JPH0227298U - - Google Patents
Info
- Publication number
- JPH0227298U JPH0227298U JP10238488U JP10238488U JPH0227298U JP H0227298 U JPH0227298 U JP H0227298U JP 10238488 U JP10238488 U JP 10238488U JP 10238488 U JP10238488 U JP 10238488U JP H0227298 U JPH0227298 U JP H0227298U
- Authority
- JP
- Japan
- Prior art keywords
- gas
- sensor
- alarm
- circuit
- current
- 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 9
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 5
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Landscapes
- Emergency Alarm Devices (AREA)
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Description
第1図はこの考案の一実施例を示す回路図、第
2図は、第1図の実施例におけるバイパス回路の
詳細図、第3図はこの考案の他の実施例を示す回
路図、第4図は、第3図の実施例における電圧―
電流変換回路の詳細図、第5図a,b,cはこの
考案のガス検知部を防爆型とした実施例の側断面
図および第5図aのX―X線による断面図および
Y―Y線による断面図、第6図a,bは、第5図
中のプリント基板部分の詳細を示す平面図および
側面図、第7図は従来のガス警報器の一例を示す
回路図である。
図中、10はガス検知部、11はガスセンサ、
12は補償素子、13,14は抵抗器、15は取
付板、16はプリント基板、17は金網、20は
指示警報部、21は電源回路、22は警報回路、
30は線路、31は信号線、40はバイパス回路
、41〜44は抵抗器、45は定電圧ダイオード
、46は比較器、47はトランジスタ、50は電
圧―電流変換回路、51,52は比較器、53は
トランジスタ、54〜57は抵抗器、60はガス
検知部、61はセンサケース、62はフレームア
レスタ、63,64はセンサガイド、65は電気
室蓋、66はパツキン、67は樹脂固着部、は
センサ室、は電気室である。
Fig. 1 is a circuit diagram showing one embodiment of this invention, Fig. 2 is a detailed diagram of a bypass circuit in the embodiment of Fig. 1, and Fig. 3 is a circuit diagram showing another embodiment of this invention. Figure 4 shows the voltage in the embodiment of Figure 3.
Detailed diagrams of the current conversion circuit, Figures 5a, b, and c are side sectional views of an embodiment in which the gas detection section of this invention is explosion-proof, and sectional views taken along line X--X in Figure 5a and Y--Y. 6a and 6b are a plan view and side view showing details of the printed circuit board portion in FIG. 5, and FIG. 7 is a circuit diagram showing an example of a conventional gas alarm. In the figure, 10 is a gas detection unit, 11 is a gas sensor,
12 is a compensation element, 13 and 14 are resistors, 15 is a mounting plate, 16 is a printed circuit board, 17 is a wire mesh, 20 is an indicator/alarm unit, 21 is a power supply circuit, 22 is an alarm circuit,
30 is a line, 31 is a signal line, 40 is a bypass circuit, 41 to 44 are resistors, 45 is a constant voltage diode, 46 is a comparator, 47 is a transistor, 50 is a voltage-current conversion circuit, 51 and 52 are comparators , 53 is a transistor, 54 to 57 are resistors, 60 is a gas detection section, 61 is a sensor case, 62 is a flame arrester, 63 and 64 are sensor guides, 65 is an electric chamber cover, 66 is a gasket, and 67 is a resin fixing section. , is the sensor room, and is the electrical room.
