion at transducer position place.Usually adopt two such transducers (or detecting sensor (pickoff sensor)) in order to measure the vibratory response of flow duct, and described transducer is usually located at the upstream and downstream position of actuator.These two detect sensor and are connected to electronic device by cable line (for example independently two pairs of electric wires).This instrument detects sensor from described two and receives signal and process these signals in order to draw the measurement of mass flow rate value.
When the flow duct of coriolis flowmeter emptied, then the phase differential between two detecting signals (pickoff signal) was desirably zero.On the contrary, during normal running, because Coriolis effect, the flow of process flowmeter causes the phase shift between these two detecting signals.This phase shift is directly proportional with mass flow-rate through piping.Therefore, by signal difference is carried out Measurement accuracy, flowmeter is the measurement quality flow rate exactly.
Coriolis flowmeter usually drives flow duct with coil and measures the flow duct vibration that causes thus.In a lot of situations, flow sensor equipment (that is, flow duct, detect sensor and driver) is not installed integratedly with the transmitter electronic equipment.General coriolis flowmeter comprises 9 electric wires in the cable that is banded between transmitter/meter electronics and the flow sensor equipment.Cable line generally includes 3 electric wires that are used for resistance temperature detector (RTD) sensor, 2 and is used for the first electric wire that detects sensor, 2 and is used for second electric wire and 2 electric wires that are used for driver that detect sensor.
Cable line is connected by the user usually at the scene.This may cause problem in cable line.Each may be exchanged electric wire.Electric wire may be mixed up.Bad terminal connects or the coil of inefficacy can cause open circuit.For example, if first detect sensor along the first directed connection, second detects sensor along the second opposite directed connection, and the phase shift that records in zeroing operating period so will be excessive.Similarly, when the electric wire that is connected to driver is exchanged, will can not observe the phase propetry of expection so, and the backfeed loop of driving circuit can drive response rather than drive response towards fundamental frequency towards zero point.
Another problem that may occur is the electric wire that disconnects or do not connect between parts.Before starting working, element may can't detect the electric wire that disconnects or do not connect.At user location tracing trouble and to deal with problems be that cost is high and time-consuming.In addition, the user can be subject to the impact of shut-down period, expense and setback.
It is desirable to, whether transmitter automatically determines sensor by correctly wiring, if not, then correct the problem that runs into.In addition, need to be independent of change in process and determine whether correct wiring.
Summary of the invention
Provide a kind of meter electronics for detection of the cable fault in the cable line of flowmeter according to embodiments of the invention.This meter electronics comprises that first and second detect sensor and this cable line and are connected to described first and second and detect sensor.This cable line comprises one or more the first and detects electric wire (pickoff wire) and one or more the second and detect electric wire.This meter electronics also comprises the signal injection device that is connected to cable line.This signal injection device construction becomes to produce Injection Signal and is sent to this Injection Signal in the cable line and sends first and second to detect sensor.This meter electronics also comprises the circuit for signal conditioning that is connected to cable line.This circuit for signal conditioning is configured to receive at least one response signal in response to Injection Signal from first and second at least one that detect sensor, and one or more the first the detecting electric wire and second detect one of electric wire or detecting electric wire open fault (pickoff open wire fault) and being connected among both connects in the directed fault (pickoff connection orientation fault) one or more with being connected of definite cable line.
Provide a kind of meter electronics for detection of the cable fault in the cable line of flowmeter according to embodiments of the invention.This meter electronics comprises that driver, first and second detects sensor, and described cable line is connected to described first and second and detects sensor and be connected to described driver.This meter electronics also comprises driving circuit, and this driving circuit is connected to cable line and is configured to produce to drive signal and should drives signal and is sent in the cable line and sends described driver to.This meter electronics also comprises the circuit for signal conditioning that is connected to cable line.This circuit for signal conditioning is configured to receive at least one response signal in response to driving signal from first and second at least one that detect sensor, and the driver electric wire open fault in the one or more driver electric wire of definite cable line is connected in the directed fault one or more with driver.
Provide a kind of method for detection of the cable fault in the cable line of flowmeter according to embodiments of the invention.The method comprises: will detect the Injection Signal component that sensor and second detects the response signal of at least one reception the sensor from first and detect amplitude threshold and compare with predetermined, should predetermined not detect amplitude threshold if this Injection Signal component surpasses, determine then that corresponding one or more the first detected electric wire or corresponding one or more the second and detect and detect the electric wire open fault in the electric wire.
Provide a kind of method for detection of the cable fault in the cable line of flowmeter according to embodiments of the invention.The method comprises: detect first of response signal with first and detect response phase and second and detect the phase differential that second of response signal detects between the response phase and detect phase difference threshold and compare with predetermined.Detecting sensor and second via cable line from first detects sensor and receives described first and detect response signal and described second and detect response signal.The method also comprises: detect phase difference threshold if described phase differential surpasses described being scheduled to, then determine to detect the directed fault of connection.
Provide a kind of method for detection of the cable fault in the cable line of flowmeter according to embodiments of the invention.The method comprises: the driving resistance R that will cross over the driving circuit output
DDriving resistive voltage and predetermined voltage threshold compare, surpassed this predetermined voltage threshold if should drive resistive voltage, then determine the driver electric wire open fault in the one or more driver electric wire.
