Main differences between Liston centrifuges and their cheap analogs

02 june 2015
Main differences between Liston centrifuges and their cheap analogs

1. Brushless motor.
First, brushless motor is a type of motor that does not require any service or maintenance during the centrifuge lifecycle. Unlike brushless motor – the motor with brushes require periodic maintenance (you have to change the brushes every 6-8 months). You will need to disassemble the whole centrifuge in order to change them, which is not always possible to be done by the user and requires service organization. 
Second – during work motor with brush produces coal and copper dust, which is not acceptable in many modern labs.
European and American manufacturers left behind these types of motors in 90’s.

2. Precise speed sensor.
Modern sample preparation (centrifugation of any liquid) technology requires precise control of RCF (Relative Centrifugation Force) which is closely tied with centrifugation speed. Liston centrifuges are equipped with Hall speed sensors (C 2201, C 2202, C 2203) or Optic speed sensor (C 2204 Classic). These sensors have two-way communication with electronic control of the centrifuge, which guarantees that the speed will be exactly the one that was set by the user, regardless the quantity of tubes, voltage surges, etc. Cheap centrifuges without two-way sensors are calibrated at the factory in ideal environment (stable voltage, equally filled tubes, etc.) and their speed is controlled by potentiometer which , in real life, can cause difference in set speed and spin speed up to 20%

3. Bucket (swing-out) rotor.
This type of rotor allows to centrifuge tubes with working angle of 90 degrees (parallel to the table surface) which is, sometimes, obligatory for certain tests (e.g. tubes filled with gel). Cheap angle rotors have 45 degrees working angle