CN214096281U - High-pressure angle type water meter mass method calibrating device - Google Patents
High-pressure angle type water meter mass method calibrating device Download PDFInfo
- Publication number
- CN214096281U CN214096281U CN202120341309.2U CN202120341309U CN214096281U CN 214096281 U CN214096281 U CN 214096281U CN 202120341309 U CN202120341309 U CN 202120341309U CN 214096281 U CN214096281 U CN 214096281U
- Authority
- CN
- China
- Prior art keywords
- meter
- water
- standard
- pressure
- pipeline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses a high-pressure angle type water meter mass method calibrating device, which comprises a water tank, a pressure stabilizing container, a commutator, a meter detecting platform and a standard measuring device, wherein a water pump is arranged on a water pipeline between the water tank and the pressure stabilizing container, the outlet end of the pressure stabilizing container is communicated with the meter detecting platform through a degassing filter and a process pipeline, and the outlet side of the meter detecting platform is connected with the commutator through the standard measuring device; the standard measuring device arranged at the outlet side of the commutator adopts an electronic scale, and a weighing container is arranged on the electronic scale; a plurality of meter checking stations are arranged on the meter checking platform; the meter checking stations comprise a plurality of diameter meter checking loops connected in parallel, a plurality of sets of meter checking stations connected in series are arranged on each meter checking loop, and switching valves are arranged on pipelines on the water inlet side and the water outlet side of each set of meter checking stations. The utility model combines the static quality method and the standard meter method, and fills the defect of single detection of the high-pressure water meter detecting device by the volumetric method; the system can calibrate and trace the standard flowmeter used in the device at any time by using a static mass method, and the accuracy and reliability of quantity value transmission are ensured.
Description
Technical Field
The utility model relates to a water gauge calibration equipment specifically is a high pressure angle formula water gauge quality method calibrating installation.
Background
The high-pressure angle water meter is an angle-structure high-pressure water injection meter with the maximum use pressure exceeding 1.0MPa, and is mainly used for metering instruments of underground high-pressure water injection, polymer injection in oil layers and other industrial water in oil field production. With the development of metering technology, more and more high-pressure water meters develop towards the trends of automation, high efficiency and integration, on one hand, the high-pressure water meters are suitable for more and more metering detection services, on the other hand, the high-pressure water meters provide detection efficiency, and the performance of human participation degree is reduced. Therefore, how to ensure the accuracy of the flow measurement of the high-pressure water meter is important.
The water meter calibrating device is a necessary standard metering instrument which is used as a flow transmission standard, a calibrating and a calibrating water meter by a legal metering calibrating mechanism, the water meter manufacturing industry, a tap water company and an industrial and mining enterprise. The traditional angle type water meter calibrating device adopts a volumetric method calibrating mode, the measuring range of the device is small, the calibrating efficiency is low, and the using effect is not ideal. The volumetric method has two problems in actual verification work, namely, the device expansion uncertainty is relatively low, a calibrator of the volumetric method is a three-class standard metal measuring device, the maximum allowable error is +/-0.1%, the expansion uncertainty of the device is 0.1% at most (k is 2), the metering verification of a 0.5-grade detected water meter can be realized, and the volumetric method is lower compared with a mass method; secondly, the verification time is relatively long, the full-scale verification is required due to the principle characteristic of the standard metal measuring device, and the time consumption is longer compared with that of a quality method and a standard table method
How to solve the problems is always a topic of deep analysis in the technical field of high-pressure water meter verification, and many problems are still not well solved no matter in the aspect of theoretical research or technical application. The high-pressure angle type water meter mass method calibrating device with high metering accuracy, simple operation, high automation degree and strong universality is required to realize intelligent, efficient and accurate detection.
Therefore, the research on the metering performance and the calibrating device of the diagonal high-pressure water injection meter and the diagonal vortex shedding meter is further developed, and the method has important practical significance and academic value.
SUMMERY OF THE UTILITY MODEL
The single weak point such as lower with the measuring accuracy degree relatively of the calibration method to water gauge calibrating installation among the prior art, the utility model aims to solve the problem that a high pressure angle formula water gauge quality method calibrating installation of the degree of accuracy of the verification result that can improve the angle formula water gauge comprehensively is provided.
