CN106679770A - Mass calibration system and method for mass flow meter - Google Patents
Mass calibration system and method for mass flow meter Download PDFInfo
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- CN106679770A CN106679770A CN201611039840.4A CN201611039840A CN106679770A CN 106679770 A CN106679770 A CN 106679770A CN 201611039840 A CN201611039840 A CN 201611039840A CN 106679770 A CN106679770 A CN 106679770A
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Classifications
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- 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
- G01F25/14—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters using a weighing apparatus
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Abstract
The invention provides a mass calibration system and method for a mass flow meter. The system comprises a calibration solution device, a solution pump, a plurality of to-be-measured mass flow meters uniformly arranged on a calibration pipeline, an executor switch, a standard flow meter, a computer and an electronic scale. The calibration solution device is used for providing a solution required for mass flow meter calibration; the solution pump is used for enabling a calibration solution to flow in the calibration pipeline; the executor switch is used for adjusting the flow velocity of the calibration solution in the calibration pipeline and adjusting the mass flow rate of the calibration solution per unit time in the calibration pipeline; the standard flow meter is used for providing reference data for mass flow of the calibration solution in the calibration pipeline; the computer is connected with the to-be-measured mass flow meters, the standard flow meter, the executor switch and the electronic scale, and used for generating a control signal to adjust the executor switch according to the reference data and reading the mass flow rates of the to-be-measured mass flow meters and the standard flow meter according to the electronic scale; the electronic scale is used for metering the flow mass of fluid overflowing from a mass flow meter measuring pipe. By means of the system and method, the mass calibration precision and efficiency of the mass flow meter are improved.
Description
Technical field
The invention belongs to instrument calibration technical field, the quality demarcation system of more particularly to a kind of mass flowmenter and side
Method.
Background technology
Coriolis force mass flowmenter is a instrument and meter that applied fluid mechanics principle carrys out R ＆ D design, and its is main
For measuring gas, the mass flow of liquid and density, and volume flow, the total matter that mass flow and density are derived
Parameter needed for the engineerings such as amount, cumulative volume.At this stage, Coriolis force mass flowmenter is except can be used for various Common fluids
Outward, it may also be used for various unconventional fluids, serosity, liquid gas and compressed natural gas, it is widely used in petrochemical industry, papermaking, food
The industry such as product and pharmacy, its measuring accuracy is generally between 0.1-0.5%.Therefore, for Coriolis force mass flowmenter
For raw manufacturer, not only need persistently to improve and improve the design to Coriolis force mass flow meter sensor, production and process
Etc. technique, also the calibration system of the whole machine instrument of Coriolis force mass flowmenter to also be carried out by scientific and reasonable improvement and carried
It is high.Coriolis force mass flowmenter machine product any one production link, including the selection of converter device and welding, pass
The machining of sensor diverter, the shaping of measurement pipe and welding, the design of calibration system pipeline and the selection of calibration facility etc. are all
The linearity, stability, repeatability, precision, temperature drift of final whole machine Coriolis force mass flowmenter etc. can be related to；So testing
The precision and practical sex chromosome mosaicism of card Coriolis force mass flowmenter product and its detection calibration system, then will be by the two point
Come checking.If checking the relevant parameters such as the precision of Coriolis mechanical mass effusion meter, repeatability, stability, then just
There should be a set of detection calibration system for meeting GB；If conversely, to detect Coriolis force mass flowmeter calibration system
The relevant parameter such as precision, repeatability, stability, then should just possess and meet profit mechanical mass flow meter calibration metering essence difficult to understand
The equipment of degree, and the global design error of a whole set of calibration system will should well below the reality of Coriolis force mass flowmenter
Use precision.So can just design reasonable science automation instrument and its calibration system.
As shown in figure 1, for the structural representation of existing Coriolis force mass flowmeter calibration system, wherein, demarcate
Solution containment, for holding the device for demarcating medium solution；Solution pump, provides driving source, it is ensured that demarcate to demarcate medium solution
Medium solution can in calibration pipeline smooth flow；Flow direction switch, controls to demarcate opening for medium solution flowing in calibration pipeline
Close；Calibration pipeline, demarcates the passage that medium solution is flowed through；Mass flowmenter, as Coriolis force mass flowmenter；Fixed base
Frame, fixes the concrete stake of clamping Coriolis force mass flowmenter to be calibrated；Uninterrupted controlling switch, manually adjusts
Its aperture is adjusted, its objective is the size for adjusting medium solution mass flow in calibration pipeline；Electronic scale, metering passes through quality stream
Measure the quality of the medium solution of buret；Drainage switch, discharges the hand switch of the medium solution in electronic scale.
