CN109540252A - A kind of Novel storage tank level measuring method and system - Google Patents
A kind of Novel storage tank level measuring method and system Download PDFInfo
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- CN109540252A CN109540252A CN201811439954.7A CN201811439954A CN109540252A CN 109540252 A CN109540252 A CN 109540252A CN 201811439954 A CN201811439954 A CN 201811439954A CN 109540252 A CN109540252 A CN 109540252A
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- 238000003860 storage Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims description 24
- 239000007788 liquid Substances 0.000 claims abstract description 64
- 238000005259 measurement Methods 0.000 claims abstract description 24
- 238000012546 transfer Methods 0.000 claims abstract description 19
- 238000010521 absorption reaction Methods 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 5
- 229920002379 silicone rubber Polymers 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 8
- 238000000691 measurement method Methods 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 description 19
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 239000003350 kerosene Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
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- 239000003921 oil Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000001464 adherent effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000006244 Medium Thermal Substances 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000003416 augmentation Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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- 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
Abstract
The invention discloses a kind of Novel storage tank liquid level measuring systems, relate to the use of heat transfer principle measurement tank level field, and liquid level emasuring device includes flexible heat source face, single channel heat flow appearance and matched temperature control system.The measurement method of the measuring system is the following steps are included: setting the suitable temperature in flexible heat source face and keeping constant, it is close on storage tank outer wall when measurement, thermal flow sensor is placed between flexible heat source face and storage tank wall surface, it is moved from top to bottom along wall surface together, the heat flow density of different height position heat transfer is measured simultaneously, observe the variation of thermal flow sensor measurement numerical value, gas-liquid two-phase is split into gas-liquid interface punishment, substance heat absorption capacity changes, heat flow density changes at liquid level acutely, so that it is determined that liquid level to be measured.The present invention can be not directly contacted with liquid, measure the liquid level position in closed storage tank.System is succinct, easy to operate, easy to carry, can exempt cumbersome field wiring, reduces the aperture on container, saves manpower and material resources.
Description
Technical field
The present invention relates to liquid level measurement field, specifically a kind of Novel storage tank level measuring method and system.
Background technique
Level measuring technology needs in wet tank industrial production in chemical industry, petroleum etc., especially in the transport of product oil and
Consequence is occupied in storage.Existing level measuring technology includes following several: fiber optic liquid height meter, magnetostriction
Liquidometer, tuning fork liquid level limit switch, differential pressure type level gauge, radar level gauge, servo type float level meter etc. are several newer
Technology of Level Detection.Portion of techniques haves the shortcomings that very big, and technology is complicated, such as: differential pressure levelmeter is due to oil density and aqueous
The variation of rate causes accuracy very poor；The problems such as ultrasonic level gage, radar level gauge etc. are due to foam, crude oil skinning there is also
Large error, even error signal the problem of.
Storage tank typically belongs to pressure vessel and equipment, needs to carry out national special equipment and puts on record, and production factory testing is completed
Generally do not allow to carry out the operation such as be open again afterwards, and these equipment reach live distance farther out after carrying out skid, instrument one
As cannot be mounted directly, can be installed after scene need to be arrived, but in this way generally require to tube body carry out pressure testing again, when instrument goes out
After existing failure, need to stop to produce, lay down pressure, even whole memory is cleared up after just can be removably mounted instrument.Now,
We are invented a kind of new the different principle of the substance heat absorption capacity based on variety classes, different phase using heat transfer method
The convenient and fast liquid level measurement method of type, it is possible to prevente effectively from the above problem.
Summary of the invention
The purpose of the present invention is to provide a kind of Novel storage tank level measuring method and systems, to solve above-mentioned background technique
The problem of middle proposition.
To achieve the above object, the invention provides the following technical scheme:
A kind of Novel storage tank liquid level measuring system, including storage tank, the outside of the storage tank is equipped with liquid level emasuring device, described
Liquid level emasuring device includes flexible heat source face, single channel heat flow appearance and temperature control system, and the flexibility heat source face paste is set to
On storage tank outer wall, thermal flow sensor, the thermal flow sensor and single channel are equipped between the flexibility heat source face and storage tank outer wall
Heat flow appearance is electrically connected.
As a further solution of the present invention: the temperature control system includes power supply, single-chip microcontroller, temperature sensor, opens
Close device and silicon rubber heater, power supply in the temperature control system, single-chip microcontroller, temperature sensor, switching device and
Silicon rubber heater is electrically connected by conducting wire.
As a further solution of the present invention: the single channel heat flow appearance is heat capacity type heat flow appearance.
