CN106289454A - Liquidometer gage and apply its liquidometer calibration steps - Google Patents
Liquidometer gage and apply its liquidometer calibration steps Download PDFInfo
- Publication number
- CN106289454A CN106289454A CN201610679301.0A CN201610679301A CN106289454A CN 106289454 A CN106289454 A CN 106289454A CN 201610679301 A CN201610679301 A CN 201610679301A CN 106289454 A CN106289454 A CN 106289454A
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- liquidometer
- liquid level
- chi
- gage
- container
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- 239000007788 liquid Substances 0.000 claims abstract description 97
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 230000003993 interaction Effects 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 2
- 238000012800 visualization Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 9
- 239000013049 sediment Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 3
- 241000208340 Araliaceae Species 0.000 description 2
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 2
- 235000003140 Panax quinquefolius Nutrition 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 235000008434 ginseng Nutrition 0.000 description 2
- 230000036461 convulsion Effects 0.000 description 1
- 238000001739 density measurement Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention discloses a kind of liquidometer gage and apply its liquidometer calibration steps.Wherein, a kind of liquidometer gage includes that ribbon, chi hammer, ribbon control device, human-computer interaction device, survey crew and ribbon can be made to control device and can control lower chi speed in time, the problem that the level gauging data simultaneously avoiding the factors such as the foundation settlement of container bottom, container deformation, container bottom sediment pile to cause are forbidden；A kind of liquidometer calibration steps is fixing liquid level meter calibrating method based on described liquidometer gage, under the different liquid levels of same container, utilize fixing liquidometer and described liquid level measuring ruler that the liquid level of container is carried out double measurement respectively, error formula is utilized to calculate error, need not obtain in advance the reference altitude of container, eliminate the inaccurate impact on measurement result of reference altitude, reached the target of the fixing liquidometer error of calibration, measurement work efficiency is greatly improved.
Description
Technical field
The present invention relates to technical field of liquid level measurement, a kind of liquidometer gage and apply its liquidometer to calibrate
Method, the liquidometer gage of a kind of oil containers and apply its liquidometer calibration steps.
Background technology
The level gauging of container generally uses fixing liquidometer and two kinds of level measuring methods of Portable metering device, its
In, Portable metering device has liquidometer gage (oil dipstick) and liquid level density comprehensive tester etc..Fixing liquid level meter calibrating side
Method generally uses the fixing liquidometer of portable liquid level measuring arrangement contrast to calculate error, and this fixing liquidometer error is to analogy
Method uses the liquid level outage method away from container top or the liquid level real supreme people's court away from container bottom to carry out the calculating of error.Traditional liquid
Position measuring ruler (oil dipstick) is hammered into shape two parts by ribbon and chi and is formed, and enters container at container top during measurement under vertical for chi hammer,
Whether touch liquid level or container bottom by human perception judgment rule hammer, then read the lower chi degree of depth and determine level value；Liquid
Bit density comprehensive tester structure, principle are essentially identical with liquidometer gage (oil dipstick), also have liquid density measurement, temperature
Measure and the buzzing warning function touching liquid level hammered into shape by chi.
Traditional liquidometer gage (oil dipstick) and liquid level density comprehensive tester are disadvantageous in that: when chi hammer is close
When liquid level or container bottom, survey crew cannot be prejudged chi and hammer the distance of liquid level or container bottom, survey crew into shape
Uncontrollable lower chi speed；When chi hammer touches liquid level or container bottom also at lower chi, measurement so can be caused inaccurate.Gu
Determine liquidometer error control methods to be disadvantageous in that: the liquidometer gage (oil dipstick) of use and liquid level density integration test
When tank fill level measured by instrument, outage method must be obtained ahead of time the reference altitude of container top, and real supreme people's court must the amount of obtaining container in advance
The reference altitude of bottom, due to factors such as foundation settlement, container deformation, container bottom sediment piles after container operation for many years, ginseng
Examine height it may happen that great changes, cause liquidometer calibration inaccurate.
Summary of the invention
In view of this, the present invention provides a kind of liquidometer gage and applies its liquidometer calibration steps, described to solve
Traditional liquidometer gage (oil dipstick) and liquid level density comprehensive tester cannot be prejudged chi because of survey crew and hammer liquid level into shape
Or the distance of container bottom, the most uncontrollable lower chi speed causes the inaccurate problem of measurement；And because container is due to base
What the factors such as plinth sedimentation, container body deformation, container bottom sediment pile caused causes liquidometer to calibrate inaccurate problem.
