CN112378499A - Calibration device and calibration method for air blowing type liquid level meter - Google Patents
Calibration device and calibration method for air blowing type liquid level meter Download PDFInfo
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- CN112378499A CN112378499A CN202011387739.4A CN202011387739A CN112378499A CN 112378499 A CN112378499 A CN 112378499A CN 202011387739 A CN202011387739 A CN 202011387739A CN 112378499 A CN112378499 A CN 112378499A
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- 239000007788 liquid Substances 0.000 title claims abstract description 195
- 238000007664 blowing Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000012780 transparent material Substances 0.000 claims abstract description 18
- 238000004891 communication Methods 0.000 claims description 30
- 238000005259 measurement Methods 0.000 abstract description 10
- 239000007789 gas Substances 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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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
- G01F25/20—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level
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Abstract
The invention provides a calibration device and a calibration method of an air blowing type liquid level meter. The calibration device comprises a first container, a second container, a vacuum pump, an air source, a water pump, a pressure gauge and a pressure control valve; the pressure meter and the pressure control valve are simultaneously arranged on the first container or the second container; the first container also has at least one of the following features: be provided with the standard level gauge that is used for measuring the inside liquid level of first container, make by transparent material and be provided with the first scale that is used for showing the liquid level, be provided with the first connecting pipe that communicates with first container and first connecting pipe make by transparent material and be provided with the cross-sectional area that is used for showing the second scale of liquid level and first connecting pipe on the first connecting pipe and be less than the cross-sectional area of first container. The air blowing type liquid level meter to be calibrated is calibrated according to the practical application working condition of the air blowing type liquid level meter, and the zero scale position of the air blowing type liquid level meter after calibration does not drift any more under the practical working condition, so that the accuracy of liquid level measurement is improved.
Description
Technical Field
The invention relates to the field of liquid level measurement, in particular to a calibration device and a calibration method of an air blowing type liquid level meter.
Background
The air blowing type liquid level meter can also be called a pressure type liquid level meter, and a calibration device of the existing air blowing type liquid level meter is generally shown in figure 1 and mainly comprises an open container 1, wherein a mounting flange 2 and a scale 3 for displaying the liquid level are arranged on the container 1. The calibration process of the liquid level is as follows: the liquid level meter to be calibrated is installed on the installation flange 2, then the liquid level is raised and lowered by injecting water and discharging water into the container 1, and the accuracy of the liquid level meter can be reflected by the liquid level displayed by the scale 3 and the liquid level displayed by the liquid level meter, so that the liquid level meter is calibrated.
However, since the container 1 is an open normal pressure container, the reaction kettle in actual production is usually a vacuum or positive pressure container, and when the air blowing type liquid level meter calibrated by the container 1 measures the liquid level in the reaction kettle, the zero scale position of the air blowing type liquid level meter drifts, which results in inaccurate measurement results.
Disclosure of Invention
The invention provides a calibration device and a calibration method of an air blowing type liquid level meter, which aim to solve the technical problem that the measurement result of the existing air blowing type liquid level meter is inaccurate under the working condition of vacuum or positive pressure after the air blowing type liquid level meter is calibrated under normal pressure.
In order to solve the technical problem, the invention provides a calibration device of an air blowing type liquid level meter, which comprises a first container, a second container, a vacuum pump, an air source, a water pump, a pressure gauge and a pressure control valve, wherein the first container is connected with the second container through the vacuum pump;
the vacuum pump is respectively communicated with the first container and the second container, and the gas source is respectively communicated with the first container and the second container;
the water pump is arranged between the first container and the second container and is respectively communicated with the first container and the second container, and the water pump is used for enabling liquid to flow back and forth between the first container and the second container;
the pressure meter and the pressure control valve are simultaneously installed on the first container or the second container, and the first container is provided with an installation flange for installing an air blowing type liquid level meter to be calibrated;
the first container also has at least one of the following features: be provided with and be used for measuring the standard level gauge of the inside liquid level of first container, make by transparent material and be provided with the first scale that is used for showing the liquid level, be provided with the first connecting pipe of first container intercommunication just first connecting pipe is made by transparent material just be provided with the second scale that is used for showing the liquid level on the first connecting pipe just the cross-sectional area of first connecting pipe is less than the cross-sectional area of first container.