The scaling method flow process of the calibration system in Fig. 1, details are as follows：
Step 1, closes flow direction switch, and mass flowmenter to be calibrated is installed in calibration pipeline according to shown in Fig. 1, and
Calibration pipeline and mass flowmenter mounting flange are made in sealing state, No leakage phenomenon, while, it is ensured that mass flowmenter housing
It is perpendicular to the ground；
Step 2, opens solution pump, will flow direction switch, uninterrupted controlling switch and electronic scale drainage switch adjust to
Maximum opening, makes demarcation medium solution with Peak Flow Rate and is demarcating Bottomhole pressure, maintains the state at least 20 minutes, its objective is
Demarcation medium solution is made full of whole calibration pipeline, for the air in purging line；
Step 3, closes flow direction switch, uninterrupted controlling switch, by the mass flowmenter to be calibrated in calibration pipeline
Transducer is set to automatic zero adjustment state, until it completes automatic zero adjustment；
Step 4, adjusts uninterrupted controlling switch to full gate degree state, when volumetric solution flow is worked as in steady time recording
Maximum phase of the front mass flow meter sensor to be calibrated in maximum stream flow corresponding to sensor measuring tube is poor；
Step 5, by maximum stream flow when sensor measuring tube corresponding to maximum phase difference on the basis of, carry out choose it is to be calibrated
Mass flowmenter flux scale fixed point, respectively maximum stream flow when sensor measuring tube produce maximum phase difference 1.0,0.9,
0.8th, 0.7,0.6,0.5,0.4,0.3,0.2,0.1,0.05 and 0.02 times of point；
Step 6, adjusts the aperture of uninterrupted controlling switch so as to which aperture meets the flow of volumetric solution in calibration pipeline
Mass flow meter sensor measurement pipe can be made to produce 1.0 times of points of maximum phase difference, the flow direction for closing calibration pipeline leading portion is opened
Close, till calibration pipeline electronic scale end is without volumetric solution drippage；
Step 7, opens the flow direction switch of calibration pipeline leading portion, when calibration mass flowmeter sensor is in maximum stream flow
When maximum phase difference corresponding to sensor measuring tube is 1.0 times of points, the demarcation metering of time delay 7-10 minutes is closed flow direction and is opened
Close, till calibration pipeline electronic scale end is without volumetric solution drippage, current all mass flowmenters to be calibrated is recorded successively and is turned
The metering total amount of metered mass total amount and electronic scale on parallel operation；
Step 8, repeat step 6 to step 7 completes the demarcation of other phase contrast fixed points；
Step 9, according to nominal data, calculates the mass flow coefficient of each mass flowmenter to be calibrated of correspondence, and will
Coefficient is write into the EEPROM of mass flowmenter transducer by way of button operation.
Step 10, carries out accuracy detection and the repeatability detection of mass flowmenter.
Step 11, adjusts uninterrupted controlling switch to full gate degree state, records current calibration pipeline and improves quality effusion meter
The biggest quality flow of transducer output；
Step 12, on the basis of biggest quality flow, chooses respectively the and of biggest quality flow 1.0,0.75,0.50,0.25
Accuracy detection and repeated test point of 0.1 times of point as mass flowmenter；
Step 13, adjusts the 1.0 of the biggest quality flow that uninterrupted controlling switch is exported to mass flowmenter transducer
Times point, the metering of time delay 7-10 minutes closes flow direction switch, till calibration pipeline electronic scale end is without solution drips, successively
The quality total amount of output and the metering gross mass of electronic scale are measured on the current all mass flowmenter transducers to be examined and determine of record；
Step 14,1.0 times of points of biggest quality flow repeat metering 3 times, and calculate precision and the repetition of current detection point
Property；
Step 15, repeat step 13 to step 14 completes the detection of other mass flow test points.
In existing Coriolis force mass flowmenter mass flow calibration system, 2 mass flowmenters are accommodated up to
Mass flow is demarcated, and is demarcated in flow process whole, including the regulation of calibrational capacity, the data record in calibration process, calculates phase
Ground coefficient is answered, and demarcates precision and repeatability when completing and detected according to manual operations is needed, will certainly be affected by manual operation
The precision and repeatability of whole machine instrument.In addition, substantial amounts of experiment shows with test, solution pump and calibration pipeline in calibration system
In the operation that production is demarcated, there is a certain amount of air bubble all the time and be brought in calibration pipeline, and the work of solution pump
The phenomenon that the volumetric solution in calibration pipeline produces trickle is also resulted in, these factors greatly reduce whole mass flowmenter
The precision of mass flow calibration system.
The content of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of quality mark of mass flowmenter
Determine system and method, for solving prior art in mass flowmenter when mass flow is demarcated, need artificial operation, cause whole
The efficiency of individual mass flowmeter calibration is low with the low problem of precision.
For achieving the above object and other related purposes, the present invention provides a kind of quality demarcation system of mass flowmenter,
Including：
Volumetric solution device, it is used to provide the volumetric solution needed for mass flowmeter calibration；Solution pump, it is used to provide
Power flows volumetric solution in calibration pipeline with certain pressure；Standard scale, along solution pump outbound course calibrating tube is installed on
On road, it is used to provide reference data for the mass flow of volumetric solution in calibration pipeline；Multiple mass flowmenter edges to be measured
Standard scale outbound course is uniformly installed in the calibration pipeline；Executor switchs, and it is used to control to demarcate molten in calibration pipeline
Whether liquid flows, and is additionally operable to adjust mass flow of the volumetric solution within the unit interval in calibration pipeline；Computer, it connects respectively
Connect mass flowmenter, standard scale, executor's switch and electronic scale；It is used to be switched according to the size adjustment executor of reference data
Aperture, and mass flowmenter to be measured is read according to the electronic scale；Electronic scale, it is connected to executor's switch,
For the flow mass that metered mass flow meter calibration pipeline overflows.
