Brookfield DV1 Viscometer Manual de usuario descargar pdf (Pagina 35)

Brookeld Engineering Laboratories, Inc. Page 35 Manual No. M14-023

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 CPA cones.

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

Cone/Plate. Brookeld oers 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 F-1 and

F-2 in Appendix F 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: DV1MLV Viscometer, Cone Spindle CPA-42Z, Brookfield 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. us, the viscometer reading should be

97% torque and 9.7 cP viscosity ± 0.197 (closer to ±0.2) cP. e 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 o, remove the sample cup and place the viscosity standard uid into the cup.

Cone Part No. Sample Volume

CPA-40Z, CPE-40, CP-40 0.5 mL

CPA-41Z, CPE-41, CP-41 2.0 mL

CPA-42Z, CPE-42, CP-42 1.0 mL

CPA-51Z, CPE-51, CP-51 0.5 mL

CPA-52Z, CPE-52, CP-52 0.5 mL

Table A-1

4. Attach the sample cup to the viscometer and allow su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: e 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.

* e CPA or CPE designation on the cone spindle indicates use with Electronic Gap Setting

Cone/Plate Viscometers/Rheometers only.

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Brookfield DV1 Viscometer Manual de usuario Pagina 35