Optionally, the calibration device includes a first three-way valve, where the first three-way valve includes a first port, a second port, and a third port, and the first port of the first three-way valve is communicated with the second port of the first three-way valve or the third port of the first three-way valve;
and a first port of the first three-way valve is respectively communicated with the first container and the second container, a second port of the first three-way valve is communicated with the vacuum pump, and a third port of the first three-way valve is communicated with the gas source.
Optionally, be provided with on the first container with the first connecting pipe of first container intercommunication just first connecting pipe is made by transparent material just be provided with the second scale that is used for showing the liquid level on the first connecting pipe, be provided with the float that is used for confirming the liquid level in the first connecting pipe.
Optionally, the water pump is a one-way pump, and the calibration device further includes a second three-way valve and a third three-way valve;
the second and third three-way valves each include a first port in communication with the second port of the second three-way valve or the third port of the second three-way valve, and a second port in communication with the second port of the third three-way valve or the third port of the third three-way valve;
the water pump is a one-way pump and comprises an input port and an output port, a first port of the second three-way valve is communicated with the input port of the water pump, a second port of the second three-way valve is communicated with the first container, and a third port of the second three-way valve is communicated with the second container;
and a first port of the third three-way valve is communicated with an output port of the water pump, a second port of the third three-way valve is communicated with the first container, and a third port of the third three-way valve is communicated with the second container.
Optionally, the calibration apparatus further includes a first valve, a second valve, a third valve and a fourth valve, the first valve is disposed between the first container and the second port of the second three-way valve, the second valve is disposed between the second container and the third port of the second three-way valve, the third valve is disposed between the first container and the second port of the third three-way valve, and the fourth valve is disposed between the second container and the third port of the third three-way valve.
Optionally, the first valve and the third valve are respectively communicated with the bottom of the first container, and the second valve and the fourth valve are respectively communicated with the bottom of the first container.
Optionally, the pressure gauge and the pressure control valve are disposed at the same time on the top of the first container or the top of the second container.
Optionally, the second container further has at least one of the following features: be provided with and be used for measuring the standard level gauge of the inside liquid level of second container, make by transparent material and be provided with the third scale that is used for showing the liquid level, be provided with the second of second container intercommunication is communicating pipe just the second is made by transparent material communicating pipe just the second is provided with the third scale that is used for showing the liquid level communicating pipe.
Optionally, the first container and the second container have equal volumes.
The invention also provides a calibration method of the air blowing type liquid level meter, the calibration method calibrates the air blowing type liquid level meter to be calibrated by the calibration device of the air blowing type liquid level meter, and the calibration method comprises the following steps:
s1, mounting the air blowing type liquid level meter to be calibrated on a mounting flange of the first container;
s2, adjusting the first container and the second container to be in a vacuum or positive pressure state corresponding to the actual working condition through the vacuum pump or the air source according to the actual working condition of the air blowing type liquid level meter to be calibrated;
and S3, calibrating the air blowing type liquid level meter to be calibrated according to the standard liquid level meter, the liquid level displayed by the first scale or the liquid level displayed by the second scale and the display liquid level of the air blowing type liquid level meter to be calibrated in the process of inputting and/or outputting the liquid into and/or from the first container.
According to the calibration device and the calibration method of the air blowing type liquid level meter, provided by the invention, the pressure in the first container and the pressure in the second container are adjusted to be the pressure values corresponding to the actual working conditions according to the actual application working conditions of the air blowing type liquid level meter to be calibrated, then the air blowing type liquid level meter to be calibrated is calibrated according to the liquid level displayed by the standard liquid level meter or the second scale and the display liquid level of the air blowing type liquid level meter to be calibrated in the process of inputting and/or outputting the liquid into the first container, and the zero scale position of the air blowing type liquid level meter to be calibrated does not drift any more under the actual working conditions, so that the accuracy of liquid level measurement is improved. The actual working condition may be a vacuum working condition or a positive pressure working condition.
