BICO Electric Rotarex - Manual (Page 4)

TO REMOVE THE BOWL: Stabilize the bowl and cover with one hand while removing the
filler screw COUNTER-CLOCKWISE. The bowl can now be lifted and removed.
TO INSTALL THE BOWL: REVERSE PROCEDURE. Steel stem is slotted and bottom of
bowl is slotted. Slots MUST line up. Rotarex must NOT be run without filler screw and cover.
Periodic cleaning of the drain spout will eliminate backup in the receptacle and subsequent
leakage and damage to the motor.
TEST
PROCEDURE
1. Prepare sample according to instructions in official hand books of test methods; ASTM or
AASHO references are shown below.
2. Weigh out desired quantity of sample, and distribute evenly and uniformly around the bowl to
avoid unbalanced loading. This even distribution and a slow start will allow the material to
disperse properly and minimize excessive vibration. Rubber mounts used in installation will
absorb normal vibrations.
3. The filter ring should be placed between the bowl and bowl cover. The cover is clamped
tightly to the bowl by tightening the filler screw. A measured quantity of solvent is added
through the filler screw. Small holes in the cover prevent the receptacle from becoming air
bound.
4. START SLOWLY: In addition to reasons previously stated, this allows the solvent time to
dissolve the sample before maximum speed is attained and extraction occurs.
5. MAINTAIN SPEED: For 15 seconds. This forces the solvent through the filter paper ring
between the bowl and the cover.
6. EXTRACTED SOLVENT Drains from the receptacle through the drain spout and should be
collected in a beaker or other container.
7. REPEAT For the prescribed number of solvent additions specified in the following referenced
methods.
8. CAUTION ON SOLVENTS: Although benzene is approved in the manual of test methods,
the use of Triclor-ethylene is recommended. Avoid spilling solvent on control box.
REFERENCES
ASTM Test Method for Quantitative Extractions of Bitumen from Bituminous Paving Mixtures -
Designation D2172-72.
A.A.S.H.O. Part 2 - Tests for Highway Materials - Designation T164-70.
These official test methods should be consulted for detailed methods of procedure. Instructions
pertain only to specific operation of the Rotarex.