Instruction manual

Operation

Rotor management

2-60 WX Ultra Series Thermo Scientific

2. Resetting zonal operation

Rotor management

It is very important to manage the life of each rotor you use with the ultracentrifuge. The warranted life

of the rotor is different depending on the type of rotor, the material the rotor is fabricated from and the

policy of the manufacturer of the rotor. The warranted life of a Thermo Ultracentrifuge rotor is defined

by a maximum number of runs. Other manufacturers use a combination of either the maximum

number of runs or a maximum number of hours to limit the warranted life of the rotor.

For some rotors, there exists a primary and a secondary life. The primary life is defined as the initial

usage at speeds up to the maximum rated speed of the rotor. Once this primary life is expended, the

rotor has a secondary life at speeds up to a derated maximum speed of the rotor-typically 90% of the

initial maximum rated speed.

Rotor life management

In order to comply with warranty requirements, rotor use must be documented in a rotor log book

provided with the ultracentrifuge.

Additionally, the Sorvall WX Ultra series ultracentrifuges have the capability to keep track of the

number of runs and hours of use for each rotor. This information can be used to automatically notify

the user of the need for deration at the end of the primary life and to preclude the use of rotors once

their warranted life as defined by these parameters have come to an end.

Step Key operation Screen display and considerations

1 On the Run Screen, use cursor keys to

move the cursor to ZONAL in the

FUNCTION field, and press

• ZONAL in the message

field disappears and the

machine status switches to

normal operation.

Note If no key operation is performed for 30 seconds, the cursor disappears and any entry is

disabled. At that time, press the cursor key to cause the cursor to blink once again.