I. Overview Features: easy and reliable installation. Uses: Second life except the life of the heating tube and the resistance wire quality related, but also the quality and magnesium powder, selection resistance wire diameter metal mold or machine parts factors. Manufacture of electric heating surface load, there are strict expectations. When selecting the diameter of the resistance wire, resistance wire surface load to be calculated to achieve life requirements. Third, the use of environmental conditions a. Altitude less than 1000m b. Ambient temperature -20 ~ 50 ℃ c. Ambient air relative humidity less than 90% (the ambient temperature is 25 ℃) d. Surrounding non-conductive dust, explosive gas and can seriously damage the metal and insulation corrosive gases e. No obvious shock and vibration