Brookfield DV-II+ Digital Viscometer Manual do Utilizador descarregar pdf (Página 41)

- 41 -

Appendix G - Communications

When using the Brookfield Computer Cable (Brookfield part # DVP-80), the DV-II+ will output a

data string at a rate of approximately 2.5 times per second. When using the Brookfield Printer Cable

(Brookfield Part No. DVP-81), the output rate is 1.0 times per second. The DV-II+ uses the follow-

ing 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+.

Viscosity (cP) = 100

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 D2.

SMC = Current spindle multiplier constant from Appendix D, Table D1.

SRC = Current spindle shear rate constant from Appendix D, Table D1.

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

spindle constants from Appendix D, Tables D1 and D2:

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

SMC

Torque

RPM

= 100 * 0.09373 * 32.0 * 62.3

= 622.9 cP

Shear Rate (

Sec

)=RPM

SRC

= 30 * 0.34

= 10.2

Sec

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 50 51

Comentários a estes Manuais

Sem comentários

Brookfield DV-II+ Digital Viscometer Manual do Utilizador Página 41

Comentários a estes Manuais

Manuais e produtos relacionados com Instrumentos de medida Brookfield DV-II+ Digital Viscometer