Equipment Description
37
Haemonetics
®
ACP-215
®
Service Manual
P/N: SM-ACP215-01-EN(AB)
magnetic field, the interlock signal is pulled to ground. Donor pressure interlock
1 and 2 and bowl pressure interlock 1 and 2 are pulled up by a resistor network,
then isolated through a second resistor network, buffered, and finally read into
the CPU via an I/O port.
Air Detectors
The device uses two ultrasonic air detectors that are located on the top deck of
the device. One is placed at the inlet of the solution pump, and the other at the
inlet of the blood pump. These air detectors monitor fluid flow and ensure the
correct operation of the procedure. In case of an occlusion in the tubing or an
interruption in the flow, the air detectors stop the pump and a message on the
display informs the operator of the condition.
Circuit Description
The air detect signals are independently monitored by the CPU card. The
signal is +5 VDC when the air detector senses fluid, and is pulled to ground
when sensing air.
The two air detector signals are pulled down by a resistor network, then
buffered, and read into the CPU by an I/O port. These signals are also latched
on board and read by a second I/O port.
Two one-second timers will be started whenever air is present. If time-out
occurs, the corresponding faults will be presented to the fault registers and the
procedure will be aborted by opening the relays.
