BROOKFIELD CAP VISCOMETERS MODELS CAP 1000 and CAP 2000 Operating Instructions, version 1.20 Manual No. M/94-310-F699 SPECIALISTS IN THE MEASUREMENT AND CONTROL OF VISCOSITY BROOKFIELD ENGINEERING LABORATORIES, INC. 11 Commerce Boulevard, Middleboro, MA 02346 USA TEL 508-946-6200 or 800-628-8139 (USA excluding MA) FAX 508-946-6262 INTERNET http://www.brookfieldengineering.com Brookfield Engineering Labs., Inc. Page 1 Manual No.
TABLE OF CONTENTS I. INTRODUCTION ..................................................................................... 3 I.1 I.2 I.3 I.4 I.5 I.6 II. GETTING STARTED ............................................................................... 7 II.1 II.2 II.3 II.4 II.5 II.6 II.7 II.8 III. Components .................................................................................................................. 3 Utilities ............................................................................
I. INTRODUCTION The CAP Series Viscometers are Cone and Plate geometry high shear rate instruments with integrated temperature control of the test sample material. The CAP 2000 has variable shear rate capability over the speed range from 50 - 2000 RPM. The CAP 1000 is a fixed shear rate viscometer rotating at 750 RPM on 50 Hz and 900 RPM on 60 Hz power supply. The instruments operate by digital setting and display; rotational speed can be automatically timed to stop.
The following optional items may have been included: Part No. 8. CAPCALC Software and PC Cable (CAP 2000): DOS .... CAP-114Y Windows .... CAP-225Y 9. Printer (CAP 1000 and 2000) .... PRINTER 115/PRINTER 230 10. Viscosity Standard Fluid for calibration .... See Table A1 in Appendix A 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 dealer immediately.
1) Set the viscometer on a clean level bench surface. 2) Remove shipping spindle blank and foam packing from CAP Viscometer. Store the spindle blank in the spindle case. Use again only when transporting CAP Viscometer. 3) Verify that the viscometer’s power requirements match your power source BEFORE connecting it to power. The AC input voltage and frequency must be within the appropriate range as shown on the name plate of the viscometer. Note: The CAP Viscometer must be earth grounded.
STOP The STOP key has several functions: 1. Stops the cone spindle rotation at any time. Think of it as an ESCAPE key. 2. Pressing the STOP key during any sequence of RPM, TEMP, SAMPLE, TIMER or CONE entry exits the mode and returns the display to the Main Screen (Figure 2). 3. Pressing and holding the STOP and RUN keys simultaneously selects the viscosity display units (CGS or SI) and executes the printing of a new header (Section II.1). 4.
II. GETTING STARTED II.1 Power ON Turn the power ON using the switch located on the rear of the base console. The display will sequentially show BROOKFIELD, then the MODEL of the viscometer. After about ten seconds, the MAIN SCREEN will be displayed, indicating the temperature of the sample plate (Figure 2). DEFAULT TEMPERATURES CAP L Series Viscometer CAP H Series Viscometer 25.0°C 50.0°C MAIN SCREEN 25.
When using the solvent trap, connect it to the cone adapter by sliding it up, passing the slot by the thumb screw and turning the trap clockwise onto the thumbscrew. Slide the cone up into the adapter as far as it will go and hand lock it in place with the thumb screw. Tighten the thumb screw firmly and securely. (An Allen wrench is provided as an optional method for tightening the thumb screw.) Press the CONE key. The screen displays as shown in Figure 4.
II.3 Sample Number Setting (optional) Press the SAMPLE key and the screen will be displayed as shown in Figure 6. SAMPLE NO. 0000 Figure 6 Four digits of a sample number can be set in the range 0000 to 9999. The number will be printed in the sample number column when a print sequence is executed. Using the SAMPLE key and the INDEX key, select the sample number. The same methodology used for setting the cone is used for setting the sample number.
again and the full scale viscosity is shown (Figure 9). Press RPM once more and the display will revert to the MAIN SCREEN (Figure 2). SR: 10000 /sec Figure 8 100% = 2.500 P Figure 9 II.5 Temperature Control Setting Press the TEMP key and the screen will display the current temperature setting. The default temperature on start-up is 25.0°C on low temperature models (Figure 10) and 50°C on high temperature models. SET TEMP 25.0°C Figure 10 The temperature ranges are: Low temperature: 5.0°C to 75.
Note: Entering 00 sets the manual run time mode. Pressing and holding the RUN key rotates the cone continuously. Using the TIMER and INDEX keys, select the run time for rotating the cone. After the second press of the TIMER key, the sequence is completed and the run time is set. The display will revert to the MAIN SCREEN (Figure 2). Note: II.7 Run time entries below 10 seconds are not allowed as viscometer/fluid equilibrium, in most cases, will not be established.
5. III. Pressing and holding the STOP and RPM keys simultaneously executes the sequence Shear Rate and Viscosity Display (Section II.4). OPERATION The CAP Series Viscometers rotate a very precisely machined conical spindle over a temperature controlled plate shearing the test sample at either a single rotational speed (CAP 1000) or multiple rotational speeds (CAP 2000). The CAP 1000 operates at 750 RPM on 50 Hz power supply and 900 RPM on 60 Hz power supply.
III.1 Accuracy of Measurement Table 3.1 indicates the accuracy of the viscosity measurement which depends on both the rotational speed of the cone and the percent of full scale range (in Poise) at which viscosity is measured. The accuracy for viscosity data provided by CAP Viscometers is the indicated percentage of the full scale range. See Appendix A for information on how to determine Full Scale Viscosity Range (FSR).
III.2 Repeatability CAP 1000 and CAP 2000 Viscometers are repeatable to ±0.5% of the full scale viscosity range (FSR). Due to shear heating considerations which occur in high shear rate instrumentation, the measurement of NIST Viscosity Standard Fluids at rotational speeds above 900 RPM will show a decrease in viscosity with an increase in rotational speed (shear rate).
d) If a printer is to be used, it should be connected (AC power & viscometer to printer cable). The CAP1000/2000 will print automatically when a reading is taken if the printer is connected and “on line.” Select and attach the cone (Section II.2). Note: 1. Lock the cone tightly into the adapter. 2.
11. Read the results of the sample test on the printer or write down the test conditions and viscosity results from the viscometer display. 12. Relocate the solvent trap onto the cone adapter and raise the handle. 13. It is recommended to remove the cone for cleaning. However, with care, the cone can be cleaned in place. 14. Clean the viscometer plate. Note: Cleaning of both the cone and plate should be done before solidification or drying occurs in order to minimize damage. 15.
APPENDIX A - Cone Numbers - Sample Sizes - Viscosity Ranges CAP 1000 AND 2000 VISCOMETERS Version 1.0 Cone Number Shear Rate (sec-1) Sample Size (micro liters) Calibrating Fluid Low Temp Cap at 25°C Part No. 01 02 03 04 05 06 13.33N 13.33N 13.33N 3.33N 3.33N 3.33N N = RPM 67 38 24 124 67 32 CAP1L CAP2L CAP3L CAP4L CAP5L & 1H CAP6L & 3H Calibrating Fluid High Temp Cap at 60°C *Viscosity - Part No.
SAMPLE SIZE It is necessary that sufficient sample is placed between the cone and plate to completely cover the surface of the cone when the cone is locked in the RUN position. With sufficient sample, an excess of about 1 mm in width will be seen around the periphery of the cone edge. For calibration and best reproducibility of results, the sample sizes shown in Table A1 should be used.
EXAMPLE: CAP 2000L Viscometer; Cone (02); running at 685 RPM; temperature 25.0°C; % FSR = 73.8. Determine the viscosity (poise), shear stress (dynes/cm2), shear rate (sec-1). Using Equation A1, determine the full scale viscosity range at 685 RPM: Full Scale Viscosity Range (poise) = 3,750 = 5.47 poise 685 Using Equation A5, determine the viscosity at 73.8% of full scale range: Viscosity (poise) = 5.47 (poise) x 73.8 = 4.04 poise 100 Using Equation A4, determine the shear rate: Shear Rate (sec-1) = (2)(3.
