dv-iii ultra rheometer manual

dv-iii ultra rheometer manual

To browse Academia.edu and the wider internet faster and more securely, please take a few seconds to upgrade your browser. You can download the paper by clicking the button above. Related Papers viscosity solutions By Amit Bachhawat MORE SOLUTIONS TO STICKY PROBLEMS By Angela Idarraga A NEW APPLICATION FOR BROOKFIELD VISCOMETERS: VISCOELASTIC PROPERTY DETERMINATION By uwimbabazi eric Rheological characterization of fibrillated cellulose suspensions via bucket vane viscometer By Katarina Dimic-misic and Jouni Paltakari Determination of Rheological Behavior of Aluminum Oxide Nanofluid and Development of New Viscosity Correlations By Dipak Das READ PAPER Download pdf. Please check your inbox, and if you can’t find it, check your spam folder to make sure it didn't end up there. Please also check your spam folder. 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-III Ultra. The viscous drag of the fluid against the spindle is measured by the spring deflection. Spring deflection is measured with a rotary transducer. The viscosity measurement range of the DV-III Ultra (in centipoise or cP) 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. SeeSectionI.3formoreinformation on yield stress. The viscosity measurement range for each spring torque model may be found in Appendix B. The associated properties are the The yield stress is the critical shear stress, applied to the sample, at The yield strain is the deformation in the material, resulting from the applied stress prior to the start of flow. Foods often have yield points. Ketchup in particular must flow out of a Thus, the yield behavior of many foods contributes to the food texture that we like.http://djarkitek.com/temp/vinney/HTML/userfiles/color-imagerunner-c4080-manual.xml

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Many latex house paints, for example, are easily stirred or However, a thin layer of applied paint (if a good one!), that is allowed to rest The vane spindle is immersed in the test material. Spring deflection is measured with a rotary transducer. The maximum torque value is the yield point. The straight line in Figure I-3 is a repeat of what was shown in Figure I-2. An algorithm in the firmware converts the maximum torque value Ifyouaremissinganyparts,pleasenotifyBrookfieldEngineeringoryourlocal Brookfield agent immediately. Any shipping damage must be reported to the carrier. All Brookfield offices and our network of representatives and dealers can be found on our web site: www.brookfieldengineering.com The rack gear and clamp assembly should face the rear of the base (see Figure I-4). Tighten this nut with a suitable wrench (spanner). Insert the other end of the ribbon cable into the connector on the DV-III Ultra base (see Figure I-6). The level is adjusted using the three leveling screws on the base. Adjust so that the bubble level on top of the DV-III Ultra (see Figure I-5) is centered within the circle. Connect theAC plug to the socket on the back of the DV-III Ultra base and plug it into the appropriate AC line. Allow at least 10 minutes for warm up; 30 minutes is preferable. The cables and connections required for proper communication are detailed below. Some PCs may also have Com Port 3 and Com Port 4. These cables are supplied with the DV-III Ultra. Some PCs may also have Com Port 3 and Com Port 4. This cable is supplied with the DV-III Ultra. Both cables are supplied with the RHEOCALC software. In this configuration, the controller is connected to the computer through either Com Port 1 or Com Port 2 by using the DVP-80 cable. The DV-III Ultra can also be connected to a computer through the USB Port by using the DVP-202 cable. This cable is supplied with a Brookfield strip chart recorder. Thefollowingdescribes each key’s function. Cancels any operation.http://facemz.com/userfiles/color-imagerunner-c5185-manual.xml

Returns the user to the previous screen. Toggles between selectable items when indicated. Selects printing and non-printing mode as selected in the Options menu. Constructsatestprogram. Execute a Bevis program. Not doing so may result in deposit build-up on the upper part of the shaft and cause interferences between the shaft and the pivot cup. Severe instrument damage may result if the spindle is cleaned in place. Do not use solvents Clean with a This is done each time the power switch is turned on. The Rheometer will guide you through the procedure, as follows: When the motor is ON, the actual speed of rotation will be displayed. When the motor is switched from ON to OFF, the speed of rotation will be remembered; when the motor is turned ON again, the DV-III Ultra will operate at that same speed.Viscosity, shear rate, and shear stress values will be calculated based on this number. See Section II.3. In these cases, the display will show 0.0. Additionally, selected programs available for running will be identified here when in the Program mode. (See Section IV.2). The displayed data may be changed as described in the following sections. Actual rheometer display will have all fields left justified. Based onthismeasurement,viscosityandshearstressarecalculated. Brookfieldrecommendsthatdatabe collected only in the range of 10 to 100%. Any data collected outside of this range is considered invalid. The viscosity and shear stress field will display dashes ( - - - - ) as indicated in Figure II-6: The DV-III Ultra control program will use the previously blank line 3 on the default display screen to record the new spindle input as depicted in Figure II-7. Valid spindle numbers encompass the range from 00 to 99 as listed in Appendix D. Mistakes are corrected by repeatedly pressing the numeric keys until the proper spindle value has been entered. At that point, the user presses the SELECT SPDL key again.

