公开(公告)号：JPH06249832A

公开(公告)日：1994-09-09

申请号：JP6287693

申请日：1993-02-26

Applicant: TOA ELECTRONICS

Inventor： NAKANO TAISUKE

IPC: G01N27/49

Abstract: PURPOSE:To provide a method for invarrably the correct concentration of chlorous acid ions continuously in a simple manner, without being given with the influence of the dissolved dioxidized chlorine, even if the electric coductivity of a sample liquid varies, by using the polarography method. CONSTITUTION:Two electrodes consisting of a working electrode 4 and a counter electrode 5 or three electrodes consisting of the working electrode 4, reference electrode 6 and the counter electrode 5 are immersed in a sample liquid. Relatively moving the working electrode 4 and the sample liquid, the voltage for generating the oxidation electric current of chlorous acid ion is applied on the working electrode 4, having the counter electrode 5 as standard in case of two electrodes, while having the reference electrode 6 as standard in case of three electrodes, and the concentration of the chlorous acid ions in the sample liquid is measured on the basis of the flowing oxidation electric current. then, the chlorous acid ion is measured carrying out compensation according to the electric coductivity of the sample liquid for which the concentration of chlorous acid ion is measured separately.

公开(公告)号：JPH06160331A

公开(公告)日：1994-06-07

申请号：JP33357992

申请日：1992-11-19

Applicant: TOA ELECTRONICS

Inventor： YANAGIDA YOSHINORI ,  SAKURAI HISASHI ,  TAKAYAMA MASAHARU

IPC: G01N27/28 ,  G01N27/36

Abstract: PURPOSE:To furnish a flow-through type pH electrode which can be used very effectively in a measuring system of which a pH measuring range is 0 to 14, as well. CONSTITUTION:A pipe 20 for introducing a liquid to be inspected is disposed inside a tubular member 4 having a spherical pH-sensitive glass film 8 formed in the upper end. The liquid to be inspected is introduced by the pipe 20 and made to strike against the spherical pH-sensitive glass film 8. This liquid passes through a circular passage 24 formed between the tubular member 4 and the pipe 20 and is discharged from a discharge port 18.

公开(公告)号：JPH05332983A

公开(公告)日：1993-12-17

申请号：JP16433792

申请日：1992-05-29

Applicant: TOA ELECTRONICS

Inventor： YAMASATO MASAHARU ,  YANAGIDA YOSHINORI ,  KATO AKIHIKO ,  KONNO HIROKO

IPC: G01N27/30 ,  G01N27/403

Abstract: PURPOSE:To make it possible to measure ion activity on the surface of an object to be measured and the inside thereof by means of one composite electrode for measuring ion active amount. CONSTITUTION:A needle-like ion activity sensing electrode 1 that is provided with an ion active sensing membrane on its tip surface is fixed on a metallic tubular body 5 with an insulation tubular body 4 interposed. The body 5 is arranged inside an inner tubular body 11 of an insulation cover 10 with double- ply construction where the inner tubular body 11 and outer tubular body 12 are provided and a groove 14 is formed in an axial direction as to penetrate the side face, in such a way that the body 5 will be able to slide in an axial direction, being closely contact with the inner surface of the body 11. On the other hand, a liquid junction pad 16 of comparing electrode is fitted in a doughnut-like front end opening between the body 11 of the cover 10 and the body 12, and an inner electrolyte 17 and an inner electrode 18 of the comparing electrode are arranged in an inner space. Further, the sliding position is set in such a way that the surface of the junction 16 will be on the same plane of the surface of the electrode 1 when the electrode is drawn back to the utmost.

