Brookfield DV-II+ Operating Instructions Manual
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Brookfield DV-II+ Operating Instructions Manual

Brookfield DV-II+ Operating Instructions Manual

Digital viscometer
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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)
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  • Page 1 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) - 1 -...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS INTRODUCTION ................3 DV-II+ Components ................3 Utilities ....................4 Specifications ..................4 DV-II+ Set-Up ................... 4 Key Functions ..................5 GETTING STARTED ..............6 Autozero .................... 6 Spindle Selection ................7 Speed Selection & Setting ..............8 Display Selection ................

  • Page 3: Introduction

    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...

  • Page 4: Utilities

    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.

  • Page 5: Key Functions

    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.

  • Page 6: Getting Started

    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+ VISCOMETER Figure 2 After a few seconds, the following screen appears: Figure 3 No key press is required at this point.

  • Page 7: Spindle Selection

    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 WINGATHER manuals for further information on using “99”...

  • Page 8: Speed Selection & Setting

    “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.
  • Page 9 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.

  • Page 10: Display Selection

    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 .

  • Page 11: Out Of Range

    Shear Stress sec -1 sec -1 Shear Rate 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:...

  • Page 12: Temperature Display

    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...

  • Page 13: Printing

    TABLE 2 Temperature Accuracies For Digital Viscometer Model DV-II+ Temperature Range Temperature Accuracy ±1.0°C -100°C to +150°C ±2.0°C +150°C to +300°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.

  • Page 14: Operation

    II.9 Operation The following general procedure is used for making viscosity measurements. Brookfield recom- mends 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).
  • Page 15 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.
  • Page 16 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.
  • Page 17 At this point, the viscometer will stop the motor and continue to display this screen until any key except the UP or DOWN arrow key or the PRINT key is pressed. 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: Figure 28 The display will switch between that of Figures 27 and 28 for each press of either the UP or...
  • Page 18 3. At this point, the user need only press the MOTOR ON/OFF key to begin the timed torque operation. Any other key will abort the process and he will have to begin again by simultaneously pressing the SET SPEED and SELECT SPINDLE keys. 4.
  • Page 19 When the user returns to stand-alone operation with a printer, you will remove the Brookfield PC cable (with the high-speed jumper) and replace it with the Brookfield Printer Cable (Part No. DVP-81) or any standard serial printer cable which will re-enable the print modes described above.

  • Page 20: Appendix A - Cone/Plate Viscometer Set-Up

    APPENDIX A - Cone/Plate Viscometer Set-Up The Cone/Plate version of the DV-II Viscometer uses the same operating instruction procedures as described in this manual. However, the gap between the cone and the plate must be mechanically adjusted before measurements are made. This is done by moving the plate (built into the sample cup, CP-44Y) up towards the cone until two small pins (one in the cone, the second mounted on the plate) contact, and then separating (lowering) the plate 0.0005inch (0.013mm).
  • Page 21 These Surfaces These surfaes Must be Clean! must be clean!!! Spindle Wrench Spindle Wrench Cone Cone Figure A2 Attach the sample cup and swing the clip under the cup to secure it in place. Take care to avoid hitting the cone with the cup (Figure A3). Note: Do not add test sample during the gap setting procedure. Do Not Hit Do Not Hit the CONE...
  • Page 22 Index Mark Index Mark Adjusting Ring Adjustment Ring Turn Adjustment Ring Clockwise Until the % Torque Display is Stable at 0.0% Figure A4 Turn Adjusting Ring clockwise until the % torque display is stable at 0.0% Turn the adjustment ring to the right (counterclockwise as you look down on the instrument) in small increments (one or two divisions of the ring) while watching the Viscometer display.
  • Page 23 When you are satisfied the pins are just hitting (by observing acceptable % readings), make a pencil mark on the adjustment ring directly under the index mark on the pivot housing (Figure A6). Index Mark Index Mark Adjustment Adjusting Ring Ring Make a pencil Make a Pencil Mark...
  • Page 24 3) Select a viscosity standard fluid that will give viscosity readings between 10% and 100% of full scale range. Refer to Appendix B for viscosity ranges of cone spindles. Consult with Brookfield or an authorized dealer to determine which fluid is appropriate.
  • Page 25 It is best to use a viscosity standard fluid that will be close to the maximum viscosity for a given cone spindle/speed combination. Example: LVDV-II Viscometer, Cone CP-42, Fluid 10 Having a viscosity of 9.7 cP at 25°C At 60 RPM, the full scale viscosity range is 10.0 cP. Thus, the Viscometer reading should be 97% torque and 9.7 cP viscosity ±...

