• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Three electrodes which are in contact with the substance to be measured, and the three electrodes are electrodes for detecting electrical conductivity of the substance to be measured and two electrodes for supplying alternating current which are arranged at intervals on both sides of the electrode for detecting the electrical conductivity, respectively. And an alternating current in phase is supplied to the two alternating current supply electrodes. According to this electrical conductivity measuring apparatus, the electrical conductivity of the substance to be measured can be measured stably and with high accuracy in the absence of variation.
    公开号:KR20020011386A
    申请号:KR1020017013407
    申请日:2001-02-13
    公开日:2002-02-08
    发明作者:히고유우지
    申请人:하시모토 쯔토무；오르가노 가부시키가이샤；
    IPC主号:
    专利说明:

    Electrical conductivity measuring device {APPARATUS FOR MEASURING CONDUCTIVITY}
    [2] In particular, electrical conductivity is used as a measure for measuring the concentration of ions movable in an aqueous solution, and electrical conductivity measuring devices are mostly used for measuring ion concentration in an aqueous solution. In general, the electrical conductivity measuring device is configured to measure the increase and decrease of the ion concentration in the aqueous solution under measurement by measuring the resistance value between the electrode for detection and the electrode for current supply from the power supply.
    [3] That is, the conventional electrical conductivity measuring apparatus is comprised as shown in FIG. 9, for example. The electrical conductivity measuring device 101 shown in FIG. 9 supplies a power supply electrode with respect to the fluid to be measured 103 as a substance to be measured which flows into the insulated measuring tube 102 or is stored in the measuring tube 102. 104 and the electrode for electric conductivity detection 105 are spaced apart. The AC constant voltage is applied to the power supply electrode 104 via the amplifier 106 from a power supply (not shown), for example. The electric current from the electric conductivity detecting electrode 105 is output through the current amplifying amplifier 107 and provided for the measurement of the electric conductivity. The measuring tube 102 is an insulator (for example, at least in the electric conductivity measurement site). Vinyl chloride tube), but is usually in a substantially ground state (ground point 108) at any one of its extended installation sites.
    [4] In the electrical conductivity measuring device 101 configured as described above, since the resistance corresponding to the electrical conductivity of the fluid to be measured 103 exists between the electrodes 104 and 105, the electrical power from the power supply electrode 104 passes through the resistance. The minute current flowing through the conductivity detecting electrode 105 is amplified by the current amplifying amplifier 107, and the output value therefrom is measured as a value corresponding to the electrical conductivity of the fluid under test.
    [5] By the way, in the electrical conductivity measuring apparatus 101 which has the above structure, since the measuring tube 102 is substantially grounded at either of the extension installation site | parts, from the electrical conductivity detection electrode 105 The current flows to the current amplifying amplifier 107 side, and a smaller current also flows to the ground point 108 side. In other words, the leakage current is generated from the electrical conductivity detecting electrode 105 separately from the electrical conductivity measurement.
    [6] Since the position of the ground point 108 is inaccurate and the resistance value between the electrode 105 and the ground point 108 fluctuates, the minute current flowing in the meantime is returned to the current amplifying amplifier 107 through the earth, and thus the electrode ( The leakage current flowing from the 105 to the ground point 108 becomes a factor of varying the current detected from the electrode for electric conductivity detection 105. Therefore, the presence of such a leakage current lowers the measurement accuracy of the electrical conductivity. In addition, fluctuations in the leakage current cause not only a drop in the electrical conductivity measurement accuracy but also a fluctuation in the measured data of the electrical conductivity.
    [1] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrical conductivity measuring device, and more particularly, to an electrical conductivity measuring device capable of always stably and accurately measuring electrical conductivity of a substance to be measured.
    [22] 1 is a schematic configuration diagram of an electrical conductivity measurement apparatus according to a first embodiment of the present invention.
    [23] 2 is an exploded perspective view of an example in which an electrical conductivity measuring site of the electrical conductivity measuring apparatus according to the present invention is configured as an electrical conductivity meter.
    [24] 3 is an enlarged perspective view of an electrode for measuring electrical conductivity of the electrical conductivity meter of FIG. 2.
