CN114001797A - Water tank water amount measuring system and method based on large fire-fighting aircraft - Google Patents
Water tank water amount measuring system and method based on large fire-fighting aircraft Download PDFInfo
- Publication number
- CN114001797A CN114001797A CN202111244468.1A CN202111244468A CN114001797A CN 114001797 A CN114001797 A CN 114001797A CN 202111244468 A CN202111244468 A CN 202111244468A CN 114001797 A CN114001797 A CN 114001797A
- Authority
- CN
- China
- Prior art keywords
- water
- water tank
- water quantity
- control box
- quantity sensor
- 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.)
- Pending
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 274
- 238000000034 method Methods 0.000 title claims description 24
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 24
- 239000010935 stainless steel Substances 0.000 claims abstract description 24
- 239000003990 capacitor Substances 0.000 claims abstract description 9
- 239000011810 insulating material Substances 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 32
- 238000012544 monitoring process Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 238000009863 impact test Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 206010034719 Personality change Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
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
- G01F23/26—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 variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—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 variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
- G01F23/266—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 variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors measuring circuits therefor
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention belongs to the field of special aircraft system design, and discloses a water quantity measuring system based on a large fire-fighting aircraft water tank, which comprises at least one water quantity sensor, a watertight cable and a control box, wherein the water quantity sensor is arranged in the water tank and is connected with the control box through the watertight cable; the water quantity sensor is a long cylindrical sensor and is provided with an inner part and an outer part which are coaxial, the inner part and the outer part are respectively stainless steel inner and outer pipes with different diameters, the stainless steel inner pipe is used as an inner electrode of the capacitor, the stainless steel outer pipe is used as an outer electrode of the capacitor, the stainless steel inner pipe and the stainless steel outer pipe are separated by insulating materials, and the lower part of the outer stainless steel pipe is provided with a water inlet hole. The invention mainly meets the requirements of various airplanes of the airplane and the water tank environment according to the characteristics of the water tank of the large fire-fighting airplane, can be suitable for various special-shaped water tanks, and provides a set of water tank which can acquire the water quantity information of the airplane in real time.
Description
Technical Field
The invention belongs to the field of special aircraft system design, relates to an aircraft water tank measuring system and a measuring method, and particularly relates to a large fire-fighting aircraft water tank water volume measuring system and method.
Background
The hull structure of the large fire-fighting aircraft can be designed into a water tank, water can be drawn in a water area near a fire area in a high-speed sliding mode, and the water tank is loaded with corresponding water volume in a ground water injection mode, so that necessary conditions are provided for a pilot to efficiently execute a fire-fighting task. And because the water tank of the airplane is an irregular water tank, the measurement is difficult to be completed by a common method.
Disclosure of Invention
The invention aims to provide a water quantity measuring system and method based on a water tank of a large fire-fighting aircraft.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a water quantity measuring system based on a large fire-fighting airplane water tank comprises at least one water quantity sensor, a watertight cable and a control box, wherein the water quantity sensor is arranged in the water tank and is connected with the control box through the watertight cable; the water quantity sensor is a long cylindrical sensor and is provided with an inner part and an outer part which are coaxial, the inner part and the outer part are respectively stainless steel inner and outer pipes with different diameters, the stainless steel inner pipe is used as an inner electrode of the capacitor, the stainless steel outer pipe is used as an outer electrode of the capacitor, the stainless steel inner pipe and the stainless steel outer pipe are separated by insulating materials, and the lower part of the outer stainless steel pipe is provided with a water inlet hole. Along with the change of the liquid level height of the measured liquid, the liquid can enter the space between the inner electrode and the outer electrode of the water quantity sensor from the water inlet hole, so that the capacitance in the capacitance type sensor is changed.
Further, the water quantity sensor is two, the length of a single water quantity sensor is close to 1/2 of the height of the water tank, the water quantity sensor is fixed in the water tank in a mode that the inside of the water tank is vertically installed close to the outer side, and the two water quantity sensors are respectively arranged at the bottom and the top of the water tank. By adopting the method, the liquid level of the whole height of the measuring water tank can be covered, and the design is very difficult to install because a single long water quantity sensor is adopted.
Furthermore, the watertight cable is fixed on the wall of the water tank through a bracket and a hoop.
Furthermore, the information of the water quantity sensor is sent to the control box in real time, and the control box processes the water quantity information in real time.