An invalid spindle entry will result in a The screen in Figure II-9 appears. The screen in Figure II-10 appears.Press the “1” key for YES. Use the “2” key for scrolling downward ( e ) and the “8” key for scrolling upward ( e ). The spindle name can be changed to any (2) letters from A to Z. Press the “enter” key to accept. You must have the SMC (spindle multiplier constant) and the SRC (the shear rate constant). Enter the first set of numbers.You can enter up to 5 special spindles. You may press YES to repeat or NO to finish. Ifso,youwillneedtocomplete the steps until you are prompted to “Save New Spindle”. For example, if you have three special spindles entered and need to modify the second spindle, you will need to proceed through the third spindle parameters by pressing “Enter” until prompted to “Save New Spindle”. This will then save the modified spindle. Enter a valid speed in the range of 0.01 to 250 RPM by pressing the numeric keys successively. The previously blank line 3 on the default display screen records the user’s new speed input as depicted in Figure II-17: If the user makes more than five ( 5 ) key presses, the DV-III Ultra control program will “ roll ” the cursor back to the first character of the field and begin to overwrite the previous data entry. The motor will begin running at 112 RPM To configure the external control mode, connect computer interface cable DVP-80 With the DVP-80 cable in place, the DV-III Ultra will present the screen shown in Figure If external control is selected, the DV-III Ultra will display Figure II-21 and only accept control commands from RHEOCALC software. Periodic verification of calibration is an important procedure. We recommend that you check the calibration of your DV-III Ultra on a regular basis. The frequency of calibration checks should be set based on your use of the instrument and the significance of the data. We generally recommend a frequency of 1 month.

See Appendix E - Calibration Check Procedure for information on performing a calibration check. Please check our web site for information on our dealers and a Laboratory Return Form; www.brookfieldengineering.com. Please follow the suggestions below. Be sure to install the shipping cap. This screw should be tight enough to prevent the unit from moving down the rod spontaneously but not so tight as to prevent the operator from moving the unit with the adjustment knob. The pivot cup and spindle connection should be clean and free of any material. This will ensure proper connection of the spindle to the unit and proper rotation of the spindle (minimize run out). Remove the spindle from the unit prior to cleaning, not doing so may result in the spindle being bent. Use cleaning solvents that are compatible with 300 series stainless steel. Do not use abrasive cloths. Do not use harsh solvents or abrasive materials. Solvents may remove factory paint. Do not drop the spindle on the lab bench or floor. We recommend placing a rubber mat in the areas around the DV-III Ultra when these spindles are in use. If you have experience with other Brookfield equipment, this section will give you the quick steps for taking a viscosity reading. If you have not used a Brookfield Viscometer before, skip this section and go to Section III.2 for a detailed description. If you have experience with the YR-1, this section will give you the quick steps for taking a yield stress reading. If you have not used a Brookfield Viscometer before, skip this section and go to Section IV.8 for a detailed description. The rheometer will display the “PROGRAM MODES” screen as shown in Figure II.20. Press the “4” key to access the Yield Program. In the upper right corner of the main screen, set the instrument setting to “DV-III ULTRA” and the COM port setting to the appropriate com port. Insert values for the EZ-Yield test parameters as explained in Section I.3 and save the file if required for future use.

The screen on the rheometer will show “DOWNLOAD COMPLETE, PRESS ANY KEY”. Confirm that the correct spindle is attached to the rheometer and that the sample is properly prepared and in position to begin the test. Press the ENTER button to start the test. The DV-III Ultra will send data to the PC and the graph of the yield stress flow behavior will be captured. The Data page in the software will record the actual numerical values for shear stress. The level is adjusted using the three feet on the bottom of the base and confirmed using the bubble on the top of the head. Adjust the feet until bubble is inside the center target. Set the level prior to autozero and check the level prior to each measurement. Many other spindle systemsaresuppliedfromBrookfieldwithspecificsamplechamberssuchastheSmallSample Adapter, ULAdapter and Thermosel. You may choose to use an alternate container for convenience, however, this may have an effect on the measured viscosity. The DV-III Ultra is calibrated considering the specified container.When conditioningasamplefortemperature,besuretotemperaturecontrolthecontainerandspindle as well as the sample. The spindle connection method may be changed by sending the DV-III Ultra to Brookfield or our authorized agents. There is an adapter available to convert Standard Threaded Spindles to EZ-Lock Spindles. It is not possible to use EZ-Lock Spindles on a Standard Threaded Unit. Contact Brookfield for more information. Note that the spindles have a left-handed thread. The lower shaft should be secured and slightly lifted with one hand while screwing the spindle 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. InserttheEZ-LockSpindleCouplingsothatthebottomofthecoupling is flush with the bottom of the sleeve, and lower the sleeve.