Claims (1)
ス検知部に線路を介して電流を供給する電源回路
と、前記ガス検知部の出力により作動する指示計
または/および警報回路とを備えた指示警報部と
からなるガス警報器において、前記ガス検知部内
に前記ガスセンサの電流の変化を検出し、前記ガ
スセンサの印加電圧を一定に保つバイパス回路を
設けたことを特徴とするガス警報器。 (2) ガス検知部の内部において、ガスセンサの
出力電圧を電流出力に変換する電圧―電流変換回
路を備えたことを特徴とする請求項(1)記載のガ
ス警報器。 (3) 請求項(1)または(2)に記載のガス警報器に
おいて、ガス検知部の内部にガスセンサと、バイ
パス回路または/および電圧―電流変換回路を備
えたプリント基板にコネクタの端子部を形成した
プラグイン構造のセンサユニツトを備えたことを
特徴とするガス警報器。 (4) 請求項(1)〜(3)のいずれかに記載のガス警
報器において、ガスセンサをフレームアレスタで
囲み、センサケース内に前記ガスセンサとプリン
ト基板上のバイパス回路または/および電圧―電
流変換回路との間に樹脂固着部を設け、センサ室
と電気室に分離した構造のセンサユニツトを特徴
とするガス警報器。[Claims for Utility Model Registration] (1) A gas detection section equipped with a gas sensor, a power supply circuit that supplies current to the gas detection section via a line, and an indicator or/and which is operated by the output of the gas detection section. and an indicator/alarm unit having an alarm circuit, characterized in that a bypass circuit is provided in the gas detection unit to detect a change in the current of the gas sensor and maintain a constant voltage applied to the gas sensor. gas alarm. (2) The gas alarm according to claim (1), further comprising a voltage-current conversion circuit that converts the output voltage of the gas sensor into a current output inside the gas detection section. (3) In the gas alarm according to claim (1) or (2), the terminal part of the connector is connected to a printed circuit board that includes a gas sensor, a bypass circuit, and/or a voltage-current conversion circuit inside the gas detection part. A gas alarm comprising a sensor unit having a plug-in structure. (4) In the gas alarm according to any one of claims (1) to (3), the gas sensor is surrounded by a flame arrester, and the gas sensor and a bypass circuit or/and voltage-current converter on a printed circuit board are installed in a sensor case. A gas alarm that features a sensor unit that is separated into a sensor chamber and an electrical chamber by providing a resin-fixed part between the sensor unit and the circuit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1988102384U JPH082798Y2 (en) | 1988-08-03 | 1988-08-03 | Gas alarm |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1988102384U JPH082798Y2 (en) | 1988-08-03 | 1988-08-03 | Gas alarm |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0227298U true JPH0227298U (en) | 1990-02-22 |
JPH082798Y2 JPH082798Y2 (en) | 1996-01-29 |
Family
ID=31332247
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1988102384U Expired - Lifetime JPH082798Y2 (en) | 1988-08-03 | 1988-08-03 | Gas alarm |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH082798Y2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2020025025A (en) * | 2018-08-07 | 2020-02-13 | 横河電機株式会社 | Explosion-proof construction |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55125443A (en) * | 1979-03-16 | 1980-09-27 | Cerberus Ag | Gas detector to be used in environment of explosion danger |
JPS5747915U (en) * | 1980-09-04 | 1982-03-17 | ||
JPS57189289A (en) * | 1981-05-15 | 1982-11-20 | Toubishi Kogyo Kk | Gas detection monitor |
-
1988
- 1988-08-03 JP JP1988102384U patent/JPH082798Y2/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55125443A (en) * | 1979-03-16 | 1980-09-27 | Cerberus Ag | Gas detector to be used in environment of explosion danger |
JPS5747915U (en) * | 1980-09-04 | 1982-03-17 | ||
JPS57189289A (en) * | 1981-05-15 | 1982-11-20 | Toubishi Kogyo Kk | Gas detection monitor |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2020025025A (en) * | 2018-08-07 | 2020-02-13 | 横河電機株式会社 | Explosion-proof construction |
CN110829684A (en) * | 2018-08-07 | 2020-02-21 | 横河电机株式会社 | Explosion-proof structure |
US11018485B2 (en) | 2018-08-07 | 2021-05-25 | Yokogawa Electric Corporation | Explosion-proof structure |
CN110829684B (en) * | 2018-08-07 | 2021-08-13 | 横河电机株式会社 | Explosion-proof structure |
Also Published As
Publication number | Publication date |
---|---|
JPH082798Y2 (en) | 1996-01-29 |
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