Brookfield DV-II+ Digital Viscometer User Manual
BROOKFIELD DIGITAL VISCOMETER
MODEL DV-II+
Operating Instructions
Manual No. M/92-161-I496
BROOKFIELD ENGINEERING LABORATORIES, INC.
240 Cushing Street, Stoughton, MA 02072 USA
Phone: 617-344-4310/4313 800-628-8139 (U.S. except MA); Fax: 617-344-7141
Telex: 924497 BRENLAB STOU (Western Union); 200195 BEL (RCA)
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TABLE OF CONTENTS
I. INTRODUCTION ........................................................................... 3
1 DV-II+ Components .......................................................................... 3
2 Utilities .............................................................................................. 4
3 Specifications .................................................................................... 4
4 DV-II+ Set-Up................................................................................... 4
5 Key Functions.................................................................................... 5
II. GETTING STARTED..................................................................... 6
1 Autozero ............................................................................................ 6
2 Spindle Selection ............................................................................... 7
3 Speed Selection & Setting ................................................................. 8
4 Display Selection............................................................................. 10
5 Autorange and CGS or SI Units Selection ...................................... 10
6 Out of Range.................................................................................... 11
7 Temperature Display ....................................................................... 12
8 Printing ............................................................................................ 13
9 Operation ......................................................................................... 14
10 Timed Modes for Viscosity Measurement ...................................... 14
Appendix A - Cone/Plate Viscometer Set-Up....................................... 20
Appendix B - Viscosity Ranges ............................................................ 26
Appendix C - Variables in Viscosity Measurements ............................ 29
Appendix D - Spindle and Model Codes .............................................. 31
Appendix E - Calibration Procedures ................................................... 34
Appendix F - Special Speed Sets.......................................................... 40
Appendix G - Communications............................................................. 41
Appendix H - Model A Laboratory Stand............................................. 45
Appendix I - DVE-50 Probe Clip ........................................................ 47
Appendix J - Fault Diagnosis and Troubleshooting ............................ 48
Appendix K - Warranty Repair and Service ......................................... 51
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I. INTRODUCTION
The Brookfield DV-II+ Viscometer measures fluid viscosity at given shear rates. Viscosity is a
measure of a fluid’s resistance to flow. You will find a detailed description of the mathematics of
viscosity in the Brookfield publication ”More Solutions to Sticky Problems” a copy of which was
included with your DV-II+.
The principal of operation of the DV-II
+ is to drive a spindle (which is immersed in the test fluid)
through a calibrated spring. The viscous drag of the fluid against the spindle is measured by the spring
deflection. Spring deflection is measured with a rotary transducer. The measurement range of a DV-
II+ (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 Brookfield:
Spring Torque
Model dyne-cm milli Newton - m
LVDV-II
RVDV-II
+ 673.7 0.0673
+ 7,187.0 0.7187
HADV-II+ 14,374.0 1.4374
HBDV-II+ 57,496.0 5.7496
The higher the torque calibration, the higher the measurement range. The measurement range for
each torque calibration may be found in Appendix B.
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-II+ Viscometer display.
2. Shear Stress appears in units of dynes/square centimeter (“D/cm2”) or Newtons/square
meter (“N/m2”).
3. Shear Rate appears in units of reciprocal seconds (“1/SEC”).
4. Torque appears in units of dyne-centimeters or Newton-meters (shown as percent “%”
in both cases) on the DV-II+ Viscometer display).
The equivalent units of measurement in the SI system are calculated using the following conversions:
SI CGS
Viscosity: 1 mPa•s = 1 cP
Shear Stress: 1 Newton/m
2
= 10 dyne/cm
2
Torque: 1 Newton-m = 107 dyne-cm
References to viscosity throughout this manual are done in CGS units. The DV-II+ Viscometer
provides equivalent information in SI units.
I.1 Components
1) DV-II+ Viscometer
2) Model A Laboratory Stand
3) Spindle Set with Case (4 spindles for LVDV-II+; 7 Spindles for RV, HA and HBDV-II+).
