CN215726268U - Flow sensor verification system - Google Patents
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- CN215726268U CN215726268U CN202121709491.9U CN202121709491U CN215726268U CN 215726268 U CN215726268 U CN 215726268U CN 202121709491 U CN202121709491 U CN 202121709491U CN 215726268 U CN215726268 U CN 215726268U
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Abstract
The application provides a flow sensor verification system, has solved the problem that the single flow controller among the prior art can't realize the flowmeter to be measured of wide range ratio and single detecting system can't realize the examination of different grade type gas flowmeter. The flow sensor verification system comprises a pipeline loop and a standard component arranged in the pipeline loop; the standard assembly comprises a gating assembly and a plurality of standard flowmeters connected with the gating assembly, wherein the gating assembly is used for selecting one of the plurality of standard flowmeters to be communicated with the pipeline loop, and the measuring ranges of the plurality of standard flowmeters are different.
Description
Technical Field
The application relates to the technical field of gas flow sensors, in particular to a flow sensor verification system.
Background
Currently, a flow controller is generally used to perform calibration (including calibration and calibration) on a flow meter under test. However, since the dynamic measurement range of the flow controller is small, in order to implement the calibration of the flow meter to be measured with a wide range ratio, a plurality of flow controllers with different ranges are often required to be equipped, which results in a huge cost. In addition, the system can realize the measurement of the gas flow meters with different principles, is not limited to the mass flow measurement principle and the volume flow measurement principle, brings more convenience to manufacturers using the flow sensor principle, and saves the test cost.
SUMMERY OF THE UTILITY MODEL
In view of this, embodiments of the present application are directed to provide a flow sensor verification system, so as to solve the problem that a single flow controller in the prior art cannot implement verification of a flow meter to be tested with a wide range ratio and the problem that the same test system implements calibration of gas flow meters with different principles.
The application provides a flow sensor verification system, which comprises a pipeline loop and a standard component arranged in the pipeline loop; the standard assembly comprises a gating assembly and a plurality of standard flowmeters connected with the gating assembly, wherein the gating assembly is used for selecting one of the plurality of standard flowmeters to be communicated with the pipeline loop, and the measuring ranges of the plurality of standard flowmeters are different.
In one embodiment, the gating assembly includes a plurality of electromagnetic switching elements connected in a one-to-one correspondence with a plurality of standard flow meters. The flow sensor verification system also comprises a controller and a variable frequency fan arranged in the pipeline loop; the controller is connected with the variable-frequency fan and the plurality of electromagnetic switch elements; the controller is used for controlling the variable frequency fan to rotate at a preset frequency according to a received control instruction, determining output flow corresponding to the preset frequency, and controlling the electromagnetic switch element corresponding to the output flow to be turned on according to the output flow by combining a pre-stored corresponding relation of the output flow, a standard flowmeter range and the electromagnetic switch element.
In one embodiment, the intersection of the output flows corresponding to different standard flowmeter ranges in the output flow-standard flowmeter range-electromagnetic switch element correspondence is an empty set.
In one embodiment, the controller comprises an industrial personal computer.
In one embodiment, the flow sensor verification system further comprises a component under test disposed in the conduit loop; the component to be tested comprises at least one flowmeter to be tested which is arranged in series.
In one embodiment, the flow sensor verification system further comprises a data acquisition module and a controller, wherein the data acquisition module is used for acquiring standard readings of the standard flowmeter gated by the gating component and to-be-tested readings of at least one to-be-tested flowmeter; the controller is used for verifying the reading to be detected according to the standard reading.
In one embodiment, the standard flow meter and the flow meter to be tested are in parallel with their gas paths.
In one embodiment, the conduit loop comprises a first section and a second section; the downstream side of the first section is connected with the gating assembly, and the second section is connected with the standard assembly and the assembly to be tested. The flow sensor verification system also includes a plurality of tube mounts located in the first and second sections, respectively.
In one embodiment, the flow sensor verification system further comprises a flow stabilizer disposed in the conduit loop.
In one embodiment, the flow stabilizer includes a laminar flow member located on the upstream side of the module.