    [25] 4 is a schematic configuration diagram of an electrical conductivity measurement apparatus according to a second embodiment of the present invention.
    [26] 5 is an exploded perspective view of another example in which the electrical conductivity measurement site of the electrical conductivity measurement apparatus according to the present invention is configured as an electrical conductivity meter.
    [27] 6 is a chart showing the measurement results of the first embodiment.
    [28] 7 is a chart showing the measurement results of the second embodiment.
    [29] 8 is a chart showing the measurement results of the first comparative example.
    [30] 9 is a schematic configuration diagram of a conventional electrical conductivity measurement apparatus.
    [7] Therefore, it is an object of the present invention to provide an electrical conductivity measuring apparatus which can stably measure the electrical conductivity of a substance to be measured at all times without fluctuation, thereby enabling high precision measurement of electrical conductivity.
    [8] In addition, another object of the present invention is to enable high-precision measurement, so that even when the substance to be measured contains an organic substance or the like, in particular, it is possible to measure the electrical conductivity stably and accurately over time. There is.
    [9] In order to achieve the above object, the electrical conductivity measuring apparatus according to the present invention has three electrodes in contact with the substance to be measured, and the three electrodes are used for detecting the electrical conductivity of the substance to be measured and the electrode for detecting the electrical conductivity. It consists of two alternating current supply electrodes arranged at intervals on both sides, respectively, characterized in that the alternating current in phase is supplied to the two alternating current supply electrodes (first electrical conductivity). Measuring device). Although it is an aqueous solution generally as a to-be-measured substance, it can also be made into a gas object or slurry type as a measurement object.
    [10] In this first electrical conductivity measuring device, it is preferable that a constant voltage of the same potential is applied to the two alternating current supply electrodes, but the voltage applied to the two alternating current supply electrodes may be a different potential. Even in the latter case, however, the voltages applied to the respective alternating current supply electrodes are each a predetermined constant voltage.
    [11] In addition, the electrical conductivity measuring apparatus according to the present invention has three electrodes in contact with the substance to be measured, and the three electrodes are spaced apart from one of the electrode for detecting the electrical conductivity of the substance to be measured and the electrode for detecting the electrical conductivity. And an alternating current supplying electrode and a ground electrode arranged at an interval on the opposite side of the electrical conductivity detecting electrode (second electrical conductivity measuring device).
    [12] In this second electrical conductivity measuring device, it is preferable that a constant voltage is applied to the AC current supplying electrode.
    [13] In the first and second electrical conductivity measuring apparatuses described above, when an organic substance or the like is contained in the substance to be measured, in order to eliminate the influence of the electrical conductivity measurement by adhesion or adsorption on the electrode surface of the organic substance or the like. Can effectively utilize organic substance decomposition performance and super hydrophilicity based on the photocatalytic activity of titanium oxide.
    [14] That is, the structure in which the electrode surface was formed of the titanium oxide layer on the surface of the electrode main body in which the three electrodes are each made of a conductive metal can be adopted. In order to exert a photocatalytic activity on the titanium oxide layer, it is preferable to arrange the light irradiation means with respect to the titanium oxide layer. For example, the structure which has the substance storage space to be measured formed between the electrode surfaces of the said three electrodes, and the light irradiation means which irradiates light to each electrode surface can be employ | adopted.
    [15] In this electrical conductivity measuring apparatus, it is preferable that the light irradiated by the light irradiation means has a wavelength causing the photocatalytic activity of the titanium oxide layer. For example, light having a wavelength of about 300 to 400 nm can be used. As the light irradiation means, a light source constituting ultraviolet light irradiation means such as black light may be used directly, and a light guide member (for example, a tube made of an optical fiber or a light guide material) for guiding light from the light source as the light irradiation means. You can also use It is also possible to directly irradiate light from the light source and to add light from the light guide.
