Rotor Chamber; Drive; Temperature Sensing And Control (Refrigerated Models Only); Interior View Of The Rotor - Beckman Coulter Microfuge 20 Series Instructions For Use Manual

Description

Temperature Sensing and Control (refrigerated models only)

Rotor Chamber

The rotor chamber is shown in
shaft are visible in the chamber bottom. A gasket system around the chamber opening ensures
sealing. (Instrument gaskets have not been designed as bioseals for aerosol containment.)
Figure 1.3 Interior View of the Rotor Chamber
1. Drive Shaft
2. Boot

Drive

The asynchronous three-phase direct-drive motor is brushless for clean, quiet operation. A tie-
down screw is used to attach the rotor to the drive shaft. The resilient suspension ensures that loads
are not disturbed by vibration, and prevents damage to the drive shaft if an imbalance occurs
during centrifugation. Maximum braking may be selected to reduce deceleration time, allowing fast
processing of samples; alternately, delicate gradients may be preserved using slower deceleration.
Temperature Sensing and Control (refrigerated models only)
With the power on, the temperature control system is activated when the door is closed. The run
temperature can be set between –10 and +40°C in refrigerated models. If no set temperature is
entered, the centrifuge automatically selects the last entered temperature. (For the first run of a
new centrifuge, the instrument selects 20°C as its operating temperature.) A thermistor in the rotor
chamber continuously monitors chamber temperature. The micro-processor calculates the
required chamber temperature to maintain the selected rotor temperature.
NOTE
In the unlikely event of a complete cooling system failure, the drive switches off if the chamber
temperature goes above 50°C. Restarting the centrifuge is not possible until the chamber is cooled.
1-4
Figure 1.3. The drive shaft and rubber boot surrounding the drive
3. Gasket
B30162AA