Download high sensitive lpg sensor and gas leak with alert

HIGH SENSITIVE LPG SENSOR AND GAS LEAK WITH ALERT
BUZZER
ABSTRACT:
Sensitive material of MQ-6 gas sensor is SnO2, which with lower conductivity in clean
air. When the target combustible gas exist, the sensor’s conductivity is higher along with the gas
concentration rising. MQ-6 gas sensor has high senility to Propane, Butane and LPG, also
response to Natural gas. The sensor could be used to detect different combustible gas, especially
Methane; it is with low cost and suitable for different application.
LPG Gas Sensor (MQ6), ideal sensor for detect the presence of a dangerous LPG leak in
your Home, car or in a service station, storage tank environment. This unit can be easily
incorporate into an alarm unit, to sound an alarm or give a visual indication of the Combustible
Gas / LPG concentration. The sensor has excellent sensitivity combined with a quick response
time. The sensor can also sense is-butane, propane, LNG and cigarette smoke.
This LPG Gas Sensor can be used to make wireless Gas leak detector in home security
system this project is High Sensitivity to LPG, is-butane, propane. This also can sense to alcohol
and smoke, but with poor sensitivity. This project is designed to detect the LPG from 100parts
per million (PPM) to 10,000 PPM. Whenever LPG is detected, the sensor produces the output
voltage, which is depended on the amount of gas leakage. This voltage drives the transistor into
saturation region. A buzzer is connected to produce audible alert signal.
This project uses regulated 5V, 750mA power supply for charging the battery. 7805 three
terminal voltage regulator is used for voltage regulation. Bridge type full wave rectifier is used to
rectify the ac output of secondary of 230/18V step down transformer.
BLOCK DIAGRAM:
LPG Sensor
Sensitivity Control
Circuit
Transformer
Transfer
Driver Circuit
Buzzer
.
POWER SUPPLY:
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Step Down T/F
Bridge Rectifier
Filter
Voltage
Regulator
The input to the circuit is applied from the regulated power supply. The arc. input i.e., 230V
from the mains supply is step down by the transformer to 12V and is fed to a rectifier. The output
obtained from the rectifier is a pulsating dace voltage. So in order to get a pure dace voltage, the
output voltage from the rectifier is fed to a filter to remove any arc components present even
after rectification. Now, this voltage is given to a voltage regulator to obtain a pure constant dc
voltage.
ADVANTAGES:

Good sensitivity to Combustible gas in wide range

High sensitivity to Propane, Butane and LPG
 Long life and low cost

Simple drive circuit
APLICATIONS:

It has wide application in various security system
 It is used in Domestic gas leakage detector
 Industrial Combustible gas detector
 Portable gas detector