JPH0241742Y2 - - Google Patents
Info
- Publication number
- JPH0241742Y2 JPH0241742Y2 JP1982108747U JP10874782U JPH0241742Y2 JP H0241742 Y2 JPH0241742 Y2 JP H0241742Y2 JP 1982108747 U JP1982108747 U JP 1982108747U JP 10874782 U JP10874782 U JP 10874782U JP H0241742 Y2 JPH0241742 Y2 JP H0241742Y2
- Authority
- JP
- Japan
- Prior art keywords
- gas leak
- circuit
- external output
- signal
- voltage
- 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.)
- Expired
Links
- 238000012544 monitoring process Methods 0.000 claims description 25
- 238000001514 detection method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
Description
【考案の詳細な説明】
本考案は、ガスもれ警報システムに関し、特に
被検出場所に備えられたガスもれ警報器の出力信
号を集中監視盤へ伝送させる外部出力回路に関す
る。[Detailed Description of the Invention] The present invention relates to a gas leak alarm system, and particularly to an external output circuit that transmits an output signal from a gas leak alarm installed at a detection location to a central monitoring panel.
従来のガスもれ警報システムにおいて、ガスも
れ警報器として、たとえば第１図に示したよう
に、警報回路１および集中監視盤とのインターフ
エースの作用をする外部出力回路２を備えたもの
がある。ここに詳細回路を例示した外部出力回路
２は、制御トランジスタ３と、２つのツエナーダ
イオード４，５と、バイアス抵抗６と、トランジ
スタの如きスイツチ素子７とを主として包含し、
通常のガスもれ待機状態では警報回路１がスイツ
チ素子７を閉じるよう制御してツエナーダイオー
ド４に基づく有電圧信号を出力端子８，９に与
え、ガスもれ警報状態では警報回路１がスイツチ
素子７を開くよう制御してツエナーダイオード４
および５に基づく有電圧信号を出力端子８，９に
与えるようにし、一方、集中監視盤ではこれら２
つの有電圧信号を識別するようにするとともにゼ
ロ電圧を検出するよう構成して信号線路の断線を
も監視することを意図して構成したものである。
なお、符号１０および１１は警報回路１および外
部出力回路２へ給電するための電源端子である。 In conventional gas leak alarm systems, the gas leak alarm is equipped with an alarm circuit 1 and an external output circuit 2 that acts as an interface with a central monitoring panel, as shown in FIG. be. The external output circuit 2 whose detailed circuit is illustrated here mainly includes a control transistor 3, two Zener diodes 4 and 5, a bias resistor 6, and a switch element 7 such as a transistor.
In the normal gas leak standby state, the alarm circuit 1 controls the switch element 7 to close and provides a voltage signal based on the Zener diode 4 to the output terminals 8 and 9. In the gas leak alarm state, the alarm circuit 1 closes the switch element 7. Zener diode 4 is controlled to open 7.
and 5 are applied to the output terminals 8 and 9. On the other hand, on the central monitoring board, these 2
This system is designed to identify two voltage signals and to detect zero voltage, so as to monitor disconnection of the signal line.
Note that reference numerals 10 and 11 are power supply terminals for supplying power to the alarm circuit 1 and the external output circuit 2.
このようなガスもれ警報器においては負極の外
部出力端子９と電源端子１１とは共通に接続され
ているのが常である。また集中監視盤側でも同様
に両者の負極を共通に接続されることがある。 In such a gas leak alarm, the negative external output terminal 9 and the power supply terminal 11 are usually connected in common. Also, on the central monitoring board side, the negative terminals of both may be connected in common.
第１図のガスもれ警報器を電源および信号線路
を介して集中監視盤に接続される場合を考えてみ
る。第２図はその等価回路であつて、符号Epはガ
スもれ警報器に給電する電源電圧を示し、Eaは
外部出力回路２がその出力端子８，９に供給する
有電圧信号の電圧、Riは集中監視盤の入力インピ
ーダンス、RLは警報回路１の回路インピーダン
ス、R1は電源線の線路抵抗、R2は信号線の線路
抵抗、そしてE1，E2，E3，Eb，Ec，Edは線路抵
抗およびインピーダンス間の電圧降下をそれぞれ
示し、さらにＩは電源電流、ｉは信号電流を示し
ている。集中監視盤側で負極の線を共通に接続さ
れる場合を符号１２により破線で示してある。 Consider the case where the gas leak alarm shown in FIG. 1 is connected to a central monitoring board via a power supply and signal line. Figure 2 shows its equivalent circuit, where the symbol E p indicates the power supply voltage that supplies power to the gas leak alarm, and E a indicates the voltage of the voltage signal that the external output circuit 2 supplies to its output terminals 8 and 9. , R i is the input impedance of the central monitoring board, R L is the circuit impedance of alarm circuit 1, R 1 is the line resistance of the power line, R 2 is the line resistance of the signal line, and E 1 , E 2 , E 3 , E b , Ec , and Ed represent the line resistance and voltage drop between impedances, respectively, I represents the power supply current, and i represents the signal current. The case where the negative electrode wires are commonly connected on the central monitoring panel side is indicated by a broken line with reference numeral 12.
