Brookfield DV-II+ Manuale utente

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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)

Advanced Test Equipment Rentals

www.atecorp.com 800-404-ATEC (2832)

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TABLE OF CONTENTS

I. INTRODUCTION ........................................................................... 3

1DV-II+ Components .......................................................................... 3

2Utilities .............................................................................................. 4

3Specifications .................................................................................... 4

4DV-II+ Set-Up................................................................................... 4

5Key Functions.................................................................................... 5

II. GETTING STARTED..................................................................... 6

1Autozero ............................................................................................ 6

2Spindle Selection ............................................................................... 7

3Speed Selection & Setting ................................................................. 8

4Display Selection............................................................................. 10

5Autorange and CGS or SI Units Selection ...................................... 10

6Out of Range.................................................................................... 11

7Temperature Display ....................................................................... 12

8Printing ............................................................................................ 13

9Operation ......................................................................................... 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)

throughacalibratedspring. Theviscousdragofthefluidagainstthespindleismeasuredbythespring

deflection. Springdeflectionismeasuredwitharotarytransducer. ThemeasurementrangeofaDV-

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+673.7 0.0673

RVDV-II+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).

TheequivalentunitsofmeasurementintheSIsystemarecalculatedusingthefollowingconversions:

SI CGS

Viscosity: 1 mPa•s = 1 cP

Shear Stress: 1 Newton/m2= 10 dyne/cm2

Torque: 1 Newton-m = 107dyne-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. CP-

44Y) 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 immedi-

ately. 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 m3

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) Placetheuprightrodintothebase(refertoassemblyinstructionsinAppendixH). Therack

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) InsertthemountinghandleonthebackoftheDV-II+Viscometerintotheholeontheclamp

assembly. Be sure that the clamp screw, VS-24Y, is loose.

3) TightentheVS-24Yclampscrew. Adjustviscometertobeasclosetolevelaspossiblewhile

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 isassured (after the instrument has stabilized) to within ±1.0˚Cin

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.

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 decreas-

ing value direction) through the available speed

or spindle tables.

MOTOR ON/OFF

Turns the motor ON or OFF.

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 °Cor °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.

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).

SET

SPEED

MOTOR

ON/OFF AUTO

RANGE

SELECT

SPINDLE

SELECT

DISPLAY

Figure 1

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SELECT SPINDLE

Initiates spindle selection on the first press and then selects the currently scrolled-to spindle when

pressedasecondtime. ThiskeyisusedforTimetoTorqueandTimedStopTests(seeSectionII.10

- Timed Modes for Viscosity Measurement).

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:

Turnthepowerswitch(locatedontherearpanel)totheONposition. Thiswillresultinthefollowing

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

spindleshavealeft-handthread. Thelowershaftshouldbeheldinonehandandthespindlescrewed

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

Stressvalues. TheDV-II+memorycontainsparametersforallstandardBrookfieldspindlesandthe

twodigitentrycodefor eachspindle(thecompletelist ofentrycodesmaybe foundinAppendixD).

Note: TheDV-II+willremember theSpindleEntryCode whichwasin usewhenthe powerwas

turned off.

PressingtheSELECTSPINDLEkeywillcausethecharacterSonthetoplineofthedisplaytobegin

to blink . It will blink for about three seconds. If the UP or DOWN Arrow keys are pressed (while

Sis blinking) the two character spindle value to the right of the Scharacter will begin to change (in

either an increasing or decreasing direction depending upon which Arrow key is pressed) for each

pressofthekey. IftheArrowkeyispressedandheld,thedisplaywillscrollthroughthespindlecodes

for as long as the Arrow key is depressed. When it reaches the last item in the list (either at the top

orbottomofthelist)thespindlecodedisplayedwill“roll-over”toeitherthefirstorlastspindlecode

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 Scharacter 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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TheDV-II+mayalsobeprogrammedatBrookfieldEngineeringfor“special”userspindles. 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

Thereare18speedsprogrammedintothestandardDV-II+. Thesespeedscorrespondtothestandard

LVT,RVT,HAT,HBT,LVFandRVFdialmodels. IftheDV-II+isanLV,thespeedsetwillstart

atspeed0.0. ItwillthenscrollupthroughtheLVspeeds,passthroughspeed0.0again,andthenscroll

upthrough theRVspeedsat which pointit willpass throughspeed 0.0 againand willthen repeat the

above sequence. If the DV-II+is an RV (HA and HB) “type”, the inverse of the above will occur.

TheDV-II+willstartat 0.0andscrollthroughthe RVspeeds,passthrough0.0again andthenscroll

through the LV speeds until it again reaches speed 0.0. The speed sets are described in Table 1.

The DV-II+may also be programmed with “special” speed sets. A list of special speed sets is

includedinAppendixF. PleaseconsultBrookfieldEngineeringoryourlocaldealer/distributorfor

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

areatotherightofRPM(onthebottomline)todisplaythecurrentlyselectedspeed. Figure7 shows

the DV-II+had been operating at 6.0 RPM, and the current selected speed is 6.0 RPM.

Figure 7

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

LV Instruments RV/HA/HB Instruments

DV-II+ Speed Sets

Table 1

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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+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-

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 Arrowkey 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 SETSPEED key, the DV-II+would continue to run at its current speed

of6RPM. Infact,youmayscrolltoanewspeed(12RPMinthisexample)andpresstheSETSPEED

key at any future time (without further pressing an Arrow key) to immediately cause the DV-II+to

runat the newspeed. Pressing the Arrowkey at any timereminds the operator ofwhat was selected

for the next speed.

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

approximatelytwoseconds(before theblinking RPMstops)in whichtopressthe SETSPEEDkey

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 scrolled-

to-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

Viscometricdata(%,cP,SS,SR)isdisplayedontheleftsideofthetopline. Youmay“step”through

thefourdisplayoptions bypressingthe SELECTDISPLAYkey. Forexample, iftheDV-II+were

currently displaying % (Torque) as shown in Figure 10:

Figure 10

Thefirstpressofthe SELECTDISPLAYkeywoulddisplayviscosityincP(ormPa.s), seeFigure

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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