KR100437662B1 - System, having multiple functions, for agitating, measuring and analyzing solution - Google Patents

Abstract

The present invention selects at least one or more of hydrogen ion concentration, dissolved oxygen concentration, electrical conductivity, temperature, and ion concentration at each set time while maintaining the temperature and agitation speed set by the user and simultaneously measuring the temperature and then measuring each The present invention relates to a multifunctional stirring measurement analysis system for comprehensively analyzing and outputting values.

To this end, the present invention, at least one or more measuring means for measuring the hydrogen ion concentration, dissolved oxygen concentration, electrical conductivity, temperature, one or more ion concentration, a temperature maintaining apparatus for maintaining a constant temperature, and a measurement material Multifunction including a stirrer for agitating, and a central analysis system for comprehensively analyzing and outputting the measured values output from each measuring means, the temperature maintaining device and the stirrer to maintain a predetermined temperature and stirring speed, respectively Agitation measurement analysis system is provided.

Therefore, the present invention can simultaneously measure the necessary data for each time set by the user while automatically maintaining the temperature and the stirring speed set by the user.

Description

Multifunction Stirring Analysis System {SYSTEM, HAVING MULTIPLE FUNCTIONS, FOR AGITATING, MEASURING AND ANALYZING SOLUTION}

The present invention relates to a basic experiment analysis equipment for chemical experiments, in particular hydrogen ion concentration (pH), dissolved oxygen concentration (DO; Dissolved Oxygen), electrical conductivity (Conductivity) for each set time while maintaining the temperature and stirring speed set by the user The present invention relates to a multi-function stirring measurement analysis system that selects at least one or more of temperature, ion concentration, and simultaneously measures the temperature and ion, and then analyzes and outputs each measurement value.

In general, when a chemical substance of a liquid substance is to be analyzed, a target is placed in a beaker, the temperature is adjusted, and then a desired stirrer is performed using a stirrer.

However, the general stirrer has a function that can be heated to raise the temperature to a proper temperature, but does not have a function of lowering the temperature when the temperature is higher than the proper temperature.

Therefore, in order to lower the temperature or to precisely control the temperature, a test apparatus for a hot bath called a water bath is used, which has the same size as a refrigerator of 80 liters.

After this process, pH, ion concentration, temperature, dissolved oxygen, electrical conductivity, salinity, total dissolved solid (TDS), etc. are measured. The sensor's output compensation for changes is the most important. Therefore, maintaining the correct temperature is the most desirable method for the most accurate experiment.

However, when trying to measure the rate of change of various data, there is no way to analyze the most important material analyte at the same time. At present, each measurement item is measured using each machine, and the data collected and synthesized on a computer are analyzed individually.

Therefore, the experimenter has no choice but to accept the experimental error that occurs during the repeated experiments. In addition, since one or more equipments must be used at each time since various measurements cannot be made at the same time, the reliability of the experiment is lowered due to errors occurring during repeated experiments, and the waste of time is caused. There is this.

In addition, due to the noise generated between the measuring equipment there is a problem that can not integrate several measuring equipment into a single device.

The present invention has been made to solve this problem, the present invention by measuring the data for each time set by the user while maintaining the temperature and stirring speed set by the user, by analyzing one or more measurement data at the same time as the experiment Its purpose is to provide a multifunctional stirring measurement analysis system.

Another object of the present invention is to provide a multifunctional stirring measurement analysis system that is integrated and miniaturized in one equipment by eliminating the mutual interference generated when the simultaneous measurement using a plurality of measuring means.

Still another object of the present invention is to provide a multifunctional stirring measurement analysis system for outputting measured temperature data.

In one embodiment of the present invention, in order to achieve the above object, the measurement material is stirred while maintaining a predetermined temperature, and at least one of hydrogen ion concentration, dissolved oxygen concentration, electrical conductivity, and one or more ion concentrations is selected. By measuring the temperature at the same time, and then provides a multi-function stirring measurement analysis system for comprehensive analysis of each measured value and output.

The multi-function stirring measurement analysis system includes at least one measuring means for measuring hydrogen ion concentration, dissolved oxygen concentration, electrical conductivity, temperature, one or more ion concentration, respectively; A temperature holding device for maintaining a constant temperature; A stirring device for stirring the measurement material; And a central analysis system configured to comprehensively analyze and output the measured values output from the respective measuring means, and to control the temperature maintaining apparatus and the stirring apparatus to maintain a preset temperature and a stirring speed, respectively.

The temperature maintaining device includes a support plate on which a measuring device containing a measurement material is placed; A heat transfer unit for heating the support plate according to a control signal output from the central analysis system; A cooling unit cooling the support plate according to a supply power; And a variable power supply unit supplying power to the cooling unit according to the control signal output from the central analysis system.

The stirring device includes a motor driving unit for outputting a driving signal in accordance with a control signal output from the central analysis system; A motor unit rotating in accordance with a drive signal output from the motor driving unit; A stirring magnet part rotating in combination with the rotation shaft of the motor part and dissipating magnetic force; Is inserted into the measuring mechanism, characterized in that it comprises a stirring medium to rotate by the magnetic force of the stirring magnet portion.

The central analysis system includes an input device for receiving a measurement item, a temperature, a stirring speed from the user; A sub-processing apparatus for converting the analog measurement values of the respective measuring means into digital values and outputting the digital values; A central processing unit controlling the temperature maintaining device and the stirring device to maintain a predetermined temperature and a stirring speed, respectively, and comprehensively analyzing the digital measurement values output from the sub-processing device; A display device for outputting a comprehensive analysis processing result from the central processing unit; It characterized in that it comprises a power supply for supplying power.

