Vacuum atmosphere box furnaces are a very common type of laboratory equipment, widely used in material heat treatment, heating of test specimens, oxygen-free processing, and various other applications. This article will describe the operating procedures for multi-station vacuum atmosphere tube furnaces.

　　Let us now examine the basic structure of a multi-station vacuum-atmosphere tube furnace. It consists of an electric heating furnace body, a vacuum system, an atmosphere control system, and a temperature control system. The electric heating furnace body is typically fabricated from high-temperature alloy materials, enabling it to withstand the operating conditions associated with high-temperature environments. The vacuum system is used to evacuate the furnace chamber to a vacuum state, thereby facilitating oxygen-free processing. The atmosphere control system is responsible for introducing a specific process atmosphere—such as nitrogen or hydrogen—into the furnace chamber. Meanwhile, the temperature control system ensures stable and precise regulation of the furnace temperature.

　　Before operating a multi-station vacuum-atmosphere tube furnace, it is essential to first inspect the operational status of the furnace body and its associated systems. Verify that the electric heating elements, vacuum pump, pressure gauge, gas cylinders, and other equipment are functioning properly, and ensure that the furnace chamber is free of any impurities or contaminants.

　　Next, the furnace chamber is prepared according to the experimental requirements. If vacuum treatment is required, the vacuum system switch must be turned on and the vacuum pump started to evacuate the chamber to a specified vacuum level. During the evacuation process, the operating status of the vacuum pump and the readings on the pressure gauge should be monitored, and any malfunctions should be promptly addressed.

　　Once the furnace chamber has reached the desired vacuum level, the vacuum pump can be shut down, and the appropriate process gas can be introduced for atmosphere control as required. Turn on the atmosphere control system and introduce the selected gas into the furnace chamber. During gas introduction, continuously monitor the pressure gauge and flow meter of the atmosphere control system to ensure stable atmospheric conditions and proper gas flow.

　　After completing the atmosphere treatment, temperature control can be initiated. According to the experimental requirements, set the desired temperature in the temperature control system and turn on the heating switch. The temperature control system will automatically regulate the furnace temperature based on the setpoint and the actual temperature, thereby maintaining thermal stability within the furnace.

　　Throughout the entire experiment, it is essential to closely monitor changes in furnace temperature, atmosphere conditions, and relevant indicators, and to make timely adjustments to the corresponding parameters. Upon completion of the experiment, the heating switch and atmosphere control system should be turned off, and the furnace door should not be opened until the furnace chamber has cooled to a safe temperature.

　　When operating a multi-station vacuum-atmosphere tube furnace, the following points must be observed:

　　Never exceed the electric furnace’s maximum temperature or operating parameter limits to prevent equipment damage and safety incidents.

　　During vacuum processing and atmosphere control, it is essential to ensure the tight sealing of the relevant systems to prevent gas leaks or permeation that could compromise the experimental results.

　　During operation, regularly inspect the operating status of all systems and address any abnormalities promptly.

　　When cleaning and maintaining the electric furnace, disconnect the power supply and allow the furnace to cool to a safe temperature.

　　In summary, the multi-station vacuum-atmosphere tube furnace is a highly practical piece of laboratory equipment. Proper operation and maintenance can provide favorable experimental conditions and accurate results for research activities. It is hoped that the present article will help readers better understand and effectively use this instrument.