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The Working Principle of Ethylene Oxide Sterilizer
2021-07-16 14:27
Ethylene oxide sterilizer is used to sterilize heat and humidity sensitive items, which is the best choice for sterilization of surgical precision medical instruments, optical instruments, electronic equipment, plastic products etc., to ensure the safety of operators. It has the characteristics of convenient transportation and storage, no need for huge gas cylinders, no need to filter gas, no CFC, environmentally friendly and safety.
Ethylene oxide sterilizer is a special equipment that uses ethylene oxide gas to sterilize items closed in the sterilization chamber at a certain temperature, pressure, and humidity. Ethylene oxide does not damage the sterilized items and has strong penetrating power. Therefore, most items that are not suitable for sterilization by general methods can be disinfected and sterilized with ethylene oxide, such as electronic equipment, optical instruments, medical devices, books, documents, fur, cotton, chemical fiber, plastic products, wood products, ceramics and metal products, endoscopes, dialyzers, and disposable medical supplies etc.. Ethylene oxide is currently one of the most important low-temperature sterilization methods.
Ethylene oxide sterilizer is generally composed of a sterilization box, an auxiliary rack (cabinet), an electrical control cabinet and a computer. Specifically, it can be divided into sterilization chamber, vacuum system, thermal cycle system, dosing system, door and sealing system, residual gas treatment system, electrical control system, and computer detection and management system. The working principle of the ethylene oxide sterilizer is as follows.
The sterilization effect of ethylene oxide is related to the temperature, pressure, humidity and concentration of ethylene oxide in the sterilization chamber. Controlling these parameters at appropriate values can shorten the sterilization time and achieve the best sterilization effect. Therefore, the process of the sterilizer operation first heats the sterilization chamber until the temperature reaches the sterilization temperature. Then, the sterilization chamber is vacuumed, and when the vacuum reaches the value required by the pre-vacuum, start to humidify the sterilization chamber and add medicine to it.
After the above process is completed, enter time-keeping operation and start the sterilization process. It requires a constant temperature throughout the sterilization process. When time is up, the sterilization chamber will be ventilated, that is, the filtered clean air will be used to replace the residual air in the sterilization chamber. After several repetitions, the residual air is drained. The residual gas is discharged through the  discarding treatment system. At this moment, the entire process is complete.

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