Preferably, executor's switch includes the first executor switch, the second executor switch, first executor
Switch is installed between standard scale and solution pump in calibration pipeline, and it is used to be controlled according to the first control signal of computer export
Whether volumetric solution flows in calibration pipeline；The second executor switch is installed on electronic scale and near its mass flow
On demarcation official road between meter, it is used to be existed according to volumetric solution in the second control signal of computer export regulation calibration pipeline
Mass flow in unit interval.
Preferably, constant pressure and flow tank is provided between the solution pump and executor's switch, it is used to eliminating described demarcates molten
The air bubble of institute's band in trickle and volumetric solution in liquid.
Preferably, each described mass flowmenter is equipped with the fixed machine for supporting its work with the both sides of standard scale
Frame.
Preferably, the electronic scale is connected with the draining control valve by the computer controls.
Preferably, the computer connects respectively executor's switch, standard scale, mass flowmenter, electricity by controlling bus
Sub- scale and draining control valve.
Preferably, the number of the mass flowmenter to be measured is up to five.
The present invention also aims to a kind of quality demarcation method of mass flowmenter is provided, including：
Step 1, according to the type of mass flowmenter to be measured its aperture value and higher limit are arranged；
Step 2, adjusts the first executor switch and the second executor switch, until mass flowmenter No leakage to be measured is
Only；
Step 3, when the first executor switch with the second executor switch adjust to work to the last minute aperture when, until calibrating tube
In the measurement pipe of road, standard scale and mass flowmenter till close bubble-free；
Step 4, when the first executor switch is adjusted to zero point aperture with the second executor switch, obtains standard scale and works as
The first front reading；Whether volumetric solution is flow regime in detection calibration pipeline, if the volumetric solution is the shape that do not flow
During state, then instruct to mass flowmenter broadcast transmission automatic zero adjustment to be measured, and adjust draining control valve and be closed, directly
To automatic zero adjustment is completed；
Step 5, according to the type and range of mass flowmenter to be measured the fixed point of mass flowmenter, the demarcation are chosen
Taken amount journey multiple point is clicked for selected point, wherein, the multiple point includes 1.0,0.9,0.8,0.7,0.6,0.5,0.4,0.3,
0.2nd, 0.1,0.05 and 0.02；
Step 6, demarcates by quality process fixed point of certain selected point, adjusts the first executor switch for aperture of working to the last minute,
Obtain the second current reading of standard scale；Mass flow is held adjusting second according to corresponding to second reading near selected point
The aperture of row device switch, till mass flowmenter to be measured reaches the corresponding quality process fixed point of the selected point；
Step 7, it is zero point aperture to adjust the first executor switch, keeps the aperture of the second executor switch constant, until
Till dripping without volumetric solution between calibration pipeline and electronic scale；
Step 8, removes the gross mass of standard scale and mass flowmenter output to be measured, and records the reading of Current electronic scale
Number is simultaneously reset；
Step 9, adjusts the first executor switch for aperture of working to the last minute, and time delay at preset timed intervals exists mass flowmenter to be measured
The corresponding multiple point of the selected point is that mass flow fixed point is demarcated；
Step 10, it is zero point aperture to adjust the first executor switch, obtains whether the current reading of standard scale is zero, if
When the current reading of the standard scale is to drip without volumetric solution between zero and calibration pipeline and electronic scale, obtains and record per platform
The gross mass of mass flowmenter output to be measured and the gross mass of electronic scale volumetric solution；
Step 11, repeat step 6 to 10, the quality process fixed point for being sequentially completed other selected points is demarcated；According to demarcation
Data calculate the mass flow coefficient of every mass flowmenter, and the mass flow coefficient is stored in into mass flow to be measured
Meter；
Step 12, the range multiple point that mass flowmenter is screened again is selected point, by step 6 to 11 to each selected point
Precision and repeatability detection are carried out, demarcation and the testing result of mass flowmenter to be measured is recorded.
Further, before the step 2, also include：
Whether detection constant pressure and flow tank is in canful pressure constant state, if it is not in canful pressure constant state, opens its row
Air cock, till constant pressure and flow tank is changed into canful constant pressure by solution pump.
As described above, the calibration system and method for the mass flowmenter of the present invention, have the advantages that：
By the calibration system that original manually-operated calibration system is replaced with computer controlled automatic, using computer
The aperture of control signal adjusting actuator switch is sent to reach the flow velocity for controlling volumetric solution in calibration pipeline, in original mark
Determine system at most can only demarcate to two mass flowmenters, and can simultaneously demarcate five now, moreover complete in calibration process
Completely without need to artificially participate in, the efficiency of the demarcation of mass flowmenter is not only increased, mass flowmeter calibration is also greatly improved
Precision；Meanwhile, constant pressure and flow tank is introduced in calibration system, eliminate the volumetric solution tiny stream operationally produced because of solution pump
Stream and the problem of air bubble, inherently improve the stated accuracy of mass flowmenter.
