Brookfield DV-III Ultra Rheometer Bedienungsanleitung PDF herunterladen (Seite 110)

Brookeld Engineering Laboratories, Inc. Page 110 Manual No. M98-211-E0912

Two constants are required:

a) SMC (Spindle Multiplier Constant) which is used to calculate cP value.

b) SRC (Shear Rate Constant) which is used to calculate Shear Rate and Shear Stress.

If SRC=0 (Example, LV #1-4, RV,HA,HB #1-7 spindles), Shear Rate and Shear Stress values are

not calculated and can not be displayed.

The SMC value for a spindle may be calculated as follows:

a) For new spindle conditions you calculate the SMC using a Newtonian uid of known

viscosity (Brookeld Viscosity Standard). This is done in the container with the new

dimensions at the controlled temperature specied for the viscosity standard uid.

b) The new full scale viscosity range is calculated for a selected RPM:

R1 =

100 n

Where:

R1 = The new full scale viscosity range

n = The viscosity (in cP) of the Newtonian uid

Y = The Torque % reading at the selected RPM

c) The SMC Value is then calculated:

SMC

[Full Scale Viscosity Range (cP)]

[Selected RPM]

10,000

Where:

TK = DV-III Ultra Torque Constant from Table D-2

The SRC value may be calculated for cylindrical spindle geometry using the following equation:

Shear Rate (1/sec) =

________________

2w R

]

Where:

= Radius of the container (in centimeters)

= Radius of the spindle (in centimeters)

χ = Radius at which the shear rate is to be calculated (normally the same value as

; in centimeters)

w = Angular velocity of the spindle (Rad/Sec)

w = *N

N = Spindle speed in RPM

SMC and SRC values are entered in RHEOCALC software. See the HELP le for details.

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Brookfield DV-III Ultra Rheometer Bedienungsanleitung Seite 110