In one embodiment, the flow stabilizer further comprises a variable frequency fan and a gas circulation stabilizing cavity, the variable frequency fan is arranged in the pipeline loop, and the gas circulation stabilizing cavity is used for carrying out pressure equalizing treatment on the gas before the gas enters the variable frequency fan.
In one embodiment, the gas circulation stabilizing cavity is a tank-shaped structure surrounded by a screen, and the variable frequency fan is positioned in the gas circulation stabilizing cavity.
In one embodiment, the flow sensor verification system further comprises a noise abatement device disposed in the conduit loop; the pipeline loop comprises an air outlet positioned in the gas circulation stabilizing cavity, and the silencing device is positioned in the gas circulation stabilizing cavity and is arranged at the air outlet.
In one embodiment, the flow sensor verification system further comprises a filter disposed in the conduit loop; the filter is located between variable frequency fan and the standard component.
A flow sensor verification system is provided according to the present application that includes a gating assembly and a plurality of standard flow meters of different ranges connected to the gating assembly. For the flowmeter to be tested with the wide range ratio, the gating component can be used for sequentially gating the plurality of standard flowmeters, and the plurality of standard flowmeters are respectively used for verifying different measurement intervals of the flowmeter to be tested, so that the verification of the flowmeter to be tested with the wide range ratio is realized. It can be seen that the flow sensor verification system is suitable for the verification of the flow meter to be tested with a wide range ratio, and the cost of the flow sensor verification system is lower than the total cost of the flow controllers with a plurality of different ranges. Furthermore, the standard flow meter of the test system may be a standard flow meter of different principles and is not limited to mass flow and volume flow measurement principles. Therefore, the testing system can meet the verification requirements of the gas flow meters with different testing principles.
Drawings
Fig. 1 is a block diagram of a flow sensor verification system according to a first embodiment of the present application.
Fig. 2 is a block diagram of a flow sensor verification system according to a second embodiment of the present application.
Fig. 3 is a block diagram of a flow sensor verification system according to a third embodiment of the present application.
Fig. 4 is a block diagram of a flow sensor verification system according to a fourth embodiment of the present application.
Fig. 5 is a block diagram of a flow sensor verification system according to a fifth embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a block diagram of a flow sensor verification system according to a first embodiment of the present application. As shown in fig. 1, the flow sensor verification system 10 includes a pipeline loop, a standard component 11, a component 12 to be tested, and a variable frequency fan 13 disposed in the pipeline loop.
The variable frequency fan 13 is used for controlling the flow speed of the detection medium in the pipeline loop. The calibration assembly 11 includes a gating assembly 110 and a plurality of calibration flow meters connected to the gating assembly 110, i.e., a plurality of calibration flow meters arranged in parallel, the plurality of calibration flow meters having different ranges. The gating assembly 110 is used to select one of a plurality of standard flow meters to communicate with the pipe loop. The component under test 12 includes at least one flow meter under test arranged in series. The plurality of standard flow meters includes a minimum-range standard flow meter and a maximum-range standard flow meter, and the range of each flow meter to be tested is greater than or equal to the range of the minimum-range standard flow meter and less than or equal to the range of the maximum-range standard flow meter.
In one embodiment, the standard flow meters are selected and flexibly combined according to the measuring range of the flowmeter to be measured, namely, the selected one or more standard flowmeters are ensured to cover the full measuring range of the flowmeter to be measured. Specifically, when a plurality of standard flowmeters are needed to complete the full-scale inspection of the flowmeter to be inspected, two standard flowmeters having adjacent scales in the plurality of standard flowmeters can be set to have coverage areas of about 10%. For example, the measurement range required by the flowmeter to be measured is 0.3L/min to 250L/min, two standard flowmeters can be selected, including a first standard flowmeter and a second standard flowmeter, the measurement range of the first standard flowmeter is 0.2L/min to 20L/min, and the measurement range of the second standard flowmeter is 15L/min to 300L/min.