This range is achieved through the use of several spindles over many speeds. When measuring yield stress with vane spindles, a broad measurement range is also possible through the choice of multiple spindles. An appropriate selection will result in measurements made between 10-100 on the instrument % torque scale. Two general rules will help in the trial and error process. When this circumstance occurs, any of the spindles may be selected. The test is conducted with one spindle at one speed. The DV-III Ultra can be used for single point measurement. This non-Newtonian flow behavior is commonly seen in paints, coatings and food products as a decrease in viscosity as shear rate increases or an increase in yield stress as rotational speed increases. This behavior cannot be detected or evaluated with the single point measurement. The same applies to yield stress determination by analyzing torque vs.This information will allow for a more complete characterization of a fluid and may help in formulating and production of the product. The DV-III Ultra is capable of collecting multiple data points for comprehensive analysis of flow behavior. See Section IV on Programming and Analysis. The display will change to present a menu with four choices: DVIII, B.E.V.I.S., Models and Yield as shown in Figure IV-1. DV-III, B.E.V.I.S. and Yield are the programming alternatives. Models will present the five math models available for viscosity data analysis (see IV.7 for more details about Math Models). The captured data may be displayed and analyzed or output to a printer. Programs may be written using three different methodologies: DV-III, B.E.V.I.S and Yield. Aprogram consists of multiple lines (up to 25) instructing the rheometer to operate at a particular speed for some period of time.

As an example, we can instruct the DV-III Ultra to rotate the spindle at 5 RPM for 30 seconds and then change speed to 10 RPM and wait 20 seconds with the following program: Complete details on this programming technique are in Section IV.2. Aprogram consists of a series of commands instructing the rheometer in speed control, time control, datacollection,temperaturecontrol,andoutput. B.E.V.I.S.offersahigherlevelofrheometercontrol comparedtotheDV-IIImethod. However,theconstructionofB.E.V.I.Sprogramsismoreinvolved. The 2-step DV-III program previously described is duplicated using B.E.V.I.S. commands below: Complete details on this programming technique are in Section IV.3. Programs can be created with up to 25 steps. The DV-III Ultra can store up to 10 programs. Upon completion of a program, the data may be viewed on the DV-III Ultra display, analyzed or printed to an attached parallel or serial printer. The reading is takenattheendof the hold time interval in a Prog Speed Set or when the ENTER key is pressed in a Next Speed Set. If the first step interval is 1 second or more, the program is a Prog Speed Set type. The program locations are numbered 0 through 9. These speed sets are retained in EEPROM memory for those times when the DV-III Ultra is not powered up. To access a previously programmed speed set or to enter data for a new speed set, the user presses the “ 1 ” key when in the display of Figure IV-1 and is presented with the screen shown in Figure IV-2: Select any one of the ten speed sets by pressing the appropriate numeric key. For now let’s assume that the user wants to program a new speed set by pressing the “ 3 ” key (the first available program slot). We will cover the inputting of finite step time programs first. On pressing the “ 3 ” key in Figure IV-3 the user is presented with: The user may of course change it to any valid time of his choice.

Whenever you change time interval, that new time becomes the default interval until it is again changed by the user. Also, note that zero (0) times are not allowed for program steps after the first step for Finite Step programs. On entry to this screen, the underscore cursor would be flashing (as shown) under the first digit of the step RPM. Use the numeric keys to make changes to the step speed, repeating the input as many times as required until satisfied. Speed or time data that is out of range, as defined by Table II-1, will result in the following screen: In either case, the following screen will be displayed: At the completion of the direct speed input, the display would revert to Figure IV-7 above with the appropriate RPM displayed, and the viscometer running at that speed. On pressing the “ 3 ” key in Figure IV-3 the user is presented with the same screen that he saw in the above description for finite step programs: However, for time, input 00:00 and press the ENTER key. From this point forward, the user will only be able to enter speeds since each press of the ENTER key will advance him to the next step. To correct a speed after pressing the ENTER key for that step, wait until the program is complete and then edit the program to correct the mistake. To end a program, simply enter and accept a step RPM of zero (0) or continue to input step data until the program reaches the twenty-five (25) step program limit.In either case, the user is presented with: If all is well (i.e. satisfied the above requirements) the rheometer will display: When it is pressed, the DV-III Ultra will send the following data to the attached printer: After the printing is complete, the user will be returned to the display of Figure IV-9. The user may also have programmed speed sets that are no longer required and would like to remove.

