Gas Leakage Detector System System Presentation By Kaihatsu Techno Centre Pvt. Ltd.

Kaihatsu2 Introduction Compress Natural Gas (CNG) & Liquid Petroleum Gas (LPG) are common gases used in home & automobiles. Chemically, they are formed with the derivatives of Methane, Butane & Propane. Although they are very user friendly & less pollutants, they are hazardous if leakage occurs by any accident.

Kaihatsu3 Danger Zones In homes & automobiles, these gases are stored in one place and used at other place. They are often carried using pipelines. These pipelines are made up of rubber or have joints & bends. Over years these points wear out & gas leakage occurs.

Kaihatsu4 Accidents Spots These gases have Lower Explosive Limit. These means if the amount of Gas in the air increases more than certain percentage, the complete air becomes flammable. A slight spark by accident, will blow off everything. Where these Gases are used, sparks are too common. E.g. in automobile engine there is a spark plug generating a spark. In home, gas is used in kitchen where the flame is common.

Kaihatsu5 How to Detect Leakage? Leakage in Gas is detected using a Gas Sensor. These Sensors are pre- heated for 2.5 minutes. Their resistance inversely changes with the amount of gas, present in air. By monitoring the resistance, one can find out the gas leakage in air.

Why to Use Gas Leakage Detector Alarm System from Kaihatsu? Salient Features and Comparison with other products in Market. (All points may not be applicable to all products available in market)

Kaihatsu7 Microcontroller Driven – Full Digital Leakage detection level in other products is done using analogue resistance comparison by adjusting variable resistor (potentiometer or trim pot) Their value changes over time period & due to environmental effects. Hence, Leakage level shifts over the period of use. Kaihatsu system does not use any analogue values. The comparison values are stored in digital memory of microcontroller. Hence, no deteoretion of values over time and no environmental effect. Effect is always correct leakage level detection over any time frame.

Kaihatsu8 Accurate at all Temperature As one can see from the graph in slide 5, the leakage level shifts with the ambient temperature. In other products this shift is not accounted for. Hence the product works over restricted temperature range. Kaihatsu system used a thermister to detect ambient temperature. One thermister per sensor compensating ambient temperature effect. Effect is always correct leakage level detection over any temperature range from C to C.

Kaihatsu9 Sensor Failure Detection Once in million, there may be a chance that the sensor, heater in sensor or thermister may fail. In other products there is no failure detection system. Under this condition, even if there is a leakage, it will not be detected & a Cates trophy can occur. Remember Boeing theory, major accidents are due to two systems failure at same time. Kaihatsu system detects any failure in sensor or heater in sensor or thermister. This gives a warning, that although the case may be once a million, the detection system is incompetent to detect the leakage. Effect is the user is on alert when the detection system fails and can go for repairs or replacement.

Kaihatsu10 Early Leakage Warning Most of the product in the market has only one detection level. 5% of Lower Explosive Limit. Most of the cases leakage does not occur immediately. Due to slow wearing of tubes, a small leakage starts and then gradually reaches to the 5% level. In other products, this gradual increase is not detected and suddenly one fine day, the gas system stops. Kaihatsu system detects leakage level in Five steps. 1%, 2%, 3%, 4% and then 5%. Therefore in most of the cases, leakage is detected earlier. Effect is the user can take corrective measures when he or she has a time to attend and the automobile or home gas supply does not stop suddenly on one fine (or shall we call bad) day!

Kaihatsu11 Delayed Gas Supply Cut Off Most of the product in the market immediately cut off the gas supply as soon as the leakage level is reached. Imagine you are driving a car on the middle of the highway, leakage occurs and the car gas supply is cut off. A fetal accident can take place due to sudden stoppage of car. These accidents could be more dangerous than gas explosion itself! Kaihatsu system detects leakage level. If the leakage level reaches 5% of Lower Explosive Limit, it starts harsh audio alarm for indication. It then allows 2.5 minutes before it actually cuts off the gas supply. Effect is the user can safely pull over the car by the side of the road, stop the engine without causing any dangerous situation on highway.

Kaihatsu12 Plug & Play Duel Optional Sensor Most of the product in the market has only one sensor. May a times one needs to detect a leakage at two places. E.g. in automobiles one sensor is in main unit in engine & other unit near gas cylinder in dickey. Or in home main unit at kitchen & other unit at storage room where cylinders are stored. This feature is not available in most of the other products. One needs to purchase two units. Kaihatsu system has additional sensor input unit. This is a full plug & play system. Means second sensor can be purchased any time and can be just connected to system without any change or configuration adjustment. Best part is, second sensor comes with thermister so two sensors can work at different temperatures. Both sensors has failure detection systems

Kaihatsu13 Car or Home Changeable Design Most of the products in the market can be used either for home or for cars. Kaihatsu system has a unique design that can be changed from home use to car use & vice Vesa any time, without need of any technical expertise.

Kaihatsu14 Mechanical Most of the products in the market use normal plastic enclosure and normal wires. Kaihatsu system uses industrial grade enclosures and fire retardant wires for better safety.

Kaihatsu15 We Hope that You like this Product

Thank you Kaihatsu Techno Centre Pvt. Ltd. 2005