For Cone/Plate versions: a spindle wrench, one cone spindle and sample cup (Part No. CP44Y) replace the spindle set.
4) Power cord
5) RTD Temperature Probe and DVE-50 Probe Clip
6) Guard Leg (LVDV-II+ and RVDV-II+ only)
7) Carrying Case
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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 Brookfield Engineering or your local Brookfield agent immediately. Any shipping damage must be reported to the carrier.
I.2 Utilities
Input Voltage: 115 VAC or 230 VAC
Input Frequency: 50/60 Hz
Power Consumption: Less than 20 WATTS
Power Cord Color Code:
United States Outside United States
Hot (live) Black Brown
Neutral White Blue
Ground (earth) Green Green/Yellow
I.3 Specifications
Speeds: LVDV-II+: 0.0, 0.3, 0.6, 1.5, 3, 6, 12, 30, 60, 0.0,
0.5, 1, 2, 2.5, 4, 5, 10, 20, 50, 100
RV/HA/HBDV-II+: 0.0, 0.5, 1, 2, 2.5, 4, 5, 10, 20, 50, 100,
0.0, 0.3, 0.6, 1.5, 3, 6, 12, 30, 60
Weight: Gross Weight 20 lbs. 9 kg.
Net Weight 17 lbs. 7.7 kg.
Carton Volume 1.65 cu. ft. 0.05 m
3
Temperature sensing range: -100˚C to 300˚C (-148˚F to 572˚F)
Analog Torque Output: 0 - 1 Volt DC (0 - 100% Torque)
Analog Temperature Output: 0 - 4 Volts DC (10mv / ˚C)
RS232 Compatible Serial Port for use with an attached printer or PC.
I.4 Set-Up
1) Place the upright rod into the base (refer to 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 the jam nut which is attached from the bottom of the base. Tighten this nut with a
suitable wrench (spanner). Attach leveling feet.
2) Insert the mounting handle on the back of the DV-II+ Viscometer into the hole on the clamp
assembly. Be sure that the clamp screw, VS-24Y, is loose.
3) Tighten the VS-24Y clamp screw. Adjust viscometer to be as close to level as possible while
tightening VS-24Y.
4) Connect the RTD probe to the socket on the rear panel of the DV-II+.
5) The Viscometer must be leveled. The level is adjusted using the three leveling screws on
the base. Adjust so that the bubble level on top of the DV-II+ is centered within the circle.
Note: Check level periodically during use.
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6) Make sure that the AC power switch at the rear of the DV-II+ is in the OFF position.
Connect the power cord to the socket on the back panel of the instrument and plug it into
the appropriate AC line. The AC input voltage and frequency must be within the
appropriate range as shown on the name plate of the Viscometer.
Note: The DV-II+ must be earth grounded to ensure against electronic failure!!
7) Temperature monitoring is assured (after the instrument has stabilized) to within ±1.0˚C in
the range -99.9˚C to +150˚C and within ±2.0˚C in the range 150˚C to 300˚C.
8) For Cone/Plate models, refer to Appendix A.
I.5 Key Functions
Figure 1 shows the control keys on the face of
the DV-II+ Viscometer. The following
describes the function of each key.
MOTOR
ON/OFF
AUTO
RANGE
UP ARROW
This key is used to scroll UP (in an increasing
value direction) through the available speed or
spindle tables.
SET
SPEED
SELECT
SPINDLE
DOWN ARROW
This key is used to scroll DOWN (in a decreasing value direction) through the available speed
or spindle tables.
SELECT
DISPLAY
MOTOR ON/OFF
Turns the motor ON or OFF.
Figure 1
SET SPEED
Causes the DV-II+ to begin running at the currently selected speed. This key is used for Time to
Torque and Timed Stop Tests (see Section II.10 - Timed Modes for Viscosity Measurement).
SELECT DISPLAY
Selects the data parameter to be displayed:
% Viscometer Torque (%)
cP Viscosity (cP or mPa.s)
SS Shear Stress (dynes/cm2 or Newtons/m2)
SR Shear Rate (1/sec)
Note: Pressing and holding the Select Display key during power on will enable the
temperature display for units of either °C or °F (see page 12).
