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.
TABLE OF CONTENTS I. 1 2 3 4 5 INTRODUCTION ........................................................................... 3 DV-II+ Components .......................................................................... 3 Utilities .............................................................................................. 4 Specifications .................................................................................... 4 DV-II+ Set-Up ......................................................................
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.
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: Input Frequency: Power Consumption: 115 VAC or 230 VAC 50/60 Hz Less than 20 WATTS Power Cord Color Code: Hot (live) Neutral Ground (earth) I.
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.
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.
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.
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 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.
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 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.
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 SPDL=29 %=EEEE cP=EEEE D/CM2=EEEE 1/SEC=12.5 T=25.5C SPDL=29 %=5.2 cP=1040 D/CM2=130 1/SEC=12.5 T=25.5C cP=---- D/CM2=---- 1/SEC=0.0 T=25.
TABLE 2 Temperature Accuracies For Digital Viscometer Model DV-II+ Temperature Range Temperature Accuracy -100°C to +150°C +150°C to +300°C II.8 ±1.0°C ±2.0°C 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 Data Bits Stop Bits Parity Handshake 9600 8 1 None None Data may be printed in two ways: 1.
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.
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.
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.
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 DOWN arrow key.
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. We will assume that the user pressed the MOTOR ON/OFF key to ON and is now presented with the following display for the duration of the timed torque run: Figure 31 Note: 1.
II.10.4 Comments on Print Mode Operation The high-speed-print jumper (between pins four (4) and nine (9) on the RS-232 plug found on the Brookfield PC Cable - Part No. DVP-80) is used exclusively with Brookfield’s DVGATHER+ and WINGATHER software. This jumper if in place will override all of the above and will immediately place the DV-II+ into the maximum print speed mode.
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).
These Surfaces These surfaes Mustmust be Clean! 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 CONE the the CONE with the CUP!!! with the CUP! Figure A3 Set and start the DV-II+ running at 10 rpm.
Index Mark Index Mark Adjusting Ring Adjustment Ring Turn Adjustment Ring Clockwise Until the % Torque Display is Stable at 0.0% Turn Adjusting Ring clockwise Figure A4 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. Remember that you are trying to lower the cone so that the pin in the cone touches the pin in the cup.
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).
Each of the five available cones has a specific sample volume, as shown in Table A1. Note that the correct amount of sample fluid should cover the cone face and back up over the edge less than 1mm as shown in (Figure A8). Less Lessthan Than 1 1mm mm Cone Cone Sample Sample Cup Cup Figure A8 Notes: a) The cup may be removed without resetting the gap. b) Remove the spindle from the viscometer when you clean it. c) Reset the hit point every time the spindle is attached.
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 ± 0.197 (closer to ±0.2) cP. The accuracy is a combination of Viscometer and fluid tolerance (refer to Interpretation of Calibration Test Results).
Appendix B - Viscosity Ranges LV(#1-4) and RV,HA,HB(#1-7) Viscometers Viscometer LVDV-II+ RVDV-II+ HADV-II+ HBDV-II+ Viscosity Range (cP) Minimum Maximum 15 2,000,000 100 13,300,000 200 26,600,000 800 106,400,000 Small Sample Adapter and Thermosel SSA & T-Sel Spindle 16 18 25 31 34 81 82 83 Shear Rate (1/SEC) 0 - 29.0 0 - 132.0 0 - 22.0 0 - 34.0 0 - 28.0 0 - 129.0 0 - 129.0 0 - 129.0 Viscosity (cP) LVDV-II+ 120 - 400,000 3 10,000 480 - 1,600,000 30 - 100,000 60 - 200,000 3.4 10,000 3.4 10,000 11.
