Description of the PRECELLYS®24
Precellys
®
24
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2.2 Tube Motion
Due to the equipment’s design and symmetry, the 24 tubes strictly follow the same motion. This
ensures the same level of lysis and homogenisation for each sample.
The centre of gravity of the tubes follows a complex path on a sphere’s surface. While the mixture
contained in grinding tubes moves in all directions, it moves primarily in the vertical axis to allow
for efficient homogenisation. The movement generated by the PRECELLYS
®
24 equipment is called
a “precession” movement (i.e. grinding tubes are not rotated).
Each tube has a clearance of ± 8 mm depending on the main vertical axis.
These tubes must be compatible with the holder and they must withstand an acceleration of 600 g for
5 minutes without any deformation (see recommended reference for tubes § 2.5).
Biological sample homogenisation causes the temperature of the samples and the equipment to
increase.
2.3 Programming
The PRECELLYS
®
24 lyser / homogeniser has been designed to operate at a maximum speed of
6,800 rpm. A run consists of one or several cycles, between which the cover must not be opened.
Speed as well as other settings can be adjusted both in program 1 and program 2:
Parameter Operating range
Speed From 5,000 to 6,800 rpm in increments of 100 rpm
Number of cycles From 1 to 3
Cycle duration From 5 to 90 seconds in increments of 1 second
Waiting time between 2 cycles From 5 to 120 seconds in increments of 1 second
The operator is responsible for programming the unit. For each speed range, the manufacturer
recommends an operating range to prevent abnormal temperature rise. See § 6.3 for further details.
For high speed operation, it is recommended to reduce each cycle duration and let the unit cool
down between 2 cycles (at least 2 minutes). A security device disables the unit to prevent
overheating.
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