    [16] It is also possible to divide the storage medium to be measured by the light-transmitting body so that light from the light irradiation means is irradiated to the electrode surface through the light-transmitting body (for example, glass). In this case, when titanium oxide coating is applied to the surface of the substance to be measured on the space side (liquid surface) of the light-transmitter so that light can be transmitted, organic matters such as the organic material to the liquid level of the light-transmitter due to the superhydrophilicity and organic matter decomposition performance of the titanium oxide coating layer Attachment can also be prevented.
    [17] In addition, the electrode can be manufactured, for example, in the following manner. That is, a method of forming an electrode surface by providing a titanium oxide layer by surface treatment such as sputtering or plating on the surface of an electrode body made of a conductive metal, or of an electrode body made of titanium metal and comprising an electrode body It is a method of forming an electrode surface which consists of a titanium oxide layer by giving oxygen to a surface. As a method of imparting oxygen to form the titanium oxide layer, a method by air oxidation can be used in addition to the method by electrolysis.
    [18] In the first electrical conductivity measuring device according to the present invention as described above, an electrical conductivity detection electrode is disposed between two alternating current supply electrodes, and an alternating current in phase is supplied to the two alternating current supply electrodes. The electrical conductivity detecting electrode is electrically shielded by the two alternating current supplying electrodes on both sides with respect to any one of the grounding portions existing outside the portion where these three electrodes are disposed. Therefore, there is no resistance between the electrical conductivity detection electrode and the external ground portion, and substantially no leakage current flows during that time. As a result, the current for the electrical conductivity measurement can always be stably obtained from the electrode for electric conductivity detection, and the fluctuation | variation of the measured electrical conductivity is eliminated, and high precision electrical conductivity can be measured.
    [19] In the second electrical conductivity measuring apparatus according to the present invention, since an alternating current is supplied only to one of the electrodes disposed on both sides of the electrode for detecting electrical conductivity, the other electrode is grounded. By the electrode for electric conductivity detection arrange | positioned between both electrodes, it becomes what is called resistance division | segmentation. In addition, since a constant voltage is applied to the one electrode and the grounded electrode potential of the other electrode is always 0, in particular, the resistance of the electrode for detecting electrical conductivity and the grounded electrode can be fixed to a constant resistance substantially unchanged. Will be. Therefore, even if the measuring tube of electrical conductivity was grounded at any one extension installation site, it is forcibly grounded by the said other electrode to reach the ground point of the measuring tube, and the electric potential is forcibly zero at the electrode site | part. Because of this, there is no room for a highly variable resistance to enter between the electrode for detecting electrical conductivity and the measuring tube ground point. As a result, the current for electric conductivity measurement can always be stably obtained from the electrode for electric conductivity detection, and the fluctuation of the measured electric conductivity is eliminated, and high precision electric conductivity can be measured.
    [20] As described above, according to the electrical conductivity measuring device of the present invention, an AC current supply electrode, or an AC current supply electrode and a ground electrode are disposed on both sides of the electrode for electric conductivity detection, and the electrical conductivity is detected between the electrodes. Since the shielding electrode can be suitably electrically shielded with respect to the external ground, the disturbance does not occur in the measurement current drawn from the electrical conductivity detection electrode, so that the electrical conductivity of the substance under measurement is always stable. Can be measured with high accuracy.
    [21] In the first and second electrical conductivity measuring apparatuses, when an electrode having a titanium oxide layer is used on the surface, the titanium oxide layer is irradiated with light having an appropriate wavelength (for example, ultraviolet rays), thereby producing titanium oxide. The photocatalytic activity possessed is exerted to decompose organic matter in water in contact with the titanium oxide layer or in the vicinity of the layer, thereby preventing adhesion or adsorption to the titanium oxide layer. In addition, since a water film is first formed on the surface of the electrode by the superhydrophilic property of the titanium oxide layer, adhesion itself can be suppressed even if decomposition of organic matter is delayed, for example. Therefore, this electrode surface is always maintained in a desirable surface form without organic matter adhesion or adsorption, and the preferred surface form is always kept stable even without periodic cleaning or the like. Therefore, without cleaning the electrode surface regularly, it is possible to always measure the electrical conductivity with high accuracy and to ensure accurate reproducibility of the measurement accuracy.
    [31] EMBODIMENT OF THE INVENTION Below, preferred embodiment of this invention is described, referring drawings.
