Allow the scale to hang freely from its support ring.
Fill the container with exactly 1000cc of clear water. The slotted
holes located near the top of each container are designed to
initially retain slightly more than 1000 cc.
Using a file, carefully enlarge the bottom of the slotted holes
until water begins to leak out. Now the container will retain
exactly 1000 cc. Hang the container full of water on the scale hook.
Turn the zero adjustment screw located directly above the scale hook
until the scale pointer is vertical, reading 1.000 on the dial outer
ring. The scale is calibrated.
Attached to each scale is a dial face which has the following
specific gravity range of dry solids:
#1, 2.2. 2.6 2.8 3.2 3.6 4.0 4.4.
SPECIFIC GRAVITY OF DRY SOLIDS:
The desired sample should be dry and between -10 mesh and + 100 mesh
(Tyler). Hang the dry, empty container on the scale and pour in the
sample of dry material until the pointer indicates 1.000 kilogram on
the outer ring of the dial. (The container now has 1.000kg of
material in it.) Remove the sample carefully. Fill the container
one-third full with clear water and gradually stir in the dry
sample. Insure that the sample is thoroughly wet and that air
bubbles are eliminated. Hang the container on the scale and add
clear water up to the overflow holes. Read the dry solids specific
gravity on the innermost ring of the dial.
TAKING A SAMPLE:
Fill the container with the desired pulp or liquid. The liquid level
should reach the container spill holes. Wipe off any spilled
material on the outside of the container. Hang the filled container
on the scale and determine the pulp specific gravity or percent
solids in the pulp.
If you know the specific gravity of dry solids in the pulp (see
Determining the Specific Gravity of Dry Solids), you can directly
read the percentage in the pulp on the dial. Select the correct dial
face for the particular dry solid specific gravity in the pulp. Hang
the filled container on the scale. The percent solids in the pulp
reads clockwise from the specific gravity number on the red, white
and yellow rings of the dial face.
Example: A reading of 44% solids at 2.2 specific gravity also
reads 39% solids at 2.6 specific gravity and 35% solids at 3.2