... certain period of time to kill residual microorganisms. Characteristics 1.Automatic cut-off ,time is running,calls the restoration,parameter memory ... temperature,regular time clearly,each parameter display can be facultative switch. 9.Set the time from 1 to 9999 minutes ... Stand-off to prevent,and stand-alone over -temperature protection,and sensor fault alarm,over-temperture alarm limit 11.Duct design ...