CN208155402U - A kind of low-temp. liquid-level meter - Google Patents
A kind of low-temp. liquid-level meter Download PDFInfo
- Publication number
- CN208155402U CN208155402U CN201820654273.1U CN201820654273U CN208155402U CN 208155402 U CN208155402 U CN 208155402U CN 201820654273 U CN201820654273 U CN 201820654273U CN 208155402 U CN208155402 U CN 208155402U
- Authority
- CN
- China
- Prior art keywords
- liquid
- temperature sensor
- temp
- low
- resistance temperature
- 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
Landscapes
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The utility model discloses a kind of low-temp. liquid-level meters, belong to technical field of liquid level measurement.The low-temp. liquid-level meter includes metal tube, platinum resistance temperature sensor and resistance measuring module；The platinum resistance temperature sensor includes the first platinum resistance temperature sensor, the second platinum resistance temperature sensor and third platinum resistance temperature sensor for being distributed in different height position in the metal tube；Resistance value of the resistance measuring module to measure first platinum resistance temperature sensor, the second platinum resistance temperature sensor and third platinum resistance temperature sensor.The low-temp. liquid-level meter structure of the utility model is simple, at low cost and easy to operate.
Description
Technical field
The utility model relates to technical field of liquid level measurement.More particularly, to a kind of low-temp. liquid-level meter.
Background technique
Level measuring technology is based on liquid level sensing element when liquid level changes, can indicate liquid level variation and easy
It detected in the physical quantity of detection, correspondingly simple, reliable signal processing then used according to the changing value of these physical quantitys
Means be converted into can the signal that shows of volume value, finally obtain liquid level.According to level sensor and fluid to be measured
The difference of contact form can be divided into two class of contact measuring method and noncontact measuring method.
Contact measurement is characterized in that liquid level sensing element directly contacts fluid to be measured, and structure has rod-type, tracking mode, drifts along
The characteristics of formula, mechanical etc., this kind of measurement method is that the measuring part that sensor is contacted with fluid to be measured is larger, or must have fortune
Dynamic component needs biggish installation space, and now most of liquidometers being mounted in low-temperature storage tank belong to such shape
Formula.Non-cpntact measurement is the level measuring technology to grow up by technologies such as ultrasonic wave, gamma rays, microwave, laser, especially
Suitable for the level gauging under specific condition, such as under the conditions of severe toxicity, deep-etching, intense radiation.
Cryogenic liquid generally all have the characteristics that small density, low boiling point, easily vaporization, measuring condition is special, level monitoring and
Measure highly difficult, the conventional method for carrying out level sensing and measurement to cryogenic liquid at present has capacitance method, pressure differential method and float method,
New method has hot type mensuration and radar method etc..But structure is complicated, at high cost for the above low temperature level measuring method.
Utility model content
A kind of the purpose of this utility model is to provide structures low-temp. liquid-level meter simple, at low cost, it is easy to operate just
It is used in laboratory.
In order to achieve the goal above, the utility model uses following technical scheme：
A kind of low-temp. liquid-level meter, including metal tube, platinum resistance temperature sensor and resistance measuring module；
The platinum resistance temperature sensor includes the first platinum resistance for being distributed in different height position in the metal tube
Temperature sensor, the second platinum resistance temperature sensor and third platinum resistance temperature sensor；
The resistance measuring module is to measure first platinum resistance temperature sensor, the second platinum resistance temperature sensor
With the resistance value of third platinum resistance temperature sensor.
Preferably, first platinum resistance temperature sensor is located at top in the metal tube；The second platinum resistance temperature
Degree sensor is located at bottom end in the metal tube.
Preferably, the low-temp. liquid-level meter further includes display screen, and the resistance measuring module is by the resistance value of measurement in institute
It states in display screen and shows.
Preferably, the low-temp. liquid-level meter further includes processing module, what the processing module measured resistance measuring module
Resistance value is handled, and the numerical value with the resistance value linear correlation is obtained.
Preferably, the low-temp. liquid-level meter further includes processing module, what the processing module measured resistance measuring module
Resistance value is handled, and the liquid level of cryogenic liquid is obtained.
Preferably, the low-temp. liquid-level meter further includes display screen, and the data that the processing module obtains processing are described
It is shown in display screen.
Preferably, the metal tube is stainless steel metal pipe.
Preferably, the size in the platinum resistance temperature sensor and the consistent direction in metal tube length direction be less than with
The size in the vertical direction in the metal tube length direction.
Preferably, the wall thickness of the metal tube is 0.2mm~0.5mm.
Preferably, first platinum resistance temperature sensor, the second platinum resistance temperature sensor and third platinum resistance temperature
Sensor under mutually synthermal environment resistance value variations less than 0.2 Ω.