First aspect, it is provided that a kind of liquidometer gage, the measurement of liquid level in container, described liquidometer gage bag
Include:
Ribbon, with tape, with scale in described tape, can read lower chi length in institute's tape；
Chi is hammered into shape, and the tape end entering measurement container with described ribbon is connected, it is ensured that described tape is by weight traction freely
Ground falls；
Ribbon controls device, is connected with ribbon, for controlling the lower chi speed of described steel pipe chi and lower chi length；
Human-computer interaction device, is connected with described chi hammer, for showing that chi hammers liquid level or the range information of container bottom and liquid into shape
Face or the image information of container bottom.
Preferably, described chi hammer includes:
Data acquisition unit, hammers liquid level or the range information of container bottom and liquid level or container bottom into shape for gathering described chi
The image information in portion, feeds back to described range information described ribbon respectively and controls device, by described range information and described
Image information is transferred to human-computer interaction device；
Chi hammer shell, for waterproof sealing housing, with scale on chi hammer shell, described data acquisition unit is arranged on described chi hammer
In shell, described chi hammer shell reaches safety anti-explosive and waterproof requirement.
Preferably, described ribbon is 1mm with the minimum scale of described chi hammer shell, and described liquidometer gage also wraps
Include:
Support, is used for fixing described liquidometer gage.
Preferably, described data acquisition unit also includes:
Liquid level distance detector is ultrasonic sensor, hammers the distance of liquid level or container bottom into shape for gathering described chi,
Described ultrasonic sensor dip stick hammers the resolution of the distance of liquid level or container bottom into shape less than 1mm；
Liquid level and container image detector are the photographic head of automatic light source, for gathering the image letter of liquid level or container bottom
Breath；
Wherein, the automatic light source of described photographic head can penetrate transparent or semitransparent liquid.
Human-computer interaction device, including:
Display device, is connected with described data acquisition unit, the described range information that described data acquisition unit will collect
Being transferred to described display device with described image information, described display device shows described range information and described image letter in real time
Breath；
Instruction inputting device, controls device with ribbon and is connected, can input control instruction according to the actual requirements.
Preferably, described human-computer interaction device also includes:
Alarm device, when the distance that chi hammers liquid level or container bottom into shape is 1～50mm, described alarm device enters
Row is reported to the police, and is used for pointing out chi speed under survey crew Artificial Control.
Preferably, described ribbon controls the built-in automatic control unit of device, is connected with ribbon, can automatically control described
The lower chi speed of steel pipe chi and lower chi length；
Wherein, automatic control unit can arrive according to described data acquisition unit described range information and described image information with
Set-point compares computing, exports control instruction, described control instruction can automatically control described steel pipe chi lower chi speed and
Lower chi length.
Second aspect, it is provided that a kind of liquidometer calibration steps, including liquidometer gage as above:
Utilize fixing liquidometer and described liquid level measuring ruler that liquid level is measured respectively, utilize fixing liquidometer measured value and
The fixing liquidometer of measured value calibration of described liquid level measuring ruler.
Preferably, described liquidometer calibration steps, including: under the different liquid levels of same container, utilize fixing liquidometer
With described liquid level measuring ruler, the liquid level of container is carried out double measurement respectively.Fixing liquidometer that record is measured for the first time and described
Liquid level measuring ruler level value is respectively h1, H1；Change liquid level, utilize fixing liquidometer and described liquid level measuring ruler to container
Liquid level carry out second time measure, record second time measure fixing liquidometer and described liquid level measuring ruler level value be respectively
h2、H2；Utilize the fixing liquidometer of error formula Δ=(h2-h1)-(H2-H1) calibration.
There is advantages that
In described liquidometer gage, by chi hammer gather chi hammer into shape liquid level or the range information of container bottom and liquid level or
The image information of container bottom, feeds back to described range information ribbon respectively and controls device, range information and image is believed
Breath is transferred to human-computer interaction device；Human-computer interaction device shows range information and the image information of chi hammer collection in real time, measures people
Member and ribbon control device can control lower chi speed in time, and the image information simultaneously shown by human-computer interaction device is permissible
Avoid the level gauging data that the foundation settlement of container bottom, container deformation, the factor such as sediment pile of container bottom cause
Inaccurate problem.
Described liquidometer calibration steps need not measure the container measurement mouth reference altitude of container top, the ginseng of container bottom
The problem examining height, eliminates the inaccurate impact on fixing liquid level meter calibrating of reference altitude, measurement has also been significantly increased
Work efficiency.