APPENDIX B - Calibration Procedures Verification of Calibration Normally there is no requirement to perform a cone calibration. Cones supplied at the time of order are calibrated to the viscometer prior to shipment. At selected intervals, depending upon usage and number of operators, the CAP Viscometer calibration should be verified using NIST Fluids. Referring to Appendix A (Table A1), find the appropriate NIST Fluid(s) for the cone(s) being used.
CALIBRATE ? NO Figure B1 Toggling the INDEX key displays the words NO and YES. 4. Press the INDEX key to display the word YES. 5. Cone 01 to 06 Press the CONE key and the viscometer displays the message: SET TEMP 25.0°C Figure B2 Using the TEMP and INDEX keys, enter the viscosity standard fluid calibration temperature. NOTE: The viscometer temperature control must be identical to the specified temperature for the viscosity standard when executing the calibration.
Pressing the CONE key after entering the fifth digit displays the message: TEMP. = 25.0°C Figure B4 Verify that the calibrating temperature, as shown in the display, is correct and stable. If the value is incorrect, press STOP, return to Step 1 and begin again. Press the RUN key to calibrate the cone. The screen will display: CALIBRATING (__) Figure B5 NOTE: The 2 digits in parentheses identify the cone that is being calibrated.
Upon pressing the CONE key to accept the last digit of the SMC value, the viscometer displays the message: SRC (00) = 00.0000 Figure B8 Using the CONE and INDEX keys, enter the Shear Rate Constant (SRC). Refer to Appendix A. Note: All Zeros are not allowed. Upon pressing the CONE key to accept the last digit of the SRC value, the viscometer displays the message: SET TEMP 25.0°C Figure B9 Using the TEMP and INDEX keys, enter the calibration temperature.
TEMP. = 25.0°C Figure B11 Verify the calibrating temperature is correct and stable. If the value is incorrect, press STOP, return to Step 1 and begin again. Press the RUN key to calibrate the cone. The screen will display: CALIBRATING (00) Figure B12 When calibration is completed, rotation will stop and the screen will display: CAL COMPLETE Figure B13 Pressing the PRINT key sends the calibrating parameters to the printer port (Figure B14) and returns the CAP to the main screen.
APPENDIX C - Glossary of Screen Displays “CAL COMPLETE” “CALIBRATE? NO” “CALIBRATE? YES” “CALIBRATING (00)” “CALL FOR SERVICE” “CAP 1000L” “CAP 1000H” “CAP 2000L” “CAP 2000H” “CGS UNITS” “EXTERNAL CONTROL” “FLUID = 00000 CP” “100% = 0000 P” “SAMPLE NO. 0000” “SELECT CONE 00” “SET RPM 0000” “SET RUN TIME 000” “SET TEMP 00.0°C” “SET TEMP 000.0°C” “SI UNITS” “SMC (00) = 000000” “SR: 00000/SEC” “SRC (00) = 00.0000” “TEMP = 000.0°C” “ 25.0°C” “USE FLUID (00)” - Brookfield Engineering Labs., Inc.
APPENDIX D - 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.
Viscometer Related Variables Most fluid viscosities are found to be non-Newtonian. They are dependent on Shear Rate and the spindle geometry conditions. The specifications of the Viscometer cone and plate geometry will affect the viscosity readings. If one reading is taken at 400 rpm, and a second at 1,000 rpm, the two viscosity values produced will be different because the readings were made at different shear rates. The faster the spindle speed, the higher the shear rate.
APPENDIX E - Communications Printer Output - CAP 1000 & CAP 2000 On the CAP Viscometer end, the cable connection is a standard 25 pin parallel printer cable connector. RS 232 Output - CAP 2000 When connecting the CAP 2000 to a computer, use Brookfield Computer Cable (Part No. DVP80). If you are not using the Brookfield computer cable, jump (connect) pins 4 and 9 (refer to Figure E1) on the CAP 2000 end of the serial cable.