  • Page 26: Appendix B - Viscosity Ranges

    Appendix B - Viscosity Ranges LV(#1-4) and RV,HA,HB(#1-7) Viscometers Viscosity Range (cP) Viscometer Minimum Maximum LVDV-II+ 2,000,000 RVDV-II+ 13,300,000 HADV-II+ 26,600,000 HBDV-II+ 106,400,000 Small Sample Adapter and Thermosel SSA & T-Sel Shear Rate Viscosity (cP) Spindle (1/SEC) LVDV-II+ 0 - 29.0 400,000 0 - 132.0 10,000...
  • Page 27 DIN Adapter Accessory Viscosity (cP) Shear Rate Spindle (1/SEC) LVDV-II+ RVDV-II+ HADV-II+ HBDV-II+ 0 - 129 1.2 - 3,812 12.2 - 5,000 24.4 - 5,000 97.6 - 5,000 0 - 129 3.4 - 10,000 36.5 - 10,000 73.0 - 10,000 292.0 - 10,000 0 - 129 11.3 - 37,898 121.3 - 50,000 242.6 - 50,000 970.4 - 50,000 Spiral Adapter...
  • Page 28 10% of range because the potential viscosity error of (+/-) 1% is a relatively high number compared to the instrument reading. The second consideration involves the mechanics of fluid flow. All rheological measurements of fluid flow properties should be made under laminar flow conditions. Laminar flow is flow wherein all particle movement is in layers directed by the shearing force.

  • Page 29: Appendix C - Variables In Viscosity Measurements

    Viscometer at a constant speed recording cP values over time and find that the cP values decrease with time, the material is thixotropic. Brookfield publication, “More Solutions to Sticky Problems” includes a more detailed discussion of rheological properties and non-Newtonian behavior.
  • Page 30 container wall and the spindle surface. A repeatable viscosity test should control or specify the following: 1) Test temperature 2) Sample container size (or spindle/chamber geometry) 3) Sample volume 4) Viscometer model 5) Spindle used (if using LVDV-II+ (#1-4) or RVDV-II+ (#1-7) attach the guard leg) 6) Test speed or speeds (or the shear rate) 7) Length of time or number of spindle revolutions to record viscosity.

  • Page 31: Appendix D - Spindle And Model Codes

    Appendix D - Spindle and Model Codes Each spindle has a two digit entry code which is entered via the keypad on the DV-II+. The entry code allows the DV-II+ to calculate Viscosity, Shear Rate and Shear Stress values. Each spindle has two constants which are used in these calculations. The Spindle Multiplier Constant (SMC) used for viscosity and shear stress calculations, and the Shear Rate Constant (SRC), used for shear rate and shear stress calculations.
  • Page 32 Table D1 (continued) SPINDLE ENTRY CODE SC4-14 SC4-15 0.48 SC4-16 0.2929 SC4-18 1.32 SC4-21 0.93 SC4-25 0.22 SC4-27 0.34 SC4-28 0.28 SC4-29 0.25 SC4-31 0.34 SC4-34 0.28 SC4-37 0.36 CP40 0.327 CP41 1.228 CP42 0.64 CP51 5.12 3.84 CP52 9.83 Table D2 lists the model codes and spring torque constants for each Viscometer model.
  • Page 33 The full scale viscosity range for any DV-II+ model and spindle may be calculated using the equation: 10,000 Full Scale Viscosity Range [cP] = TK SMC Where: = DV-II+ Torque Constant from Table D2 SMC = Spindle Multiplier Constant from Table D1 The Shear Rate calculation is: Shear Rate ( 1 / Sec ) = SRC * RPM Where:...

  • Page 34: Appendix E - Calibration Procedures

    Brookfield Viscosity Standard Fluid General Information We recommend that Brookfield Viscosity Standard Fluids be replaced on an annual basis, one year from date of initial use. These fluids are pure silicone and are not subject to change over time.
  • Page 35 Brookfield Viscosity Standard Fluids are reusable provided they are not contaminated. Normal practice for usage in a 600 ml beaker is to return the material from the beaker back into the bottle. When using smaller volumes in accessories such as Small Sample Adapter, UL Adapter or Thermosel, the fluid is normally discarded.
  • Page 36 When a Helipath Stand and T-Bar spindles are used: Remove the T-bar spindle and select a standard LV(#1-4) or RV,HA,HB(#1-7) spindle. Follow the procedures for LV(#1-4) and RV,HA,HB(#1-7) Brookfield spindles outlined above. T-Bar spindles should not be used for verifying calibration of the DV-II Viscometer.
  • Page 37 3) Select a viscosity standard fluid that will give viscosity readings between 10% and 100% of full scale range. Refer to Appendix B for viscosity ranges of cone spindles. Consult with Brookfield or an authorized dealer to determine which fluid is appropriate.
  • Page 38 The current guard leg is a band of metal in the shape of the letter U with a bracket at the top that attaches to the pivot cup of a Brookfield Viscometer/Rheometer. Because it must attach to the pivot cup, the guard leg cannot be used with a Cone/Plate instrument.
  • Page 39 In some applications the 500 ml of test fluid required to immerse the spindles in a 600 ml beaker is not available. In practice, a smaller vessel may be used and the guard leg is removed. The Brookfield Viscometer/Rheometer will produce an accurate and repeatable torque reading under any measurement circumstance.

