1.Sensors use imported sensitive elements, which have the characteristics of high accuracy, strong interchangeability and high reliability; 2.The internal machine core is in the form of components. Maintenance can be accomplished only by replacing components; 3.The shell of the detector is made of die-cast aluminum and the double-chamber structure, which is designed to avoid failure because of accidental water intake, dust intake and corrosion. It is small in size and easy to install. 4.Independent acousto-optic alarm, when the gas concentration exceeds the stardard, it will send out acousto-optic alarm on the spot., Manufacturer: LLAWQSM