CN106679770B - Mass calibration system and method for mass flowmeter - Google Patents
Mass calibration system and method for mass flowmeter Download PDFInfo
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- CN106679770B CN106679770B CN201611039840.4A CN201611039840A CN106679770B CN 106679770 B CN106679770 B CN 106679770B CN 201611039840 A CN201611039840 A CN 201611039840A CN 106679770 B CN106679770 B CN 106679770B
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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 a mass calibration method of a mass flowmeter, wherein the system comprises the following components: a calibration solution device for providing a solution required for mass flowmeter calibration; a solution pump for flowing a calibration solution within the calibration tubing; a plurality of mass flowmeters to be measured are uniformly arranged on the calibration pipeline; the actuator switch is used for adjusting the flow speed of the calibration solution in the calibration pipeline and adjusting the mass flow rate in the unit time in the calibration pipeline; a standard table for providing reference data for mass flow of the calibration solution within the calibration conduit; the computer is respectively connected with the mass flowmeter to be measured, the standard meter, the actuator switch and the electronic scale; the electronic balance is used for generating a control signal to adjust an actuator switch according to the reference data and reading the mass flow of the mass flowmeter to be measured and the mass flow of the standard meter according to the electronic balance; and the electronic scale is used for measuring the overflow flow mass of the measuring tube of the mass flowmeter. The invention improves the mass calibration precision and efficiency of the mass flowmeter.
Description
Technical Field
The invention belongs to the technical field of instrument correction, and particularly relates to a mass calibration system and a mass calibration method of a mass flowmeter.
Background
The coriolis mass flowmeter is a kind of instrument which is developed and designed by applying the fluid mechanics principle, and is mainly used for measuring the mass flow rate and density of gas and liquid, and the volume flow rate, total mass, total volume and other parameters which are derived from the mass flow rate and the density and are required by engineering. In the present stage, the coriolis mass flowmeter can be used for various conventional fluids, various unconventional fluids, slurry, liquefied gases and compressed natural gases, is widely applied to industries such as petrochemical industry, papermaking industry, food industry, pharmacy industry and the like, and has a metering accuracy of between 0.1 and 0.5 percent. Therefore, for manufacturers of coriolis force mass flowmeters, not only are the processes of designing, producing, processing and the like of the coriolis force mass flowmeter sensor continuously improved, but also the calibration system of the coriolis force mass flowmeter complete machine meter is scientifically and reasonably improved and improved. Any production link of the whole coriolis force mass flowmeter product comprises selection and welding of a converter device, machining of a sensor shunt, shaping and welding of a measuring tube, design of a calibration system pipeline, selection of calibration equipment and the like, and the linearity, stability, repeatability, precision, temperature drift and the like of the final whole coriolis force mass flowmeter are related; so the coriolis mass flowmeter product and its detection calibration system are verified for accuracy and practicality problems, then the two are separated for verification. If the related parameters such as precision, repeatability, stability and the like of the Coriolis force mass flowmeter are to be checked, a set of detection calibration system conforming to national standards is needed; in contrast, if the related parameters such as precision, repeatability, stability and the like of the coriolis force mass flowmeter calibration system are to be detected, the device for calibrating and measuring the coriolis force mass flowmeter should be provided and satisfied, and the overall design error of the whole calibration system is far lower than the practical application precision of the coriolis force mass flowmeter. Therefore, a reasonable and scientific automatic instrument and meter and a calibration system thereof can be designed.
FIG. 1 is a schematic diagram of a calibration system of a conventional Coriolis mass flowmeter, wherein a calibration solution device is a device for containing a calibration medium solution; the solution pump provides source power for the calibration medium solution, so that the calibration medium solution can flow stably in the calibration pipeline; a flow direction switch for controlling the flow of the calibration medium solution in the calibration pipeline; a calibration pipe, a passage through which a calibration medium solution flows; the mass flowmeter is a Coriolis force mass flowmeter; a fixed pedestal for fixedly clamping a cement pile of the coriolis force mass flowmeter to be calibrated; the flow control switch adjusts the opening degree by manual adjustment, and aims to adjust the mass flow of the medium solution in the calibration pipeline; an electronic scale for measuring the mass of the medium solution passing through the mass flow measuring tube; a drain switch, a manual switch for discharging medium solution in the electronic scale.