A water quantity measuring method based on a large fire-fighting aircraft water tank adopts the system, and comprises the following steps:
step one, respectively installing a water quantity sensor, a watertight cable and a control box inside and outside a water tank;
judging whether the control box works normally or not, and judging whether a self-checking result is normal or not;
judging whether the self-checking of the water quantity sensor is normal or not, and reporting the self-checking result to a control box;
step four, water is injected into the water quantity sensor to calibrate the zero and full positions, and the capacitance presented by the upper and lower pole tubes is monitored, so that when the water level is at the zero and full positions is judged;
and step five, the water quantity sensor sends water quantity data information to the control box in real time through the watertight cable to provide the water quantity information of the water tank.
Further, in the step one, sealing and water flow impact testing are carried out on the installed water tank.
Further, the fourth step is specifically:
monitoring the capacitance of the water quantity sensor in an empty water tank state to obtain the capacitance when the water level is zero, and calibrating the position of the water tank liquid level zero; then, filling water into the water tank according to the weight of the water, and carrying out primary capacitance monitoring on a certain weight to obtain the liquid level of the water tank at the moment and calibrating the weight and the liquid level; finally, after the water tank is filled, the weight of water injection and the full liquid level position of the water tank are calibrated; and obtaining a water level-water amount relation table according to the calibrated information.
And further, in the fifth step, the water level sensor measures the liquid level of the water tank in real time according to the capacitor and transmits the liquid level to the control box, and the control box converts the liquid level of the water tank into the weight of water according to the water level-water amount relation table obtained in the fourth step and then sends the weight of the water to a driver in real time.
The invention has the advantages that:
1. the water tank is mainly characterized by meeting various airplane requirements and water tank environments of airplanes according to the characteristics of the water tank of the large fire-fighting airplane, being applicable to various special-shaped water tanks, and providing a set of water tank which can acquire the water volume information of the airplanes in real time;
2. the upper water quantity sensor and the lower water quantity sensor are adopted, so that all liquid levels of the water tank can be measured, and the problem that the water quantity sensors are too large and are difficult to install and disassemble is solved; based on the inspiration, in order to solve the problems of installation and disassembly, three or more water quantity sensors can be arranged by the idea;
3. the water quantity sensor is vertically arranged on the water tank, and meanwhile, the influence of the flight attitude change of the airplane on the stability of water quantity data can be ensured to be small in view of high water quantity drawing speed;
4. the connector of the water quantity sensor in the water tank of the airplane and the sealing and corrosion protection treatment of the cable can meet the information transmission requirement in the severe environment of the water tank.
Drawings
FIG. 1 is a schematic diagram of a water tank water volume measuring system based on a large fire-fighting aircraft;
FIG. 2 is a schematic diagram of a water sensor mounted to a water tank based large fire fighting aircraft;
wherein, 1-water yield sensor, 2-watertight cable, 3-control box.
Detailed Description
This section is an example of the present invention and is provided to explain and illustrate the technical solutions of the present invention.
A water quantity measuring system based on a large fire-fighting airplane water tank comprises at least one water quantity sensor 1, a watertight cable 2 and a control box 3, wherein the water quantity sensor 1 is arranged in the water tank, and the water quantity sensor 1 is connected with the control box 3 through the watertight cable 2; the water quantity sensor 1 is a long cylindrical sensor and is provided with an inner part and an outer part which are coaxial, the inner part and the outer part are respectively stainless steel inner and outer pipes with different diameters, the stainless steel inner pipe is used as an inner electrode of a capacitor, the stainless steel outer pipe is used as an outer electrode of the capacitor, the stainless steel inner pipe and the stainless steel outer pipe are separated by insulating materials, and the lower part of the outer stainless steel pipe is provided with a water inlet hole. Along with the change of the liquid level height of the measured liquid, the liquid can enter the space between the inner electrode and the outer electrode of the water quantity sensor from the water inlet hole, so that the capacitance in the capacitance type sensor is changed.
The water quantity sensors 1 are two, the length of a single water quantity sensor is close to 1/2 of the height of the water tank, the water quantity sensor 1 is fixed in the water tank in a mode that the inside of the water tank is vertically installed close to the outer side, and the two water quantity sensors 1 are respectively arranged at the bottom and the top of the water tank. By adopting the method, the liquid level of the whole height of the measuring water tank can be covered, and the design is very difficult to install because a single long water quantity sensor is adopted.
The watertight cable 2 is fixed on the wall of the water tank through a bracket and a hoop.
The information of the water quantity sensor 1 is sent to the control box 3 in real time, and the control box 3 processes the water quantity information in real time.