In one embodiment, a standard flow meter is selected, and the standard flow meter are flexibly combined according to the measuring range and the accuracy of the flow meter to be measured. Specifically, the range ratios of different types of flow meters are different, for example, the range ratio of thermal mass flow meters is typically greater than 300:1, the range ratio of turbine flow meters is typically 10:1, and so on. For either type of meter, flow sensing is most accurate in the middle range of the span, e.g., between 10% and 90% of the span. Therefore, also taking the flowmeter to be measured in the above example as an example, in order to ensure the calibration accuracy, when the flow value to be measured is within the range of 2L/min to 18L/min, the first standard flowmeter is selected; and when the flow value to be measured is in the range of 44L/min to 272L/min, selecting the second standard flowmeter to ensure that the reading of the standard flowmeter of each measuring range is positioned in the middle measuring range section.
In this case, the process of calibrating the flow meter to be measured by using the flow sensor verification system 10 includes: first, the control gating component 110 gates the first standard flow meter; secondly, controlling the variable frequency fan 13 to rotate at a preset frequency; next, the standard reading of the selected first standard flowmeter and the actual reading of the flowmeter under test are recorded. And adjusting the preset frequency, and repeatedly executing the process until the measurement range of the first standard flowmeter does not meet the requirement any more. The control gating component 110 then gates the second reference flow meter, again adjusts the predetermined frequency and repeats the same process described above for gating the first reference flow meter until the measurement range of the second reference flow meter no longer meets the requirements. The actual readings of the meter under test can then be corrected using the plurality of standard readings.
Flow meters can be divided into various types according to the measurement principle. In the present embodiment, the types of the reference flowmeter and the flowmeter to be measured are respectively selected from at least one of a thermal mass flowmeter, a turbine flowmeter, a differential pressure flowmeter, and an ultrasonic flowmeter. The plurality of standard flow meters may be of the same type or of different types. When the number of the flowmeters to be tested is multiple, the types of the multiple flowmeters to be tested are the same or different. When the flowmeter to be measured is checked, the type of the selected standard flowmeter may be any, that is, the type of the selected standard flowmeter may be the same as the type of the flowmeter to be measured or different from the type of the flowmeter to be measured. It can be seen that the flow sensor calibration system 10 is suitable for calibrating both the same type of flow meters to be tested with multiple measurement ranges and the multiple types of flow meters to be tested with multiple measurement ranges.
The flow sensor verification system 10 provided by the embodiment includes a gating component 110 and a plurality of standard flowmeters with different ranges connected to the gating component 110, and for a flowmeter to be tested with a wide range ratio, the gating component 110 can sequentially gate the plurality of standard flowmeters, and the plurality of standard flowmeters are respectively used for verifying different measurement intervals of the flowmeter to be tested, thereby realizing verification of the flowmeter to be tested with the wide range ratio. It can be seen that the flow sensor verification system 10 is suitable for the verification of flow meters under test at a wide range ratio, and the cost of the flow sensor verification system 10 is less than the total cost of the flow controllers at multiple different ranges. Meanwhile, the matching verification of the flowmeter to be detected can be realized by connecting a plurality of flowmeters to be detected in series in the component 12 to be detected, and the verification efficiency is improved.
It should be appreciated that when the range of the meter under test is relatively small, e.g., the range of the meter under test is less than or equal to the range of at least one standard meter, a full-range verification of the meter under test can be achieved with only one standard meter.
Fig. 2 is a block diagram of a flow sensor verification system according to a second embodiment of the present application. As shown in fig. 2, in the present embodiment, the flow sensor verification system 20 further includes a data acquisition module 15 and a controller 16. The data acquisition module 15 is used for acquiring the standard reading of the standard flowmeter gated by the gating component 110 and the to-be-measured reading of at least one to-be-measured flowmeter. The controller is used for verifying the reading to be detected according to the standard reading. In one example, the data acquisition module 15 is a data acquisition card. In one example, the controller 15 is an industrial personal computer. The industrial personal computer is low in cost and high in compatibility. In this case, the data acquisition module 15 and the controller 16 are used for data recording and data processing instead of human beings, so that the labor cost is saved, and the automation degree of the flow sensor verification system 20 is improved.
