ASP sterrad NX, Руководство по обслуживанию и устранению неисправностей, Страница: 18 / 126

3
Functional Description
Hydrogen Peroxide Concentration
and Delivery
During the hydrogen peroxide delivery step, hydrogen peroxide solution
is delivered into the vaporizer bowl at atmospheric pressure conditions.
Air is removed from the chamber and from the vaporizer/condenser by
pulling a vacuum to a controlled pressure in the vaporizer/condenser. At
this time, the transfer valve is closed. Water is removed from the 59%
hydrogen peroxide solution by reducing the pressure in the condenser.
The pressure differential between the chamber and the condenser creates
the driving force to remove the water. During this concentration step, the
flow of water vapor is restricted by an orifice between the condenser and
the chamber, creating lower chamber pressure.
Once the controlled pressure is achieved in the condenser, the chamber
pressure is further reduced by closing the orifice with the transition
valve. The condenser temperature is increased and the concentrated
hydrogen peroxide vapor is then transferred into the chamber by opening
the transfer valve and the transition valve. This transfer step is followed
by the diffusion step (which occurs at atmospheric pressure), followed by
pressure reduction and plasma. The vent step then occurs which returns
the chamber to atmospheric pressure. This process occurs twice during a
complete sterilization cycle.
Process Monitoring and Control
The monitoring and control systems regulate the following:
♦
Temperature
♦
Pressure
♦
Hydrogen peroxide monitor
♦
Plasma power
♦
Time
♦
Process status
♦
IMS
18 STERRAD
®
NX
™
Service Guide