D156_10 (15)
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Flush the oil tube with a
portion of the test specimen,
taking care to allow the
tube to drain thoroughly.
Fill the oil tube with
the test specimen.
Compare with a whole
color standard.
Fill the oil tube with
the test specimen.
Compare with a whole
color standard.
When the test specimen
is lighter than the color
standard, remove the
standard and replace it
with a half standard.
When the sample is darker
than the single hole standard,
at 6 and 1/4 inch
or 150 millimeters
add another hole standard.
Warning.
It is important that all
samples in the color tubes
be free from air bubbles.
With the proper color
standard or standards in place
and the test specimen in the
oil tube at a level where
it's color is decidedly
darker than that of the color
standard, draw off
the test specimen
slowly by means of the
petcock until the oil
appears just slightly darker
than the color standard.
From this point, draw
the test specimen level
down to the nearest depth
corresponding to color number,
as shown in Table 1 of
the written standard.
When the color of the oil
observed through the eyepiece
is still darker than
the color standard,
draw the oil down
to the next depth
given in Table 1 of the
written standard and compare.
Continue this
operation until a depth
is reached where the
test specimen and color
standard match or show
questionable differences.
At this point,
lower the oil column
to the next specified
depth, and when
the oil is unmistakably lighter
than the color standard,
record the color corresponding
to the next higher
level as a Siebel color.
Experience in the use
of this instrument
will obviate the necessity
of following this step
by step procedure outlined in
section 10.2 of the written
standard for choosing
the proper color
standards for each sample.
Examples of the procedure are
given in Table 2 of the written
standard.