As a further solution of the present invention: the flexibility heat source face is made of silicon rubber heater.
A kind of Novel storage tank level measuring method, comprising the following steps: by thermal flow sensor be placed on flexible heat source face with
Between storage tank wall surface and it is close to storage tank wall surface and moves from top to bottom, and measure the heat flow density of different height position heat transfer, sees
The variation for examining thermal flow sensor measurement numerical value is split into gas-liquid two-phase in gas-liquid interface punishment, and heat absorption capacity changes, and hot-fluid is close
Degree changes at liquid level acutely, so that it is determined that liquid level to be measured.
Compared with prior art, the invention has the advantages that using in the diabatic process of the identical temperature difference, due to the suction of medium
Thermal energy power is different, leads to the principle that heat flow density is of different sizes, at the gas-liquid interface in container, heat flow density can occur larger
Variation, by comparing different height heat flow density change size, and then it can be concluded that liquid level position, the present invention can not
Direct contact liq, so that it may the liquid level position in closed storage tank is measured, system is succinct, and it is easy to use, it is easy to carry, it can exempt from
Except cumbersome field wiring, the aperture on container is reduced, manpower and material resources are saved.
Detailed description of the invention
Fig. 1 is Novel storage tank level gauging experimental method schematic diagram.
Fig. 2 is Novel storage tank level measuring method schematic diagram.
Fig. 3 is the steel tank structural schematic diagram of Novel storage tank liquid level measuring system.
Fig. 4 is the structural schematic diagram that heat source face centre-height is 0.75m in Novel storage tank level gauging experimentation.
Fig. 5 is the structural schematic diagram that heat source face centre-height is 0.5m in Novel storage tank level gauging experimentation.
Fig. 6 is the structural schematic diagram that heat source face centre-height is 0.25m in Novel storage tank level gauging experimentation.
Fig. 7 is the heat-flow measurement schematic diagram of double thermal flow sensors in Novel storage tank level gauging experimentation.
Fig. 8 is double thermal flow sensor measuring system schematic diagrames in Novel storage tank level gauging experimentation.
In figure: 1- flexibility heat source face, 2- thermal flow sensor, 3- temperature control system, 4- single channel heat flow appearance.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
It should be noted that term " center ", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outside" etc.
The orientation or positional relationship of instruction is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of the description present invention and letter
Change description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific orientation construct and
Operation, therefore be not considered as limiting the invention.In addition, term " first ", " second ", " third " are only used for description mesh
, it is not understood to indicate or imply and faces ground importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Embodiment 1
Referring to Fig. 1, a kind of Novel storage tank level measuring method and system, including storage tank, the outside of the storage tank are equipped with
Liquid level emasuring device, the liquid level emasuring device include flexible heat source face 1, single channel heat flow appearance 4 and temperature control system 3,
The flexibility heat source face 1 is attached on storage tank outer wall, is equipped with thermal flow sensor 2 between the flexibility heat source face 1 and storage tank outer wall,
The thermal flow sensor 2 is electrically connected with single channel heat flow appearance 4, and the temperature control system 3 includes power supply, single-chip microcontroller, temperature
Sensor, switching device and silicon rubber heater, the temperature control system include power supply, single-chip microcontroller, temperature sensor, open
It closes device and silicon rubber heater to be electrically connected by conducting wire, the single channel heat flow appearance 4 is heat capacity type heat flow appearance, can be with
The heat flow density of storage tank different height position in accurate measurement diabatic process.
It is also possible to which multiple thermal flow sensors by using multichannel heat flow appearance measure, multiple hot-fluids
Inductor is vertically fixed on flexible heat source face, measures multiple heat flow densities under the identical temperature difference, compares the induction of different location hot-fluid
The heat flow density size of device measurement, it is easier to judge the position of liquid level.
In addition, the measuring system is when measuring oil tank or other inflammable and explosive flow containers, it should be added using explosion-proof type silicon rubber
Hot device, system do anti-riot processing.
The apparatus system is simple, and equipment is light, and can readily measure the liquid level of different height fluid reservoir, which can
To measure the storage tank of different-thickness wall surface and different materials, principle is to change the temperature in flexible heat source face, with storage tank wall surface
Temperature form the larger temperature difference.For tank skin thickness, the temperature in flexible heat source face can be turned up in the storage tank of thermal conductivity of material difference,
The big temperature difference is formed with detected fluid medium, carrys out augmentation of heat transfer.
By improving the temperature in flexible heat source face, the diabatic process between medium of the flexible heat source towards heating conduction difference
In, increase the numerical value of the heat flow density of heat transfer.This method applies a heat source by the outside wall surface to storage tank, utilizes heat flow appearance
The heat flow density conducted heat between measurement.This measurement method can not have to the liquid in contact storage tank, reduce opening on storage tank
Mouthful, reduce corrosion of the pot liquid to measuring instrument, reduces measurement cost.
Designing PID program keeps temperature constant.Temperature sensor is housed in the outside in flexible heat source face, single-chip microcontroller is according to temperature
The flexible heat source face temperature for spending sensor measurement, controls the opening and closing of power supply and the size of voltage, silicon rubber can be kept to heat
The thermostat temperature of device can also adjust temperature in temperature range.
Single channel heat flow appearance is heat capacity type heat flow appearance in the present invention.By thermal flow sensor measure heat source face with tank wall
The heat flow size transmitted in the unit time in the conduction process of medium in face different height and storage tank.By comparing heat flow
Variation size, at liquid level, heat flow density can be varied widely, so that it may judge the liquid level position of storage tank.
Embodiment 2
The thermal flow sensor 2 is equipped with multiple, multiple 2 connecting multi-channel heat flow appearances of thermal flow sensor, the multi-pass
Road heat flow appearance is equipped with display screen.As improvement on the basis of this system or innovate.
Referring to Fig. 2, a kind of Novel storage tank level measuring method, comprising the following steps: multiple thermal flow sensors are vertical
It is fixed on flexible heat source face, the side that flexible heat source face 1 is fixed with thermal flow sensor is adjacent to the lower part of storage tank wall surface.And from
Under to upper movement, and measure different height position heat transfer heat flow density, observation thermal flow sensor 2 measure numerical value variation,
In different positions, multiple heat flow density values are observed, finds change violent position in a group.
Method And Principle of the invention: the heat absorption capacity of different media is different, the specific heat of heat absorption capacity and substance, density,
Thermal coefficient is related.Thermal coefficient is the parameter for characterizing thermal conductivity of material superiority and inferiority.In diabatic process, wall surface and tank intermediary are given
Matter sets certain temperature difference, and flexible heat source is towards the different fluid medium in tank in the of different sizes of unit time transmitting heat.
In storage tank, it is understood that there may be the identical fluid media (medium) of two or more temperature, there are liquid and solid-state, different fluid media
Heat absorption capacity it is not identical.The heat absorption capacity of liquids in general is greater than the heat absorption capacity of gas.By being set to adherent flexible heat source face
A fixed higher temperature measures flexible heat source face and conducts heat in the different height position in container outer wall face to fluid media (medium) in storage tank
Heat flow density numerical value, and compare numerical values recited, to determine liquid level position.
This system concrete operations: a heat flow transducer is pasted in the face of the flexible tight container of heat source face paste of square, is made
Flexible heat source face is set as suitable temperature with temperature control system, forms certain temperature difference with the temperature of fluid reservoir.So
Afterwards by the lower part of the flexible tight fluid reservoir of heat source face paste, after 10 seconds, the heat flow density value of thermal flow sensor measurement is recorded.Then
5cm is moved upwards in turn, and measures and records down the heat flow density value of the height, compares the variation of heat flow density.Work as hot-fluid
When acute variation occurs for density value, illustrate this highly and be the position of the liquid level in container.
Experiment 1: research purpose be the adherent heat source of measurement to different medium in container diabatic process heat flow density size.
Experimental provision: side length is 1m × 1m × 1m, the steel tank of wall thickness 0.075m, 0.015m × 0.015m by silicon rubber heater
The flexible heat source face of composition and matched temperature control system, a single channel heat flow appearance, water, kerosene.(λ water > λ kerosene > λ
Air, λ are the thermal coefficient of material)
Heat source is measured to the heat flow density in the diabatic process of water in container.Water is filled into steel tank, the temperature of water is 25
DEG C, flexible heat source face paste is attached to the outside wall surface center of steel tank, the heat flow transducer of single channel heat flow appearance is placed on soft
Between property heat source face and container outer wall face.The steady temperature that flexible heat source face is respectively set using temperature control system is respectively 35
℃,45℃,55℃.Hot-fluid after total heat transfer and heat transfer of the thermal flow sensor measurement from original state to stable state are stablized is close
Angle value.
It is successively kerosene and air in measurement container, temperature is 25 DEG C.The steady temperature in heat source face is 35 DEG C, 45 DEG C, 55
℃.Measure the heat flow density under the heat dissipation capacity and stable state from original state to stable state.Acquired results such as Tables 1 and 2.