Drawings
FIG. 1 is a schematic diagram of a calibration device of an air-blown liquid level meter in the prior art;
FIG. 2 is a schematic structural diagram of a calibration apparatus of an air-blowing liquid level meter according to an embodiment of the present invention;
fig. 3 is a flowchart of a calibration method of an air-blowing liquid level meter according to an embodiment of the present invention.
[ reference numerals are described below ]:
the device comprises a container-1, a mounting flange 2 and a scale-3;
the device comprises a first container-11, a second container-12, a vacuum pump-13, an air source-14, a water pump-15, a pressure gauge-16, a pressure control valve-17, a blowing type liquid level meter-18 to be calibrated, a mounting flange-19, a first communication pipe-20, a first three-way valve-21, a second three-way valve-22, a third three-way valve-23, a first valve-24, a second valve-25, a third valve-26, a fourth valve-27 and a second communication pipe-28.
Detailed Description
In order to make the objects, advantages and features of the present invention clearer, the following describes a calibration apparatus and a calibration method of an air-blowing type liquid level meter in further detail with reference to the accompanying drawings. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. The terms "first," "second," and "third," etc. are used for convenience of reference and add to the qualifiers.
As shown in fig. 2, the present embodiment provides a calibration apparatus for an air-blowing liquid level meter, which includes a first container 11, a second container 12, a vacuum pump 13, an air source 14, a water pump 15, a pressure gauge 16 and a pressure control valve 17; the vacuum pump 13 is respectively communicated with the first container 11 and the second container 12, and the gas source 14 is respectively communicated with the first container 11 and the second container 12; the water pump 15 is arranged between the first container 11 and the second container 12 and is respectively communicated with the first container 11 and the second container 12, and the water pump 15 is used for enabling liquid to flow back and forth between the first container 11 and the second container 12; the pressure gauge 16 and the pressure control valve 17 are simultaneously installed on the first container 11 or the second container 12, and the first container 11 is provided with a mounting flange 19 for installing an air blowing type liquid level meter 18 to be calibrated; the first container 11 also has at least one of the following features: be provided with and be used for measuring the standard level gauge of 11 inside liquid levels of first container, make by transparent material and be provided with the first scale that is used for showing the liquid level, be provided with the first connecting pipe 20 of 11 intercommunications of first container just first connecting pipe 20 is made by transparent material just be provided with the second scale that is used for showing the liquid level on the first connecting pipe 20 just the cross-sectional area of first connecting pipe 20 is less than the cross-sectional area of first container 11.
The vacuum pump 13 and the gas source 14 may be respectively provided with two pipelines for connecting the first container 11 and the second container 12, or may share two pipelines for connecting the first container 11 and the second container 12 by using a three-way valve. The gas source 14 may be nitrogen or an inert gas. The water pump 15 may be a bidirectional pump (the flow direction may be switched in two directions) or a unidirectional pump (only one flow direction), and when the water pump 15 is a bidirectional pump, only one pipeline needs to be arranged between the first container 11 and the second container 12; when the water pump 15 is a one-way pump, two parallel pipelines may be provided between the first container 11 and the second container 12, and each pipeline is provided with a one-way pump, or two three-way valves and a one-way pump may be used as shown in fig. 2. The standard liquid level meter is a liquid level meter which has higher precision than that of the air blowing type liquid level meter 18 to be calibrated and has measurement precision not influenced by the pressure in the container, and can be a float type liquid level meter, a radar liquid level meter or an ultrasonic liquid level meter and the like. The first container 11 and the second container 12 may be made of a material resistant to high pressure, such as steel, transparent polycarbonate, or transparent quartz. The pressure gauge 16 may detect the pressure inside the first container 11. The pressure control valve 17 can regulate the pressure in the first container 11 to a fixed value. Since the first container 11 and the first container 12 are in communication, the pressure inside the first container 11 is equal to the pressure inside the first container 12; the pressure gauge 16 and the pressure control valve 17 may be installed on the first container 11 or the second container 12 at the same time. When the first container 11 and the first communication pipe 20 are hollow cylinders, the fact that the cross-sectional area of the first communication pipe 20 is smaller than the cross-sectional area of the first container 11 means that the diameter of the first communication pipe 20 is smaller than the diameter of the first container 11 is designed so that the first container 11 can be made of steel, and the first communication pipe 20 can be made of transparent material, so that the pressure resistance of the first container 11 can be improved.
