9-36
CELL-DYN
®
3200 System Operator’s Manual
9140181H—October 2001
Service and Maintenance
Nonscheduled Maintenance Procedures
Section 9
Unclogging the Open Sample Aspiration Probe
If a blockage is suspected, it may be cleared using the procedure described above
in
Open Sample Probe Interior Cleaning
.
Closed Sample Needle Interior Cleaning
The Aspiration Needle in the Tower Module should be cleaned regularly to remove
protein buildup or debris and reduce the possibility of a blockage. In addition to the
Aspiration Needle Cleaning
in
Daily Maintenance Procedures,
use the steps
described below for cleaning the needle in the Tower Module.
Materials Required
1. Gloves, lab coat, and safety glasses
2. Syringe (10 cc or larger) with at least 3" of 1/32" (internal diameter) silicone
tubing attached to the tip
3. Small needle-nose pliers or similar tool
4. Beaker or container
5. Deionized water
6. Cleaning solution (0.5% sodium hypochlorite solution). See the formula for
mixing this solution under
Decontamination Procedures
earlier in this
section.
Procedure
WARNING: Potential Biohazard.
The sample needle is sharp and
potentially contaminated with infectious material. Avoid contact with the
tip of the needle.
1. In the
MAIN MENU
, press
[SPECIAL PROTOCOLS]
IROORZHGE\
>
DIS/ENAB
ANALYZER
@DQG
[DISABLE ANALYZER]
.
2. Pull the tower cover up and off the instrument. (Tower Door on the CS model
must be open).
3. Locate the Aspiration Tubing and Vent Tubing attached to the top of the
Closed Sample Aspiration Needle. (Refer to Figure 9.12.)
NOTE:
The Aspiration Needle consists of two separate needles joined
together, one for venting and one for aspiration. The vent needle is
the shorter of the two and faces the instrument. Note that the tubing
attached to the opening at the top of the vent needle leads to a vent
chamber on the left side of the Tower Module, while the tubing
attached to the opening at the top of the aspiration needle leads to
Y valve located between the Shear Valve and the Open Sample
Probe.
4. Hold the needle firmly with one hand and with the other hand use the pliers
to carefully work the Aspiration Tubing and Vent Tubing up and off the top
of the needle.
5. Loosen the Thumb Screw at the top of the Needle Mounting Assembly and
remove the clip holding the needle to the assembly.