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GEE Ethylene Oxide (EO) Sterilizers

Safe and efficient low temperature sterilization

EO sterilization is used on heat/moisture sensitive products. The sterilization process allows the product to remain packed and palletized for the entire process, and is ready to ship without the need for additional re-packing or handling.

GEE Ethylene Oxide sterilizer with a man working next to it

Efficient sterilization in production of heat sensitive goods

  • Safe, reliable, and repeatable results
  • Protect the integrity of products and packaging
  • Faster sterilization process

Process control

Control system

The GEE Ethylene Oxide Sterilizers are equipped with a PLC automation (Allen Bradley or Siemens) system and is usually connected to a central supervisory control and data acquisition (SCADA) system for overall process monitoring and control. The system provides audible and visual notification in event of deviation from the operating parameters. The PLC can be configured for specific process requirements allowing for optimization of your processes while protecting the product packaging by controlled pressure ramping. Data storage, format and monitoring are fully flexible to support specific process needs.


The HMI interface is built on a full SCADA system that is 21CFRPart11 compliant. The system includes multiple screens for process viewing and system operations. Built-in traceability functions ensure all processes, machines, and pallets are registered and documented throughout the process.

Batch reporting features include both detailed and summarized reports as well as auto batch release functions.


Businesswoman and engineer discussing

Safe production processes

The safety of your staff is of paramount importance.

The GEE Ethylene Oxide Sterilizers are built for full compliance with ATEX regulations and all designs are subject to risk and failure analysis techniques (HAZOP, FMEA).

Our systems include redundant safety features to give you peace of mind over your process.

Control of the EO

A built-in automatic chamber leak rate test also tests the integrity of the EO supply line from the gas room to the chamber as part of every cycle. The EO is vaporized by gas dispensing equipment located outside the building, which prevents liquid EO from entering the facility. The dual door gasket assures that EO cannot leak out of the chamber when in positive pressure, and that air cannot leak into the chamber when in negative pressure.

Process safety through PLC and SCADA

The PLC activates alarms when the process is outside normal operating parameters and reacts accordingly with appropriate steps. With the SCADA operator control station option, sophisticated software calculates if the cycle will operate within the flammability curve and automatically informs the operator if the programmed cycle has a flammable mix. It can also be set-up to inhibit cycle start, if required.

Leak-tight door design

When closed, the door is sealed using a dual gasket system that will remain leak tight even if all services fail. The door is automatically sealed by pushing the two door seals against the door face using pressurized nitrogen. A pressure switch monitors the pressure behind the seal. In the event of a loss of nitrogen, a high-pressure tank will back up the door seal until the sterilizer can complete a process to safe cycle end.

Load handling

Getinge’s automatic pallet transfer system

Safe and efficient load handling

Getinge’s automatic pallet transfer system (APTS) is a safe pallet lift and movement system that can transfer single or multiple pallets in two linear directions for automatic loading of the products.

Pallets are accurately positioned within the chamber to maximize throughput and efficacy. The system has no moving parts within the sterilizer chamber and requires no operator entry into the EO chamber, making it a safe solution.

Movements using pneumatic motors and components allow for system operation in ATEX-classified environments.

Process outline

The EO sterilization process consists of three stages. These stages can be performed within the sterilizer chamber or in three separate chambers.


In the pre-treatment stage the load is heated and humidified to prepare for sterilization.

EO sterilization

The load is sterilized with the correct concentration of EO gas at low temperatures.


In the post-conditioning stage, the gas is removed from the product and packaging for safe downstream handling.

Temperature control

To ensure rapid heating and a consistent load temperature, heated water is circulated through the jacket and doors. If required, a cooling system can also be included for rapid transition to lower temperatures.

Chamber recirculation

The chamber recirculation system is essential to ensure uniform gas and temperature distribution. The external distribution piping is heated to maintain temperature and minimize losses.

Vacuum system

GEE EO Sterilizers are equipped with liquid ring vacuum pumps providing efficient air removal of sterilizer chamber and internal load. The vacuum system removes high concentrations of EO from the chamber in a short period of time.

Gas dispensing

EO is usually supplied as liquid in pressurized containers. Vaporization ensures that liquid EO does not enter the sterilization area. The heating medium can be either steam or hot water for accurate temperature control and flow regulation.