Accompanying drawing explanation
By below with reference to the accompanying drawing description to the embodiment of the present invention, above-mentioned and other purpose of the present invention, feature and
Advantage is apparent, in legend:
Fig. 1 is the liquidometer gage schematic diagram of the present invention；
Fig. 2 is the liquidometer calibration schematic diagram of the embodiment of the present invention；
Fig. 3 is the liquidometer calibration schematic diagram of another embodiment of the present invention.
Detailed description of the invention
Below based on example, present invention is described, but what deserves to be explained is, the present invention is not limited to these and implements
Example.In below the details of the present invention being described, detailed describe some specific detail sections.But, for the most detailed
The part described, those skilled in the art are appreciated that the present invention the most completely.
Additionally, it should be understood by one skilled in the art that provided accompanying drawing is simply for the explanation purpose of the present invention, spy
Seeking peace advantage, accompanying drawing is not actual being drawn to scale.
Meanwhile, unless the context clearly requires otherwise, otherwise " including ", " comprising " in entire disclosure and claims etc.
Similar word should be construed to the implication that comprises rather than exclusive or exhaustive implication；It is to say, be " including but not limited to "
Implication.
Fig. 1 is the liquidometer gage schematic diagram of the present invention.As it is shown in figure 1, liquidometer gage includes ribbon 1, ribbon
Control device 2, chi hammer 3, human-computer interaction device 4 and support 5 and tape 6；Chi hammer 3 includes chi hammer shell 31 and data acquisition unit
32, chi hammer shell 31 is waterproof sealing housing, and data acquisition unit 32 includes liquid level and container image detector 32a and liquid level
Distance detector 32b, human-computer interaction device 4 includes display device 41, instruction inputting device 42 and alarm device 43.
Wherein, liquid level and container image detector 32a are the photographic head of automatic light source, liquid level distance detector 32b
For ultrasonic sensor.
Ribbon 1 support 5 is fixed on the measurement mouth of container, and ribbon 1 is with tape 6, and tape 6 has scale, tape 6 to show
Show lower chi length；Chi hammer shell 31 enters the tape end of measurement container and is connected with tape 6；Ultrasonic sensor 32b is used for adopting
Collecting described chi hammer 3 and arrive liquid level or the range information of container bottom, liquid level and container image detector 51 are used for gathering liquid level
Or the image information of container bottom, described range information and described image information are fed back in display device 41；Survey crew
Described range information and described image information can be observed according to display device 41, control steel pipe chi 1 lower chi speed and under
Chi length.When chi hammer 31 contact liquid level or container bottom, read the lower chi degree of depth and the quarter of chi hammer shell 31 of described tape 6
Degree, adds up the lower chi degree of depth of tape 6 and the scale of chi hammer shell 31 as being surveyed level value, completes level gauging.
Wherein, liquid level and container image detector 32a and liquid level distance detector 32b are all arranged on chi hammer shell
In 31, chi hammer shell 31 is the shell with waterproof sealing, and the shell of this waterproof sealing need to reach safety anti-explosive and waterproof
Requirement；Chi hammer 3 has certain weight, and chi hammer shell 31 also has scale.
Liquid level and container image detector 32a can penetrate transparent or semitransparent liquid.It is preferred that liquid level
Distance detector 32b dip stick hammer 3 is less than 1mm to the resolution of liquid level or container bottom distance.
Further, the liquidometer gage of the present invention has ribbon control device 2；Detected by liquid level and container image
The range information of chi hammer 3 to liquid level or container bottom is fed back to ribbon control by device 32a and liquid level distance detector 32b
In device 2 processed, by comparing judgement with parameter set in advance, ribbon controls device 2 and exports control command, controls steel pipe
The lower chi speed of chi 1 and lower chi length.
Further, human-computer interaction device 4 includes alarm device 43, when described chi hammer 3 is to liquid level or container
Bottom distance 1～50mm time, alarm device 43 is reported to the police, and is used for pointing out chi speed under survey crew Artificial Control,
One or more during alarm device 43 can flash based on buzzer, voice or lamp are reported to the police；Instruction inputting device
42, with ribbon control device be connected, control instruction can be inputted according to the actual requirements, can be used for lower chi length, lower chi speed,
The input of the control instructions such as jerk.
