Arena Service Manual
9.3 HEAT DISINFECTION
9.3.1 Heat Clean
Weekly chemical disinfection is recommended as a supplement to
daily heat disinfection.
NOTE
Make sure that there is an adequate air gap between the end of the
drain line and the liquid level in the drain, and that the drain is
vented.
Heat disinfection is an effective and accepted method of
disinfection against most water-borne bacteria typically found in
water supply systems and hemodialysis equipment (see Section
9.6). If bacterial contamination is from heat-resistant organisms,
such as Bacillus varieties which are spore-forming bacteria, then
heat disinfection may be insufficient to prevent overgrowth and
formation of a biological film. In these cases of contamination,
heat-cleaning may need to be supplemented with chemical
disinfection on a weekly or as-required basis.
NOTE
It is the clinic’s responsibility to culture frequently and identify the
organisms so that the best means and schedule of disinfection may
be prescribed.
The Instrument will automatically heat the water to above 85 °C
and circulate the heated water through the system for a period of
time set by the technician (see Section 17.3.2.2). One of two types
of heat disinfection cycles may be chosen:
• Heat disinfection with automatic cool down
• Heat disinfection with automatic soft power off.
In order to start a heat disinfection cycle, the Instrument must be in
the Rinse Mode and the dialyzer connectors must be on the rinse
block.
•
•
If the conductivity is above 3.2 mS/cm when the heat
disinfection cycle is started, the fluid path will be rinsed until
the conductivity reaches 1.0 mS/cm, then a timed rinse of 5
minutes (or until conductivity is 0 mS/cm, whichever occurs
first) is performed before recirculation begins.
If the conductivity is between 3.2 mS/cm and 0.1 mS/cm, then
a timed rinse of approximately 4 minutes is automatically
performed before recirculation begins.
9-6 157-1278-916, Rev A
March 2004
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