Product with different sensor type has the same structure for the sensing head.It is made of stainless steel and comprises two parts,cylindrical jointed and fastened with a threaded nut.For LEL/NDIR type,the sensing end has an 80um sinter fused into the enclosure to allow gas penetration to be detected by the internal equipment,the mounting end contains a setting compound through which the equipment wiring passes.For EC type,additional safety barrier board is located in the sensor head and encapsulated.The sensor PCB and replaceable gas sensor are located behind a removable chromium plated sensor cover.