6.4.2.1 The DCT probe is to be immersed by more than its
minimum immersion depth in a constant temperature bath so
that the center of the probe’s sensing region is at the same level
as the lower half of the working capillary provided the probes
minimum immersion depth is met and is no less than indicated
on calibration certificate. See Fig. 1. The end of the probe
sheath shall not extend past the bottom of the viscometer. It is
preferable for the center of the sensing element to be located at
the same level as the lower half of the working capillary as
long as the minimum immersion requirements are met.