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重庆煤矿安全仪器厂生产的 AYJ—1型瓦斯遥测警报仪,在使用过程中常发生以下现象:一对黑白催化元件使用一段时间后(这时黑白元件并没有失效损坏,可继续使用),在主机停电再送电时,探头输出一比较大的正冲信号,引起误报警,甚至误断电。根据测定,这个正冲信号一般在20s 左右即可消失,40s 左右主机可进入正常工作指示状态。为了解决 AYJ—1型瓦斯遥测警报仪主机送电时引起的误报警和误断电,我们研制了一个主机延时指示电路(参见电路图)。该电路所用元件少,可直接装入主机内,不需另设装置盒。如无有此延时指示电路,在
AYJ-1 gas telemetry alarm device produced by Chongqing Coal Mine Safety Instrument Factory often occurs the following phenomena in the process of using: After a period of use of a pair of black-and-white catalytic components (when the black-and-white components are not damaged and can be used continuously), the host Power failure and then power transmission, the probe output a relatively large positive pulse signal, causing false alarms, or even power failure. According to the measurement, the positive pulse signal generally disappear in about 20s, 40s or so host can enter the normal working instructions state. In order to solve the AYJ-1 gas telemetering alarm host caused false alarm and power failure, we developed a host delay indication circuit (see circuit diagram). The circuit components used less, can be directly into the host, no separate device box. Without this delay indication circuit, at