CN106643989B - Density calibration system and method for mass flowmeter - Google Patents
Density calibration system and method for mass flowmeter Download PDFInfo
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- G—PHYSICS
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- 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
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Abstract
The application provides a density calibration system and a method of a mass flowmeter, wherein the system comprises the following components: calibration solution means for providing a plurality of calibration solutions having different densities; a solution pump for providing power to flow the calibration solution at a pressure within the calibration tubing; the standard meter and the mass flow meters to be measured are uniformly arranged on the calibration pipeline along the output end of the solution pump; the standard table is used for calibrating the density of the calibrating solution in the pipeline; the computer is respectively connected with a plurality of mass flowmeters to be tested, a standard meter and a switch; the method is used for controlling the switch to switch the calibration solutions of different media to calibrate the density of the mass flowmeter, and the calculated density calibration coefficient is written into the corresponding mass flowmeter according to a density calibration mathematical model. The density of the mass flowmeter is measured for many times by adopting the calibration solution of the computer in different mediums, and the density of the mass flowmeter to be measured is calculated through a density calibration mathematical model, so that the calibration efficiency and precision are improved.
Description
Technical Field
The application belongs to the technical field of instrument correction, and particularly relates to a density calibration system and method of a mass flowmeter.
Background
The mass flowmeter is a flow metering instrument which is developed and designed by utilizing the fluid mechanics principle. The measuring device is mainly used for measuring the mass flow and density of gas and liquid, and parameters required by engineering such as volume flow, total mass, total volume and the like derived from the mass flow and the density. The mass flow meter can measure a wide range of fluids, including various liquids including high viscosity liquids, slurries containing solids, liquids containing small amounts of uniformly distributed gas, and gases having sufficient density, such as high pressure gases. In general, it is capable of measuring mass flow, density and temperature of liquids, suspensions, emulsions and gases.
The mass flow mathematical model of the mass flowmeter is established and realized, and the flow for realizing calibration in production is largely described in many papers, journals and patents at home and abroad, but the mathematical model in terms of density, the calibration method and the related calibration equipment have few literature data. For a mass flowmeter, the first parameter is mass flow, and the parameter related to the first parameter and output in a corresponding proportion is the phase difference of sine signals detected and output by two sides of a measuring tube of the sensor; the second parameter is density, which is related to the inherent mechanical frequency of the sensor itself, and only the presence of the second parameter density will there be engineering parameters such as volume flow and total volume derived from mass flow and density. Therefore, mass flow meters are used in many fields such as petroleum, petrochemical, paper, food, and pharmaceutical for measuring various parameters such as mass flow, density, and volumetric flow of conventional fluids, unconventional fluids, slurries, liquefied gases, and compressed natural gas. Therefore, it is important for manufacturers of mass flowmeters to improve the design, production and processing technology of mass flowmeter sensors, mass flow calibration devices and density calibration devices.
FIG. 1 is a schematic diagram of a prior art density calibration system for a Coriolis mass flowmeter, wherein a low pressure cylinder is used to store low pressure dry air at a pressure of less than 5 atmospheres; the air valve is used for controlling low-pressure air in the low-pressure cylinder to enter the switch of the calibration pipeline; a calibration solution vessel for holding a density calibrated medium solution, typically a calibration solution proportioned in the vessel; the solution inlet end is the initial end of the density calibration solution and is designed as a funnel, so that the calibration solution can flow into the sensor measurement pipeline through the port conveniently without side leakage; a calibration conduit for calibrating a channel through which the medium solution flows; the mass flowmeter is a mass flowmeter to be calibrated in density; the fixed base frame is a cement pile and is used for fixedly clamping a mass flowmeter to be calibrated; the solution outlet end is a terminal of the density calibration pipeline and is designed as a funnel, so that the calibration solution can flow into the container with the metering volume conveniently through the port; a switch for controlling the amount of density calibration solution flowing into the volumetric receptacle; the volume container is used for containing the density calibration medium solution and measuring the volume of the density calibration solution; and the electronic scale is used for measuring the mass of the density calibration solution in the volume container.
