Brookfield DV2+Pro Viscometer Manual de usuario descargar pdf (Pagina 68)

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Brookeld Engineering Labs., Inc. Page 68 Manual No. M03-165-F0612

A.4 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.

 BrookeldusesmineraloilviscositystandarduidstocalibrateWellsBrookeldCone/Plate

Viscometersatthefactory.Brookeldrecommendsthatcustomersusemineraloilviscosity

standarduidswhenyouperformacalibrationcheck.

 Ifyoudecidetouseasiliconeviscositystandarduid,donotusea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-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-II+ Pro Viscometer, Cone Spindle CPA-42Z, 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cP.Theallowableerror(±0.197cP)isacombination

ofViscometeraccuracyanduidtolerance(refertoInterpretation of Calibration Test Results

in Appendix E).

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

Table A-1

Cone Part No.

CPA-40Z, CPE-40, CP-40

CPA-41Z, CPE-41, CP-41

CPA-42Z, CPE-42, CP-42

CPA-51Z, CPE-51, CP-51

CPA-52Z, CPE-52, CP-52

Sample Volume

0.5 mL

2.0 mL

1.0 mL

0.5 mL

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).

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 or CPA designation on the cone spindle indicates use with Electronic Gap Setting

Cone/Plate Viscometers/Rheometers only.

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