SI-100D is a simple combustible (LNG/LPG) gas leak detector with a catalytic bead sensor that consists of a sensing unit and receiver. SI-100D is used to detect gas leaks in the pipe or valve and can be used with any present indicators and PLC using analog output (4-20mA). SI-100D is a low-priced compact and light entry-level product. This device is very easy to install and has an Ex. proof (Ex d ⅡB T4) housing making it suitable to install in hazardous area.