The weight of the trigger gun (including the arc light source) is only 1.3kg, making the operator less prone to fatigue. A handheld computer is installed on the trigger gun, with an angle suitable for reading data. The sample number and other information can be input into the instrument through the touch screen. The excitation gun and the instrument host are connected by a cable, with a weight of 4.5kg. The host includes an optical system, a readout system, a power supply system, a purification system for carbon element analysis, and a rechargeable battery. The instrument is placed in a backpack with shoulder protection, which can be conveniently and comfortably carried on the shoulder.