The central processing plant includes a storage means for storing the comprehensive analysis processing results for each unit of measurement time set by the user, and receives the hydrogen ion concentration measurement value output from the sub-processing unit as a hydrogen ion concentration value at the measurement temperature. Correcting and outputting, and receiving the electrical conductivity measurement value output from the sub-processing apparatus, characterized in that for correcting the electrical conductivity value at a predetermined temperature and outputs.

The central processing unit is characterized by controlling the temperature change of the temperature holding device by calculating the proportional integral derivative.

The central analysis system includes a communication support device for supporting communication with an external device; It further comprises an external output port for transmitting and receiving data with the external device.

The sub-processing apparatus comprises: a first measurement processing apparatus for converting a digital signal into a digital value after removing and amplifying a voltage signal input from the hydrogen ion concentration measuring means; A second measurement processing device for amplifying and converting a current signal input from the dissolved oxygen concentration measuring means, converting the digital signal into a digital value and outputting the digital signal to the central processing unit; A third measurement processing device for converting the reference voltage supplied to the conductivity measurement means and the measurement voltage applied to the conductivity measurement means into digital values and outputting the digital values to the central processing unit; A fourth measurement processing device converting the voltage signal input from the temperature measuring means into a digital value and outputting the digital signal to the central processing unit; And a fifth measurement processing device which converts the voltage signal inputted from the ion measuring means into noise and amplifies the digital signal and outputs the digital signal to the central processing unit.

The first measurement processing device includes a first filter unit for removing noise of an analog voltage signal input from hydrogen ion concentration measuring means; A first amplifier for high impedance amplifying the filtered analog voltage signal; A first A / D converter converting the amplified voltage signal into a digital value; And first processing means for reading the measured value over a predetermined number of times and calculating the average value, and outputting the average value to the central processing unit.

The second measurement processing device includes a first current amplifier for automatically compensating for the zero point of the current input from the dissolved oxygen concentration measuring means; A second current amplifier for amplifying the analog current inputted from the dissolved oxygen concentration measuring means and outputting it as a voltage; A second filter unit which removes noise of a signal amplified by the first current amplifier or the second current amplifier; A second A / D converter converting the amplified voltage value into a digital value; And second processing means for reading the measured value more than a predetermined number of times and calculating the average value, and outputting the average value to the CPU.

The third measurement processing device includes an oscillator for generating a sine wave; A variable amplifier for amplifying the voltage output from the oscillator according to an external voltage control signal; A third current amplifier for amplifying the voltage signal amplified by the variable amplifier; A multiplexer unit for selecting one of resistance paths connected to the third current amplifier unit according to an external selection signal; A third A / D converter converting the reference voltage output from the third current amplifier and the measured voltage applied to the electric conductivity measuring means into a digital value; A voltage control signal for controlling the voltage amplification of the variable amplifier and a selection signal for controlling the voltage applied to the electric conductivity measuring means to be in a predetermined range, and the reference voltage value and the measured voltage value are preset for a predetermined number of times. Third processing means for reading the average value and outputting the average value to the central processing unit; And a D / A converter converting the voltage control signal output from the third processing means into an analog signal and outputting the analog signal to the variable amplifier.

The CPU may be a voltage division method of calculating electrical conductivity using a reference voltage output from the third current amplifier and a measured voltage applied to an output terminal of the multiplexer.

The fourth measurement processing apparatus includes: a fourth A / D converter for converting an analog voltage signal input from a temperature measuring means into a digital value; And fourth processing means for reading the digital value measured more than a predetermined number of times, calculating an average value, and outputting the average value to the CPU.

The fifth measurement processing device includes a filter unit for removing noise of an analog signal input from an ion measuring unit; A fifth amplifier for high impedance amplifying the filtered analog signal; A fifth A / D converter converting the amplified signal into a digital value; And fifth processing means for reading out the measured value more than a predetermined number of times, calculating the average value, and outputting the average value to the CPU.

The central processing unit is insulated and in communication with each of the measurement processing units by using a photo coupler, and the power supply unit supplies separate power to the central processing unit and each of the measurement processing units.

Figure 1a is a block diagram showing an embodiment of a multifunctional stirring measurement analysis system according to the present invention,

1b to 1d is a front view, a side view, a rear view of the multifunctional stirring measurement analysis system,

FIG. 1E is a diagram illustrating an input device and a display device of FIG. 1A.

2A and 2B are views for explaining a temperature holding device and a stirring device of the multifunctional stirring measurement analysis system,

FIG. 3A is a block diagram of the sub processing apparatus shown in FIG. 1A;

3B to 3F are block diagrams of each of the first to fifth measurement processing apparatuses.

<Description of the symbols for the main parts of the drawings>

100: temperature maintaining device 200: stirring device

300: central analysis system 310: input device

320: sub-processing unit 330: central processing unit

332: storage means 340: power supply device

350: communication support device 360: display device

400: measuring means 410: hydrogen ion concentration measuring means

420: dissolved oxygen concentration measuring means 430: electrical conductivity measuring means

440: temperature measuring means 450: ion concentration measuring means

500: Multifunctional stirring measurement analysis system 600: External device

The objects, features and advantages of the present invention will be more readily understood by reference to the accompanying drawings and the following detailed description.

According to the present invention, at least one of hydrogen ion concentration, dissolved oxygen concentration, electrical conductivity, and one or more ion concentrations is selected at each time set by the user while maintaining the temperature and stirring speed set by the user, and measured simultaneously with the temperature. Next, a multifunctional stirring measurement analysis system for comprehensively analyzing and outputting each measurement value is proposed as a preferred embodiment.

