Brookfield DV2+Pro Viscometer Manual de usuario descargar pdf (Pagina 89)

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Brookeld Engineering Labs., Inc. Page 89 Manual No. M03-165-F0612

Appendix H - Communications

WhenusingtheBrookeld ComputerCable (Brookeldpart #DVP-80),theDV-II+Prowill

outputadatastringatarateofapproximately3timespersecond.WhenusingtheBrookeld

PrinterCable(BrookeldPartNo.DVP-81),theoutputrateis1.0timespersecond.TheDV-

II+ProusesthefollowingRS-232parameterstooutputthesestrings:

Baud Rate 9600

Data Bits 8

Stop Bits 1

Parity None

Handshake None

The following formulas should be used to calculate and display the Viscometer data after each

packet of data is obtained from the DV-II+Pro.

Viscosity(cP) = 100 * TK * SMC * Torque

RPM

Shear Rate (

Sec

) = RPM * SRC

Shear Stress (

Dynes

) = TK * SMC * SRC * Torque

Where:

RPM = CurrentViscometerspindlespeedinRPM

TK = ViscometertorqueconstantfromAppendixD,TableD-2.

SMC = CurrentspindlemultiplierconstantfromAppendixD,TableD-1.

SRC = CurrentspindleshearrateconstantfromAppendixD,TableD-1.

Torque = CurrentViscometertorque(%)expressedasanumberbetween0and100.

As an example, consider an LV Viscometer using an SC4-31 spindle, running at 30 RPM and

currently displaying a Torque of 62.3 (%). First we list all of the given data and include model

andspindleconstantsfromAppendixD,TablesD-1andD-2:

RPM = 30 from the example statement.

TK = 0.09373 from Appendix D for an LV Viscometer.

SMC = 32.0 from Appendix D for a type SC4-31 spindle.

SRC = 0.34 from Appendix D for a type SC4-31 spindle.

Torque = 62.3 from the example statement.

Applyingthisdatatotheaboveequationsyields:

Viscosity(cP) = 100 * TK * SMC * Torque

RPM

= 100 * 0.09373 * 32.0 * 62.3

=622.9 cP

Shear Rate (

Sec

) = RPM * SRC

= 30 * 0.34

=10.2

Sec

Shear Stress (

Dynes

) = TK * SMC * SRC * Torque

=0.09373 * 32.0 * 0.34 * 62.3

=63.5

Dynes

1 2 ... 84 85 86 87 88 89 90 91 92 93 94 ... 100 101

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Brookfield DV2+Pro Viscometer Manual de usuario Pagina 89

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