The calibration device of air blowing type liquid level meter that this embodiment provided can be according to the practical application operating mode of the air blowing type liquid level meter 18 of waiting to calibrate, adjust the pressure in first container 11 and the second container 12 into the pressure value that operating mode corresponds earlier, then in the in-process of liquid input and/or output first container 11, according to the liquid level that standard level meter or second scale show and the air blowing type liquid level meter 18 of waiting to calibrate shows the liquid level, treat the air blowing type liquid level meter 18 of calibrating and calibrate, the air blowing type liquid level meter after so demarcating is zero scale position no longer drift under operating mode to improve level measurement's accuracy. The actual working condition may be a vacuum working condition or a positive pressure working condition.
In calibrating the air-blown level gauge, calibration is usually performed during the raising and lowering of the liquid level in the first container 11, respectively, to improve the accuracy of the calibration.
Optionally, as shown in fig. 2, the calibration device includes a first three-way valve 21, where the first three-way valve 21 includes a first port, a second port, and a third port, and the first port of the first three-way valve 21 is communicated with the second port of the first three-way valve 21 or the third port of the first three-way valve 21; a first port of the first three-way valve 21 is communicated with the first container 11 and the second container 12, respectively, a second port of the first three-way valve 21 is communicated with the vacuum pump 13, and a third port of the first three-way valve 21 is communicated with the gas source 14. The three-way valve can reduce a two-way valve and simplify the pipeline.
Optionally, as shown in fig. 2, a first communication pipe 20 communicated with the first container 11 is disposed on the first container 11, the first communication pipe 20 is made of a transparent material, a second scale for displaying a liquid level is disposed on the first communication pipe 20, and a float for confirming the liquid level is disposed in the first communication pipe 20. The provision of a float facilitates reading of the liquid level in the first container 11.
Optionally, as shown in fig. 2, the water pump 15 is a one-way pump, and the calibration device further includes a second three-way valve 22 and a third three-way valve 23; the second and third three- way valves 22 and 23 each include a first port, a second port, and a third port, the first port of the second three-way valve 22 being in communication with the second port of the second three-way valve 22 or the third port of the second three-way valve 22, the first port of the third three-way valve 23 being in communication with the second port of the third three-way valve 23 or the third port of the third three-way valve 23; the water pump 15 is a one-way pump and includes an input port and an output port, a first port of the second three-way valve 22 is communicated with the input port of the water pump 15, a second port of the second three-way valve 22 is communicated with the first container 11, and a third port of the second three-way valve 22 is communicated with the second container 12; a first port of the third three-way valve 23 communicates with the output port of the water pump 15, a second port of the third three-way valve 23 communicates with the first tank 11, and a third port of the third three-way valve 23 communicates with the second tank 12. The second three-way valve 22 and the third three-way valve 23 can realize the back-and-forth flow of the liquid between the first container 11 and the second container 12 by only arranging one-way pump, thereby saving the cost.
Optionally, as shown in fig. 2, the calibration apparatus further includes a first valve 24, a second valve 25, a third valve 26, and a fourth valve 27, where the first valve 24 is disposed between the first container 11 and the second port of the second three-way valve 22, the second valve 25 is disposed between the second container 12 and the third port of the second three-way valve 22, the third valve 26 is disposed between the first container 11 and the second port of the third three-way valve 23, and the fourth valve 27 is disposed between the second container 12 and the third port of the third three-way valve 23. The first valve 24, the second valve 25, the third valve 26 and the fourth valve 27 may be ball valves or other valves having an opening and closing function. The arrangement of the first valve 24, the second valve 25, the third valve 26 and the fourth valve 27 can control each branch to be in an open state or a closed state, so that the safety of the calibration device is improved.
Alternatively, as shown in fig. 2, the first valve 24 and the third valve 26 are respectively communicated with the bottom of the first container 11, and the second valve 25 and the fourth valve 27 are respectively communicated with the bottom of the first container. This arrangement facilitates the flow of liquid between the first container 11 and the second container 12.