The calibration method flow of the calibration system in fig. 1 is described in detail as follows:
step 1, closing a flow direction switch, installing a mass flowmeter to be calibrated on a calibration pipeline according to the diagram shown in fig. 1, enabling the calibration pipeline and a mass flowmeter installation flange to be in a sealing state, avoiding leakage, and simultaneously ensuring that a mass flowmeter shell is vertical to the ground;
step 2, starting a solution pump, adjusting a flow direction switch, a flow quantity control switch and an electronic scale drainage switch to the maximum opening, enabling a calibration medium solution to flow in a calibration pipe at the maximum flow speed, and maintaining the state for at least 20 minutes, wherein the purpose is to enable the calibration medium solution to fill the whole calibration pipe and remove air in the pipe;
step 3, closing a flow direction switch and a flow quantity control switch, and setting a mass flowmeter converter to be calibrated on a calibration pipeline to be in an automatic zero calibration state until the automatic zero calibration is completed;
step 4, adjusting a flow control switch to a full-opening state, and recording the maximum phase difference corresponding to a sensor measuring tube when the current mass flowmeter sensor to be calibrated is at the maximum flow when the flow of the calibration solution is stable;
step 5, selecting flow calibration points of the mass flowmeter to be calibrated by taking the maximum phase difference corresponding to the sensor measurement tube at the maximum flow as a reference, wherein the flow calibration points are 1.0, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1, 0.05 and 0.02 times of the maximum phase difference generated by the sensor measurement tube at the maximum flow;
step 6, adjusting the opening degree of the flow control switch to ensure that the opening degree of the flow control switch meets the flow of the calibration solution in the calibration pipeline, so that the measuring pipe of the mass flowmeter sensor generates a point 1.0 times of the maximum phase difference, and closing the flow direction switch of the front section of the calibration pipeline until no calibration solution drops at the electronic scale end of the calibration pipeline;
step 7, a flow direction switch at the front section of the calibration pipeline is turned on, when the maximum phase difference corresponding to the measuring pipe of the sensor is 1.0 time point when the sensor of the calibration mass flowmeter is at the maximum flow rate, the calibration measurement is delayed for 7-10 minutes, the flow direction switch is turned off until no calibration solution drops at the electronic scale end of the calibration pipeline, and the total measurement mass and the total measurement amount of the electronic scale on all current mass flowmeter converters to be calibrated are sequentially recorded;
step 8, repeating the steps 6 to 7 to finish the calibration of other phase difference calibration points;
and 9, calculating a mass flow coefficient corresponding to each mass flowmeter to be calibrated according to the calibration data, and writing the coefficient into an EEPROM of the mass flowmeter converter in a key operation mode.
And step 10, detecting the accuracy and repeatability of the mass flowmeter.
Step 11, adjusting a flow control switch to a full-opening state, and recording the maximum mass flow output by a mass flowmeter converter on the current calibration pipeline;
step 12, taking the maximum mass flow as a reference, and respectively selecting points 1.0, 0.75, 0.50, 0.25 and 0.1 times of the maximum mass flow as precision detection and repeatability detection points of the mass flowmeter;
step 13, adjusting a flow control switch to a point 1.0 times of the maximum mass flow output by the mass flowmeter converter, delaying measurement for 7-10 minutes, closing a flow direction switch until no solution drops at the electronic scale end of the calibration pipeline, and sequentially recording the total mass output by the mass flowmeter converter to be calibrated and the total mass measured by the electronic scale;
step 14, repeatedly metering 3 times at a point 1.0 times of the maximum mass flow, and calculating the accuracy and repeatability of the current detection point;
and 15, repeating the steps 13 to 14 to finish the detection of other mass flow detection points.
In the existing mass flow calibration system of the Coriolis mass flowmeter, mass flow calibration of 2 mass flowmeters is contained at most, in the whole calibration process, the adjustment of the calibration flow is included, data recording is carried out in the calibration process, corresponding coefficients are calculated, and accuracy and repeatability detection are manually operated as required when the calibration is completed, so that the accuracy and repeatability of the whole instrument are affected by manual operation. In addition, a large number of experiments and tests show that in the process of producing and calibrating the solution pump and the calibration pipeline in the calibration system, a certain amount of air bubbles are always brought into the calibration pipeline, and the calibration solution in the calibration pipeline can be trickled due to the operation of the solution pump, so that the precision of the mass flow calibration system of the whole mass flowmeter is greatly reduced due to the factors.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a mass calibration system and method for a mass flowmeter, which are used for solving the problems of low efficiency and low accuracy of the whole mass flowmeter calibration caused by manual operation required in the mass flowmeter calibration in the prior art.
To achieve the above and other related objects, the present invention provides a mass calibration system of a mass flowmeter, comprising:
a calibration solution device for providing a calibration solution required for calibration of the mass flowmeter; a solution pump for providing power to flow the calibration solution at a pressure within the calibration tubing; the standard meter is arranged on the calibration pipeline along the output direction of the solution pump and is used for providing reference data for the mass flow of the calibration solution in the calibration pipeline; a plurality of mass flowmeters to be measured are uniformly arranged on the calibration pipeline along the output direction of the standard meter; the actuator switch is used for controlling whether the calibration solution in the calibration pipeline flows or not and also used for adjusting the mass flow rate of the calibration solution in the calibration pipeline in unit time; the computer is respectively connected with the mass flowmeter, the standard meter, the actuator switch and the electronic scale; the electronic scale is used for adjusting the opening of the actuator switch according to the size of the reference data and reading the mass flowmeter to be measured according to the electronic scale; and the electronic scale is connected with the actuator switch and is used for measuring the flow quality of the overflow of the calibration pipeline of the mass flowmeter.