AUTO RANGE
Presents the maximum (100% torque) viscosity attainable using the selected spindle at the current
viscometer spindle speed. This feature is functional when the motor is running.
PRINT
Note: Pressing and holding the Auto Range key during power on will enable the
display to be selected for either CGS or SI units of measurement (see page 11).
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SELECT SPINDLE
Initiates spindle selection on the first press and then selects the currently scrolled-to spindle when
pressed a second time. This key is used for Time to Torque and Timed Stop Tests (see Section II.10
- Timed Modes for Viscosity Measurement).
PRINT
Selects printing and non-printing modes when a printer is attached.
II. GETTING STARTED
II.1 Autozero
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:
Turn the power switch (located on the rear panel) to the ON position. This will result in the following
screen display:
BROOKFIELD DVII+
RV VISCOMETER
Figure 2
After a few seconds, the following screen appears:
Figure 3
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 4
After removing the spindle and pressing any key, the DV-II+ begins its Autozero. The screen will
flash "Autozeroing."
After approximately 15 seconds, the display shows “Replace Spindle Press Any Key”.
Figure 5
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Pressing any key at this point results in the display of the DV-II+ default screen:
Figure 6
The display will vary slightly depending upon the status of temperature and last spindle entered.
II.2 Spindle Selection
LVDV-II+ Viscometers are provided with a set of four spindles and a narrow guardleg; RVDV-II+
Viscometers come with a set of seven spindles and a wider guardleg; HADV-II+ and HBDV-II+
Viscometers come with a set of seven spindles and no guardleg. (See Appendix E for more
information on the guardleg.)
The spindles are attached to the viscometer by screwing them to the lower shaft. Note that the
spindles have a left-hand thread. The lower shaft should be held in one hand and the spindle 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 identified by the number on
the side of the spindle coupling nut.
The DV-II+ must have a Spindle Entry Code number to calculate Viscosity, Shear Rate and Shear
Stress values. The DV-II+ memory contains parameters for all standard Brookfield spindles and the
two digit entry code for each spindle (the complete list of entry codes may be found in Appendix D).
Note: The DV-II+ will remember the Spindle Entry Code which was in use when the power was
turned off.
Pressing the SELECT SPINDLE key will cause the character S on the top line of the display to begin
to blink . It will blink for about three seconds. If the 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 (in
either an increasing or decreasing direction depending upon which Arrow key is pressed) for each
press of the key. If the Arrow key is pressed and held, the display will scroll through the spindle codes
for as long as 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 first or last spindle code
and the scroll action will continue.
When the desired spindle code is displayed, release the Arrow key to halt further scrolling. Press
the SELECT SPINDLE key once again. This will cause the S character to cease blinking and the
new 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-II+ 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 Brookfield’s
DVGATHER+ or WINGATHER computer programs. Refer to the DVGATHER+ or
WINGATHER manuals for further information on using “99” spindles.
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The DV-II+ may also be programmed at Brookfield Engineering for “special” user spindles. These
“special” spindles will show up on the spindle scroll list starting with designation “AA” and
continuing through “AZ”. Contact Brookfield Engineering regarding your needs for special
spindles.
II.3 Speed Selection & Setting
There are 18 speeds programmed into the standard DV-II+. These speeds correspond to the standard
LVT, RVT, HAT, HBT, LVF and RVF dial models. If the DV-II
at speed 0.0. It will then scroll up through the LV speeds, pass through speed 0.0 again, and then scroll
up through the RV speeds at which point it will pass through speed 0.0 again and will then repeat the
above sequence. If the DV-II
The DV-II+ will start at 0.0 and scroll through the RV speeds, pass through 0.0 again and then scroll
through the LV speeds until it again reaches speed 0.0. The speed sets are described in Table 1.
+ is an RV (HA and HB) “type”, the inverse of the above will occur.
+ is an LV, the speed set will start
Table 1
DV-II+ Speed Sets
LV Instruments RV/HA/HB Instruments
0.0 0.0
0.3 0.5
0.6 1.0
1.5 2.0
3.0 2.5
6.0 4.0
12.0 5.0
30.0 10.0
60.0 20.0
0.0 50.0
0.5 100.0
1.0 0.0
2.0 0.3
2.5 0.6
4.0 1.5
5.0 3.0
10.0 6.0
20.0 12.0
50.0 30.0
100.0 60.0
The DV-II+ may also be programmed with “special” speed sets. A list of special speed sets is
included in Appendix F. Please consult Brookfield Engineering or your local dealer/distributor for
any special speed requirements not addressed by the standard or special speed sets.
To select a Viscometer speed first 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 7 shows
the DV-II+ had been operating at 6.0 RPM, and the current selected speed is 6.0 RPM.
Figure 7
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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-II
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-
II
+ is currently running. The user may operate at a given speed and pre-set the DV-II+ to the next
desired speed before that speed will be used. For example, if the DV-II+ is currently running at 6.0
RPM and was previously scrolled to 12 RPM, a single press of either Arrow key would result in the
Figure 8 screen display:
Figure 8
Pressing the SET SPEED key would cause the DV-II+ to begin running at 12 RPM.
If the user did not press the SET SPEED key, the DV-II+ would continue to run at its current speed
of 6 RPM. In fact, you may scroll to a new speed (12 RPM in this example) and press the SET SPEED
key at any future time (without further pressing an Arrow key) to immediately cause the DV-II+ to
run at the new speed. Pressing the Arrow key at any time reminds the operator of what was selected
for the next speed.
+ will begin its
If an Arrow key is pressed and held the DV-II+ will scroll up (or down) through the speed table.
When it reaches the last speed in the list (either at the top or bottom of the list) the speed displayed
will ”roll-over” to either the first or last speed in the table and the scroll action will continue.
When the required speed is displayed, release the Arrow key to halt further scrolling. You have
approximately two seconds (before the blinking RPM stops) in which to press the SET SPEED key
to immediately begin rotation at the new speed.
Pressing the MOTOR ON/OFF key stops the Viscometer spindle rotation. Pressing this key sets
the DV-II+ to 0.0 RPM and causes the screen display to change as shown in Figure 9:
Figure 9
Pressing the MOTOR ON/OFF again immediately starts the DV-II+ running at the last scrolledto-speed. If you had been running at 12 RPM, pressed MOTOR ON/OFF and then re-started the
DV-II+ by pressing MOTOR ON/OFF once again, you would again be running at 12 RPM.
However, if while the motor was off you had scrolled to a new speed of 0.5 RPM, pressing the
MOTOR ON/OFF key would start the DV-II+ running at 0.5 RPM.
Note: During both spindle or speed selection and scrolling operations, the DV-II+ will continue
to calculate and display Viscometer data as selected.
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II.4 Display Selection
Viscometric data (%, cP, SS, SR) is displayed on the left side of the top line. You may “step” through
the four display options by pressing the SELECT DISPLAY key. For example, if the DV-II+ were
currently displaying % (Torque) as shown in Figure 10:
Figure 10
The first press of the SELECT DISPLAY key would display viscosity in cP (or mPa.s), see Figure
11:
Figure 11
The next press of the SELECT DISPLAY key would display SS (Shear Stress) in Dynes/Cm2 (or
Newtons/m2).
Figure 12
The next press of the SELECT DISPLAY key would display SR (Shear Rate) in 1/Sec.
Figure 13
One more press of the SELECT DISPLAY key would result in a re-display of the % (Torque)
screen, as shown in Figure 10.
Note: You may step through the display at any time. This will not interrupt any Viscometer
calculations that are in progress.
II.5 Autorange and CGS or SI Units Selection
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 area formerly
displaying temperature display will now display a flashing “%100.0” to indicate this special
condition. This maximum viscosity and flashing %100.0 value will be displayed for as long as the
AUTO RANGE key is depressed. Figure 14 shows the AUTO RANGE function for the situation
where the No. 1 LV spindle is rotating at 60 rpm. The full scale range is 100.0 cP (or 100.0 mPa.s).