公开(公告)号：JPH05203616A

公开(公告)日：1993-08-10

申请号：JP3867592

申请日：1992-01-29

Applicant: TOA ELECTRONICS

Inventor： KATO AKIHIKO ,  YAMASATO MASAHARU ,  YANAGIDA YOSHINORI ,  KONNO HIROKO

IPC: G01N27/26 ,  G01N27/30 ,  G01N27/416

Abstract: PURPOSE:To stabilize an electrode potential of a pH electrode using metal or metal oxide for pH-sensitive film easily in a short time, and facilitate calibra tion operation. CONSTITUTION:After completion of measurement, pH electrode 30 and a comparison electrode 10 are contained in an adaptor 1 attached to a device main body, and electrodes 30, 10 are immersed in solution 15 of pH6.86, which is similar to that of inner liquid 13 of the comparison electrode 10, injected inside it. Electrode plugs of the electrodes 30, 10 are connected to a pH terminal 2 and a comparison terminal 3, and a switch 4 is put on, so the pH electrode 30 and the comparison electrode 10 are shortcircuitted. An electrode potential of the pH electrode 30 is thus returned to its original condition soon to be stabilized. In the meanwhile, the pH terminal of the device main body is shortcircuitted with the comparison terminal, and a gauge pointing value is set at pH6.86. Calibration for one point can thus be performed electrically, thereby need of complicated calibration operation can be eliminated.

公开(公告)号：JPH02296145A

公开(公告)日：1990-12-06

申请号：JP11628989

申请日：1989-05-10

Applicant: TOA ELECTRONICS

Inventor： FURUYA ETSUO

IPC: G01N27/49 ,  G01N27/416

Abstract: PURPOSE:To make it possible to perform measurement for a long period without special electrolyte and reagent which must be replenished and replaced by using a sample liquid itself containing chlorite ions as electrolyte, and measuring electrolysis current. CONSTITUTION:Two electrodes of working electrode 3 and a counter electrode 4 or three electrodes of the electrodes and an additional reference electrode 5 are immersed into a sample liquid 2. The electrode 3 comprising noble metal or carbon is relatively moved with respect to the sample liquid 2. Chlorite ions in the sample liquid 2 undergo electrolysis, and oxidizing current is generat ed. The voltage of the oxidizing current is applied to the electrode and the generated current is measured with an ammeter 6 with the couter electrode 4 as a reference in the case of two electrode and with a potentiostat 7 with the electrode 5 as a reference in the case of the three electrodes. Since the oxidizing current is proportional to the concentration of the dissolved chlorite ions, the concentration of the chlorite ions in the sample liquid 2 can be obtained by obtaining the relationship between the concentration of the chlorite ions and the value of the oxidizing current beforehand.

公开(公告)号：JPH02280051A

公开(公告)日：1990-11-16

申请号：JP10084189

申请日：1989-04-20

Applicant: TOA ELECTRONICS

Inventor： HATA HIROSHI ,  SAITO HIROKO ,  GOTO RYOZO ,  YAMASATO MASAHARU

IPC: G01N30/02 ,  G01N30/26

Abstract: PURPOSE:To simultaneously measure the monovalent and bivalent anion concns. with high sensitivity by conductometry by using a single liq. eluent contg. a metal ion and an org. acid forming a complex with the metal ion as the eluent to separate the respective cations. CONSTITUTION:A single separation column is used, and respective cations are separated using a liq. eluent contg. a metal ion and an org. acid forming a complex with the metal ion. Consequently, all the cations can be separated by the ordinary ion chromatography with a single separation column and a single liq. eluent, and the monovalent and bivalent cation concns. are simultaneously measured with high sensitivity. In addition, the metal ion should be trivalent aluminum ion, and citric acid or tartaric acid is preferably used as the org. acid.

公开(公告)号：JPS6466558A

公开(公告)日：1989-03-13

申请号：JP22356887

申请日：1987-09-07

Applicant: TOA ELECTRONICS

Inventor： ISHII MASARU ,  KIYONO YUKO ,  GOTSU TOSHIO ,  AIKAWA KATSUAKI

IPC: G01N27/416 ,  G01N27/27 ,  G01N27/30

Abstract: PURPOSE:To obtain a high-level measuring accuracy, by having a fixed amount of ion species predetermined present in a reaction liquid to use an ion selecting electrode as reference electrode selectively responding to the ion species. CONSTITUTION:An immuno enzyme composite such as solid phase oriented antibody-antigen-enzyme labelled antibody is formed by immunological reaction and then, an enzyme reaction is caused between enzyme and a substrate of an immuno enzyme composite and the subsequent enzyme activity is measured with an oxidizing/reducing potential measuring apparatus. Here, somewhere between the outset of the immunological reaction and the measurement of an oxidizing/reducing potential, a fixed amount of specified ion species is made present in a reaction liquid. The reaction liquid 1 is sampled into a container 9 to be passed to a flow cell 2 having an indication electrode 3 and a reference electrode 4 selectively sensitive to the ion species with a peristatis pump 8 or the like to detect the oxidizing/reducing potential being discharged to a waste liquor tank 10. Then, a potential difference detected with both the electrodes 3 and 4 is shown as voltage value on a display section 7 through an amplifier 5 and a signal processing section 6 thereby obtaining a high-level measuring accuracy.