The calibration method flow of the density calibration system of the mass flowmeter in fig. 1 is described in detail as follows:
step 1, a mass flowmeter density calibration system is placed in a constant-temperature closed chamber at 25 ℃, and meanwhile, the air valve and a switch of a calibration pipeline terminal are in a closed state;
step 2, installing the mass flowmeter to be measured on the calibration pipeline in a mode shown in fig. 1, ensuring that the calibration pipeline and the mass flowmeter installing flange are in a sealed state, namely no leakage phenomenon exists, and simultaneously ensuring that the mass flowmeter shell is vertical to the ground;
step 3, electrifying the mass flowmeter to be subjected to density calibration, and simultaneously placing more than 5 kinds of calibration solutions (medium solution 1, medium solution 2 and medium solution 3 and … …) with different densities in a closed chamber for density calibration, and keeping the state for about 180 minutes, wherein the aim is to enable the temperature of the whole system for density calibration of the mass flowmeter and the temperature of the density calibration solution to be the same as or infinitely close to the temperature of the closed chamber;
step 4, collecting the empty pipe frequency of an output sensor on a mass flowmeter converter for density calibration on a current calibration pipeline in a constant-temperature closed room at the current temperature of 25 ℃;
step 5, opening a sealing cover on the solution inlet end, slowly pouring the density calibration medium solution 1 into the solution inlet end through a calibration solution vessel device, observing the liquid level change of the solution outlet end, and stopping the solution inlet end from continuously pouring the density calibration medium solution 1 when the liquid level approaches the top end of the solution outlet end;
step 6, delaying for 2 minutes until the density calibration medium solution 1 is in a stable state in the calibration pipeline device, and collecting the frequency value of the output sensor on the current mass flowmeter converter;
step 7, slowly adjusting a switch of a calibration pipeline terminal, and discharging the density calibration medium solution 1 in the pipeline to a container at the upper end of the electronic scale, so that the discharge amount of the density calibration medium solution 1 reaches the position of a 1000ml scale of the container;
step 8, obtaining mass indication of 1000ml of density calibration medium solution 1 measured on the electronic scale, pouring the density calibration medium solution 1 back into an original solution device, and replacing a dry container with the same capacity on the electronic scale;
step 9, pressing the sealing cover above the solution inlet end on the solution inlet end, slowly adjusting the air valve until the density calibration medium solution 1 in the calibration pipeline is expelled out of the calibration pipeline, and closing the air valve;
step 10, repeating the steps 5-9 to finish the calibration flow of other density calibration medium solutions (medium solution 2, medium solution 3 and … …);
step 11, calculating the density coefficient of the mass flowmeter to be density calibrated according to the density calibration record data, and writing the coefficient into an EEPROM of the mass flowmeter converter in a key operation mode;
step 12, detecting density precision and repeatability of the mass flowmeter;
step 13, opening a sealing cover on the solution inlet end and a switch of a calibration pipeline terminal, slowly pouring the density calibration medium solution 1 into the solution inlet end through a calibration solution vessel device, observing the change of the liquid level in the container, closing the switch of the calibration pipeline terminal when the liquid level scale is approximately 1000ml, and continuously pouring a proper amount of density calibration medium solution 1 into the solution inlet end;
step 14, finely adjusting the opening of a switch of a calibration pipeline terminal until the dripping value container of the density calibration medium solution 1 reaches the position of a 1000ml scale, and collecting the output density value of a current mass flowmeter converter and the total mass of the electronic scale metering density calibration medium solution 1;
step 15, pressing a sealing cover above the solution inlet end against the solution inlet end, finely adjusting an air valve until the density calibration medium solution 1 in the calibration pipeline is expelled out of the calibration pipeline, and closing the air valve;
step 16, repeating the steps 13-15 to finish the density verification process of other selected density calibration medium solutions;
and step 17, calculating the density output precision and repeatability of the mass flowmeter.
In the existing density calibration system of the Coriolis mass flowmeter, at most, only 3 mass flowmeters can be accommodated for density calibration and detection, so that the calibration efficiency of the mass flowmeter is greatly reduced; meanwhile, in the whole calibration and detection process, manual participation is needed, the density of the calibration solution is measured by taking a small container as a measurement volume, the mass of the calibration solution is measured by an electronic scale, and the standard value of the density of the calibration solution is determined through calculation. However, these factors can introduce some degree of metering calibration error, reducing the accuracy of the overall mass flowmeter density calibration system.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present application is to provide a system and a method for calibrating a density of a mass flowmeter, which are used for solving the problems of low efficiency and low accuracy of the density calibration of the whole mass flowmeter caused by manual operation in the density calibration of the mass flowmeter in the prior art.
