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5
Customer Control Inspection
Speed Controls
To keep your centrifuge in good working condition and ensure accurate test results, Thermo Fisher
Scientific recommends that you check the speed controls, timer controls and temperature controls at
least twice a year. If the bi-annual inspection reveals inaccurate results for any of these controls, inform
Customer Service to recalibrate the controls.
Speed Controls
1. Prepare a sample of test fluid.
2. Load and balance the rotor according to the instructions in the rotor manual.
3. Install the rotor in the chamber.
4. Close the chamber door.
5. Set the run parameters for a commonly used protocol, with SPEED controlled by rpm, and run
duration set to HOLD.
6. Deselect RCF or SLOW START if indicators are lit.
7. Press START key .
8. Wait for the SPEED value in the RUN display to reach the specified SET speed. Wit an additional
5 minutes for speed to stabilize.
9. Check rotor speed through the viewing port in the centrifuge door using a strobe tachometer (in
rpm, following instructions supplied with the tachometer).
The tachometer should indicate rpm equal to the SET value 20 rpm or
below,
10. If necessary, repeat this procedure at other speeds that are commonly used in your protocols.
Timer Controls
1. Prepare a sample of test fluid.
2. Load and balance the rotor according to the instructions in the rotor manual.
3. Install the rotor in the chamber.
4. Close the chamber door.
5. Set the run parameters for a commonly used protocol, but set the run duration by TIME
(MIN:SEC) to 10:00.
6. Press START key .
7. Using a stopwatch, begin timing precisely as the RUN TIME display counts down to 10:00. Then
stop timing precisely as the RUN TIME display counts down to 00:00.
The stopwatch should read between 9:30 to 10:30, representing 10:00
additional second to allow for cumulative human error.
8. If necessary, repeat this procedure at other time ranges that are commonly used in your protocols.
5-2
RC B
IOS
±
±
20
, above 2000 rpm,
1
%).
±
1
%, (2000 rpm and
±
5
% (29 seconds) plus an
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