DIN Adapter Accessory Viscosity (cP) DAA Spindle 85 86 87 Shear Rate (1/SEC) 0 - 129 0 - 129 0 - 129 LVDV-II+ RVDV-II+ HADV-II+ HBDV-II+ 1.2 - 3,812 12.2 - 5,000 24.4 - 5,000 97.6 - 5,000 3.4 - 10,000 36.5 - 10,000 73.0 - 10,000 292.0 - 10,000 11.3 - 37,898 121.3 - 50,000 242.6 - 50,000 970.4 - 50,000 Spiral Adapter Viscosity (cP) Spiral Shear Rate Spindle (1/SEC) SA-70 .677 - 67.7 LVDV-II+ RVDV-II+ HADV-II+ 98.
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. For rotational systems, this means all fluid movement must be circumferential.
Appendix C - Variables in Viscosity Measurements As with any instrument measurement, there are variables that can affect a Viscometer measurement. These variables may be related to the instrument (Viscometer), or the test fluid. Variables related to the test fluid deal with the rheological properties of the fluid, while instrument variables would include the Viscometer design and the spindle geometry system utilized.
container wall and the spindle surface. A repeatable viscosity test should control or specify the following: 1) 2) 3) 4) 5) 6) 7) Test temperature Sample container size (or spindle/chamber geometry) Sample volume Viscometer model Spindle used (if using LVDV-II+ (#1-4) or RVDV-II+ (#1-7) attach the guard leg) Test speed or speeds (or the shear rate) Length of time or number of spindle revolutions to record viscosity.
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.
Table D1 (continued) SPINDLE ENTRY CODE SMC SRC SC4-14 SC4-15 SC4-16 SC4-18 SC4-21 SC4-25 SC4-27 SC4-28 SC4-29 SC4-31 SC4-34 SC4-37 CP40 CP41 CP42 CP51 CP52 14 15 16 18 21 25 27 28 29 31 34 37 40 41 42 51 52 125 50 128 3.2 5 512 25 50 100 32 64 25 0.327 1.228 0.64 5.12 9.83 0.4 0.48 0.2929 1.32 0.93 0.22 0.34 0.28 0.25 0.34 0.28 0.36 7.5 2 3.8 3.84 2 Table D2 lists the model codes and spring torque constants for each Viscometer model. Table D2 MODEL LVDV-II+ 2.
The full scale viscosity range for any DV-II+ model and spindle may be calculated using the equation: Full Scale Viscosity Range [cP] = TK * SMC * 10,000 RPM Where: TK = 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: SRC = Shear Rate Constant from Table D1 - 33 -
Appendix E - Calibration Procedures The accuracy of the DV-II+ is verified using viscosity standard fluids which are available from Brookfield Engineering Laboratories or your local Brookfield agent. Viscosity standards are Newtonian, and therefore, have the same viscosity regardless of spindle speed (or shear rate). Viscosity standards, calibrated at 25°C, are shown in Table E1. Container size: For Viscosity Standards <30,000 cP, use a 600 ml Low Form Griffin Beaker having a working volume of 500 ml.
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. Calibration Procedure for LV(#1-4) and RV,HA,HB(#1-7) Brookfield Spindles 1) Place the viscosity standard fluid (in the proper container) into the water bath.
1) Put the proper amount of HT viscosity standard fluid into the HT-2 sample chamber. The amount varies with the spindle used. (Refer to the Thermosel instruction manual). 2) Place the sample chamber into the Thermo Container. 3) Put the spindle into the test fluid and attach the extension link, coupling nut and free hanging spindle (or directly attach the solid shaft spindle) to the DV-II+. 4) Allow 30 minutes for the viscosity standard, sample chamber and spindle to reach test temperature.
4) The viscosity standard fluid, together with the spindle, should be immersed in the bath for a minimum of 1 hour, stirring the fluid periodically (operate at 50 or 60 RPM periodically), prior to taking measurements. 5) After 1 hour, check the temperature of the viscosity standard fluid with an accurate thermometer. 6) If the fluid is at test temperature (+/- 0.1°C of the specified temperature, normally 25°C), measure the viscosity and record the viscometer reading.