In order to solve the technical problem, the utility model discloses a technical scheme is:
the utility model relates to a high-pressure angle type water meter mass method calibrating device, which comprises a water tank, a pressure stabilizing container, a commutator, a meter detecting platform and a standard measuring device, wherein a water pump is arranged on a water pipeline between the water tank and the pressure stabilizing container, the outlet end of the pressure stabilizing container is communicated with the meter detecting platform through a degassing filter and a process pipeline, and the outlet side of the meter detecting platform is connected with the commutator through the standard measuring device; the standard measuring device arranged at the outlet side of the commutator adopts an electronic scale, and a weighing container is arranged on the electronic scale; the meter checking platform is provided with a plurality of meter checking stations.
The meter checking stations comprise a plurality of diameter meter checking loops connected in parallel, a plurality of sets of meter checking stations connected in series are arranged on each meter checking loop, and switching valves are arranged on pipelines on the water inlet side and the water outlet side of each set of meter checking stations.
And a differential pressure transmitter is arranged on each meter checking station.
A pressure transmitter is arranged on the process pipeline;
the standard flowmeter is used as a standard meter and is connected with a meter detecting platform water pipeline in series, the standard flowmeters are multiple groups connected in parallel, a switching valve is arranged on a pipeline on the inlet side of each group of standard flowmeters, and a flow regulating valve is arranged on the outlet side of each group of standard flowmeters.
A return pipeline is arranged between the outlet side of the air elimination filter and the water tank, and a switch valve is arranged on the return pipeline.
And a water pipeline at the outlet side of the weighing container is communicated with the water return tank through a drain valve.
The meter clamping shell of each station on the meter checking platform is made of transparent materials.
The utility model has the following beneficial effects and advantages:
1. the utility model discloses a form that two kinds of flow verification methods of static mass method and standard meter method combined together has replaced traditional water gauge calibrating installation's volumetric method examination form. The defect of single verification of the conventional high-pressure water meter verification device by a volumetric method is overcome; meanwhile, the static mass method calibration system utilizing the device can calibrate and trace the standard flowmeter used in the device at any time, and the accuracy and reliability of quantity value transmission are better guaranteed.
2. The utility model provides a static mass method device's extension certainty is not less than 0.05% (k is 2), and standard table method device's extension certainty is not less than 0.3% (k is 2), and flow stability is not more than 0.2%, and the device flow scope is (0.3 ~ 35) m3/h。
3. The utility model discloses a purpose-built PC high strength transparent material (polycarbonate) preparation is examined the double-layered table watchcase of water gauge, can carry out the naked eye observation to the leakproofness state of examining the water gauge in the device verification process, and the leakproofness and the stability of more directly perceived effectual judgement water gauge, each of more accurate definite is examined the running state of water gauge, avoids unnecessary investigation to get rid of, saves working time, has improved verification efficiency greatly.
4. The utility model discloses be equipped with differential pressure transmitter before examining the water gauge, can examine every table station or concrete every examined the water gauge and carry out independent pressure monitoring.
5. The utility model discloses a multistation (4 stations), the mode of many bores (DN25 DN50) examination simultaneously, improved water gauge examination efficiency, all examination work are once accomplished.
6. The utility model discloses but utilize automatic examination system of observing and controling to realize full automated inspection under detecting software program control, characteristics such as software interface is clear pleasing to the eye, easy and simple to handle, experimental data and analysis data result can with Excel software direct dynamic connection, can be convenient accomplish experimental report fast, have functions such as data storage, certificate printing, analysis statistics.
7. The utility model discloses but wide application angle formula high pressure water injection table and angle formula vortex flowmeter's metrological verification accords with the requirement of relevant national metrological verification regulation, especially has the advantage in the aspect of comparing of device verification method.
Drawings
Fig. 1 is a schematic structural view of a mass method calibration device for a high-pressure angle water meter of the present invention;
fig. 2 is the process flow of the present invention.
Wherein, 1 is the water tank, 2 is the water pump, 3 is the steady voltage container, 4 is the filter that disappears, 5 is the process pipeline, 6 is pressure transmitter, 7 is the ooff valve, 8 is differential pressure transmitter, 9 is the water gauge of being examined, 10 is temperature transmitter, 11 is standard flowmeter, 12 is flow control valve, 13 is the commutator, 14 is the container of weighing, 15 is the electronic scale, 16 is the drain valve, 17 is compressed air power air supply, 18 is computer detection and control system, 19 is the return line, 20 is the air supply line.
