KR101582098B1 - Concentrated liquid instrument using electromagnetic inductive conductivity sensors - Google Patents

Concentrated liquid instrument using electromagnetic inductive conductivity sensors Download PDF

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Publication number
KR101582098B1
KR101582098B1 KR1020150126807A KR20150126807A KR101582098B1 KR 101582098 B1 KR101582098 B1 KR 101582098B1 KR 1020150126807 A KR1020150126807 A KR 1020150126807A KR 20150126807 A KR20150126807 A KR 20150126807A KR 101582098 B1 KR101582098 B1 KR 101582098B1
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South Korea
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unit
signal
liquid
measurement
measuring
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KR1020150126807A
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Korean (ko)
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서인호
최연규
박규성
윤인준
지은정
서윤성
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대윤계기산업주식회사
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/023—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance where the material is placed in the field of a coil
    • G01N27/025—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance where the material is placed in the field of a coil a current being generated within the material by induction
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid

Abstract

The present invention relates to a device for measuring a high-concentrated fluid using an electromagnetic induction type electric conductivity (inductance) sensor including: a detection unit composed of a measurement holder formed into a linear pipe coming into direct contact with a fluid to be measured and a sensor composed of a drive coil generating signals by receiving AC voltages of a predetermined valve from a frequency generating device of a signals supplying unit and a pick-up coil generating AC voltages and inductive frequencies in accordance with the concentration of the fluid to be measured; and a measurement unit composed of a signal supplying unit applying the AC voltages with the frequencies at a predetermined valve to the drive coil of the detection unit, a signal acquisition unit acquiring the detected inductive frequencies and the AC voltages of the pick-up coil of the detection unit, a processor applying signals to the signal supplying unit and the signal acquisition unit, and calculating and controlling the same, a display showing the calculation result to the outside on a real time basis, and a control keypad inputting commands to make the processor to apply, calculate, and control signals. Accordingly, the present invention is capable of remarkably improving work efficiency and productivity for measuring harmful liquid such as hydrochloric acid, ammonia, caustic soda, and the like in a special industrial field such as a power plant and a chemical factory by using the inductance sensor with durability and corrosion resistance.

Description

[0001] The present invention relates to a high-concentration liquid measuring device using an electromagnetic induction type electrical conductivity sensor,

TECHNICAL FIELD The present invention relates to a high concentration liquid measuring device using an electromagnetic induction type conductivity (inductance) sensor, and more particularly, to a technique for measuring a concentration of a liquid by measuring a change amount of electromotive force of a conductive liquid passing through a sensor.

Generally, there are an electrode type conductivity measurement method and an electromagnetic induction type electrical conductivity (inductance) measurement method in measuring the concentration of a liquid.

Electrode type conductivity method is used in pure water, purified water process or laboratory with low conductivity. Inductance measurement method is less affected by error, corrosion and adhesion due to polarization phenomenon. Used extensively.

In addition, the inductance measuring method can be applied precisely and widely. However, since the concentration measuring apparatus using the inductance measuring method currently has a limited localization, it relies on foreign acid. Therefore, the measuring apparatus is expensive, heavy, There are many problems, such as not being able to develop products suitable for our industry is urgent.

Korean Patent Publication No. 10-2014-0126449 (October 31, 2014) Korean Patent Publication No. 10-2009-0017012 (2009.02.18.)

SUMMARY OF THE INVENTION An object of the present invention is to provide a cost-saving measuring instrument which is light, easy to operate, and less costly to a user.

Another object of the present invention is to provide an apparatus and a method for detecting a liquid to be measured, And a measurement unit connected to the detection unit, for calculating, setting, controlling, and transmitting the signal applied from the detection unit, and a measurement unit using the electromagnetic induction conductivity sensor.

It is a further object of the present invention to provide a high-concentration liquid measuring device using a measurement holder formed in an intuitive shape so that the liquid to be measured directly passes therethrough and an electromagnetic induction type conductivity sensor provided at a predetermined interval in the straight pipe of the measurement holder .

It is still another object of the present invention to provide a method of detecting a drive coil in which a detection unit receives an AC voltage of a predetermined frequency from a frequency generator of a signal supply unit and generates a signal and an induction frequency and an AC voltage, There is provided a high concentration liquid measuring device using an electromagnetic induction type conductivity sensor provided with a sensor formed of a pickup coil.

It is still another object of the present invention to provide a high concentration liquid measuring device using an electromagnetic induction conductivity sensor capable of measuring a liquid to be measured in a temperature range of -5 to 80 DEG C with a measuring range of 0 to 2,000 mS / .

It is still another object of the present invention to provide a high-concentration liquid measuring device using an electromagnetic induction electric conductivity sensor comprising a frequency generator for applying an AC voltage having a predetermined frequency to a drive coil of a detector, .

