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1. 发明专利

JP2000019153A CARBON MONOXIDE SENSOR AND CARBON MONOXIDE CONCENTRATION MEASURING METHOD 失效
公开(公告)号：JP2000019153A
公开(公告)日：2000-01-21
申请号：JP19068098
申请日：1998-07-06
申请人： TOKYO GAS CO LTD , YAZAKI CORP
发明人： NAKAMURA KENICHI , TANDA RYOJI , MOCHIZUKI KAZU , TAKASHIMA HIROMASA
IPC分类号： G01N27/409 , G01N27/416
摘要： PROBLEM TO BE SOLVED: To make carbon monoxide detectable easily and accurately in a wide concentration range from a low concentration area to a high concentration area by changing the temperature of a sensor element by a sensor element temperature changing means according to the concentration of measured object gas. SOLUTION: An output port 1301 of an MPU 13 controls a heater power source 12 to switch high-low of the temperature of a solid electrolyte type sensor element 11. With power source closed, the MPU 13 outputs a signal L0 from the output port 1301 to the heater power source 12 and substitutes the output of the sensor element 11 held at a low temperature (400 deg.C, for instance) for a variable (x) from an input port 13i. When this variable X-value is 2V or more, that is, a measured object has high concentration, the signal L0 is outputted again to the heater power source 12 to hold the sensor element 11 at a high temperature (500 deg.C, for instance). When the variable x-value substituted by the output of the sensor element 11 at the time of high temperature is 1.3 V or more, concentration is high, and the variable x-value is made X by amplification to obtain gas concentration (y) by a high concentration time analytical curve, while gas concentration (y) is obtained by a low concentration time analytical curve at the time of low concentration with the x-value less than 2 V and outputted from an output port 1302 to an LCD 14.

2. 发明专利

JP2002014076A SOLID ELECTROLYTE TYPE MICRO GAS SENSOR AND ITS MANUFACTURING METHOD 失效
公开(公告)号：JP2002014076A
公开(公告)日：2002-01-18
申请号：JP2000198222
申请日：2000-06-30
申请人： TOKYO GAS CO LTD , YAZAKI CORP
发明人： NAKAMURA KENICHI , IDE TAKAHIRO , TANDA RYOJI , MOCHIZUKI KAZU , TAKASHIMA HIROMASA
IPC分类号： G01N27/409 , G01N27/416
摘要： PROBLEM TO BE SOLVED: To provide a carbon monoxide gas sensor using a solid electrolyte that is formed by the thick-film method, while suppressing the power consumption by miniaturizing a heating part. SOLUTION: In this solid electrolyte type micro gas sensor, provided with a substrate 10, that is made of a semiconductor or a semi-insulating material, a structure material 20 provided on the surface of the substrate 10, a heater member 30 provided on the surface of the structure material 20, an interlayer insulating film 40 provided by covering the surface of the heater member 30 and the structure material 20, and a carbon monoxide gas detection element that is made of a flammable gas oxidation catalyst layer 50, a first electrode 60 that can diffuse gas and provided on the surface of the flammable gas oxidation catalyst layer 50, an oxygen ion-conductive solid electrolyte layer 70 provided while covering the first electrode 60, and a second electrode 80 that is exposed to a measurement gas provided on the surface of the solid electrolyte layer 70 is provided on the surface of an interlayer insulating film 40, so that the detection element is located at the upper portion of the heater member 30, is provided with a cavity part 15 which reaches the structure material 20 from the reverse side of the substrate 10 at the lower portion of the heater member 30.

3. 发明专利

JP2000019150A SOLID ELECTROLYTE TYPE CO SENSOR AND AGING METHOD THEREOF 失效
公开(公告)号：JP2000019150A
公开(公告)日：2000-01-21
申请号：JP18585498
申请日：1998-07-01
申请人： TOKYO GAS CO LTD , YAZAKI CORP
发明人： TANDA RYOJI , NAKAMURA KENICHI , MOCHIZUKI KAZU , TAKASHIMA HIROMASA
IPC分类号： G01N27/409 , G01N27/416
摘要： PROBLEM TO BE SOLVED: To heighten the reliability in detecting incomplete combustion by narrowing the distance between electrodes markedly so as to reduce the impedance of a sensor and thereby to make the H2/CO output ratio more satisfactory. SOLUTION: In this CO sensor, an alumina insulating film 5 is laminated on the surface of an alumina base 6 with a heater having output takeoff load wires 7 attached, for instance, and a thin film 4 of a combustible gas oxidized catalyst and an electrode 3 are laminated thereon in this order respectively by screen printing. A YSZ paste is further screen-printed on its upper face to form a solid electrolyte tin film 2, and finally an electrode 1 is laminated on its upper face. The distance between both electrode is controlled by adjusting the thickness of the solid electrolyte thin film 2 by selecting the grain size of YSZ fine powder, paste concentration and screen roughness. In this CO sensor, the distance between both electrodes is made less than 10 μm to obtain H2/CO output ratio

