BROOKFIELD KU-2 Viscometer Operating Instructions Manual No. M04-242-D0612 SPECIALISTS IN THE MEASUREMENT AND CONTROL OF VISCOSITY with offices in : Boston • Chicago • London • Stuttgart • Guangzhou BROOKFIELD ENGINEERING LABORATORIES, INC. 11 Commerce Boulevard, M iddleboro, M A 02346 USA T EL 508-946-6200 F AX 508-946-6262 or 800-628-8139 (USA e xcluding MA) INTERNET http://www.brookfieldengineering.
Brookfield Engineering Labs., Inc. Page 2 Manual No.
TABLE OF CONTENTS I. INTRODUCTION......................................................................................4 I.1 I.2 Components.................................................................................................................4 Options.........................................................................................................................5 I.2.1 Air Purge................................................................................................................
I. INTRODUCTION The Brookfield KU-2 Viscometer measures fluid viscosity in Krebs units. A paddle type spindle is driven at 200 rpm by a constant speed motor. The reaction torque of the spindle rotating at 200 rpm is converted to viscosity in Krebs Units. The digital display of the Viscometer shows viscosity in Krebs Units (KU), the associated grams value (gm), and viscosity in centipoise (cP). The value for centipoise is a conversion from the Krebs value as described in the ASTM standard D562.
I.2 Options I.2.1 Air Purge The air purge option, Part No. KU-2A (Figure 2), allows the interior of the KU-2 to be pressurized with air (or an inert gas) when the instrument is to be used in a hazardous environment. A builtin pressure switch turns the instrument off when the pressure drops below 2.0 PSI (falling). The switch comes on at 10.0 PSI (rising). Air Purge Fitting Connect a regulated clean air (or inert gas) supply which is non-corrosive to brass to the fitting shown in Figure 2.
I.3 Specifications Range: 40–141 KU 32–1,099 gm 27 - 5,274 cP* Accuracy: ± 1% of full scale range Repeatability: ± 0.5% of full scale range Paddle speed: 200 rpm ± 0.1 rpm Printer output: 25D-Type Centronics Parallel Printer Output Net weight: 22 lb. (10 kg) Gross weight: 25 lb. (11 kg) Dimensions: 15 x 11 x 20 Operating Environment: 0°C (32°F) to 40°C (104°F) 20% - 80% R.H.
I.6 Safety Symbols and Precautions Safety Symbols The following explains safety symbols which may be found in this operating manual. Indicates hazardous voltages may be present. Refer to the manual for specific warning or caution information to avoid personal injury or damage to the instrument. Precautions If this instrument is used in a manner not specified by the manufacturer, the protection provided by the instrument may be impaired.
I.8 Viscosity Units The Krebs Unit is a special measure of viscosity that is not based on the Newtonian model of flow. The ASTM test method D562 was originally developed around the special conditions of an instrument that used gravity to drive a paddle spindle at 200 rpm. The weight required to achieve 200 rpm varied depending upon the viscosity of the fluid under test. The Krebs unit was developed through the correlation of the weights used and the time required for 100 revolutions of the paddle.
II. OPERATION II.1 Set-Up 1) Be sure that the power switch is off. Attach the power cord to the appropriate power source. 2) Move the operating handle to the top (upper most) position. 3) Connect the printer (if used) to the parallel port. Be sure the printer power is off. 4) Loosen the thumb screw on the Viscometer shaft; insert the paddle spindle into the Viscometer shaft, as far as it will go. Line up the groove on the spindle with the hole that the thumb screw goes into. Tighten the thumb screw.
7) Move the Viscometer handle down to the lowest position. This will automatically immerse the spindle into the fluid. If the correct amount of fluid has been put into the container, the surface of the fluid will be at the immersion mark of the spindle. CAUTION: When using the 1/2 pint can, do not lower the spindle directly into the container. The narrow diameter of the can requires the spindle to be introduced at an angle. Tilt the 1/2 pint can while lowering the viscometer.
Appendix A - KU-2 Calibration Information The accuracy of the KU-2 is verified using viscosity standard fluids calibrated in Krebs Units, which are available from Brookfield Engineering Laboratories or your local Brookfield dealer/distributor/ representative. Note: Calibration should not be verified using the centipoise scale. The centipoise scale is for reference use only and is based on a correlation from the Krebs Unit details in the ASTM test method D562. Viscosity Standards are calibrated at 25°C.
5) Wait five (5) seconds for the reading to stabilize. Switch the Hold Reading Switch to the "DOWN" position. You will need to record measurements in KU and gm. These two values work together to let you interpret the calibration results. 6) After you have recorded results in KU, then move the Selector knob to the "gm" position and record your reading in grams.
4) Now that you have the accuracy for the instrument, you can add it to the accuracy of the fluid. The fluid is accurate to ± 1% of the stated value in KU. The viscosity standard is calibrated at 104.8 KU, ± 1% is equal to ± 1.0 KU. 0.9 KU (instrument accuracy) + 1.0 KU (fluid accuracy) 1.9 KU (total allowable error) 5) Total allowable error for the calibration check in this example is 104.8 KU, ± 1.9 KU (102.9 KU to 106.7 KU).
Table A-2 g KU cP 32 40.2 27 33 40.6 32 34 40.9 36 35 41.3 41 36 41.6 46 37 42.0 51 38 42.3 56 39 42.6 61 40 43.0 66 41 43.3 71 42 43.6 76 43 44.0 81 44 44.3 86 45 44.6 91 46 45.0 95 47 45.3 100 48 45.6 105 49 45.9 110 50 46.3 115 51 46.6 120 52 46.9 125 53 47.2 130 54 47.5 135 55 47.9 140 56 48.2 145 57 48.5 150 58 48.8 154 59 49.1 159 60 49.4 164 61 49.7 169 62 50.0 174 63 50.3 179 64 50.6 184 65 50.9 189 66 51.2 194 67 51.5 199 68 51.8 204 69 52.1 209 70 52.4 213 71 52.
Table A-2 (continued) g 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 KU cP g KU cP g KU cP g KU 121.0 121.1 121.1 121.2 121.2 121.3 121.3 121.4 121.4 121.5 121.6 121.6 121.7 121.7 121.8 121.8 121.9 121.9 122.0 122.0 122.0 122.1 122.1 122.2 122.
Appendix B - References The KU-2 Viscometer is compatible with: ASTM D 562 Standard Test Method for Consistency of Paint Using the Stormer Viscometer Brookfield Engineering Labs., Inc. Page 16 Manual No.
Appendix C - Online Help and Additional Resources www.brookfieldengineering.com** The Brookfield website is a good resource for additional and self-help whenever you need it. Our website offers a selection of “how-to” videos, application notes, conversion tables, instructional manuals, material safety data sheets, calibration templates and other technical resources. http://www.youtube.com/user/BrookfieldEng Brookfield has its own YouTube channel.
Appendix D - 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.