To achieve the above and other related objects, the present application provides a density calibration system of a mass flowmeter, comprising:
calibration solution means for providing a plurality of calibration solutions having different densities;
a solution pump for providing power to flow the calibration solution at a pressure within the calibration tubing;
the standard meter and the mass flow meters to be measured are uniformly arranged on the calibration pipeline along the output end of the solution pump;
the standard table is used for calibrating the density of the calibrating solution in the pipeline;
the computer is respectively connected with a plurality of mass flowmeters to be tested, a standard meter and a switch; the method is used for controlling the switch to switch the calibration solutions of different media to calibrate the density of the mass flowmeter, and the calculated density calibration coefficient is written into the corresponding mass flowmeter according to a density calibration mathematical model.
The application also aims to provide a density calibration method of the mass flowmeter, which comprises the following steps:
step 1, initializing a density calibration system, and ensuring that a mass flowmeter to be tested tends to be in a stable state;
step 2, sequentially reading the frequency value output by the mass flowmeter to be tested when the mass flowmeter is in the empty pipe state;
step 3, a switch of a certain medium calibration solution device and a switch close to a standard meter are started, so that the calibration solution of the medium circularly flows in a calibration pipeline until the calibration solution flowing in the mass flowmeter to be tested has no bubbles;
step 4, closing a switch of the calibration solution device and a switch close to the standard meter until the calibration solution in the calibration pipeline is in a static state;
step 5, reading the current density value of the standard meter, and sequentially reading the frequency value output by the mass flowmeter to be tested;
step 6, repeating the steps 3 to 5 under the calibration solutions of different mediums to obtain the density value of the standard meter and the frequency value output by the mass flowmeter to be tested;
step 7, calling a density calibration mathematical model to sequentially calculate the density coefficient of each mass flowmeter to be measured, and writing the density coefficient into the corresponding mass flowmeter to be measured;
step 8, repeating the steps 3 to 4 for a plurality of times under each medium calibration solution to obtain a standard density value of a standard meter for a plurality of times calibration and a density value of a mass flowmeter to be tested for a plurality of times output;
and 9, calculating the precision of the mass flowmeter according to the standard density values corresponding to the various medium calibration solutions and the density values output by the mass flowmeter.
As described above, the density calibration system and method of the mass flowmeter of the application have the following beneficial effects:
the original manually operated density calibration system is replaced by the computer automatically controlled density calibration system, so that the number of the density calibration system is changed from three to ten compared with the number of the density calibration system in each time, and the product calibration efficiency is improved; the density of the mass flowmeter to be measured is calculated through a density calibration mathematical model without human participation in the calibration process, so that the calibration error of the traditional mass volume mode is avoided, and the density calibration precision of the mass flowmeter is greatly improved; meanwhile, a constant-pressure constant-flow tank is introduced into the density 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 application;
FIG. 2 is a diagram showing a structure of a density calibration system of a mass flowmeter according to the present application;
FIG. 3 is a diagram illustrating an exemplary embodiment of a density calibration system for a mass flow meter according to the present application;
fig. 4 shows a flow chart of a density calibration method of a mass flowmeter according to the present application.
Detailed Description
Further advantages and effects of the present application will become apparent to those skilled in the art from the disclosure of the present application, 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 application to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the application, are not intended to be critical to the essential characteristics of the application, but are intended to fall within the spirit and scope of the application. 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 application, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the application may be practiced.
Referring to fig. 2, the present application provides a structure diagram of a density calibration system of a mass flowmeter, including:
a calibration solution device 1 for providing a plurality of calibration solutions having different densities; a solution pump 3 for providing power to flow the calibration solution at a pressure within the calibration tubing; the standard meter 4 and a plurality of mass flow meters 5 to be measured are uniformly arranged on the calibration pipeline along the output end of the solution pump 3; the standard table 4 is used for calibrating the density of the calibration solution in the pipeline; a computer 6 connected to the mass flowmeter 5, the standard table 4 and the switch 3 to be measured; the method is used for controlling the switch 3 to switch calibration solutions of different media to calibrate the density of the mass flowmeter 5, and writing the calculated density calibration coefficient into the corresponding mass flowmeter 5 according to a density calibration mathematical model.