It addition, liquid level and container image detector 32a can detect whether container bottom has deposit or junk
The problems such as accumulation and container body deformation, have deposit or junk accumulation and container body deformation to ask if detecting container bottom
Topic, can avoid the inaccurate problem of measurement data by changing the position of liquidometer gage.
Fig. 2 is the liquidometer calibration schematic diagram of the embodiment of the present invention, as in figure 2 it is shown, pacify on a measurement mouth of container A
Equipped with fixed liquidometer B, the liquidometer gage C of the present invention is arranged on another simultaneously and measures mouth；First liquid level D's
Situation, the level value that fixing liquidometer B measures is h1, and the level value that liquidometer gage C records is H1；By changing level value,
After level stability, i.e. the situation of second liquid level E, the level value that fixing liquidometer B measures is h2, and liquidometer gage C records
Level value be H2；Utilize error formula Δ=(h2-h1)-(H2-H1) to calculate the error amount of fixing liquidometer B, reach calibration solid
Determine the purpose of liquidometer error.
Fig. 3 is the liquidometer calibration schematic diagram of another embodiment of the present invention；As it is shown on figure 3, fixed liquidometer B and basis
The same measurement mouth that the liquidometer gage C of invention is arranged in container A, ensures the liquid of fixed liquidometer B and the present invention simultaneously
It is separate that position measuring ruler C measures process；In the situation of first liquid level F, the level value that fixing liquidometer B measures is h11, liquid
The level value that position measuring ruler C records is H11；By changing level value, after level stability, the i.e. situation of second liquid level G, Gu
The level value determining liquidometer B measurement is h21, and the level value that liquidometer gage C records is H21；Utilize error formula Δ=(h21-
H11)-(H21-H11) calculate the error amount of fixing liquidometer B, reach to calibrate the purpose of fixing liquidometer error.
Embodiment described above only expresses embodiments of the present invention, and it describes more concrete and detailed, but can not
Therefore it is construed as limiting the scope of the patent.It should be pointed out that, to those skilled in the art, not
On the premise of departing from the present invention, it is also possible to making some deformation, equal replacement, improvement etc., these broadly fall into the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. a liquidometer gage, the measurement of liquid level in container, it is characterised in that including:
Ribbon, described ribbon is with tape, with scale in described tape；
Chi is hammered into shape, and the tape end entering measurement container with described ribbon is connected；
Ribbon controls device, is connected with ribbon, for controlling the lower chi speed of described steel pipe chi and lower chi length；
Human-computer interaction device, controls device with described chi hammer and described ribbon and is connected respectively, be used for showing that liquid hammered into shape by described chi
Face or the range information of container bottom and liquid level or the image information of container bottom, for described range information and described
Visualization display, alarm and the input of control command of image information.
Liquidometer gage the most according to claim 1, it is characterised in that described chi hammer includes:
Data acquisition unit, hammers liquid level or the range information of container bottom and liquid level or container bottom into shape for gathering described chi
The image information in portion, feeds back to described range information described ribbon respectively and controls device, by described range information and described
Image information is transferred to human-computer interaction device；
Chi hammer shell, for waterproof sealing housing, chi is hammered into shape on shell with scale；
Wherein, in described data acquisition unit is arranged on described chi hammer shell.
Liquidometer gage the most according to claim 1, it is characterised in that described liquidometer gage also includes:
Support, is used for fixing described liquidometer gage.
Liquidometer gage the most according to claim 1, it is characterised in that described ribbon controls device and includes:
Automatic control unit, can automatically control the lower chi speed of described steel pipe chi and lower chi length.
Liquidometer gage the most according to claim 1, it is characterised in that described data acquisition unit includes:
Liquid level distance detector, hammers the distance of liquid level or container bottom into shape for gathering described chi；
Liquid level and container image detector, for gathering the image information of liquid level or container bottom.
Liquidometer gage the most according to claim 1, it is characterised in that described liquid level distance detector includes:
Ultrasonic sensor, hammers the distance of liquid level or container bottom into shape for gathering described chi, and described ultrasonic sensor is surveyed
Gage hammers the resolution of the distance of liquid level or container bottom into shape less than 1mm.
Liquidometer gage the most according to claim 1, it is characterised in that described liquid level and container image detector bag
Include:
The photographic head of automatic light source, for gathering the image information of liquid level or container bottom, the automatic light source of described photographic head can
To penetrate transparent or semitransparent liquid.