Detailed Description
The invention will be further explained with reference to the drawings attached to the specification.
As shown in fig. 1, the utility model provides a high-pressure angle formula water gauge mass method calibrating installation, including water tank 1, steady voltage container 3, commutator 13, examine table and standard measuring vessel, be equipped with water pump 2 on the water pipeline between water tank 1 and steady voltage container 3, the exit end of steady voltage container 3 is through the filter 4 that disappears and technology pipeline 5 with examine table intercommunication, examine table outlet side and connect commutator 13 through standard measuring vessel; the standard measuring device arranged at the outlet side of the commutator 13 adopts an electronic scale 15, and a weighing container 14 is arranged on the electronic scale 15; the meter checking platform is provided with a plurality of meter checking stations.
The meter detecting stations comprise a plurality of diameter meter detecting loops connected in parallel, each meter detecting loop is provided with a plurality of meter detecting stations connected in series, and pipelines on the water inlet side and the water outlet side of each set of meter detecting stations are provided with switch valves 7; a differential pressure transmitter 8 is arranged on each meter checking station; a pressure transmitter 6 is arranged on the process pipeline 5.
The standard flowmeter 11 is used as a standard meter and is connected with a meter detection table water pipeline in series, the standard flowmeters 11 are connected in parallel, a switching valve is arranged on a pipeline at the inlet side of each group of standard flowmeters 11, and a flow regulating valve 12 is arranged at the outlet side of each group of standard flowmeters 11; a return pipeline 19 is arranged between the outlet side of the degassing filter 4 and the water tank 1, a switch valve is arranged on the return pipeline 19, and the return pipeline 19 is used for auxiliary flow regulation during micro flow verification; and a water pipeline at the outlet side of the weighing container 14 is communicated with the water return tank through a drain valve.
The utility model discloses possess two kinds of verification methods, the first method is adopting static mass method, and its theory of operation is, replaces traditional standard metal volume ware as the etalon (primary standard) with electronic scale 15, in the same settlement time, with the quality that the examination medium flows through examining water gauge 9, or calculate through the mass flow who examines water gauge 9 and compare with electronic scale 15 weighing value by the settlement time, thereby confirm the degree of accuracy and the repeatability of examining water gauge 9. The electronic scales 15 generally have high weighing accuracy, and the calibration division value e of the electronic scales 15 generally used in the static mass method device is 1/6000, and the whole device is inspected and evaluated by a national legal metering agency, and provides a calibration/calibration report (certificate) with the maximum expansion uncertainty of 0.03% (k is 2), and generally 0.05% (k is 2), so that the metering and calibration of the 0.2-grade water meter 9 can be realized. The flow source has the advantages of constant pressure, stable flow, high measurement accuracy, short verification time and the like.
The second method adopts a standard meter method, and the working principle of the method is that a high-precision standard flowmeter 11 is used as a standard (secondary standard) to synchronously detect the water meter to be detected, and the standard flowmeter is used as a standard meter to be connected in series with the water meter 9 to be detected for metering comparison, so that the accuracy and the repeatability of the water meter 9 to be detected are determined. The standard flowmeter 11 used in the present device has a measurement uncertainty of 0.2% (k 2), and the overall device is inspected, evaluated and issued a certification extended uncertainty of 0.3% (k 2) by the national legal metering agency. When the 1.0-grade water meter 9 to be detected for general work is detected, the detection method is simple, convenient and cost-saving, and the defect of single detection of the conventional high-pressure water meter detection device by a volumetric method is overcome.
The utility model discloses technical performance and index that reach:
the detection method comprises the following steps: the static mass method plus the standard table method is adopted.
Device expansion uncertainty:
static mass method uncertainty: 0.05% (k ═ 2) electronic scale division value: e-1/6000;
uncertainty of a standard table method: 0.3% (k ═ 2) standard flowmeter accuracy: and (4) 0.2 level.
The flow stability of the device is as follows: less than or equal to 0.2 percent.
