Thermo Electron SORVALL RC3BP, Operating Instructions Manual

Page: 53 / 64

Maintenance SORVALL

Centrifuges
5-4
Customer Control Inspection
To keep your centrifuge in good working condition and ensure
accurate test results, we recommend that you check the speed con-
trols, timer controls and temperature controls at least twice a year.
If the bi-annual inspection reveals inaccurate results for any of these
controls, contact
Thermo
Service or your local representative for
SORVALL ® Products to arrange to have a qualified service techni-
cian 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 a strobe 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;
above 2000 rpm,
±
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.