CAP 2000 TRANSMIT/RECEIVE COMMANDS FOR COMPUTER COMMUNICATION Command Received Vyyy Tttt R I CAP 2000 Response Function Sets current speed and starts motor; 032H <= yyy <= 7D0H rpm; (yyy = hexadecimal speed); 50 rpm <= speed <= 2000 rpm all yyy values shall be padded to 3 characters with leading zeros; a speed of 000 will stop the motor; sets or clears the motor on bit (bit 1) in the status byte accordingly; sets illegal value bit in status byte if yyy is outside limits Sets current te
Legend: - carriage return - status byte; returned as two hexadecimal digits (see Table 2 for complete description) - identification string of the viscometer in use; This string may be one of the following: CAPLOxxx - used for the cold model (75°C maximum) CAPHIxxx - used for the hot model (200°C maximum) where xxx is the firmware version number multiplied by 100 (i.e. for firmware version 1.15, xxx would be 115).
INTERPRETATION OF BYTE STATUS Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Viscometer not zeroed x x x x x x x 0 Viscometer zeroed x x x x x x x 1 Motor off x x x x x x 0 x Motor on x x x x x x 1 x x x x x x 1 0 x Valid torque (<115.0%) x x x x x 0 x x Value outside limits1 x x x x 1 x x x Value within limits x x x x 0 x x x x x x x x x x Over torque ( 115.
SAMPLE PROGRAM FOR EXTERNAL COMPUTER CONTROL OF CAP 2000 VISCOMETER This program can be used with GWBasic, Basic, Basica, or QuickBasic. The complete program or any portion thereof may be freely used but not resold. Please note that little or no error checking is performed in this program. It is supplied to provide a working example of the CAP 2000 interface commands.
1815 1226 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1240 1241 1242 1243 1256 1257 1258 1259 1260 1265 1270 1275 1280 1285 1290 1295 1300 1305 1310 1315 1320 1325 1330 1335 1340 1345 1350 1355 1360 1365 1370 1375 1380 1385 1390 1395 1400 1405 1410 1415 1420 1425 ‘ Send command to CAP 2000 GOSUB 1870 ‘ Wait for CAP 2000 response WHILE TEMPERATURE <> SETTEMP CAPCOMMAND$ = “R” ‘ R command fetches data GOSUB 1815 ‘ Send command to CAP 2000 GOSUB 1870 ‘ Wait for CAP 2000 response GOSUB 1920 ‘ Calculate d
1430 1435 1440 1445 1450 1455 1460 1465 1470 1475 1480 1485 1490 1495 1500 1505 1510 1515 1520 1525 1530 1535 1540 1545 1550 1555 1560 1565 1570 1575 1580 1590 1595 1600 1605 1610 1615 1620 1625 1630 1635 1640 1645 1650 1655 1660 1665 ‘ ‘ ‘ Routine used to insert a delay (approximately 50 milliseconds) ‘ between each character sent to the CAP 2000.
1670 1675 1795 1800 1805 1810 1815 1820 TINTERVAL = 30 RETURN ‘ ‘ ‘ Routine to send commands to the DV-III ‘ GOSUB 2035 CAPCOMMAND$ = CAPCOMMAND$ + CR$ 1825 FOR CMD = 1 TO LEN(CAPCOMMAND$) 1830 PRINT #1, MID$(CAPCOMMAND$, CMD, 1); 1835 1840 1845 1850 1855 1860 1865 1870 1875 1880 1885 1890 1895 1900 1905 1910 1915 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1965 1970 1975 1980 1985 1990 1995 ‘ Append a carriage return ‘ to command ‘ Send one character at a ‘ time ‘ Delay between char
2000 2005 2010 2015 2020 2025 2030 2035 2040 2045 2050 2055 2060 2065 2070 2075 2080 2085 ‘ If overflow, take the ‘ complement IF SGN(DECIMALNUM) = -1 THEN DECIMALNUM = 65536! + DECIMALNUM RETURN ‘ ‘ ‘ Routine to clear the com port input buffer ‘ WHILE LOC(1) > 0 ‘ If data in input buffer DUMMY$ = INPUT$(LOC(1), #1) ‘ Dump it out GOSUB 1455 WEND RETURN ‘ ‘ ‘ Routine to close communications channel ‘ CLOSE #1 RETURN Brookfield Engineering Labs., Inc. Page 36 Manual No.
APPENDIX F - 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 warranty service. Transportation is at the purchaser's expense.