The beneficial effects of the utility model are as follows：
Low-temp. liquid-level meter provided by the utility model compared with prior art, has the following advantages that：
1) the not influence vulnerable to the dielectric constant of medium compared with capacitance method, uses simplicity.
2) compared with pressure differential method and float method, this technology structure is simple, at low cost.
3) compared with traditional calorimetry, precision is higher.
4) at low cost compared with radar method, not vulnerable to the influence of liquid mist.
Detailed description of the invention
Specific embodiment of the present utility model is described in further detail with reference to the accompanying drawing.
Fig. 1 is a kind of structural schematic diagram for low-temp. liquid-level meter that the embodiment of the present invention one provides.
A kind of low-temp. liquid-level meter that Fig. 2 provides for the embodiment of the present invention one uses schematic diagram.
Fig. 3 is a kind of use schematic diagram of low-temp. liquid-level meter provided by Embodiment 2 of the present invention.
A kind of low-temp. liquid-level meter that Fig. 4 provides for the embodiment of the present invention three uses schematic diagram.
A kind of low-temp. liquid-level meter that Fig. 5 provides for the embodiment of the present invention four uses schematic diagram.
Description of symbols：110- metal tube, the first platinum resistance temperature sensor of 121-, the second platinum resistance temperature of 122- pass
Sensor, 123- third platinum resistance temperature sensor, 130- resistance measuring module, 140- display screen, 150- processing module, 200- hold
Device, 300- cryogenic liquid.
Specific embodiment
In order to illustrate more clearly of the utility model, the utility model is done further below with reference to embodiment and attached drawing
Explanation.It will be appreciated by those skilled in the art that specifically described content is illustrative and be not restrictive below, it should not be with
This limitation protection scope of the utility model.
Bottom end etc. is retouched in top and metal tube in different height, metal tube in metal tube described in the utility model
It states, when being based on specific measurement, one end of insertion liquid level metal tube below is bottom end, exposes the metal tube more than liquid level
One end is top.When measurement, metal tube is inserted vertically into liquid, and three platinum resistance temperature sensors are distributed in different height position.
The description of such location fix and the realistic application conditions of low-temp. liquid-level meter are related, should not be construed as protecting model to the utility model
The limitation enclosed.
Embodiment one
As shown in Figure 1, the present embodiment provides a kind of low-temp. liquid-level meter, including metal tube 110, platinum resistance temperature sensor and
Resistance measuring module 130.
The platinum resistance temperature sensor includes the first platinum resistance for being distributed in different height position in the metal tube
Temperature sensor 121, the second platinum resistance temperature sensor 122 and third platinum resistance temperature sensor 123；First platinum resistance
Temperature sensor 121 is located at top in the metal tube；Second platinum resistance temperature sensor 122 is located in the metal tube
Bottom end.The size in the platinum resistance temperature sensor and the consistent direction in metal tube length direction is less than and the metal tube
The size in the vertical direction of length direction can so reduce influence of the length to measurement accuracy of platinum resistance temperature sensor.One
As platinum resistance temperature sensor be it is cylindric, when installation, as shown in Figure 1, making the cylindrical body of platinum resistance temperature sensor in level
It places, i.e., perpendicular to the length direction of metal tube.
The resistance measuring module 130 is to measure first platinum resistance temperature sensor 121, the second platinum resistance temperature
The resistance value of sensor 122 and third platinum resistance temperature sensor 123.
Its use state is as shown in Fig. 2, cryogenic liquid 300 is stored in container 200, such as liquid nitrogen is generally stored in liquid nitrogen
In tank；When needing to measure liquid level, the low-temp. liquid-level meter of the present embodiment is inserted vertically into cryogenic liquid, until bottom reaches container
Bottom；Resistance value of the resistance measuring module 130 to measure platinum resistance temperature sensor, resistance measuring module 130 can pass through
Port is connected to computer, carries out display resistance value and follow-up data processing etc..After stable reading, so that it may according to the first platinum
Three resistance of resistance temperature sensor 121, the second platinum resistance temperature sensor 122 and third platinum resistance temperature sensor 123
Current liquid level is calculated in value.
Calculation method is as follows：Firstly, according to heat balance principle, without loss of generality, if the second platinum resistance temperature sensor
Height and position is 0, and the height and position of the first platinum resistance temperature sensor is hA, the height and position of third platinum resistance temperature sensor
For hC(upper limit for the low temperature liquid level being likely to occur is arranged in third platinum resistance temperature sensor, when in use, third platinum resistance temperature
Degree sensor cannot submerge cryogenic liquid), the actual height of liquid level is hx, then after thermal balance, can easily it judge, with
The raising of low-temperature liquid level, the resistance value of third platinum resistance temperature sensor can gradually decrease (platinum resistance temperature sensor
Temperature is higher, and resistance value is bigger), and its resistance value is when low-temperature liquid level is without departing from its position, it is high with the liquid level of cryogenic liquid
It is in monotone decreasing relationship that degree, which increases,.By Temperature Distribution of the metallic rod in thermal balance, it is easy to obtain following equation：
RAFor the resistance value of the first platinum resistance temperature sensor measured, RBFor the second platinum resistance temperature sensor measured
Resistance value, RCFor the resistance value of the third platinum resistance temperature sensor measured.
