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VERFLO
TM
SERVICE & TECHNICAL INFORMATION 1039055, VER. 06
4.2 ELECTRICAL OPERATION
The EverFlo Concentrator is a medical device, which produces concentrated oxygen from room air for delivery to
a patient. It uses a molecular sieve and a pressure swing adsorption process to concentrate oxygen from air. The
device consists of filters, a compressor, a sieve canister module, a set of valves, a microprocessor-based
electronic controller PCA, a flow meter and a cooling fan – all contained within a plastic enclosure.
The EverFlo Embedded Software
—via the microprocessor contained on the PCA Controller—controls the sieve
valves used to generate the oxygen, measures/monitors the pressure & oxygen levels, drives the Elapsed Time
counter (Hour meter), reports exception conditions to the User via visual and audible indicators and provides
diagnostic information to a Host computer via an RS232 communications interface.
4.3 PCA CONTROLLER OVERVIEW
All the electric / electronic functions of the EverFlo Concentrator reside on the PCA Controller. A block diagram of
the PCA controller is provided in Figure A. The reader is urged to continually refer to this diagram when reading
the remaining sections of this document.
The PCA controller can be sub-divided into 2 major sections:
1.
Power distribution and DC voltage generation.
2.
Monitoring / Control / User Interface.
Figure 4-2: EverFlo PCA Controller Block Diagram
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