HUMIDIFYING DEVICE

PURPOSE:To continuously achieve function and to prevent wasteful consumption of power, by providing an alarming means which demands user to feed water by clearly displaying a dry-burning state. CONSTITUTION:When a humidifying state continue to lower a water level in a feed water tank 1 the temperature of a vaporizing cylinder 2 increases with lowering of the water level. When some temperature is reached a temperature over-increase preventing device 5 is turned OFF, and a display lamp 12 is connected in series to a heater 3 together with a high resistor 11 to light ON a display lamp 6. Simultaneously, the applying voltage of the heater 3 having a low resistance load is reduced to a very low value to hardly generate heat, and thereby the temperature of the vaporizing cylinder 2 is decreased. When temperature is decreased to the ON point of the temperature over-increase preventing device 5, the display lamp 12 is short-circuited again, a total voltage is applied on the heater 3 to generate heat. When a water level is low or a tank is empty, temperature increases to the OFF point of the temperature over- increases preventing device 5 in an extreme short time to light ON the display lamp 12 again. As noted above, the display lamp 12 is lighted ON to clearly inform a user of a dry-burning state.