A water quantity measuring method based on a large fire-fighting aircraft water tank adopts the system, and comprises the following steps:
step one, respectively installing a water quantity sensor, a watertight cable and a control box inside and outside a water tank;
judging whether the control box works normally or not, and judging whether a self-checking result is normal or not;
judging whether the self-checking of the water quantity sensor is normal or not, and reporting the self-checking result to a control box;
step four, water is injected into the water quantity sensor to calibrate the zero and full positions, and the capacitance presented by the upper and lower pole tubes is monitored, so that when the water level is at the zero and full positions is judged;
and step five, the water quantity sensor sends water quantity data information to the control box in real time through the watertight cable to provide the water quantity information of the water tank.
In the first step, the sealing and water flow impact test of the installed water tank is also included.
The fourth step is specifically as follows:
monitoring the capacitance of the water quantity sensor in an empty water tank state to obtain the capacitance when the water level is zero, and calibrating the position of the water tank liquid level zero; then, filling water into the water tank according to the weight of the water, and carrying out primary capacitance monitoring on a certain weight to obtain the liquid level of the water tank at the moment and calibrating the weight and the liquid level; finally, after the water tank is filled, the weight of water injection and the full liquid level position of the water tank are calibrated; and obtaining a water level-water amount relation table according to the calibrated information.
And step five, the water quantity sensor measures the liquid level of the water tank in real time according to the capacitance and transmits the liquid level to the control box, and the control box converts the liquid level of the water tank into the weight of water according to the water level-water quantity relation table obtained in the step four and then sends the weight of the water to a driver in real time.
The following will explain the water tank water quantity measuring system and method of the present invention in detail with reference to the attached drawings and embodiments:
the invention relates to a method for measuring liquid level by a water quantity sensor of a water tank of a large fire-fighting aircraft, which can complete real-time water quantity measurement in the water injection or water drawing process, can ensure the precision and the working stability of a system and is beneficial to a pilot to control the water carrying and using conditions of the aircraft in real time.
As shown in figure 1, the proposed water tank for the airplane is used for measuring the water quantity, and a water quantity measuring system is provided and consists of a water quantity sensor 1, a watertight cable 2 and a control box 3.
The water quantity sensor 1 is in a form that two water quantity sensors 1 are vertically arranged in a water tank close to the outer side;
the watertight cable 2 is used for connecting the water quantity sensor 1 to the control box 3 for data transmission inside the water tank and is fixedly installed through a support and a hoop;
the control box 3 and the water quantity sensor 1 process the water quantity information fed back and measured in real time.
According to a second aspect of the invention, the method for measuring the water quantity of the water tank based on the large fire-fighting aircraft adopts the system, and is characterized in that:
the method comprises the following steps: installing before water quantity measurement: the water quantity sensor 1, the watertight cable 2 and the control box 3 are installed, and are installed and tested according to the requirements of sealing and water flow impact;
step two: judging whether the control box 3 works normally or not and judging whether a self-checking result is normal or not;
step three: judging whether the self-checking of the water quantity sensor 1 is normal or not, and reporting the self-checking result to a control box 3;
step four: the water quantity sensor 1 is used for calibrating the zero and full positions by water injection, and the zero and full positions of the water level can be judged by monitoring the capacitance presented by the upper and lower pole tubes, so that the normal operation can be realized;
step five: the water quantity sensor 1 sends water quantity data information to the control box 3 in real time through the watertight cable 2 to provide water quantity information of the water tank.
In a possible embodiment, when the large fire-fighting aircraft has a plurality of aircraft water tanks, in the fifth step, the control box 3 may respectively determine a task execution required mode according to water volume information of different water tanks, and measure a capacitance value of a liquid level change by using two electrodes of an inner polar tube and an outer polar tube of the water volume sensor 1 to meet a precision measurement requirement of the water volume sensor, the water tanks of the large fire-fighting aircraft are different in shape, and the water volume sensor is additionally installed to measure the water volume in the water tanks, so as to realize a water volume measurement task of the large fire-fighting aircraft.
Claims (8)
1. A water quantity measuring system based on a large fire-fighting airplane water tank is characterized by comprising at least one water quantity sensor (1), a watertight cable (2) and a control box (3), wherein the water quantity sensor (1) is arranged in the water tank, and the water quantity sensor (1) is connected with the control box (3) through the watertight cable (2); the water quantity sensor (1) is a long cylindrical sensor and is provided with an inner part and an outer part which are coaxial, the inner part and the outer part are respectively stainless steel inner and outer pipes with different diameters, the stainless steel inner pipe is used as an inner electrode of a capacitor, the stainless steel outer pipe is used as an outer electrode of the capacitor, the stainless steel inner pipe and the stainless steel outer pipe are separated by an insulating material, and the lower part of the outer stainless steel pipe is provided with a water inlet hole.