Description of the drawings
Fig. 1 is shown as the structural representation of the existing Coriolis force mass flowmeter calibration system of present invention offer；
Fig. 2 is shown as a kind of calibration system structured flowchart of mass flowmenter of the present invention；
Fig. 3 is shown as a kind of example structure figure of the calibration system of mass flowmenter of the present invention；
Fig. 4 is shown as a kind of scaling method flow chart of mass flowmenter of the present invention.
Specific embodiment
Hereinafter embodiments of the present invention are illustrated by particular specific embodiment, those skilled in the art can be by this explanation
Content disclosed by book understands easily other advantages and effect of the present invention.
Refer to Fig. 2 to Fig. 4.It should be clear that structure, ratio, size depicted in this specification institute accompanying drawings etc., only to
Coordinate the content disclosed in description, so that those skilled in the art understands and reads, being not limited to the present invention can be real
The qualificationss applied, therefore do not have technical essential meaning, the tune of the modification of any structure, the change of proportionate relationship or size
It is whole, in the case where effect that can be generated of the invention and the purpose to be reached is not affected, all should still fall in disclosed skill
In the range of art content is obtained and can covered.Meanwhile, in this specification it is cited as " on ", D score, "left", "right", " centre " and
The term of " one " etc., is merely convenient to understanding for narration, and is not used to limit enforceable scope of the invention, its relativeness
It is altered or modified, under without essence change technology contents, when being also considered as enforceable category of the invention.
Fig. 2 is referred to, the present invention provides a kind of calibration system structured flowchart of mass flowmenter, including：
Volumetric solution device 1, it is used to provide the volumetric solution needed for mass flowmeter calibration；Solution pump 3, it is used to carry
Volumetric solution is flowed in calibration pipeline with certain pressure for power；Standard scale 4, along solution pump outbound course demarcation is installed on
On pipeline, it is used to provide reference data for the mass flow of volumetric solution in calibration pipeline；Multiple mass flowmenters 5 to be measured
Uniformly it is installed in the calibration pipeline along the outbound course of standard scale 4；Executor's switch 2, it is used to control calibration pipeline internal standard
Determine whether solution flows, be additionally operable to adjust mass flow of the volumetric solution within the unit interval in calibration pipeline；Computer 6, its
Respectively quality of connection effusion meter 5, standard scale 4, executor switchs 2 and electronic scale 7；It is used for the size adjustment according to reference data
The aperture of executor's switch 1, and mass flowmenter 5 to be measured is read according to the electronic scale 7；Electronic scale 7, it is connected to institute
Executor's switch 2 is stated, for the flow mass that the calibration pipeline of metered mass effusion meter 5 is overflowed.
In the present embodiment, by computer controlled automatic mass flowmenter 5, standard scale 4, executor switch 2 and electronics
Scale 7, whole calibration process has prevented the artificial factors of instability without the need for manually participating in, and not only increases the efficiency of demarcation, also carries
The high precision demarcated.
Specifically, executor's switch 2 includes the first executor switch, the second executor switch, and described first performs
Device switch 2 is installed between standard scale and solution pump in calibration pipeline, and it is used for the first control signal according to computer export
Whether volumetric solution flows in control calibration pipeline；The second executor switch 2 is installed on electronic scale and near its matter
On demarcation official road between amount effusion meter, it is used to be adjusted in calibration pipeline according to the second control signal of computer export demarcates
Mass flow of the solution within the unit interval.
On the basis of said structure, constant pressure and flow tank can be also provided between the solution pump 3 and executor's switch 2, it is described
The calibration pipeline of the output of the input connection solution pump 3 of constant pressure and flow tank, the outfan of the constant pressure and flow tank is by demarcating
Pipeline connection executor switch 2, the constant pressure and flow tank is used to eliminate in the trickle and volumetric solution in the volumetric solution
The air bubble of institute's band.
Specifically, each described mass flowmenter 5 is equipped with the fixed machine for supporting its work with the both sides of standard scale 4
Frame, i.e. standard scale both sides have fixed frame with mass flowmenter both sides, and the fixed frame is preferably cement support.It not only may be used
To eliminate impact of the vibration of calibration pipeline to the whole machine instrument of quality flow calibration, it is also possible to eliminate because of mass flow meter sensor
Impact of the itself s mechanical vibration to quality flow calibration.Meanwhile, the fixed frame is also for online overall mass flow to be calibrated
Play a part of isolation between meter, prevent influencing each other between overall mass effusion meter to be calibrated.
Specifically, the electronic scale 7 is connected with the draining control valve by the computer controls, the draining control valve with
Connected using bus marco between computer 6, switched according to the control signal control draining control valve that computer sends, such as：
During mass flowmeter calibration, draining control valve is closed all the time；Mass flowmenter has often been demarcated once, then open draining control
Till valve mass flow in the electronic scale is drained.
