BICO Oil Centifuge - Manual (Page 2)

PROCEDURE
The sample should be thoroughly representative of the material in question and the portion used should be
thoroughly representative of the whole sample.
Exactly 50 ML of industrial 90 benzene (ASTM Spec. D837) shall be measured into each of multiples of two
tubes, tubes to be like style for opposed balance, and exactly 50 ML of the oil to be added to each. Prior to
insertion of the filled tubes into their trunion rings, they should be tightly stopped and then shaken vigorously
until the contents are thoroughly mixed.
At this point in the procedure the tubes should be immersed to the 100 ML mark for ten (10) minutes in a
bath. The bath apparatus shall be either a solid metal block bath or a liquid bath of sufficient depth for
immersing the centrifuge tubes in a vertical position. Means shall be provided for heating the bath to 120 F
(40 C).
After ten (10) minutes of immersion, the tubes should be removed from the bath and again vigorously
shaken for ten (10) seconds. Outside moisture dried, and talcum applied. Then place the tubes in their
respective shields, placed in opposite (opposed) position trunion rings in the centrifuge head. Close and
latch the hinged door cover in the top of the centrifuge to prevent escape of any explosive gases.
The recordings are considered constant which do NOT exceed 0.2 ML differential.
Repeat the centrifuging steps above until three (3) successive recordings are constant in results. This
generally requires no more than four (4) whirlings.
STARTING AND STOPPING MOTOR
It is not necessary to provide a special control to insure slow starting. BICO, INC. designed a special slow
starting motor as an integral component to afford maximum safety and prevention of glass breakage from
too rapid acceleration.
Smooth, even deceleration is accomplished by BICO, INC.'s, exclusive spring-loaded braking mechanism
which allows a prompt smooth stop at the completion of the tests. This body of the centrifuge and brake
force is applied to the head not the motor shaft, and minimum force is required. Mechanism is self-
adjusting, no adjustments are ever necessary.