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1. 发明专利

JP2001208727A METHOD FOR EXAMINING SENSITIVITY OF CONSTANT POTENTIAL ELECTROLYTIC TYPE GAS SENSOR AND GAS MEASURING APPARATUS USING CONSTANT POTENTIAL ELECTROLYTIC TYPE GAS SENSOR 失效
公开(公告)号：JP2001208727A
公开(公告)日：2001-08-03
申请号：JP2000019455
申请日：2000-01-28
申请人： RIKEN KEIKI KK
发明人： ISHICHI TORU , UCHIKOSHI SHOICHI , ISHIBASHI MASARU , TSUKAHARA TAKANORI
IPC分类号： G01N27/416
摘要： PROBLEM TO BE SOLVED: To examine the sensitivity of a constant potential electrolytic type gas sensor without using actual gas. SOLUTION: The pulse with a potential V1 of 4-300 mV, a pulse width T of 0.01-0.5s and a product V1×T of 0.002 (Vs) or less of a pulse generation means is applied to the constant potential electrolytic type gas sensor 1. At least, an acting electrode 6 and a counter electrode 7 are provided in a cell 3 housing an electrolyte 2, the prescribed voltage of a constant potential power supply 10 is applied across the acting electrode 6 and the counter electrode 7 to output an electrolytic current proportional to the concentration of gas, and the sensitivity of the gas sensor 1 is inspected on the basis of the electrolytic current due to the pulse.

2. 发明专利

JP2006349526A ELECTROCHEMICAL DIBORANE SENSOR 审中-公开
公开(公告)号：JP2006349526A
公开(公告)日：2006-12-28
申请号：JP2005176665
申请日：2005-06-16
申请人： FURUYA CHOICHI , RIKEN KEIKI KK
发明人： MIZUTANI YOSHITAKA , MATSUDA HIROYUKI , ISHICHI TORU , FURUYA CHOICHI
IPC分类号： G01N27/404
摘要： PROBLEM TO BE SOLVED: To detect diborane at high accuracy while reducing interference errors as low as possible. SOLUTION: In the electrochemical gas sensor which takes in gas to be detected into an electrolysis solution through a breathable membrane and outputs an electric signal corresponding to concentration of the gas to be detected, the electrolysis solution 6 is sulfuric acid of 1-11.5 mol/dl, the breathable membrane 4 forming an action pole member 4' is formed by a mixed body of carbon black fine powder and fluororesin fine powder, and an electrode catalyst layer 13 is formed on the electrolysis solution 6 side of the breathable membrane 4. COPYRIGHT: (C)2007,JPO&INPIT

3. 发明专利

JP2000148002A OXYGEN SENSOR KIT FOR EDUCATION 失效
公开(公告)号：JP2000148002A
公开(公告)日：2000-05-26
申请号：JP32298398
申请日：1998-11-13
申请人： RIKEN KEIKI KK
发明人： ISHICHI TORU
IPC分类号： G09B23/06
摘要： PROBLEM TO BE SOLVED: To provide an oxygen sensor kit which is reliable in action, is easy in assembly and is recyclable. SOLUTION: This oxygen sensor kit is constituted to include a unit 1 by a supporting body 10 which is formed with a spherical surface part 11 at its front end, a metallic plate material 12 which is housed in the central region of this spherical surface part 11 so as to expose its surface and constitutes a working electrode connectable outside by a lead wire 14 and a metallic plate material 24 which is fixed to the flank part of the supporting body 10 and constitutes a counter electrode connectable to the outside by this lead wire 23. As a result, the metallic plate material 12 constituting the working electrode is fixed to the spherical surface part 11 at the front end and the metallic plate material 24 constituting the counter electrode to the flank thereof and, therefore, an oxygen permeable membrane is spread so as to be formed as thin as possible in the layer thickness of the electrolyte near the working electrode. In addition, the easy hermetic fixation by elastic fasteners is made possible.