公开(公告)号：JPS62261950A

公开(公告)日：1987-11-14

申请号：JP10469986

申请日：1986-05-09

Applicant: TOA ELECTRONICS

Inventor： SUZUKI KIYOSHI

IPC: G01N27/26 ,  G01N27/416

Abstract: PURPOSE:To easily detect the crack generated at the detecting end of an electrode by passing specified AC current in superposition to a circuit for generating the electromotive force of the electrode and detecting the current change thereof. CONSTITUTION:The AC current is passed from an AC power source 5 via a capacitor C for blocking DC current to a detecting circuit loop connecting the detecting end for measurement consisting of the indicator electrode 1 such as glass electrode, liquid 3 to be examined and a reference electrode 2 and an input terminal of a measuring apparatus. Abnormality is detected from the change (e) of the AC voltage generated at both terminals of a resistor R1 inserted into said circuit. The presence or absence of the generation of the abnormality is detected continuously without removing the electrode and without affecting the measurement according to the above-mentioned method. The device can deal quickly with the abnormality by a pilot lamp 10 or the like if such abnormality arises.

公开(公告)号：JPS6239774A

公开(公告)日：1987-02-20

申请号：JP18030985

申请日：1985-08-16

Applicant: TOA ELECTRONICS

Inventor： SHIMADA KOICHI

IPC: G01R27/08

Abstract: PURPOSE:To make it possible to measure a high resistance body connected to first and second switches, by connecting a plurality of series circuits of first and second switches comprising a semiconductor in parallel and further connecting said circuits to both terminals of a constant voltage source through a current detecting resistor. CONSTITUTION:At the time of the measurement of high resistance, a high voltage resistant diode 39 is connected to a current supply transistor Tr 26 in series so as to withstand the high voltage of a constant voltage source 13. A current detecting Tr 28 is also formed of a high voltage resistant element and, in order to bring the leak current to a Tr driving circuit to zero, photoresistors are used as Tr 26, 28 and connected to the driving circuit by a photocoupler. At the time of measurement, switch 34, 35, 33 are turned ON and a switch 31 is turned OFF. In this state, the supply voltage of the constant voltage source 13 is monitored from the output of an amplifier 37 and, for example, the minute current flowing to the high resistance body to be measured connected to measuring terminals 31, 32 is detected on the basis of the output of an amplifier 16 or 38 and the resistance value of the high resistance body is measured.

公开(公告)号：JPS5888650A

公开(公告)日：1983-05-26

申请号：JP18857181

申请日：1981-11-24

Applicant: TOA ELECTRONICS ,  ICHIJIYOU BUNJIROU

Inventor： ICHIJIYOU BUNJIROU

IPC: G01N33/483 ,  G01N27/72 ,  G01N27/90 ,  G01R27/02

Abstract: PURPOSE:To detect the nature of a sample, by coupling a coil for detection with the sample electromagnetically and thus generating a high frequency eddy current, and measuring the loss of the eddy current. CONSTITUTION:An output tank circuit 18 is connected to a high frequency oscillator 15 of frequency (f), and the output of this tank circuit 18 is coupled electrostatically with the 1st tuning circuit 22 and the 2nd tuning circuit 23 through fine-capacity capacitors 19 and 21. A coil 11 for detection is connected to the connection point between capacitors 26 and 27 of the 1st tuning circuit 22, and a 90 deg. out-of-phase converting circuit 39 is coupled electrostatically with the 2nd tuning circuit 23 through a capacitor 36. When a sample 12 is coupled with the coil 11, the output of ammeter 51 is ceased by adjusting a differential capacitor 61 in the tuning circuit 23 to find the loss of an eddy current. Then, from the frequency (f), the inductance L2 of the coil 11, and the coupling coefficient K between the coil 11 and sample 12, QX=LX/RX and fine variation in eddy current loss are found by prescribed relation equation.