Automatic exhaust fan control coupled to gas leak detection

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 more higher along with the gas concentration rising. Please use simple electro circuit, Convert change of conductivity to correspond output signal of gas concentration. MQ-6 gas sensor has high sensitity 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. Gas leak detection is the process of identifying potentially hazardous gas leaks by means of various sensors. These sensors usually employ an audible alarm to alert people when a dangerous gas has been detected. Common sensors used today include Infrared Point Sensor, Ultrasonic gas detectors, Electrochemical gas detectors, and Semiconductor Sensors. These sensors are used for a wide range of applications, and can be found in industrial plants, refineries, wastewater treatment facilities, vehicles, and around the home.

Gas leak detection methods became a concern after the effects of harmful gases on human health were discovered. Before modern electronic sensors, early detection methods relied on less precise detectors. Through the 19th and early 20th centuries, coal miners would bring canaries down to the tunnels with them as an early detection system against life threatening gases such as carbon dioxide, carbon monoxide and methane. The canary, normally a very songful bird, would stop singing and eventually die in the presence of these gases, signaling the miners to exit the mine quickly. Before the development of electronic household carbon monoxide detectors in the 1980s and 90s, carbon monoxide presence was detected with a chemically infused paper that turned brown when exposed to the gas. Since then, many technologies and devices have been developed to detect, monitor, and alert the leakage of a wide array of gases.

In the kitchen where boiling water and cooking produces steam, the cooling steam turns into water that can cause condensation on walls, ceilings and around windows. When this is happening on a daily basis, especially during winter, mould and mildew can begin to form which can have an unpleasant odour but can also be harmful to your health.

In this project we are going to design the circuit to control the exhaust fan speed automatically according to the temperature in the room. Fan speed control is based on adjusting the voltage which gets to the fan. Fan speed control has been possible for many decades by using adjustable power resistors and adjustable transformers. Those methods have been used in movie theatres, houses and other public places.

Block Diagram:

POWER SUPPLY:

ADVANTAGES:

 .To protect from harmful gas leakage.

 .low cast.

 High sensitivity to Propane, Butane and LPG

APPLICATIONS:

 Used in homes an hotels.

 Used in industries.

 It has wide application in various security system

For Details Contact: A.VINAY-9030333433, 0877-2261612