Service manual

Section - VI Reading Station BT3000 PLUS Rev. 0, Soft Ver. 8 Page 5 of 12
6-4. DILUTER AND WASHER MODULE
The upper part of the reading station consists of a PVC panel (Figure 6-4.), which
accommodates the following devices:
1) DILUTER: A 470 µl (Full Scale) diluter pump providing the analyzer with
high precision, reproducibility, and reliability. The stepper motor and the
photo-sensor cable is connected to the Master Power Board (15-04209-
01) on the rear of the PVC panel.
2) PINCH VALVE: A pinch valve, peristaltic pump and sample needle, which
complete the sampling system as described in detail in Section VIII
entitled, "Sampling Station". The cuvette washer module positioned in a
similar manner to the previous version used on BT 2000/3000.
3) WASHER MODULE: The washer module utilizes a bi-directional, linear
actuator-based stepper drive mechanism to provide the washing piston
carriage rapid linear movement in up/down directions. The piston has a
central bore, three equal openings on the external hemisphere, and a
tapered body for improved cleaning, emptying, and drying of the cuvettes.
A photo-switch is provided for reset and standby position. The actuator
stepper motor and the photo-switch cable connects to the Master Power
Board (15-04209-01) located to the rear of the PVC panel. These are all
managed by the microcontroller µC764.
DILUTER/WASHER MODULE
Figure 6-4
DILUTER PUMP
WASHER
PERISTALTIC PUMP LINEAR ACTUATOR
LIQ. LEVEL SENSOR
WATER RESERVOIR
WASHING PISTON
WASHER PINCH
VALVE
DILUTER PINCH
VALVE
READING
STATION PVC
PANEL