The computer 6 can be replaced by an industrial personal computer or a terminal, the number of the calibration solution devices 1 can be multiple, and each calibration solution device 1 contains calibration solution with the same medium density; the calibration solution device 1, the solution pump 3, the standard table 4 and the mass flowmeter 5 are connected with each other by using calibration pipelines; and a switch 2 is arranged on the calibration pipeline between the output end of each calibration solution device 1 and the solution pump 3, and a switch 2 is arranged on the calibration pipeline connected with the input end of each calibration solution device 1, wherein the switch 2 ensures that only one medium calibration solution flows in the calibration pipeline of the density calibration system each time.
The solution pump 3 and the standard table 4 are provided with a switch for controlling the flow of the calibration solution, the corresponding switch 2 is arranged at the position to ensure that the solution pump 3 can flow the calibration solution in the standard table 4 through the power of the switch, and simultaneously, when the switch is closed, the solution pump continuously operates to displace air bubbles stored in a calibration pipeline, wherein the switch 2 is a valve, a gate and an electromagnetic valve, preferably an electromagnetic valve, and can be directly controlled by a computer 6, the calibration solutions in different mediums are remotely controlled and switched through the computer 6, the density of the mass flowmeter 5 to be measured is measured for a plurality of times under each calibration solution, no artificial participation is needed in the calibration process, and the density of the mass flowmeter 5 to be measured is calculated through a density calibration mathematical model, so that the calibration error of the traditional mass volume mode is avoided, and the density calibration precision of the mass flowmeter 5 is greatly improved.
If the pressure and the flow rate of the calibration solution in the density calibration system are required, a constant-pressure constant-flow tank for stabilizing the flow and the pressure is arranged between the solution pump 3 and the switch 2 close to the standard table 4, and the exhaust switch is turned on until the calibration solution supplied by the solution pump 3 is fully filled in the constant-pressure constant-flow tank, the exhaust switch is turned off, so that the air bubbles in the calibration solution and the non-constant-pressure constant-flow state of the calibration solution are eliminated, and if the constant-pressure constant-flow tank is to be arranged, the bus is necessarily controlled to be connected with a computer, so that the aim of automatic control is fulfilled.
In the application, the computer 6 is communicated with a plurality of mass flow meters 5 to be measured, the standard table 4 and the switch 2 by adopting a control bus, the computer sends instructions to control the switch 2 to be turned on and off, data of the standard table 4 and the mass flow meters 5 are collected, and the density value and the precision of each mass flow meter 5 to be measured are calculated according to a density calibration mathematical model. The number of the mass flowmeters 5 to be measured is ten at most, and compared with the original mass flowmeters, the mass flowmeter can be used for calibrating three mass flowmeters at the same time, so that the calibration efficiency is improved.
In the application, the density calibration mathematical model is as follows:
in formula (1), ρ: the mass flowmeter calibrates the density of medium solution with unit kg/M 3 ；K d : calibrating the density coefficient of the calculated output, and having no dimension; f (F) e (25): measuring the resonance frequency of the tube at the constant temperature of 25 ℃ by the mass flowmeter sensor, wherein the unit is Hz; f (F) kt : the correction coefficient related to the material and structure of the whole mass flowmeter sensor and the temperature is usually the variation of the resonant frequency of the sensor measuring tube when the temperature is increased or decreased by 1 ℃; t: mass flowmeter sensor temperature; f (F) r : the mass flowmeter sensor measures the actual output frequency in Hz when the pipeline is full of the metering medium solution; meter for measuring timeCalculation of K d In the case of (1) according to the read F r And calculating the density of the medium solution calibrated by the mass flowmeter.
The device also comprises a fixed rack which is arranged on two sides of the mass flowmeter 5 and the standard meter 4 and is used for supporting the mass flowmeter 5 and the standard meter 4 to work, and the fixed rack is preferably a cement bracket, so that the influence of vibration of a pipeline on the mass flowmeter meter to be calibrated can be eliminated, and the influence of mechanical vibration of a sensor of the mass flowmeter 5 on the density calibration can be eliminated. Meanwhile, the fixed frame also plays a role in isolation between the mass flowmeters 5 of the online density calibration complete machine, and prevents the mutual influence between the mass flowmeters 5 to be density calibrated.