If he wished to permanently remove that new speed set, or any other IN MEMORY speed set he would, while in the screens of Figure IV-2, press the “ 2 ” key and be presented with: Any attempt to delete an in-use speed (“ 3 ” for instance) will cause the DV-III Ultra to issue a “beep beep” with no action being taken. Thus no active (i.e. selected for use) program can be deleted from this screen. That done the user is sent to the default screen with: “ SPEED SET X SELECTED ” displayed on line three (3) of the screen. If the user presses the PROG RUN key with no speed set selected, the following error box will be displayed: The user could elect to use the entire speed set at this point by pressing the PROG RUN key. If the user had previously selected a start and end step, those values would be displayed upon entry to this screen instead of the program limit values as shown above. However, while a speed set can contain up to 25 separate speeds, the user may be in a situation where only a few contiguous steps may be required. Therefore, this screen allows for the option of entering the range of speeds encompassed by the start step (not necessarily the first step) and the end step (not necessarily the last step). Pressing any numeric key at this point will erase the currently displayed start step and substitute the new value. The user may select a start step less than the end step ( a so-called Up Ramp ) or a start step greater than the end step ( a so-called Down Ramp ). Any attempt to enter a start or end speed not contained in the speed set will result in the following display: Repeated pressing of the ENTER key will allow the user to move back-and-forth between the start and end entries and change them as required until the correct start and end step values have been entered. The selected speed set, and the start and end steps values entered, will be retained in EEProm memory for use the next time the viscometer is powered up in the stand-alone mode.

After pressing the “1” or “3” keys the user would be returned to the display of Figure IV-15. From Figure IV-15 the user runs the program by pressing the PROGRAM RUN key which signifies that the user is satisfied with his start and stop step values, and wishes to start running with the selected speed set. In either case, if the user has enabled the lockout mode, the top line of the default display will change as shown in Figure IV-18 below: However, if the viscometer motor was not turned on, the following message would be displayed: This will cause the viscometer to start running at the first selected program speed. The DV-III Ultra will continue to operate at 112 RPM until the ENTER key is pressed. At that point (pressing the ENTER key), two distinct events will occur: After the last speed has been executed (i.e. the user pressed the ENTER key for the twelfth time), the viscometer speed will be set at ZERO RPM and the following message will be displayed: As the programmed time interval elapses, the following will occur. Please check your inbox, and if you can’t find it, check your spam folder to make sure it didn't end up there. Please also check your spam folder. Having this information readily available will help us to assist you should there be any questions regarding your instrument. 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 for each torque calibration may be found in Appendix - B. Please read this manual prior to using the instrument. 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. The rack gear and clamp assembly should face the rear of the base (see Figure 1). 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).

The level is adjusted using the three leveling screws on the base.The cables and connections required for proper communication are detailed below. The following describes each key’s function. Cancels any operation, returns the user to the previous screen. See Section V. Toggles between selectable items when indicated. Selects printing and non-printing mode as selected in the Options menu. Contstructs a test program. Execute a Bevis program. This is done each time the power switch is turned on. The Rheometer will guide you through the procedure, as follows: When the motor is ON, the actual speed of rotation will be displayed.Viscosity, shear rate, and shear stress values will be calculated based on this number. See Section II.3. See Section II.5. In these cases, the display will show 0.0. Additionally, selected programs available for running will be identified here when in the Program mode. (See Section IV.2). The displayed data may be changed as described in the following sections. Actual rheometer display will have all fields left justified. Brookfield recommends that data be collected only in the range of 10 to 100%. Any data collected outside of this range is considered invalid. The viscosity and shear stress field will display dashes (- - - - ) as indicated in the next screen display: Valid spindle numbers encompass the range from 00 to 99 as listed in Appendix D. Mistakes are corrected by repeatedly pressing the numeric keys until the proper spindle value has been entered. An invalid spindle entry will result in a “ beep ” and the display of the data entry error screen as depicted below. This error message will be displayed for a few seconds after which the spindle entry screen ( Figure 11 ) will be re-displayed with a blank field for the spindle number.This will result in the following display: This list is created at the time the Rheometer is manufactured.

