The gas overranging alarm miner lamp 2

Published:2011/7/29 2:58:00 Author:Ecco | Keyword: gas overranging, alarm, miners lamp | From:SeekIC

The gas overranging alarm miner lamp described in the example is based on miner's lamp or miner's helmet. It couldflash in time to remind miners paying attention on safety. The working principle: The gas overranging alarm miner lamp circuit is composed of gasdetection circuit, controlled oscillator circuit and lighting circuit. It's shown as the figure 8-30. The gas detection circuit is composed of gas sensor, resistors Rl and potentiometer RP. The controlled oscillator circuit is composed of the potentiometer RP, a diode VD, transistors Vl-V3, resistor R2 and R3, capacitor Cl and C2 and the relay K. The lighting circuit is composed of the battery GB, lights EL, the constant moving contact of S and K light switch. The switch S turns off, EL will be lit. The end of the gas sensor detects methane gas, the place between A and B shows the state with high resistance, VD and V3 are in the OFF state, K is not action, miner working in the lighting condition.



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