Brookfield DV-I Prime Manual de usuario descargar pdf (Pagina 46)

Brookeld Engineering Laboratories, Inc. Page 46 Manual No. M/07-022-D0613

A.5 Verifying Calibration

1. Determine the appropriate sample volume. Refer to Table A-1 to determine the correct sample

volume required for the spindle to be utilized.

2. Select a Brookeld Viscosity Standard uid that will give viscosity readings between 10% and

100% of Full Scale Range. Refer to Appendix B for viscosity ranges of cone spindles; ranges

listed apply to CPE cones.

Do not use a silicone viscosity standard uid with a viscosity value greater than 5000 cP with a

Cone/Plate. Brookeld offers a complete range of mineral oil viscosity standards suitable for

use with Cone/Plates for viscosities above 5,000 cP or shear rates above 500 sec

-1

; see Table E-1

and E-2 in Appendix E for a list of available uids.

It is best to use a viscosity standard uid that will be close to the maximum viscosity for a given

cone spindle/speed combination.

Example: LVDV-I PRIME Viscometer, Cone Spindle CPE-42, Brookeld Silicone

Viscosity Standard having a viscosity of 9.7 cP at 25°C.

At 60 RPM, the Full Scale Viscosity Range is 10.0 cP. Thus, the viscometer reading should be

97% torque and 9.7 cP viscosity ± 0.197 (closer to ±0.2) cP. The accuracy is a combination of

viscometer and uid tolerance (refer to Interpretation of Calibration Test Results at the end

of Appendix E).

3. With the motor off, remove the sample cup and place the viscosity standard uid into the cup.

Cone Part No.

Sample Volume

CPE-40

0.5 mL

CPE-41

2.0 mL

CPE-42

1.0 mL

CPE-51

0.5 mL

CPE-52

0.5 mL

Table A-1

4. Attach the sample cup to the viscometer and allow sufcient time for the sample, cup and cone

to reach temperature equilibrium.

5. Turn the motor on. Set the desired speed(s). Measure the viscosity and record the reading in

both % torque and centipoise (cP).

NOTE: The cone spindle must rotate at least ve (5) times before a viscosity reading is

taken.

6. Verify that the viscosity reading is within the allowable 1% deviation, as explained earlier, for

the specic viscosity standard uid(s) that you are using.

* The CPE designation on the cone spindle indicates use with Electronic Gap Setting Cone/Plate

Viscometers/Rheometers only.

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Brookfield DV-I Prime Manual de usuario Pagina 46

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