1 0.0225m of table2The total heat output (unit W) in heat source face
Heat flow density (unit w/m when the heat transfer of table 2 is stablized2)
In diabatic process, heat is conducted to wall surface by thermally conductive mode, and wall surface is by way of thermally conductive and convection current
Transfer heat to liquid phase or gas phase media.Wall surface is different to the heat that different medium transmits, this and material itself
Property has close relationship.As can be drawn from Table 2, under the identical temperature difference, the heat absorption capacity of fluid media (medium) is bigger, and heat source is towards Jie
The heat transmitted in the matter unit time is more；Otherwise, the heat that heating element is transmitted towards fluid media (medium) is fewer.
From table 2 it can also be seen that under the heat source of different temperatures, medium in flexible heat source face and wall surface and container it
Between heat output can change, temperature is higher, and heat flow density also will increase.We can also conclude that in higher temperature
Under degree, the difference of heat flow density of the heat source towards different medium heat-transfers is increasing.We can use this property to judge
Liquid level, when heat source face container bottom position start measure heat flow density, move up 5cm every time and measure the position heat transfer
Heat flow density.Since the temperature of heat source is high, the heat transfer heat of the conductive heat flow density and heat source face and kerosene of heat source face and air
The difference of current density becomes larger, and when at the interface that heat source face is moved to kerosene and air, the numerical value of thermal flow sensor can occur
Violent variation, thus we may determine that the position of liquid level.
Experiment 2: the heat transfer situation of measurement heat source face different height in wall surface of the container.Experimental provision: a side length is 1m
× 1m × 1m, the steel tank of wall thickness 0.075m, the flexible heat source face of the silicon rubber heater composition of 15cm × 15cm and a sleeving temperature
Control system, a single channel heat flow appearance, kerosene.
It is 25 DEG C of kerosene that temperature is injected into steel tank, and liquid level control is 0.5m.Set the temperature in flexible heat source face as
It 45 DEG C, is attached in steel tank outside wall surface, the height at heat source face center is 0.25m.
Heat source face moves from bottom to top, measures the heat flow density value of multiple and different height respectively, in initial position heat source face
The heart is 0.25m in steel tank outside wall surface height, and thermal flow sensor measures heat flow density.Heat source face centre-height is 0.5m, hot-fluid
Sensor measurement goes out heat flow density.It is 0.75m that last bit, which sets heat source face centre-height, and thermal flow sensor measures heat flow density.Such as
Table 3 shows.
| Position | 0.75m | 0.7m | 0.6m | 0.55m | 0.5m | 0.45m | 0.4m | 0.3m | 0.25m |
| Heat flow density | 51.28 | 54.27 | 61.89 | 65.57 | 71.11 | 75.05 | 78.39 | 82.00 | 79.92 |
Heat flow density (the w/m of 3 different height position of table heat transfer2)
From table 3, we obtain can by observation heat flow density the heat flow density of different height position size,
When liquid level position 0.45m to 0.55m, variation is had occurred acutely in heat flow density, it is possible thereby to judge that liquid level position is arrived in 0.45m
Between 0.55m.
For the accuracy for increasing measurement, we vertically paste multiple thermal flow sensors in heat source face, so that it may realize one
A height and position measures one group of heat flow density value, we can be according to the variation size of this group of heat flow density value, when heat source face
On the downside of liquid level or on the upside of liquid level, one group of heat flow density value varies less the height of measurement；When heat source planar survey to liquid level position
It sets, the data of the thermal flow sensor measurement on the upside of heat source face are the heat transfer of heat source and air, the thermal flow sensor on the downside of heat source face
The data of measurement are the heat transfer of heat source and liquid, and heat flow density value can mutate, it is possible thereby to judge the position of liquid level.
Experiment 3: heat flow density value is measured using two thermal flow sensors.Experimental provision: a side length is 1m × 1m × 1m,
The steel tank of wall thickness 0.075m, the flexible heat source face of the silicon rubber heater composition of 15cm × 15cm and a set of temperature control system,
One multichannel heat flow appearance, kerosene.
It is 25 DEG C of kerosene that temperature is injected into steel tank, and liquid level control is 0.5m.It is contacted in flexible heat source face with wall surface
Side vertically paste two heat flow transducers, be divided into 5cm between two thermal flow sensors, thermal flow sensor 1 is in upper, hot-fluid induction
Flexible heat source face is tightly attached in wall surface of the container, under such as Fig. 8 by device 2.