  • Page 40: Appendix F - Special Speed Sets

    SS150 SS100 SS50 SS25 SSINT Please consult Brookfield Engineering or your local dealer/distributor for any special speed require- ments not addressed by either the standard speed sets shown in Table 1 (page 8) or in Table F1. - 40 -...

  • Page 41: Appendix G - Communications

    When using the Brookfield Computer Cable (Brookfield part # DVP-80), the DV-II+ will output a data string at a rate of approximately 2.5 times per second. When using the Brookfield Printer Cable (Brookfield Part No. DVP-81), the output rate is 1.0 times per second. The DV-II+ uses the follow-...
  • Page 42 190 PRINT 200 PRINT “This program is intended to demonstrate the method for obtaining” 210 PRINT “data from the Brookfield Engineering Labs DV-II+ using an RS-232” 220 PRINT “port.” 230 PRINT “This program and/or any of the methods used within may be freely”...
  • Page 43 ‘+ ‘| Print the parsed Viscometer data string ‘+ LOCATE 4, 1 PRINT “Here is Viscometer data parsed into its constituent parts” LOCATE 5, 10: PRINT “RPM = “; RPM$ LOCATE 6, 10: PRINT “MODEL = “; MDL$ LOCATE 7, 10: PRINT “SPINDLE = “;...
  • Page 44 The output cable (Part No. DVP-96Y) connections are: Red Wire: Temperature Output Black Wire: Temperature Ground White Wire: % Torque Output Green Wire: % Torque Ground Note: Please contact Brookfield Engineering Laboratories or your local dealer/distributor for purchase of the DVP-96Y analog output cable. - 44 -...

  • Page 45: Appendix H - Model A Laboratory Stand

    APPENDIX H - Model A Laboratory Stand Gear Screw Clamp Screw Upright Rod Clamp Adjusting Screw Model A Clamp Assembly Part No. VS-24Y Clamp Assembly Base Leveling Screw Jam Nut Figure H1 Unpacking Check carefully to see that all the components are received with no concealed damage. 1 base 1 jam nut 3 leveling screws...
  • Page 46 Remove the three (3) leveling screws from the base and discard the packing material. Remove the jam nut from the upright rod. Assembly (Refer to Figure H1) Screw the leveling screws into the base. Insert the threaded end of the upright rod into the hole in the top of the base and attach the jam nut to the rod on the underside of the base.

  • Page 47: Appendix I - Dve-50 Probe Clip

    Appendix I - DVE-50 Probe Clip Probe Clip DVE-50 is supplied with all model DV-II+ Viscometers, DV-III Rheometers, and Digital Temperature Indicators. It is used to attach the RTD temperature probe to the LV Guard Leg (Part No. B-20Y) or 600 ml low form Griffin beaker. Figure H1 is a view of the Probe Clip, showing the hole into which the RTD probe is inserted, and the slot which fits onto the LV guard leg.

  • Page 48: Appendix J - Fault Diagnosis And Troubleshooting

    • Clean 4. Bent spindle • Check other spindles - replace any that are bent • If all rotate eccentrically, contact Brookfield Engineering Laboratories, Inc. or your Brookfield dealer for repair Note: Maximum permissible runout is 1/16 inch (1.6 mm) at end of spindle.
  • Page 49 2. Spindle jammed below zero • Contact Brookfield Engineering Laboratories, Inc. or your Brookfield dealer for repair Display Reading Over 100 1. Overrange “EEE” (in %, cP, and SS) • Change spindle and/or speed Viscometer Will Not Return to Zero 1.
  • Page 50 Inaccurate Readings 1. Incorrect spindle/speed selection 2. Incorrect spindle code entry 3. Non-standard test parameters 4. Temperature fluctuations 5. Incorrect equipment selection 6. Refer to: • Appendix B - Viscosity Ranges • Appendix C - Variables in Viscosity Measurement Recorder Pen Moves in Wrong Direction 1.

  • Page 51: Appendix K - Warranty Repair And Service

    Appendix K - Warranty Repair and Service Warranty Brookfield Viscometers are guaranteed for one year from date of purchase against defects in materials and workmanship. They are certified against primary viscosity standards traceable to the National Institute of Standards and Technology (NIST). The Viscometer must be returned to Brookfield Engineering Laboratories, Inc.

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