Brookfield CAP1000 Viscometer - Manual (Page 22)

Brookfield Engineering Labs., Inc. Page 20 Manual No. M02-32A0607
III.4 Cone Calibration
A special feature of the CAP Series Viscometers allows the user to perform a cone calibration
using Viscosity Standard Fluids. This field calibration will accommodate any wear on the tip
of the cone which may result from contact with the plate.
Note: A cone calibration should be performed when: 1) using a new cone for the first time,
2) switching between two cones of the same number and 3) verification of calibration
provides data outside of the acceptable range.
Refer to Tables III-5 and III-6 to choose the calibration fluid for the spindle being calibrated.
1. Turn on the CAP 1000+ Viscometer.
2. Attach solvent trap to coupling shaft.
3. Attach spindle.
4. Place appropriate amount of sample onto the center of the Viscometer plate directly below
the spindle.
5. Pull down the handle, locking it into the lowest position, placing the spindle in contact with
the plate.
6. Lower the solvent trap.
Note: The solvent trap must be utilized when calibrating to ensure proper temperature con-
trol.
7. Select the spindle to be calibrated by using the SPINDLE key.
8. Select YES for CALIBRATE and press ENTER.
9. Enter the appropriate values for temperature (°C) and viscosity (cP) prompted by the
screen.
Note: Viscosity values are always entered in units of CENTIPOISE (cP) no matter what units
have been selected as unit of measure for normal operation.
100 cP = 1P; 1cP = 1mPa•s; 1000 cP = 1Pa•s
Note: The Viscometer temperature control must be identical to the specified temperature for
the viscosity standard when executing the calibration. Normally calibration will be at
25°C for “L” Series CAP Viscometers and 60°C for “H” Series CAP Viscometers.
10. Allow at least 30 minutes for thermal equilibrium of the plate, calibration fluid and spindle,
from instrument cold start.
11. Press the RUN key to start the calibration.