Rotor Chamber; Vacuum System; Temperature Sensing And Control; Drive - Beckman Coulter Optima XE Series User Manual

Description

Rotor Chamber

Rotor Chamber
The rotor chamber is made of aluminum and coated with a chemical-resistant epoxy finish. The
central feature is the rotor drive spindle, but several sensors and control systems are also contained
in the rotor chamber.

Vacuum System

The Optima XE uses a diffusion pump in series with a mechanical vacuum pump to reduce chamber
pressure to a very low level. The system starts automatically when you start a run, or manually
when the chamber door is closed and you use the
Home Page. When the vacuum system is on, the chamber pressure is displayed in microns in the
Display/Button.
Vacuum
At the end of a run, press the
attempting to open the door. When the chamber vacuum is reduced to the point that you can open
the door, the system sounds an audible tone. After you open the door, there is a five minute period
where the chamber temperature remains as set (to allow back-to-back runs). Then the chamber
returns to approximate room temperature to minimize condensation collecting in the chamber. To
help keep the chamber dry and clean, keep the door closed whenever possible. If you wish to vent
the chamber before the rotor has come to a complete stop, you can do so as soon as it slows below
3000 rpm.
In zonal or continuous flow operation, the door may remain open while the rotor is spinning up to
the loading speed. The vacuum system is activated when the door is closed and the rotor speed is
above 3000 rpm (after loading the rotor). Normally, you vent the chamber at the end of the run
when the rotor has decelerated to the unloading speed, but you can vent the chamber when the
rotor has decelerated below 3000 rpm if the unloading speed is slower than that.

Temperature Sensing and Control

A solid state thermopile in the bottom of the rotor chamber monitors rotor temperature.
The Optima XE uses a solid state thermoelectric refrigeration and heating system without coolant
or water. Cooling is provided by forced air from the fans.
When the power is on, the temperature control system starts when the door is closed and the
vacuum system is running.

Drive

The frequency-controlled, air-cooled, direct-drive induction motor requires no gears or brushes. In
addition, the drive does not require an oil vacuum seal, external oil reservoir, or continuously
operating damper. Externally cooled by forced air and internally cooled by oil, the drive delivers
ultra-smooth, quiet performance, with high rotor-imbalance tolerance.
2-2
Vacuum
Display/Button to vent the chamber vacuum before
Vacuum
Display/Button on the Footer Bar of the
PN B07711AA