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Vaporized Hydrogen Peroxide Gas Plasma Sterilization technology sterilizes surfaces and equipment, eliminating harmful pathogens. Injecting hydrogen peroxide vapor into the chamber and then by applying an electric field (via radio frequency), or microwave energy, excites the hydrogen peroxide molecules into a low-temperature plasma state. These sterilizers are an essential part of medical and pharmaceutical settings. They provide a powerful and effective way to sterilize surfaces and equipment, eliminating harmful pathogens. However, to ensure that the sterilization process is successful, it is crucial to have quality products that can sense, monitor, and control the variables involved in the process.

Deep vacuum pressure, the flow of vapor, cycle time, and chamber temperature can all impact the effectiveness of the sterilization process, and it is essential to monitor them closely to ensure that the process is successful. Sterilizers can even use a complete control system with a hydrogen peroxide monitor that measures the chamber sterilant concentration.

Cycle Time

A complete sterilization cycle using H2O2 (hydrogen peroxide) gas plasma can be as short as 25 minutes and up to several hours depending on the type of equipment being used and the characteristics of the load (objects) being sterilized. The different phases within a complete sterilization cycle (pre-heat, vacuum, injection, diffusion, plasma, vent) are also controlled and monitored for programmed periods of time and sometimes include multiple sub-cycles of these phases.

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Pressure

Pressure is typically ≤ 1 Torr for the vacuum phase(s). Vacuum level increases in the low Torr range, usually from 1-3 Torr during H2O2 injection phases. The diffusion stage (or exposure phase), when vaporized H2O2 comes into full surface contact with the objects, involves ramping up pressure to atmospheric level and then applying a vacuum to the chamber until levels again reach ≤ 1 Torr. That vacuum pressure is what causes the H2O2 to change to a plasma state, and it remains there during the plasma phase until pressure is increased or the chamber is vented back to atmospheric pressure.

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Temperature

Temperature is ramped to about 40-55°C to preheat the chamber. Although it is significantly higher than ambient, this is still considered “low-temperature sterilization” because other methods often require much higher temps (e.g. autoclaves). This temperature is held for the duration of the sterilization cycle, and maintaining precise setpoint accuracy is crucial.

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Flow Control (Valves)

The flow of hydrogen peroxide vapor from the H2O2 cartridge is injected into the chamber for a predetermined period. Any more or any less would render the sterilization ineffective, so accuracy and fast response time are important. Directional and on/off (flow/no-flow) control is necessary, and other factors such as chemical compatibility and life cycle ratings must be considered.

Products: Gems Solenoid Valves

Gems Sensors and Setra’s products have been field-tested around the world. Our sensors are highly accurate and repeatable, providing real-time data that can be used to adjust the process as needed. Our controllers are designed to provide precise control over the variables involved in all phases of the sterilization cycle. Our monitoring systems are highly configurable, providing data that can be used to optimize the gas plasma sterilization process. Partner with us for product solutions in your gas plasma sterilization application today.