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Figure 14
Note: 1. 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).
2. While the Viscometer is in the Auto Range mode, any data sent to an attached printer or
computer reflects the displayed values (i.e. Auto Range values).
Pressing and holding the AUTO RANGE key during power on will enable the selectable 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-II+ will retain the unit selection when the viscometer is turned OFF.
CGS SI
Viscosity cP mPa.s
Shear Stress dyne/cm
Shear Rate sec
-1
2
N/m
sec
2
-1
Torque % %
DV-II+ Viscometers without this function can be updated. Contact Brookfield or your local
Brookfield dealer for this service.
II.6 Out of Range
The DV-II+ gives indications for out of specification or out-of-range operation. When % (Torque)
readings exceed 100.0 % (over-range), the display changes to that shown in Figure 15:
Figure 15
EEEE will also appear when viscosity or shear stress are over range. 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-II+ displays % (Torque), cP (Viscosity) and SS (Shear Stress)
preceded by a “?” as shown in Figure 16:
Figure 16
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Negative % (Torque) will be displayed as shown in Figure 17:
Figure 17
cP (Viscosity) and SS (Shear Stress) values will be displayed as "- - - -" when the % (Torque) is
below zero.
Figure 18 is an example of the printed output of each of the above conditions.
RPM=50 MD=RV SPDL=29 %=51.4 cP=10280 D/CM2=1285 1/SEC=12.5 T=25.5C
Normal Print String
RPM=50 MD=RV SPDL=29 %=EEEE cP=EEEE D/CM2=EEEE 1/SEC=12.5 T=25.5C
Over-Range
?RPM=50 MD=RV SPDL=29 %=5.2 cP=1040 D/CM2=130 1/SEC=12.5 T=25.5C
Under-Range
RPM=50 MD=RV SPDL=29 %=-0.1 cP=---- D/CM2=---- 1/SEC=0.0 T=25.5C
Negative Torque
Figure 18
II.7 Temperature Display
The DV-II+ will display the temperature measured by its RTD temperature probe. Temperature may
be displayed in either ˚C (Centigrade) or ˚F (Fahrenheit) units depending upon the start-up
operations. If the DV-II+ is started normally, the default temperature display will be in ˚C
(Centigrade) units as shown in the Figure 19:
Figure 19
However, if you press and hold the SELECT DISPLAY key while turning on the DV-II+ the
temperature will be displayed in ˚F (Fahrenheit).
If you turn on the DV-II+ with the temperature probe disconnected, or remove the temperature probe
at any point after power-up, the display will indicate “- - - -°C”.
The four “dashes” indicate the absence of the probe. If you were displaying temperature in
Fahrenheit units the C would be displayed as an F.
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TABLE 2
Temperature Accuracies For
Digital Viscometer Model DV-II+
Temperature Range Temperature Accuracy
-100°C to +150°C ±1.0°C
+150°C to +300°C ±2.0°C
II.8 Printing
The DV-II+ will print data to an attached Serial printer. The printer must be attached to the rear panel
SERIAL AND ANALOG output connector. See Appendix G for the connection requirements.
The printer must be configured as follows:
Baud Rate 9600
Data Bits 8
Stop Bits 1
Parity None
Handshake None
Data may be printed in two ways:
1. Pressing the PRINT key once (for less than three (3) seconds) will result in the printing of one
standard print line.
2. If the PRINT key is pressed and held for more than three (3) seconds, the user will be presented
with the following screen:
Figure 20
Here the user is being asked to enter the time interval (in minutes and seconds) between
successive print strings. First, as depicted above the user is asked for the minutes entry and then
by pressing the print key the seconds entry as shown below:
Figure 21
The print interval maximum limits are 99 minutes and 59 seconds.
3. The method for entering the minutes and seconds values is accomplished by using the UP or
DOWN arrow keys. The PRINT key is used to advance from the minutes to seconds entries and
as the exit key after the user has input the seconds value.
Note: The value for minutes or seconds must be other than zero or you will not be able to exit
this mode.