It is still another object of the present invention to provide an electromagnetic induction type electric power generating apparatus including a signal acquiring section including an amplifier for amplifying an induction frequency and an AC voltage detected from a pickup coil of a detecting section and an analog digital converter for converting an analog signal into a digital signal, And to provide a high concentration liquid measuring instrument using the conductivity sensor.

It is still another object of the present invention to provide a signal processing apparatus and a signal acquisition apparatus, which are directly coupled to a signal supply unit and a signal acquisition unit, and to which a signal is supplied to the signal supply unit and the signal acquisition unit, And a control keypad coupled to the processor, the control keypad inputting a command for the processor to apply, calculate, set, and control the signal, and a high concentration liquid meter using the electromagnetic induction conductivity sensor.

It is still another object of the present invention to provide a high concentration liquid measuring instrument using an electromagnetic induction electrical conductivity sensor comprising a data communication section for outputting analog signals and digital signals to the outside of the measurement section and a power supply section for applying power to the measurement instrument have.

Another object of the present invention is to provide a high concentration liquid measuring device using an electromagnetic induction type conductivity sensor in which an insulating device is installed between a data communication unit, a power supply unit, a signal supply unit, and a signal acquisition unit.

In order to achieve the above object, a high concentration liquid measuring device using the electromagnetic induction type conductivity sensor of the present invention comprises: a detecting part directly contacting a liquid to be measured; And a measuring unit connected to the detecting unit, for calculating, setting, controlling, and externally transmitting a signal applied from the detecting unit.

Another characteristic of the high concentration liquid measuring device using the electromagnetic induction type conductivity sensor according to the present invention is that the detecting part is provided with a measuring holder formed in an straight pipe shape so as to directly pass the liquid to be measured and a predetermined interval to the straight pipe of the measuring holder.

Another characteristic of the high-concentration liquid measuring device using the electromagnetic induction-type electrical conductivity sensor of the present invention is that the detector includes a drive coil for generating a signal by receiving an AC voltage of a predetermined value from a frequency generator of the signal supplying unit, And a pickup coil for detecting an induction frequency and an alternating voltage,

The detection portion includes an intimate inner wall of the measurement holder including a lining formed of an insulating material except for a portion where the drive coil and the pickup coil are provided.

These detectors are designed to measure the liquid to be measured in the temperature range of -5 ° C to 80 ° C with a measurement range of 0 to 2,000 mS / cm.

Another characteristic of the high concentration liquid measuring device using the electromagnetic induction type conductivity sensor of the present invention is that the measuring part includes a frequency generator for applying an AC voltage having a predetermined frequency to a drive coil of a detecting part and a signal supplying part composed of a voltage regulator .

Another feature of the high concentration liquid measuring device using the electromagnetic induction type conductivity sensor of the present invention is that the measuring part includes an amplifier for amplifying the induction frequency and the AC voltage detected by the pickup coil of the detecting part and an analog digital converter And a signal acquisition unit.

The measurement unit may include a processor directly coupled to the signal supply unit and the signal acquisition unit, for applying signals to the signal supply unit and the signal acquisition unit, for calculating and controlling signals, a display for real- And a control keypad coupled to the processor for inputting instructions to input, calculate, set and control the signal.

Another characteristic of the high concentration liquid measuring device using the electromagnetic induction type conductivity sensor of the present invention is that the measuring part includes a data communication part for externally outputting analog signals and digital signals and a power supply part for applying power to the measuring device.

The measuring unit is characterized in that an insulating device is installed between a data communication unit, a power supply unit, a signal supply unit, and a signal acquiring unit, which are respectively coupled to the processor.

This insulation device is characterized in that it is installed in a position where there is a possibility of being exposed to a dangerous voltage, or where it is necessary to remove noise and to prevent malfunction of the equipment or occurrence of measurement error.

As described above, the detecting portion of the present invention is applicable to strong alkali and strong acid which have high corrosiveness and exhibits accuracy within 2% (Reading).

The measurement range is 0 ~ 2,000 mS / cm, -5 ℃ ~ 80 ℃, it is possible to measure under the harsh conditions and it is possible to measure concentrations of hydrochloric acid, ammonia, caustic soda and brine at high concentration and can be used in a wide range of industries .

It is easy to check, correct and correct measurement condition, easy to replace sensor by measurement item, and can apply dual measurement method (residual chlorine, pH, temperature)

It simplifies the operation of the measuring device and makes it easy to move, so it is convenient to practice and work in schools and factories.

