CN107589042B - System and method for measuring density of liquid medicine and method for measuring water level of liquid medicine by using same - Google Patents
System and method for measuring density of liquid medicine and method for measuring water level of liquid medicine by using same Download PDFInfo
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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
- G01F23/14—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 measurement of pressure
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- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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Abstract
The invention relates to a liquid medicine density measuring system, a liquid medicine density measuring method and a liquid medicine water level measuring method using the same, comprising the following steps: a liquid medicine measuring tube connected to the liquid medicine tank filled with liquid medicine therein, the liquid medicine tank containing liquid medicine varying in density with time; a first inflow pipe having a lower end opened at a first position in an inner space of the liquid medicine measuring pipe and guiding air supplied to the inside of the liquid medicine to the inner space of the liquid medicine measuring pipe; the lower end of the second inflow pipe is arranged at a second position higher than the first position by a first distance in the inner space of the liquid medicine measuring pipe, and the second inflow pipe guides gas to the inner space of the liquid medicine measuring pipe; a first gas supply unit and a second gas supply unit for supplying gas to the first inflow pipe and the second inflow pipe, and a control unit for calculating density of the liquid medicine.
Description
Technical Field
The present invention relates to a liquid medicine density measuring system, a liquid medicine density measuring method and a liquid medicine water level measuring method using the same, and more particularly, to a liquid medicine density measuring system, a liquid medicine density measuring method and a liquid medicine water level measuring method using the same, which can continuously and accurately measure the density of liquid medicine in real time.
Background
Generally, the Level (Level) of the chemical stored in the chemical tank may be measured using various sensors (sensors). The water level measuring method using the sensor may be classified into a contact type measuring method and a non-contact type measuring method according to whether a measuring object is contacted or not.
The contact type measuring method can be a water Level Sensor (Level Sensor). With such non-contact measurement methods, however, various safety issues may occur. For example, when a specific chemical solution having toxicity or strong corrosiveness is measured, impurities are absorbed due to corrosion of a contact portion of a sensor, so that purity is lowered, and the chemical solution is exposed to harmful components.
The noncontact measurement method may be a capacitive sensor. Generally, a "Level tree" method is adopted, in which a plurality of capacitive sensors are disposed at appropriate positions of a pipe connecting the upper end and the lower end of the liquid medicine tank, and the presence or absence of liquid medicine at each position is measured. However, it is difficult to accurately measure the liquid medicine level inside the liquid medicine tank in such a manner.
In particular, since the conventional water level sensor measures the chemical liquid component varying with time, a considerable error occurs due to the variation of the density of the chemical liquid.
Disclosure of Invention
(problem to be solved)
The invention aims to provide a liquid medicine density measuring system and a liquid medicine density measuring method which can continuously and correctly measure the real-time change of the density of liquid medicine, and a liquid medicine water level measuring method using the same. (means for solving the problems)
In order to solve the above-described problems to be solved by the present invention, the present invention provides a liquid medicine density measuring system, a liquid medicine density measuring method, and a liquid medicine level measuring method using the same, including: a liquid medicine measuring tube connected to the liquid medicine tank, into which the liquid medicine flows, and the liquid medicine tank contains liquid medicine with density varying with time; a first inflow pipe having a lower end opened at a first position in an inner space of the liquid medicine measurement pipe and guiding air supplied to the inside of the liquid medicine to the inner space of the liquid medicine measurement pipe; a second inflow pipe having a lower end opened at a second position higher than the first position by a first distance in an inner space of the chemical liquid measuring pipe and guiding the gas to the inner space of the chemical liquid measuring pipe; a first gas supply unit for supplying the gas to the first inflow pipe so as to measure the pressure of the chemical solution at the first position; a second gas supply unit for supplying the gas to the second inflow pipe so as to measure the pressure of the chemical solution at the second position; and a control unit for calculating the density of the chemical liquid based on a first pressure of the gas discharged from the first inflow pipe when the gas presses the chemical liquid at the first position, a second pressure of the gas discharged from the second inflow pipe when the gas presses the chemical liquid at the second position, and the first distance.