Liquidometer gage the most according to claim 1, it is characterised in that described human-computer interaction device includes:
Display device, is connected with described data acquisition unit, described data acquisition unit by the described range information that collects and
Described image information is transferred to described display device, and described display device shows the number that described data acquisition unit gathers in real time
According to；
Instruction inputting device, controls device with described ribbon and carries out communication, can input control instruction according to the actual requirements.
Liquidometer gage the most according to claim 1, it is characterised in that described human-computer interaction device also includes:
Alarm device, hammering the distance of liquid level or container bottom into shape when chi is 1～50mm to report to the police, and is used for pointing out survey
Chi speed under amount personnel's Artificial Control.
10. a liquidometer calibration steps, including the liquidometer gage described in any one of claim 1～9, it is characterised in that
Including:
Under the different liquid levels of same container, utilize fixing liquidometer and described liquid level measuring ruler that the liquid level of container is carried out respectively
Double measurement；Fixing liquidometer and described liquid level measuring ruler level value that record is measured for the first time are respectively h1, H1；Change liquid level
Highly, utilizing fixing liquidometer and described liquid level measuring ruler that the liquid level of container carries out second time and measure, record second time is measured
Fixing liquidometer and described liquid level measuring ruler level value be respectively h2, H2；Utilize error formula Δ=(h2-h1)-(H2-H1)
Calibrate described fixing liquidometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610679301.0A CN106289454B (en) | 2016-08-17 | 2016-08-17 | Liquid level meter measuring ruler and liquid level meter calibration method applying same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610679301.0A CN106289454B (en) | 2016-08-17 | 2016-08-17 | Liquid level meter measuring ruler and liquid level meter calibration method applying same |
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| CN106289454A true CN106289454A (en) | 2017-01-04 |
| CN106289454B CN106289454B (en) | 2023-11-03 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107270993A (en) * | 2017-06-30 | 2017-10-20 | 西京学院 | It is a kind of while measuring the device of propellant liquid level and density |
| CN108362462A (en) * | 2018-02-08 | 2018-08-03 | 武汉理工大学 | A kind of slamming experiment falling bodies high precision control device and control method |
| CN111693118A (en) * | 2020-06-24 | 2020-09-22 | 安东仪器仪表检测有限公司 | Calibration method of top-mounted magnetic turn-over plate liquid level meter |
| CN112113526A (en) * | 2020-09-23 | 2020-12-22 | 中国核动力研究设计院 | Resin interface instrument test system and method |
| CN112461337A (en) * | 2020-11-16 | 2021-03-09 | 沈阳新石科技有限公司 | Oil and gas well liquid level instrument detection method |
| CN113758542A (en) * | 2020-06-03 | 2021-12-07 | 中国石油天然气股份有限公司 | Method for comparing and calculating crude oil stabilizing tower and outdoor liquid level meter |
| CN117928694A (en) * | 2024-01-24 | 2024-04-26 | 淮安市计量测试中心 | Reflective liquid level meter verification system and method based on Internet of things |
Families Citing this family (1)
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| DE102023204156A1 (en) | 2023-05-04 | 2024-11-07 | Vega Grieshaber Kg | display device for a sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107270993A (en) * | 2017-06-30 | 2017-10-20 | 西京学院 | It is a kind of while measuring the device of propellant liquid level and density |
| CN108362462A (en) * | 2018-02-08 | 2018-08-03 | 武汉理工大学 | A kind of slamming experiment falling bodies high precision control device and control method |
| CN113758542A (en) * | 2020-06-03 | 2021-12-07 | 中国石油天然气股份有限公司 | Method for comparing and calculating crude oil stabilizing tower and outdoor liquid level meter |
| CN111693118A (en) * | 2020-06-24 | 2020-09-22 | 安东仪器仪表检测有限公司 | Calibration method of top-mounted magnetic turn-over plate liquid level meter |
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| CN117928694A (en) * | 2024-01-24 | 2024-04-26 | 淮安市计量测试中心 | Reflective liquid level meter verification system and method based on Internet of things |
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| Publication number | Publication date |
|---|---|
| CN106289454B (en) | 2023-11-03 |
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Address after: 100007 Oil Mansion, 9 North Avenue, Dongcheng District, Beijing, Dongzhimen Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: DAQING PETROLEUM ADMINISTRATION Co.,Ltd. Address before: 100007 Oil Mansion, 9 North Avenue, Dongcheng District, Beijing, Dongzhimen Applicant before: China National Petroleum Corp. Applicant before: DA QING PETROLEUM ADMINISTRATION BUREAU |
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