2. A water tank water quantity measuring system based on a large fire-fighting aircraft according to claim 1, characterized in that the water quantity sensors (1) are two, the length of the single water quantity sensor is approximate to 1/2 of the height of the water tank, the water quantity sensor (1) is fixed in the water tank in a mode that the inside of the water tank is vertically installed close to the outer side, and the two water quantity sensors (1) are respectively arranged at the bottom and the top of the water tank.
3. A water tank water volume measuring system based on a large fire-fighting aircraft according to claim 1, characterized in that the watertight cable (2) is fixed on the wall of the water tank by means of brackets and clips.
4. The water tank water quantity measuring system based on the large fire-fighting aircraft is characterized in that the information of the water quantity sensor (1) is sent to the control box (3) in real time, and the control box (3) processes the water quantity information in real time.
5. A water quantity measuring method based on a large fire-fighting aircraft water tank is characterized in that the water quantity measuring system based on the large fire-fighting aircraft water tank according to any one of claims 1 to 4 is used, and the method comprises the following steps:
step one, respectively installing a water quantity sensor, a watertight cable and a control box inside and outside a water tank;
judging whether the control box works normally or not, and judging whether a self-checking result is normal or not;
judging whether the self-checking of the water quantity sensor is normal or not, and reporting the self-checking result to a control box;
step four, water is injected into the water quantity sensor to calibrate the zero and full positions, and the capacitance presented by the upper and lower pole tubes is monitored, so that when the water level is at the zero and full positions is judged;
and step five, the water quantity sensor sends water quantity data information to the control box in real time through the watertight cable to provide the water quantity information of the water tank.
6. The water tank water quantity measuring method based on the large fire-fighting aircraft according to claim 5, characterized in that the first step further comprises the steps of carrying out sealing and water flow impact test on the installed water tank.
7. The water quantity measuring method based on the large fire-fighting aircraft water tank is characterized by comprising the following steps:
monitoring the capacitance of the water quantity sensor in an empty water tank state to obtain the capacitance when the water level is zero, and calibrating the position of the water tank liquid level zero; then, filling water into the water tank according to the weight of the water, and carrying out primary capacitance monitoring on a certain weight to obtain the liquid level of the water tank at the moment and calibrating the weight and the liquid level; finally, after the water tank is filled, the weight of water injection and the full liquid level position of the water tank are calibrated; and obtaining a water level-water amount relation table according to the calibrated information.
8. The water tank water amount measuring method based on the large fire-fighting aircraft as claimed in claim 7, wherein in the fifth step, the water amount sensor measures the water tank liquid level according to the capacitance in real time and transmits the water tank liquid level to the control box, and the control box converts the water tank liquid level into the weight of water according to the water level-water amount relation table obtained in the fourth step and then sends the weight of water to a driver in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111244468.1A CN114001797A (en) | 2021-10-25 | 2021-10-25 | Water tank water amount measuring system and method based on large fire-fighting aircraft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111244468.1A CN114001797A (en) | 2021-10-25 | 2021-10-25 | Water tank water amount measuring system and method based on large fire-fighting aircraft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114001797A true CN114001797A (en) | 2022-02-01 |
Family
ID=79924018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111244468.1A Pending CN114001797A (en) | 2021-10-25 | 2021-10-25 | Water tank water amount measuring system and method based on large fire-fighting aircraft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114001797A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1462882A (en) * | 2003-06-25 | 2003-12-24 | 袁倬斌 | Method for producing complex type microelectrode |