Figure 1a is a block diagram showing an embodiment of a multifunctional stirring measurement analysis system according to the present invention, Figures 1b to 1d is a front view, a side view, a rear view of the multifunction stirring measurement analysis system, Figure 1e 1A is a diagram illustrating an input device and a display device.

Referring to FIG. 1, the multifunction stirring measurement analysis system 500 includes at least one measuring means 400 for measuring hydrogen ion concentration, dissolved oxygen concentration, electrical conductivity, temperature, and one or more ion concentrations, respectively, and The temperature maintaining device 100 for maintaining the temperature, the stirring device 200 for stirring the measurement material, and the total value of the measured value output from each measuring means 400 and outputs, the temperature maintaining device 100 And a central analysis system 300 for controlling the stirring device 200 to maintain the preset temperature and stirring speed, respectively.

The hydrogen ion concentration measuring unit 410 is an electrode for generating a voltage signal proportional to the hydrogen ion concentration, and the electrical conductivity measuring unit 430 is an electrode including a cell for measuring the electrical conductivity.

The dissolved oxygen concentration measuring unit 420 receives a predetermined voltage and supplies a predetermined oxygen concentration measuring sensor 422 for generating a voltage signal proportional to the dissolved oxygen concentration and a dissolved oxygen concentration measuring sensor 422. It is an electrode including a voltage unit 424.

The temperature measuring means 440 includes a sensor for measuring the temperature.

The ion concentration measuring means 450 is an electrode for generating a voltage signal proportional to a specific ion concentration. Specifically, it is preferable to use an ion selective electrode (ISE) that measures the concentration of ions using a polymer membrane that passes only specific ions. For example, ^Cl-film electrode used to measure only the Cl ^- it is possible to measure the concentration because it generates a voltage proportional to ^- and only pass, Cl.

The central analysis system 300 is an input device 310 for receiving a measurement item, a temperature, and a stirring speed from a user, and a sub-processing device 320 for converting and outputting an analog measurement value of each measurement means 400 into a digital value. And a central processing unit 330 for controlling the temperature maintaining device 100 and the stirring device 200 to maintain the preset temperature and the stirring speed, respectively, and comprehensively analyzing the digital measurement values output from the sub-processing device 320. ), A display device 360 for outputting a comprehensive analysis processing result from the central processing unit 330, and a power supply device 340 for supplying power.

The central analysis system 300 further includes a communication support device 350 supporting communication with the external device 600, and external output ports 391 and 392 capable of transmitting and receiving data with the external device 600.

The central processing unit 330 includes a storage means 332 for storing the comprehensive analysis processing results for each unit of time set by the user.

In addition, the central processing unit 330 corrects the hydrogen ion concentration measurement value output from the sub-processing unit 320 to the hydrogen ion concentration value at the measurement temperature, and outputs the electrical conductivity output from the sub-processing unit 320. The value is corrected to the conductivity value at a predetermined temperature and output.

Further, the central processing unit 330 controls the temperature change of the temperature maintaining device 100 by calculating the proportional integral derivative.

The power supply unit 340 supplies separate power to each measurement processing unit (321 to 325 of FIG. 3A) included in the central processing unit 330 and the sub processing unit 320, and a DC-DC conversion circuit. (DC-to-DC Converter) is proposed as a preferred embodiment.

2A and 2B are views for explaining a temperature holding device and a stirring device of the multifunctional stirring measurement analysis system. 1A and 2, the temperature maintaining apparatus 100 heats the support plate 140 according to a control plate output from the central analysis system 300 and a support plate 140 on which a measuring instrument containing a measurement material is placed. The heating unit 110, the cooling unit 120 for cooling the support plate in accordance with the supply power, and the variable power supply unit 130 for supplying power to the cooling unit 120 in accordance with the control signal output from the central analysis system 300 It includes.

The stirring device 200 includes a motor driver 210 outputting a drive signal according to a control signal output from the central analysis system 300, and a motor unit 220 rotating according to a drive signal output from the motor driver 210. And, combined with the rotating shaft of the motor unit 220, and rotates, the stirring magnet portion 230 for emitting a magnetic force, and the stirring medium 240 is inserted into the measuring mechanism to rotate by the magnetic force of the stirring magnet portion 230 It includes.

FIG. 3A is a block diagram of the sub-processing apparatus shown in FIG. 1A. Referring to FIGS. 1A and 3A, the sub-processing apparatus 320 removes noise and amplifies a voltage signal input from the hydrogen ion concentration measuring means 410. After the first measurement processing unit 321 to convert the digital value and output to the central processing unit 330 and the dissolved oxygen concentration measuring means 420, the current signal is amplified and converted to a digital value Converting the reference voltage supplied to the second measurement processing unit 322 and the electrical conductivity measuring unit 430 and the measured voltage applied to the electrical conductivity measuring unit 430 into digital values The third measurement processing unit 323 outputting to the central processing unit 330 and the fourth measurement processing unit converting the voltage signal input from the temperature measuring unit 440 into a digital value and outputting the digital signal to the central processing unit 330. 324, ion concentration measurement The voltage signal input from the end 450 after noise removal and amplification and conversion to a digital value and a fifth measurement processing unit 325 to output to the central processing unit 330.

3B to 3F are block diagrams of each of the first to fifth measurement processing apparatuses.

The first measurement processing unit 321 includes a first filter unit 321-1 for removing noise of the analog voltage signal input from the hydrogen ion concentration measuring unit 410, and a high impedance amplification filter for the filtered analog voltage signal. 1 amplifying unit 321-2, a first A / D converting unit 321-3 for converting the amplified voltage signal into a digital value, and a measured value more than a predetermined number of times, and calculating a mean value, followed by central processing. First processing means 321-4 output to the apparatus 330.

