What is the working principle and components of the dry heat sterilization cabinet?

1. Working principle of dry heat sterilization cabinet

1. The heat sterilization box adopts dry heat sterilization method, which refers to the method of sterilization with high temperature dry hot air. This method is applicable to the sterilization of high-temperature-resistant glass and metal products, greases (such as oily ointment mechanism, injection oil, etc.) that do not allow the penetration of hot and humid gases, and high-temperature-resistant powder chemicals. It is suitable for high-temperature-resistant glassware, Porcelain, glassy syringes, etc. are not suitable for the sterilization of rubber, plastics and most drugs.

2. Under the condition of dry heat, due to poor heat penetration, the heat resistance of microorganisms is strong, and it must be subjected to high temperature for a long time to achieve the purpose of sterilization. Therefore, the temperature adopted by the dry hot air sterilization method is generally higher than that of the wet heat sterilization method. In order to ensure the sterilization effect, the general provisions are: sterilization at 135-140 degrees Celsius for 3-5 hours; sterilization at 160-170 degrees Celsius for 2-4 hours; sterilization at 180-200 degrees Celsius for 0.5-1 hours, which can kill all microorganisms including spores

2. Components

1. Buffer plate, air valve, air regulator or air baffle

Buffer plates or air baffles are used to control the air flow of the dry heat sterilization cabinet, and are mostly installed near the intake or exhaust air pipes or heaters.

2. Fan

Has a great influence on the air circulation in the dry heat sterilizer. The air volume of the fan should be measurable and adjustable. If necessary, the supplier can be required to add this requirement to its equipment standard. Because the measurement indication value of the fan air volume can provide a basis for checking the fan status during the use of the device.

3. Operation of chain control system

The interlocking control system in the dry heat sterilizer is equipped with: door interlocking control system; pressure sensor; temperature sensing, control, interlocking control device to stop the operation of the conveyor belt, etc., to ensure that in any case, the temperature is lower than the design requirements to prevent extinction The fungus items pass through the sterilizer below the sterilization temperature.

4. Temperature controller and recorder

The control system must ensure that the sterilization temperature in the sterilizer chamber can be kept within the set sterilization temperature range, and the recording system must accurately record the temperature detection and temperature readings of the sensor system.