Features: Maximum operating temperature 900 , using the Fe-Cr-Al or Ni-Cr resistance wire as heating ... element. Features: Maximum operating temperature 900 °C, using the Fe-Cr-Al or Ni-Cr resistance wire as heating ... complete about 30-60 seconds,the infrared wavelength range 2-4 μ, the average life of 30,000 hours.There are three sizes, 8 ...