Brookfield DV-III Ultra Rheometer Bedienungsanleitung Seite 105
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Brookeld Engineering Laboratories, Inc. Page 105 Manual No. M/98-211-B0104
Brookeld Engineering Laboratories, Inc. Page 105 Manual No. M98-211-E0912
APPENDIX C - Variables in Viscosity Measurements
As with any instrument, there are variables that can affect a viscosity measurement. These variables
may be related to the instrument (Rheometer) or the test uid. Variables related to the test uid deal
with the rheological properties of the uid, while instrument variables would include the Rheometer
design and the spindle geometry system utilized.
RHEOLOGICAL PROPERTIES
Fluids have different rheological characteristics that can be described by Rheometer measurements. We
can then work with these uids to suit our lab or process conditions.
There are two categories of uids:
Newtonian - These uids have the same viscosity at different Shear Rates (different
RPM’s) and are called Newtonian over the Shear Rate range they are
measured.
Non-Newtonian - These uids have different viscosities at different shear rates (different
RPM’s). They fall into two groups:
1) Time Independent non-Newtonian
2) Time Dependent non-Newtonian
The time dependency is the time they are held at a given Shear Rate (RPM).
They are non-Newtonian, and when you change the Rheometer spindle
speed, you get a different viscosity.
Time Independent
Pseudoplastic - A pseudoplastic material displays a decrease in viscosity with an increase
in shear rate, and is also known as “shear thinning”. If you take Rheometer
readings from a low to a high RPM and then back to the low RPM, and the
readings fall upon themselves, the material is time independent pseudoplastic
and shear thinning.
Time Dependent
Thixotropic - A thixotropic material has decreasing viscosity under constant shear rate. If
you set a Rheometer at a constant speed, recording viscosity (cP) values over
time and nd that the viscosity (cP) values decrease with time, the material
is thixotropic.
Brookeld publication, “More Solutions to Sticky Problems” includes a more detailed discussion of
rheological properties and non-Newtonian behavior.
Rheometer Related Variables
Most uid viscosities are found to be non-Newtonian. They are Shear Rate dependent on the measurement
conditions. The specications of the Rheometer spindle and chamber geometry will affect the viscosity
readings. If one reading is taken at 25 rpm, and a second at 50 rpm, the two viscosity (cP) values produced
will be different because the readings were made at different shear rates. The faster the spindle speed,
the higher the shear rate.
The shear rate of a given measurement is determined by: the rotational speed of the spindle, the size
and shape of the spindle, the size and shape of the container used, and therefore, the distance between
the container wall and the spindle surface.
- BROOKFIELD DV-III ULTRA 1
- Table of Contents 3
- I. INTRODUCTION 5
- Maximum Torque Value 6
- Component Part Number 7
- Ball Bearing Option: 10
- Electrical Certication: 10
- CLAMP ASSEMBLY 12
- DV-III Ultra 12
- HEAD UNIT 12
- TENSION SCREW 12
- Connector 14
- RS-232 Serial 14
- Printer/Computer 14
- STRIP CHART RECORDER 16
- II. GETTING STARTED 18
- “REMOVE SPINDLE, LEVEL 18
- KEY.” Press a key 18
- TORQUE LESS THAN 0% 21
- SELECT SPDL key. The DV-III 21
- MOTOR ON/OFF/ESCAPE key 21
- one minute. 150 seconds 32
- USE SET:_ 33
- STEP TIME = 00:05 33
- USING PREPROGRAMMED SPEEDS 37
- OPTION/TAB key 38
- LOCKOUT OPTIONS 38
- PROG RUN key is pressed 40
- PROG RUN 40
- ENTER key. Assume that the 41
- ENTER key, our display will 41
- PROGRAMMED SPEED STOP 41
- PROGRAMMED SPEED HOLD 42
- SINGLE SPEED 49
- DVIII SPEED/TIME PAIRS 50
- B.E.V.I.S. PROGRAMS 50
- STANDARD CASSON PRINTOUT 51
- 1. Casson (Standard) 52
- 3. Bingham Plastic 52
- 4. Power Law 53
- 5. IPC Paste Analysis 53
- Figure IV-44: Test Screen 55
- Figure IV-45: Run/Data Screen 55
- Figure IV-46: Setup Screen 56
- Figure IV-47: Analysis Screen 56
- Figure IV-48 57
- = shear stress 58
- Figure IV-65 79
- V. OPTIONS 89
- ENTER key 89
- V.4 Set Temperature 91
- V.6 Timed Data Collection 93
- Do Not hit the 96
- CONE with the CUP! 96
- A.3 SETTING THE GAP 97
- Universal Spindle Ranges 99
- Rheometer at 45 RPM 100
- Spindle Speed = 45 RPM 100
- RHEOLOGICAL PROPERTIES 105
- Table D-1 (continued) 108
- (S x T) 112
- +/-) 0.1°C 114
- °C, are shown in Table E-1 114
- Table E-1 115
- °C, 93.3°C, 149°C 115
- Table E-2 115
- + 500) cP = (+/-) 622.57 cP 119
- Figure F-1 121
- DV-III Ultra Stand Assembly 122
- Item Part # Description Qty 122
- 4 hex digits. Calculate the 125
- Zero offset = tval/100 125
- VISCOSITY TEST REPORT 133
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