Provide a kind of method for detection of the cable fault in the cable line of flowmeter according to embodiments of the invention.The method comprises: response signal phase differential and predetermined drive phase difference limen value are compared.This response signal phase differential comprises the difference between response signal phase place and the driving signal phase.Receive this response signal phase place from first at least one that detects that sensor and second detects the sensor.The method also comprises: if described response signal phase differential surpasses described predetermined drive phase difference limen value, determine that then the driver in the one or more driver electric wire connects directed fault.
Provide a kind of method for detection of the cable fault in the cable line of flowmeter according to embodiments of the invention.The method comprises: determine the vibratory response amplitude of vibratory response, if this vibratory response amplitude is not followed the tracks of drive signal amplitude basically, determine that then the driver in the one or more driver electric wire connects directed fault.
Provide a kind of method for detection of the cable fault in the cable line of flowmeter according to embodiments of the invention.The method comprises: one or more the first detect electric wire and one or more the second and detect electric wire for what detect electric wire open fault test cable circuit.Described one or more the first detect electric wire and described one or more the second detects electric wire and is included in the cable line and is connected respectively to first and detect sensor and second and detect sensor.The method also comprises: detect and determine not detect the electric wire open fault in the electric wire if detect electric wire and described one or more the second described one or more the first, then connect directed fault test described one or more the first and detect electric wire and described one or more the second and detect electric wire for detecting.The method also comprises: for one or more driver electric wire of driver electric wire open fault test cable circuit.Described one or more driver electric wire is connected to driver.The method also comprises: if determine not have driver electric wire open fault in described one or more driver electric wire, then connect the described one or more driver electric wire of directed fault test for driver.
One side at described meter electronics, described circuit for signal conditioning is configured to the Injection Signal component of at least one response signal and is scheduled to detect amplitude threshold compare, should predetermined not detect amplitude threshold if this Injection Signal component surpasses, determine then that corresponding one or more the first detected electric wire or corresponding one or more the second and detect and detect the electric wire open fault in the electric wire.
At described meter electronics on the other hand, described circuit for signal conditioning reception first detects response signal and second and detects response signal, and described circuit for signal conditioning is configured to detect the phase differential that response phase and second detects between the response phase with first and detects phase difference threshold and compare with predetermined, if described phase differential surpasses the described predetermined phase difference threshold that detects, determine that then corresponding one or more the first detect electric wire or corresponding one or more the second and detect detecting in the electric wire and connect directed fault.
Aspect described meter electronics another, described signal injection device comprises: digital-to-analogue (D/A) converter, this digital to analog converter are configured to receive numerical frequency instruction and output frequency input; Injection Signal generator, this Injection Signal generator are inputted the Injection Signal of defined frequency by this frequency from this D/A converter receive frequency input and output; And, transformer, this transformer is sent to this Injection Signal in the cable line.
Aspect described meter electronics another, connect directed fault if determine to exist to detect, then described circuit for signal conditioning also is configured to make from one and detects the response signal upset that sensor receives.
Aspect described meter electronics another, described circuit for signal conditioning is configured to cross over the driving resistance R of driving circuit output
DDriving resistive voltage and predetermined voltage threshold compare, surpassed this predetermined voltage threshold if should drive resistive voltage, then determine the driver electric wire open fault in the described one or more driver electric wire.
Aspect described meter electronics another, described circuit for signal conditioning is configured to response signal phase differential and predetermined drive phase difference limen value are compared, if surpassing, this response signal phase differential should be scheduled to drive phase difference limen value, determine that then the driver in the described one or more driver electric wire connects directed fault, this response signal phase differential comprises the response signal phase place and drives difference between the signal phase, receives this response signal phase place from described first at least one that detects that sensor and described second detects the sensor.
Aspect described meter electronics another, described meter electronics also is configured to determine the vibratory response amplitude of vibratory response, if this vibratory response amplitude is not followed the tracks of drive signal amplitude basically, determine that then the driver in the described one or more driver electric wire connects directed fault.
Aspect described meter electronics another, if determine to exist driver to connect directed fault, then described driving circuit also is configured to make and drives the signal upset.
In an embodiment of described method, described method also comprises: detect the electric wire open fault if determine to exist, then produce alarm.
In another embodiment of described method, described comparison and determine also to comprise: will detect amplitude threshold and compare with predetermined from the first the first Injection Signal component that detects the first response signal of sensor, should predetermined not detect amplitude threshold if this first Injection Signal component surpasses, determine then that described one or more the first detected first in the electric wire and detect the electric wire open fault; To detect amplitude threshold and compare with predetermined from the second the second Injection Signal component that detects the second response signal of sensor, should predetermined not detect amplitude threshold if this second Injection Signal component surpasses, determine then that described one or more the second detected second in the electric wire and detect the electric wire open fault.
In another embodiment of described method, described method also comprises: connect directed fault if determine to exist to detect, then produce alarm.
In another embodiment of described method, described method also comprises: described determine after, connect directed fault if determine to exist to detect, then make from one and detect the response signal upset that sensor receives.
