Malvern Visco 88, User Manual, Page: 30 / 74

Chapter 3 Making a measurement
Page 3-8 MAN 0378
Fitting and loading plate systems
If using a cup and bob measuring system, skip this section.
To insert the upper measurement system in the viscometer:
1.
Lift the chuck slightly upwards and hold it there.
2.
Push the shaft of the cone or upper plate up into the chuck carefully until it
clicks into place.
3.
Release the chuck then pull the shaft down a few mm. It should slide down
then click into position. If not, turn the measuring system slightly and repeat.
Setting the correct gap
For cone and plate/parallel plates, use of the correct gap between the measuring sys-
tems is crucial. An incorrect gap will lead to errors in the results, especially with
small gaps or small cone angles.
Set up the supplied cones with gaps as follows:
„
1° cone – with a gap of 0.03mm (30µm).
„
2.5° cone – with a gap of 0.07mm (70µm).
„
5.4° cone – with a gap of 0.15mm (150µm).
To set the gap for a cone manually:
1.
If it’s not already fitted, fit the lower plate system onto the viscometer stand
below the viscometer and clamp it tightly (by hand only).
2.
If the lock nut

on the gap adjustment screw is at the top of its thread, loosen
it so it moves downwards a few turns. Adjust the gap adjustment screw
upwards until about 10mm

of it protrudes above the collar, like this:
ill 7446
PP