The central processing unit 330 performs insulated communication with each measurement processing unit 321 to 325 using the photocoupler 334.

The second measurement processing apparatus 322 includes a first current amplifier 322-1 for automatically compensating the zero point of the current input from the dissolved oxygen concentration measuring means 420, and an input from the dissolved oxygen concentration measuring means 420. The second current amplifier 322-2, which amplifies the analog current and outputs the voltage, removes noise of the signal amplified by the first current amplifier 322-1 or the second current amplifier 322-2. The second filter unit 322-3, the second A / D converter unit 322-4 which converts the amplified voltage value into a digital value, and the measured value more than a predetermined number of times, and then calculates an average value. And second processing means (322-5) output to the central processing unit (330).

The first current amplifier 322-1 uses a chopper operational amplifier, and the second current amplifier 322-2 uses a Y-Δ (delta) conversion current amplifier circuit. Do.

The third measurement processing apparatus 323 includes an oscillator 323-1 for generating a sine wave, a variable amplifier 323-3 for amplifying a voltage output from the oscillator 323-1 according to an external voltage control signal, One of a third current amplifier 323-4 for amplifying the voltage signal amplified by the variable amplifier 323-3 and a resistance path connected to the third current amplifier 323-4 according to an external selection signal. A third A / D for converting the reference voltage output from the third current amplifier 323-4 and the measured voltage applied to the electric conductivity measuring means 430 into a digital value. Outputs a voltage control signal for controlling the voltage amplification of the converter 323-6, the variable amplifier 323-3, and a selection signal for controlling the voltage applied to the conductivity measuring means 430 to be in a predetermined range. The CPU 330 reads the reference voltage value and the measured voltage value more than a predetermined number of times and calculates an average value. A third processing means 323-7 for outputting and a D / A converter for converting the voltage control signal output from the third processing means 323-7 into an analog signal and outputting the analog signal to the variable amplifier 323-3. 323-2.

The present invention uses a voltage division method for calculating electrical conductivity using a reference voltage output from the third current amplifier 323-4 and a measured voltage applied to the output terminal of the multiplexer 323-5.

The fourth measurement processing unit 324 includes a fourth A / D converter 324-1 for converting an analog voltage signal input from the temperature measuring unit 440 into a digital value, and a digital value measured more than a predetermined number of times. And fourth processing means 324-2 which reads the average value and outputs the average value to the central processing unit 330.

The fifth measurement processing apparatus 325 includes a third filter unit 325-1 for removing noise of the analog signal input from the ion concentration measuring unit 450, and a fifth amplifier unit for high impedance amplifying the filtered analog signal. 325-2, a fifth A / D converter 325-3 for converting the amplified signal into a digital value, and a central processing unit 330 after reading the measured value more than a predetermined number of times and calculating an average value. And fifth processing means (325-4) for outputting.

In the present invention configured as described above, the multifunctional stirring measurement analysis system will be described in detail with reference to Figures 1 to 3 while maintaining the experimental temperature and the stirring speed set by the user, while simultaneously analyzing the various measurement items. same.

First, the user puts the measurement material to be analyzed in the experimental beaker 20 and put it on the support plate 140. In this embodiment, a support plate made of aluminum is used.

The right side of the multifunction stirring measurement analysis system 500 is provided with a port 370 to connect each measurement means 400 using a BNC (Bayinet-Neil-Concelman) jack.

Then, after each measuring means 400 is mounted on the circular electrode holder 10, the test preparation is completed by placing the lid on the experimental beaker 20 as if it is covered.

Meanwhile, before performing the assay, calibration of each measuring means 400 should be carried out. The hydrogen ion concentration measuring means 410 has a pH of 0.40 and 7.00 and 10.00, respectively, in a range of ± 0.4 mV. You can calibrate it for more than 60 seconds.

The electrical conductivity measuring means 430 does not need a separate zero calibration, and once a year or zero calibration of the producer or after measuring the accuracy through the standard solution, if the error occurs zero calibration to the manufacturer.

The zero point correction of the dissolved oxygen concentration measuring means 420 is performed by putting the dissolved oxygen concentration measuring means 420 into water saturated with an aeration tank for about one hour.

In this way, after the correction for each measuring means 400, a predetermined temperature or a temperature change range is set. And, by setting the measurement time and the end conditions, etc. to collect the measurement data and pressing the start button (not shown), the data measured through each measuring means 400 until the end point is synthesized in the central processing unit 330 It is analyzed and stored in the storage means 332. The storage means 332 stores the measured data for each measurement unit time. For example, when the measurement unit time is 1 second, the storage unit 332 has a capacity to store the data for 30 days or longer.

Data stored in the storage means 332 may be directly monitored by an external device 600 such as a PC, or may be displayed as a graph on its display device 360.

Referring to FIG. 1E, there are function keys F1, F2, F3, and F4 on the right side of the display device 360, and an operation key on the bottom thereof. The function key is a graphic corresponding key for assigning a key added to the function to the screen, and the key at the bottom is the minimum required key for using the device.

The Menu key is used when a key of the graphic screen is to be used or when the user wants to return to the previous screen from the current operation state.

The CAL key is for zero calibration, and the SET key is for user setting. There is a key for selecting the up or down direction, an enter key, an esc key for returning, and a shift key for shifting.

Now, when the user presses the start button to describe the operation process after starting the analysis experiment is as follows.