    [32] 1 shows an electrical conductivity measuring device according to a first embodiment of the present invention. In the electrical conductivity measuring device 31, the fluid to be measured (33) as the substance to be measured flowing into the insulated measuring tube 32 or stored in the measuring tube 32 is measured. Three electrodes 34, 35, 36 in contact with 33 are provided. The three electrodes are an electrical conductivity detecting electrode 34 for detecting electrical conductivity, and two alternating current supply electrodes 35 and 36 arranged at intervals on both sides of the electrical conductivity detecting electrode 34, respectively. Is done. The alternating current in phase is supplied to the two alternating current supply electrodes 35 and 36 at a constant voltage of the same potential via the amplifier 37. The electrical conductivity detecting electrode 34 is connected to the current amplifying amplifier 38 so that the current amplified through the current amplifying amplifier 38 is taken out as a value corresponding to the electrical conductivity of the fluid under test 33. .
    [33] The electrical conductivity measurement site | part in this electrical conductivity measuring apparatus 31 can be comprised as the electrical conductivity meter 1 as shown in FIG. In this electrical conductivity meter 1, an electrode for electrical conductivity measurement 4 having an electrode surface formed of a titanium oxide layer 3 on the surface of an electrode body 2 made of a conductive metal as shown in FIG. 3 is used. It is becoming. The titanium oxide layer 3 is formed on the surface of the electrode body 2 made of a conductive metal by surface treatment such as sputtering or plating, or is formed by oxidizing the surface of the electrode body 2 made of titanium metal. It is. Oxidation is carried out by electrolysis or air oxidation.
    [34] The electrode 4 for electrical conductivity measurement is used as an electrode corresponding to the three electrodes 34, 35, and 36 shown in FIG. 1, and as shown in FIG. 2, the electrode surface of the electrode holder 5 made of an insulator is shown. It is buried in an exposed state. The three electrodes 4 are arranged in a line, and the electrodes 4a on both sides, an electrode for supplying alternating current to which the electrodes 4b are connected to a power source, and the center electrode 4c serve as a sensor for detecting electrical conductivity The electrode for conductivity detection is comprised.
    [35] The electrode holder 5 is fixed at a predetermined position of the base 6. The base 6 is provided with an inlet 7 for introducing a fluid to be measured (for example, an aqueous solution) and an outlet 8 for outflow, a distribution hole 9 and a distribution hole 10 for measuring electrical conductivity. . The electrode holder 5 is provided with a distribution hole 11 and a distribution hole 12. The distribution hole 11 has a base distribution hole 9, and the distribution hole 12 has a base distribution hole 10. It is arrange | positioned so that each may communicate. The fluid to be measured introduced from the inlet 7 is connected to the electrode surface side of each electrode 4 through the inner passage 13 of the base 6, the distribution hole 9, and the distribution hole 11 of the electrode holder 5. Flows into the material storage space 14 to be formed. The substance storage space 14 to be formed forms a flow path for measuring the electrical conductivity of the fluid to be measured. Fluid from the substance storage space 14 to be measured flows out of the outlet port 8 through the distribution hole 12 of the electrode holder 5, the distribution hole 10 of the base 6, and the inner passage 15.
    [36] The base 6 is provided with through holes 16a, 16b, and 16c at positions corresponding to the electrodes 4a, 4b, and 4c, and the necessary electrical wiring is drawn out through the through holes 16a, 16b, and 16c. It is supposed to be.
    [37] In the present embodiment, the substance storage space 14 to be measured is partitioned by a sheet-shaped packing 17 and a transparent glass plate serving as a light-transmitting body that is disposed to be spaced apart from the electrode holder 5 via the packing 17. Also on the surface of the measurement target storage space 14 side of this glass plate 18, it is preferable that titanium oxide coating is given to such an extent that a light transmittance is not impaired. The electrical conductivity of the fluid flowing in this measurement substance storage space 14 is measured.