Alternatively, as shown in fig. 2, the pressure gauge 16 and the pressure control valve 17 are disposed at the top of the first container 11 or the top of the second container 12 at the same time. The arrangement can prevent liquid from directly contacting the pressure gauge 16 and the pressure control valve 17, and the service life of the pressure gauge 16 and the pressure control valve 17 is prolonged.
Optionally, as shown in fig. 2, the second container 12 further has at least one of the following features: be provided with and be used for measuring the standard level gauge of the inside liquid level of second container 12, make by transparent material and be provided with the third scale that is used for showing the liquid level, be provided with the second of second container 12 intercommunication is communicating pipe 28 just the second is communicating pipe 28 is made by transparent material just be provided with the third scale that is used for showing the liquid level on the second is communicating pipe 28. This arrangement allows reading the level of the liquid in the second container 12, which level of the liquid in the second container 12 can be used as a reference value for the level of the liquid in the first container 11, since the total height values corresponding to the liquids in the first container 11 and the second container 12 are constant.
Alternatively, as shown in fig. 2, the first container 11 and the second container 12 have equal volumes. This facilitates the manufacture of the calibration device and prevents the problem of one container being too small, which could lead to spillage of liquid from a smaller container.
Based on the same technical concept as the calibration device of the air-blowing type liquid level meter, the embodiment further provides a calibration method of the air-blowing type liquid level meter, the calibration method utilizes the calibration device to calibrate the air-blowing type liquid level meter 18 to be calibrated, as shown in fig. 2 and 3, the calibration method comprises the following steps:
s1, mounting the air blowing type liquid level meter 18 to be calibrated on the mounting flange 19 of the first container 11;
s2, adjusting the first container 11 and the second container 12 to be in a vacuum or positive pressure state corresponding to the actual working condition through the vacuum pump 13 or the air source 14 according to the actual working condition of the air blowing type liquid level meter 18 to be calibrated;
and S3, calibrating the air blowing type liquid level meter 18 to be calibrated according to the standard liquid level meter, the liquid level displayed by the first scale or the liquid level displayed by the second scale and the liquid level displayed by the air blowing type liquid level meter 18 to be calibrated in the process of inputting and/or outputting the liquid into and/or from the first container 11.
According to the calibration method of the air blowing type liquid level meter provided by the embodiment, the pressure in the first container 11 and the pressure in the second container 12 can be adjusted to the pressure value corresponding to the actual working condition according to the actual application working condition of the air blowing type liquid level meter 18 to be calibrated, then the air blowing type liquid level meter 18 to be calibrated is calibrated according to the liquid level displayed by the standard liquid level meter or the second scale and the liquid level displayed by the air blowing type liquid level meter 18 to be calibrated in the process of inputting and/or outputting the liquid into the first container 11, and the zero scale position of the air blowing type liquid level meter after calibration does not drift any more under the actual working condition, so that the accuracy of liquid level measurement is improved.
As shown in fig. 2, when the calibration apparatus further includes a first valve 24, a second valve 25, a third valve 26 and a fourth valve 27, the calibration method includes the following steps:
step one, mounting the air blowing type liquid level meter 18 to be calibrated on a mounting flange 19 of the first container 11;
step two, closing the first valve 24, the second valve 25, the third valve 26 and the fourth valve 27;
step three, according to the actual working condition of the air blowing type liquid level meter 18 to be calibrated, the first container 11 and the second container 12 are adjusted to be in a vacuum or positive pressure state corresponding to the actual working condition through the vacuum pump 13 or the air source 14;
opening the second valve 25 and the third valve 26, turning the second three-way valve 22 to a right position, turning the third three-way valve 23 to a left position, and inputting the liquid in the second container 12 into the first container 11 through the second valve 25, the second three-way valve 22, the water pump 15, the third three-way valve 23 and the third valve 26;
step five, calibrating the air blowing type liquid level meter 18 to be calibrated according to the standard liquid level meter, the liquid level displayed by the first scale or the liquid level displayed by the second scale and the liquid level displayed by the air blowing type liquid level meter 18 to be calibrated in the process of inputting the liquid into the first container 11;
sixthly, closing the second valve 25 and the third valve 26, opening the first valve 24 and the fourth valve 27, turning the second three-way valve 22 to a left position, turning the third three-way valve 23 to a right position, and inputting the liquid in the first container 11 into the second container 12 through the first valve 24, the second three-way valve 22, the water pump 15, the third three-way valve 23 and the fourth valve 27;
and seventhly, calibrating the air blowing type liquid level meter 18 to be calibrated according to the standard liquid level meter, the liquid level displayed by the first scale or the liquid level displayed by the second scale and the liquid level displayed by the air blowing type liquid level meter 18 to be calibrated in the process of outputting the liquid to the first container 11.