In another embodiment of described method, described method also comprises: if determine to exist driver electric wire open fault, then produce alarm.
In another embodiment of described method, described method also comprises: if determine to exist driver to connect directed fault, then produce alarm.
In another embodiment of described method, described method also comprises: described determine after, if determine to exist driver to connect directed fault, then make the driving signal upset from driving circuit.
In another embodiment of described method, described method also comprises: if determine to exist driver to connect directed fault, then produce alarm.
In another embodiment of described method, described method also comprises: described determine after, if determine to exist driver to connect directed fault, then make the driving signal upset from driving circuit.
In another embodiment of described method, described method also comprises: if determine to detect in the electric wire described one or more the first, detect in the electric wire or in described one or more driver electric wire described one or more the second and have the electric wire open fault, then produce alarm.
In another embodiment of described method, described method also comprises: if determine to detect in the electric wire described one or more the first, detect in the electric wire or exist in described one or more driver electric wire described one or more the second and connect directed fault, then produce alarm.
In another embodiment of described method, describedly comprise for detecting the one or more sensors that detect of electric wire open fault test: will detect the Injection Signal component that sensor and second detects the response signal of at least one reception the sensor from first and detect amplitude threshold and compare with predetermined, should predetermined not detect amplitude threshold if this Injection Signal component surpasses, determine then that corresponding one or more the first detected electric wire or corresponding one or more the second and detect and detect the electric wire open fault in the electric wire.
In another embodiment of described method, describedly connect directed fault test described one or more the first and detect electric wire and described one or more the second and detect electric wire and comprise for detecting: detect first of response signal with first and detect response phase and second and detect the phase differential that second of response signal detects between the response phase and detect phase difference threshold and compare with predetermined, detecting sensor and second via cable line from first detects sensor and receives described first and detect response signal and described second and detect response signal, detect phase difference threshold if described phase differential surpasses described being scheduled to, then determine to detect the directed fault of connection.
In another embodiment of described method, described method also comprises: connect directed fault for after detecting the directed fault test of connection if determine to exist to detect described, then make the response signal upset that detects sensor from.
In another embodiment of described method, comprise for the described driver of electric wire open test: the driving resistance R that will cross over the driving circuit output
DDriving resistive voltage and predetermined voltage threshold compare, surpassed this predetermined voltage threshold if should drive resistive voltage, then determine the driver electric wire open fault in the described one or more driver electric wire.
In another embodiment of described method, describedly connect the described one or more driver electric wire of directed fault test for driver and comprise: response signal phase differential and predetermined drive phase difference limen value are compared, this response signal phase differential comprises the difference between response signal phase place and the driving signal phase, receive this response signal phase place from described first at least one that detects that sensor and described second detects the sensor, should be scheduled to drive phase difference limen value if this response signal phase differential surpasses, determine then that the driver in the described one or more driver electric wire connected directed fault.
In another embodiment of described method, describedly connect the described one or more driver electric wire of directed fault test for driver and comprise: the vibratory response amplitude of determining vibratory response, if this vibratory response amplitude is not followed the tracks of drive signal amplitude basically, determine that then the driver in the described one or more driver electric wire connects directed fault.
In another embodiment of described method, described method also comprises: described connect the described one or more driver electric wire of directed fault test for driver after, if determine to exist driver to connect directed fault, then make the driving signal upset from described driver.
Description of drawings
Fig. 1 illustrates the coriolis flowmeter that comprises flow meter assembly and meter electronics.
Fig. 2 is the diagram of the part of flowmeter according to an embodiment of the invention.
Fig. 3 is the process flow diagram of the method for detection of the cable fault in the cable line of flowmeter according to an embodiment of the invention.
Fig. 4 is the process flow diagram of the method for detection of the cable fault in the cable line of flowmeter according to an embodiment of the invention.
Fig. 5 is the process flow diagram of the method for detection of the cable fault in the cable line of flowmeter according to an embodiment of the invention.
Fig. 6 is the process flow diagram of the method for detection of the cable fault in the cable line of flowmeter according to an embodiment of the invention.
Fig. 7 is the process flow diagram of the method for detection of the cable fault in the cable line of flowmeter according to an embodiment of the invention.
Fig. 8 illustrates flowmeter according to an embodiment of the invention.
Embodiment
Fig. 1-8 and following declarative description instruction those skilled in the art how to realize and use the concrete example of best mode of the present invention.For the purpose of teaching inventive principle, some conventional aspects are simplified or omit.Those skilled in the art can expect modification from these examples that fall within the scope of the present invention.Those skilled in the art can expect that combination feature hereinafter described is to form multiple modification of the present invention in every way.Therefore, the invention is not restricted to concrete example hereinafter described, but only by claim and be equal to claim and limited.
Fig. 1 illustrates the coriolis flowmeter 5 that comprises flow meter assembly 10 and meter electronics 20.Meter electronics 20 is connected to instrument assembly 10 via wire 100, thereby provides density, mass flowrate, volume flow rate, total mass flow rate, temperature and other information at path 26.Should it is evident that those skilled in the art, the present invention can need not consider driver, detect the quantity of sensor, flow duct or the operator scheme of vibration for the coriolis flowmeter of any type.The additional measurement capability that need to do not provided by coriolis flowmeter although it will be apparent for a person skilled in the art that the present invention can be embodied as vibrating tube densimeter is still described the structure of coriolis flowmeter.