集中監視盤においては、信号線と電源線との負
極の線を共通に接続しない場合、外部出力回路２
より供給されて集中監視盤にて受ける信号電圧Ec
は次のように表わされる。 In the centralized monitoring board, if the negative terminal wire of the signal line and the power supply line are not connected in common, the external output circuit 2
The signal voltage E c supplied from the central monitoring board and received by the central monitoring board
is expressed as follows.
Ec＝Ea−Eb−Ed
一般に信号電流ｉは電源電流Ｉに比べて非常に
小さいので、その信号電流ｉによる線路抵抗R2
の電圧降下は無視することができるので、
Ec≒Ea
となり、集中監視盤で共通接続しない場合は何ら
悪影響はない。 E c = E a −E b −E dGenerally , the signal current i is very small compared to the power supply current I, so the line resistance R 2 due to the signal current i
Since the voltage drop in can be ignored, E c ≒ E a , and there will be no adverse effect if no common connection is made with a centralized monitoring board.
集中監視盤において、符号１２で示すように負
極の線を共通接続した場合、信号電圧Ecは
Ec＝Ea−Eb−Ed＋E3≒Ea＋E3
となる。ここでE3は
E3＝R1×１
で表わされ、この電源電流Ｉは信号電流ｉに比較
して大きいので、この電圧E3は無視することは
できない。 In the centralized monitoring board, when the negative electrode wires are commonly connected as shown by reference numeral 12, the signal voltage E c becomes E c =E a −E b −E d +E 3 ≈E a +E 3 . Here, E 3 is expressed as E 3 =R 1 ×1, and since this power supply current I is larger than the signal current i, this voltage E 3 cannot be ignored.
したがつて、集中監視盤入力は警報器の外部出
力回路２の信号電圧Eaに対し電圧E3だけ浮いた
信号となり、監視盤の判別回路に誤信号を与えて
しまうことがある。これは線路長が長くなるほど
また信号電圧Eaが低いほど影響が大きい。 Therefore, the central monitoring panel input becomes a signal that is higher than the signal voltage E a of the external output circuit 2 of the alarm by a voltage E 3 , which may give an erroneous signal to the discrimination circuit of the monitoring panel. This effect increases as the line length increases and as the signal voltage E a decreases.
本考案は上記事情に鑑みてなされたもので、集
中監視盤において信号回路と電源回路との片方の
極性の線を共通にしたとしても上記不具合を発生
しないようにすることを目的とする。 The present invention has been made in view of the above circumstances, and aims to prevent the above-mentioned problems from occurring even if one side of the signal circuit and the power supply circuit in a central monitoring board have a common polarity line.
以下第３図に例示した本考案の好適な実施例に
ついて詳述する。なお、第３図において第１図と
同じ部材は同じ参照符号で示してある。 A preferred embodiment of the present invention illustrated in FIG. 3 will be described in detail below. In FIG. 3, the same members as in FIG. 1 are designated by the same reference numerals.
本考案によれば、外部出力回路２の外部出力端
子９と電源入力端子１１との間にダイオード１３
を設けて信号回路と電源回路とを分離している。
この結果、電源電流Ｉと線路抵抗R1とによつて
生ずる電源線路の電圧降下E3の影響が阻止され、
監視盤の電源回路および信号回路の負極の線を共
通にしたとしても、第４図から明らかな如く監視
盤入力電圧Ecは
Ec＝Ea−Eb−Ed≒Ea
となり、ガスもれ警報器からの外部出力電圧を忠
実に入力することができる。 According to the present invention, a diode 13 is connected between the external output terminal 9 and the power input terminal 11 of the external output circuit 2.
is provided to separate the signal circuit and power supply circuit.
As a result, the influence of the voltage drop E 3 on the power supply line caused by the supply current I and the line resistance R 1 is prevented,
Even if the negative terminal wire of the power supply circuit and the signal circuit of the monitoring panel are made common, as is clear from Fig. 4, the input voltage E c of the monitoring panel becomes E c = E a −E b −E d ≒ E a The external output voltage from the leak alarm can be input faithfully.
