Haemonetics MCS+, Operator And Maintenance Manual

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2-20 System Description
P/N 39551-00, Rev. F
During Draw, the presence of fluid in the blood line within the BLAD allows the
machine to account for blood pumped. This volume is displayed as “Volume
Processed” on the display screen during Draw and Return.
Donor Line Air
Detector 1
(DLAD 1)
The Donor Line Air Detector 1 (DLAD 1) monitors the donor/patient line. Detec-
tion of fluid by the DLAD 1 during Prime alerts the MCS+ device that priming is
complete.
The DLAD 1 also alerts the operator to any air introduced into the system during
the Draw mode. Anticoagulated whole blood flows through the DLAD 1. If air is
detected, the pumps are stopped, an audible signal is heard, and the display
screen alerts the operator with a message.
During Return, this component serves to detect air in the unlikely event that air
passes by the BLAD and the Donor Line Air Detector 2 (DLAD 2). If air is detect-
ed, the DLAD 1 stops the pumps, sounds an audible alarm, and displays a mes-
sage.
The DLAD 1 is monitored by the MCS+ device safety system. This provides an
extra level of safety in the unlikely event of a malfunction.
Warning! Any time an air detection alarm is heard, immedi-
ately attend to the machine and take appropriate action.
Warning! An air detection by the DLAD 1 during Return may
indicate a failure of the BLAD and/or DLAD 2. Carefully note
the source of air detected. Remove the air from the line, follow-
ing the procedures given in Chapter 5, Notice Messages and
Troubleshooting.
Donor Line Air
Detector 2
(DLAD 2)
The DLAD 2 is located on the front panel of the MCS+ device below the DLAD
1. This air detector serves as a backup to the BLAD. If, for any reason, air is not
detected by the BLAD and the filter chamber is emptied, the DLAD 2 stops the
pumps, closes the donor/patient valve, and causes a notice message to display
and an alarm to sound.
As an extra measure of precaution, this detector is also monitored by the safety
system, which directly stops the pumps upon air detection.