Flow meter assembly 10 comprises a pair of flange 101 and 101 ', manifold 102 and 102 ', driver 104, detects sensor 105-105 ' and flow duct 103A and 103B.Driver 104 and detect sensor 105 and 105 ' and be connected to flow duct 103A and 103B.
Choose flow duct 103A and 103B and described flow duct suitably is installed to inlet manifold 102 and outlet manifold 102 ', crank axle W-W has identical mass distribution, moment of inertia and module of elasticity basically with W '-W ' so that described flow duct is gone for a stroll respectively.Described flow duct stretches out from described manifold in substantially parallel mode.
Fig. 2 is the diagram of the part of flowmeter 5 according to an embodiment of the invention.Flowmeter 5 comprises that first detects sensor 201a, second and detect sensor 201b, driver 204 and meter electronics 20.Meter electronics 20 is operable as mass flowmeter or is operable as densitometer, comprises being operating as coriolis flowmeter.Except other parts, meter electronics 20 can comprise driving circuit 220, signal injection device 203 and circuit for signal conditioning 202.Meter electronics 20 is connected to by cable line 205 and detects sensor 201 and driver 204.Cable line 205 detects sensor 201a and second with first and detects sensor 201b and be connected to circuit for signal conditioning 202 and signal injection device 203.Cable line 205 is connected to driving circuit 220 with driver 204.In one embodiment, circuit for signal conditioning 202 and signal injection device 203 interconnect by circuit 210.
General flowmeter comprises 9 electric wires in the cable line 205 that is banded between transmitter/meter electronics 20 and the flow meter assembly 10.Cable line 205 generally includes 3 electric wires that are used for resistance temperature detector (RTD) sensor, 2 and is used for the first electric wire that detects sensor, 2 and is used for second electric wire and 2 electric wires that are used for driver that detect sensor.
In one embodiment, meter electronics 20 can and detect cable line 205 between sensor 201a, the 201b to this meter electronics 20 and carries out cable fault and determine.In one embodiment, it is definite that meter electronics 20 can carry out to the cable line 205 between this meter electronics 20 and the driver 204 cable fault.
Driving circuit 220 produces to drive signal and should drive signal and sends driver 204 to.Driver 204 makes flow duct 103A and 103B vibration according to this driving signal.Drive signal and therefore comprise amplitude characteristic and frequency characteristic.When meter electronics 20 was implemented the closed loop driving, this drove the feedback of signal to the difference between driving signal and the response signal as correction.For example, the phase differential between this driving signal and the response signal can comprise this feedback.Ideally, under no-flow condition, if flowmeter is calibrated exactly, this phase differential will be zero substantially so.
Driving circuit 220 can produce the driving signal.In one embodiment, this driving signal comprises that the operation that is produced by this driving circuit 220 drives signal, and wherein this signal makes flow duct 103 vibrations.In circuit for signal conditioning 202, can receive the response signal of consequent this driving signal.Perhaps, can produce this driving signal for fault test especially according to the present invention.
Circuit for signal conditioning 202 all receives response signal from detecting sensor 201a and 201b.This circuit for signal conditioning 202 can detect and/or process described response signal.This circuit for signal conditioning 202 can be processed described response signal in order to produce suitable flow measurement.In addition, according to embodiments of the invention, this circuit for signal conditioning 202 can process described response signal so that the fault in the detection streamer circuit 205.
Can produce response signal by detecting the normal running of sensor 201 according to flowmeter 5.Perhaps, can produce described response signal by detecting any type of test vibration of sensor 201 in response to flow duct 103.In another kind of replacement scheme, can produce described response signal in response to the Injection Signal from signal injection device 203 by detecting sensor 201.
Circuit for signal conditioning 202 can be each and detects sensor and determine the response signal amplitude.Circuit for signal conditioning 202 can determine that detecting sensor 201a and second from first detects phase differential between the response signal that sensor 201b receives.Described amplitude is connected the directed fault of connection in definite cable line 205 with phase differential.
In one embodiment, meter electronics 20 can comprise processor (not shown) and cable fault diagnostic software program.This processor can be carried out cable fault diagnostic software program and can start and monitor electric wire open circuit and the mensuration that is connected directed fault for cable line 205.This cable fault diagnostic software program can start and enters the signal that detects among sensor 201a and the 201b.Described processor is connected from electric wire open circuit and is connected directed fault test and receives measured value/data with program, and can carry out suitable fault and determine.If the problem of detecting, then described processor and program can produce alarm.In addition, described processor and program can be implemented compensation technique, comprise making signal or signal response upset in order to compensate unsuitable wiring orientation.Perhaps, circuit for signal conditioning 202, signal injection device 203, driving circuit 220 and processor can comprise the special circuit parts of equivalent electrical circuit and/or realization aforesaid operations.
Fig. 3 is the process flow diagram 300 of the method for detection of the cable fault in the cable line of flowmeter according to an embodiment of the invention.In the method, detecting the electric wire open fault determines.Detect the test of electric wire open fault and can detect the electric wire open fault, for example the corresponding electric wire that detects the broken string in the electric wire or do not connect of cable line 205.