Preferably, the actuator switch comprises a first actuator switch and a second actuator switch, wherein the first actuator switch is arranged on a calibration pipeline between the standard meter and the solution pump and is used for controlling whether the calibration solution in the calibration pipeline flows or not according to a first control signal output by a computer; the second actuator switch is arranged on a calibration functional channel between the electronic scale and the mass flowmeter close to the electronic scale and is used for adjusting the mass flow of the calibration solution in the calibration pipeline in unit time according to a second control signal output by the computer.
Preferably, a constant pressure and constant flow tank is arranged between the solution pump and the actuator switch and is used for eliminating trickle flow in the calibration solution and air bubbles carried in the calibration solution.
Preferably, both sides of each mass flowmeter and the standard meter are provided with a fixed frame for supporting the mass flowmeter and the standard meter to work.
Preferably, the electronic scale is connected with a drainage control valve controlled by the computer.
Preferably, the computer is respectively connected with the actuator switch, the standard meter, the mass flowmeter, the electronic scale and the drainage control valve through the control bus.
Preferably, the number of the mass flow meters to be measured is at most five.
The invention also aims to provide a mass calibration method of the mass flowmeter, which comprises the following steps:
step 1, setting an aperture value and an upper limit value according to the type of a mass flowmeter to be tested;
step 2, adjusting the first actuator switch and the second actuator switch until the mass flowmeter to be tested has no leakage;
step 3, when the first actuator switch and the second actuator switch are adjusted to the full-point opening degree, until no bubbles are near in the measuring tubes of the calibration pipeline, the standard meter and the mass flowmeter;
step 4, when the first actuator switch and the second actuator switch are both adjusted to the zero opening, acquiring the current first reading of the standard table; detecting whether the calibration solution in the calibration pipeline is in a flowing state, if the calibration solution is in a non-flowing state, broadcasting and sending an automatic zero calibration instruction to a mass flowmeter to be tested, and adjusting the drainage control valve to be in a closed state until the automatic zero calibration is completed;
step 5, selecting a calibration point of the mass flowmeter according to the type and the measuring range of the mass flowmeter to be measured, wherein the calibration point selects a measuring range multiple point as a selection point, and the multiple point comprises 1.0, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1, 0.05 and 0.02;
step 6, calibrating by taking a certain selected point as a quality flow calibration point, adjusting a first actuator switch to be a full-point opening degree, and obtaining a current second reading of the standard table; adjusting the opening of a second actuator switch according to the mass flow rate corresponding to the second reading approaching the selected point until the mass flow meter to be measured reaches a mass flow calibration point corresponding to the selected point;
step 7, adjusting the first actuator switch to be a zero opening degree, and keeping the opening degree of the second actuator switch unchanged until no calibration solution drops between the calibration pipeline and the electronic scale;
step 8, clearing the total mass output by the standard meter and the mass flowmeter to be tested, recording the reading of the current electronic scale and resetting the reading;
step 9, adjusting the first actuator switch to be the full-point opening, and calibrating the mass flowmeter to be measured at a multiple point corresponding to the selected point as a mass flow calibration point according to the preset time delay;
step 10, adjusting a first actuator switch to be a zero opening degree, acquiring whether the current reading of a standard meter is zero, and acquiring and recording the total mass output by each mass flowmeter to be tested and the total mass of the calibration solution of the electronic scale if the current reading of the standard meter is zero and no calibration solution drops between the calibration pipeline and the electronic scale;
step 11, repeating the steps 6 to 10, and sequentially completing the calibration of the quality flow calibration points of other selected points; calculating a mass flow coefficient of each mass flowmeter according to the calibration data, and storing the mass flow coefficient in the mass flowmeter to be measured;
and 12, rescreening the measuring range multiple points of the mass flowmeter as selected points, detecting the precision and repeatability of each selected point according to steps 6 to 11, and recording the calibration and detection results of the mass flowmeter to be detected.
Further, before the step 2, the method further includes:
detecting whether the constant-pressure constant-flow tank is in a full-tank constant-pressure state, and if the constant-pressure constant-flow tank is not in the full-tank constant-pressure state, starting an exhaust switch until the solution pump changes the constant-pressure constant-flow tank into the full-tank constant-pressure state.