The control unit may calculate the density of the liquid medicine using the following equation 1.
[ EQUATION 1 ]
In the formula, ρ is the density, g is the gravitational acceleration, △ P is the difference between the first pressure and the second pressure, and △ H is the first distance.
The first air supply unit includes: a first gas supply portion for supplying the gas to the first inflow pipe, a first supply line for connecting the first gas supply portion and the first inflow pipe, and a first control valve positioned on the first supply line for controlling the gas.
The second air supply unit includes: a second gas supply portion for supplying the gas to the second inflow pipe, a second supply line for connecting the second gas supply portion and the second inflow pipe, and a second control valve positioned on the second supply line for controlling the gas.
Meanwhile, the system for measuring the density of the liquid medicine may further include: a first sensor, which is positioned on the first air supply unit and is used for confirming the foaming period of the liquid medicine caused by the gas flowing into the first inflow pipe; and a second sensor, which is positioned on the second air supply unit and is used for confirming the bubbling period of the liquid medicine caused by the gas flowing into the second inflow pipe.
The control unit may predict a first flow rate of the gas flowing in through the first inflow pipe and a second flow rate of the gas flowing in through the second inflow pipe based on a first bubbling period of the liquid medicine measured by the first sensor and a second bubbling period of the liquid medicine measured by the second sensor, and determine whether the first flow rate and the second flow rate are out of respective allowable ranges.
Meanwhile, the control unit may determine whether the first flow rate and the second flow rate have substantially the same value; when the first flow rate and the second flow rate are different in value, the flow rate of the gas is adjusted by at least one of the first control valve and the second control valve.
In addition, the system for measuring the density of the liquid medicine may further include a warning means for notifying the outside when the first flow rate and the second flow rate are out of the respective allowable ranges.
According to various embodiments of the present invention, a method for measuring the density of a liquid medicine using the liquid medicine density measuring system is provided. Which comprises the following steps: disposing the lower end of the first inflow pipe and the lower end of the second inflow pipe on the chemical liquid measurement pipe so as to have the first distance therebetween; measuring the first pressure and the second pressure; and calculating the density of the chemical solution based on the first pressure, the second pressure, and the first pitch.
The method for measuring the density of the liquid medicine can also comprise the following steps: measuring a first bubbling period of the chemical solution caused by the gas flowing into the first inflow pipe and measuring a second bubbling period of the chemical solution caused by the gas flowing into the second inflow pipe; predicting a first flow rate of the gas flowing in through the first inflow pipe and a second flow rate of the gas flowing in through the second inflow pipe based on the first bubbling period and the second bubbling period; determining whether the first flow rate and the second flow rate are within respective allowable ranges; and a step of adjusting the gas flow rate by controlling any one of a first control valve connected to the first inflow pipe and a second control valve connected to the second inflow pipe when at least one of the first flow rate and the second flow rate is out of the respective allowable range.
Meanwhile, the method for measuring the density of the liquid medicine may further include a step of notifying the outside when the first flow rate and the second flow rate are out of the respective allowable ranges.
According to another embodiment of the present invention, in relation to the method for measuring a liquid level of a liquid medicine using the liquid medicine density measuring method according to the present invention, there is provided a liquid medicine level measuring method including a step of calculating the density of the liquid medicine using the following [ formula 1 ], and a step of calculating the liquid medicine level of the liquid medicine using the following [ formula 2 ] based on the density of the liquid medicine.
[ EQUATION 1 ]
In the formula, rho is density, g is gravity acceleration, △ P is the difference between the first pressure and the second pressure, △ H is a first distance;
[ equation 2 ]
In the formula, H is a water level of the chemical solution, ρ is a density, g is a gravitational acceleration, and P2 is a second pressure at which the gas discharged from the second inflow pipe presses the chemical solution at the second position.
Drawings
Fig. 1 is a drawing showing the main structure of the liquid medicine density measuring system according to the present invention.