Fig. 3 is a block diagram of a flow sensor verification system according to a third embodiment of the present application. As shown in fig. 3, in the present embodiment, the gating assembly 110 in the flow sensor verification system 30 includes a plurality of electromagnetic switching elements connected in a one-to-one correspondence with a plurality of standard flow meters. In one example, the electromagnetic switching element is a solenoid valve. The controller 16 is configured to control the variable frequency fan 13 to rotate at a predetermined frequency according to the received control instruction, determine an output flow rate corresponding to the predetermined frequency, and control an electromagnetic switch element corresponding to the output flow rate to be turned on according to the output flow rate in combination with a correspondence between a prestored output flow rate and a standard flowmeter range and the electromagnetic switch element.
In particular, predetermined frequency channelsWhich is often manually configured, is transmitted to the controller 16 via an input device, such as a touch screen, buttons, mouse, or keyboard. The controller 16 receives a control command containing a predetermined frequency, controls the variable frequency fan 14 to rotate at the predetermined frequency, and combines a formula according to the predetermined frequency
(wherein n is the rotating speed, f is the frequency, s is the number of electrode pairs of the variable frequency fan, Q1At a rotation speed of n1The flow rate of the time; q2At a rotation speed of n2Time flow) to calculate the output flow corresponding to the preset frequency.
In the corresponding relation of the output flow, the standard flowmeter range and the electromagnetic switch element, the corresponding relation between the output flow and the standard flowmeter range is set manually. In an embodiment, the correspondence between the output flow and the range of the standard flowmeter is flexibly combined according to the range and/or accuracy of the standard flowmeter, and the specific combining process refers to the embodiment shown in fig. 1, which is not described herein again. The correspondence between the range of the standard flowmeter and the electromagnetic switch element is determined by the system connection relationship.
Table 1 is a table of output flow, range of a standard flowmeter, and electromagnetic switch element correspondence provided in an embodiment of the present application. As shown in Table 1, the standard cell 11 includes 3 standard flowmeters each having a span of 9m3/min，27m3/min，45m3Min; the output flow rates corresponding to the 3 standard flowmeters are respectively 0.5-9 m3/min，6～27m3/min，25～45m3And the numbers of the electromagnetic switch elements corresponding to the 3 standard flowmeters are 1,2 and 3 respectively.
Table 1 output flow-standard flowmeter range-electromagnetic switch element corresponding relation table
| Output flow (m)3/min) | Range (m) of standard flowmeter3/min) | Electromagnetic switch element (number) |
| 0.5～9 | 9 | 1 |
| 6～27 | 27 | 2 |
| 25～45 | 45 | 3 |
In one embodiment, as shown in table 1, the intersection of the output flows corresponding to different standard flowmeter ranges in the output flow-standard flowmeter range-electromagnetic switch element correspondence is an empty set, that is, the output flows corresponding to different standard flowmeter ranges do not intersect. In this case, the output flow rate corresponding to the predetermined frequency corresponds to only one standard flowmeter, thereby facilitating selection of a matching standard flowmeter from among the plurality of standard flowmeters. The software algorithm is simple and easy to realize. It should be understood that in other embodiments, it may be set that the intersection of the output flows corresponding to different standard flow meter ranges is not an empty set, i.e., there is an intersection of the output flows corresponding to different standard flow meter ranges. In this case, it is necessary to further set conditions for further gating one best matching standard flowmeter from among a plurality of standard flowmeters matching a predetermined frequency. In one embodiment, a low range standard flow meter is selected that is adapted to the output flow. For example,referring to Table 1, when the output flow rate is 8m3At/min, the selection range is 9m3The standard flowmeter of/min, namely the gating electromagnetic switch element 1.
Fig. 4 is a block diagram of a flow sensor verification system according to a fourth embodiment of the present application. As shown in fig. 4, in the present embodiment, the air passages of the standard flow meter and the flow meter to be measured are parallel. For example, the air passages of a plurality of standard flow meters are arranged in parallel in the vertical direction or the horizontal direction, and the air passages of at least one flow meter to be measured are coaxial. In this way, airflow stability may be improved.
In one embodiment, as shown in fig. 4, the conduit loop includes a first section a and a second section B. The downstream side of the first section a is connected to the gating assembly 110, and the position of the upstream side of the first section a is optional. For example, an upstream side of the first section a is connected to a laminar flow member 17 (described below in detail); for another example, the upstream side of the first section is connected to the variable frequency fan 13. The second section B connects the standard component 11 and the component 12 to be tested. The flow sensor verification system 40 also includes a plurality of conduit supports (shown as cross-hatched rectangular boxes in fig. 4) located in the first section a and the second section B, respectively. The pipeline support is used for fixing the pipeline loop, so that the pipeline vibration phenomenon generated by high-speed airflow is reduced, the airflow fluctuation is further reduced, and the airflow stability is further improved.
In one embodiment, the flow sensor verification system 40 further comprises a flow stabilizer disposed in the conduit loop. The flow stabilizer acts to stabilize the gas flow and ensures that the gas in the conduit loop is at a high flow rate, e.g. a gas flow rate of greater than or equal to 500m3The flow sensor verification system 40 still has sufficient stability and high accuracy at/h.
Specifically, the flow stabilizer includes a laminar flow member 17, and the laminar flow member 17 is located on the upstream side of the module 11, i.e., the laminar flow member 17 is located between the variable frequency fan 13 and the module 11. The laminar flow member 17 serves to stabilize the air flow and reduce the eddy flow. In one example, the laminar flow member 17 is a plurality of capillaries arranged in parallel, or a honeycomb member, a sector member, or the like. By providing the laminar flow member 17 on the upstream side of the module 11, it is possible to ensure that the flow of air into the module 11 is smooth, thereby ensuring that the standard flow meter readings are more accurate.
As shown in fig. 4, the flow stabilizer further comprises a gas circulation stabilization chamber 18 for equalizing the pressure of the gas before the gas enters the variable frequency fan 13. In one embodiment, the gas circulation stabilizing cavity 18 is a tank-shaped structure surrounded by a screen, the mesh on the screen can play a role in balancing gas pressure, and the shape and the size of the mesh can be reasonably set according to actual needs. The variable frequency fan 13 is positioned in the gas circulation stable cavity 18, and an air outlet of the variable frequency fan 13 is communicated with the pipeline loop. Under this condition, the outside gas passes through gas circulation earlier and stabilizes the chamber 18 in order to balance the atmospheric pressure, later gets into in the frequency conversion fan 13 again, has improved the air current stability, has alleviated the unstable problem that leads to the standard flowmeter reading unstability because of the air current.
It should be appreciated that the present embodiment provides a flow sensor verification system 40 that includes both the laminar flow member 17 and the gas circulation stabilization chamber 18. In other embodiments, the flow sensor verification system 40 may include only one of the laminar flow member 17 and the gas circulation stability chamber 18.
Fig. 5 is a block diagram of a flow sensor verification system according to a fifth embodiment of the present application. As shown in fig. 5, the flow sensor verification system 50 further includes a silencer 191 and a filter 192 disposed in the piping loop. Wherein the silencer 191 is used to reduce noise generated by the airflow. In one example, the muffler 191 is a muffler. The pipe loop comprises an air outlet positioned in the gas circulation stable cavity 18, and the silencing device 191 is positioned in the gas circulation stable cavity 18 and is arranged at the air outlet. The filter 192 is located between the variable frequency fan 13 and the module 11, and in particular between the variable frequency fan 13 and the laminar flow member 17. The filter 192 is used for filtering impurities such as particles, oil stains and water vapor in the gas output by the variable frequency fan 13, and preventing the impurities from polluting the pipeline loop, the standard component 11 and the component 12 to be tested.
In one embodiment, as shown in FIG. 5, the flow sensor verification system 50 further includes a crossover joint (shown as a rectangular box with grid shading in FIG. 5) disposed in the piping loop for connecting the hose section and the hard pipe section, with both the first section A and the second section B being located on the hard pipe section. The flexible tube section is made of plastic, for example, and the rigid tube section is made of stainless steel, for example. Specifically, 2 adapters are provided in the flow sensor verification system 50, each of the 2 adapters being located outside the gas circulation stability chamber 18. Wherein, one conversion joint is used for connecting the downstream side of the first hose section and the upstream side of the hard pipe section, and the upstream side of the first hose section is connected with the air outlet of the variable frequency fan 13; the other crossover joint is used to connect the downstream side of the stiff pipe section to the upstream side of the second hose section, which is connected to the muffler 191. The advantage of providing a hose section is that the hose connection is flexible and not limited by position. And the hose section is far away from the standard component 11 and the component 12 to be tested, so that the verification precision is not influenced.
