9.2.1 Periodic Inspection
(continued)
To replace the rotor: refer to Figures 3-4 and 3-5. Position the rotor hub on the motor shaft so that the slots on
the underside of the hub are in line with the shaft pin. Press the rotor down until the shaft pin is seated in the hub
slots and 3-5 threads on the shaft protrude above the hub, about 6 mm (¼”). Secure the rotor to the motor shaft
with the head nut. Lightly tighten the nut with the wrench.
Also inspect the centrifuge housing and lid for cracks, missing pieces, or deformations.
Extended service life of the rotor requires that the assembly be cleaned only by the procedures and with the
approved agents specified in 9.2.2. Before using any cleaning or decontamination methods other than those
recommended by the manufacturer, users should check with the manufacturer that the proposed method will
not damage the equipment.
9.2.2 Rotor Cleaning Procedures
To clean,
always remove the rotor from the centrifuge
so that the procedure can be performed properly.
a. Cleaning Agents
The rotor assembly can be damaged by certain chemicals and disinfecting agents. Clean and disinfect the
rotor only with a solution containing a 1:10 dilution of commercial sodium hypochlorite (5%).
A 1:10 dilution is prepared by adding one (1) part of household bleach to nine (9) parts of water. Soak the rotor
in the dilute bleach for
at least ten (10)
min to destroy any viral and bacterial contaminants. BE SURE TO
REMOVE THE ROTOR PROMPTLY AFTER 10 MIN OF SOAKING IN THE BLEACH SOLUTION SINCE EXTENDED
EXPOSURE TO THE BLEACH CAN CORRODE THE ROTOR.
b. Rinsing and Drying
After soaking in the dilute bleach solution specified above, completely immerse the rotor in clean water. Rinse
again under running water to remove all traces of bleach.
Thoroughly dry the top and bottom surfaces of the rotor. Oven drying may be used, provided the temperature DOES NOT
EXCEED 53 ºC (126 ºF).
IMPORTANT:
The motor shaft, shaft pins and attaching hardware must also be clean and dry before
reassembly.
If the rotor is cleaned without removing it from the centrifuge (not a recommended procedure), wipe it with a cloth moistened
with water only. DO NOT USE THE ABOVE DILUTE BLEACH SOLUTION. Do NOT wipe the rotor with any other cleaning
agent, since it cannot be sufficiently rinsed off while the rotor is installed.
CAUTION
DO NOT USE ANY OTHER CLEANING AND DISINFECTING AGENTS,
SINCE THEY CAN CORRODE AND DAMAGE THE ROTOR. BE SURE TO
THOROUGHLY RINSE AND DRY THE ROTOR BEFORE RE-INSTALLING.
21
• Cracks, especially hairline cracks in the region adjacent to the hub;
• Surface corrosion, particularly in the region of the hub;
• Deep scratches or severe dents.
If any of the above defects are found, replace the rotor with a new assembly. See Section 9.6 for catalog numbers.
Also inspect the motor shaft, shaft pin and head nut for signs of wear, corrosion or damage. Replace any defective
parts or request repair service. Use the centrifuge only if all parts are in good condition.
Summary of Contents for QBC 425740
Page 1: ... QBC Capillary Centrifuge Operator s Service Manual ...
Page 5: ...iv ...