The flow range of the device is as follows: (0.3 to 35) m3/h。
The specification of the detected water meter is as follows: DN50 caliber and DN25 caliber are 2 specifications in total.
Verifying the test station: one group, DN50/DN25 parallel connection sharing platform, is made of 304 stainless steel.
The types of the detected water meters are as follows: an angle type high-pressure water injection meter and an angle type vortex shedding flowmeter.
The number of the detected water meters is as follows: DN50 caliber is four checking table station; DN25 is caliber of four checking table stations.
The detected water meter signal: pulse (frequency) signals, analog (4-20) mA current signals, no-signal output direct-reading meters and the like.
The form of the water meter to be detected is as follows: hydraulic pressure type presss from both sides table ware.
And (3) verifying the test medium: and (4) cleaning the water.
Verifying the working pressure: less than or equal to 0.4 MPa.
And (3) verifying the working temperature: (5-40) DEG C.
Providing a power supply of the detected water meter: DC (5V, 12V, 24V), AC 220V.
Total distribution power: not more than 25 kW.
The control mode is as follows: in the verification process, the control mode of the device system adopts automatic verification, and except necessary water meters to be detected, manual clamping is needed, and other verification work can be completed on a computer or operated manually.
The utility model discloses a form that two kinds of flow verification methods of static mass method and standard meter method combined together has replaced traditional water gauge calibrating installation's volumetric method examination form, utilizes the static mass method verification system of this device to calibrate and trace to the used standard flowmeter in the device at any time, and better assurance quantity value transmission is accurate reliable.
When the utility model starts to work, the water pump 2 is started to extract the test water from the water tank 1 according to the verification requirement, and is transmitted to a computer detection and control system 18 through a signal interface to carry out remote frequency control, so as to obtain the rough regulation flow rate of the constant pressure required by the water for test trial, and then the rough regulation flow rate is further stabilized through a pressure stabilizing container 3, a degassing filter 4 and a process pipeline 5, the water for test is transmitted to a water return tank 1 through a switch valve 7, a water meter 9 to be tested, a standard flowmeter 11, a flow regulating valve 12, a commutator 13, a weighing container 14, an electronic scale 15 and a drain valve 16, in the process, the pressure value of the test water is measured by the pressure transmitter 6, the pressure loss value of the tested water meter 9 is measured by the differential pressure transmitter 8, the temperature value of the test water is measured by the temperature transmitter 10, the compressed air required by the pneumatic equipment is provided by the compressed air power air source 17, and the compressed air is sent to each pneumatic equipment through the air supply pipeline 20.
The utility model automatically selects corresponding flow branch and electronic scale 15 (or standard flowmeter 11) according to the size of each flow point and the calibration time by the computer calibration, measurement and control system 18, resets the selected scale, and makes the commutator 13 in the emptying state, and makes the test water circulate in the calibration system; the flow rate is regulated and controlled by a line end flow rate regulating valve 12. When the flow reaches a set flow point and is stable, starting verification to enable the commutator 13 to be in a working state; during the set verification time, the detected water meter 9 and the electronic scale 15 (or the standard flowmeter 11) synchronously accumulate and measure, when the preset verification time is reached, the commutator 13 returns to the emptying state, the detected water meter 9 stops measuring, and simultaneously the mass of the test water in the weighing container 14 in the preset time in the static state is measured, so that the flow rate is calculated; after the data is stored, the drain valve 16 is opened, the test water in the weighing container 14 is drained, the scale is reset, the system automatically stores the verification records after the verification of the set flow points is finished, and verification record reports and certificates in specified formats are printed.
The utility model discloses a guarantee to be examined leakproofness and the stability of water gauge 9, adopt purpose-built PC high strength transparent material (polycarbonate) preparation to be examined the double-layered table watchcase of water gauge 9, a clamping for being examined water gauge 9, this material has the tensile, bending strength is high, impact toughness and creep resistance are good, the heat resistance, cold resistance and dimensional stability are higher, the transparency is high, the hydroscopicity is little, good insulating nature and main characteristics such as machine-shaping nature, the convenience is carried out the naked eye observation to the leakproofness state of examining water gauge 9 in the device verification process, the leakproofness and the stability of more effectual judgement water gauge directly perceived.
