Humboldt H-1751 Vacuum Pycnometer - Manual (Page 2)

Introduction
This Vacuum Pycnometer is used in Rice Testing to determine the maximum
specific gravity of bituminous paving mixtures with maximum aggregate size
up to 19.1mm (3/4 inch). Designed for operator safety, set includes aluminum
volumetric canister, volumetric lid, flat Plexiglas vacuum lid with o-ring,
volumeter, release valve and fittings, metal water vacuum aspirator with 3/8"
IPT, 6' hose. Unit achieves vacuum using an aspirator or optional vacuum pump.
Order H-1756 vibrating table or H-1782 de-airing table and H-1752, H-1754 or
H-1754D manometer separately. Replacement parts are available separately.
Meets ASTM D2041 & AASHTO T209, T283.
Attach Aspirator to a water supply that will maintain a constant, high flow rate.
Attach one end of vacuum hose to Aspirator. Attach the other end of vacuum
hose to hose nib on the vacuum lid.
Note: After extended use the Aspirator may lose performance because of solids
build up from water.
Operating Instructions
Place vacuum lid on volumetric-check seating of rubber o-ring.
Close release valve.
Turn on water to run through Aspirator-observe direction of vacuum with a
vacuum gauge. If the unit seals, the needle on the gage will change reading.
Tap gage lightly as the vacuum is drawn. Vacuum is to be minimum of 28
inches, and compliance with the standards requires an absolute pressure
manometer.
If a seal is not obtained recheck above procedure and then place light pressure
on the vacuum lid with your hands.
Clean Up
To remove vacuum lid-open release valve to allow air and enter the volumeter.
Do not try to remove the lid or turn off water while vacuum is drawn on
volumeter.
Remove o-ring from vacuum lid. Clean o-ring and wipe its contact surface on
vacuum lid and volumeter.
Store in safe place until needed again.