1 is a schematic structural view showing a high concentration liquid measuring device using the electromagnetic induction type conductivity sensor of the present invention.
Fig. 2 is a view showing the outer shape of the measuring section of the present invention. Fig.
3 is a view for explaining the measurement principle of the detection unit of Fig.
FIG. 4 is a graph showing the change in electric conductivity according to the temperature change according to the concentration of the liquid to be measured. FIG.

Specific features and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings.

FIG. 1 is a schematic structural view showing a high-concentration liquid measuring device using the electromagnetic induction-type conductivity sensor of the present invention. FIG. 2 is a diagram showing the outline of the measuring section of the present invention. And FIG. 4 is a graph showing the change in electric conductivity per 1 DEG C according to concentrations of caustic soda, sodium chloride and sulfuric acid as liquids to be measured.

1, the high concentration liquid measuring device using the electromagnetic induction type conductivity sensor of the present invention includes a detection unit 100 and a measurement unit 200. [

The detecting portion 100 including the electric conductivity sensor 120 is formed so that the liquid 101 to be measured is in direct contact with the liquid.

The detection unit 100 includes a measurement holder 110 formed in an intuitive shape so as to directly pass the liquid 101 to be measured and a measurement holder 110 installed at a predetermined interval in the straight pipe of the measurement holder 110, And a drive coil 120a that receives an AC voltage having a predetermined frequency from an oscillator 242 and generates a signal.

 The detecting unit 100 includes a pickup coil 120b for detecting an induction frequency and an alternating voltage that are converted according to the concentration of the liquid 101 to be measured.

The detecting unit 100 may be configured such that the inner wall of the measuring holder 110 provided with the sensor 120, that is, the drive coil 120a and the pickup coil 120b, except for the portion where the two coils 120a and 120b are installed And a lining 130 formed of an insulating material.

The detection unit 100 has a measurement range of 0 to 2,000 mS / cm, and is capable of measuring the liquid to be measured in a temperature range of -5 ° C to 80 ° C.

1 and 3, when the AC voltage having a predetermined frequency is applied to the drive coil 120a and the conductive liquid to be measured flows in the direction from A to B, And the induced current is detected by the pickup coil 120b.

In addition, the insulating material of the lining 130 of the detecting unit 100 is formed of a Teflon resin having high resistance to acid corrosion and corrosion.

The measuring unit 200 is connected to the detecting unit 100 and is configured to calculate a signal applied from the detecting unit 100, to perform setting control, and to transmit the signal to the outside.

The measuring unit 200 includes a frequency generator 242 and a voltage regulator 241 for applying an AC voltage having a predetermined frequency to the drive coil 120a of the detector 100, 240).

The measuring unit 200 includes an amplifier 252 for amplifying the induction frequency and the AC voltage detected from the pickup coil 120b of the detecting unit 100 and an analog-to-digital converter A / D converters 251).

The measuring unit 200 includes a processor 210 that is directly coupled to the signal supplying unit 240 and the signal obtaining unit 250 and that applies signals to the signal supplying unit 240 and the signal obtaining unit 250, ).

The measuring unit 200 may further include a display 320 coupled to the processor 210 for displaying the calculated result in real time to the outside, And a control keypad 200 for inputting a command.

The measuring unit 200 includes a data communication unit 270 for outputting an analog signal and a digital signal to the outside, and a power supply unit 280 for applying power to the measuring device.

The data communication unit 270 of the measuring unit 200 includes an analog signal output terminal 271 for outputting an analog signal of 4 to 20 mA and a digital signal communication terminal 272 for outputting a digital signal to the outside .

The measurement unit 200 includes an isolator 260 between the data communication unit 270, the power supply unit 280, the signal supply unit 240, and the signal acquisition unit 250, Is installed.

The isolator 260 isolates a detection signal that may be exposed to a dangerous voltage from the analog-to-digital converter 251 of the signal acquisition unit 250 and the processor 210, And separates the detection unit 100 from the measurement unit 200. [ This prevents the detecting unit 100 and the measuring unit 200 from being formed as a ground loop, thereby eliminating all noise from the detecting unit 100 and preventing malfunction of the equipment and occurrence of measurement errors.

100:
101: liquid to be measured
110: Measurement holder
120: Electrode
120a: drive coil
120b: pick-up coil
130: lining
200:
210: Processor (CPU)
220: Display
230: Control Keypad
240:
241: Voltage Regulator
242: Frequency generator (Oscillator)
250: Signal acquisition unit
251: Analog to Digital Converter (A / D Converter)
252: Amplifier
260: Isolator
270: Data transmission unit
271: Analog signal output terminal
272: Digital signal communication terminal
280: Power supply

Claims (5)

