Arena Service Manual
9.5 DISINFECT INFUSION MONITOR
The Disinfect Infusion Monitor (DIM) is designed to verify that
the desired level of chemical disinfectant is infused into the fluid
path and to alert the operator if infused disinfectant is not detected.
The DIM determines the presence of the disinfectant by measuring
the conductivity of the solution. Because formaldehyde is not
conductive, formaldehyde cannot be monitored by the DIM.
It also monitors the conductivity when a chemical disinfect cycle is
started to make sure there are no other chemicals in the flow path.
The Instrument will automatically start a prerinse cycle and
continue rinsing the Instrument with fresh RO water until the
conductivity is less than or equal to the Prerinse Conductivity
Threshold or the Prerinse Timeout has elapsed.
A qualified service technician can customize the Instrument to
enable or disable the DIM. It can also be customized for one
single pass disinfectant and one dwell disinfectant. Refer to
Section 17.3.2. for the DIM settings.
WARNING
Using sodium hypochlorite or Amuchina in Instruments
with On-Line Hemodiafiltration or dialysate filters will
damage the filters.
Note that single pass chemicals are not allowed on an Instrument
equipped with OLHDF or Dialysate Filters.
9.5.1 Prerinse for Chemical Disinfect
When chemical disinfectant is started, the Instrument rinses with
fresh water until the conductivity reaches 1.0 mS/cm displaying
“Chem Disinfect: Pre-Rinse” in the instruction window. After the
conductivity has reached 1.0 mS/cm, the Instrument continues to
rinse until the conductivity reaches the prerinse conductivity
threshold (by default 0.0 mS/cm) or the prerinse timeout (5
minutes).
If the conductivity of the rinse water is greater than zero, the
Disinfect Infusion Monitor can be disabled (see Section 17.3.2.8),
or the prerinse conductivity threshold can be raised to 0.1 or 0.2
mS/cm, but only by changing a calibration constant (see Section
5.4.7). The Instrument calculates the difference between the
conductivity reading at the time of the disinfectant infusion and the
conductivity reading when the Instrument last transitioned from
prerinse to infusion. If it is greater than or equal to the
9-22 157-1278-916, Rev A
March 2004
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