VHP Generator
The VHP generator is a kind of equipment applying technology that attacks cellular constituents (including lipid, protein and DNA) with the free –OH generated to meet the requirement of complete sterilization, by taking the advantage that vaporized hydrogen peroxide can kill spores more easily under normal temperature condition. It is commonly used to sterilize enclosed spaces, such as isolation rooms and isolators.
The biological decontamination process of the plasma VHP generator can be divided into four stages:
1. Vaporization stage: Input the hydrogen peroxide solution into the vaporizer and then input the vapor phase hydrogen peroxide formed into the mix tank for processing through the fan;
2. Hydrogen peroxide plasma generation stage: Introduce the vapor phase hydrogen peroxide to the plasma tank and send the plasma hydrogen peroxide formed to the sterilization tank;
3. Biological decontamination maintenance process: Continue to input plasma hydrogen peroxide to the sterilization tank until it reaches the preset concentration (subject to concentration value revealed by the biological test strip) and then start timing. Maintain the preset concentration for 30-35min before completion of biological decontamination and then stop the vapor phase and plasma hydrogen peroxide generation processes. It is verified that the sterilization efficiency can reach 6-log if keeping the preset concentration for 30min.
4. Residue removal stage: Switch the gas path system to the residue removal devices, convert the vaporized plasma hydrogen peroxide into water and oxygen and repeat this process continuously until the concentration of hydrogen peroxide is less than 1ppm.
The operation of each stage can be controlled manually or automatically and carried out in order.
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