In a high concentration liquid measuring instrument using an electromagnetic induction type electrical conductivity sensor,
A detection unit (100) in which the liquid to be measured (101) directly contacts;
And a measuring unit 200 connected to the detecting unit 100 to calculate and control a signal applied from the detecting unit 100 and externally transmit an analog signal and a digital signal through the data transmitting unit 270 Lt; / RTI >
The detection unit 100 is configured to maintain the measurement range of the liquid 101 to be measured in the pipeline or the storage tank at 0 to 2,000 mS / cm and -5 to 80 ° C,
The measurement unit 200 includes a signal supply unit 240 including a frequency generator 242 and a voltage regulator 241 for applying an AC voltage having a predetermined frequency to the drive coil 120a of the detection unit 100, ,
An amplifier 252 for amplifying the induction frequency and the AC voltage detected from the pickup coil 120b of the detector 100 and an analog-to-digital converter 251 for converting the analog signal into a digital signal, ,
A processor 210 directly connected to the signal supply unit 240 and the signal acquisition unit 250 and applying signals to the signal supply unit 240 and the signal acquisition unit 250,
A display 320 connected to the processor 210 and displaying the computed result on the outside in real time,
A control keypad 200 connected to the processor 210 for inputting a command to apply, operate, set, and control a signal;
And a power supply unit 280 for applying power to the liquid measuring device,
An isolator 260 is provided between the data communication unit 270, the power supply unit 280, the signal supply unit 240, and the signal acquisition unit 250, which are respectively connected to the processor 210. [ High Concentration Liquid Meter Using Inductive Conductivity Sensor.
The method according to claim 1,
The detection unit 100 includes a measurement holder 110 formed in a straight tube shape to pass the liquid 101 to be measured,
A drive coil 120a which is installed at a predetermined interval in the straight pipe of the measurement holder 110 and generates a signal by receiving an AC voltage having a predetermined frequency from the frequency generator 242 of the signal supply unit 240, A sensor 120 formed of a pickup coil 120b for detecting a signal having a value higher than a set value at an induction frequency and an AC voltage converted according to the concentration of the liquid 101,
Wherein the inner wall of the inner tube of the measurement holder 110 includes a lining 130 coated with an insulating material on all portions except the portion where the two coils 120a and 120b are installed. High concentration liquid meter.
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KR1020150126807A 2015-09-08 2015-09-08 Concentrated liquid instrument using electromagnetic inductive conductivity sensors KR101582098B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101896277B1 (en) * 2017-12-27 2018-09-07 (주) 해리아나 Inductive conductivity sensor
US11340205B2 (en) 2019-01-24 2022-05-24 Hong Kong Applied Science And Technology Research Institute Co., Ltd. Systems and methods for determining concentrations of materials in solutions
KR20220126547A (en) * 2021-03-09 2022-09-16 한국원자력연구원 Method for Temperature Compensation by Controlling Frequency and Mutual Inductance Type Liquid Level Detector Using the Same

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KR100844025B1 (en) * 2008-04-25 2008-07-04 길주형 Signal conversion transmitter of medulla measurement sensor
KR20090017012A (en) 2007-08-13 2009-02-18 삼성전자주식회사 Apparatus and method for detecting particle and microorganism with electromagnetic induction
KR100968354B1 (en) * 2001-10-10 2010-07-06 라이프스캔, 인코포레이티드 Determination of sample volume adequacy in biosensor devices
KR101307298B1 (en) * 2011-10-24 2013-09-11 한국건설생활환경시험연구원 Concrete recovery water concentration measuring apparatus using inductance and measuring method using the same
KR20140126449A (en) 2013-04-23 2014-10-31 에스케이하이닉스 주식회사 Semiconductor device and method of manufacturing the same
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KR100968354B1 (en) * 2001-10-10 2010-07-06 라이프스캔, 인코포레이티드 Determination of sample volume adequacy in biosensor devices
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KR100844025B1 (en) * 2008-04-25 2008-07-04 길주형 Signal conversion transmitter of medulla measurement sensor
KR101307298B1 (en) * 2011-10-24 2013-09-11 한국건설생활환경시험연구원 Concrete recovery water concentration measuring apparatus using inductance and measuring method using the same
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101896277B1 (en) * 2017-12-27 2018-09-07 (주) 해리아나 Inductive conductivity sensor
US11340205B2 (en) 2019-01-24 2022-05-24 Hong Kong Applied Science And Technology Research Institute Co., Ltd. Systems and methods for determining concentrations of materials in solutions
KR20220126547A (en) * 2021-03-09 2022-09-16 한국원자력연구원 Method for Temperature Compensation by Controlling Frequency and Mutual Inductance Type Liquid Level Detector Using the Same
KR102503801B1 (en) 2021-03-09 2023-02-24 한국원자력연구원 Method for Temperature Compensation by Controlling Frequency and Mutual Inductance Type Liquid Level Detector Using the Same

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