Specifically, the computer 6 connects respectively executor's switch 2, standard scale 4, mass flowmenter by controlling bus
5th, electronic scale 7 and draining control valve；Computer also can be replaced middle control machine, smart machine or terminal, and computer is by total line traffic control
Reference data in mode processed, and reading standard scale controls foundations as control executor switch 2, that is, adjust machine and control to adjust
The foundation of executor's switch aperture size depends primarily on the size of standard scale metering output instantaneous mass flow, standard scale metering
Output instantaneous mass flow is little, then the aperture of the second executor switch is little；Otherwise, standard scale metering output instantaneous mass flow
Greatly, then the aperture of the second executor switch is big, can improve the control accuracy of executor's switch.
And the number of the mass flowmenter 5 to be measured is up to five, relative to original calibration system at most only
Two mass flowmenters can be demarcated, improve demarcation efficiency.
As shown in figure 3, the example structure figure of the calibration system for a kind of mass flowmenter of the present invention, including：
In the present embodiment, volumetric solution of the volumetric solution device 1 for needed for solution pump 3 provides demarcation, solution pump 3
In the presence of constant pressure and flow tank, it is ensured that the calibration pipeline in whole calibration system is constant current constant voltage, can exclude demarcation molten
A large amount of impacts of the bubble to stated accuracy in liquid；The computer 6 connects respectively the first executor and opens by bus marco control
Pass, the second executor switch, the mass flowmenter 5 of standard scale 4, five (to be calibrated) to be measured, electronic scale 7 and draining control
Valve, they are connected each other by calibration pipeline, and the standard scale mass flowmenter to be measured with five presses from left to right suitable
Sequence is uniformly distributed in calibration pipeline respectively along the outbound course of constant pressure and flow tank, and there is the fixed machine of support calibration pipeline lower section
Frame (as above, here is not repeated one by one)；When demarcating every time, it is used as by the reference data of reading standard scale and controls the second executor
The foundation of switch aperture size；Flow and stop by volumetric solution in first executor's switch open of control and stopping calibration pipeline
The dynamic switch of fluid stopping；And computer demarcates every time the flow mass that recorded electronic claims to measure, according to corresponding in multiple point difference
Flow mass calculate the mass flow coefficient of each mass flowmenter, mass flow coefficient is preserved to corresponding quality stream
Gauge；Meanwhile, control draining control valve is opened so that the volumetric solution of electronic scale resets, to prepare to demarcate next time.
As shown in figure 4, a kind of scaling method flow chart of the mass flowmenter for the present invention, including：
Step 1, according to the type of mass flowmenter to be measured its aperture value and higher limit are arranged；
Step 2, adjusts the first executor switch and the second executor switch, until mass flowmenter No leakage to be measured is
Only；
Step 3, when the first executor switch with the second executor switch adjust to work to the last minute aperture when, keep the state extremely
Few ten minutes (till close bubble-free in the measurement pipe of calibration pipeline, standard scale and mass flowmenter)；
Step 4, when the first executor switch is adjusted to zero point aperture with the second executor switch, obtains standard scale and works as
The first front reading；Whether volumetric solution is flow regime in detection calibration pipeline, if the volumetric solution is the shape that do not flow
During state, then instruct to mass flowmenter broadcast transmission automatic zero adjustment to be measured, and adjust draining control valve and be closed, directly
To automatic zero adjustment is completed；
Step 5, according to the type and range of mass flowmenter to be measured the fixed point of mass flowmenter, the demarcation are chosen
Taken amount journey multiple point is clicked for selected point, wherein, the multiple point includes 1.0,0.9,0.8,0.7,0.6,0.5,0.4,0.3,
0.2nd, 0.1,0.05 and 0.02；
Step 6, demarcates by quality process fixed point of certain selected point, adjusts the first executor switch for aperture of working to the last minute,
Obtain the second current reading of standard scale；Mass flow is held adjusting second according to corresponding to second reading near selected point
The aperture of row device switch, till mass flowmenter to be measured reaches the corresponding quality process fixed point of the selected point；
Step 7, it is zero point aperture to adjust the first executor switch, keeps the aperture of the second executor switch constant (at least
Two minutes), till between calibration pipeline and electronic scale without volumetric solution drippage；
Step 8, removes the gross mass of standard scale and mass flowmenter output to be measured, and records the reading of Current electronic scale
Number is simultaneously reset；
Step 9, adjusts the first executor switch for aperture of working to the last minute, and time delay at preset timed intervals exists mass flowmenter to be measured
The corresponding multiple point of the selected point is that mass flow fixed point is demarcated；
Step 10, it is zero point aperture to adjust the first executor switch, obtains whether the current reading of standard scale is zero, if
When the current reading of the standard scale is to drip without volumetric solution between zero and calibration pipeline and electronic scale, obtains and record per platform
The gross mass of mass flowmenter output to be measured and the gross mass of electronic scale volumetric solution；
Step 11, repeat step 6 to 10, the quality process fixed point for being sequentially completed other selected points is demarcated；According to demarcation
Data calculate the mass flow coefficient of every mass flowmenter, and the mass flow coefficient is stored in into mass flow to be measured
Meter.