In order to maintain the temperature set by the user, the temperature maintaining apparatus 100 is heated using the heat transfer unit 110 built in the support plate 140, and uses the cooling unit 120 attached to the bottom of the support plate 140. To cool.

All of these controls are performed by a proportional integral differential (PID) control program built in the central processing unit 330. The variable power supply unit 130 is program-variable under control from the central processing unit 330 and supplies a voltage of 12 to 24V to the cooling unit 120. The electronic cooling element is used as the cooling unit 120, and its output varies according to the voltage and current supplied from the variable power supply unit 130, and precise temperature control is performed between 6 and 100 degrees (° C).

In order to ventilate the elevated internal air, the multifunctional stirring measurement analysis system 500 is provided with a vent 380 on the side.

In the stirring device 200 for stirring the measurement material, a circular stirring magnet part 230 is connected to the shaft of the motor part 220. The motor driver 210 outputs a drive signal to the motor unit 220 according to a control signal output from the central analysis system 300, and the motor unit 220 rotates according to the drive signal output from the motor driver 210. do. The motor unit 220 proposes to use a stepping motor as a preferred embodiment.

Then, when the stirring medium 240 composed of the N pole and the S pole like the normal magnet is inserted into the experimental beaker 20, the stirring magnet unit 230 connected to the motor unit 220 rotates, and thus the experimental beaker 20 In the stirring medium 240, the solution is evenly mixed as it rotates.

Now, the measuring process using each measuring means 400 will be described.

First, when looking at the hydrogen ion concentration measurement means 410 in terms of electrical, according to the acidity containing the hydrogen ion concentration measurement means 410 is 0.0 mV at pH 7.00, 59.16 based on 25 degrees (℃) at pH 1.00 increase mV decreases and 59.16 mV increases with a decrease of pH 1.00.

Since the voltage generated by the hydrogen ion concentration measuring means 410 is changed according to the hydrogen ion concentration of the solution, there is shaking, and due to the manufacturing characteristics of the electrode, it is a high resistance output of 10 ¹² Ω or more, so noise is easily induced.

Thus, the first amplifier 321 having an input impedance of 10E12 Ω or more so as to remove noise by using the first filter unit 321-1 passing only the low pass signal and not to generate an error when measuring the output voltage of the high output impedance. Must be amplified by -2).

In order to display the display accuracy of the pH to two decimal places, an A / D converter with a resolution of 59.16mV / 100 = 0.5916mV should be selected.

A minimum resolution of 0.1mV is realized by using the first A / D converter 321-3 having a resolution of 15 bits at a reference voltage of 2V.

The voltage thus obtained is calculated by the first processing means 321-4 or more (for example, five or more times) by the first processing means 321-4 to remove the fluctuation caused by thermal noise from the electronic device, and then calculates an average value. Insulated communication is performed through the photo coupler 334 to 330. It is preferable to use one chip cpu as the first processing means 321-4.

The power supply is supplied using the first power supply 341 of the insulated DC-DC converter circuit.

The central processing unit 330 converts and outputs in the following manner.

Slope at Current Temperature = 0.19842 × (Current Temperature + 273.16)

Reference voltage (K) = S × 7.00

pH = (K-measured voltage) / S

In the following description, each of the measurement processing devices 321 to 325 communicates with the central processing unit 330 using each photocoupler as described in the first measurement processing device, and each power supply device. Supply insulated power. For convenience of description, notation is omitted in FIGS. 3B to 3F.

Next, the process of measuring the dissolved oxygen concentration is as follows.

When a voltage of 0.6V to 0.7V is applied to the dissolved oxygen concentration measuring sensor 422 by using the voltage unit 424, a current of several nA to several tens nA is generated in proportion to the amount of oxygen dissolved in the measurement material. The key point is the I-V circuit, which converts this very small current into a voltage from 0.1mV to 2000.0mV capable of A / D conversion.

This very small current amplification generates a lot of circuit design errors, and when the current does not flow through the electrode, i.e., when the oxygen is zero, a general current amplifier circuit is unsuitable for measurement because of a lot of shaking. In general, current amplification circuits must use a resistor of 10 ⁹ 으로 as a feedback resistor. These resistors are not available and cannot be measured due to the noise generated in the high resistance.

Therefore, in the present invention, the first current amplifier 322-1 uses a chopper operational amplifier that automatically compensates the output to zero when the input is zero. In order to amplify 10 ⁹ times when converting a current of 1nA into 1V, a current amplifying circuit of a y-Δ (delta) conversion method is used as the second current amplifier 322-2. In this way, the measurement which shakes up substantially can be performed.

The amplified voltage is filtered by the second filter unit 322-3 and then converted into a digital value by the second A / D converter 322-4.

The second processing means 322-5 processes the average value of the data read more than a predetermined number of times, and performs the insulation communication through the photocoupler (not shown) to the central processing unit 330.

Next, the process of measuring the electrical conductivity is as follows.

Finding the electrical conductivity of a measurement material takes the inverse of the material by taking the inverse (G), which is proportional to the surface area (A) of the measurement terminal and inversely proportional between the electrodes (L).

That is, (A / L) × k = G, so

It is represented by electrical conductivity (k) = G × (L / A).

In general, the electric conductivity measurement is mainstream in order to avoid the polarization of the electrode surface. However, even when a constant current is used, an error occurs in current and resistance because it is eventually converted into voltage, and the length of the wire is included in the measured value when the measuring terminal becomes longer.