The utility model discloses all be equipped with differential pressure transmitter 8 in the preceding, back straight tube section of examining the table station respectively, can examine table station or concrete every examined water gauge 9 and carry out independent pressure monitoring to every.
The utility model discloses a computer detects measurement and control system 18 mainly comprises industrial computer (host computer), PLC switch board (next machine), examination software program, water gauge data camera system, time-recorder, printer and field bus etc. and mainly is that the work such as switch, signal acquisition, data processing, the printing instrument examination report and the certificate of accomplishing flow control equipment. The system control task is completed by taking an upper computer (industrial personal computer), a lower computer (PLC-S7200 Smart) and configuration detection software as cores, a friendly and attractive operation interface is provided, graphical operation control is provided, the action of a field actuator can be controlled by clicking a mouse, the use is visual and convenient, and the real-time monitoring of the state of equipment is realized; the automatic acquisition and automatic reading of measurement data of temperature, pressure and differential pressure transmitters, standard flowmeter flow, detected water meter flow, electronic scales and the like in the process are realized; the automatic control of the water pump (variable frequency speed regulation), the switch valve, the regulating valve and the commutator and the drain valve in the weighing system is realized, and the requirements of pressure regulation, flow regulation and flow switching are met. Therefore, the calculation of metrological verification, the display, storage, printing and the like of verification results, the flow state of the process flow and the measured data are displayed on a screen in real time. The method has the advantages of good compatibility with hardware and strong function. The method has the characteristics of quick development, simple use and friendly interface.
The utility model discloses a system configuration test technology standard flow, experimental number of times, experimental step etc. in the standard flow all design and make according to national standard, regulation, standard requirement. The system has the functions of automatically setting the test process flow and safety monitoring and early warning protection.
The utility model discloses in the verification process, the device shows the running state of each pipeline flow field parameter (temperature, pressure, flow etc.) and equipment with the plane graphic formula, and control mode adopts two kinds of modes of automatic examination and manual examination to can switch.
The utility model discloses to the pointer demonstration by the data acquisition of water gauge 9, adopt water gauge calibrated scale camera system, image automatic identification technique, automatic snapshot. Aiming at the data acquisition of the liquid crystal display detected water meter 9, a high-definition camera is adopted to capture images and manually input data.
The process flow of the present invention is shown in fig. 2.
A water supply part: the test medium passes through a water tank, a water pump, a pressure stabilizing container, an air elimination filter, a verification process pipeline, a detected water meter, a standard flowmeter, a flow regulating valve, a commutator and a weighing container, and returns to the water tank after being weighed by an electronic scale;
an air supply part: the air compressor sucks air and then injects compressed air into the air storage tank, and the compressed air is delivered to each pneumatic device through the air supply pipeline after reaching preset air pressure;
assay part: clamping the water meter to be detected on a corresponding verification process pipeline, starting a corresponding water pump, adjusting the opening of a flow regulating valve, regulating the flow rate, working pressure and other numerical values of a test medium to the flow required by verification and keeping stable, enabling the test medium to flow through the water meter to be detected and a standard flowmeter, switching the direction of fluid through a commutator to a weighing container, calculating the volume flow of the water meter to be detected according to the mass of the test medium flowing through the water meter to be detected or the set time, comparing the volume flow of the water meter to be detected with the weighing of an electronic scale, and comparing the output flow values of the two, thereby determining the metering accuracy and the repeatability of the water meter to be detected.
In the embodiment, a multi-station (4-station) and multi-caliber (DN25\ DN50) simultaneous verification mode is adopted, the water meter verification efficiency is improved, and all verification work is completed at one time.
Claims (8)
1. The utility model provides a high pressure angle formula water gauge mass method calibrating installation which characterized in that: the water pump is arranged on a water pipeline between the water tank and the pressure stabilizing container, the outlet end of the pressure stabilizing container is communicated with the meter detecting platform through a degassing filter and a process pipeline, and the outlet side of the meter detecting platform is connected with the commutator through the standard measuring device; the standard measuring device arranged at the outlet side of the commutator adopts an electronic scale, and a weighing container is arranged on the electronic scale; the meter checking platform is provided with a plurality of meter checking stations.