FIG. 3 is a diagram showing an embodiment of a density calibration system of a mass flowmeter according to the present application; comprising the following steps:
in this embodiment, the number of the mass flowmeters 5 to be density calibrated is ten, the standard table 4 and the ten mass flowmeters 5 are respectively installed on the calibration pipeline in the order from left to right along the output direction of the solution pump 3, and the two sides of the mass flowmeters 5 and the standard table 4 are used for supporting the fixed racks for working. The medium solution device 1 is divided into five calibration solutions respectively filled with different mediums, wherein the first to fifth electromagnetic valves are correspondingly arranged on the calibration pipelines of the output ends of the first to fifth medium solution devices 1 respectively, the sixth to tenth electromagnetic valves are correspondingly arranged on the calibration pipelines of the input ends of the first to fifth medium solution devices 1 respectively, the calibration pipelines output by the mass flowmeter 5 (namely, the rightmost mass flowmeter 5) with the number of tenth electromagnetic valves are respectively connected to the input ends of the medium solution devices 1, so that the calibration solution of each medium can return to the medium solution device 1 after being circulated in the calibration pipelines, and the eleventh electromagnetic valve is arranged on the calibration pipeline between the solution pump 3 and the standard table 4.
The computer 6 is respectively connected with the standard table 4, the plurality of mass flowmeters 5 and the plurality of electromagnetic valves in a control bus mode, and switches the calibration solution of each medium by controlling the electromagnetic valve switch, for example, when an eleventh electromagnetic valve is opened, the medium solution device 1 which needs to contain the calibration solution of a certain medium opens the electromagnetic valve and closes other electromagnetic valves, so that the calibration solution of the medium flows to the whole density calibration system, and when the calibration solution of the medium is in a static state without bubbles in a calibration pipeline, the output frequency of the mass flowmeter to be measured is sequentially read; calculating the density coefficient of each mass flowmeter to be measured through a density calibration mathematical model, and repeating the steps to obtain the density of each mass flowmeter to be measured 5 under the condition of one or more medium solutions, and calculating the precision of the corresponding mass flowmeter according to the density of the mass flowmeter to be measured 5.
Referring to fig. 4, a method for calibrating density of a mass flowmeter according to the present application includes:
step 1, initializing a density calibration system, and ensuring that a mass flowmeter to be tested tends to be in a stable state;
specifically, in the initializing process of the density calibrating system, a computer controls all switches to be in a closed state, and a mass flowmeter to be measured is installed in a calibrating pipeline to ensure that the mass flowmeter is in a sealed state, namely no leakage exists; the standard meter and the mass flowmeter are powered on, and the computer is connected with the standard meter, the mass flowmeter and the electromagnetic valve through bus control; for example, a delay of a few minutes is generally adopted, so that the mass flowmeter to be density calibrated is in a hollow pipe state of a calibration pipeline or tends to be in a stable working state.
Step 2, sequentially reading the frequency value output by the mass flowmeter to be tested when the mass flowmeter is in the empty pipe state;
step 3, a switch of a certain medium calibration solution device and a switch close to a standard meter are started, so that the calibration solution of the medium circularly flows in a calibration pipeline until the calibration solution flowing in the mass flowmeter to be tested has no bubbles;
step 4, closing a switch of the calibration solution device and a switch close to the standard meter until the calibration solution in the calibration pipeline is in a static state;
step 5, reading the current density value of the standard meter, and sequentially reading the frequency value output by the mass flowmeter to be tested;
step 6, repeating the steps 3 to 5 under the calibration solutions of different mediums to obtain the density value of the standard meter and the frequency value output by the mass flowmeter to be tested;
step 7, calling a density calibration mathematical model to sequentially calculate the density coefficient of each mass flowmeter to be measured, and writing the density coefficient into the corresponding mass flowmeter to be measured;
step 8, repeating the steps 3 to 4 for a plurality of times under each medium calibration solution to obtain a standard density value of a standard meter for a plurality of times calibration and a density value of a mass flowmeter to be tested for a plurality of times output;
and 9, calculating the precision of the mass flowmeter according to the standard density values corresponding to the various medium calibration solutions and the density values output by the mass flowmeter.