    [38] The electrode holder 5, the packing 17, and the glass plate 18 are fixed to one surface side of the base 6 by the cover member 20 via bolts 19. The cover member 20 is provided with the light-transmission window 21 open. Through this window 21, light from the light irradiation means 22 arranged outside is irradiated. The irradiated light is irradiated from the window 21 to the titanium oxide layer 3 forming the electrode surface of each electrode 4a, 4b, 4c through the glass plate 18. As the light to be irradiated, light having a wavelength exhibiting photocatalytic activity on the titanium oxide layer 3 is selected. For example, ultraviolet rays of a specific wavelength (for example, a wavelength of 300 to 400 nm) can be used, and as the light irradiation means 22, for example, black light that emits ultraviolet rays can be used.
    [39] In the electrical conductivity measuring apparatus 31 according to the first embodiment of the present invention disclosed in the basic form shown in FIG. 1, the electrical conductivity detecting electrodes 34 are disposed on both sides thereof, and an alternating current in phase is supplied. The two alternating current supply electrodes 35 and 36 are electrically shielded with respect to the ground point existing at any one of the extension installation sites of the measurement tube 32. That is, the constant voltage alternating current is supplied in phase to the two alternating current supply electrodes 35 and 36, and the potential difference between the electrical conductivity detecting electrode 34 and the alternating current supply electrodes 35 and 36 is always predetermined. Since it is maintained at a constant value, there is substantially no electrical resistance between the electrical conductivity detecting electrode 34 and the external ground point. Therefore, in the conventional apparatus shown in Fig. 8, the influence of the resistance between the electrode for electrical conductivity detection and the external ground point or the change in the resistance value from the electrical conductivity detection electrode from the output current is substantially completely eliminated. In other words, there is no leakage current from the electrical conductivity detecting electrode 34 to the external ground point. As a result, the output current from the electric conductivity detecting electrode 34 is always taken out in the absence of disturbance, and irregularities and fluctuations caused by the disturbance are prevented, so that the measurement of the electrical conductivity with high accuracy is always performed stably.
    [40] In addition, when the electrical conductivity measuring portion of the electrical conductivity measuring device 31 is configured as the electrical conductivity meter 1 as shown in Fig. 2, the respective electrodes 4a, The titanium oxide layer 3 provided on the surfaces of 4b and 4c exhibits photocatalytic activity. Therefore, even when the organic substance is contained in the fluid to be measured flowing through the storage space 14 to be measured, the organic substance is decomposed by the photocatalytic activity, so even if ion exchange is performed on the electrode surface at the time of the electrical conductivity measurement, Electrode organic matter is prevented from adhering to or adsorbing on the electrode surface. As a result, periodic cleaning of the electrode surface becomes unnecessary, and it is always stable even without cleaning, and electrical conductivity can be measured with high precision. In addition, the reproducibility of the measurement with high accuracy is ensured.
    [41] In addition, when titanium oxide coating is applied to the surface of the substance to be measured storage space 14 of the glass plate 18, adhesion or adsorption of organic matter is also prevented from this surface side, and the organic matter is accumulated in the substance to be measured storage space 14. Etc. is also prevented and good measurement accuracy is maintained.
    [42] 4 shows an electrical conductivity measuring device according to a second embodiment of the present invention. In the electrical conductivity measuring device 41, the fluid to be measured is measured with respect to the fluid to be measured 43 as a substance to be flowed into the insulated measuring tube 42 or stored in the measuring tube 42. Three electrodes 44, 45, 46 in contact with 43 are provided. The three electrodes are an electrical conductivity detecting electrode 44 for detecting electrical conductivity, an alternating current supply electrode 45 disposed at an interval on one side of the electrical conductivity detecting electrode, and an electrical conductivity detecting electrode ( And a ground electrode 46 spaced apart from the other side 44. A predetermined alternating current is supplied to the alternating current supply electrode 45 at a constant voltage via the amplifier 47. The electrical conductivity detecting electrode 44 is connected to the current amplifying amplifier 48 so that the current amplified through the current amplifying amplifier 48 is taken out as a value corresponding to the electrical conductivity of the fluid under measurement 43. . This electrical conductivity measuring apparatus 41 can also be comprised with the same electrical conductivity meter as shown in FIG.