FIG. 2 is a flow chart illustrating a method for measuring density and a method for measuring water level of a chemical according to the present invention.
Fig. 3a and 3b are views showing changes in the pressure of the liquid medicine with time due to the supply to the liquid medicine measurement pipe.
Fig. 4 is a graph showing the relationship between the flow rate of gas supplied to the liquid medicine measurement pipe and the bubbling period.
Detailed Description
Preferred embodiments that can embody the above-described problems to be solved are described below with reference to the accompanying drawings. In describing the present embodiment, the same name and the same symbol are used for the same structure, and the related additional description will be omitted below.
Referring to fig. 1 to 4, an embodiment of a system, a method and a device for measuring density and water level of a liquid medicine according to the present invention will be described below.
In the present embodiment, the liquid medicine density measuring system includes a liquid medicine measuring tube (100), a first inflow tube (210), a second inflow tube (220), a first air supply unit, a second air supply unit, a first sensor (310), a second sensor (320), a reminder (not shown), and a control unit (not shown).
The liquid medicine measuring tube (100) is connected with the liquid medicine tank, and is filled with the liquid medicine in the liquid medicine tank, and the liquid medicine tank is filled with the liquid medicine which changes according to time density.
The lower end of the first inflow pipe (210) is opened at a first position in the inner space of the liquid medicine measuring pipe (100). The first inflow pipe (210) guides air supplied to the interior of the drug solution to the space inside the drug solution measurement pipe (100).
When the gas flows into the first inflow pipe (210), the gas presses the chemical liquid stored in the inner space of the chemical liquid measuring pipe (100) at the end of the first inflow pipe (210) and forms foam. The pressure of the medical fluid measured by the first sensor (310) is periodically changed according to time by the influence of the generation of the foam.
Here, a period of time-dependent change in the pressure of the liquid chemical due to the bubble generated by the gas flowing through the first inflow pipe (210) is referred to as a first bubble generation period.
The lower end of the second inflow pipe (220) is opened at a second position higher than the first position by a first distance (△ H) in the internal space of the chemical liquid measurement pipe (100), and the second inflow pipe (220) guides the gas supplied to the second gas supply unit to the internal space of the chemical liquid measurement pipe (100).
When the gas flows into the second inflow pipe (220), the gas presses the chemical liquid stored in the inner space of the chemical liquid measuring pipe (100) at the end of the second inflow pipe (220) to form foam. The pressure of the liquid medicine measured by the second sensor (320) is changed according to time by the influence of the generation of the foam, and the second foaming period is displayed.
The first gas supply unit is used for measuring the pressure of the liquid medicine at the first position and supplying the gas to the first inflow pipe (210); and the second gas supply unit supplies the gas to the second inflow pipe (220) in order to measure the pressure of the chemical liquid at the second position. Here, the gas may be a Clean Dry gas (CDA) or nitrogen gas.
Specifically, the first air supply unit includes: a first gas supply portion (510) for supplying the gas to the first inflow pipe (210), a first supply line (411) for connecting the first gas supply portion (510) and the first inflow pipe (210), and a first control valve (410) positioned on the first supply line (411) for controlling the gas flow.
Meanwhile, the second air supply unit includes: a second gas supply portion (520) for supplying the gas to the second inflow pipe (220), a second supply line (421) for connecting the second gas supply portion (520) and the second inflow pipe (220), and a second control valve (420) on the second supply line (421) for controlling the gas flow.
The first sensor (310) is disposed on the first gas supply unit, i.e., the first supply line (411), and is configured to confirm a first bubbling period occurring due to the inflow gas flowing into the first inflow pipe (210).
Specifically, the first sensor (310) measures the first position hydraulic fluid pressure that changes with time due to the inflow of the gas.
Here, if the gas flow rate is small, the bubble generation of the gas is not smooth, which leads to an error in pressure increase; on the contrary, if the gas flow rate is large, the first bubble generation period is shorter than the response time of the first sensor, which causes a cancellation (Offset) phenomenon of the measurement signal, and ultimately leads to a decrease in accuracy.
Therefore, the gas flow rate flowing in through the first inflow pipe (210) should have a first allowable range.
FIG. 3(a) shows the change in the pressure of the first location of the liquid medicine measured by the first sensor (310) when the gas flow rate is 30 cc/min. FIG. 3(b) shows the change in the pressure of the first location of the liquid medicine measured by the first sensor (310) when the gas flow rate is 40 cc/min. It can be seen that the more the gas flow, the shorter the first bubble generation period.
Meanwhile, referring to FIG. 4, when the gas flow rate is 20cc/min, the first bubbling period is 1.36 sec; the first bubbling period was 0.92sec at a gas flow rate of 40 cc/min; the first bubbling period is shown to be 0.527sec when the gas flow is 60 cc/min. It can be seen that the first bubble generation period and the gas flow rate are in a linear relationship.
Here, the first bubbling period is preferably set in consideration of the first sensor response time, in a case where the pressure waveform measured by the first sensor (310) has a predetermined shape.
Also, the second sensor (320) is located on the second gas supply unit, i.e., the second supply line (421), and confirms a second bubbling period occurring due to the inflow gas flowing into the second inflow pipe (220).
The control unit calculates the density of the chemical liquid based on a first pressure when the gas discharged from the first inflow pipe (210) pushes the chemical liquid at the first position, a second pressure when the gas discharged from the second inflow pipe (220) pushes the chemical liquid at the second position, and the first gap (△ H).
Specifically, the control unit may calculate the density of the chemical solution using the following equation 1.
[ EQUATION 1 ]
In the formula, ρ is the density, g is the gravitational acceleration, △ P is the difference between the first pressure and the second pressure, and △ H is the first distance.
As a result, the density of the liquid medicine varying with time can be simply measured in real time using the first pressure when the first inflow pipe gas presses the liquid medicine, the second pressure when the second inflow pipe gas presses the liquid medicine, and the first distance between the lower end of the first inflow pipe and the lower end of the second inflow pipe.
Of course, the present invention is not limited thereto, and the first pressure and the second pressure may be set as an average value of time periods, in which case, a sampling time period for measuring the pressure at the first sensor and the second sensor is taken as a standard.
Meanwhile, the control unit predicts a first flow rate of gas flowing in through the first inflow pipe and a second flow rate of gas flowing in through the second inflow pipe based on a first bubbling period of the liquid medicine measured by the first sensor and a second bubbling period of the liquid medicine measured by the second sensor.
As shown in fig. 4, the bubbling period and the gas flow rate are linearly related, and the first flow rate and the second flow rate can be calculated from the first bubbling period and the second bubbling period.
The control unit determines whether the first flow rate and the second flow rate are out of respective allowable ranges. When the first flow rate and the second flow rate are out of the respective allowable ranges, the first control valve and the second control valve are adjusted to adjust the first flow rate and the second flow rate.
Here, in order to reduce the error in the density of the chemical solution, the first flow rate and the second flow rate should be substantially the same value.
The control unit determines whether the first flow rate and the second flow rate have substantially the same value. When the first flow rate and the second flow rate have different values, the gas flow rate is regulated by at least one of the first control valve and the second control valve.
On the other hand, when the first flow rate and the second flow rate exceed the respective allowable ranges, or the first flow rate and the second flow rate show different values, the reminding tool displays the status information to the outside to inform the operator.
The method for displaying the information by the reminding tool can be as follows: the reminding device emits light in an LED mode; displaying information in the form of a speaker by sound or voice; or to display information in text in the form of a display device.
The system and method for measuring density of a chemical solution and the method for measuring water level of a chemical solution using the same according to the present invention will be described below with reference to fig. 1 and 2.
First, the user places the lower end of the first inflow pipe (210) and the lower end of the second inflow pipe (220) at the drug solution measurement pipe (100) with a first distance (△ H) therebetween.
Subsequently, the drug solution density measurement system is started, and the first sensor (310) measures the drug solution pressure at the first position of the drug solution measurement tube (100), namely the first pressure. Meanwhile, the second sensor (320) measures the liquid medicine pressure at a second position of the liquid medicine measurement pipe (100), that is, the second pressure.
Accordingly, the control unit may calculate the chemical density based on the first pressure, the second pressure, and the first pitch (S40).
Here, in order to reduce the error in the density of the chemical solution, it is necessary to supply the gas of an appropriate flow rate to the first inflow pipe (210) and the second inflow pipe (220) at the same time.
For this, the first sensor (310) measures a first bubbling period of the liquid medicine occurring due to the gas flowing into the first inflow pipe (210), and the second sensor (320) monitors a second bubbling period of the liquid medicine occurring due to the gas flowing into the second inflow pipe (220) (S10).
At this time, the control unit predicts and confirms a first flow rate of the gas flowing in through the first inflow pipe (210) and a second flow rate of the gas flowing in through the second inflow pipe (220) based on the first bubbling period and the second bubbling period (S20).
Subsequently, the control unit determines whether the first flow rate and the second flow rate are within respective allowable ranges.
Next, when any one of the first flow rate and the second flow rate is out of the allowable range, the control unit controls any one of a first control valve connected to the first inflow pipe and a second control valve connected to the second inflow pipe to adjust the gas flow rate (S30).
In addition, the control unit may adjust the gas flow rate by one of the first control valve and the second control valve when the first flow rate and the second flow rate have different values after determining whether the first flow rate and the second flow rate have substantially the same value.
From the results, a first bubbling period of the liquid medicine caused by the gas flowing into the first inflow pipe (210) and a second bubbling period of the liquid medicine caused by the gas flowing into the second inflow pipe (220) are measured, and based on the first bubbling period and the second bubbling period, a first flow rate of the gas flowing into the first inflow pipe (210) and a second flow rate of the gas flowing into the second inflow pipe (220) are predicted, and the first flow rate and the second flow rate are controlled to keep the same value, so that the density error of the liquid medicine caused by the flow rate difference is reduced.
Here, when the first flow rate and the second flow rate are out of the respective allowable ranges, or the first flow rate and the second flow rate show different values, the warning means displays the information on the situation to the outside.
Then, the control unit calculates the liquid level of the chemical solution using the following equation 2 according to the density of the chemical solution (S50).
[ equation 2 ]
In the formula, H is a liquid level of the chemical, ρ is a density, g is a gravitational acceleration, and P2 is a second pressure of the gas discharged from the second inflow pipe when the gas presses the chemical at the second position. Of course, the density ρ of the chemical solution, which varies with time, needs to be calculated in advance by the above equation 1.
From the results, the liquid medicine density and the liquid medicine level are measured by the liquid medicine density measuring system, so that a high-volume flow meter or a flow regulator can be replaced, and the related cost is saved.
The liquid medicine density measuring system, the liquid medicine density measuring method and the liquid medicine water level measuring method using the same have the following effects:
first, the lower end of the first inflow pipe and the lower end of the second inflow pipe are arranged on the liquid medicine measuring pipe, so that after the liquid medicine measuring pipe and the liquid medicine measuring pipe have a first distance, the density of the liquid medicine changing along with time can be simply measured in real time by utilizing a first pressure when the first inflow pipe extrudes the liquid medicine and a second pressure when the second inflow pipe extrudes the liquid medicine. Furthermore, the liquid level of the liquid medicine can be simply measured by using the density of the liquid medicine.
Second, after measuring a first bubbling period of the chemical solution caused by the gas flowing into the first inflow pipe and a second bubbling period of the chemical solution caused by the gas flowing into the second inflow pipe, the first flow rate of the gas flowing into the first inflow pipe and the second flow rate of the gas flowing into the second inflow pipe are predicted by using the first bubbling period and the second bubbling period, and the first flow rate and the second flow rate are controlled to maintain the same value, thereby reducing the density of the chemical solution caused by the difference of the flow rates.