This list will therefore depend on the number of special spindles ordered and could contain as few as one (1) or as many as five (5) spindles. If no special spindles were purchased, the following message will be displayed if 99 is entered for a spindle number: The user may again select another spindle or press the SELECT SPDL key to cancel spindle selection operation. For standard spindles this would be the two (2) digit designator used to select the spindle. In the case of special spindles, the two (2) letters ( AA, AB, AC, AD or AE ) corresponding to the special spindle would be displayed instead. The spindle number or letters will be retained in memory when power is removed. This means that the last value entered for the spindle will be displayed the next time the Rheometer is turned on. Enter a valid speed in the range of 0.01 to 250 RPM by pressing the numeric keys successively. The previously blank line 3 on the default display screen records the user’s new speed input as depicted in Figure 15: The motor will begin running at 112 RPM and the display will be updated to the next screen image: If you have experience with other Brookfield equipment, this section will give you the quick steps for taking a viscosity reading. If you have not used a Brookfield Viscometer before, skip this section and go to Section III.2 for a detailed description. The level is adjusted using the three feet on the bottom of the base and confirmed using the bubble on the top of the head. Set the level prior to autozero and check the level prior to each measurement. Many spindle systems from Brookfield are supplied with specific sample chambers such as the Small Sample Adapter, UL Adapter and Thermosel.You may choose to use an alternate container for convenience, however, this may have an effect on the measured viscosity.When conditioning a sample for temperature, be sure to temperature control the container and spindle as well as the sample.

Two general rules will help in the trial and error process. When this circumstance occurs, any of the spindles may be selected. The test is conducted with one spindle at one speed.This non-Newtonian flow behavior is commonly seen in paints, coatings and food products as a decrease in viscosity as shear rate increases. This behavior cannot be detected or evaluated with the single viscosity point measurement. This information will allow for a more complete characterization of a fluid and may help in formulating and production of the product. See Section IV on Programming and Analysis. Use cleaning solutions that are not corrosive and avoid scratching the measurement surfaces. The instrument housing should be cleaned with a soft damp cloth. Models will present the five math models available for data analysis. The captured data may be displayed and analyzed or output to a printer. Programs may be written using two different methodologies, DV-III and B.E.V.I.S. A program consists of multiple lines (up to 25) instructing the rheometer to operate at a particular speed for some period of time.A program consists of a series of commands instructing the rheometer in speed control, time control, data collection, temperature control, and output. B.E.V.I.S. offers a higher level of rheometer control compared to the DV-III method. However, the construction of B.E.V.I.S programs is more involved. The 2-step DV-III program previously described is duplicated using B.E.V.I.S. commands below: The reading is taken at the end of the hold time interval in a Prog Speed Set or when the ENTER key is pressed in a Next Speed Set. If the first step interval is 1 second or more, the program is a Prog Speed Set type. Select any one of the ten speed sets by pressing the appropriate numeric key. For now let’s assume that the user wants to program a new speed set by pressing the “ 3 ” key (the first available program slot). We will cover the inputting of finite step time programs first.

On pressing the “ 3 ” key in Figure 22 The user may of course change it to any valid time of his choice. Also, note that zero (0) times are not allowed for program steps after the first step for Finite Step programs. Use the numeric keys to make changes to the step speed, repeating the input as many times as required until satisfied. The same procedure is used here to input the step time as was used to enter the RPM above. Speed or time data that is out of range, as defined by Table 1, will result in the following screen: To end a program, the user simply enters and accepts a step RPM and Time of zero (0) or continues to input step data until the program reaches the twentyfive (25) step program limit. In either case, the following screen will be displayed: This would immediately revert to the default screen modified as follows: At the completion of the direct speed input, the display would revert to Figure 26 above with the appropriate RPM displayed, and the viscometer running at that speed. On pressing the “ 3 ” key in Figure 22 the user is presented with the same screen that he saw in the above description for finite step programs: However, for time, input 00:00 and press the ENTER key. To end a program, simply enter and accept a step RPM of zero (0) or continue to input step data until the program reaches the twenty-five (25) step program limit.In either case, the user is presented with: If all is well (i.e. satisfied the above requirements) the rheometer will display. Page 1 Manual No. M98-211-E0912 BROOKFIELD DV -III UL TRA Programmable Rheometer Operating Instructions Manual No. Page 1 Manual No. Page 2 Brookfield Engineering Laboratories, Inc. Brookfield Engineering Laboratories, Inc. Page 2 Page 2 Manual No. M98-211-E0912 Manual No. Page 3 Table of Contents I. Introduction. 5 I.1 Torque Measurement.5 I.2 Viscosity Units of Measurement.5 I.3 Yield Stress Measurement. Page 4 Table of Contents (cont'd) IV.7.5 Other Common Rheological Models.42 IV.