Step 12, the range multiple point that mass flowmenter is screened again is selected point, by step 6 to 11 to each selected point
Precision and repeatability detection are carried out, demarcation and the testing result of mass flowmenter to be measured is recorded.
Scaling method according to above-mentioned mass flowmenter launches, and details are as follows：
1. mass flowmenter mass flow calibration system in initializing computer, selects the mass flow demarcation of a new round,
And the type selecting of the mass flow meter sensor demarcated according to actual production arranges the mass flowmenter for treating that mass flow is demarcated
The upper limit that the size of bore and mass flow are demarcated；
2. control the first adjusting actuator switch and the second executor to switch to closed mode, i.e. aperture is 0；
3. detect whether constant pressure and flow tank is in canful pressure constant state, if being not in canful pressure constant state, open permanent
Air discharge cook on pressure constant current tank arrangement, makes the volumetric solution that solution pump is supplied close full of after constant pressure and flow tank to greatest extent
Air discharge cook, its objective is to eliminate the state that there is air bubble and the non-constant pressure and flow of volumetric solution in volumetric solution；
4. the whole machine instrument of mass flowmenter to be calibrated is arranged in calibration pipeline, the calibration system accommodates up to 5
Overall mass effusion meter, if less than 5, by the way of pipeline is directly connected to；
5. it is 50% point to control to adjust executor's switch 1 and executor's switch 2 to aperture, observes calibration pipeline and whole machine matter
The flange connections of amount effusion meter whether there is leakage phenomenon；If No leakage phenomenon, by mass flow calibration system software control
It is 100% point that system adjusts the first executor switch and the second executor and switchs to aperture, and calibration pipeline and whole machine matter are observed again
The flange connections of amount effusion meter whether there is leakage phenomenon；If still No leakage phenomenon, continuous firing 5 minutes or so, by matter
Amount flo w calibration system software controls to adjust the first executor switch and the second executor is switched to closed mode.Detection is being installed
During if there is leakage, then need human intervention to be reinstalled.
6. the mass flow for opening mass flow calibration system software demarcates flow process；
7. it is 100% point to control to adjust executor's switch 1 and executor's switch 2 to aperture so as to continued in this condition
Work 10 minutes, the process is to make volumetric solution fully full of calibration pipeline and standard scale, mass flow meter sensor to be calibrated
Measurement pipe in, eliminating the precision brought of bubble affects；
8. it is 0% point to control to adjust executor's switch 1 and executor's switch 2 to aperture, is then obtained by data/address bus
The real-time output state of standard scale, whether there is solution flow regime, if without solution flow process, quality stream in monitoring calibration pipeline
Amount calibration system software to online all mass flowmenters to be calibrated send broadcast automatic zero adjustment quality, while controlling draining control
Valve is closed, and waits school zero to complete；
9. according to the mass flow meter sensor type and range determination selection fixed point for treating that mass flow is demarcated, generally choosing
Select 1.0,0.9,0.8,0.7,0.6,0.5,0.4,0.3,0.2,0.1, the 0.05 of mass flowmenter mass flow range to be calibrated
With 0.02 point of selected point that the most mass flow is demarcated；
10. carry out the mass flow fixed point that mass flowmenter mass flow range to be calibrated is 1.0 times to demarcate.Quality stream
Amount calibration system software control and regulation executor's switch 1 to aperture is 100% point, obtains standard scale by data/address bus real-time
Mass flow output valve, and whether reach or be close to mass flowmenter quality stream to be calibrated according to actual mass flow output valve
Amount range is the aperture size that the mass flow of 1.0 times of points carrys out adjusting actuator switch 2 so as to which aperture meets quality stream to be calibrated
Gauge mass flow range is 1.0 times of mass flow fixed point；
11. control and regulation executor switches 1 are closed, and the aperture of executor's switch 2 is constant, time delay 2 minutes；Prolong
When purpose just wait between calibration pipeline terminal and electronic scale without volumetric solution drippage till；
12. gross masses for removing standard scale and mass flowmenter to be calibrated metering output, while recording and removing electronic scale
The gross mass value of metering output (records the gross mass of each electronic scale metering output, and the gross mass of each metering is carried out into phase
Plus, judge its cumulative total amount whether reach or it is close this claim measure ultimate value, if reaching or being close to, mass flow mark
Determine systems soft ware and control draining control valve in open state by controlling bus, the Dosing Solution of electronic-weighing is carried out into whole rows
Put, while the accumulation total amount in mass flow calibration system software is also carried out to reset).
