A digital dual-loop temperature controller enables the operator to independently set the chamber temperature and the temperature of the bubble tower. The chamber is heated by a wrap-around heater jacket which is bonded to the exterior surface of the internal workspace to protect it from damage from the corrosive climate created inside the test chamber. The bubble tower humidifies the compressed air on the way to the salt fog atomizer and is heated by an immersion heater. Both the cabinet and bubble tower are equipped with over-temperature protection safety thermostats.
The water level in the bubble tower can be filled with de ionized water in one of two ways-either automatically, if the chamber is connected to a pressurized water supply, or by hand, using the manual filler port which is standard on both NaCl models.
A separate external salt solution reservoir, where the salt water to be atomized into a fog is mixed and held, is provided with both NaCl models. The utilization of a separate external salt solution reservoir facilitates quick change-overs when going from an ASTM standard to a DIN standard.
Salt fog fall-out is controlled by an adjustable flow control meter located on the control panel. This, coupled with the integrated air pressure regulator and gauge, is used to ensure a uniform and continuous fall-out of salt fog onto the samples under test.