Gas Leak Detector Circuit
Here is a gas
leak detector circuit that detects the leakage of LPG gas and alerts the user
through audio-visual indications. The circuit operates off a 9V PP3 battery.
Zener diode ZD1 is used to convert 9V into 5V DC to drive the gas sensor module.
The gas leakage circuit uses
the SEN-1327 gas sensor module from RhydoLABZ. Its output goes high when
the gas level reaches or exceeds certain point. A preset in the module is used
to set the threshold. Interfacing with the sensor module is done through a
4-pin SIP header.
Pin details of the gas sensor
module are shown in Fig. 2. An MQ-6 gas sensor is used in the gas sensor
module. The sensor can also be used to detect combustible gases, especially
methane.
Gas leak detector schematic
Whenever there is LPG
concentration of 1000 ppm (parts per million) in the area, the OUT pin of the
sensor module goes high. This signal drives timer IC 555, which is wired as an
astable multivibrator. The multivibrator basically works as a tone generator.
Output pin 3 of IC 555 is
connected to LED1 and speaker-driver transistor SL100 through current-limiting
resistors R5 and R4, respectively. LED1 glows and the alarm sounds to alert the
user of gas leakage. The pitch of the tone can be changed by varying preset
VR1. Use a suitable heat-sink for transistor SL100.
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