In this embodiment, the following procedure can be obtained by expanding the above-mentioned method procedure, which is described in detail below:
1. starting mass flowmeter density calibration system software in an industrial personal computer (computer), and closing all electromagnetic valves in the whole calibration system;
2. the mass flowmeter instrument to be density calibrated is sequentially arranged on the calibration pipeline from front to back (along the output direction of the solution pump, namely, the distance close to the solution pump is front, and the distance far away from the solution pump is back), so that a leakage-free state is ensured;
3. the mass flow and standard meter to be calibrated are initialized by power-on, and the communication bus is communicated with the bus communication interface of the industrial personal computer;
4. communication detection of mass flow and standard meter to be density calibrated is carried out, and each mass flow and standard meter on line is ensured to be normally communicated with mass flowmeter density calibration system software in the industrial personal computer;
5. triggering a density calibration system of the mass flowmeter in the industrial personal computer, and starting a density calibration flow of the online mass flowmeter;
6. delaying for about 3 minutes to enable the mass flow to be calibrated on line in a stable working state under the empty pipe state;
7. sequentially collecting frequency data of mass flow for on-line density calibration in the empty pipe state according to the numbering sequence from front to back;
8. the first electromagnetic valve, the sixth electromagnetic valve and the eleventh electromagnetic valve on the calibration pipeline are opened through the control bus, and other electromagnetic valves are in a closed state;
9. under the drive of a solution pump, the medium solution in the first medium solution device flows through a calibration pipeline, a standard meter and a mass flowmeter for online density calibration, and flows back to the first medium solution device through the calibration pipeline after circulation, and works for about five minutes in a delayed mode until the whole calibration pipeline and a measuring tube of the mass flowmeter for online density calibration are completely filled with the medium solution in the first medium solution device without bubbles;
10. closing the first electromagnetic valve, the sixth electromagnetic valve and the eleventh electromagnetic valve on the calibration pipeline through the control bus until the density calibration medium solution in the whole calibration pipeline is in a calm and no-flow state, for example, the calm and no-flow state can be achieved by adopting time delay of 1 minute;
11. reading a standard density value currently output by a standard table through a bus, and sequentially reading the output frequency value of the mass flow to be subjected to online density calibration in the state according to the serial number sequence;
12. repeating the steps 8) -11), and completing the density calibration flow of the medium solution in the second to fifth medium solution devices; the only difference, namely the solenoid valve of control, is the following:
the density calibration of the second medium solution device needs to be controlled by a second electromagnetic valve, a seventh electromagnetic valve and an eleventh electromagnetic valve;
the density calibration of the third medium solution device needs to be controlled by a third electromagnetic valve, an eighth electromagnetic valve and an eleventh electromagnetic valve;
a fourth electromagnetic valve, a ninth electromagnetic valve and an eleventh electromagnetic valve which need to be controlled for density calibration of the fourth medium solution device;
a fifth electromagnetic valve, a tenth electromagnetic valve and an eleventh electromagnetic valve which need to be controlled for density calibration of the fifth medium solution device;
13. calculating the density coefficient of each mass flowmeter in sequence according to the density calibration mathematical model of the internal package, and writing the density coefficient into the online mass flowmeter converter in sequence correspondingly;
14. repeatedly detecting and calculating the density output precision of the online mass flowmeter;
15. the first electromagnetic valve, the sixth electromagnetic valve and the eleventh electromagnetic valve on the calibration pipeline are opened through the control bus, and other electromagnetic valves are in a closed state;
16. under the drive of a solution pump, the medium solution in the first medium solution device flows through a calibration pipeline, a standard meter and a mass flowmeter for online density calibration, and flows back to the first medium solution device through the calibration pipeline after circulation, and works for about five minutes in a delayed mode until the whole calibration pipeline and a measuring tube of the mass flowmeter for online density calibration are completely filled with the medium solution in the first medium solution device without bubbles;
17. closing the first electromagnetic valve, the sixth electromagnetic valve and the eleventh electromagnetic valve on the calibration pipeline through the control bus until the density calibration medium solution in the whole calibration pipeline is in a calm and no-flow state, for example, the calm and no-flow state can be achieved by adopting time delay of 1 minute;
18. reading a standard density value output by a standard meter at the moment through a bus, sequentially reading a density value output by the mass flow to be density calibrated in the state from front to back, and calculating the precision of the mass flowmeter;
19. repeating steps 15) -18), and detecting the density of the medium solution in the first medium solution device for the second time;
20. repeating the steps 15) -18) by mass flowmeter density calibration system software, detecting the medium solution density in the first medium solution device for the third time, and sequentially calculating the repeatability of the density output of the online mass flowmeter;
21. repeating steps 15) -20), and completing verification of medium solution density output and repeatability in the second to fifth medium solution devices;
22. and (5) reporting the density calibration and detection results (precision and repeatability) of the online mass flowmeter of the production user.