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4. After the final press of the PRINT key, the DV-II+ will immediately begin sending out print
strings at the selected user print rate. To stop continuous printing, the user must press and hold
the PRINT key for three (3) seconds.
5. Only after the user again presses and holds the PRINT key for three (3) seconds will you be asked
for the minute and seconds entries. The previously selected values for time interval will be
retained in EEPROM so as to be available at the next power-up. Thus, if the user wishes to again
print continuously at the previous print interval, you will only have to press the PRINT key three
(3) times; once to accept the minutes entry; once to accept the seconds entry, and once to exit and
begin printing.
Note: On DV-II+ Viscometers with serial number DE27812 or higher, the RS-232 output
is automatically active after Auto Zero is executed.
The RS-232 output MUST be active (printing continuously) when using a computer
and DVGATHER+ software.
II.9 Operation
The following general procedure is used for making viscosity measurements. Brookfield recommends the use of a 600 ml Low Form Griffin type beaker when using LV/RV/HA/HB spindles in
order to obtain data that verifies proper calibration of the DV-II+ Viscometer (see Appendix E).
1. Mount the guardleg on the DV-II+ Viscometer (LV and RV series). Attach the spindle to the
lower shaft. Lift the shaft slightly, holding it firmly 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 fluid's level is at the immersion groove in
the spindle's shaft. With a disc-type spindle, it is sometimes necessary to tilt the instrument
slightly while immersing to avoid trapping air bubbles on its surface. (You may find it more
convenient to immerse the spindle in this fashion before attaching it to the Viscometer.)
3. To make a viscosity measurement, follow the instructions in II.2 and II.3. 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 fluid. For maximum
accuracy, readings below 10% should be avoided.
4. Press the MOTOR ON/OFF key and turn the motor "OFF" when changing a spindle or changing
samples. Remove spindle before cleaning.
5. 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.
II.10 Timed Modes for Viscosity Measurement
The Timed Modes allow the viscometer user to implement Timed Stop and Time to Torque
capabilities with the DV-II+ Viscometer. These features will allow the user to set up the viscometer
(i.e. select spindle and speed) and then record readings for a fixed 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
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continuously during the event. Upon completion, the viscometer will display a screen stating that
the test is complete and will also display the final recorded value for the viscosity in the first case,
and the time in minutes and seconds to reach the torque limit in the second case. Pressing the UP
or DOWN arrow keys will allow alternate data to be examined and pressing any other key (except
the PRINT key) will bring the user back to the default (normal) viscometer display with the motor
OFF. If the user wishes to run another test, repeat the above steps.
II.10.1 Set Up
1. The user must first select the temperature scale in °C or °F and the display unit option: CGS or
SI.
2. The user then selects (via the UP and DOWN arrows) the spindle speed.
Note: If 0.0 RPM is the selected speed setting (the default after executing AUTOZERO) the
timed modes can be executed; however, the results will be meaningless showing no
viscosity values.
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 SET SPEED and SELECT SPINDLE keys simultaneously to enter either
of the timed test modes. Immediately the following screen appears:
Figure 22
6. The user presses either the UP or DOWN arrow key to select the test method of choice and is
immediately presented with the corresponding opening screen.
II.10.2 Timed Stop Implementation
1. After pressing the UP arrow key when in the display of Figure 23, the user is presented with the
following screen:
Figure 23
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.
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2. When satisfied, the user presses the SELECT SPINDLE key again to enter the seconds setting
display:
Figure 24
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.
Note: The value for minutes or seconds must be other than zero or you will not be able to exit
this mode.
The user presses the SELECT SPINDLE key one more time to end his time input at which point
the viscometer will display the following screen:
Figure 25
3. At this point, the user need only press the MOTOR ON/OFF key to begin the timed stop
operation. Any other key will abort the process and the user will have to begin again by
simultaneously pressing the SET SPEED and SELECT SPINDLE keys.
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:
Figure 26
Note:
1. 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.
2. Also see Comments on Print Mode Operation in Section II.10.4 for a description of print
options available on DV-II+ during the Timed Stop run.
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:
Figure 27
- 16 -
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