Arena Service Manual
Supply Pressure Regulator
Input Pressure Equalizer
Flow Equalizer
Output Pressure Equalizer
Dialyzer Connectors and Dialyzer
Check Valve
Dialysate Pressure Pump
Flow Restrictor
UF Removal Regulator
UF Flow Meter
Refer to Section 8, Ultrafiltration Control, for more information on
the UF System.
4.4 BLOOD LEAK DETECTOR
Spent dialysate expelled from the flow equalizer passes through
and is monitored for the presence of blood in the blood leak
detector. There is a light source and a photocell which monitors
the light transmitted through the solution present in the cavity. If
blood leaks through the dialyzer membrane, the blood passing
through the blood leak detector will absorb a portion of the light,
preventing it from reaching the photocell. The dimmed light then
sets off a blood leak alarm and protects the patient by stopping the
blood pump, clamping the venous line, and warning the operator.
For more information, refer to Section 14, Blood Leak Detector.
4.5 OTHER COMPONENTS
4.5.1 Rinse Valve
The rinse valve (also called the dialysate pressure relief valve)
connects to the fluid path immediately after the flow sensor on the
downstream side of the dialyzer. When the Instrument is in the
Rinse Mode, the electronics control the UF flow meter to meter 3.6
L/h of fluid out of the flow path. Fluid must be added to the
system to prevent a vacuum from being built up in the flow path.
The rinse valve allows fluid from the drain line to replace the
volume removed by the UF flow meter.
4-18 157-1278-893 Rev A
January 2004
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