    [43] In the electrical conductivity measuring device 41 according to the second embodiment, the alternating current is supplied at a constant voltage only to the alternating current supply electrode 45, and the ground electrode 46 is forced to the potential 0 by ground. These electrodes 45 and 46 are arranged on both sides of the electrode 44 for electric conductivity detection. Therefore, between the electrodes 45 and 46 is formed in what is called resistance division | segmentation in electrical circuit by the electrode 44 for electric conductivity detection. In the circuit between the electrodes 45 and 46, a predetermined constant voltage alternating current is supplied to the electrode 45, the potential of the electrode 46 is always zero by the ground, and this state is always stable. . That is, even if the extension installation site of any one of the measuring tubes 42 is in a grounded state, a constant term between the ground point and the electrical conductivity detecting electrode 44 cannot enter, thereby detecting electrical conductivity. The current drawn out from the electrode 44 does not move or fluctuate. Therefore, the output current from the electrical conductivity detecting electrode 44 is always taken out without disturbance, and irregularities and fluctuations caused by the disturbance are prevented, so that the measurement of the electrical conductivity with high accuracy is always performed stably.
    [44] In addition, when the electrical conductivity measuring site of the electrical conductivity measuring device 41 is configured as the electrical conductivity meter 1 as shown in Fig. 2, the same effects and effects as those in the first embodiment can be obtained. The more stable measurement which prevented adhesion and adsorption of organic substance etc. becomes possible.
    [45] In addition, the electrical conductivity measurement site | part of the electrical conductivity measuring apparatus which concerns on this invention can also be comprised as the electrical conductivity meter 51 as shown in FIG. 5, for example to make it smaller and thinner. In the electrical conductivity meter 51 shown in Fig. 5, three electrodes 52a, 52b, 52c are provided, for example, a power supply electrode to which both electrodes 52a, 52b are connected to a power source, and between them. The arranged electrode 52c constitutes a detection electrode which functions as a sensor for detecting electrical conductivity. Through-holes 53a, 53b, 53c are opened in the center of each electrode 52a, 52b, 52c, and a titanium oxide layer is provided on the inner surface of each of the holes 53a, 53b, 53c. On both sides of each of the electrodes 52a, 52b, 52c, spacers 54a, 54b, 54c, 54d made of a transmissive insulating material (for example, ethylene tetrafluoride) are disposed, and each electrode and each spacer are alternately disposed. It is stacked. The through holes 55a, 55b, 55c, 55d are also opened in the center portion of the spacers 54a, 54b, 54c, 54d. Support members 56a and 56b are disposed outside the two spacers 54a and 54d, and a stack of electrodes 52a, 52b and 52c and spacers 54a, 54b, 54c and 54d is sandwiched from both sides. Through-holes 57a and 57b are also opened in the centers of the supporting members 56a and 56b, and the openings and the fluids under which the ones of the tubes 58a into which the fluids to be measured are introduced are introduced into the holes 57a and 57b, respectively. One end of the tube 58b is inserted and fixed, respectively.
    [46] Through holes 55a, 53a, 55b, 53c, 55c, 53b, 55d connected by stacking the electrodes 52a, 52b, 52c and the spacers 54a, 54b, 54c, 54d, the flow path of the fluid under measurement Is formed. The fluid to be introduced through the tube 58a flows inside this flow path and then is discharged through the tube 58b. These tubes 58a and 58b are made of a light-transmissive material (for example, ethylene tetrafluoride), and ultraviolet light having a predetermined wavelength is irradiated from the black light 59 as light irradiation means. The irradiated ultraviolet light passes through the tubes 58a and 58b and repeats diffuse reflection in the tube. Thus, ultraviolet light is induced along the tubes 58a and 58b, and the electrodes (from the portions of the holes 57a and 57b on both sides). It is guided to the inner surface which consists of a titanium oxide layer in 52a, 52b, 52c). In addition, since each of the spacers 54a, 54b, 54c, and 54d is also made of a light-transmissive material, the ultraviolet light from the black light 59 passes through the spacers, and diffuses and reflects the electrodes 52a, 52b, 52c. Is investigated inside. In particular, by forming each electrode or each spacer relatively thin (for example, the thickness of each electrode is about 0.2 mm, the thickness of each spacer is about 1 mm), the flow path formed by each electrode and each spacer is relatively short. Therefore, even without using a special light guide such as an optical fiber, the light guide through the light transmitting tube 58a, 58b and the light guide through the light transmitting spacer 54a, 54b, 54c, 54d are sufficient for measurement. The amount of light is irradiated to a predetermined electrode surface. Therefore, in this embodiment, it can be comprised with a simpler and smaller apparatus.