Thus, in the present invention, the length of the line is fixed, and the length of the line is compensated internally. Then, the voltage of the source source is made variable, and the reference resistance can be selected multiplely, thereby preventing polarization of the electrode surface. In addition, by reading and calculating the reference voltage V1 and the measurement voltage V2, the accuracy of the measurement is improved and the precision decrease due to disturbance is eliminated.

The sine wave output from the oscillator 323-1 is amplified by the variable amplifier 323-3 according to the voltage control signal output from the D / A converter 323-2. The voltage signal amplified by the variable amplifier 323-3 is amplified by the third current amplifier 323-4 and used as a reference voltage of the reference resistor.

Next, the third processing means 323-7 controls the multiplexer 323-5 so that the measured voltage V2 applied to the conductivity measuring means 430 is 1/5 to 1 of the reference voltage V1. Select the resistance (one of R1 to R4) at the time when it becomes / 2. The reference voltage V1 and the measurement voltage V2 are digitally converted by the third A / D converter 323-6.

Then, the third processing means 323-7 processes the average value of the data read more than a predetermined number of times, and performs insulated communication with the central processing unit 330 through a photocoupler (not shown).

The process of obtaining the electrical conductivity by the third processing means 323-7 with the reference voltage V1 and the measured voltage V2 is as follows.

The voltage Vx = V1-V2 applied to the reference resistance Rxn, and the current flowing through the electrical conductivity measuring means 430 is Ix = Vx / Rxn.

Therefore, the resistance value of the conductivity measuring means 430 is CRx = V2 / Ix,

The conductivity is cond = 1 / CRx.

Since the electrical conductivity of the solution varies greatly depending on the temperature, it is as follows when it is expressed in terms of 25 degrees (C) or 20 degrees (C).

Converted conductivity = cond / tcf

tcf = 1.0 + {tf × (temperature coefficient of matter / 100.0)}

tf = current temperature-25 degrees (℃)

The above cond becomes the final conductivity measurement.

Next, the process of measuring the temperature is as follows.

The analog voltage signal input from the temperature measuring means 440 is converted into a digital value by the fourth A / D converter 324-1, and then the fourth processing means 324-2 is read more than a predetermined number of times and averaged. After calculating the output to the central processing unit 330 through a photocoupler (not shown).

Next, the process of measuring the ion concentration is as follows.

The analog signal input from the ion concentration measuring means 450 is noise-removed by the third filter unit 325-1 and high impedance amplified by the fifth amplifier 325-2.

The amplified signal is converted into a digital value by the fifth A / D converter 325-3, and the fifth processing means 325-4 reads the measured value more than a predetermined number of times and calculates an average value. Output to device 330 through a photocoupler (not shown).

In order to measure various ions ISE1 to ISE5 as shown in FIG. 1C, a multiplexer is implemented in the fifth measurement processing device 325, but further ion concentration measurement may be possible depending on the system configuration. .

The central processing unit 330 stores the measured data in the storage means 332 (30 days per second), and when the user is set to the external device 600 RS232C port 391 or USB (Universal Serial) Bus can transmit directly via the port 392).

The data received by the external device 600 may be easily analyzed and processed by a user by using an Excel or a function conversion program built in the external device 600.

On the other hand, the central processing unit 330 can be obtained by multiplying the electrical conductivity of 0.6 ~ 0.7 by measuring the total amount of the total solids dissolved in the water. In addition, the potential difference between + and − ions may be comprehensively measured using an Oxidation Reduction Potential (ORP) electrode having a different measurement voltage depending on the amount of + and − ions in water.

The present invention is not limited to the embodiments described above, and various modifications and changes can be made by those skilled in the art, which are included in the spirit and scope of the present invention as defined in the appended claims.

As described above, the present invention, while automatically maintaining the temperature and the stirring speed set by the user, simultaneously measures the necessary data for each time set by the user and transmits to the PC. And, by displaying the measured value on the display device provided in the analysis device itself, it is possible to improve the reliability and accuracy of the analysis experiment.

In addition, since it is possible to measure several items at the same time, it is possible to reduce the purchase cost of the various equipment required for the analysis experiment, and to simply operate without having to learn cumbersome operation methods for each equipment.

It is possible to measure and analyze various analytical experiments simultaneously through a single miniaturized device and provide accurate results, thereby providing a lot of convenience in basic scientific experimental analysis.

Claims (27)

