Product Description
The Asphalt Centrifuge Extractor is designed for use in the separation of asphaltic
mixtures to determine bitumen percentage. Models H-1451 & H-1474 series deluxe
Asphalt Centrifuge Extractor available in either 1,500 or 3,000 grams capacity are
designed to conform to explosion-proof standards for the safety of operating per-
sonnel.
The bowl is variable from 0-3,600 rpm and the extractor is provided with a brake
control for fast stopping. The aluminum bowl assembly is removable. A cup built
into the housing cover allows easy pouring of the solvent into the bowl. The unit is
supplied complete with 25 filter discs. Replacement filter discs are available from
Humboldt Mfg. Company.
Instructions refer specifically to 1,500 grams, motor driven extractor. In general, they
will also apply to the 3,000 grams model H-1474. Proportionally larger samples and
volume of solvent are used with the 3,000 grams bowl.
The machines are designed and built to provide many years of satisfactory services when
properly used. Closely follow operating instructions to assure accurate test results
and to avoid damage to the machines.
Related User Documentation
These operating instructions do not contain all the necessary information on the specific
test procedures. Please refer to ASTM D-2172 or AASHTO T-164 for additional test-
ing information.
Operation
1. Release clamps and remove upper housing cover (#10, Fig. 1 or 2).
2. Lift bowl assembly from spindle. Remove knurled nut (#5) and lid (#4).
3. Place approximately 1/3 of the extractor capacity of the bituminous sample
in the bowl.
NOTE:
To shorten the testing procedure time, pre-warm the sample to a soft
consistency before placing in the bowl. Do not heat the bowl. Do not overheat
the sample.
4. Distribute the sample evenly around the bowl taking care not to crush any
individual particles. If sample is preheated allow it to cool before proceeding to
the next step.
5. Weigh bowl and sample. Record weight.
6. Assure the bowl lip is clean and place filter disc (#3) on it. Place bowl lid (#4) on
bowl and secure with knurled nut (#5). Turn nut snugly by hand.
Caution:
Over tightening may distort the bowl lid.
7. Place the bowl assembly in the extractor with the shaft pin
(#25, Fig. 1; #26, Fig.2) seated in the notch at the bottom of the bowl.