The aperture state of 13. control and regulation executor switches 1 to 100%, carries out mass flowmenter mass flow to be calibrated
Range is that 1.0 times of mass flow fixed point is demarcated, the time delay gauging calibration of 6 minutes (delay time can set)；
The aperture state of 14. control and regulation executor switches 1 to 0%, by data/address bus the real-time matter of standard scale is obtained
Whether amount flow output valve is 0, if 0 and time delay wait between calibration pipeline terminal and electronic scale without volumetric solution drippage
When, mass flow calibration system software is obtained by data/address bus and recorded and correspond to online each mass flowmenter output metering
Gross mass and electronic scale gauging calibration solution gross mass；
15. repeat steps 10) -14), complete online mass flowmenter range 0.9 to be calibrated, 0.8,0.7,0.6,0.5,
0.4th, the demarcation of the mass flow of 0.3,0.2,0.1,0.05 and 0.02 times of point；
16. matter are calculated according to the data demarcated and correspond to online the mass flow coefficient of each mass flowmenter, and are passed through
Data/address bus is written to coefficient in the EEPROM of corresponding mass flowmenter transducer.
17. precision for automatically beginning to online mass flowmenter and repeatability detection；
18. are generally chosen at 1.0,0.75,0.50,0.25 and 0.1 times of point of line mass effusion meter range as quality stream
The precision of gauge and repeated test point；
19. carry out the mass flow calibrating point calibrating that mass flow is 1.0 times.The control of mass flow calibration system software is adjusted
Section executor's switch 1 to aperture is 100% point, by the real-time mass flow output valve of data/address bus acquisition standard scale, and according to
Factually whether mass flow output valve in border reaches or the close quality stream for treating that mass flowmenter mass flow range is 1.0 times of points
Amount carrys out the aperture size of adjusting actuator switch 2 so as to which aperture meets the quality that mass flowmenter mass flow range is 1.0 times
Flow point；
20. control and regulation executor switches 1 are closed, and the aperture of executor's switch 2 is constant, time delay 2 minutes；Prolong
When purpose just wait between calibration pipeline terminal and electronic scale without volumetric solution drippage till；
21. gross masses for removing standard scale and mass flowmenter to be calibrated metering output, while recording and removing electronic scale
The gross mass value of metering output.
The aperture state of 22. control and regulation executor switches 1 to 100%, carrying out mass flowmenter mass flow range is
1.0 times of mass flow point precision and repeatability detection, the time delay measurement verification of 6 minutes；
The aperture state of 23. control and regulation executor switches 1 to 0%, by data/address bus the real-time matter of standard scale is obtained
Whether amount flow output valve is 0, if 0 and time delay wait between calibration pipeline terminal and electronic scale without volumetric solution drippage
When, mass flow calibration system software is obtained by data/address bus and recorded and correspond to online each mass flowmenter output metering
Gross mass and electronic scale gauging calibration solution gross mass；
24. repeat steps 21) -23), difficulty action accomplishment flow is the 2nd precision and weight of 1.0 times of mass flow calibrating point
The detection of renaturation；
25. repeat steps 21) -23), difficulty action accomplishment flow is the 3rd precision and weight of 1.0 times of mass flow calibrating point
The detection of renaturation；
26. repeat steps 19) -25), precision and the repeatability of 0.75,0.50,0.25 and 0.1 times of point of difficulty action accomplishment flow
Detection；
The demarcation of the online mass flowmenter of 27. report production users and testing result (precision and repeatability).
In sum, the demarcation by the way that original manually-operated calibration system to be replaced with computer controlled automatic of the invention
System, adopts computer to send the aperture of control signal adjusting actuator switch to reach volumetric solution in control calibration pipeline
Two mass flowmenters at most can only be demarcated by flow velocity in original calibration system, and can simultaneously demarcate five now, condition
And the efficiency of the demarcation of mass flowmenter is not only increased completely without the need for artificially participating in calibration process, also it is greatly improved
Mass flowmeter calibration precision；Meanwhile, constant pressure and flow tank is introduced in calibration system, eliminate because of solution pump operationally institute
The volumetric solution trickle of product and the problem of air bubble, inherently improve the stated accuracy of mass flowmenter.So, this
It is bright effectively to overcome various shortcoming of the prior art and have high industrial utilization.
The principle and its effect of above-described embodiment only illustrative present invention, it is of the invention not for limiting.It is any ripe
Know the personage of this technology all can carry out modifications and changes under the spirit and the scope without prejudice to the present invention to above-described embodiment.Cause
This, such as those of ordinary skill in the art is complete with institute under technological thought without departing from disclosed spirit
Into all equivalent modifications or change, should by the present invention claim be covered.
Claims (10)
1. the quality demarcation system of a kind of mass flowmenter, it is characterised in that include：
Volumetric solution device, it is used to provide the volumetric solution needed for mass flowmeter calibration；
Solution pump, it is used to providing power volumetric solution is flowed in calibration pipeline with certain pressure；
Standard scale, is installed in calibration pipeline along solution pump outbound course, and it is used for as the quality of volumetric solution in calibration pipeline
Flowing provides reference data；
Multiple mass flowmenters to be measured are uniformly installed in the calibration pipeline along standard scale outbound course；
Executor switchs, and it is used to control whether volumetric solution in calibration pipeline flows, and is additionally operable to adjust in calibration pipeline and demarcates
Mass flow of the solution within the unit interval；
Computer, its difference quality of connection effusion meter, standard scale, executor's switch and electronic scale；It is used for according to reference data
Size adjustment executor switch aperture, and mass flowmenter to be measured is read according to the electronic scale；Electronic scale, its company
Executor's switch is connected to, for the flow mass that metered mass flow meter calibration pipeline overflows.