Thirdly, the density and the water level of the liquid medicine are measured by using the liquid medicine density measuring system, which can replace a high-volume flowmeter or a flow regulator, thereby saving the related cost.
As described above, the present invention is not limited to the preferred embodiments described above. Those skilled in the art will be able to make various modifications and implementations without departing from the scope of the invention as defined by the claims.
Claims (7)
1. A system for measuring density of a liquid medicine, comprising:
a liquid medicine measuring tube which is connected with the liquid medicine groove and is filled with liquid medicine in the liquid medicine groove, and the liquid medicine groove is filled with liquid medicine which changes according to time density;
a first inflow pipe having a lower end opened at a first position in an inner space of the liquid medicine measurement pipe and guiding a gas supplied into the liquid medicine to the inner space of the liquid medicine measurement pipe;
a second inflow pipe having a lower end opened at a second position higher than the first position by a first distance in an inner space of the chemical liquid measuring pipe and guiding the gas to the inner space of the chemical liquid measuring pipe;
a first gas supply unit for supplying the gas to the first inflow pipe so as to measure the pressure of the chemical solution at the first position;
a second gas supply unit for supplying the gas to the second inflow pipe so as to measure the pressure of the chemical solution at the second position;
a control unit for calculating the density of the chemical liquid based on a first pressure when the gas discharged from the first inflow pipe presses the chemical liquid at a first position, a second pressure when the gas discharged from the second inflow pipe presses the chemical liquid at a second position, and the first pitch;
a first sensor, which is positioned on the first air supply unit and is used for confirming the foaming period of the liquid medicine caused by the gas flowing into the first inflow pipe; and
a second sensor, which is positioned on the second gas supply unit, and is used for confirming the foaming period of the liquid medicine caused by the gas flowing into the second inflow pipe;
wherein the control unit predicts a first flow rate of the gas flowing in through the first inflow pipe and a second flow rate of the gas flowing in through the second inflow pipe based on a first bubbling period of the liquid medicine measured by the first sensor and a second bubbling period of the liquid medicine measured by the second sensor, and determines whether the first flow rate and the second flow rate are out of respective allowable ranges;
the control unit determines whether the first flow rate and the second flow rate have the same value, and adjusts an air flow rate by at least one of a first control valve connected to the first inflow pipe and a second control valve connected to the second inflow pipe if the first flow rate and the second flow rate have different values;
the first bubble generation period is set in consideration of a response time of the first sensor while the pressure waveform measured by the first sensor is maintained in a constant state.
2. The medical fluid density measurement system according to claim 1,
the control unit calculates the density of the liquid medicine through the following formula 1;
[ EQUATION 1 ]
Where ρ is the density, g is the acceleration of gravity, △ P is the difference between the first pressure and the second pressure, △ H is the first spacing.
3. The medical fluid density measurement system according to claim 1,
the first air supply unit includes: a first gas supply portion for supplying the gas to the first inflow pipe, a first supply line for connecting the first gas supply portion and the first inflow pipe, and the first control valve located on the first supply line for controlling the gas;
the second air supply unit includes: a second gas supply portion for supplying the gas to the second inflow pipe, a second supply line for connecting the second gas supply portion and the second inflow pipe, and the second control valve positioned on the second supply line for controlling the gas.
4. The medical fluid density measurement system according to claim 1, further comprising:
and a warning means for notifying the outside when the first flow rate and the second flow rate are out of the respective allowable ranges.
