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.pdf  1457513710-LGEC005LPGGASLeakagedetectionforcars1.pdf (Size: 116.76 KB / Downloads: 8)

This system helps you to upgrade your safety standards, comply statutory
requirements on environmental commitments and most important and basic function
being prevent accidents and protect life and property from disaster. In the past, it has
been a conventional practice to employ combustion apparatus such as a furnace,
heater, stove or LPG kit in cars, which utilizes a combustible vapor or gas to produce
heat energy when properly ignited. In the use of combustible apparatus in which a
combustible gas such as natural or liquid propane gas is burned in heating boilers,
domestic water heaters, ovens, stoves and the like, the apparatus or appliance is
generally of an automatic recycling type. That is to say, the equipment is generally in
operation for short periods of time after which is shut down for a short period of time.
The equipment has intermediate operation and the appliance is generally started and
stopped at the signal of an automatic controller, such as a thermostat, which may be
actuated by temperature, pressure, or the like. The LPG Kit installed is many times
installed inside the car creating possibilities of large accidents. This type of
appliance/Kits is normally unattended by any operating personnel, since it is
automatic in operation and, therefore, one hazard encountered in the use of such an
appliance is the possibility that during a standby period or a period in which it is not
in operation, a gas leak may occur thereby resulting in a large accumulation of
combustible gas which can produce an explosion if the detection is not quickly
noticed. Although some sophisticated detector means have been provided, it is
contemplated that the indicator means should be simple and economical so that the
entire system may be readily incorporated into mobile trailers, campers, boats and
other vehicles or living quarters having appliances dependent upon storage of
pressurized gas.
The primary objects of the present project to provide a novel means for safely
detecting any malfunction of a pressurized gas system in order to prevent
accumulation of combustible gases so that damage or explosion due to such an
accumulation of gases is prevented.
Another object of the present invention is to provide a novel safety means for
detecting the leakage of gas into the area of an appliance when the appliance is in a
shutdown condition and not in operation. Yet another object of the present invention
is to provide a novel gas detection and monitoring system which is economical to
manufacture and which may be readily installed in conventional trailers, boats or the
like which are normally dependent upon a stored supply of pressurized gas.
Typical installation areas being gas yards (Bullets), gas banks with multi cylinders in
manifold, user production departments / utility areas like kitchens.
Ideal sensor for use to detect the presence of a dangerous LPG leak in your car or in a
service station, storage tank environment. This unit can be easily incorporated into an
alarm unit, to sound an alarm or give a visual indication of the LPG concentration.
The sensor has excellent sensitivity combined with a quick response time. The sensor
can also sense iso-butane, propane, LNG and cigarette smoke.

MQ-6 gas sensor composed by micro AL2O3 ceramic tube, Tin Dioxide (SnO2)
sensitive layer, measuring electrode and heater are fixed into a crust made by plastic
and stainless steel net. The heater provides necessary work conditions for work of
sensitive components. The enveloped MQ-6 has 6 pin, 4 of them are used to fetch
signals, and other 2 are used for providing heating current.
DISPLAY UNIT: It is 16*2 LCD that shows the Tag ID number as instructed by the
The microcontroller used here is a common 8 bit Atmel microcontroller
AT89s8253.It is a low-power, high-performance CMOS 8-bit microcontroller
with12K bytes of In-System Programmable (ISP) Flash program memory and 2K
bytes of EEPROM data memory. It has 32 programmable input output lines.
• 12K Bytes of In-System Programmable (ISP) Flash Program Memory
– SPI Serial Interface for Program Downloading
– Endurance: 10,000 Write/Erase Cycles
• 2K Bytes EEPROM Data Memory
– Endurance: 100,000 Write/Erase Cycles
• 2.7V to 5.5V Operating Range
• Fully Static Operation: 0 Hz to 24 MHz (in x1 and x2 Modes)
• Three-level Program Memory Lock
• 256 x 8-bit Internal RAM
• 32 Programmable I/O Lines
• Three 16-bit Timer / Counters
• Nine Interrupt Sources
• Enhanced UART Serial Port with Framing Error Detection and Automatic Address
• Enhanced SPI (Double Write/Read Buffered) Serial Interface
• Programmable Watchdog Timer

Gas leak detection system
Fire/Safety detection system
Gas leak alarm
Gas detector
High sensitivity LPG, iso-butane, propane
Small sensitivity to alcohol, smoke
Fast response
Wide detection range
Stable performance and long life
Simple drive circuit
It also detect alcohol so it is used as liquor tester.
The sensor has excellent sensitivity combined with a quick response time.

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