Service manual

Section - VI Reading Station BT3000 PLUS Rev. 0, Soft Ver. 8 Page 6 of 12
4) TUBING & CONNECTORS: Most of the in/out fluid tubing has "quick-
connect" connectors that incorporate shut-off valves to facilitate the
removal of the reading station without liquid spills.
5) WATER RESERVOIR: A water reservoir of 55ml capacity has a
transparent porthole and an internal liquid level sensor, which emits
yellow light when the fluid reaches the maximum level. The membrane
pump located on the rear of the reading station PVC panel refills the
reservoir. The washing water from the external water supply tank is
aspirated through a transparent tube connected to the rear right side of
the analyzer.
A filter attached to the transparent tube in the water supply tank and an
additional filter on the intake of membrane pump removes undesired
corpuscles. In case of liquid level sensor malfunction an emergency
overflow tube connected on top of the water reservoir discharges liquid
into appropriate container outside the analyzer. The liquid level sensor
cable is connected to the Master Power Board (15-04209-01), where the
microcontroller (µC 552) monitors the pump through the feedback control
with the sensor.
6) PERISTALTIC PUMP: The peristaltic pump is dedicated to supplying the
washing water from the water reservoir to the fluidic circuit, which consists
of diluter, pinch-valves, sampling tube and the sampling needle. During
the washing cycle, the pump dispenses a necessary quantity of water,
which flows through diluter, sample tube, sampling needle, and then
finally ends up in the funnel for discharging.