5. A method for measuring a density of a liquid medicine using the liquid medicine density measuring system according to claim 1, comprising the steps of:
disposing the lower end of the first inflow pipe and the lower end of the second inflow pipe on the chemical liquid measurement pipe to have the first gap therebetween;
measuring a first bubbling period of the chemical solution caused by the gas flowing into the first inflow pipe and measuring a second bubbling period of the chemical solution caused by the gas flowing into the second inflow pipe;
predicting a first flow rate of the gas flowing in through the first inflow pipe and a second flow rate of the gas flowing in through the second inflow pipe based on the first bubbling period and the second bubbling period;
determining whether the first flow rate and the second flow rate are within respective allowable ranges;
a step of adjusting the gas flow rate by controlling any one of a first control valve connected to the first inflow pipe and a second control valve connected to the second inflow pipe when at least one of the first flow rate and the second flow rate exceeds the respective allowable range;
measuring the first pressure and the second pressure; and
calculating the density of the chemical solution according to the first pressure, the second pressure and the first distance;
wherein the first bubble generation period is set in consideration of a response time of the first sensor while maintaining a pressure waveform measured by the first sensor in a constant state.
6. The method for measuring density of medical fluid according to claim 5, further comprising:
and a reminding step of notifying the outside when the first flow rate and the second flow rate are out of the respective allowable ranges.
7. A method for measuring a liquid medicine level using the method for measuring a density of a liquid medicine according to claim 5 or 6,
comprises the steps of calculating the density of the liquid medicine by using the following formula 1, and calculating the water level of the liquid medicine by using the following formula 2 based on the density of the liquid medicine:
[ EQUATION 1 ]
In formula 1, ρ is density, g is gravitational acceleration, △ P is the difference between the first pressure and the second pressure, △ H is the first distance;
[ equation 2 ]
In equation 2, H is a water level of the chemical solution, ρ is a density, g is a gravitational acceleration, and P2 is a second pressure at which the gas discharged from the second inflow pipe pushes the chemical solution at the second position.
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| KR10-2016-0085779 | 2016-07-06 | ||
| KR1020160085779A KR101862830B1 (en) | 2016-07-06 | 2016-07-06 | System and Method for for measuring density of chemical solution and Measuring method for level of chemical solution using the same |
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| KR20210116180A (en) | 2020-03-16 | 2021-09-27 | 황건호 | Level measuring method using capacitance |
| KR20210116179A (en) | 2020-03-16 | 2021-09-27 | 황건호 | Level measuring apparatus using capacitance |
| KR102417748B1 (en) * | 2021-01-13 | 2022-07-07 | 엘지전자 주식회사 | Apparatus for sensing oil of compressor and compressor having this |
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| JP2789058B2 (en) * | 1989-03-31 | 1998-08-20 | コミッサレ・ア・レナジイ・アトミック | Liquid density and level measuring device |
| JP2010008122A (en) * | 2008-06-25 | 2010-01-14 | Panasonic Electric Works Co Ltd | Gas sensor |
| JP2010164411A (en) * | 2009-01-15 | 2010-07-29 | Citizen Watch Co Ltd | Thin film gas sensor |
| CN104204792A (en) * | 2012-01-27 | 2014-12-10 | Abb技术有限公司 | Acoustic method and device for measuring a fluid density or a fluid viscosity |
| CN104237066A (en) * | 2014-09-26 | 2014-12-24 | 哈尔滨东安发动机（集团）有限公司 | Method for measuring density of object |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2376080B (en) | 2001-05-30 | 2004-08-04 | Micro Motion Inc | Flowmeter proving device |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2789058B2 (en) * | 1989-03-31 | 1998-08-20 | コミッサレ・ア・レナジイ・アトミック | Liquid density and level measuring device |
| JP2010008122A (en) * | 2008-06-25 | 2010-01-14 | Panasonic Electric Works Co Ltd | Gas sensor |
| JP2010164411A (en) * | 2009-01-15 | 2010-07-29 | Citizen Watch Co Ltd | Thin film gas sensor |
| CN104204792A (en) * | 2012-01-27 | 2014-12-10 | Abb技术有限公司 | Acoustic method and device for measuring a fluid density or a fluid viscosity |
| CN104237066A (en) * | 2014-09-26 | 2014-12-24 | 哈尔滨东安发动机（集团）有限公司 | Method for measuring density of object |
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| KR20180005792A (en) | 2018-01-17 |
| CN107589042A (en) | 2018-01-16 |
| KR101862830B1 (en) | 2018-05-31 |
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