本考案によれば、電源線の線路抵抗の影響がな
いのでガスもれ警報器と集中監視盤との距離に関
係なくガスもれ警報器の外部出力電圧信号を監視
盤へ送信することができる。 According to the present invention, the external output voltage signal of the gas leak alarm can be transmitted to the monitoring panel regardless of the distance between the gas leak alarm and the central monitoring panel since there is no influence of the line resistance of the power line. .
従来の監視盤はほとんど信号回路と電源回路と
の負極の線が共通になつているが、本考案による
ガスもれ警報器は監視盤のそのような形式に関係
なく、いずれの監視盤とも連動させることができ
る。 Most conventional monitoring panels have a common negative wire for the signal circuit and power circuit, but the gas leak alarm according to the present invention can be linked to any monitoring panel, regardless of the type of monitoring panel. can be done.
さらに、電源線の線路抵抗の影響は外部出力信
号の電圧Eaが低いものほど大きいが、本考案に
よればそのような影響はないので低圧の外部出力
信号を採用したガスもれ集中監視システムにも容
易に適用することができる。 Furthermore, the influence of the line resistance of the power line is greater as the voltage E a of the external output signal is lower, but according to the present invention, there is no such influence, so a gas leak centralized monitoring system that uses a low voltage external output signal is possible. It can also be easily applied.
また、好適な実施例では、検出待機時および警
報時に異なる値の有電圧信号を送信するようにし
た外部出力回路の例を示したが、本考案は電圧信
号を送信する形式の出力回路であればいずれにも
適用することができる。 Furthermore, in the preferred embodiment, an example of an external output circuit that transmits voltage signals of different values during detection standby and during alarm is shown, but the present invention is applicable to any type of output circuit that transmits voltage signals. It can be applied to either case.
第１図は従来のガスもれ警報器を例示する回路
図、第２図は第１図のガスもれ警報器を含む警報
システムの等価回路図、第３図は本考案によるガ
スもれ警報器を示す図、第４図は第２図と同様の
図である。
１……警報回路、２……外部出力回路、３……
トランジスタ、４，５……ツエナーダイオード、
６……抵抗、７……スイツチ素子、８，９……出
力端子、１０，１１……電源端子、１２……共通
線、１３……ダイオード。
Fig. 1 is a circuit diagram illustrating a conventional gas leak alarm, Fig. 2 is an equivalent circuit diagram of an alarm system including the gas leak alarm of Fig. 1, and Fig. 3 is a gas leak alarm according to the present invention. The figure showing the container, FIG. 4, is the same as FIG. 2. 1...Alarm circuit, 2...External output circuit, 3...
Transistor, 4, 5... Zener diode,
6... Resistor, 7... Switch element, 8, 9... Output terminal, 10, 11... Power supply terminal, 12... Common line, 13... Diode.
Claims (1)
生させて集中監視盤へ伝送するガスもれ警報器の
外部出力回路において、共通に接続されていた外
部出力回路の一方の信号線と集中監視盤からガス
もれ警報器へ給電する電源線の一方の線との間に
順方向にダイオードを設けたことを特徴とする、
ガスもれ警報器の外部出力回路。 In the external output circuit of a gas leak alarm that generates a voltage signal with a value according to the gas leak detection status and transmits it to the central monitoring panel, one signal line of the commonly connected external output circuit and the central It is characterized by a diode installed in the forward direction between the power supply line that supplies power from the monitoring panel to the gas leak alarm.
External output circuit for gas leak alarm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10874782U JPS5915195U (en) | 1982-07-20 | 1982-07-20 | Gas leak alarm external output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10874782U JPS5915195U (en) | 1982-07-20 | 1982-07-20 | Gas leak alarm external output circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5915195U JPS5915195U (en) | 1984-01-30 |
| JPH0241742Y2 true JPH0241742Y2 (en) | 1990-11-07 |
Family
ID=30253591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10874782U Granted JPS5915195U (en) | 1982-07-20 | 1982-07-20 | Gas leak alarm external output circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5915195U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5652554U (en) * | 1979-09-29 | 1981-05-09 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52156472U (en) * | 1976-05-24 | 1977-11-28 | ||
| JPS53163084U (en) * | 1977-05-30 | 1978-12-20 |
-
1982
- 1982-07-20 JP JP10874782U patent/JPS5915195U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5652554U (en) * | 1979-09-29 | 1981-05-09 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5915195U (en) | 1984-01-30 |
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