Thus page height h is achieved with by simple derivationxCalculation formula：
By formula (2) it is found that can be obtained the actual height of liquid level by the resistance value for measuring platinum resistance temperature sensor.
Those skilled in the art are readily comprehensible according to principles above, when the height and position of the second platinum resistance temperature sensor
When not being 0,0 still can be set in calculating process, the h being calculatedxIt only need to finally add the second platinum resistance temperature
The actual height h of sensorB?.Therefore, when specifically producing the low-temp. liquid-level meter, the second platinum resistance temperature sensor
Height and position in metal tube, which need to only meet, enters liquid level or less in measurement, it is preferable that the bottom in metal tube is arranged in
End, so set, in actual measurement, when metal tube is inserted into liquid bottommost, the height of the second platinum resistance temperature sensor
Position is 0.Certainly, during actual measurement, metal tube also will not necessarily be inserted into liquid bottommost, need to only guarantee the second platinum
Resistance temperature sensor needs to know at this time the second platinum resistance temperature sensor apart from liquid bottommost below liquid level
Height distance, the calculated h of institutexIt only need to finally add this height.
In addition, the first platinum resistance temperature sensor will will be placed in the position not influenced vulnerable to cryogenic liquid temperature as far as possible,
The influence of the temperature of cryogenic liquid to the reading of the first platinum resistance temperature sensor can be reduced in this way, improve the resolution of liquidometer
Power.Therefore, top is preferably arranged in metal tube in the first platinum resistance temperature sensor in this embodiment；It is arranged such that
It can ensure that the first platinum resistance temperature sensor is to greatest extent far from liquid level, suffered cryogenic liquid temperature influence degree in measurement
It is minimum.
Embodiment two
As shown in figure 3, the present embodiment provides a kind of low-temp. liquid-level meter, relative to the low-temp. liquid-level meter in embodiment one, institute
Stating low-temp. liquid-level meter further includes display screen 140, and the resistance measuring module shows the resistance value of measurement in the display screen 140
Show.
Embodiment three
As shown in figure 4, the present embodiment provides a kind of low-temp. liquid-level meter, relative to the low-temp. liquid-level meter in embodiment one, institute
Stating low-temp. liquid-level meter further includes processing module 150, the resistance value that the processing module 150 measures resistance measuring module 130 into
Row processing, obtains the numerical value with the resistance value linear correlation.In addition, the processing module 150 can also directly calculate institute
Survey the liquid level of cryogenic liquid.
Example IV
As shown in figure 5, the present embodiment provides a kind of low-temp. liquid-level meter, relative to the low-temp. liquid-level meter in embodiment three, institute
Stating low-temp. liquid-level meter further includes display screen 140, and the data that the processing module 150 obtains processing are in the display screen 140
Display.
Metal tube 110 in above embodiments is preferably stainless steel metal pipe, it is further preferred that the metal tube
It is 0.2mm~0.5mm that wall thickness, which is general recommendations, and the wall of metal tube is had to thin, can also reduce the volatilization of cryogenic liquid in this way, together
When be also convenient for making liquidometer to be rapidly reached thermal balance, improve measurement efficiency.
In order to ensure a kind of accuracy of low-temp. liquid-level meter of the utility model, three platinum resistance temperature sensors it is consistent
Property will be got well, i.e., described first platinum resistance temperature sensor 121, the second platinum resistance temperature sensor 122 and third platinum resistance temperature
The resistance value variations under mutually synthermal environment of sensor 123 are less than 0.2 Ω.It can overcome due to temperature sensor in this way
The bad bring measurement error of consistency.
Obviously, the above embodiments of the present invention is merely examples for clearly illustrating the present invention, and
It is not limitations of the embodiments of the present invention, for those of ordinary skill in the art, in above description
On the basis of can also make other variations or changes in different ways, all embodiments can not be exhaustive here,
It is all to belong to obvious changes or variations that the technical solution of the utility model is extended out still in the utility model
The column of protection scope.
Claims (10)
1. a kind of low-temp. liquid-level meter, which is characterized in that including metal tube, platinum resistance temperature sensor and resistance measuring module；
The platinum resistance temperature sensor includes the first platinum resistance temperature biography for being distributed in different height position in the metal tube
Sensor, the second platinum resistance temperature sensor and third platinum resistance temperature sensor；
The resistance measuring module is to measure first platinum resistance temperature sensor, the second platinum resistance temperature sensor and
The resistance value of three platinum resistance temperature sensors.