In step 301, Injection Signal is sent to one or more of cable line 205 and detects in the electric wire.Therefore, this Injection Signal is transmitted to first and detects at least one that sensor 201a and second detects sensor 201b.For example, this Injection Signal can be produced by signal injection device 203.When Injection Signal was produced by signal injection device 203, circuit for signal conditioning 202 should receive response signal from detecting sensor 201a and 201b basically simultaneously.
In step 302, response signal detects amplitude threshold and compares with predetermined.Only have when detecting electric wire and do not open a way, sending to the Injection Signal that detects sensor 201 just can be that circuit for signal conditioning 202 produces two different return signals.First signal (Injection Signal component) is the reflection of Injection Signal and basically is in identical frequency with Injection Signal.Do not open a way if detect electric wire, this Injection Signal component should be similar to Injection Signal and therefore can compare with threshold value on amplitude so.Because the yo-yo effect of flow duct 103 and because the impact of the stream material of flow channel 103, secondary signal are the response signal components and are different from original Injection Signal in frequency.Yet this response signal component can and may be undetectable in the amplitude variation in some cases.Therefore, in one embodiment, the Injection Signal component of response signal is used for comparing.
In step 303, if being no more than, the Injection Signal component is scheduled to detect amplitude threshold, so described method proceeds to step 304.In step 304, determine that response signal is received and determine the corresponding electric wire that detects sensor be disconnect or do not connect.Otherwise if the Injection Signal component surpasses the predetermined amplitude threshold that detects, so described method shifts walks around step 304.Therefore, determine that response signal is received and determine to detect accordingly electric wire be do not disconnect or be not connect.
In step 304, because the Injection Signal component surpasses and predeterminedly detects amplitude threshold, be determined and have the electric wire open fault so detect accordingly electric wire.Subsequently, meter electronics 20 can be carried out other effect, comprises the alarm that produces indication electric wire open fault.
Under the single situation that detects sensor and single response signal amplitude, above-mentioned steps has been discussed.Yet should be appreciated that can be to from the equal implementation step 302-304 of the response signal that detects sensor 201a and 201b.
Fig. 4 is the process flow diagram 400 of the method for detection of the cable fault in the cable line of flowmeter according to an embodiment of the invention.In the method, detecting sensor connects directed fault and determines.
In step 401, the driving signal that applies in response to driver 204 detects sensor reception response signal via cable line 205 from one or two.
Under the no-flow condition, the phase differential between left and right (or first and second) detecting signal will be zero substantially in flowmeter 5.Under flox condition, according to the mass flowrate of the stream material that passes through flowmeter 5, the phase place of the first detecting signal will little amount relative to the phase phasic difference of the second detecting signal.Yet, if the phase differential between these two detecting signals is excessive, so just exist to connect directed fault.
In step 402, phase differential detects phase difference threshold and compares with predetermined.This phase differential comprises the difference between response signal phase place and the driving signal phase.
In step 403, if surpassing, this phase differential is scheduled to detect phase difference threshold, so described method proceeds to step 404.If this phase differential is no more than the predetermined phase difference threshold that detects, so described method shifts walks around step 404.
In step 404, because phase differential surpasses the predetermined phase difference threshold that detects, connect directed fault so determine to detect accordingly to exist in the electric wire.For example, described two response signals can have the phase differential of about 180 degree, add or deduct the caused relatively little phase differential part of response of the stream material in the flow pipeline 103.As previously mentioned, connect directed fault if determine to exist, then can produce alert consitions.In addition, meter electronics 20 can make all subsequent response signals upsets that detect the sensor reception from affected.Like this, can correct unsuitable connection orientation.
Under the single situation that detects sensor and single phase differential, above-mentioned steps has been discussed.Yet should be appreciated that can be to from the equal implementation step 402-404 of the response signal that detects sensor 201a and 201b.
Fig. 5 is the process flow diagram 500 of the method for detection of the cable fault in the cable line 205 of flowmeter according to an embodiment of the invention.In the method, carrying out driver electric wire open fault determines.The test of driver electric wire open fault can detect the electric wire open fault, for example broken string or the not electric wire of connection.
In step 501, drive in the one or more driver electric wire that signal is sent to cable line 205 and send driver 204 to.This drives signal and can be produced by driving circuit 220, as previously mentioned.Drive signal and can comprise that normal running drives signal or can comprise that being suitable for the electric wire open fault tests any signal that produces.
Return with reference to figure 2, driving circuit 220 comprises the driving resistance R in output terminal
D Operational amplifier 221 cross-over connections drive resistance R
DIn one embodiment, operational amplifier 221 amplifies leap driving resistance R
DVoltage and output drive resistive voltage.This driving resistive voltage can comprise the analog voltage signal that can compare with predetermined voltage threshold.
Refer again to Fig. 5, in step 502, cross over and drive resistance R
DDriving resistive voltage and predetermined voltage threshold compare.If the driving resistive voltage at the output of operational amplifier 221 surpasses predetermined voltage threshold, the electric current of expected level just flows to driver 204 by cable line 205 so.
