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10.15-1
10.15. Adjustment of bubble sensor
10.15.1. SBY0160 board
Adjust bubble sensor by setting water filled blood line to bubble detector followed by turning volume
of bubble sensor board based on the following procedures.
(1) Required devices
Blood line
Tester
Precision screwdriver
Micro-syringe
(2) Remove left cover from upper part of machine to expose bubble sensor board as SBY0160.
(3) Set tester to DC range and connect test PIN602 of bubble sensor board to (+) probe of the
tester and PIN601 of the board to (-) probe of it.
(4) Set standard tube filled with about 37 water to bubble detector and adjust voltage indication
of the tester to the maximum by turning VR601.
(5) Check that the adjusted voltage is 1.6 to 1.8V.
(6) Remove the tube from the detector and check that the voltage indication is reduced to 0.5V.
(7) Set blood line to blood pump.
(8) Operate the pump at a flow rate of 200mL/min to re-circulate 37 water through the line.
(9) Turn on BUBBLE DETECTOR SW and introduce 0.05ml of bubble into the line using
micro-syringe under care for the bubble is not divided. Check that bubble alarm is actuated
when the bubble passes through the detector sensor.
(10) Return the removed cover to the original position.
VR601
CN601
PIN601(GND)
CN602
PIN602(TP)
SBY0160
Fig. 10.15-1 Bubble sensor board (SBY0160)
Adjust value Adjust point Test point
With blood line 1.6 - 1.8V VR601
Without blood lint Less than 0.5V
PIN602 PIN601