According to the calibration method of the air blowing type liquid level meter provided by the embodiment, the pressure in the first container 11 and the pressure in the second container 12 can be adjusted to the pressure value corresponding to the actual working condition according to the actual application working condition of the air blowing type liquid level meter 18 to be calibrated, then the air blowing type liquid level meter 18 to be calibrated is calibrated according to the liquid level displayed by the standard liquid level meter or the second scale and the liquid level displayed by the air blowing type liquid level meter 18 to be calibrated in the process of inputting and/or outputting the liquid into the first container 11, and the zero scale position of the air blowing type liquid level meter after calibration does not drift any more under the actual working condition, so that the accuracy of liquid level measurement is improved.
In summary, according to the calibration device and the calibration method for the air blowing type liquid level meter provided by the invention, according to the actual application working condition of the air blowing type liquid level meter 18 to be calibrated, the pressure in the first container 11 and the pressure in the second container 12 are firstly adjusted to the pressure values corresponding to the actual working condition, then in the process of inputting and/or outputting the liquid into the first container 11, the air blowing type liquid level meter 18 to be calibrated is calibrated according to the liquid level displayed by the standard liquid level meter or the second scale and the liquid level displayed by the air blowing type liquid level meter 18 to be calibrated, so that the zero scale position of the air blowing type liquid level meter after calibration does not drift any more under the actual working condition, and the accuracy of liquid level measurement is improved.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the present invention.
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011387739.4A CN112378499A (en) | 2020-12-01 | 2020-12-01 | Calibration device and calibration method for air blowing type liquid level meter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011387739.4A CN112378499A (en) | 2020-12-01 | 2020-12-01 | Calibration device and calibration method for air blowing type liquid level meter |
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| CN112378499A true CN112378499A (en) | 2021-02-19 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106989801A (en) * | 2017-04-14 | 2017-07-28 | 张家港市检验检测中心 | Two-way self-circulation type liquid level meter detecting device |
| CN207147598U (en) * | 2017-05-27 | 2018-03-27 | 四川锦美环保股份有限公司 | A kind of device of bubbling liquid-level meter calibration instrument zero point |
| CN209117119U (en) * | 2018-12-11 | 2019-07-16 | 上海孚凌自动化控制系统有限公司 | A kind of two-way blowing type liquid level meter |
| CN110319909A (en) * | 2019-07-30 | 2019-10-11 | 高梓翔 | A kind of magnetic float level indicator calibrating installation |
| CN213632343U (en) * | 2020-12-01 | 2021-07-06 | 上海孚凌自动化控制系统股份有限公司 | Calibration device of air blowing type liquid level meter |
-
2020
- 2020-12-01 CN CN202011387739.4A patent/CN112378499A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106989801A (en) * | 2017-04-14 | 2017-07-28 | 张家港市检验检测中心 | Two-way self-circulation type liquid level meter detecting device |
| CN207147598U (en) * | 2017-05-27 | 2018-03-27 | 四川锦美环保股份有限公司 | A kind of device of bubbling liquid-level meter calibration instrument zero point |
| CN209117119U (en) * | 2018-12-11 | 2019-07-16 | 上海孚凌自动化控制系统有限公司 | A kind of two-way blowing type liquid level meter |
| CN110319909A (en) * | 2019-07-30 | 2019-10-11 | 高梓翔 | A kind of magnetic float level indicator calibrating installation |
| CN213632343U (en) * | 2020-12-01 | 2021-07-06 | 上海孚凌自动化控制系统股份有限公司 | Calibration device of air blowing type liquid level meter |
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