In step 503, be no more than predetermined voltage threshold if drive resistive voltage, so described method proceeds to step 504.Otherwise, surpass predetermined voltage threshold if drive resistive voltage, can determine so not exist the electric wire open loop state, therefore described method shifts walks around step 504.
In step 504, be no more than predetermined voltage threshold because drive resistive voltage, so can determine in the cable line 205 that leads to driver 204, to exist driver electric wire open loop state.This step can comprise the generation alert consitions, as previously mentioned.
Perhaps, operational amplifier 221 can comprise comparator device, and this comparator device will drive resistance R
DThe voltage of cable line one side and a certain voltage (that is, predetermined voltage threshold) compare and produce the output of true or false numeral.Therefore, surpass predetermined voltage if drive resistive voltage, then should numeral output comprise the first digital output level, be no more than predetermined voltage if drive resistive voltage, then should numeral output comprise the second digital output level.Compare the inside that relatively therefore can comprise comparator device of step 502, and wherein, predetermined voltage threshold comprises the relatively voltage input of apparatus.
Fig. 6 is the process flow diagram 600 of the method for detection of the cable fault in the cable line of flowmeter according to an embodiment of the invention.In the method, carrying out driver connects directed fault and determines.
In step 601, driving circuit 220 produces to drive signal and should drive signal via cable line 205 and sends driver 204 to, as previously mentioned.Therefore, driver 204 uses this driving signal to produce physical stimulus in flow duct 103A and 103B.Thereby circuit for signal conditioning 202 detects sensor 201a and 201b receive first and second response signals via cable line 205 from first and second in response to the vibration of the flow duct that is caused by driver 204.
In step 602, response signal phase differential and predetermined drive phase difference limen value compare.This response signal phase differential comprises the difference between response signal phase place and the driving signal phase.This driving signal phase provides the phase propetry to driving circuit 220, that is, this driving signal phase is the driving phase place that driving circuit 220 and driver 204 will reach.The actual phase of response should be near this phase place, and different aspect the mass flowrate of general stream material in flow duct 103.
In step 603, if the response signal phase differential surpasses predetermined drive phase difference limen value, then determine in the driver electric wire, to have driver to connect directed fault, and described method proceed to step 604.Otherwise, if the response signal phase differential is no more than predetermined drive phase difference limen value, determine that then it is correct that driver connects orientation, and step 604 is walked around in the transfer of described method.
In step 604, because the response signal phase differential surpasses predetermined drive phase difference limen value, so determine in the driver electric wire, to exist driver to connect directed fault.For example, this phase differential can have the phase differential of about 180 degree, adds or deduct the caused relatively little phase differential part of response of the stream material in the flow pipeline 103.As previously mentioned, connect directed fault if determine to exist, then can produce alert consitions.In addition, meter electronics 20 can make and drive the signal upset.For example, driving signal can be reversed before it sends to driver 204.Like this, can correct unsuitable driver connects directed.
Should be appreciated that either method among Fig. 6 or Fig. 7 can be used for carrying out driver and connects directed fault and determine.
Fig. 7 is the process flow diagram 700 of the method for detection of the cable fault in the cable line of flowmeter according to an embodiment of the invention.In the method, carrying out driver connects directed fault and determines.
In step 701, determine the vibratory response amplitude.This vibratory response amplitude can comprise the amplitude from the response signal of arbitrary sensor.
In step 702, this vibratory response amplitude and drive signal amplitude compare.Described relatively can be comparison in two amplitudes at one or more instantaneous time points place.Perhaps, described comparison can the value of averaging or the comparison of filter value etc.
In step 703, if the vibratory response amplitude is followed the tracks of drive signal amplitude basically, then described method withdraws from.If the vibratory response amplitude is not followed the tracks of drive signal amplitude basically, then described method proceeds to step 704.
In step 704, because the vibratory response amplitude is not followed the tracks of drive signal amplitude basically, so determine in the driver electric wire, to exist driver to connect directed fault.As previously mentioned, if determine to exist driver to connect directed fault, then can produce alert consitions.In addition, meter electronics 20 can make and drive the signal upset.For example, driving signal can be reversed before it sends to driver 204.Like this, can correct unsuitable driver connects directed.
Fig. 8 illustrates flowmeter 5 according to an embodiment of the invention.The parts identical with Fig. 2 have identical Reference numeral.In this embodiment, signal injection device 203 comprises digital-to-analogue (D/A) converter 808, Injection Signal generator 806 and transformer 807.D/A 808 is connected to circuit for signal conditioning 202 and is connected to Injection Signal generator 806.Injection Signal generator 806 is also connected to transformer 807.
D/A 808 receives the numerical frequency instruction from circuit for signal conditioning 202.D/A 808 is the frequency input that enters in the Injection Signal generator 806 with this numerical frequency instruction transformation, wherein, and the frequency of (single) Injection Signal that this frequency input regulation will produce.Injection Signal generator 806 produces Injection Signal and this Injection Signal is transferred to the armature winding 810 of transformer 807.
