4.3 Derating
Tables
Dense Samples
The Speed and Force Tables list the maximum speed for
each rotor/adapter combination for the Marathon Series.
These speeds are specified for samples whose specific
gravity is not greater than 1.2, for swinging bucket rotors.
For denser samples, the maximum specified speed is
reduced (derated) by a factor from the table below:
Derating Factor for:
Specific Gravity
Swinging Bucket
1.2 1.000
1.3 .960
1.4 .925
1.5 .894
1.6 .866
1.7 .839
1.8 .816
1.9 .794
2.0 .774
2.1 .755
2.2 .738
2.3 .721
2.4 .707
2.5 .692
2.6 .678
2.7 .666
2.8 .654
2.9 .642
3.0 .632
Derating Example:
A rotor rated for 4,000 RPM, used
with samples with a specific gravity of 1.4, cannot spin
faster than 3,700 RPM. (4,000 x .925 = 3,700)
MARATHON Series Operation Manual
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