It should be appreciated that the present embodiment provides a flow sensor verification system 50 that includes both a noise abatement device 191 and a filter 192. In other embodiments, the flow sensor verification system 50 may include only one of the acoustic abatement device 191 and the filter 192.
The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit embodiments of the application to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.
Claims (14)
1. A flow sensor verification system comprising a conduit loop, and a standard component disposed in the conduit loop; the standard assembly comprises a gating assembly and a plurality of standard flowmeters connected with the gating assembly, wherein the gating assembly is used for selecting one of the standard flowmeters to be communicated with the pipeline loop, and the range of the standard flowmeters is different.
2. The flow sensor verification system according to claim 1, wherein the gating assembly comprises a plurality of electromagnetic switching elements connected in a one-to-one correspondence with a plurality of the standard flow meters;
the flow sensor verification system also comprises a controller and a variable frequency fan arranged in the pipeline loop; the controller is connected with the variable frequency fan and the plurality of electromagnetic switch elements; the controller is used for controlling the variable frequency fan to rotate at a preset frequency according to a received control instruction, determining output flow corresponding to the preset frequency, and controlling the electromagnetic switch element corresponding to the output flow to be turned on according to the output flow by combining a pre-stored corresponding relation of the output flow, a standard flowmeter range and the electromagnetic switch element.
3. The flow sensor verification system according to claim 2, wherein the intersection of the output flows corresponding to different standard flow meter ranges in the output flow-standard flow meter range-electromagnetic switch element correspondence is an empty set.
4. The flow sensor verification system according to claim 2, wherein the controller comprises an industrial personal computer.
5. The flow sensor verification system according to any one of claims 1-4, further comprising a component to be tested disposed in the conduit loop; the component to be tested comprises at least one flowmeter to be tested which is arranged in series.
6. The flow sensor verification system according to claim 5, further comprising a data acquisition module and a controller, wherein the data acquisition module is configured to acquire the standard readings of the standard flow meter and the to-be-tested readings of at least one of the to-be-tested flow meters gated by the gating assembly; and the controller is used for verifying the reading to be detected according to the standard reading.
7. The flow sensor verification system according to claim 5, wherein the standard flow meter and the flow meter under test have parallel gas paths.
8. The flow sensor verification system according to claim 7, wherein the conduit loop comprises a first section and a second section; the downstream side of the first section is connected with the gating assembly, and the second section is connected with the standard assembly and the assembly to be tested;
the flow sensor verification system further includes a plurality of tube mounts located in the first and second sections, respectively.
9. The flow sensor verification system according to any one of claims 1-4, further comprising a flow stabilizer disposed in the conduit loop.
10. The flow sensor verification system according to claim 9, wherein the flow stabilizer comprises a laminar flow member located on an upstream side of the standard cell.
11. The flow sensor verification system according to claim 9, wherein the flow stabilizer further comprises a variable frequency fan disposed in the pipeline loop and a gas circulation stabilization chamber for equalizing the pressure of the gas before the gas enters the variable frequency fan.
12. The flow sensor verification system according to claim 11, wherein the gas circulation stability chamber is a tank-shaped structure surrounded by a screen, and the variable frequency fan is located in the gas circulation stability chamber.
13. The flow sensor verification system according to claim 11, further comprising a noise dampening device disposed in the conduit loop; the pipeline loop comprises an air outlet positioned in the gas circulation stabilizing cavity, and the silencing device is positioned in the gas circulation stabilizing cavity and arranged at the air outlet.
14. The flow sensor verification system according to claim 11, further comprising a filter disposed in the conduit loop; the filter is located between the variable frequency fan and the standard component.
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| CN116046115A (en) * | 2022-12-09 | 2023-05-02 | 国电环境保护研究院有限公司 | Reliability verification test system of online flue gas flow monitoring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116046115A (en) * | 2022-12-09 | 2023-05-02 | 国电环境保护研究院有限公司 | Reliability verification test system of online flue gas flow monitoring device |
| CN116046115B (en) * | 2022-12-09 | 2024-04-19 | 国电环境保护研究院有限公司 | Reliability verification test system of online flue gas flow monitoring device |
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