4. 发明专利

JP2002031338A MONITORING DEVICE FOR GAS COMBUSTION DEVICE 失效
公开(公告)号：JP2002031338A
公开(公告)日：2002-01-31
申请号：JP2000218945
申请日：2000-07-19
申请人： TOKYO GAS CO LTD , YAZAKI CORP
发明人： TANDA RYOJI , MOCHIZUKI KAZU , TAKASHIMA HIROMASA
IPC分类号： F23N5/24 , F23N5/00
摘要： PROBLEM TO BE SOLVED: To provide a monitoring device for a gas combustion device to effectively detect abnormality of CO concentration, while battery life time is markedly increased. SOLUTION: The monitoring device for a gas combustion device comprises a detecting timing control means 11A and an abnormality cut-off control means 11B. A detection timing control means 11A causes drive of a solid electrolytic type CO sensor 10 immediately after or by a given stabilizing time following the on-timing of a gas combustion device, in response to the on-timing of the gas combustion device and control is effected, such that CO concentration is detected. Furthermore, the detection timing control means 11A effects control, such that CO concentration is detected by drive of the solid electrolytic type CO sensor 10 even when a continuous combustion time is longer than a given continuous combustion reference time after a stabilizing time. Based on the detection result for abnormality of CO concentration by the solid electrolytic type CO sensor 10, the abnormality cutoff control means 11B effects control of cutoff of the gas combustion device.

5. 发明专利

JP2000206086A HYDROGEN GAS SENSOR AND ITS MANUFACTURING METHOD 失效
公开(公告)号：JP2000206086A
公开(公告)日：2000-07-28
申请号：JP531399
申请日：1999-01-12
申请人： TOKYO GAS CO LTD , YAZAKI CORP
发明人： NAKAMURA KENICHI , TANDA RYOJI , MOCHIZUKI KAZU , TAKASHIMA HIROMASA
IPC分类号： G01N27/409 , G01N27/416
摘要： PROBLEM TO BE SOLVED: To measure the concentration of a hydrogen gas without being affected by other kinds of combustible gases by executing silicon treatment to a hydrogen gas sensor with a solid electrolyte type sensor element. SOLUTION: Porous platinum electrodes 1a and 1b are provided on one surface of a solid electrolyte layer 3 that is composed of stabilization zirconia containing, for example, 8 mol.% yttrium oxide Y2O3. An alumina insulation film for insulation is arranged on the other surface of the sold electrolyte layer 3, further a heater 5 comprising platinum is provided on it, and the solid electrolyte layer 3 can be heated to a temperature suitable to its ionic conduction. Also, a terminal part 6 for connection is provided on the solid electrolyte layer 3, and is connected by the electrodes 1a and 1b and a lead wire 7. By using such a sensor element, a hydrogen gas sensor with many advantages, high selectivity to the hydrogen gas, improved accuracy, a long life eliminating frequent maintenance and inspections, and further easy and inexpensive manufacture can be obtained.

6. 发明专利

JP2000012042A ACTIVE SITE INCREASED CERMET ELECTRODE AND MANUFACTURE OF THE CERMET ELECTRODE 失效
公开(公告)号：JP2000012042A
公开(公告)日：2000-01-14
申请号：JP17873598
申请日：1998-06-25
申请人： TOKYO GAS CO LTD , YAZAKI CORP
发明人： NAKAMURA KENICHI , TANDA RYOJI , MOCHIZUKI KAZU , TAKASHIMA HIROMASA
IPC分类号： G01N27/409 , H01M4/86 , H01M4/88
摘要： PROBLEM TO BE SOLVED: To provide a cermet electrode suppressing growth caused by sintering of Pt, increasing three phase interface, and increasing electrode activity. SOLUTION: A cermet electrode with increased active sites is made of a sintered porous body formed by almost uniformly intertwining Pt fine particles and YSZ fine particles which is zirconium dioxide (ZrO2) stabilized with yttria (Y2O3), and is manufactured by mixing the Pt fine particles, having an average particle size of 0.6 μm or less and the YSZ fine particles having an average particle size of 1 μm or less, and sintering the mixture.

7. 发明专利

JP2000304720A CARBON MONOXIDE SENSOR 失效
公开(公告)号：JP2000304720A
公开(公告)日：2000-11-02
申请号：JP11380399
申请日：1999-04-21
申请人： TOKYO GAS CO LTD , YAZAKI CORP
发明人： NAKAMURA KENICHI , TANDA RYOJI , MOCHIZUKI KAZU , TAKASHIMA HIROMASA
IPC分类号： G01N27/409 , G01N27/416
摘要： PROBLEM TO BE SOLVED: To make accurately detectable the concentration of carbon monoxide by bringing only a gas to be inspected through an anti-poisoning gas layer with a plurality of specific anti-poisoning gas material into contact with a solid-electrolyte sensor element. SOLUTION: The anti-poisoning gas layer 13 has at least one type out of granular silica gel, zirconia, ultra-stable zeolite, molecular sieve 5A, and powdered α-alumina. The layer is preferably as thick as 5-20 mm in the granular ultra-stable Y-type zeolite, 10 mm or longer in the granular silica gel, 10 mm or longer in the granular molecular sieve 5A, and 15 mm or longer in the granular zirconia. with a granular diameter of 50 mesh or larger and 2 mesh or less, a sufficient effect can be obtained, and the layer thickness is appropriately adjusted according to the effect and sensitivity. The layer is preferably as thick as 15 mm or longer and 20 mm or less in the case of the powered α-alumina. The anti-poisoning gas layer 13 is provided at the upper portion of a sensor cap 1, the upper and lower portions are covered with a mesh, and an anti- poisoning gas material is filled into the inside.

8. 发明专利

JP2000019151A SOLID ELECTROLYTE TYPE CO SENSOR 失效
公开(公告)号：JP2000019151A
公开(公告)日：2000-01-21
申请号：JP18607998
申请日：1998-07-01
申请人： TOKYO GAS CO LTD , YAZAKI CORP
发明人： TANDA RYOJI , NAKAMURA KENICHI , MOCHIZUKI KAZU , TAKASHIMA HIROMASA
IPC分类号： G01N27/409 , G01N27/416
摘要： PROBLEM TO BE SOLVED: To make a CO sensor mountable on a miniaturized hot water feeder without providing a special storage chamber by constituting the CO sensor to come into contact with gas through a gas diffusion control layer. SOLUTION: In this CO sensor, an alumina insulating film 15 is laminated on the surface of an alumina base 16 with a heater. and a thin film of a combustible gas oxidized catalyst 14 is laminated on its upper face. A thin film of solid electrolyte 12 is laminated on the upper face of an electrode 13 laminated on the upper face of the thin film, and an electrode 11 is laminated on its upper face. Both electrodes and the solid electrolyte 12 are covered with an inert propous layer 17 serving as a diffusion control layer. A CO detecting device with this CO sensor 1 built therein is mounted on a hot water feeder. Combustion exhaust gas generated in a burner 5 is exhausted to a flue 9 from an exhaust port 7 of a hot water feeder body 3 together with air blown in by a fan 4 and detected by the CO sensor 1 provided in the flue 9, through the porous layer 17. The CO detecting device 2 processes the output of the CO sensor 1 and performs alarm sound output, cleaning treatment action and detected data display.

9. 发明专利

JP2000009682A SOLID-ELECTROLYTE THICK-FILM LAMINATION-TYPE CARBON MONOXIDE SENSOR 失效
公开(公告)号：JP2000009682A
公开(公告)日：2000-01-14
申请号：JP17873498
申请日：1998-06-25
申请人： TOKYO GAS CO LTD , YAZAKI CORP
发明人： NAKAMURA KENICHI , TANDA RYOJI , MOCHIZUKI KAZU , TAKASHIMA HIROMASA
IPC分类号： G01N27/406 , G01N27/416
摘要： PROBLEM TO BE SOLVED: To provide a CO sensor by which CO in a low-concentration region can be detected. SOLUTION: A solid-electrolyte thick-film lamination-type carbon monoxide sensor is composed of a gas diffusion layer 7 which is formed on a heating element 93 and which is composed of a flammable-gas oxidation catalyst. It is composed of a lower-part electrode 5 which is formed on the gas diffusion layer 7 and which is composed of a cermet as a composite substance which is formed by mixing a catalyst metal with a ceramic so as to be pressurized, molded and sintered. It is composed of a solid-electrolyte thick film 1 which is formed on the electrode 5 and which is oxygen-ion conductive. In addition, it is composed of an upper-part electrode 3 which is formed on the solid- electrolyte thick film 1 and which is composed of a cement. In the carbon monoxide sensor, the cermet which constitutes the electrodes 3, 5 is constituted of a composite material by a ceramic at a particle size of 10 μm or lower and by a catalyst metal, and the gas diffusion layer 7 is constituted of a porous substance having a catalytic action to oxidize a flammable gas.

10. 发明专利

JP2002048747A CARBON MONOXIDE SENSOR COMPOSITE ELEMENT, CARBON MONOXIDE CONCENTRATION METER, AND CARBON MONOXIDE SENSOR 失效
公开(公告)号：JP2002048747A
公开(公告)日：2002-02-15
申请号：JP2000205538
申请日：2000-07-06
申请人： TOKYO GAS CO LTD , YAZAKI CORP
发明人： NAKAMURA KENICHI , TANDA RYOJI , MOCHIZUKI KAZU , TAKASHIMA HIROMASA
IPC分类号： G01N27/409 , G01N27/12 , G01N27/16 , G01N27/416
摘要： PROBLEM TO BE SOLVED: To provide a carbon monoxide sensor element allowed to be miniaturized and to perform accurate measurement over a wide concentration range from a low concentration to a high concentration. SOLUTION: This carbon monoxide sensor composite element is provided with a solid electrolyte type sensor element part and a contact combustion type sensor detection part.

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