American diffusion-proof barrier layer has been applied to our each TE modules. This technique is different from the thermal bismuth hitching technique. It promotes both the rel iability and unity of the TE modules During reliability test in our factory, resistance value maintains almost the same after 24-hour ＋18s. and -6s. electrify. At the same time electricity lasting quality and non-corrosibility of TE module is greatly advanced. Life expanse may reach more than five years， if it is installed and assembled properly.

Correct methods of installation and assembly:
1.Fix heat sink to one side of TE module, and cooling system to the other side. Flatness must be less than 0.03mm and sewage and burr must be cleared off.
2.Connect TE module heat, sink and cooling system properly. with a thin layer of heat conductive silicagrease.
3.Keep TE module under even and acceptable pressure to avoid damage. Correct operating conditions:
1．Use DC voltage in the range of rated voltage,ripple factor<10％.
2．Keep loading current in the range of rated current.
3．Don't electrify instantly or reversally while the TE module is in operation(restart only 5 minutes later.)
4．Don't get water into the TE module.
5．Keep humidity less than 80％ around the TE module.