delete delete delete delete delete delete delete delete delete delete While maintaining the preset temperature, the measurement material is stirred, and at least one of hydrogen ion concentration, dissolved oxygen concentration, electrical conductivity, and one or more ion concentrations is selected and measured simultaneously with the temperature, and then the respective measured values are measured. Multifunctional stirring measurement analysis system to output a comprehensive analysis, At least one measuring means for measuring hydrogen ion concentration, dissolved oxygen concentration, electrical conductivity, temperature, one or more ion concentrations, respectively; A temperature holding device for maintaining a constant temperature; A stirring device for stirring the measurement material; And a central analysis system for comprehensively analyzing and outputting the measured values output from the respective measuring means, and controlling the temperature maintaining apparatus and the stirring apparatus to maintain the preset temperature and the stirring speed, respectively. The central analysis system includes an input device for receiving a measurement item, a temperature, a stirring speed from the user; A sub-processing apparatus for converting the analog measurement values of the respective measuring means into digital values and outputting the digital values; A central processing unit controlling the temperature maintaining device and the stirring device to maintain a predetermined temperature and a stirring speed, respectively, and comprehensively analyzing the digital measurement values output from the sub-processing device; A display device for outputting a comprehensive analysis processing result from the central processing unit; It includes a power supply for supplying power, The central processing plant apparatus comprises a multi-function agitation measurement analysis system comprising a storage means for storing the result of the comprehensive analysis processing for each unit of time set by the user. While maintaining the preset temperature, the measurement material is stirred, and at least one of hydrogen ion concentration, dissolved oxygen concentration, electrical conductivity, and one or more ion concentrations is selected and measured simultaneously with the temperature, and then the respective measured values are measured. Multifunctional stirring measurement analysis system to output a comprehensive analysis, At least one measuring means for measuring hydrogen ion concentration, dissolved oxygen concentration, electrical conductivity, temperature, one or more ion concentrations, respectively; A temperature holding device for maintaining a constant temperature; A stirring device for stirring the measurement material; And a central analysis system for comprehensively analyzing and outputting the measured values output from the respective measuring means, and controlling the temperature maintaining apparatus and the stirring apparatus to maintain the preset temperature and the stirring speed, respectively. The central analysis system includes an input device for receiving a measurement item, a temperature, a stirring speed from the user; A sub-processing apparatus for converting the analog measurement values of the respective measuring means into digital values and outputting the digital values; A central processing unit controlling the temperature maintaining device and the stirring device to maintain a predetermined temperature and a stirring speed, respectively, and comprehensively analyzing the digital measurement values output from the sub-processing device; A display device for outputting a comprehensive analysis processing result from the central processing unit; It includes a power supply for supplying power, The central processing unit is a multi-function stirring measurement analysis system, characterized in that for receiving the hydrogen ion concentration measurement value output from the sub-processing unit, corrected by the hydrogen ion concentration value at the measurement temperature. While maintaining the preset temperature, the measurement material is stirred, and at least one of hydrogen ion concentration, dissolved oxygen concentration, electrical conductivity, and one or more ion concentrations is selected and measured simultaneously with the temperature, and then the respective measured values are measured. Multifunctional stirring measurement analysis system to output a comprehensive analysis, At least one measuring means for measuring hydrogen ion concentration, dissolved oxygen concentration, electrical conductivity, temperature, one or more ion concentrations, respectively; A temperature holding device for maintaining a constant temperature; A stirring device for stirring the measurement material; And a central analysis system for comprehensively analyzing and outputting the measured values output from the respective measuring means, and controlling the temperature maintaining apparatus and the stirring apparatus to maintain the preset temperature and the stirring speed, respectively. The central analysis system includes an input device for receiving a measurement item, a temperature, a stirring speed from the user; A sub-processing apparatus for converting the analog measurement values of the respective measuring means into digital values and outputting the digital values; A central processing unit controlling the temperature maintaining device and the stirring device to maintain a predetermined temperature and a stirring speed, respectively, and comprehensively analyzing the digital measurement values output from the sub-processing device; A display device for outputting a comprehensive analysis processing result from the central processing unit; It includes a power supply for supplying power, The central processing unit is a multi-function stirring measurement analysis system, characterized in that for receiving the electrical conductivity measurement value output from the sub-processing unit to correct the electrical conductivity value at a predetermined temperature. While maintaining the preset temperature, the measurement material is stirred, and at least one of hydrogen ion concentration, dissolved oxygen concentration, electrical conductivity, and one or more ion concentrations is selected and measured simultaneously with the temperature, and then the respective measured values are measured. Multifunctional stirring measurement analysis system to output a comprehensive analysis, At least one measuring means for measuring hydrogen ion concentration, dissolved oxygen concentration, electrical conductivity, temperature, one or more ion concentrations, respectively; A temperature holding device for maintaining a constant temperature; A stirring device for stirring the measurement material; And a central analysis system for comprehensively analyzing and outputting the measured values output from the respective measuring means, and controlling the temperature maintaining apparatus and the stirring apparatus to maintain the preset temperature and the stirring speed, respectively. The central analysis system includes an input device for receiving a measurement item, a temperature, a stirring speed from the user; A sub-processing apparatus for converting the analog measurement values of the respective measuring means into digital values and outputting the digital values; A central processing unit controlling the temperature maintaining device and the stirring device to maintain a predetermined temperature and a stirring speed, respectively, and comprehensively analyzing the digital measurement values output from the sub-processing device; A display device for outputting a comprehensive analysis processing result from the central processing unit; It includes a power supply for supplying power, The central processing unit is a multi-function stirring measurement analysis system, characterized in that for controlling the temperature change of the temperature maintaining device by calculating the proportional integral derivative coefficient. While maintaining the preset temperature, the measurement material is stirred, and at least one of hydrogen ion concentration, dissolved oxygen concentration, electrical conductivity, and one or more ion concentrations is selected and measured simultaneously with the temperature, and then the respective measured values are measured. Multifunctional stirring measurement analysis system to output a comprehensive analysis, At least one measuring means for measuring hydrogen ion concentration, dissolved oxygen concentration, electrical conductivity, temperature, one or more ion concentrations, respectively; A temperature holding device for maintaining a constant temperature; A stirring device for stirring the measurement material; And a central analysis system for comprehensively analyzing and outputting the measured values output from the respective measuring means, and controlling the