JPH03116488U - - Google Patents
Info
- Publication number
- JPH03116488U JPH03116488U JP2344090U JP2344090U JPH03116488U JP H03116488 U JPH03116488 U JP H03116488U JP 2344090 U JP2344090 U JP 2344090U JP 2344090 U JP2344090 U JP 2344090U JP H03116488 U JPH03116488 U JP H03116488U
- Authority
- JP
- Japan
- Prior art keywords
- gas
- metal oxide
- oxide semiconductor
- resistance value
- state
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims description 8
- 230000005856 abnormality Effects 0.000 claims description 3
- 229910044991 metal oxide Inorganic materials 0.000 claims 4
- 150000004706 metal oxides Chemical class 0.000 claims 4
- 239000004065 semiconductor Substances 0.000 claims 4
- 230000002159 abnormal effect Effects 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 claims 1
- 230000007704 transition Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 2
Landscapes
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Emergency Alarm Devices (AREA)
Description
第１図は実施例の回路図、第２図は実施例に用
いるマイクロコンピユータの回路図、第３図は実
施例の動作シーケンスを示すフローチヤートであ
る。第４図はヒートクリーニング動作の波形図、
第５図はヒートクリーニングの動作シーケンスを
示すフローチヤートである。第６図は実施例の動
作モードの決定を示すフローチヤート、第７図は
検出パラメータＩ１〜Ｉ５の決定を示すフローチ
ヤートである。第８図は基準値Ｒ０の更新を示す
動作フローチヤート、第９図は基準値Ｒ０の更新
を示す波形図である。第１０図はガスの検出とガ
ス濃度の表示とを示すフローチヤート、第１１図
、第１２図はガス濃度の表示を示す波形図である
。第１３図は、トラブルの検出を示すフローチヤ
ート、第１４図はガスセンサの異常検出を示す波
形図である。第１５図はデモンストレーシヨン・
モードの波形図、第１６図はデモンストレーシヨ
ン・モードのフローチヤートである。
図において、２……マイクロコンピユータ、４
……ガスセンサ、５０……ＬＥＤレベルメータ、
５２……ブザー、Ｒｓ……センサ抵抗、Ｒ０……
基準値。
FIG. 1 is a circuit diagram of the embodiment, FIG. 2 is a circuit diagram of a microcomputer used in the embodiment, and FIG. 3 is a flowchart showing the operation sequence of the embodiment. Figure 4 is a waveform diagram of heat cleaning operation.
FIG. 5 is a flowchart showing the operation sequence of heat cleaning. FIG. 6 is a flowchart showing the determination of the operation mode of the embodiment, and FIG. 7 is a flowchart showing the determination of the detection parameters I1 to I5 . FIG. 8 is an operation flowchart showing the updating of the reference value R0 , and FIG. 9 is a waveform diagram showing the updating of the reference value R0 . FIG. 10 is a flowchart showing gas detection and gas concentration display, and FIGS. 11 and 12 are waveform diagrams showing gas concentration display. FIG. 13 is a flowchart showing trouble detection, and FIG. 14 is a waveform chart showing abnormality detection of the gas sensor. Figure 15 shows the demonstration.
The mode waveform diagram, FIG. 16, is a flowchart of the demonstration mode. In the figure, 2...microcomputer, 4
...Gas sensor, 50...LED level meter,
52... Buzzer, Rs... Sensor resistance, R 0 ...
Reference value.
Claims (1)
と、金属酸化物半導体の加熱用ヒータとを設けた
ガスセンサを用い、金属酸化物半導体の抵抗値の
変化からガスを検出すると共に、金属酸化物半導
体の抵抗値の異常増加から、ガスセンサの異常を
検出するようにしたガス検出装置において、 ガスセンサの異常検出後の通常検出状態への復
帰を阻止する手段を設け、ガスセンサの抵抗値が
異常増加状態から正常状態へ移行した後も、通常
検出状態への復帰を阻止するようにしたことを特
徴とする、ガス検出装置。[Claim for Utility Model Registration] Detecting gas from the change in resistance of the metal oxide semiconductor using a gas sensor equipped with a metal oxide semiconductor whose resistance value changes depending on gas and a heater for heating the metal oxide semiconductor. In addition, in a gas detection device configured to detect an abnormality in a gas sensor based on an abnormal increase in the resistance value of a metal oxide semiconductor, a means is provided to prevent the gas sensor from returning to a normal detection state after an abnormality is detected. A gas detection device characterized in that a return to a normal detection state is prevented even after the resistance value transitions from an abnormally increased state to a normal state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990023440U JP2547855Y2 (en) | 1990-03-08 | 1990-03-08 | Gas detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990023440U JP2547855Y2 (en) | 1990-03-08 | 1990-03-08 | Gas detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03116488U true JPH03116488U (en) | 1991-12-03 |
| JP2547855Y2 JP2547855Y2 (en) | 1997-09-17 |
Family
ID=31526425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990023440U Expired - Lifetime JP2547855Y2 (en) | 1990-03-08 | 1990-03-08 | Gas detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2547855Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6140937A (en) * | 1984-07-31 | 1986-02-27 | 末松 大吉 | Construction of block for culvert |
-
1990
- 1990-03-08 JP JP1990023440U patent/JP2547855Y2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6140937A (en) * | 1984-07-31 | 1986-02-27 | 末松 大吉 | Construction of block for culvert |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2547855Y2 (en) | 1997-09-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0351376U (en) | ||
| JPH03116488U (en) | ||
| JPH03116490U (en) | ||
| JPH03116489U (en) | ||
| JPH0463903U (en) | ||
| JPS61189259U (en) | ||
| JPS6098055U (en) | CO gas detection device | |
| JPH02120062U (en) | ||
| JPH0241741Y2 (en) | ||
| JPH06100560B2 (en) | Gas detector | |
| JPH0749233Y2 (en) | Incomplete combustion detector | |
| JPS61140958U (en) | ||
| JPH01311260A (en) | Gas detecting device | |
| JPH0738976Y2 (en) | Integrated circuit device for heating cooker | |
| JPS6113253U (en) | Remaining hot water amount display device for hot water storage type electric water heater | |
| JPH02140113U (en) | ||
| JPH0257046U (en) | ||
| JPS6327864U (en) | ||
| JPS6434556U (en) | ||
| JPH01125966U (en) | ||
| JPS6166377U (en) | ||
| JPH0227164U (en) | ||
| JPS62159622A (en) | Electric rice cooker | |
| JPS6444455U (en) | ||
| JPS61170062U (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |