9. Disinfection
This Cool Down Mode requires 6 to 8 minutes at a flow rate of
800 mL/min.
9.3.3 Auto Off (Automatic Soft Power Off)
When the Heat Clean time is complete, the Instrument enters Soft
Power Off Mode. Cool down is not used. The fan will remain on
until the primary temperature is out of alarm limits.
9.3.4 Heat Clean with Citric Acid
Citric Acid may be infused into the flowpath during Heat Clean to
enhance the disinfection and as a cleaner for bicarbonate
precipitate. See Section 17.3.5 for initial setup of Citric Acid Heat
Clean parameters. Additional hardware is required for automated
Citric Acid Heat Clean (see Section 2.4.4). The automated Citric
Acid Heat Clean option is not available in all markets.
9.3.4.1 Citric Acid Solution Preparation and Infusion
WARNING
Be careful when handling citric acid solutions. Read
and follow the instructions for the safe handling of citric
acid on the warning label on the citric acid bottle and
follow your center's guidelines for use.
The concentration of a solution is sometimes described as a
percentage in grams of a solute ion in a liter of solution. It may
also be described as the number of grams of the solute per liter of
solution (g/L).
A 10% solution will contain 100 grams of citric acid per one liter
of solution (100 g/L). This solution may be prepared easily using
food-grade citric acid (anhydrous) by dissolving the citric acid in
purified water. For example, in order to prepare one liter of 20%
citric acid solution, 200 grams of citric acid powder would be
dissolved in purified water to produce a total volume of one liter.
Do not directly add the citric acid to one liter of water, otherwise
the resulting citric acid concentration will be less than expected
because the final volume will be greater than one liter.
The volume of citric acid to be infused into the Instrument,
depends on the desired concentration in the fluid path. Table 9-1
summarizes the infusion volumes (milliliters) expected for
different concentrations of citric acid. The infusion rate of the acid
pump is approximately 40 mL/min.
To calculate the infusion time, divide the infusion volume by 40
mL/min (the acid pump speed). The result will be the infusion
157-1278-916, Rev A 9-9
March 2004
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