4. 发明专利

JPH0755764A CONSTANT POTENTIAL ELECTROLYSIS TYPE ACIDIC GAS SENSOR 失效
公开(公告)号：JPH0755764A
公开(公告)日：1995-03-03
申请号：JP22062493
申请日：1993-08-12
申请人： RIKEN KEIKI KK
发明人： ISHICHI TORU , UCHIKOSHI SHOICHI , ISHIZUKA MASAAKI
IPC分类号： G01N27/416
摘要： PURPOSE:To regulate pH and to reduce a dark current by providing a work electrode having a noble metal layer in a through hole of a sidewall of a vessel, and filling an opposite electrode, alkaline electrolyte containing iodide ion, etc., in a cell covered outside with gas-permeable and water-repellent diaphragm. CONSTITUTION:A work electrode 3 formed with a gold layer on a stainless steel board is provided in a through hole 2 provided at one surface of a cell vessel 1, a PTEF film 4 having gas permeability, water repellency is extended on an outer surface, and a retainer cover 7 having an inlet 7b is fixed to its outside through a packing 5. A noble metal opposite electrode 8 and a reference electrode 9 are provided at predetermined intervals from the electrode 3 in the vessel 1, and a measuring circuit is connected to the electrodes. Electrolyte is regulated to pH of 7-9 by adding pH regulator to aqueous solution of KI, KIO3, KOH. When the pH is 7 or less, a dark current is abruptly increased, while when the pH is 8 or more, an output current is rapidly decreased. Accordingly, when the pH is regulated to 7-9, influence of unevenness of hydrogen ion concentration can be reduced while suppressing the dark current.

5. 发明专利

JPH04290957A INSULATING OIL DETERIORATION SENSING DEVICE 失效
公开(公告)号：JPH04290957A
公开(公告)日：1992-10-15
申请号：JP8084691
申请日：1991-03-19
申请人： RIKEN KEIKI KK
发明人： ISHICHI TORU , UCHIKOSHI SHOICHI
IPC分类号： G01N27/416
摘要： PURPOSE:To selectively sense the acetilene contained in an insulating oil. CONSTITUTION:At a window 3 installed in the wall surface of a vessel 2 a working electrode 4 is furnished, in which a metal 4b is formed on a diaphragm 4a consisting of a porous insulative film, while a reference electrode 7 is arranged at a window 5 installed in the other side wall surface, and therein dilute sulfuric acid is accommodated as an electrolyte 8. By a constant voltage circuit 10 a potential is impressed between these working electrode 4 and reference electrode 7, which is higher than the oxidating potential than acetylene and lower than the oxidating potential of ethylene. The acetylene having passed through the diaphragm 4a is oxidated and generates an oxidative current between the electrodes which is proportioned to the concentration. No electrolytic current will be generated even though ethylene passes the diaphragm 4a. Hydrogen, ethane, methane, CO, and CO2 are also contained in insulating oil, but a gas sensor 1 of constant voltage electrolysis type exhibits a very low sensitivity to these components, and therefore the acetylene in the insulating oil can be sensed with high sensitivity as long as the ethylene sensitivity is set low relative to the acetylene.

6. 发明专利

JPH1123512A MEASURING DEVICE 失效
公开(公告)号：JPH1123512A
公开(公告)日：1999-01-29
申请号：JP19191997
申请日：1997-07-02
申请人： RIKEN KEIKI KK
发明人： ISHICHI TORU , KOBAYASHI HISAYOSHI
IPC分类号： G01D3/02 , G01N27/00 , G01N27/12 , G01N27/26
摘要： PROBLEM TO BE SOLVED: To make accurate calibration by installing a sensor with a memory means storing the date of production and the change data of sensitivity after lapse of time, calculating the period after production with a control means, and making a calibrating action based on the change data after lapse of time. SOLUTION: This measuring device is provided with a calibrating circuit 22 making span adjustment and zero-point adjustment and a display driving means 23. A control means 26 reads the data of the nonvolatile writable memory of a sensor and a calibration data memory means 25 via an interface 24 based on the command of a control panel 2 and control the inspection of the compatibility of the sensor and a calibrating action. When the shipped sensor is delivered to an end user and the gas sensor is replaced, whether it is a compatible sensor or not is judged. When the compatible sensor is installed, the elapsed period after production is calculated based on the date of production in the nonvolatile writable memory and the built-in clock of the gas measuring device, the initial value of a sensor cell is calculated based on the elapsed period and the change data after the lapse of time, and the initial value is used as calibration data for calibration.

7. 发明专利

JPS6441853A MEASUREMENT OF DENSITY OF CHLORINE ION FOR READY-MIXED CONCRETE 失效
公开(公告)号：JPS6441853A
公开(公告)日：1989-02-14
申请号：JP19778887
申请日：1987-08-07
申请人： RIKEN KEIKI KK
发明人： ISHICHI TORU
IPC分类号： G01N27/416 , G01N33/38
摘要： PURPOSE:To measure the density of chlorine ion accurately irrelevant to the presence of melamine sulfonate, by adding boric acid to a ready-mixed concrete to perform a measurement with the density of hydrogen ion below 7.0. CONSTITUTION:A chlorine ion measuring electrode body 1 is made of a sensitive film 3 comprising a mixture of silver chloride and silver sulfide fixed at one end of a cylindrical support 2 and a silver line 4 connected to the back of the film 3. A comparison electrode body 5 is made up of a potassium chloride liquid 8 housed in a container 7 forming a liquid junction 6 at the tip thereof and an internal pole 9 comprising silver chloride immersed thereinto. When the electrode bodies 1 and 5 thus obtained are immersed into a top liquid of the ready-mixed concrete to measure the density of chlorine ion, boric acid is added beforehand to shift the density of hydrogen ion below 7.0. This enables accurate measurement of the density of chlorine ion with dissociation made impossible even in the presence of melamine sulfonate.

8. 发明专利

JP2002340753A GAS-SAMPLING PROBE 失效
公开(公告)号：JP2002340753A
公开(公告)日：2002-11-27
申请号：JP2001149293
申请日：2001-05-18
申请人： RIKEN KEIKI KK
发明人： UCHIKOSHI SHOICHI , ISHICHI TORU , NAKAMURA YUKIO , KOBAYASHI OSAO
IPC分类号： G01N1/22
摘要： PROBLEM TO BE SOLVED: To provide a gas-sampling probe for guiding a target gas surely from the inside of fluid flowing at a high speed to a gas detection means. SOLUTION: A shell 1 made of a gas non-adsorbing material where one end is connected to a gas suction means and the other is sealed is provided with a plurality of through holes 2 that are thinner than the inner diameter of the shell 1 at a prescribed interval in the longitudinal direction. The shell is made of a tube that has an inner diameter of 4 mm and is made of polyethylene fluoride, and the diameter of the through holes ranges from 0.5 to 1.5 mm.

9. 发明专利

JPH09243594A CONSTANT-POTENTIAL ELECTROLYSIS TYPE AMMONIA GAS DETECTOR 失效
公开(公告)号：JPH09243594A
公开(公告)日：1997-09-19
申请号：JP7319196
申请日：1996-03-04
申请人： RIKEN KEIKI KK
发明人： ISHICHI TORU , IIJIMA TETSUYA
IPC分类号： G01N27/416 , G01N27/404
摘要： PROBLEM TO BE SOLVED: To detect low-concentration ammonia gas by suppressing sensitivity for carbon dioxide gas, hydrogen and organic solvent as much as possible. SOLUTION: A window 3 sealed by a diaphragm 4, wherein an acting electrode 4b is formed of a porous film 4a on the side of electrolyte 2, is provided in a cell 1. In this cell 1, the neutral electrolyte 2 containing ethylene glycol and a counter electrode 7 are accommodated. At the same time, the potential of the acting electrode 4b is maintained at 0-450mV for a silver/silver chloride electrode in potassium-chloride electrolyte of 0.1mol. The ammonia, which is dissolved into the electrolyte 2 from the diaphragm 4, undergoes dissociation reaction and oxidation reaction at the acting electrode 4b and forms the electrons in proportion to the concentration. In the meantime, hydrogen and the organic solvent cannot generate electrolytic current because the oxidation power of the acting electrode 4b is weak. Furthermore, the oxidation and reduction reaction of carbon dioxide gas are suppressed by the ethylene glycol.

10. 发明专利

JPH0587774A ACIDIC GAS MEASURING DEVICE 失效
公开(公告)号：JPH0587774A
公开(公告)日：1993-04-06
申请号：JP27342791
申请日：1991-09-25
申请人： RIKEN KEIKI KK
发明人： ISHICHI TORU
IPC分类号： G01N27/416 , G01N27/404
摘要： PURPOSE:To electrochemically measure the concn. of gas low in acidity with high sensitivity. CONSTITUTION:A window 2 is provided to a container 1 storing an electrolyte 6 whose hydrogen ion concn. is about 10 -10 mol/l to be sealed by a gas permeable membrane 7 and a metal layer 9 is arranged in the vicinity of the window 2 to form an acting electrode and a metal electrode becoming an opposed electrode is immersed in the electrolyte 6. Potential oxidizing the metal layer 9 is applied to the metal layer 9 to form metal oxide and potential reducing said metal oxide is applied to generate reducing reaction of PtO+2 H +2e Pt+H2O and the reducing current at this time is set to a measured value. Since this reducing reaction is performed in the presence of a hydrogen ion, the potential applied to the acting electrode becomes a value smaller than the absolute value of the potential generating the electrolysis of water and, therefore, the concn. of gas to be inspected can be rapidly measured with high sensitivity without receiving the effect due to the electrolysis of water.

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