Claims (23)
1. the meter electronics (20) of the cable fault in the cable line for detection of flowmeter (5) (205), described meter electronics (20) comprises that driver (204), first and second detects sensor (201a, 201b), described cable line (205) is connected to described first and second and detects sensor (201a, 201b) and be connected to described driver (204), and described meter electronics (20) is characterised in that:
Driving circuit (220), described driving circuit (220) are connected to described cable line (205) and are configured to produce to drive signal and are sent to described driving signal in the described cable line (205) and send described driver (204) to; With
Be connected to the circuit for signal conditioning (202) of described cable line (205), described circuit for signal conditioning (202) is configured to receive at least one response signal in response to described driving signal from described first and second at least one that detect sensor (201a, 201b), and the driver electric wire open fault in the one or more driver electric wire of definite described cable line (205) is connected in the directed fault one or more with driver.
2. meter electronics according to claim 1 (20), it is characterized in that, driving resistive voltage and predetermined voltage threshold that described circuit for signal conditioning (202) is configured to cross over the driving resistance R D of described driving circuit output compare, if described driving resistive voltage does not surpass described predetermined voltage threshold, then determine the driver electric wire open fault in the described one or more driver electric wire.
3. meter electronics according to claim 1 (20), it is characterized in that, described circuit for signal conditioning (202) is configured to response signal phase differential and predetermined drive phase difference limen value are compared, if described response signal phase differential surpasses described predetermined drive phase difference limen value, determine that then the driver in the described one or more driver electric wire connects directed fault, described response signal phase differential comprises the difference between response signal phase place and the driving signal phase, detects sensor and described second from described first and detects sensor (201a, 201b) at least one receives described response signal phase place.
4. meter electronics according to claim 1 (20), it is characterized in that, described meter electronics (20) also is configured to determine the vibratory response amplitude of vibratory response, if described vibratory response amplitude is not followed the tracks of drive signal amplitude basically, determine that then the driver in the described one or more driver electric wire connects directed fault.
5. meter electronics according to claim 1 (20) is characterized in that, if determine to exist driver to connect directed fault, then described driving circuit (220) also is configured to make the upset of driving signal.
6. method for detection of the cable fault in the cable line of flowmeter, described method is characterised in that:
Produce and a kind ofly drive signal and described driving signal is sent in the one or more driver electric wire of cable line and is sent in a kind of driver;
The driving resistance R at described driver output end place will be crossed over
DDriving resistive voltage and predetermined voltage threshold compare, and produce in response to described driving signal and to cross over described driving resistance R
DThe driving resistive voltage; And
If cross over described driving resistance R
DDescribed driving resistive voltage surpass described predetermined voltage threshold, then determine the driver electric wire open fault in the described one or more driver electric wire.
7. method according to claim 6 characterized by further comprising: if determine to exist driver electric wire open fault, then produce alarm.
8. method for detection of the cable fault in the cable line of flowmeter, described method is characterised in that:
Produce a kind of driving signal and be sent to described driving signal in the cable line and be sent in a kind of driver;
Receive at least one response signal in response to described driving signal from first at least one that detects that sensor and second detects the sensor; And
Response signal phase differential and predetermined drive phase difference limen value are compared, described response signal phase differential comprises the response signal phase place and drives difference between the signal phase, receives described response signal phase place from first at least one that detects that sensor and second detects the sensor; And
If described response signal phase differential surpasses described predetermined drive phase difference limen value, determine that then the driver in the one or more driver electric wire connects directed fault.
9. method according to claim 8 characterized by further comprising: if determine to exist driver to connect directed fault, then produce alarm.
10. method according to claim 8 characterized by further comprising: described determine after, if determine to exist driver to connect directed fault, then make the driving signal upset from driving circuit.
11. the method for detection of the cable fault in the cable line of flowmeter, described method is characterised in that:
Produce a kind of driving signal and be sent to described driving signal in the cable line and be sent in a kind of driver;
Receive at least one response signal in response to described driving signal;
Determine the vibratory response amplitude of described at least one response signal; And
If described vibratory response amplitude is not followed the tracks of drive signal amplitude basically, determine that then the driver in the one or more driver electric wire connects directed fault.
12. method according to claim 11 characterized by further comprising: if determine to exist driver to connect directed fault, then produce alarm.
13. method according to claim 11 characterized by further comprising: described determine after, if determine to exist driver to connect directed fault, then make the driving signal upset from driving circuit.
14. the method for detection of the cable fault in the cable line of flowmeter, described method is characterised in that:
Test one or more the first of described cable line and detect electric wire and one or more the second and detect electric wire for detecting the electric wire open fault, described one or more the first detect electric wire and described one or more the second detects electric wire and is included in the described cable line and is connected respectively to first and detect sensor and second and detect sensor;
Detect and determine not detect the electric wire open fault in the electric wire if detect electric wire and described one or more the second described one or more the first, then connect directed fault test described one or more the first and detect electric wire and described one or more the second and detect electric wire for detecting;
Produce a kind of driving signal and be sent to described driving signal in the cable line and be sent in a kind of driver;
Receive at least one response signal in response to described driving signal from first at least one that detects that sensor and second detects the sensor;
Test one or more driver electric wire of described cable line for driver electric wire open fault; And
If in described one or more driver electric wire, determine not have driver electric wire open fault, then connect the described one or more driver electric wire of directed fault test for driver.