2. low-temp. liquid-level meter according to claim 1, which is characterized in that first platinum resistance temperature sensor is located at institute
State top in metal tube；Second platinum resistance temperature sensor is located at bottom end in the metal tube.
3. low-temp. liquid-level meter according to claim 1, which is characterized in that the low-temp. liquid-level meter further includes display screen, institute
It states resistance measuring module and shows the resistance value of measurement in the display screen.
4. low-temp. liquid-level meter according to claim 1, which is characterized in that the low-temp. liquid-level meter further includes processing module,
The processing module handles the resistance value that resistance measuring module measures, and obtains the number with the resistance value linear correlation
Value.
5. low-temp. liquid-level meter according to claim 1, which is characterized in that the low-temp. liquid-level meter further includes processing module,
The processing module handles the resistance value that resistance measuring module measures, and obtains the liquid level of cryogenic liquid.
6. low-temp. liquid-level meter according to claim 4 or 5, which is characterized in that the low-temp. liquid-level meter further includes display screen,
The processing module shows the data that processing obtains in the display screen.
7. low-temp. liquid-level meter according to claim 1, which is characterized in that the metal tube is stainless steel metal pipe.
8. low-temp. liquid-level meter according to claim 1, which is characterized in that the platinum resistance temperature sensor and the metal
The size in the consistent direction in length of tube direction is less than the size in the direction vertical with the metal tube length direction.
9. low-temp. liquid-level meter according to claim 1, which is characterized in that the wall thickness of the metal tube be 0.2mm~
0.5mm。
10. low-temp. liquid-level meter according to claim 1, which is characterized in that first platinum resistance temperature sensor, second
Platinum resistance temperature sensor and third platinum resistance temperature sensor under mutually synthermal environment resistance value variations less than 0.2 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820654273.1U CN208155402U (en) | 2018-05-04 | 2018-05-04 | A kind of low-temp. liquid-level meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820654273.1U CN208155402U (en) | 2018-05-04 | 2018-05-04 | A kind of low-temp. liquid-level meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208155402U true CN208155402U (en) | 2018-11-27 |
Family
ID=64389051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820654273.1U Active CN208155402U (en) | 2018-05-04 | 2018-05-04 | A kind of low-temp. liquid-level meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208155402U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108426621A (en) * | 2018-05-04 | 2018-08-21 | 北京无线电计量测试研究所 | A kind of low-temp. liquid-level meter |
-
2018
- 2018-05-04 CN CN201820654273.1U patent/CN208155402U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108426621A (en) * | 2018-05-04 | 2018-08-21 | 北京无线电计量测试研究所 | A kind of low-temp. liquid-level meter |
| CN108426621B (en) * | 2018-05-04 | 2024-05-28 | 北京无线电计量测试研究所 | Low-temperature liquid level meter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104020358B (en) | A kind of measure dielectric permittivity and the method for liquid level in LNG gas tank | |
| CN100470211C (en) | Buoyancy-type low temperature level meter | |
| CN106338323A (en) | Site calibration method and calibration system of flowmeter | |
| CN107091667A (en) | The liquid level detection system that a kind of use temperature sensor is realized | |
| JPS60159615A (en) | Level indicator | |
| CN208155402U (en) | A kind of low-temp. liquid-level meter | |
| CN103968806B (en) | Liquid metal droplet electronic level gauge | |
| CN203534673U (en) | Capacitance liquid level meter of real-time correction dielectric constant | |
| CN103528642A (en) | Capacitance-type liquidometer capable of correcting dielectric constants in real time and liquid level measurement method thereof | |
| Gardner et al. | Osmotic coefficients of some aqueous sodium chloride solutions at high temperature | |
| CN206114150U (en) | Measure thermocouple time constant's device | |
| CN108426621B (en) | Low-temperature liquid level meter | |
| CN103149233B (en) | The device and method of test material thermal physical property parameter | |
| CN105372288B (en) | A kind of rate of heat flow measuring instrument and measuring method | |
| CN205091026U (en) | Capacitive liquid level sensor | |
| US6553822B2 (en) | Liquid volume measurement | |
| RU2521270C1 (en) | Method to define plane inclination angle | |
| CN101246032A (en) | Oil amount sensor | |
| CN212931553U (en) | Vacuum tube type temp. difference liquid level meter | |
| CN105043501A (en) | Liquid level detecting device for low-temperature liquid nitrogen and detecting method thereof | |
| CN214121300U (en) | Unstable liquid measuring device of flow in closed pipeline | |
| CN213748403U (en) | Flexible rule for engineering survey | |
| US2760373A (en) | Liquid level and temperature indicator | |
| Praveen et al. | Continuous-type liquid level measurement system using pulsating sensor | |
| CN203772359U (en) | Array type platinum resistance liquid-level measurement device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |