DV-I Prime
BROOKFIELD DV-I PRIME
Digital Viscometer
Operating Instructions
Manual No. M/07-022-D0613
TABLE OF CONTENTS
I. INTRODUCTION ..................................................................................................5
I.1 Components .................................................................................................................................................6
I.2 Utilities ............................................................................................................................................................7
I.3 Components and Dimensions ...............................................................................................................8
I.4 Specications ............................................................................................................................................ 10
I.5 Setup ............................................................................................................................................................ 11
I.6 Safety Symbols and Precautions ........................................................................................................ 11
I.7 Key Functions ............................................................................................................................................ 12
I.8 Preventative Maintenance and Cleaning ........................................................................................ 13
II. GETTING STARTED ............................................................................................ 14
II.1 Auto Zero .................................................................................................................................................... 14
II.2 Spindle Selection ..................................................................................................................................... 15
II.2.1 Spindle Selection for Models WITHOUT Temperature Display ....................................15
II.2.2 Spindle Section for Models WITH Temperature Display ................................................. 16
II.3 Speed Selection & Setting .................................................................................................................... 17
II.4 Autorange .................................................................................................................................................. 18
II.5 CGS or SI Units Selection ....................................................................................................................... 19
II.6 Temperature Display in °F or °C .......................................................................................................... 19
II.7 Out of Range ............................................................................................................................................. 19
II.8 Operation ................................................................................................................................................... 20
II.9 Timed Modes for Viscosity Measurement ....................................................................................... 21
II.9.1 Set Up ............................................................................................................................................... 21
II.9.2 Timed Stop ...................................................................................................................................... 21
II.9.3 Time to Torque ............................................................................................................................... 23
II.9.4 Temperature Oset ...................................................................................................................... 25
II.10 Print Modes ............................................................................................................................................. 26
II.11 Communication with Wingather Software ................................................................................. 27
II.12 Math Models .......................................................................................................................................... 31
II.12.1 The Power Law (Ostwald) Model .......................................................................................... 31
II.12.2 The Herschel-Bulkley Model .................................................................................................. 32
II.12.3 The Bingham Model ..................................................................................................................34
II.12.4 The Casson Model ......................................................................................................................35
II.12.5 Other Common Rheological Models .................................................................................. 37
III. MAKING VISCOSITY MEASUREMENTS ........................................................... 39
III.1 Quick Start ................................................................................................................................................. 39
III.2 Preparations for Making Measurements ...................................................................................... 39
III.3 Selecting a Spindle/Speed ................................................................................................................. 40
III.4 Multiple Data Points ............................................................................................................................. 40
Appendix A - Cone/Plate Viscometer Set-Up ........................................................................ 42
Appendix B - Viscosity Ranges .................................................................................................... 47
Appendix C - Variables in Viscosity Measurement ............................................................... 51
Appendix D - Spindle and Model Codes ................................................................................. 53
Appendix E - Calibration Check Procedures ........................................................................... 55
Appendix F - The Brookeld Guardleg ..................................................................................... 62
Appendix G - Communications .................................................................................................. 64
Appendix H - Laboratory Stands with Parts Identication ............................................... 65
Appendix I - DVE-50A Probe Clip ............................................................................................... 67
Appendix J - Fault Diagnosis and Troubleshooting ............................................................. 68
Appendix K - Online Help and Additional Resources ......................................................... 69
Appendix L - Warranty Repair and Service ............................................................................. 70
Appendix M - Viscosity Test Report ........................................................................ 71(tear out page)
Brookeld Engineering Laboratories, Inc. Page 4 Manual No. M/07-022-D0613
I. INTRODUCTION
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The Brookeld DV-I PRIME Viscometer measures uid viscosity at given shear rate. Viscosity
is a measure of a uid’s resistance to ow. You will nd a detailed description of the science of
viscosity in the Brookeld publication “More Solutions to Sticky Problems”, a copy of which
was included with your DV-I PRIME.
The principle of operation of the DV-I PRIME is to drive a spindle (which is immersed in the test
uid) through a calibrated spring. The viscous drag of the uid against the spindle is measured by
the spring deection. Spring deection is measured with a rotary transducer. This system provides
continuous sensing and display of the measurement during the entire test. The measurement range
of a DV-I PRIME (in centipoise or milliPascal-seconds) is determined by the rotational speed
of the spindle, the size and shape of the spindle, the container the spindle is rotating in, and the
full-scale torque of the calibrated spring.
There are four basic spring torque series offered by Brookeld:
Spring Torque
Model dyne-cm milli Newton-m
LVDV-I
RVDV-I
HADV-I
HBDV-I
PRIME 673.7 0.0673
PRIME 7,187.0 0.7187
PRIME 14,374.0 1.4374
PRIME 57,496.0 5.7496
The higher the torque calibration, the higher the measurement range. The viscosity measurement
range for each torque calibration may be found in Appendix B.
Spring torque decals, on peel-off labels, are being supplied with your instrument. Please select
the appropriate decal and attach to the viscometer.
The DV-I PRIME is available with a built-in temperature probe option, which allows temperature
readout over the range -100ºC to +300ºC (-148ºF to + 572ºF). This option allows ambient
temperature measurement or temperature measurement of the sample during viscosity testing.
Contact Brookeld or your local Brookeld agent for more information on this instrument option.
All units of measurement are displayed according to either the CGS system or the SI system.
1. Viscosity appears in units of centipoise (shown as “cP”) or milliPascal-seconds (shown
as mPa•s) on the DV-I PRIME Viscometer display.
2. Torque appears in units of dyne-centimeters or Newton-meters (shown as percent “%”)
in both cases) on the DV-I PRIME Viscometer display.
3. Temperature appears in units of Celsius (shown as C) or Fahrenheit ( shown as F) on the
DV-I PRIME Viscometer display.
The following applies to DV-I PRIME Viscometers with the temperature probe option. Look for
the symbol
Viscometers with temperature probe option.
throughout this manual for instructions pertaining specically to DV-I PRIME
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The equivalent units of measurement in the SI system are calculated using the following
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conversions:
SI CGS
Viscosity: 1 mPa•s = 1 cP
7
Torque: 1 Newton-m = 10
dyne-cm
References to viscosity throughout this manual are done in CGS units. The DV-I PRIME
Viscometer provides equivalent information in SI units.
I.1 Components
Component Part Number Quantity
DV-I PRIME varies 1
Model G Laboratory Stand Model G 1
Spindle Set with Case* varies 1
LVDV-I PRIME set of four spindles (#61 through #64) (SSL)
RVDV-I PRIME set of six spindles (#02 through #07) (SSR)
HA/HBDV-I PRIME set of six spindles (#02 through #07) (SSH)
Shipping Cap* B-30-3Y 1
Power Cord (115V/230V) DVP-65/66 1
Guardleg* (not supplied with HA/HB versions) varies 1
LVDV-I PRIME B-20Y
RVDV-I PRIME B-21Y
Carrying Case DVE-106 1
Operating Manual M07-022 1
Torque Decals T05-1012 1
For cone/plate versions
Spindle wrench CP-23 1
Cone spindle CPE-XX 1
Sample cup varies 1
Standard CPE-44Y
With embedded temperature probe and cable CPE-44PY
The following applies to DV-I PRIME Viscometers with the temperature probe option. Look for
the symbol
throughout this manual for instructions pertaining specically to DV-I PRIME
Viscometers with temperature probe option.
OPTIONAL ITEMS
RTD Temperature Probe DVP-94Y 1
Probe Clip DVE-50A 1
RTD Cable when supplied with Cone/Plate version SC4-61Y 1
Please check to be sure that you have received all components and that there is no damage. If
you are missing any parts, please notify Brookeld Engineering or your local Brookeld agent
immediately. Any shipping damage must be reported to the carrier.
* Not supplied with Cone/Plate version.
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I.2 Utilities
Input Voltage: 115 VAC or 230 VAC
Input Frequency: 50/60 Hz
Power Consumption: 22 WATTS
Power Cord Color Code:
United States Outside United States
United States
Outside United States
Hot (live) Black Brown
Neutral White Blue
Ground (earth) Green Green/Yellow
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I.3 Components and Dimensions
:
use in beake
:
Shipping
Cap
LV Guard
Leg
DV-I Prime Viscometer
Model G Laboratory Stand
Spindle Set
Cone/Plate Option
Temperature Probe Option
• For use with SSA or C/P
Wrench
Temperature Cable
SC4-61Y
• For
Cone Spindle
Sample Cup
r
Temperature Probe Clip
Temperature Probe
Figure I-1
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Figure I-2
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I.4 Specications
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Speeds: 0.0, 0.3, 0.6, 1.5, 3, 6, 12, 30, 60,
(rpm) 0.5, 1, 2, 2.5, 4, 5, 10, 20, 50, 100
Weight: Gross Weight 20 lb 9 kg
Net Weight 17 lb 7.7 kg
Carton Volume 1.65 cu ft 0.05 m
3
Operating Environment: 0°C to 40°C Temperature Range (32°F to 104°F)
20% - 80% R.H.: non-condensing atmosphere
Analog Torque Output: 0 - 1 Volt DC (0 - 100% Torque)
Viscosity Accuracy: ±1% Full Scale Range in Use (See Appendix D for range
calculation)
Viscosity Repeatability: 0.2% of Full Scale Range in Use
Temperature Sensing Range: -100°C to +300°C (-148°F to +572°F)
Temperature Accuracy: ±1°C: -100°C to +149°C
±2°C: +150°C to +300°C
Analog Temperature Output: 0-4 Volt DC (10 mV/°C)
Electrical Certications:
Conforms to CE Standards:
BSEN 61326: Electrical equipment for measurement, control and laboratory use - EMC
requirements
BSEN 61010-1: Safety requirements for electrical equipment, for measurement, control
and laboratory use
Notice to customers:
This symbol indicates that this product is to be recycled at an appropriate collection center.
Users within the European Union:
Please contact your dealer or the local authorities in charge of waste management on how to
dispose of this product properly. All Brookeld ofces and our network of representatives and
dealers can be found on our website: www.brookeldengineering.com
Users outside of the European Union:
Please dispose of this product according to your local laws.
Brookeld Engineering Laboratories, Inc. Page 10 Manual No. M/07-022-D0613
I.5 Setup
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1. To assemble the Model S Laboratory Stand, place the upright rod into the base (refer to
2. Be sure that the clamp screw, VS-41Y, is loose. Insert the mounting rod on the back of
3. Tighten the VS-41Y clamp screw. Adjust the Viscometer to be as close to level as possible
assembly instructions in Appendix H). The rack gear and clamp assembly should face
the front of the base. The upright rod is held in place with a screw, which is attached from
the bottom of the base. Tighten this screw with a screwdriver.
the DV-I PRIME Viscometer into the hole on the clamp assembly.
while tightening the clamp screw.
4. Connect the optional RTD temperature probe to the temperature port
panel of the DV-I PRIME, if provided.
5. The Viscometer must be level. The level is adjusted using the two Leveling Screws (VS-3)
on the base. Adjust so that the bubble level on top of the DV-I PRIME is centered within
the circle. Check level periodically during use.
6. Remove Shipping Cap
7. Make sure that the AC power switch at the rear of the DV-I
Connect the power cord to the socket on the back panel of the instrument and plug it into
the appropriate AC line.
8. For Cone/Plate models, refer to Appendix A.
I.6 Safety Symbols and Precautions
Safety Symbols
The following explains safety symbols, which may be found in this operating manual.
The AC input voltage and frequency must be within the appropriate range as
shown on the nameplate of the viscometer. The DV-I
grounded to ensure against electronic failure!
PRIME is in the OFF position.
PRIME must be earth
on the rear
Precautions
The user should ensure that the substances placed under test do not release poisonous,
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Indicates hazardous voltages may be present.
Refer to the manual for specic warning or caution information to avoid personal injury
or damage to the instrument.
If this instrument is used in a manner not specied by the manufacturer, the protection
provided by the instrument may be impaired.
This instrument is not intended for use in a potentially hazardous environment.
In case of emergency, turn off the instrument and then disconnect the electrical cord
from the wall outlet.
toxic or ammable gases at the temperatures to which they are subjected to during the
testing.
I.7 Key Functions
Figure I-3 shows the control keys on the face of the DV-I PRIME
Viscometer. The following describes each key’s function.
UP ARROW
This key is used to scroll UP (in an increasing value
direction) through the available speed or spindle tables.
DOWN ARROW
This key is used to scroll DOWN (in a decreasing value
direction) through the available speed or spindle tables.
TpNote: Pressing and holding the DOWN ARROW
key during the POWER ON will change the
temperature display between °C and °F.
MOTOR
ON/OFF
MOTOR ON/OFF
Turns the motor ON or OFF.
Figure I-3
Causes the DV-I
SET SPEED
PRIME to begin running at the currently selected speed. Used for Time to
Torque and Timed Stop tests. (see Section II.9 - Timed Modes for Viscosity Measurement.)
AUTO RANGE/ENTER
Auto range presents the maximum (100% torque) viscosity attainable (known as Full Scale
Range) for the spindle/speed selected. This feature is functional when the motor is running.
Viscometer accuracy is 1% of the maximum (100% torque) viscosity value; minimum
recommended viscosity range is 10% of the maximum viscosity value.
Note: Pressing and holding the AUTO RANGE key during power on will enable the
viscosity display to be changed between CGS and SI units (see Section II.5).
ENTER Use to enter parameters in the Timed Stop Mode(see Section II.9.2).
TIMED OPTION
Used to select timed modes for viscosity measurement (see Section II.9), and to select temperature
offset mode (see Section II.9.4).
SELECT SPINDLE
This initiates spindle selection on the rst press and then selects the currently scrolled-to
spindle when pressed a second time. Used for Time to Torque and Timed Stop tests (see
Section II.9 - Timed Modes for Viscosity Measurement).
PRINT
Initiates print modes (see Section II.10.)
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I.8 Preventative Maintenance and Cleaning
Make sure the instrument is in a decent working environment (dust-free, moderate
temperature, low humidity, etc.)
Make sure the instrument is on a level surface.
Hands/ngers must be clean and free of residual sample. Not doing so may result in
deposit build up on the upper part of the shaft and cause interference between the
shaft and the pivot cup.
Be sure to remove spindle from the instrument prior to cleaning. Note left-hand
thread. Severe instrument damage may result if spindle is cleaned in place.
Instrument and Keypad: Clean with dry, non-abrasive cloth. Do not use solvents or cleaners.
Immersed Components: Spindles and guard leg are made of stainless steel. Clean with
non-abrasive cloth and solvent appropriate for sample material
that is not aggressive to immersed components.
When cleaning, do not apply excessive force, which may result in bending spindles.
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II. GETTING STARTED
II.1 Auto Zero
Before readings may be taken, the Viscometer must be Autozeroed. This action is performed
each time the power switch is turned on. The display window on the Viscometer will guide you
through the procedure as follows:
NOTE: Check instrument level before proceeding - see Section I.5.
Turn the power switch (located on the rear panel) to the ON position. This will result in the
following screen display:
BROOKFIELD DV-I
PRIME VISCOMETER
Figure II-1
After a few seconds, the following screen appears:
BROOKFIELD DV-I
Instrument Torque
RV V6.0
Firmware Version
Figure II-2
No key press is required at this point. After a short time, the display will clear and the following
will be displayed:
REMOVE SPINDLE
PRESS ANY KEY
Figure II-3
After removing the spindle and pressing a key, the DV -I PRIME begins its Autozero. The screen
will ash “Autozeroing Viscometer”.
AUTOZEROING
VISCOMETER
Figure II-4
NOTE: Be sure that the viscometer is level before initiating Autozero.
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After approximately 15 seconds, the ashing stops and the following screen appears:
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REPLACE SPINDLE
PRESS ANY KEY
Figure II-5
Pressing a key at this point results in the display of the DV-I PRIME default screen:
Calculated Viscosity
Speed
cP 0.0 S01
OFFRPM % 0.0
Spindle Selected
% Torque
(without Temperature Probe)
Figure II-6a
cP 0.0 70.1°F
Temperature
OFFRPM % 0.0
(with Temperature Probe)
Figure II-6b
The display will vary slightly depending upon the status of the last spindle entry.
II.2 Spindle Selection
LVDV-I PRIME Viscometers are provided with a set of four spindles and a narrow guardleg;
RVDV-I PRIME Viscometers come with a set of six spindles and a wider guardleg; HADV-I
PRIME and HBDV-I PRIME Viscometers come with a set of six spindles and no guardleg (see
Appendix F for more information on the guardleg.)
The spindles are attached to the viscometer by screwing them on to the lower shaft. Note that the
spindles have a left-hand thread. The lower shaft should be held in one hand and lifted up. The
spindles should be screwed to the left. The face of the spindle nut and the matching surface on
the lower shaft should be smooth and clean to prevent eccentric rotation of the spindle. Spindles
can be identied by the number on the side of the spindle nut.
The DV-I PRIME requires a Spindle Entry Code number to calculate viscosity values. The
two-digit entry code for each spindle can be found in Appendix D.
NOTE: The DV-I PRIME will remember the Spindle Entry Code that was in use when the
power was turned off.
II.2.1 Spindle Selection for Models WITHOUT Temperature Display
Pressing the
to blink. It will blink for about three seconds. If the
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SELECT SPINDLE key will cause the characters on the top line of the display to begin
UP or DOWN ARROW keys are pressed (while
S is blinking) the two character spindle value to the right of the S character will begin to change
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(in either an increasing or decreasing direction depending upon which
each press of the key. If the
spindle codes for as long as the
ARROW key is pressed and held, the display will scroll through the
ARROW key is depressed. When it reaches the last item in the list
(either at the top or bottom of the list) the spindle code displayed will “roll-over” to either the
rst or last spindle code and the scroll action will continue.
ARROW key is pressed) for
When the desired spindle code is displayed, release the
SELECT SPINDLE key once again. This will cause the S character to cease blinking and the new
the
ARROW key to halt further scrolling. Press
spindle code will be accepted for use in viscometer calculations.
NOTE: You have approximately three seconds in which to press the SELECT SPINDLE
key before the blinking stops. If you fail to press the SELECT SPINDLE key
before the blinking stops you will have to repeat the above steps and re-select the
desired spindle.
The DV-I PRIME will begin to calculate using the new spindle parameters as soon as the SELECT
SPINDLE key is pressed the second time.
NOTE: The number 99 spindle is for use with special spindles when using Brookeld’s
WINGATHER32 computer program. Refer to WINGATHER32 operator manual
for further information on using “99” spindles.
DV-I PRIME remembers last spindle selected when power is shut down.
II.2.2 Spindle Section for Models WITH Temperature Display
The steps for selecting and accepting a spindle entry are the same as Section II.2.1 except that
when SELECT SPINDLE is depressed, the temperature display is temporarily replaced by the spindle
entry code until the entry code is accepted (Figure II-7):
cP 123.4 S31
10 RPM % 89.7
Figure II-7
Once the spindle entry code is accepted, the screen will return to the default display:
cP 123.4 70.1°F
10 RPM % 89.7
Figure II-8
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II.3 Speed Selection & Setting
Table II-1 shows the available speed selections.
DV-I PRIME SPEEDS SETS
Beginning 0.0
When scrolling 0.6
“UP” 1.5
0.3
3.0
6.0
12
30
60
0.0
0.5
1.0
2.0
2.5
4.0
5.0
10
20
50
100
Table II-1
NOTE: DV-I PRIME speeds are organized to conform to the historical speed sets available on
the Brookeld Dial Reading viscometer. Speeds from 0.3-60 RPM are traditionally
found on the LVT viscometer. Speeds from 0.5-100 RPM are traditionally found
on RVT, HAT, and HBT viscometers.
To select a viscometer speed rst press either the UP or DOWN ARROW keys which will cause the
area to the right of RPM (on the bottom line) to display the currently selected speed. Figure II-9
shows the DV-I PRIME had been operating at 10 RPM, and the current selected speed is 10 RPM.
cP 872.0 S01
10RPM10 % 87.2
“Selectable” Speed Operating Speed
Figure II-9
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If the ARROW key is pressed just once and then released, the characters RPM will blink for three
seconds, then will cease blinking resulting in no change to the speed entry.
NOTE: The speed selection process remembers the last value of scrolled-to speed so that
the next time you initiate a speed change (by pressing an
ARROW key), the DV-I
PRIME will begin its scroll display from the last entered value.
The last scrolled-to-speed does not necessarily have to be the same as the speed at which the
DV-I PRIME is currently running. The user may operate at a given speed and pre-set the DV-I
PRIME to the next desired speed before that speed will be used. For example, if the DV-I PRIME
is currently running at 10 RPM and was previously scrolled to 20 RPM, a single press of either
ARROW key would result in the Figure II-10 screen display:
cP 872.0 S01
10 RPM20 % 87.2
Scrolled to Selected Speed Operating Speed
Figure II-10
Pressing the
If motor is off, pressing the
the last scrolled-to-speed. If you had been running at 10 RPM, pressed
re-started the DV-I PRIME by pressing
SET SPEED key would cause the DV-I PRIME to begin running at 20 RPM.
MOTOR ON/OFF key immediately starts the DV-I PRIME running at
MOTOR ON/OFF and then
MOTOR ON/OFF once again, you would again be running
at 10 RPM. However, if while the motor was off you had scrolled to a new speed of 20 RPM,
pressing the
MOTOR ON/OFF key would start the DV-I PRIME running at 20 RPM.
DV-I PRIME remembers last speed selected when power is shut down.
NOTE: During both spindle or speed selection and scrolling operations, the DV-I PRIME
will continue to calculate and display viscosity (cP) and torque (%).
II.4 Autorange
The AUTO RANGE key allows you to determine the maximum calculated viscosity (full scale reading)
possible with the current spindle/speed setting. Pressing the key at any time will cause the current
viscosity display to change and show that maximum viscosity. The screen torque display will
now display a ashing “%100.0” to indicate this special condition. This maximum viscosity and
ashing %100.0 value will be displayed for as long as the
II-11 shows the
AUTO RANGE function for the situation where the No. 3 RV spindle is rotating at
20 RPM. The Full Scale Range is 5000 cP (or 5000 mPa
AUTO RANGE key is depressed. Figure
.
s).
cP 5000 S03
20 RPM %100.0
Figure II-11
Brookeld Engineering Laboratories, Inc. Page 18 Manual No. M/07-022-D0613
NOTE: If the motor is off or the RPM is 0.0, the maximum viscosity displayed will be 0.0
.
cP (or 0.0 mPa
s).
II.5 CGS or SI Units Selection
Pressing and holding the AUTO RANGE key during power on will enable the viscosity display to
be read in either CGS or SI units. To change the unit format:
1. Turn the power off.
2. Press and hold the
AUTO RANGE key and turn the power ON.
The DV-I PRIME will retain the unit selection when the viscometer is turned OFF.
CGS SI
Viscosity cP mPa
•s
II.6 Temperature Display in °F or °C
Pressing and holding the DOWN ARROW key during power on will enable the temperature display
to be read in either degrees Fahrenheit or degrees Centigrade. To change the units format:
1. Turn the power OFF.
2. Press and hold the
DOWN ARROW key and turn power ON.
The DV-I PRIME will retain the unit selection when the viscometer is turned OFF.
Figure II-12 depicts the changes to the default screen when displaying temperature in the Fahrenheit
scale and viscosity display in SI units:
mPas123.4 70.1°F
10 RPM % 89.7
Figure II-12
II.7 Out of Range
Brookeld recommends taking viscosity readings between 10% and 100% of scale. The DV-I
PRIME gives indications for out of specication or out-of-range operation. When % (Torque)
readings exceed 100.0 % (over-range), the display changes to that shown in Figure II-13:
cP EEEE S01
10 RPM % EEEE
Figure II-13
You must change either speed or spindle to correct this condition. If you operate at spindle speeds
that produce % (Torque) below 10.0 % (under-range), the DV -I PRIME ashes both % (Torque)
and cP (Viscosity) on and off:
Brookeld Engineering Laboratories, Inc. Page 19 Manual No. M/07-022-D0613
cP 78.0 S01
10 RPM20 % 7.8
Figure II-14
Negative % (Torque) will be displayed as shown in Figure II-15:
cP ---- S01
10 RPM20 % -0.2
Figure II-15
Viscosity values will be displayed as “- - - -” when the % (Torque) is below zero.
II.8 Operation
The following procedure is outlined for making a viscosity measurement in a 600 mL low form
Grifn beaker.
1. Mount the guardleg on the DV-I PRIME Viscometer (LV and RV series). Attach the spindle
to the lower shaft. Lift the shaft slightly, holding it rmly with one hand while screwing
the spindle on with the other (note left-hand thread). Avoid putting side thrust on the shaft.
2. Insert and center spindle in the test material until the uid’s level is at the immersion
groove in the spindle’s shaft. With a disc-type spindle, it is sometimes necessary to tilt
the spindle slightly while immersing to avoid trapping air bubbles on its surface. You
may nd it more convenient to immerse the spindle in this fashion before attaching
it to the Viscometer.
3. To make a viscosity measurement, select the desired speed setting. Allow time for the
indicated reading to stabilize. The time required for stabilization will depend on the
speed at which the Viscometer is running and the characteristics of the sample uid. For
maximum accuracy, readings below 10% should be avoided. Additional information on
making viscosity measurements is available in Appendix C or the Brookeld publication
“More Solutions to Sticky Problems”.
4. Record the reading and relevant test parameters. Brookeld recommends you record both
% torque and viscosity in centipoise. Relevant test parameters might include: viscometer
model, spindle, speed, temperature, container and time of test.
5. Press the
MOTOR ON/OFF key to turn the motor “OFF” when changing a spindle or changing
samples. Remove spindle and guardleg before cleaning. Clean spindles and guardleg after
use, see Section I.8 for general cleaning recommendations.
6. Interpretation of results and the instrument’s use with non-Newtonian and thixotropic
materials is discussed in the booklet, “More Solutions to Sticky Problems”, and in
Appendix C: Variables in Viscosity Measurements.
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II.9 Timed Modes for Viscosity Measurement
The Timed Modes allow the viscometer user to implement Timed Stop and Time to Torque
capabilities with the DV-I PRIME Viscometer. This feature will allow the user to set up the
viscometer (i.e. select spindle and speed) and then record readings for a xed period of time
(Timed Stop) or until a set torque value is attained (Time to Torque). A series of menus will ask
the user to input minutes and seconds (Timed Stop) or % torque (Time to Torque) and will then
begin timing when the user presses the
MOTOR ON/OFF key to ON. A message will be displayed
showing time remaining (or time elapsed) and the appropriate display item (viscosity or torque)
will be updated continuously during the event. Upon completion, the viscometer will display a
screen stating that the test is complete and will also display the nal recorded value for the viscosity
in the rst case, and the time in minutes and seconds to reach the torque limit in the second case.
II.9.1 Set Up
1. The user must pre-select the display unit option: CGS or SI (see Section II.5).
2. The user then selects (via the
NOTE: If 0.0 RPM is the selected speed setting (the default after executing
3. Next, the user selects the spindle number corresponding to the spindle attached.
4. Now, the user presses the MOTOR ON/OFF key to ensure that the motor is OFF. Setting
the motor to the OFF condition sets up the viscometer for executing the Timed Modes.
5. The user presses the TIMED OPTION key to enter either of the timed test modes. Immediately,
the following screen appears:
The user presses either the
will be ashing.
UP and DOWN arrows) the spindle speed (see Section II.3).
AUTOZERO) the timed modes can be executed; however, the results will
be meaningless showing no viscosity values.
TIMED STOP
TIME TO TORQUE
Figure II-16
UP or DOWN ARROW key to select the test method of choice, which
II.9.2 Timed Stop
1. After pressing the ENTER key when in the display of Figure II-16, the user is presented
with the following screen:
TIMED STOP
SET MIN’S:00
Figure II-17
Brookeld Engineering Laboratories, Inc. Page 21 Manual No. M/07-022-D0613
Using the UP and DOWN ARROW keys, the user enters a value for the minutes portion of
the time to stop. This value can be as high as 99 minutes.
2. When satised, the user presses the ENTER key again to enter the seconds setting display:
TIMED STOP
SET SEC’S:00
Figure II-18
Using the
UP and DOWN ARROW keys, the user enters a value for the seconds portion of the time
to stop. This value will be between 0 and 59 seconds.
The user presses the
ENTER key one more time at which point the viscometer will display the
following screen:
TIMED STOP:PRESS
MOTOR ON/OFF
Figure II-19
3. At this point, the user need only press the
MOTOR ON/OFF key to begin the timed stop
operation.
4. We will assume that the user pressed the MOTOR ON/OFF key to ON and is now presented
with the following screen for the duration of the timed run:
CP 123456789
MIN: 15 SEC: 13
Figure II-20
NOTE: When this mode has begun, a press of the MOTOR ON/OFF key will
interrupt the Timed Stop sequence and return the user to normal operation.
The seconds display will decrement from 59 to zero (0) in one (1) second intervals. When
seconds reaches zero (0), the minutes value will decrement by one (1) minute. This will
continue until all of the time has elapsed at which point the viscometer will display the
following screen:
cP 123456789
TIMED STOP DONE
Figure II-21
At this point, the viscometer will stop the motor and continue to display this screen until
the user presses the
UP or DOWN ARROW keys to view the Torque and Speed that were
current at the Timed Stop completion. This display would appear as follows:
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