In summary, the original manually operated density calibration system is replaced by the computer-controlled density calibration system, so that the calibration quantity of the original density calibration system is changed from three to ten for each time, and the product calibration efficiency is improved; the density of the mass flowmeter to be measured is calculated through a density calibration mathematical model without human participation in the calibration process, so that the calibration error of the traditional mass volume mode is avoided, and the density calibration precision of the mass flowmeter is greatly improved; meanwhile, a constant-pressure constant-flow tank is introduced into the density 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 application 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 application and its effectiveness, and are not intended to limit the application. 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 application. Accordingly, it is intended that all equivalent modifications and variations of the application 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 density calibration system for a mass flow meter, comprising:
the device comprises a plurality of calibration solution devices, a plurality of liquid crystal display devices and a plurality of liquid crystal display devices, wherein the plurality of calibration solution devices are used for providing a plurality of calibration solutions with different densities, each calibration solution device contains the calibration solution with the same density, a switch is arranged on a calibration pipeline between the output end of each calibration solution device and a solution pump, and a switch is arranged on the calibration pipeline connected with the input end of each calibration solution device;
a solution pump for providing power to flow the calibration solution at a pressure within the calibration tubing;
the standard meter and the mass flow meters to be measured are uniformly arranged on the calibration pipeline along the output end of the solution pump;
the standard table is used for calibrating the density of the calibrating solution in the pipeline; a constant-pressure constant-current tank for stabilizing current and voltage is arranged between the solution pump and a switch close to the standard meter;
the computer is respectively connected with a plurality of mass flowmeters to be tested, a standard meter and a switch; the method is used for controlling the switch to switch the calibration solutions of different media to calibrate the density of the mass flowmeter, and the calculated density calibration coefficient is written into the corresponding mass flowmeter according to a density calibration mathematical model.
2. The mass flowmeter density calibration system of claim 1, wherein a switch for controlling the flow of the calibration solution is provided between the solution pump and the standard meter.
3. The mass flow meter density calibration system of claim 2, wherein the switch is a solenoid valve.
4. The mass flowmeter density calibration system of claim 1, wherein the computer communicates with the mass flowmeter to be measured, the standard meter and the switch using a control bus.
5. The mass flowmeter density calibration system of claim 1, further comprising a stationary frame disposed on either side of the mass flowmeter and standard meter for supporting operation thereof.
6. The mass flowmeter density calibration system of claim 1, wherein the number of mass flowmeters to be measured is at most ten.
7. A method for calibrating density of a mass flowmeter, comprising:
step 1, initializing a density calibration system, and ensuring that a mass flowmeter to be tested tends to be in a stable state;
step 2, sequentially reading the frequency value output by the mass flowmeter to be tested when the mass flowmeter is in the empty pipe state;
step 3, a switch of a certain medium calibration solution device and a switch close to a standard meter are started, so that the calibration solution of the medium circularly flows in a calibration pipeline until the calibration solution flowing in the mass flowmeter to be tested has no bubbles;
step 4, closing a switch of the calibration solution device and a switch close to the standard meter until the calibration solution in the calibration pipeline is in a static state;
step 5, reading the current density value of the standard meter, and sequentially reading the frequency value output by the mass flowmeter to be tested;
step 6, repeating the steps 3 to 5 under the calibration solutions of different mediums to obtain the density value of the standard meter and the frequency value output by the mass flowmeter to be tested;
step 7, calling a density calibration mathematical model to sequentially calculate the density coefficient of each mass flowmeter to be measured, and writing the density coefficient into the corresponding mass flowmeter to be measured;
step 8, repeating the steps 3 to 4 for a plurality of times under each medium calibration solution to obtain a standard density value of a standard meter for a plurality of times calibration and a density value of a mass flowmeter to be tested for a plurality of times output;
and 9, calculating the precision of the mass flowmeter according to the standard density values corresponding to the various medium calibration solutions and the density values output by the mass flowmeter.
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| CN107340038A (en) * | 2017-06-06 | 2017-11-10 | 重庆川仪自动化股份有限公司 | Mass flowmenter automatic Calibration and measuring and testing device system and detection method |
| CN107144325B (en) * | 2017-06-06 | 2023-09-01 | 重庆川仪自动化股份有限公司 | Calibration and detection device for mass flowmeter |
| CN111908411B (en) * | 2020-08-06 | 2022-09-06 | 榆林市镇北台网络科技有限公司 | Fluid conveying control device, wine selling machine and fluid conveying control method |
| CN112746004A (en) * | 2021-02-03 | 2021-05-04 | 河北工业大学 | Alcohol content online detection segmented liquor picking equipment based on density |
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