Mindray BC-2800 - Mixing Module; Pressure;Vacuum Module

Fluidic System
1
2
Negative pressure
chamber
Pump
Waste exit
NC
NO
C
NC
NO
C
Pressure
sensor
Probe Wipe
1
2
Negative pressure
chamber
Pump
Waste exit
NC
NO
C
NC
NO
C
Pressure
sensor
Probe Wipe
Figure2-7 Pressure/vacuum module
（the left establishes the pressure; the right establishes the vacuum）
2.4.5 Mixing module
The types of mixing is available: mixing by the horizontal movement of the
sample probe and bubble mixing. As Figure2-8 shows, the aspirated sample
needs to be diluted before the counting. Once the sample is dispensed into the
bath containing certain amount of dilute, the system will inform the mixing
module to work. Then the sample probe initiates a mild horizontal movement
inside the bath and the positive pressure is established inside the pressure
chamber. The valve is then open briefly and separate the air in the pressure
chamber into several air segments and expel them into the bath to introduces
bubbles. The bubbles pop up from the bottom of the bath and the mixing is done
thus.
The on/off interval of the valve is critical to effect of the bubble mixing. Either too
many or too few bubbles will affect the mixing. During the mixing process, the
airway should be well drained, or the trapped liquid will affect the quantity of the
bubbles as well as the dilution.
2-10 BC-2800 Auto Hematology Analyzer (V1.0)