The temperature that the flexible heat source face of adjusting 15cm × 15cm is arranged is 45 DEG C, is attached in steel tank outside wall surface, initial bit
The height for setting heat source face center is 0.25m.Heat source face is moved from bottom to top, measures the heat flow density value of multiple height respectively, end
Position heat source face centre-height is 0.75m.Measurement thermal flow sensor 1 and thermal flow sensor 2 measure the heat measured in different height
Current density value, such as table 4.
4 different height of table, two thermal flow sensors measure heat flow density (w/m2)
It is close that the heat flow density that thermal flow sensor 2 measures as can be seen from Table 4 is greater than the hot-fluid that thermal flow sensor 1 measures
Degree, the heat absorption capacity of kerosene are greater than the heat absorption capacity of air.And it can be seen that the hot-fluid at 0.45m, 0.5m, 0.55m is close
Degree difference becomes larger compared to the heat flow density difference of other height.Therefore, when observing that heat flow density variation is violent, Ke Yigeng
Accurately judge the liquid level of liquid.It is tested by this, we are it has also been discovered that vertically increase pairs of thermal flow sensor
Number, each height can measure more multi-group data, for comparing the variation of heat flow density, change in heat flow density most violent
Height, then be the liquid level of testing liquid.
Using in the diabatic process of the identical temperature difference, since the heat absorption capacity of medium is different, lead to heat flow density size not
Together, at the gas-liquid interface in container, heat flow density can have greatly changed, and become by comparing the heat flow density of different height
Change size, and then it can be concluded that liquid level position, the present invention can be not directly contacted with liquid, so that it may measure in closed storage tank
Liquid level position, system is succinct, easy to use, easy to carry, cumbersome field wiring can be exempted, reduce the aperture on container,
Save manpower and material resources.
Claims (5)
1. the outside of a kind of Novel storage tank liquid level measuring system, including storage tank, the storage tank is equipped with liquid level emasuring device, feature
It is, the liquid level emasuring device includes flexible heat source face (1), single channel heat flow appearance (4) and temperature control system (3), institute
It states flexible heat source face (1) to be affixed on storage tank outer wall, is equipped with thermal flow sensor between the flexibility heat source face (1) and storage tank outer wall
(2), the thermal flow sensor (2) is the measuring cell of single channel heat flow appearance (4).
2. Novel storage tank liquid level measuring system according to claim 1, which is characterized in that the temperature control system (3)
Including power supply, single-chip microcontroller, temperature sensor, switching device and silicon rubber heater, the temperature control system include power supply,
Single-chip microcontroller, temperature sensor, switching device and silicon rubber heater are electrically connected by conducting wire.
3. Novel storage tank liquid level measuring system according to claim 1, which is characterized in that it is described flexibility heat source face (1) by
Silicon rubber heater is constituted.
4. Novel storage tank liquid level measuring system according to claim 1, which is characterized in that the single channel heat flow appearance (4)
For heat capacity type heat flow appearance.
5. a kind of Novel storage tank level measuring method, which comprises the following steps: attach thermal flow sensor (2) solid
It is scheduled on the center of flexible heat source face (1) side, storage tank wall surface is close to together with flexible heat source face, and under storage tank wall surface
Portion is mobile to upper straight, the heat flow density of measurement different height position heat transfer, the change of observation thermal flow sensor (2) measurement numerical value
Change, is split into gas-liquid two-phase in gas-liquid interface punishment in storage tank, substance heat absorption capacity changes, and heat flow density changes at liquid level
Acutely, so that it is determined that liquid level to be measured.
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| CN110887541A (en) * | 2019-12-02 | 2020-03-17 | 北京航天试验技术研究所 | Method for measuring liquid level by positive temperature coefficient temperature sensor |
| CN110954440A (en) * | 2019-12-11 | 2020-04-03 | 安徽省锐凌计量器制造有限公司 | Density liquid level detection device and detection method |
| CN113211793A (en) * | 2021-06-02 | 2021-08-06 | 青岛科技大学 | Anti-warping device and anti-warping method |
| CN113211793B (en) * | 2021-06-02 | 2022-11-04 | 青岛科技大学 | Anti-warping device and anti-warping method |
| CN113820353A (en) * | 2021-08-02 | 2021-12-21 | 北京锐达仪表有限公司 | Medium layering interface measuring device and heat exchange field interface measuring device |
| CN113820353B (en) * | 2021-08-02 | 2023-11-07 | 北京锐达仪表有限公司 | Medium layering interface measuring device and heat exchange field interface measuring device |
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