16. Preventive Maintenance
16.5 PARTICLE FILTER REPLACEMENT
16.5.1 Overview
The service life of the particle filters depends on the rate at which
material collects on the filter screens, increasing the filter pressure
drop. Ultimately the performance of the Instrument may be
affected.
If filter clogging is due to precipitation of dialysate in the fluid
path, the filters must be replaced as part of the fluid path cleaning
process.
Signs and symptoms of clogged filters:
If the clogging is caused by gradual buildup of particles on the
filter screens, the first symptoms will be increasing occurrence of
FLOW RESTRICTED alarm messages. Initially these will only be
seen at maximum dialysate flow rates, and as the clogging
progresses, will be observed at progressively lower flows.
Clogging is not likely to be detected by self-test unless the test is
performed at high flow rates.
CAUTION
If clogging is the result of massive precipitate formation in the
fluid path (such as might be caused by improper concentrate
selection or preparation errors), particle filter backpressure
will increase as well. In these cases, acid rinses or heat clean
cycles will not entirely remove the precipitates in the filters.
The filters must be replaced.
WARNING
Cleaning and reuse of the particle filter is not
recommended.
16.5.2 Particle Filters
Supplies needed
• Particle filter, J400100, 2 each
CAUTION
To prevent possible hydraulic line blow off, use a hose clamp to
secure the hydraulic lines to each side of the particle filters.
157-1278-923 Rev A 16-9
February 2004
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