Brookfield Viscosity Standards Fluids are accurate to (+/-) 1% of their stated value. Example: Calculate the acceptable range of viscosity using RVDV-II+ with RV-3 Spindle at 2 RPM; Brookfield Standard Fluid 12,500 with a viscosity of 12,257 cP at 25°C: 1) Calculate full scale viscosity range using the equation: Full Scale Viscosity Range [cP] = TK * SMC * 10,000 RPM Where: TK SMC = = 1.
is converted to centipoise. Without changing the spindle factor to suit the new boundary conditions, the calculation from instrument torque to viscosity will be incorrect. Practically speaking, the guard leg has the greatest effect when used with the #1 & #2 spindles of the LV and RV spindle sets. Any other LV (#3 & #4) or RV (#3 - #7) spindle can be used in a 600 ml beaker with or without the guard leg to produce correct results.
Appendix F - Special Speed Sets The following special speeds sets are available from Brookfield Engineering Laboratories. All speeds are in units of RPM. Table F1 SPEED SET (RPM) RPM Step SS200 SS150 SS100 SS50 SS25 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 0.0 1.0 1.4 1.8 2.0 4.0 6.0 8.0 10 20 40 60 80 100 120 140 160 180 200 0.0 0.8 1.1 1.4 1.5 3.0 4.0 6.0 7.5 15 30 40 60 75 90 105 120 135 150 0.0 0.5 0.7 0.9 1.0 2.0 3.0 4.0 5.0 10 20 30 40 50 60 70 80 90 100 0.0 0.2 0.3 0.4 0.5 1.0 1.
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.
Shear Stress (Dynes/Cm2) = TK * SMC * SRC * Torque = 0.09373 * 32.0 * 0.34 * 62.3 = 63.5 Dynes/Cm2 The following is a program written in BASIC that receives these strings, parses out the appropriate data, performs the above calculations and displays the data to the screen.
550 560 570 580 590 600 610 620 630 640 650 660 670 680 690 700 710 720 730 740 750 760 770 780 790 800 810 820 830 840 850 860 ‘+ + ‘| 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 = “; SPD$; “” LOCATE 8, 10: PRINT “TORQUE % = “; TOR$ LOCATE 9, 10: PRINT “VISCOSITY cP = “; CPS$ LOCATE 10, 10:PRINT “SS Dynes/cm^2 = “; SHS$ LOCATE
DV-II+ Serial and Analog Outputs 1 No Connection 6 Analog Ground 2 No Connection 7 3 Transmit Data (TxD) 8 4 High Speed Print (Note 1) Serial Ground 9 Analog % Torque (Note 2) Analog Temperature (Note 3) High Speed Print (Note 1) 5 Figure G1 Notes: 1. Placing a jumper across pins 4 and 9 causes the DV-II+ to output printer data at a 3 line-per-second rate. No jumper across pins 4 and 9 retains the once-per-second printer output rate. 2. This is a 0-1 volt d.c.
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.
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. With the rod gear rack facing forward (toward the “V” in the base), gently tighten the jam nut.
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.
Appendix J - Fault Diagnosis and Troubleshooting Listed are some of the more common problems that you may encounter while using your Viscometer. Spindle Does Not Rotate 1. Incorrect power supply • Check - must match Viscometer requirements 2. Viscometer not plugged in • Connect to appropriate power supply 3. Power switch in “off” position • Turn power switch on Spindle Rotates Eccentrically 1. Viscometer is not level • Adjust the laboratory stand 2. Spindle not screwed securely to coupling • Tighten 3.
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. Viscometer is not level • Check with spindle out of the sample • Adjust the laboratory stand 2. Pivot point or jewel bearing faulty • Perform calibration check • Contact Brookfield Engineering Laboratories, Inc.
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. Output polarity reversed • Reverse leads No Recorder Response 1. Viscometer is at zero reading 2. Recorder is off 3. Output cable leads shorted 4. Recorder is in standby 5.
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. or the Brookfield dealer from whom it was purchased for no charge warranty service. Transportation is at the purchaser’s expense.
