its set time and will itself automatically stop operating after timer 2 has completed its set time the air stream issuance time equals t 2 minus t 1 minus the time required for the temperature of heater 13 to rise to its operating temperature about 2 minutes because the predetermined time required for the device to reach the operating temperature of 100 u00b0 c for the heater 13 is a known factor i e certain 2 minutes a user can take this factor into account by a very simple calculation when setting the device for one of the modes of operation as described above a user can work the device on site or not on site to deodorize medicate or otherwise treat an area such as at his her room and or operate the device at random or in quantization the thermocouple operated switch s 4 controlled by thermocouple tc 1 switches off whenever the heater temperature reaches 200 u00b0 c in order to protect the device from overheating when the temperature of heater h 1 is over about set temperature about 200 degrees c of tc 1 switch s 4 switches off the current through heater h 1 r 2 high resistance and l 2 become smaller and so temperature of h 1 comes down vice versa when the temperature of heater h 1 comes down too much tc 1 senses such lower temperature and switch s 4 is turned on to increase current and temperature of heater h 1 switch s 4 is a safety mechanism both thermocouples tc 1 and tc 2 sense the temperature of heater 13 and are.