    [47] The following tests were done about the electrical conductivity measuring apparatus shown in FIG. 1, FIG. 4, and these performances were confirmed.
    [48] <First Embodiment>
    [49] An electrical conductivity measuring apparatus (three electrodes not grounded) having three electrodes shown in FIG. 1 was configured, and the electrical conductivity was measured using a 240 kPa sodium chloride solution as the measurement solution. The control temperature of the measurement cell was 45 degreeC with respect to room temperature 25 degreeC at the time of a measurement. The water flow rate into the measurement cell was 1 ml / min. The results are shown in FIG.
    [50] Second Embodiment
    [51] An electrical conductivity measuring device (one electrode of one of which is grounded) having three electrodes shown in Fig. 4 was configured, and the electrical conductivity was measured using a 240 kPa sodium chloride solution as the measurement solution. The control temperature of the measurement cell was 45 degreeC with respect to room temperature 25 degreeC at the time of a measurement. The water flow rate into the measuring cell was 1 ml / min. The results are shown in FIG.
    [52] <First Comparative Example>
    [53] A conventional electrical conductivity measuring apparatus having two electrodes shown in FIG. 9 was constructed, and the electrical conductivity was measured using a 240 kPa sodium chloride solution as a measuring solution. The control temperature of the measurement cell was 45 degreeC with respect to room temperature 25 degreeC at the time of a measurement. The water flow rate into the measuring cell was 1 ml / min. The results are shown in FIG.
    [54] In the first embodiment, as shown in Fig. 6, there are few variations due to noise and the like, and stable results can be obtained with high accuracy. In the second embodiment, as shown in FIG. 7, as compared with the first embodiment, the movement of the potential component based on the offset as one electrode is grounded can be seen, but as in the result of the first embodiment, The fluctuations due to noise and the like were small, and stable results were obtained with high accuracy. In the first comparative example, as shown in Fig. 8, compared with the first or second embodiment, the noise caused by the disturbance was absorbed and the measured data fluctuated greatly, and a stable result could not be obtained systematically. . The disturbance in this first comparative example corresponds roughly to the operation of connecting and disconnecting the air conditioner and the switching operation of the solenoid valve solenoids provided in the vicinity thereof, and therefore, it is considered that the noise due to them is caused.
    [55] In the electrical conductivity measuring apparatus of the present invention, the electrical conductivity of an aqueous solution, a gaseous or slurry-type material to be measured, especially an aqueous solution, which is required to measure electrical conductivity, is stable and unchanged, and can be measured with high accuracy. Can be. By this electrical conductivity measurement, especially the ion concentration in aqueous solution can be measured with high precision.
    权利要求:
    Claims (18)
    [1" claim-type="Currently amended] It has three electrodes in contact with the substance to be measured, and the three electrodes consist of two electrodes for supplying alternating current which are spaced apart from each other on both sides of the electrode for detecting the electrical conductivity of the substance to be measured and the electrode for detecting the electrical conductivity. And the in-phase alternating current is supplied to the two alternating current supplying electrodes.
    [2" claim-type="Currently amended] The electrical conductivity measuring device according to claim 1, wherein a constant voltage of the same potential is applied to the two alternating current supplying electrodes.
    [3" claim-type="Currently amended] The electrical conductivity measuring device according to claim 1, wherein the three electrodes are formed on the surface of an electrode body made of a conductive metal by an titanium oxide layer.
    [4" claim-type="Currently amended] The electrical conductivity measuring device according to claim 4, further comprising: an object storage space formed between the electrode surfaces of the three electrodes and light irradiation means for irradiating light to each electrode surface.
