RC12
BP™
Maintenance
5-3
Customer Control Inspection
To keep your centrifuge in good working condition and ensure
accurate and consistent results, we recommend that you use the
following procedures to check the speed control, timer control and
temperature control at least twice a year or more often as your
procedures dictate.
If any of these control checks reveal a control inaccuracy, contact
Thermo Service or your local representative for SORVALL
®
Products
to arrange to have a qualified service technician recalibrate the
controls.
Speed Controls
1. Prepare a sample of test fluid. Load and balance the rotor
according to the instructions in the rotor manual.
2. Install the rotor in the chamber and close the chamber door.
3. If the RCF or SLOW START indicators are lit, press
MENU, then press ENTER until the correct selection screen
appears. Press 0 to deselect each option (indicator will turn
OFF), then press MENU to return to the HOME screen.
4. Set the run parameters for a commonly used protocol, with
SPEED controlled by rpm, and run duration set to HOLD.
5. Press START, wait for the SPEED value in the RUN display
to reach the specified SET speed, then wait an additional 5
minutes for speed to stabilize.
6. Using an optical tachometer, check rotor speed through the
viewing port in the center of the chamber door (in rpm,
following instructions supplied with the tachometer).
The tachometer should indicate rpm equal to the SET value ±20
rpm or 1%, whichever is greater (2000 rpm and below, ±20 rpm;
above 2000, ±1%). If necessary, repeat this procedure at other
speeds that are commonly used in your protocols.
Timer Controls
1. Prepare a sample of test fluid. Load and balance the rotor
according to the instructions in the rotor manual.
2. Install the rotor in the chamber and close the chamber door.
3. Set the run parameters for a commonly used protocol, but set
the run duration by TIME (MIN:SEC) to 13:30.
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