2. The mass method calibrating device for the high-pressure angle water meter as defined in claim 1, wherein: the meter checking stations comprise a plurality of diameter meter checking loops connected in parallel, a plurality of sets of meter checking stations connected in series are arranged on each meter checking loop, and switching valves are arranged on pipelines on the water inlet side and the water outlet side of each set of meter checking stations.
3. The mass method calibrating device for the high-pressure angle water meter as defined in claim 2, wherein: and a differential pressure transmitter is arranged on each meter checking station.
4. The mass method calibrating device for the high-pressure angle water meter as defined in claim 1, wherein: the process pipeline is provided with a pressure transmitter.
5. The mass method calibrating device for the high-pressure angle water meter as defined in claim 1, wherein: the standard flowmeter is used as a standard meter and is connected with a meter detecting platform water pipeline in series, the standard flowmeters are multiple groups connected in parallel, a switching valve is arranged on a pipeline on the inlet side of each group of standard flowmeters, and a flow regulating valve is arranged on the outlet side of each group of standard flowmeters.
6. The mass method calibrating device for the high-pressure angle water meter as defined in claim 1, wherein: a return pipeline is arranged between the outlet side of the air elimination filter and the water tank, and a switch valve is arranged on the return pipeline.
7. The mass method calibrating device for the high-pressure angle water meter as defined in claim 1, wherein: and a water pipeline at the outlet side of the weighing container is communicated with the water return tank through a drain valve.
8. The mass method calibrating device for the high-pressure angle water meter as defined in claim 1, wherein: the meter clamping shell of each station on the meter checking platform is made of transparent materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120341309.2U CN214096281U (en) | 2021-02-05 | 2021-02-05 | High-pressure angle type water meter mass method calibrating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120341309.2U CN214096281U (en) | 2021-02-05 | 2021-02-05 | High-pressure angle type water meter mass method calibrating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214096281U true CN214096281U (en) | 2021-08-31 |
Family
ID=77440275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120341309.2U Active CN214096281U (en) | 2021-02-05 | 2021-02-05 | High-pressure angle type water meter mass method calibrating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214096281U (en) |
-
2021
- 2021-02-05 CN CN202120341309.2U patent/CN214096281U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201925716U (en) | Metering calibration standard device for liquefied natural gas (LNG) dispenser | |
| CN207649729U (en) | A kind of gas flow automated calibration system device | |
| CN204346638U (en) | A kind of pressure calibration/calibrating installation | |
| CN202599485U (en) | A novel flow mass detection device | |
| CN110274669B (en) | Online calibration method for large-diameter electronic water meter | |
| CN102401235A (en) | LNG (Liquefied Natural Gas) dispenser calibrating device | |
| CN105387339B (en) | CNG on-site proving methods | |
| CN103499373A (en) | Automobile oil tank truck capacity automatic inspection device with self-calibration function and inspection method | |
| CN202349591U (en) | Calibration device of liquefied natural gas (LNG) dispenser | |
| CN100370235C (en) | Method for calibrating flow meter and applied system for calibrating flow meter | |
| CN104568078A (en) | On-site ground hydraulic experiment device calibration method | |
| CN216246713U (en) | Standard meter method water gauge calibrating installation | |
| CN214096281U (en) | High-pressure angle type water meter mass method calibrating device | |
| CN101464173B (en) | System test method for liquid pressure fuel tester | |
| CN1529139A (en) | Automatic calibrating system for heat meter | |
| CN111174875A (en) | On-line calibration method of open channel flowmeter on water delivery channel with closed straight pipe section | |
| CN101271054A (en) | Fluid closed loop type on-line liquid density transmitter | |
| CN112763029A (en) | High-pressure angle type water meter mass method calibrating device | |
| CN109186857A (en) | A kind of interface module for pressure measurement | |
| CN111289064A (en) | Online calibrating device and method for metering performance of hydrogenation machine | |
| CN107589152A (en) | A kind of oil truck is unloaded water content metering device | |
| CN211121530U (en) | Electromagnetic flow calibration device | |
| CN209166600U (en) | A kind of 800mm water flow standard apparatus | |
| CN108414400B (en) | Oil product viscosity determination method and system | |
| CN113899431A (en) | Mobile flow online calibration system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |