11.1 Introduce a small amount (about 0.7 mL) of sample
into the clean, dry sample tube of the instrument using a
suitable syringe.
11.2 The sample can also be introduced by siphoning.
Plug the external TFE-fluorocarbon capillary tube into the
lower entry port of the sample tube. Immerse the other end
of the capillary in the sample and apply suction to the upper
entry port using a syringe or vacuum line until the sample
tube is properly filled.
11.3 Turn on the illumination light and examine the
sample tube carefully. Make sure that no bubbles are trapped
in the tube, and that it is filled to just beyond the suspension
point on the right-hand side. The sample must be homogeneous
and free of even the smallest bubbles.
NOTE G--If the sample is too dark in color to determine the absence
of bubbles with certainty, the density cannot be measured within the
stated precision limits of Section 14.
1 1.4 Turn the illumination light off immediately after
sample introduction, because the heat generated can affect
the measurement temperature.
11.5 After the instrument displays a steady reading to four
significant figures for density and live for T-values, indicating
that temperature equilibrium has been reached, record
the density or T-value.