| CN101038199A (en) * | 2007-02-09 | 2007-09-19 | 天津大学 | Carbon fiber composite pipe electrode capacitance type oil level sensor and instrument used in same |
| CN201203458Y (en) * | 2008-05-09 | 2009-03-04 | 山东桑乐太阳能有限公司 | Water-proof anti-scaling water level sensor |
| CN201476842U (en) * | 2009-03-25 | 2010-05-19 | 雷向东 | Water level sensor of solar water heater |
| CN202101723U (en) * | 2011-04-28 | 2012-01-04 | 泸州市江阳区永财汽车配件厂 | Electronic water level display unit for automobile spraying water tank |
| CN203148514U (en) * | 2013-01-24 | 2013-08-21 | 李晓刚 | Capacitive self-adaptation liquid level sensor |
| CN103900661A (en) * | 2014-02-19 | 2014-07-02 | 东北电力大学 | Segmented liquid level sensor based on capacitance-to-digital conversion technology |
| CN104236672A (en) * | 2014-09-30 | 2014-12-24 | 四川泛华航空仪表电器有限公司 | Multi-redundancy capacitance type oil quantity sensor |
| CN206038103U (en) * | 2016-08-24 | 2017-03-22 | 深圳市信为科技发展有限公司 | Electric capacity level sensor |
| CN107121175A (en) * | 2017-07-03 | 2017-09-01 | 北京航空航天大学 | A kind of explosion-proof fuel oil measurement apparatus of flush type |
-
2021
- 2021-10-25 CN CN202111244468.1A patent/CN114001797A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1462882A (en) * | 2003-06-25 | 2003-12-24 | 袁倬斌 | Method for producing complex type microelectrode |
| CN101038199A (en) * | 2007-02-09 | 2007-09-19 | 天津大学 | Carbon fiber composite pipe electrode capacitance type oil level sensor and instrument used in same |
| CN201203458Y (en) * | 2008-05-09 | 2009-03-04 | 山东桑乐太阳能有限公司 | Water-proof anti-scaling water level sensor |
| CN201476842U (en) * | 2009-03-25 | 2010-05-19 | 雷向东 | Water level sensor of solar water heater |
| CN202101723U (en) * | 2011-04-28 | 2012-01-04 | 泸州市江阳区永财汽车配件厂 | Electronic water level display unit for automobile spraying water tank |
| CN203148514U (en) * | 2013-01-24 | 2013-08-21 | 李晓刚 | Capacitive self-adaptation liquid level sensor |
| CN103900661A (en) * | 2014-02-19 | 2014-07-02 | 东北电力大学 | Segmented liquid level sensor based on capacitance-to-digital conversion technology |
| CN104236672A (en) * | 2014-09-30 | 2014-12-24 | 四川泛华航空仪表电器有限公司 | Multi-redundancy capacitance type oil quantity sensor |
| CN206038103U (en) * | 2016-08-24 | 2017-03-22 | 深圳市信为科技发展有限公司 | Electric capacity level sensor |
| CN107121175A (en) * | 2017-07-03 | 2017-09-01 | 北京航空航天大学 | A kind of explosion-proof fuel oil measurement apparatus of flush type |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7669473B2 (en) | Pressure-based aircraft fuel capacity monitoring system and method | |
| JP6662859B2 (en) | Multivariable waveguide radar probe | |
| CN102564534B (en) | Magnetic liquidometer for water level of steam drum | |
| CN102620998B (en) | Device and method for pressure test and drainage tests for waved pipeline | |
| CN104154971B (en) | Fuel measuring system automatic detection system | |
| CN101738240B (en) | Capacitance sensing type fuel meter | |
| US5456108A (en) | Baffle assembly for ultrasonic liquid level measuring probe | |
| US12091197B2 (en) | Aircraft fuel system monitoring | |
| CN107167219A (en) | A kind of self-alignment outer patch ultrasonic liquid level switch measuring system and its measuring method | |
| CN109443481A (en) | A kind of closed pressure vessel measuring device and level measuring method | |
| CN107340097A (en) | A kind of measuring system for spacecraft propellant tank | |
| CN103592000A (en) | Liquid level measuring device | |
| CN108627222A (en) | A kind of oil meter nucleus correcting system | |
| CN114001797A (en) | Water tank water amount measuring system and method based on large fire-fighting aircraft | |
| CN203298826U (en) | Glass tube liquid level meter | |
| CN103105344A (en) | Measuring device for measuring medium parameters of pulsed extraction columns in pulse state | |
| CN109374072A (en) | Engine consumption detection system and its method | |
| CN218865235U (en) | Simulation oil tank test device | |
| WO2006032309A1 (en) | Agricultural spray vehicle having one or more capacitive liquid level probes | |
| CN115183839B (en) | Self-adaptive arbitrary-butt-joint boundary liquid level measuring instrument and measuring method thereof | |
| CN201066116Y (en) | Communicating vessels type drum water level sampling and measuring device | |
| CN107024256B (en) | Device and method for measuring liquid level of nuclear reactor container | |
| CN110770145A (en) | Precision depth sensor | |
| CN215684422U (en) | Helicopter forestry disease and pest control variable monitoring device that gives medicine to | |
| CN204007805U (en) | The online caliberating device of a kind of LNG filling machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |