CN106895896A - The e measurement technology of mass flowmenter self-correcting zero - Google Patents
The e measurement technology of mass flowmenter self-correcting zero Download PDFInfo
- Publication number
- CN106895896A CN106895896A CN201710124199.2A CN201710124199A CN106895896A CN 106895896 A CN106895896 A CN 106895896A CN 201710124199 A CN201710124199 A CN 201710124199A CN 106895896 A CN106895896 A CN 106895896A
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- CN
- China
- Prior art keywords
- transmitter
- zero
- circuit
- self
- correcting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
- G01F1/8436—Coriolis or gyroscopic mass flowmeters constructional details signal processing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/02—Compensating or correcting for variations in pressure, density or temperature
- G01F15/022—Compensating or correcting for variations in pressure, density or temperature using electrical means
- G01F15/024—Compensating or correcting for variations in pressure, density or temperature using electrical means involving digital counting
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Measuring Volume Flow (AREA)
- Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
Abstract
The present invention relates to a kind of e measurement technology of mass flowmenter transmitter self-correcting zero, its particular content is to add the hardware circuit of self-correcting zero in transmitter analog signal input channel front end, is calibrated automatically for completing transmitter zero-bit；In two analog signal input channel front ends of A, B of transducer portion, the hardware circuit of self-correcting zero is accessed；During normal work, two-way sensor signal is passed through, and self-correcting zero circuit does not work；Change when transmitter temperatures, when the transmitter working time distance last zeroing time exceedes threshold values, hardware automatic zero circuit startup work；B roads analog signal input channel is blocked at automatic zero circuit, and A roads analog signal input channel is input to A, B two-way analog signal input channel parallel, coordinates software processing, it is possible to carry out real-time tracking compensation to transmitter zero-bit.The tracing compensation effectively realized to transmitter zero-bit of the invention, so as to the long-time stability of transmitter certainty of measurement are effectively ensured.
Description
Technical field
The invention belongs to mass flow meter measurement technology category, and in particular to a kind of mass flowmenter self-correcting zero measures skill
Art.
Technical background
Coriolis flowmeter can be used to measure the arbitrary medium for flowing through vibration tube, including liquid, gas and two phase flow
Medium.Theoretically, either liquid medium or gas medium, mass flowmenter can be measured well.And
Qualified instrument is demarcated using same medium, can be used among the measurement of arbitrary medium and invariable precision.Limit
In the operation principle of mass flow meter sensor, liquid medium can be measured well.For the light substances such as gas, its
Measurement has very big difference with liquid：Gas density very little, lighter weight is influenceed much greater during gasmetry by null offset.
On the premise of identical mass flow, gas medium has flow velocity and the bigger pressure loss higher.So sensor detection
Signal is easier to be buried by noise.Gasmetry is stressed, temperature influence is bigger.Therefore, use quality flowmeter is wanted long
Time carries out accurately measuring it is necessary to there is preferably measuring method to gas.
Through analysis and experimental verification, transmitter zero drift（Abbreviation drift）There is considerable influence to gasmetry precision.Become
Device drift is sent essentially from two aspects：First, the part characteristic that transmitter temperatures change causes（As amplifier multiplication factor,
Resistance, electric capacity etc.）The micro- change of generation so that two paths signal produces deviation in signal transacting, so as to cause measurement error；Its
Two, the transmitter zero-bit brought due to time change is changed（Floated during abbreviation）.Transmitter hardware is taken in drift to transmitter
Circuit zero-bit tracing is solved.
The content of the invention
The technical problems to be solved by the invention are：Existing transmitter drift in the application process of mass flowmenter, meeting
Certainty of measurement to mass flowmenter is impacted.
In order to solve the above technical problems, the technical solution used in the present invention is：There is provided a kind of mass flowmenter automatic school
Zero e measurement technology；Specifically use transmitter hardware zero-bit tracing:Mainly solve the drift of mass flowmenter transmitter to it is long when
Between measurement result influence, mainly realized using hardware circuit method.Its particular content is：It is logical in the input of transmitter analog signal
Road front end adds the hardware circuit of self-correcting zero, is calibrated automatically for completing transmitter zero-bit.
The hardware circuit of the self-correcting zero is made up of following five part：Transmitter temperature measurement circuit, transmitter microprocessor CPU,
Transmitter timing electricity, the control of transmitter self-correcting zero circuit, the execution circuit of self-correcting zero；
The transmitter temperature measurement circuit, is made up of a temperature sensor, can be changed with temperature sensor and exported corresponding signal to
CPU。
The transmitter timing circuit：It is made up of timer, work is started when transmitter returns to zero, records transmitter from tune
Zero real time till now.
The transmitter self-correcting zero controls circuit, and mainly the aggregate-value of the variable quantity according to temperature and time is compared and sentences
It is disconnected, when variable quantity therein exceedes default threshold values, then control signal is sent, start self-correcting zero circuit.
The execution circuit of the self-correcting zero, when blocking B road signals at automatic zero circuit, normal transmission；And in automatic school
A roads signal parallel is linked into A, B two paths at zero circuit.In follow-up signal transacting, two signal processing channels of A, B
Same a-signal is processed, the result is recorded as real-time zero-bit, so far, automatic zero adjustment work is completed.
During normal work, the two-way analog signal of sensor output is through transducer signal treatment channel（Signal amplifies, filter
Ripple, shaping etc.）Early stage treatment conversion is carried out, computing is carried out subsequently into follow-up cpu circuit.The hardware circuit of now self-correcting zero does not rise
Effect.When transmitter exceedes certain threshold values because of the zero drift that temperature change or time change cause, the zero-bit that hardware is accessed
Tracking circuit start work, completes transmitter self-correcting odd-job and makees.
The beneficial effects of the invention are as follows：The tracing compensation to transmitter zero-bit is effectively realized, so as to transmitter is effectively ensured
The long-time stability of certainty of measurement；The hardware circuit startup threshold values can preset, and can artificially adjust；If the valve
Value sets relatively low, and zero-bit tracking is more real-time, but the startup of self-correcting zero circuit is also more frequent.
Brief description of the drawings
Fig. 1 is mass flowmenter transmitter self-correcting zero circuit block diagram；
Fig. 2 is mass flowmenter transmitter hardware circuit block diagram；
In figure, 1 transmitter temperature measurement circuit；2nd, transmitter microprocessor CPU；3rd, transmitter timing circuit；4th, transmitter self-correcting zero
Control circuit；5th, the execution circuit of self-correcting zero.
Specific implementation method
The e measurement technology of mass flowmenter self-correcting zero given by the present invention is illustrated below in conjunction with accompanying drawing, as shown in figure 1,
In two signal processing channel front ends of transmitter, self-correcting zero circuit is added.In self-correcting zero circuit：Transmitter temperature measurement circuit 1 is examined
Survey transmitter actual temperature and be real-time transmitted to transmitter microprocessor CPU 2；Transmitter timing circuit 3 is recorded from last zero
Calibration actual run time till now, and it is real-time transmitted to transmitter microprocessor CPU 2；Set in advance in transmitter software
Putting temperature change allowed band and time operation allows interval, used as self-correcting zero start threshold values；When transmitter temperatures excursion
Or transmitter run time exceed in advance set threshold values when, transmitter microprocessor CPU 2 send control command to transmitter from
School zero controls circuit 4, the control circuit of transmitter self-correcting zero to restart zero execution circuit of self-correcting 5 and complete transmitter self-correcting odd-job work,
The process of self-correcting zero terminates.
During normal work, as shown in Fig. 2 A, B two paths of signals of sensor output enter follow-up each via two passages
Circuit is processed, and self-correcting zero circuit does not work now.When transmitter temperature measurement circuit or transmitter timing circuit detected value are super
Cross the threshold values of prior setting（The threshold values can artificially be adjusted according to actual conditions）When, the measurement error that transmitter drift brings will not
Can ignore, now hardware automatic zero circuit startup work：Two signalling channel working conditions of A, B change, wherein all the way
Input signal is blocked, and another road signal parallel is input to A, B two paths, coordinates software processing, it is possible to transmitter zero
Position is tracked compensation.Transmitter self-correcting zero circuit energy real-time tracking transmitter zero-bit change, effectively eliminate because temperature drift and when float
So that the measurement error that the change of transmitter zero-bit brings, refer to certainty of measurement to a certain extent.
Claims (5)
1. a kind of mass flowmenter automatic zero adjustment e measurement technology, it is characterised in that：Particular content is A, the B two in transducer portion
Individual analog signal input channel front end, accesses the hardware circuit of self-correcting zero；During normal work, two-way sensor signal is passed through,
Self-correcting zero circuit does not work；Change when transmitter temperatures, the transmitter working time distance last zeroing time exceedes
During threshold values, hardware automatic zero circuit startup work；B roads analog signal input channel is blocked at automatic zero circuit, A roads
Analog signal input channel is input to A, B two-way analog signal input channel parallel, coordinates software processing, it is possible to transmitter
Zero-bit carries out real-time tracking compensation；
The hardware circuit of the self-correcting zero is by transmitter temperature measurement circuit, transmitter microprocessor CPU, transmitter timing circuit, pick-up
Device self-correcting zero controls circuit and the part of zero execution circuit of self-correcting five composition；Wherein transmitter temperature measurement circuit, transmitter timing circuit
Respectively at the connection of transmitter microprocessor CPU, another transmitter microprocessor CPU is connected with the control circuit of transmitter self-correcting zero, and
The control circuit of transmitter self-correcting zero connects two execution circuits of self-correcting zero again；
Two execution circuits of self-correcting zero in the execution circuit of the self-correcting zero connect A, B two paths respectively；In automatic zero adjustment electricity
When blocking B road signals at road, normal transmission, and A roads signal parallel is linked into A, B two paths at automatic zero circuit；
In follow-up signal transacting, two signal processing channels of A, B are processed same a-signal, and the result is by as real
When zero-bit record, then automatic zero adjustment work complete.
2. a kind of mass flowmenter automatic zero adjustment e measurement technology according to claim 1, it is characterised in that the transmitter
Temperature measurement circuit, is made up of a temperature sensor, and temperature sensor changes and exports corresponding signal gives transmitter microprocessor CPU.
3. a kind of mass flowmenter automatic zero adjustment e measurement technology according to claim 1, it is characterised in that the transmitter
Timing circuit is made up of timer, and work, real time of the record transmitter from zeroing till now are started when transmitter returns to zero.
4. a kind of mass flowmenter automatic zero adjustment e measurement technology according to claim 1, it is characterised in that the transmitter
Self-correcting zero controls circuit, and the aggregate-value of variable quantity and time according to temperature is compared judgement, when variable quantity therein exceedes
During default threshold values, then control signal is sent, start self-correcting zero circuit.
5. a kind of mass flowmenter automatic zero adjustment e measurement technology according to claim 1, it is characterised in that the self-correcting zero
The temperature change allowed band and time operation that hardware circuit is set in advance in transmitter software allow interval, used as self-correcting zero
Startup threshold values.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710124199.2A CN106895896A (en) | 2017-03-03 | 2017-03-03 | The e measurement technology of mass flowmenter self-correcting zero |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710124199.2A CN106895896A (en) | 2017-03-03 | 2017-03-03 | The e measurement technology of mass flowmenter self-correcting zero |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106895896A true CN106895896A (en) | 2017-06-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710124199.2A Pending CN106895896A (en) | 2017-03-03 | 2017-03-03 | The e measurement technology of mass flowmenter self-correcting zero |
Country Status (1)
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| CN (1) | CN106895896A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111061212A (en) * | 2019-12-31 | 2020-04-24 | 盛瑞传动股份有限公司 | Automatic calibration control method and device based on highly integrated measurement system |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05149767A (en) * | 1991-11-20 | 1993-06-15 | Ckd Corp | Mass flowmeter |
| DE4226391A1 (en) * | 1992-08-10 | 1994-02-17 | Wolfgang Drahm | Detecting zero-point drift for correcting vibration phase shift in Coriolis mass flow meter - measuring additional vibration characteristic parameters e.g. amplitude or DC components using light source-photosensor light valve and correcting using e.g. difference |
| JPH08338749A (en) * | 1995-06-14 | 1996-12-24 | Oval Corp | Coriolis flowmeter |
| CN1145472A (en) * | 1995-09-14 | 1997-03-19 | 株式会社椭圆 | Mass flowmeter converter |
| CN1820187A (en) * | 2003-08-29 | 2006-08-16 | 微动公司 | Method and device for correcting output information of flow measurement apparatus |
| JP4715491B2 (en) * | 2005-12-12 | 2011-07-06 | 株式会社タツノ・メカトロニクス | Coriolis mass flow meter |
| WO2016025919A1 (en) * | 2014-08-14 | 2016-02-18 | Soneter, Inc | Methods and apparatus for fluid flow monitoring and leak detection |
| CN106471344A (en) * | 2014-07-14 | 2017-03-01 | 高准公司 | For determining device and the correlation technique of the difference zero migration in vibrating flowmeter |
-
2017
- 2017-03-03 CN CN201710124199.2A patent/CN106895896A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05149767A (en) * | 1991-11-20 | 1993-06-15 | Ckd Corp | Mass flowmeter |
| DE4226391A1 (en) * | 1992-08-10 | 1994-02-17 | Wolfgang Drahm | Detecting zero-point drift for correcting vibration phase shift in Coriolis mass flow meter - measuring additional vibration characteristic parameters e.g. amplitude or DC components using light source-photosensor light valve and correcting using e.g. difference |
| JPH08338749A (en) * | 1995-06-14 | 1996-12-24 | Oval Corp | Coriolis flowmeter |
| CN1145472A (en) * | 1995-09-14 | 1997-03-19 | 株式会社椭圆 | Mass flowmeter converter |
| CN1820187A (en) * | 2003-08-29 | 2006-08-16 | 微动公司 | Method and device for correcting output information of flow measurement apparatus |
| JP4715491B2 (en) * | 2005-12-12 | 2011-07-06 | 株式会社タツノ・メカトロニクス | Coriolis mass flow meter |
| CN106471344A (en) * | 2014-07-14 | 2017-03-01 | 高准公司 | For determining device and the correlation technique of the difference zero migration in vibrating flowmeter |
| WO2016025919A1 (en) * | 2014-08-14 | 2016-02-18 | Soneter, Inc | Methods and apparatus for fluid flow monitoring and leak detection |
Non-Patent Citations (1)
| Title |
|---|
| 郭海文 等: "质量流量计气体测量研究", 《仪器仪表用户》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111061212A (en) * | 2019-12-31 | 2020-04-24 | 盛瑞传动股份有限公司 | Automatic calibration control method and device based on highly integrated measurement system |
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Application publication date: 20170627 |
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