As described above, the calibration system and method of the mass flowmeter of the invention have the following beneficial effects:
the original manually operated calibration system is replaced by the computer automatically controlled calibration system, and the computer is used for sending a control signal to adjust the opening of the actuator switch so as to control the flow rate of the calibration solution in the calibration pipeline, so that at most two mass flowmeters can be calibrated in the original calibration system, five mass flowmeters can be calibrated at the same time, no human participation is required in the calibration process, the calibration efficiency of the mass flowmeters is improved, and the calibration precision of the mass flowmeters is greatly improved; meanwhile, a constant-pressure constant-flow tank is introduced into the calibration system, so that the problems of trickle flow and air bubbles of the calibration solution generated during the working of the solution pump are solved, and the calibration precision of the mass flowmeter is essentially improved.
Drawings
FIG. 1 is a schematic diagram of a calibration system of a coriolis mass flowmeter according to the present invention;
FIG. 2 is a block diagram of a calibration system for a mass flow meter according to the present invention;
FIG. 3 is a block diagram of an embodiment of a calibration system for a mass flow meter according to the present invention;
fig. 4 is a flow chart of a method for calibrating a mass flowmeter according to the present invention.
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
Please refer to fig. 2 to fig. 4. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the invention, are not intended to be critical to the essential characteristics of the invention, but are intended to fall within the spirit and scope of the invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
Referring to fig. 2, the present invention provides a calibration system structure block diagram of a mass flowmeter, including:
a calibration solution device 1 for providing a calibration solution required for mass flowmeter calibration; a solution pump 3 for providing power to flow the calibration solution at a pressure within the calibration tubing; a standard table 4, which is installed on the calibration pipeline along the output direction of the solution pump and is used for providing reference data for the mass flow of the calibration solution in the calibration pipeline; a plurality of mass flowmeters 5 to be measured are uniformly arranged on the calibration pipeline along the output direction of the standard table 4; an actuator switch 2 for controlling whether the calibration solution in the calibration pipe flows or not, and for adjusting the mass flow rate of the calibration solution in the calibration pipe per unit time; a computer 6 connected to the mass flowmeter 5, the standard table 4, the actuator switch 2, and the electronic scale 7, respectively; the electronic balance 7 is used for adjusting the opening of the actuator switch 1 according to the size of the reference data and reading the mass flowmeter 5 to be measured according to the electronic balance 7; an electronic scale 7, which is connected to the actuator switch 2, for calibrating the flow mass of the pipe overflow by the meter mass flow 5.
In the embodiment, the mass flowmeter 5, the standard table 4, the actuator switch 2 and the electronic scale 7 are automatically controlled by a computer, so that manual participation is not needed in the whole calibration process, the factors of manual instability are eliminated, the calibration efficiency is improved, and the calibration precision is also improved.
Specifically, the actuator switch 2 comprises a first actuator switch and a second actuator switch, the first actuator switch 2 is arranged on a calibration pipeline between the standard meter and the solution pump, and is used for controlling whether the calibration solution in the calibration pipeline flows or not according to a first control signal output by a computer; the second actuator switch 2 is arranged on a calibration functional channel between the electronic scale and the mass flowmeter close to the electronic scale and is used for adjusting the mass flow rate of the calibration solution in the calibration pipeline in unit time according to a second control signal output by the computer.
On the basis of the structure, a constant-pressure constant-flow tank can be further arranged between the solution pump 3 and the actuator switch 2, the input end of the constant-pressure constant-flow tank is connected with a calibration pipeline for outputting the solution pump 3, the output end of the constant-pressure constant-flow tank is connected with the actuator switch 2 through the calibration pipeline, and the constant-pressure constant-flow tank is used for eliminating trickle in the calibration solution and air bubbles carried in the calibration solution.
Specifically, both sides of each mass flowmeter 5 and the standard meter 4 are provided with a fixed frame for supporting the mass flowmeter to work, namely both sides of the standard meter and both sides of the mass flowmeter are provided with fixed frames, and the fixed frames are preferably cement brackets. The method can eliminate the influence of vibration of the calibration pipeline on the mass flow calibration instrument of the whole mass flow calibration machine and the influence of mechanical vibration of the mass flow meter sensor on the mass flow calibration. Meanwhile, the fixed frame also plays a role in isolating the mass flowmeter of the whole machine to be calibrated on line, and prevents the mutual influence of the mass flowmeter of the whole machine to be calibrated.
Specifically, the electronic scale 7 is connected with a drain control valve controlled by the computer, and the drain control valve is connected with the computer 6 by bus control, and controls the drain control valve to switch according to a control signal sent by the computer, for example: in the calibration process of the mass flowmeter, the drainage control valve is always closed; and (3) starting the drainage control valve until the mass flow in the electronic scale is exhausted after the mass flow meter is calibrated once.
Specifically, the computer 6 is respectively connected with the actuator switch 2, the standard table 4, the mass flowmeter 5, the electronic scale 7 and the drainage control valve through control buses; the computer can also be replaced by a central control computer, intelligent equipment or a terminal, the computer uses a bus control mode and reads reference data in a standard meter as a control basis for controlling the actuator switch 2, namely, the basis for controlling and adjusting the opening of the actuator switch by the regulator mainly depends on the measurement of the output instantaneous mass flow of the standard meter, and the opening of the second actuator switch is small when the measurement of the output instantaneous mass flow of the standard meter is small; otherwise, the standard meter measures and outputs the instantaneous mass flow to be large, the opening degree of the second actuator switch is large, and the control precision of the actuator switch can be improved.
And the number of the mass flowmeters 5 to be measured is five at most, and compared with the original calibration system, the two mass flowmeters can be calibrated at most, so that the calibration efficiency is improved.
As shown in fig. 3, an embodiment of a calibration system of a mass flowmeter according to the present invention comprises:
in this embodiment, the calibration solution device 1 provides the solution pump 3 with the calibration solution required by calibration, and the solution pump 3 ensures that the calibration pipelines in the whole calibration system are constant current and constant pressure under the action of the constant-pressure constant-flow tank, so that the influence of a large number of bubbles in the calibration solution on the calibration precision can be eliminated; the computer 6 is respectively connected with the first actuator switch, the second actuator switch, the standard meter 4, five mass flowmeters 5 to be measured (to be calibrated), the electronic scale 7 and the drainage control valve through bus control, and are connected with each other through calibration pipelines, the standard meter and the five mass flowmeters to be measured are respectively and uniformly distributed on the calibration pipelines along the output direction of the constant-pressure constant-current tank in the order from left to right, and a supporting fixed rack is arranged below the calibration pipelines (as above, which is not described in detail herein); when each time of calibration is carried out, the reference data of the standard table is read to be used as a basis for controlling the opening of the second actuator; the switch for starting and stopping the flow of the calibration solution in the calibration pipeline and stopping the flow is controlled by controlling the switch of the first actuator; the computer calibrates and records the flow mass measured by the electronic scale each time, calculates the mass flow coefficient of each mass flowmeter according to the flow mass corresponding to different times of points, and stores the mass flow coefficient to the corresponding mass flowmeter; and meanwhile, the drainage control valve is controlled to be opened, so that the calibration solution of the electronic scale is cleared to be ready for the next calibration.
As shown in fig. 4, a flow chart of a calibration method of a mass flowmeter according to the present invention includes:
step 1, setting an aperture value and an upper limit value according to the type of a mass flowmeter to be tested;
step 2, adjusting the first actuator switch and the second actuator switch until the mass flowmeter to be tested has no leakage;
step 3, when the first actuator switch and the second actuator switch are both adjusted to the full-point opening, maintaining the state for at least ten minutes (until no bubbles are near in the measuring tubes of the calibration pipeline, the standard meter and the mass flowmeter);
step 4, when the first actuator switch and the second actuator switch are both adjusted to the zero opening, acquiring the current first reading of the standard table; detecting whether the calibration solution in the calibration pipeline is in a flowing state, if the calibration solution is in a non-flowing state, broadcasting and sending an automatic zero calibration instruction to a mass flowmeter to be tested, and adjusting the drainage control valve to be in a closed state until the automatic zero calibration is completed;
step 5, selecting a calibration point of the mass flowmeter according to the type and the measuring range of the mass flowmeter to be measured, wherein the calibration point selects a measuring range multiple point as a selection point, and the multiple point comprises 1.0, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1, 0.05 and 0.02;
step 6, calibrating by taking a certain selected point as a quality flow calibration point, adjusting a first actuator switch to be a full-point opening degree, and obtaining a current second reading of the standard table; adjusting the opening of a second actuator switch according to the mass flow rate corresponding to the second reading approaching the selected point until the mass flow meter to be measured reaches a mass flow calibration point corresponding to the selected point;
step 7, adjusting the first actuator switch to be a zero opening, and keeping the opening of the second actuator switch unchanged (at least two minutes) until no calibration solution drops between the calibration pipeline and the electronic scale;
step 8, clearing the total mass output by the standard meter and the mass flowmeter to be tested, recording the reading of the current electronic scale and resetting the reading;
step 9, adjusting the first actuator switch to be the full-point opening, and calibrating the mass flowmeter to be measured at a multiple point corresponding to the selected point as a mass flow calibration point according to the preset time delay;
step 10, adjusting a first actuator switch to be a zero opening degree, acquiring whether the current reading of a standard meter is zero, and acquiring and recording the total mass output by each mass flowmeter to be tested and the total mass of the calibration solution of the electronic scale if the current reading of the standard meter is zero and no calibration solution drops between the calibration pipeline and the electronic scale;
step 11, repeating the steps 6 to 10, and sequentially completing the calibration of the quality flow calibration points of other selected points; and calculating the mass flow coefficient of each mass flowmeter according to the calibration data, and storing the mass flow coefficient in the mass flowmeter to be measured.
And 12, rescreening the measuring range multiple points of the mass flowmeter as selected points, detecting the precision and repeatability of each selected point according to steps 6 to 11, and recording the calibration and detection results of the mass flowmeter to be detected.
The mass flowmeter calibration method is developed according to the mass flowmeter calibration method, and is described in detail as follows:
1. initializing a mass flow calibration system of the mass flowmeter in the computer, selecting a new round of mass flow calibration, and selecting and setting the size of the caliber of the mass flowmeter to be subjected to mass flow calibration and the upper limit of mass flow calibration according to the type of a mass flow meter sensor for actual production calibration;
2. controlling the first and second actuator switches to be in a closed state, namely, the opening degree is 0;
3. detecting whether the constant-pressure constant-flow tank is in a full-tank constant-pressure state, if not, opening an exhaust switch on the constant-pressure constant-flow tank device to enable the calibration solution supplied by the solution pump to be fully filled in the constant-pressure constant-flow tank to the maximum extent, and closing the exhaust switch to eliminate the air bubbles in the calibration solution and the non-constant-pressure constant-flow state of the calibration solution;
4. the method comprises the steps that a whole instrument of the mass flowmeter to be calibrated is arranged on a calibration pipeline, the calibration system accommodates at most 5 whole mass flowmeters, and if the number of the mass flowmeters is less than 5, a pipeline direct connection mode is adopted;
5. controlling and adjusting the actuator switch 1 and the actuator switch 2 to 50% of opening, and observing whether the flange joint of the calibration pipeline and the whole machine mass flowmeter has leakage or not; if no leakage phenomenon exists, controlling and adjusting the first actuator switch and the second actuator switch to 100% of opening through mass flow calibration system software, and observing whether the leakage phenomenon exists at the flange connection part of the calibration pipeline and the whole mass flowmeter or not again; and if the leakage phenomenon still exists, the operation is continued for about 5 minutes, and the first actuator switch and the second actuator switch are controlled and regulated to be in a closed state through the mass flow calibration system software. If leakage occurs in the installation and detection process, the installation is reinstalled by human intervention.
6. Starting a mass flow calibration flow of mass flow calibration system software;
7. the actuator switch 1 and the actuator switch 2 are controlled and regulated to the point that the opening is 100%, so that the actuator switch and the actuator switch continuously work for 10 minutes in the state, and the process is that the calibration solution is fully filled in a calibration pipeline, a standard meter and a measuring tube of a mass flowmeter sensor to be calibrated, so that the influence of precision caused by bubbles is eliminated;
8. controlling and adjusting the actuator switch 1 and the actuator switch 2 to the point that the opening is 0%, then acquiring a real-time output state of a standard meter through a data bus, monitoring whether a solution flowing state exists in a calibration pipeline, if no solution flow exists, sending broadcast automatic zero calibration quality to all online mass flowmeters to be calibrated by mass flow calibration system software, simultaneously controlling a drainage control valve to be in a closed state, and waiting for zero calibration to be completed;
9. the method comprises the steps of determining a selection calibration point according to the type and the measuring range of a sensor of a mass flowmeter to be calibrated, and generally selecting 1.0, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1, 0.05 and 0.02 points of the mass flowmeter to be calibrated as selection points of mass flow calibration;
10. and (5) calibrating the mass flow calibration point of which the mass flow range of the mass flow meter to be calibrated is 1.0 times. The software of the mass flow calibration system controls and adjusts the opening of the actuator switch 1 to a point with the opening of 100%, acquires a real-time mass flow output value of the standard meter through a data bus, and adjusts the opening of the actuator switch 2 according to whether the actual mass flow output value reaches or approaches to a mass flow of which the mass flow range of the mass flow meter to be calibrated is 1.0 times, so that the opening of the actuator switch meets the mass flow calibration point with the mass flow range of the mass flow meter to be calibrated being 1.0 times;
11. the actuator switch 1 is controlled to be in a closed state, the opening of the actuator switch 2 is unchanged, and the time is delayed for 2 minutes; the purpose of the time delay is to wait until no calibration solution drops between the calibration pipeline terminal and the electronic scale;
12. and (3) clearing the total mass of the standard meter and the mass flowmeter to be calibrated in metering output, recording and clearing the total mass value of the electronic scale in metering output (recording the total mass of the electronic scale in metering output each time, adding the total mass of the electronic scale in metering output each time, judging whether the total accumulated total mass of the electronic scale reaches or approaches the limit value of the scale in metering, and if the total accumulated total mass of the electronic scale in metering output each time is reached or approaches, controlling a drainage control valve to be in an on state by mass flow calibration system software through a control bus, discharging all the electronic weighing metering solution, and clearing the accumulated total mass in the mass flow calibration system software.
13. Controlling and adjusting the opening state of the actuator switch from 1 to 100%, and carrying out mass flow calibration point calibration of which the mass flow measurement range of the mass flow meter to be calibrated is 1.0 times, and measuring and calibrating (delay time can be set) with delay time of 6 minutes;
14. controlling and adjusting the opening state of the actuator switch from 1% to 0%, acquiring whether the real-time mass flow output value of the standard meter is 0 through a data bus, and if the real-time mass flow output value is 0 and the real-time mass flow output value is delayed and waiting for no calibration solution to drop between the calibration pipeline terminal and the electronic scale, acquiring and recording the total mass of the output measurement of each mass flowmeter and the total mass of the measurement calibration solution of the electronic scale on line through the data bus by mass flow calibration system software;
15. repeating the steps 10) -14), and completing the calibration of mass flow of the online mass flowmeter measuring ranges of 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1, 0.05 and 0.02 times points to be calibrated;
16. and calculating mass flow coefficients corresponding to each mass flowmeter on line according to the calibrated data, and writing the coefficients into the EEPROM of the corresponding mass flowmeter converter through a data bus.
17. Automatically starting the precision and repeatability detection of the online mass flowmeter;
18. typically, 1.0, 0.75, 0.50, 0.25 and 0.1 times the online mass flowmeter range are selected as precision and repeatability detection points of the mass flowmeter;
19. and (3) carrying out mass flow verification point verification of which the mass flow is 1.0 times. The software of the mass flow calibration system controls and adjusts the opening of the actuator switch 1 to a point with the opening of 100%, acquires a real-time mass flow output value of a standard meter through a data bus, and adjusts the opening of the actuator switch 2 according to whether the actual mass flow output value reaches or approaches to a mass flow point with the mass flow range of 1.0 times of the mass flow of the mass flowmeter to be measured, so that the opening of the actuator switch meets the mass flow point with the mass flow range of 1.0 times of the mass flow of the mass flowmeter;
20. the actuator switch 1 is controlled to be in a closed state, the opening of the actuator switch 2 is unchanged, and the time is delayed for 2 minutes; the purpose of the time delay is to wait until no calibration solution drops between the calibration pipeline terminal and the electronic scale;
21. and (3) clearing the total mass of the standard meter and the mass flowmeter to be calibrated, and simultaneously recording and clearing the total mass value of the electronic scale.
22. Controlling and adjusting the opening state of the actuator switch from 1 to 100%, detecting the accuracy and repeatability of a mass flow point with the mass flow range of 1.0 times of the mass flow of the mass flowmeter, and delaying metering verification for 6 minutes;
23. controlling and adjusting the opening state of the actuator switch from 1% to 0%, acquiring whether the real-time mass flow output value of the standard meter is 0 through a data bus, and if the real-time mass flow output value is 0 and the real-time mass flow output value is delayed and waiting for no calibration solution to drop between the calibration pipeline terminal and the electronic scale, acquiring and recording the total mass of the output measurement of each mass flowmeter and the total mass of the measurement calibration solution of the electronic scale on line through the data bus by mass flow calibration system software;
24. repeating the steps 21) -23), and finishing the detection of the 2 nd precision and repeatability of the mass flow detection point with the mass flow of 1.0 times;
25. repeating the steps 21) -23), and finishing the detection of the 3 rd time precision and repeatability of the mass flow detection point with the mass flow of 1.0 times;
26. repeating steps 19) -25), and finishing the detection of the accuracy and repeatability of the mass flow rate of 0.75, 0.50, 0.25 and 0.1 times points;
27. and (5) reporting the calibration and detection results (precision and repeatability) of the online mass flowmeter of the production user.
In summary, the original manually operated calibration system is replaced by the computer automatically controlled calibration system, the computer is used for sending a control signal to adjust the opening of the actuator switch so as to control the flow rate of the calibration solution in the calibration pipeline, and the original calibration system can only calibrate at most two mass flowmeters, but can simultaneously calibrate five mass flowmeters at present, and the calibration process does not need to be manually participated, so that the calibration efficiency of the mass flowmeter is improved, and the calibration precision of the mass flowmeter is greatly improved; meanwhile, a constant-pressure constant-flow tank is introduced into the calibration system, so that the problems of trickle flow and air bubbles of the calibration solution generated during the working of the solution pump are solved, and the calibration precision of the mass flowmeter is essentially improved. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (7)
1. A mass calibration system for a mass flow meter, comprising:
a calibration solution device for providing a calibration solution required for calibration of the mass flowmeter;
a solution pump for providing power to flow the calibration solution at a pressure within the calibration tubing;
the standard meter is arranged on the calibration pipeline along the output direction of the solution pump and is used for providing reference data for the mass flow of the calibration solution in the calibration pipeline;
a plurality of mass flowmeters to be measured are uniformly arranged on the calibration pipeline along the output direction of the standard meter, and the number of the mass flowmeters to be measured is five at most;
the actuator switch is used for controlling whether the calibration solution in the calibration pipeline flows or not and also used for adjusting the mass flow rate of the calibration solution in the calibration pipeline in unit time; the actuator switch comprises a first actuator switch and a second actuator switch, wherein the first actuator switch is arranged on a calibration pipeline between the standard meter and the solution pump and is used for controlling whether the calibration solution in the calibration pipeline flows or not according to a first control signal output by a computer; the second actuator switch is arranged on a calibration functional channel between the electronic scale and the mass flowmeter close to the electronic scale and is used for adjusting the mass flow of the calibration solution in the calibration pipeline in unit time according to a second control signal output by the computer;
a constant-pressure constant-flow tank is arranged between the solution pump and the first actuator switch and is used for eliminating trickle in the calibration solution and air bubbles carried in the calibration solution;
the computer is respectively connected with the mass flowmeter, the standard meter, the actuator switch and the electronic scale; the electronic scale is used for adjusting the opening of the actuator switch according to the size of the reference data and reading the mass flowmeter to be measured according to the electronic scale; and the electronic scale is connected with the actuator switch and is used for measuring the flow quality of the overflow of the calibration pipeline of the mass flowmeter.
2. The mass flow meter mass calibration system of claim 1, wherein each of the mass flow meter and standard meter has a stationary frame on both sides for supporting operation thereof.
3. The mass flow meter mass calibration system of claim 1, wherein the computer is connected to the actuator switch, the standard meter, the mass flow meter and the electronic scale via a control bus, respectively.
4. The mass flow meter mass calibration system of claim 1, wherein the electronic scale is connected to a drain control valve controlled by the computer.
5. The mass flow meter mass calibration system of claim 4, wherein the computer is in control bus connection with the drain control valve.
6. A method of using the mass flow meter mass calibration system of any one of claims 1 to 5, comprising:
step 1, setting an aperture value and an upper limit value according to the type of a mass flowmeter to be tested;
step 2, adjusting the first actuator switch and the second actuator switch until the mass flowmeter to be tested has no leakage;
step 3, when the first actuator switch and the second actuator switch are adjusted to the full-point opening degree, until no bubbles are near in the measuring tubes of the calibration pipeline, the standard meter and the mass flowmeter;
step 4, when the first actuator switch and the second actuator switch are both adjusted to the zero opening, acquiring the current first reading of the standard table; detecting whether the calibration solution in the calibration pipeline is in a flowing state, if the calibration solution is in a non-flowing state, broadcasting and sending an automatic zero calibration instruction to a mass flowmeter to be tested, and adjusting the drainage control valve to be in a closed state until the automatic zero calibration is completed;
step 5, selecting a calibration point of the mass flowmeter according to the type and the measuring range of the mass flowmeter to be measured, wherein the calibration point selects a measuring range multiple point as a selection point, and the multiple point comprises 1.0, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1, 0.05 and 0.02;
step 6, calibrating by taking a certain selected point as a quality flow calibration point, adjusting a first actuator switch to be a full-point opening degree, and obtaining a current second reading of the standard table; adjusting the opening of a second actuator switch according to the mass flow rate corresponding to the second reading approaching the selected point until the mass flow meter to be measured reaches a mass flow calibration point corresponding to the selected point;
step 7, adjusting the first actuator switch to be a zero opening degree, and keeping the opening degree of the second actuator switch unchanged until no calibration solution drops between the calibration pipeline and the electronic scale;
step 8, clearing the total mass output by the standard meter and the mass flowmeter to be tested, recording the reading of the current electronic scale and resetting the reading;
step 9, adjusting the first actuator switch to be the full-point opening, and calibrating the mass flowmeter to be measured at a multiple point corresponding to the selected point as a mass flow calibration point according to the preset time delay;
step 10, adjusting a first actuator switch to be a zero opening degree, acquiring whether the current reading of a standard meter is zero, and acquiring and recording the total mass output by each mass flowmeter to be tested and the total mass of the calibration solution of the electronic scale if the current reading of the standard meter is zero and no calibration solution drops between the calibration pipeline and the electronic scale;
step 11, repeating the steps 6 to 10, and sequentially completing the calibration of the quality flow calibration points of other selected points; calculating a mass flow coefficient of each mass flowmeter according to the calibration data, and storing the mass flow coefficient in the mass flowmeter to be measured;
and 12, rescreening the measuring range multiple points of the mass flowmeter as selected points, detecting the precision and repeatability of each selected point according to steps 6 to 11, and recording the calibration and detection results of the mass flowmeter to be detected.
7. The mass flowmeter mass calibration method of claim 6, further comprising, prior to step 3: detecting whether the constant-pressure constant-flow tank is in a full-tank constant-pressure state, and if the constant-pressure constant-flow tank is not in the full-tank constant-pressure state, starting an exhaust switch until the solution pump changes the constant-pressure constant-flow tank into the full-tank constant-pressure state.
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