公开(公告)号：DE69123896D1

公开(公告)日：1997-02-13

申请号：DE69123896

申请日：1991-08-20

Applicant: TOA ELECTRONICS

Inventor： KATO AKIHIKO ,  YAMASATO MASAHARU ,  TAGUCHI TOMIO ,  YANAGIDA YOSHIKI ,  KATUBE TERUAKI

IPC: G01N27/333

Abstract: A pH measuring electrode having a sensor film (3) which is sensitive to hydrogen ion (H ) in solution and method of manufacturing it are described. The electrode has a sensor film (3) of metal oxide deposited on an electrically conductive support (1) so that the sensor film can be miniaturized. Also, in a further embodiment, the electrode includes a porous film (23) of insulation material coated on the surface of the metal oxide sensor film so that the sensor film is not affected by any interferring substances.

公开(公告)号：DE69123896T2

公开(公告)日：1997-06-26

申请号：DE69123896

申请日：1991-08-20

Applicant: TOA ELECTRONICS

Inventor： KATO AKIHIKO ,  YAMASATO MASAHARU ,  TAGUCHI TOMIO ,  YANAGIDA YOSHIKI ,  KATUBE TERUAKI

IPC: G01N27/333

Abstract: A pH measuring electrode having a sensor film (3) which is sensitive to hydrogen ion (H ) in solution and method of manufacturing it are described. The electrode has a sensor film (3) of metal oxide deposited on an electrically conductive support (1) so that the sensor film can be miniaturized. Also, in a further embodiment, the electrode includes a porous film (23) of insulation material coated on the surface of the metal oxide sensor film so that the sensor film is not affected by any interferring substances.

公开(公告)号：JPH08101159A

公开(公告)日：1996-04-16

申请号：JP25967394

申请日：1994-09-30

Applicant: TOA ELECTRONICS

Inventor： KATO AKIHIKO ,  YAMASATO MASAHARU ,  TAGUCHI TOMIO ,  KATSUBE TERUAKI

IPC: G01N27/30

Abstract: PURPOSE: To provide a pH measuring electrode which uses iridium oxide as a pH sensitive film, is constructed small and sturdily, easy to manufacture, presents easiness in working, excels in the resistance against chemicals, has a wide pH range measurable, and which can measure not only liquid but also the surface or inside of a solid matter and also can make measurement stably for a long period of time. CONSTITUTION: The pH measuring electrode 1 includes an insulative supporting member 42 in a thin and long shape and a pH sensitive part 2 fixed to one end of the supporting member 42 in contact with an object to be measured while exposing only its end plane part substantially to the outside. The part 2 has a rod 28 of insulative ceramic whose one end 28a is shaped in to a plane, and the surface of the rod 28 is subjected to a specular finish so that at least the surface roughness is Rmax 0.02 and Ra 0.002, and thereover, an iridium oxide film 22 is formed whose iridium-oxygen proportion ranges 1:2.5 to 1:3.5, and further a porous insulative film 23 is formed covering at least a part of the peripheral circumferential surface and the end plane where the iridium oxide film 22, is provided.

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：JPH06174690A

公开(公告)日：1994-06-24

申请号：JP35097892

申请日：1992-12-04

Applicant: TOA ELECTRONICS ,  TOTO LTD

Inventor： KATO AKIHIKO ,  YAMASATO MASAHARU ,  YANAGIDA YOSHINORI ,  MATSUNO TAKANORI ,  OTANI TAKAYUKI

IPC: G01N27/30 ,  G01N27/416

Abstract: PURPOSE:To provide a method of always stably measuring pH of an electrolytic acid solution by utilizing a metallic oxide pH electrode which is easily used in a hospital, farm, home or the like. CONSTITUTION:A metallic oxide pH electrode is immersed in a water containing residual chlorine until a voltage relative to an electrolytic acid solution with prescribed pH becomes stable. After that, a voltage obtained from the electrolytic acid solution with prescribed pH by means of the metallic oxide pH electrode is regarded as a prescribed pH, thereby the method of measuring pH of the electrolytic acid solution can be attained.

公开(公告)号：JPH0518927A

公开(公告)日：1993-01-26

申请号：JP23387491

申请日：1991-08-21

Applicant: TOA ELECTRONICS

Inventor： KATO AKIHIKO ,  YAMASATO MASAHARU ,  TAGUCHI TOMIO ,  KATSUBE TERUAKI

IPC: G01N27/30

Abstract: PURPOSE:To obtain an electrode which has an improved chemical resistance with a small amount and enables a stable measurement to be made by providing an insulation support and a iridium oxide sensitive film which is formed on the support and by specifying a ratio of oxygen for the sensitive iridium. CONSTITUTION:An iridium oxide sensitive film 2 is provided on a surface of an insulation support 1 and a lead wire 3 is taken out of one edge of the sensitive film 2. The lead wire 3 as well as the sensitive film 2 at one edge side and one portion of the support 1 are covered with a support pipe 4 consisting of plastic such as polyvinyl chloride and are fixed, thus forming an electrode for measuring pH. The sensitive film 2 is iridium oxide with a ratio of oxygen to iridium being 2.5-3.5. By using this iridium oxide sensitive film 2, an improved linear response within a range of pH 0-14 can be obtained and further the response is fast and is stable over a long period. Also. it is desirable that the sensitive film 2 is as thick as 400-100,000 Angstrom and the response speed becomes slow outside this range, thus causing drift to occur and stability to deteriorate.

公开(公告)号：JPH06109696A

公开(公告)日：1994-04-22

申请号：JP28530792

申请日：1992-09-30

Applicant: TOA ELECTRONICS ,  TOTO LTD

Inventor： KATO AKIHIKO ,  YAMASATO MASAHARU ,  YANAGIDA YOSHINORI ,  MATSUNO TAKANORI ,  OTANI TAKAYUKI

IPC: G01N27/26 ,  C02F1/46 ,  G01N27/40 ,  G01N27/416

Abstract: PURPOSE:To obtain a method and device for easily measuring the pH of electrolytic acid water at a manufacturing site or a usage site such as a hospital and a house. CONSTITUTION:Two pH sensitive electrodes 3 and 4 are laid out at a channel 2 inside a flow cell 1, the pH sensitive electrodes 3 and 4 are calibrated with tap water supplied to the channel 2 as a calibration liquid, and then electrolytic acid water is supplied to only the pH sensitive electrode 4 while the pH sensitive electrode 3 is allowed to contact the tap water. While the tap water and the electrolytic acid water are liquid-joined in the channel, the pH of the electrolytic acid water is measured according to the difference in the potential between two pH sensitive electrodes 3 and 4.

公开(公告)号：JPH0523360A

公开(公告)日：1993-02-02

申请号：JP23387691

申请日：1991-08-21

Applicant: TOA ELECTRONICS

Inventor： KATO AKIHIKO ,  ITO YOSHIHARU ,  YANAGIDA YOSHINORI ,  YAMASATO MASAHARU ,  KATSUBE TERUAKI

IPC: A61B5/00 ,  A61B5/0408 ,  A61B5/0478 ,  A61B5/0492 ,  A61B10/00 ,  A61C19/04 ,  G01N27/30

Abstract: PURPOSE:To obtain an electrode for pH measurement which is fast, gives good response with high speed over a wide pH range, makes a stable measurement for a long period possible and can be constituted into an extremely fine shape so as to be suitable for dental examination. CONSTITUTION:The title electrode is an electrode for pH measurement wherein a supporting body 3 wherein an insulating film 2 is provided on the surface of an electrically conductive base material 1, an iridium oxide responding film 4 provided by electrically connecting it with the inner electrically conductive base material 1 on the side face or the apex face of one side of the supporting body 3 and a porous protective film 5 covering the iridium oxide responding film 4 and formed on the supporting body 3 are provided and the iridium oxide responding film 4 consists of iridium oxide with a ratio of oxygen to iridium of 2.5-3.5.

公开(公告)号：JPH0518929A

公开(公告)日：1993-01-26

申请号：JP23387591

申请日：1991-08-21

Applicant: TOA ELECTRONICS

Inventor： KATO AKIHIKO ,  YANAGIDA YOSHINORI ,  YAMASATO MASAHARU ,  KATSUBE TERUAKI

IPC: A61B5/145 ,  A61B5/1468 ,  G01N27/30

Abstract: PURPOSE:To obtain an electrode for measuring pH and its measuring method which enables the entire electrode to be formed finely, is rigid and at the same time superb in chemical resistance, achieves an improved response over a wide pH range and a stable measurement for a long period of time. CONSTITUTION:An electrode for measuring pH is provided with a conductive support 1 and an iridium oxide sensitive film 3 which is formed on a surface of the conductive support 1 and preferably is provided with the conductive support 1, an insulation film 2 which is provided at one portion of the conductive support 1, and the iridium oxide sensitive film 3 which is formed while it is in contact with the conductive support 1 at a portion without any insulation film 2. The iridium oxide sensitive film 3 consists of an iridium oxide where a ratio of oxygen to iridium is 2.5-3.5.