2. the quality demarcation system of mass flowmenter according to claim 1, it is characterised in that executor's switch bag
The first executor switch, the second executor switch are included, the first executor switch is installed between standard scale and solution pump to be marked
On fixed tube road, it is used to control whether volumetric solution in calibration pipeline flows according to the first control signal of computer export；Institute
State the second executor switch to be installed on electronic scale and the demarcation official road between its mass flowmenter, it is used for basis
Second control signal of computer export adjusts mass flow of the volumetric solution within the unit interval in calibration pipeline.
3. the quality demarcation system of mass flowmenter according to claim 1 and 2, it is characterised in that the solution pump with
Constant pressure and flow tank is provided between executor's switch, it is used to eliminate institute's band in the trickle and volumetric solution in the volumetric solution
Air bubble.
4. the quality demarcation system of mass flowmenter according to claim 1 and 2, it is characterised in that each described quality
Effusion meter is equipped with the fixed frame for supporting its work with the both sides of standard scale.
5. the quality demarcation system of mass flowmenter according to claim 1 and 2, it is characterised in that the computer leads to
Cross controlling bus and connect executor's switch, standard scale, mass flowmenter and electronic scale respectively.
6. the quality demarcation system of mass flowmenter according to claim 1, it is characterised in that the electronic scale is connected with
By the draining control valve of the computer controls.
7. the quality demarcation system of mass flowmenter according to claim 6, it is characterised in that the computer and draining
It is controlling bus connection between control valve.
8. the quality demarcation system of mass flowmenter according to claim 1 and 2, it is characterised in that the institute to be measured
The number for stating mass flowmenter is up to five.
9. the method for the quality demarcation system of the mass flowmenter described in a kind of any one of employing the claims 1 to 9, its
It is characterised by, including：
Step 1, according to the type of mass flowmenter to be measured its aperture value and higher limit are arranged；
Step 2, adjusts the first executor switch and the second executor switch, till mass flowmenter No leakage to be measured；
Step 3, when the first executor switch with the second executor switch adjust to work to the last minute aperture when, until calibration pipeline, mark
In the measurement pipe of quasi- table and mass flowmenter till close bubble-free；
Step 4, when the first executor switch is adjusted to zero point aperture with the second executor switch, obtains standard scale current
First reading；Whether volumetric solution is flow regime in detection calibration pipeline, if the volumetric solution is non-flow regime,
Then instruct to mass flowmenter broadcast transmission automatic zero adjustment to be measured, and adjust draining control valve and be closed, until certainly
Till dynamic school zero completes；
Step 5, according to the type and range of mass flowmenter to be measured the fixed point of mass flowmenter is chosen, and the demarcation is clicked
Taken amount journey multiple point be selected point, wherein, the multiple point include 1.0,0.9,0.8,0.7,0.6,0.5,0.4,0.3,0.2,
0.1st, 0.05 and 0.02；
Step 6, demarcates by quality process fixed point of certain selected point, adjusts the first executor switch for aperture of working to the last minute, and obtains
The second current reading of standard scale；Mass flow is adjusting the second executor according to corresponding to second reading near selected point
The aperture of switch, till mass flowmenter to be measured reaches the corresponding quality process fixed point of the selected point；
Step 7, it is zero point aperture to adjust the first executor switch, keeps the aperture of the second executor switch constant, until demarcating
Till dripping without volumetric solution between pipeline and electronic scale；
Step 8, removes the gross mass of standard scale and mass flowmenter output to be measured, and records the reading of Current electronic scale simultaneously
Reset；
Step 9, adjusts the first executor switch to work to the last minute aperture, at preset timed intervals time delay by mass flowmenter to be measured described
The corresponding multiple point of selected point is the demarcation of mass flow fixed point；
Step 10, it is zero point aperture to adjust the first executor switch, obtains whether the current reading of standard scale is zero, if described
When the current reading of standard scale is to drip without volumetric solution between zero and calibration pipeline and electronic scale, obtains and record and be to be measured per platform
Mass flowmenter output gross mass and electronic scale volumetric solution gross mass；
Step 11, repeat step 6 to 10, the quality process fixed point for being sequentially completed other selected points is demarcated；According to nominal data
The mass flow coefficient of every mass flowmenter is calculated, and the mass flow coefficient is stored in into mass flowmenter to be measured；
Step 12, the range multiple point that mass flowmenter is screened again is selected point, and each selected point is carried out by step 6 to 11
Precision and repeatability detection, record demarcation and the testing result of mass flowmenter to be measured.
10. the quality demarcation method of mass flowmenter according to claim 9, it is characterised in that the step.
Whether detection constant pressure and flow tank is in canful pressure constant state, if it is not in canful pressure constant state, opens its aerofluxus and opens
Close, till constant pressure and flow tank is changed into canful constant pressure by solution pump.
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