    [5" claim-type="Currently amended] The electric conductivity measuring apparatus according to claim 4, wherein the light irradiated by the light irradiation means has a wavelength that causes the photocatalytic activity of the titanium oxide layer.
    [6" claim-type="Currently amended] The electric conductivity measuring apparatus according to claim 4, wherein the light irradiation means comprises a light source.
    [7" claim-type="Currently amended] The electric conductivity measuring apparatus according to claim 4, wherein the light irradiation means is made of a light guide member for guiding light from a light source.
    [8" claim-type="Currently amended] The electrical conductivity measuring device according to claim 4, wherein the storage space of the substance to be measured is partitioned by the light transmitting body, and light from the light irradiation means is irradiated to the electrode surface through the light transmitting body.
    [9" claim-type="Currently amended] The electrical conductivity measuring apparatus according to claim 8, wherein a transmissive titanium oxide coating is applied to the surface of the substance to be measured stored in the light-transmitting body.
    [10" claim-type="Currently amended] An electrode for ac current supply having three electrodes in contact with the substance to be measured, wherein the three electrodes are disposed at intervals on one side of the electrode for detecting the electrical conductivity of the substance to be measured, the electrode for detecting the electrical conductivity, and the electrical An electrical conductivity measuring device comprising a grounded electrode disposed at intervals opposite to the conductivity detecting electrode.
    [11" claim-type="Currently amended] The electrical conductivity measuring device according to claim 10, wherein a constant voltage is applied to the AC current supply electrode.
    [12" claim-type="Currently amended] The electrical conductivity measuring device according to claim 10, wherein the three electrodes each have an electrode surface formed of a titanium oxide layer on a surface of an electrode body made of a conductive metal.
    [13" claim-type="Currently amended] The electrical conductivity measuring apparatus according to claim 10, further comprising: an object storage space formed between the electrode surfaces of the three electrodes, and light irradiation means for irradiating light to each electrode surface.
    [14" claim-type="Currently amended] The electric conductivity measuring apparatus according to claim 13, wherein the light irradiated by the light irradiation means has a wavelength causing photocatalytic activity of the titanium oxide layer.
    [15" claim-type="Currently amended] The electric conductivity measuring apparatus according to claim 13, wherein the light irradiation means comprises a light source.
    [16" claim-type="Currently amended] The electric conductivity measuring apparatus according to claim 13, wherein the light irradiation means is made of a light guide member for guiding light from a light source.
    [17" claim-type="Currently amended] The electrical conductivity measuring device according to claim 13, wherein the storage space of the substance to be measured is partitioned by the light transmitting body, and light from the light irradiation means is irradiated to the electrode surface through the light transmitting body.
    [18" claim-type="Currently amended] The electrical conductivity measuring apparatus according to claim 17, wherein a transmissive titanium oxide coating is applied to the surface of the substance to be measured stored on the light-transmitting body.
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    同族专利:
    公开号 | 公开日
    JP2001235493A|2001-08-31|
    EP1172647A4|2003-07-09|
    AU3061201A|2001-09-03|
    TW502116B|2002-09-11|
    US20030155937A1|2003-08-21|
    EP1172647A1|2002-01-16|
    CN1193226C|2005-03-16|
    CN1366611A|2002-08-28|
    WO2001063269A1|2001-08-30|
    US6650127B2|2003-11-18|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2000-02-22|Priority to JP2000044495A
    2000-02-22|Priority to JPJP-P-2000-00044495
    2001-02-13|Application filed by 하시모토 쯔토무, 오르가노 가부시키가이샤
    2001-02-13|Priority to PCT/JP2001/000982
    2002-02-08|Publication of KR20020011386A
    优先权:
    申请号 | 申请日 | 专利标题
    JP2000044495A|JP2001235493A|2000-02-22|2000-02-22|Electric-conductivity measuring apparatus|
    JPJP-P-2000-00044495|2000-02-22|
    PCT/JP2001/000982|WO2001063269A1|2000-02-22|2001-02-13|Apparatus for measuring conductivity|
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