temperature maintaining apparatus and the stirring apparatus to maintain the preset temperature and the stirring speed, respectively. The central analysis system includes an input device for receiving a measurement item, a temperature, a stirring speed from the user; A sub-processing apparatus for converting the analog measurement values of the respective measuring means into digital values and outputting the digital values; A central processing unit controlling the temperature maintaining device and the stirring device to maintain a predetermined temperature and a stirring speed, respectively, and comprehensively analyzing the digital measurement values output from the sub-processing device; A display device for outputting a comprehensive analysis processing result from the central processing unit; It includes a power supply for supplying power, The central analysis system includes a communication support device for supporting communication with an external device; Multifunctional stirring measurement analysis system further comprises an external output port for transmitting and receiving data with the external device. While maintaining the preset temperature, the measurement material is stirred, and at least one of hydrogen ion concentration, dissolved oxygen concentration, electrical conductivity, and one or more ion concentrations is selected and measured simultaneously with the temperature, and then the respective measured values are measured. Multifunctional stirring measurement analysis system to output a comprehensive analysis, At least one measuring means for measuring hydrogen ion concentration, dissolved oxygen concentration, electrical conductivity, temperature, one or more ion concentrations, respectively; A temperature holding device for maintaining a constant temperature; A stirring device for stirring the measurement material; And a central analysis system for comprehensively analyzing and outputting the measured values output from the respective measuring means, and controlling the temperature maintaining apparatus and the stirring apparatus to maintain the preset temperature and the stirring speed, respectively. The central analysis system includes an input device for receiving a measurement item, a temperature, a stirring speed from the user; A sub-processing apparatus for converting the analog measurement values of the respective measuring means into digital values and outputting the digital values; A central processing unit controlling the temperature maintaining device and the stirring device to maintain a predetermined temperature and a stirring speed, respectively, and comprehensively analyzing the digital measurement values output from the sub-processing device; A display device for outputting a comprehensive analysis processing result from the central processing unit; It includes a power supply for supplying power, The sub-processing apparatus comprises: a first measurement processing apparatus for converting a digital signal into a digital value after removing and amplifying a voltage signal input from the hydrogen ion concentration measuring means; A second measurement processing device for amplifying and converting a current signal input from the dissolved oxygen concentration measuring means, converting the digital signal into a digital value and outputting the digital signal to the central processing unit; A third measurement processing device for converting the reference voltage supplied to the conductivity measurement means and the measurement voltage applied to the conductivity measurement means into digital values and outputting the digital values to the central processing unit; A fourth measurement processing device converting the voltage signal input from the temperature measuring means into a digital value and outputting the digital signal to the central processing unit; And a fifth measurement processing device which converts the voltage signal inputted from the ion measuring means into noise and amplifies the digital signal and outputs the digital signal to the central processing unit. 17. The apparatus of claim 16, wherein the first measurement processing device A first filter unit for removing noise of the analog voltage signal inputted from the hydrogen ion concentration measuring means; A first amplifier for high impedance amplifying the filtered analog voltage signal; A first A / D converter converting the amplified voltage signal into a digital value; And a first processing means for reading the measured value more than a predetermined number of times and calculating the average value, and outputting the average value to the central processing unit. The method of claim 16, wherein the second measurement processing device A first current amplifier for automatically compensating for the zero point of the current inputted from the dissolved oxygen concentration measuring means; A second current amplifier for amplifying the analog current inputted from the dissolved oxygen concentration measuring means and outputting it as a voltage; A second filter unit which removes noise of a signal amplified by the first current amplifier or the second current amplifier; A second A / D converter converting the amplified voltage value into a digital value; And a second processing means for reading the measured value more than a predetermined number of times and calculating the average value, and outputting the average value to the central processing unit. The multifunction stirring measurement analysis system according to claim 18, wherein the first current amplifier is a chopper operational amplifier. The multifunction stirring measurement analysis system according to claim 18, wherein the second current amplifier is a Y-delta conversion method. 17. The apparatus of claim 16, wherein the third measurement processing device An oscillator for generating a sine wave; A variable amplifier for amplifying the voltage output from the oscillator according to an external voltage control signal; A third current amplifier for amplifying the voltage signal amplified by the variable amplifier; A multiplexer unit for selecting one of resistance paths connected to the third current amplifier unit according to an external selection signal; A third A / D converter converting the reference voltage output from the third current amplifier and the measured voltage applied to the electric conductivity measuring means into a digital value; A voltage control signal for controlling the voltage amplification of the variable amplifier and a selection signal for controlling the voltage applied to the electric conductivity measuring means to be in a predetermined range, and the reference voltage value and the measured voltage value are preset for a predetermined number of times. Third processing means for reading the average value and outputting the average value to the central processing unit; And a D / A converter converting the voltage control signal output from the third processing means into an analog signal and outputting the analog signal to the variable amplifier. 22. The system of claim 21, wherein said central processing unit is The multifunction agitation measurement analysis system, characterized in that the voltage division method for calculating the electrical conductivity using the reference voltage output from the third current amplifier and the measured voltage applied to the output terminal of the multiplexer. The method of claim 16, wherein the fourth measurement processing device A fourth A / D converter converting the analog voltage signal input from the temperature measuring means into a digital value; And a fourth processing means for reading the digital value measured more than a predetermined number of times, calculating an average value, and outputting the average value to the central processing unit. The method of claim 16, wherein the fifth measurement processing device A filter unit for removing noise of the analog signal input from the ion measuring unit; A fifth amplifier for high impedance amplifying the filtered analog signal; A fifth A / D converter converting the amplified signal into a digital value; And a fifth processing means for reading out the measured value more than a predetermined number of times, calculating an average value, and outputting the measured value to the central processing unit. 25. The system of claim 16, wherein the central processing unit Multifunctional stirring measurement analysis system, characterized in that the insulated communication with each of the measurement processing apparatus using a photo coupler. 25. The apparatus of claim 16, wherein the power supply is Multifunction stirring measurement analysis system, characterized in that for supplying separate power to the central processing unit and each of the measurement processing unit. 27. The apparatus of claim 26, wherein the power supply is Multi-function stirring measurement analysis system, characterized in that the DC-to-DC converter (DC-to-DC Converter).