Arena Service Manual
Figure 8-11. Output Pressure Equalizer
This pressure equalizer is also a chamber divided by a flexible
diaphragm. At the center and on each side of the diaphragm are
two actuators. When the pressure on one side of the diaphragm is
greater in relation to the other side, it causes the diaphragm’s
actuator to close the opening on the side at the lower pressure.
With its outlet blocked, incoming fluid increases the pressure until
it equals the pressure on the other side of the diaphragm. This
forces the actuator to open and normal flow to resume.
If pressure differences were allowed to persist, the flow equalizer
cavities would empty at a rate determined by the pressure
differences on either side of the flow equalizer. These relative
pressure differences could cause uneven filling and make
regulation of the flow rate through the dialyzer difficult. By
forcing the pressures to equilibrate, the pressure equalizer ensures
the flow equalizer chambers empty at an even rate.
8.3.7 Flow Restrictor ("Post" Blood Leak Detector)
A flow restriction on the output of the Blood Leak Detector
ensures that there is always positive pressure on the "post" side of
the output pressure equalizer.
8.3.8 Dialyzer Connectors and Dialyzer
The dialyzer connectors are used to insert the dialyzer into the UF
system. The Instrument can detect if the connectors are connected
or are removed from the rinse block. The connectors should be
8-14 157-1278-915 Rev A
January 2004
To Next Page
Loading...
