Derating Tables - Fisher Scientific MARATHON 3000 Operation Manuals

4.3

Derating Tables

Dense Samples
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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 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
31
Derating Factor for:
Specific Gravity Swinging Bucket
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
1.000
.960
.925
.894
.866
.839
.816
.794
.774
.755
.738
.721
.707
.692
.678
.666
.654
.642
.632