Appendix A - Cone/Plate Rheometer Set Up; Electronic Gap Setting Features - Ametek BROOKFIELD DVNext Operation Instructions Manual

APPENDIX A - CONE/PLATE RHEOMETER SET UP

This Cone/Plate version of the DVNext uses the same operating instruction procedures as described in this manual.
However, the "gap" between the cone and the plate must be verified/adjusted before measurements are made. This
is done by moving the plate (built into the sample cup) up towards the cone until the pin in the center of the cone
touches the surface of the plate, and then by separating (lowering) the plate 0.0005 inch (0.013 mm).
When operating the Cone/Plate at elevated temperature, the gap must be set with the cup and spindle equilibrated
at the temperature recommended. Maximum temperature for Cone/Plate operation is 80ºC. Maximum operational
temperature of sample cup is 100º C. Personal protection is recommended when controlling to temperatures above
80ºC.
Micrometer Adjustment Ring will become hot when controlling sample cup at temperatures above 50°C.
Programmable DVNext Cone/Plate Rheometers, S/N 50969 and higher, have an Electronic Gap Setting feature. This
feature enables the user to easily find the 0.0005 inch gap setting that was established at AMETEK Brookfield prior
to shipment.
AMETEK Brookfield recommends that the maximum particle size in the sample material for measurement with cone/
plate geometry be less than 5 times the gap settings. A more conservative approach is to limit the maximum particle
size to less than 10 times the gap setting.
The following information explains how to set the Electronic Gap and verify calibration of the DVNext Rheometer.
A.1 Electronic gap setting features
Figure A-1
Sliding Reference Marker is used after finding the "hit point;" it is the reference for establishing the 0.0005 inch gap.
Micrometer Adjustment Ring is used to move the cup up or down in relation to the cone spindle. Turning the ring left
(clockwise) lowers the cup; turning it right (counterclockwise) raises the cup. Each line on the ring represents one
scale division and is equivalent to 0.0005 inch movement of the plate relative to the cone.
M19-2101 REVISION 2.0 D V N E X T R H E O M E T E R - O P E R AT I O N A L M A N U A L 87