4. Hydraulic Theory
Figure 4-9. Optical Sensor Assembly
The diaphragm has four flaps that will open under a pressure of 0.5
PSI, allowing the light from the LED to go across the assembly
and reach the Detector (see Figure 4-10). This will indicate that
dialysate is flowing. When the flow stops, the diaphragm will
close, blocking the light from the LED, which indicates that the
flow stopped.
A green LED on the Detector PCB will turn on when the Detector
does not get any light.
157-1278-893 4-13
January 2004
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