14
98-0157 Rev K
4.
OPERATIONAL OVERVIEW
The MediQA is available as a single pass or dual pass reverse osmosis (RO) unit to be
used for purification of potable water for renal dialysis applications.
Potable water enters the MediQA through an inlet solenoid valve filling the feed water
tank. A high pressure pump delivers water from the feed water tank through the 1st
stage RO module set (may comprise of one or more modules), with each module
containing a high performance membrane.
The water entering the RO module is split into two flows. The water which passes
through the RO module (membrane) is known as permeate and is purified water. The
rest of the water, rejected by the membrane, passes out of the RO module as a second
flow stream. The rejected water contains an increased level of dissolved salts and is
known as concentrate. A portion of the concentrate will be recovered and directed back
into the tank for re-processing.
In the single pass system, Hi Recovery Mode allows a higher percentage of reject water
to be recovered. The default target recovery percentage is 65%.
In the dual pass system, process water (permeate) from the 1st stage is pressurized by
a second high pressure pump and fed to the second stage RO module set (may
comprise of one or more RO modules).
In the dual pass (two RO stages) MediQA, a portion of the concentrate (reject water)
from the 1st stage RO module set is discharged to drain while the balance is returned
to the tank. Concentrate from the 2nd stage RO module set is returned to the feed
water tank for reprocessing.
Permeate from the 2nd stage RO module set is fed via a manifold to the distribution
loop. Permeate returning from the loop is fed back into the feed tank.
The feed and permeate water flows are monitored at various points in the process to
verify temperature, conductivity, and flow.
This data is displayed on a touch screen panel to give instant feedback of water quality
and process activity.
4.1
MEDIQA BASIC OPERATION
When TIMER or CONTINUOUS is activated by touch buttons on the touch screen display
the MediQA initially performs an
AutoFlush followed by an AutoRinse routine, once
completed purified water will be available (supplied through connection pipe work) to
the distribution loop or attached medical device. This feature of the system prevents
Summary of Contents for MediQA MDP Series
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