An effluent sterilizer is piped in such a way as to hold all effluent produced during Purge, Pre-pulses, Charge, and Sterilization phases of a cycle within the chamber until the end of the Sterilization phase.

A PRIMUS effluent sterilizer has two chamber drains. There are two on top of the sterilizer called large vent and small vent used for the Purge, Pre-pulse, and Sterilize phases and a second one at the bottom of the sterilizer that is used for Exhaust and Dry phases of the cycle.

The two chamber vents located on the top of the sterilizer releases all steam and air through a 0.2 micron filter to ensure that pathogens are kept inside the chamber until the Sterilization phase is complete.

Steam is injected into the chamber through the bottom drain and vented through a large valve connected to the top vent during Purge. The small amount of steam required to sense chamber temperature during the Sterilization phase is taken from the small top vent through a manual bleed valve to enable the controlling RTD to sense the chamber temperature. The control system regulates both valves as needed.

Following the Sterilization phase, the effluent sterilizer opens the chamber drain located at the bottom of the chamber and performs the Exhaust and Dry phase.

The Air-In phase provides make-up air to the chamber back through the 0.2 micron filter and the cycle is complete.

Have a question or having difficulties? Talk to Dave Schall, our PRIMUS sterilizer expert who is here to assist you anytime at 877.679.7800 extension 1212 or email at

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