15. method according to claim 14 characterized by further comprising: have the electric wire open fault if determine to detect in the electric wire or in described one or more driver electric wire described one or more the first, then produce alarm.
16. method according to claim 14, characterized by further comprising: if determine to detect in the electric wire described one or more the first, detect in the electric wire or in described one or more driver electric wire, exist described one or more the second and connect directed fault, then produce alarm.
17. method according to claim 14 is characterized in that, describedly comprises for detecting the one or more sensors that detect of electric wire open fault test:
To detect the Injection Signal component that sensor and described second detects the response signal of at least one reception the sensor from described first detects amplitude threshold and compares with predetermined; And
If described Injection Signal component surpasses the described predetermined amplitude threshold that detects, determine that then corresponding one or more the first detect electric wire or corresponding one or more the second and detect and detect the electric wire open fault in the electric wire.
18. method according to claim 14 is characterized in that, describedly connects directed fault test described one or more the first and detects electric wire and described one or more the second and detect electric wire and comprise for detecting:
Detect first of response signal with first and detect response phase and second and detect the phase differential that second of response signal detects between the response phase and detect phase difference threshold and compare with predetermined, and detect sensor via described cable line from described first and receive described first and detect response signal and detect sensor via described cable line from described second and receive described second and detect response signal; And
Detect phase difference threshold if described phase differential surpasses described being scheduled to, then determine to detect the directed fault of connection.
19. method according to claim 14, characterized by further comprising: described for detect connect directed fault test after, connect directed fault if determine to exist to detect, then make to come from and test the described response signal upset that detects sensor that connects directed fault that detects from its cable line.
20. method according to claim 14 is characterized in that, comprises for the described driver of electric wire open test:
The driving resistance R at described driver output end place will be crossed over
DDriving resistive voltage and predetermined voltage threshold compare; And
If described driving resistive voltage does not surpass described predetermined voltage threshold, then determine the driver electric wire open fault in the described one or more driver electric wire.
21. method according to claim 14 is characterized in that, describedly connects the described one or more driver electric wire of directed fault test for driver and comprises:
Response signal phase differential and predetermined drive phase difference limen value are compared, described response signal phase differential comprises the response signal phase place and drives difference between the signal phase, receives described response signal phase place from described first at least one that detects that sensor and described second detects the sensor; And
If described response signal phase differential surpasses described predetermined drive phase difference limen value, determine that then the driver in the one or more driver electric wire connects directed fault.
22. method according to claim 14 is characterized in that, describedly connects the described one or more driver electric wire of directed fault test for driver and comprises:
Determine the vibratory response amplitude of vibratory response; And
If described vibratory response amplitude is not followed the tracks of drive signal amplitude basically, determine that then the driver in the one or more driver electric wire connects directed fault.
23. method according to claim 14, characterized by further comprising: described connect the described one or more driver electric wire of directed fault test for driver after, if determine to exist driver to connect directed fault, then make the driving signal upset from described driver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010261048 CN101937043B (en) | 2006-02-27 | 2006-02-27 | Flowmeter and method for detecting cable faults in cable line of flowmeter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010261048 CN101937043B (en) | 2006-02-27 | 2006-02-27 | Flowmeter and method for detecting cable faults in cable line of flowmeter |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2006800534695A Division CN101421593B (en) | 2006-02-27 | 2006-02-27 | Flow meter and method for detecting a cable fault in a cabling of the flow meter |
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| CN101937043A CN101937043A (en) | 2011-01-05 |
| CN101937043B true CN101937043B (en) | 2013-09-18 |
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| DE102016114647A1 (en) * | 2016-08-08 | 2018-02-08 | Krohne Messtechnik Gmbh | Method for operating a measuring device and measuring device |
| DE102017115147A1 (en) * | 2017-07-06 | 2019-01-10 | Endress+Hauser SE+Co. KG | Condition monitoring of a coil in a sensor |
| CN107449454A (en) * | 2017-08-30 | 2017-12-08 | 红云红河烟草(集团)有限责任公司 | A kind of ROFA transport trolleys high frequency cable Anti-scratching detection means and method |
| CN109163648A (en) * | 2018-08-24 | 2019-01-08 | 中国飞机强度研究所 | Displacement measurement fault detection method and device |
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| US4599696A (en) * | 1982-09-30 | 1986-07-08 | Fuji Jukogyo Kabushiki Kaisha | System for diagnosing an internal combustion engine |
| US4996871A (en) * | 1989-06-02 | 1991-03-05 | Micro Motion, Inc. | Coriolis densimeter having substantially increased noise immunity |
| CN1166199A (en) * | 1994-08-12 | 1997-11-26 | 微动公司 | Method and appts. for fault detection and correction in coriolis effect mass flowmeters |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4599696A (en) * | 1982-09-30 | 1986-07-08 | Fuji Jukogyo Kabushiki Kaisha | System for diagnosing an internal combustion engine |
| US4996871A (en) * | 1989-06-02 | 1991-03-05 | Micro Motion, Inc. | Coriolis densimeter having substantially increased noise immunity |
| CN1166199A (en) * | 1994-08-12 | 1997-11-26 | 微动公司 | Method and appts. for fault detection and correction in coriolis effect mass flowmeters |
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