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Brookfield DV-I+ Series, Руководство по эксплуатации

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    Brookfield Engineering Laboratories, Inc.

Page   38

Manual No. M/92-021-N0902

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.  A guard leg is supplied with all LV and
RV series instruments, but not with the HA or HB series.  It’s shape is designed to accommodate the
spindles of the appropriate spindle set; therefore, the RV
guard leg is wider than the LV due to the large diameter of
the RV #1 spindle.  They are not interchangeable.

The calibration of the Brookfield Viscometer/Rheometer is
determined using a 600 ml Low Form Griffin Beaker.  The
calibration of LV and RV series instruments includes the
guard leg.  The beaker wall (for HA/HB instruments) or the
guard leg (for LV/RV instruments) define what is called the
“outer boundary” of the measurement.  The spindle factors
for the LV, RV, and HA/HB spindles were developed with
the above boundary conditions.  The spindle factors are used
to convert the instrument torque (expressed as the dial read-
ing or %Torque value) into centipoise.  Theoretically, if mea-
surements are made with different boundary conditions, e.g.,
without the guard leg or in a container other than 600 ml
beaker, then the spindle factors found on the Factor Finder
cannot be used to accurately calculate an absolute viscosity.
Changing the boundary conditions does not change the vis-
cosity of the fluid, but it does change how the instrument torque 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.  The HA and HB series Viscometers/Rheom-
eters are not supplied with guard legs in order to reduce the potential problems when measuring high
viscosity materials.  HA/HB spindles #3 through #7 are identical to those spindle numbers in the RV
spindle set.  The HA/HB #1 & #2 have slightly different dimensions than the corresponding RV spindles.
This dimensional difference allows the factors between the RV and HA/HB #1&#2 spindles to follow
the same ratios as the instrument torque even though the boundary conditions are different.

The recommended procedures of using a 600 ml beaker and the guard leg are difficult for some cus-
tomers to follow.  The guard leg is one more item to clean.  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.  However, the conversion of this
torque reading to centipoise will only be correct if the factor used was developed for those specific
conditions.  Brookfield has outlined a method for recalibrating a Brookfield Viscometer/Rheometer to
any measurement circumstance in “More Solutions to Sticky Problems”, Section 3.3.10.  It is impor-
tant to note that for many viscometer users the true viscosity is not as important as a repeatable day to
day value.  This repeatable value can be obtained without any special effort for any measurement
circumstance.  But, it should be known that this type of torque reading will not convert into a correct
centipoise value when using a Brookfield factor if the boundary conditions are not those specified by
Brookfield.

The guard leg is a part of the calibration check of the Brookfield LV and RV series Viscometer/Rheom-
eter.  Our customers should be aware of its existence, its purpose and the effect that it may have on data.
With this knowledge, the viscometer user may make modifications to the recommended method of
operation to suit their needs.

LV Guardleg

RV Guardleg

Содержание DV-I+ Series

Страница 1: ...Number of your viscometer Having this information readily available will help us to assist you should there be any questions regarding your instrument Model No Serial No SPECIALISTS IN THE MEASUREMENT...

Страница 2: ...ww ww w 1 17 78 88 8l la ab b c co om m E E m ma ai il l i in nf fo o 1 17 78 88 8l la ab b c co om m L L LA A AB B B O O On n nl l li i in n ne e e E E Ex x xh h hi i ib b bi i it t ti i io o on n n...

Страница 3: ...r C Selection 14 II 7 Out of Range 14 II 8 Operation 15 II 9 Timed Modes for Viscosity Measurement available in instruments with V3 0 or greater 15 Appendix A Cone Plate Viscometer Set Up 20 Appendix...

Страница 4: ...rotating in and the full scale torque of the calibrated spring There are four basic spring torque series offered by Brookfield Spring Torque Model dyne cm milli Newton m LVDV I 673 7 0 0673 RVDV I 7...

Страница 5: ...rrying Case DVE 7Y 1 The following applies to DV I Viscometers with the temperature probe option Look for this symbol throughout this manual for instructions pertaining specifically to DV I Viscometer...

Страница 6: ...1 Emission Standard Light Industrial BSEN 50082 1 Immunity Standard Light Industrial BSEN 50081 2 Emission Standard Industrial BSEN 50082 2 Immunity Standard Industrial BSEN 61010 1 Safety requirement...

Страница 7: ...own on the name plate of the viscometer The DV I must be earth grounded to ensure against electronic failure 7 For Cone Plate models refer to Appendix A I 5 Safety Symbols and Precautions Safety Symbo...

Страница 8: ...OFF SET SPEED SET SPEED Causes the DV I to begin running at the currently selected speed Used for Time to Torque and Timed Stop tests See Section II 9 Timed Modes for Viscosity Measurement AUTO RANGE...

Страница 9: ...y result if cleaned in place Instrument and Keypad Clean with dry non abrasive cloth Do not use solvents or cleaners Immersed Components spindles Spindles are made of stainless steel Clean with non ab...

Страница 10: ...ISCOMETER Figure II 1 After a few seconds the following screen appears BROOKFIELD DV I VERSION 5 0 Figure II 2 No key press is required at this point After a short time the display will clear and the...

Страница 11: ...ified by the number on the side of the spindle nut The DV I requires a Spindle Entry Code number to calculate viscosity values The two digit entry code for each spindle may be found in Appendix D NOTE...

Страница 12: ...ture Display The steps for selecting and accepting a spindle entry are the same as Section II 2 1 except that when SELECT SPINDLE is depressed the temperature display is temporarily replaced by the sp...

Страница 13: ...ecial speed sets To select a viscometer speed first press either the UP or DOWN ARROW keys which will cause the area to the right of RPM on the bottom line to display the currently selected speed Figu...

Страница 14: ...lling operations the DV I will continue to calculate and display viscosity cP and torque II 4 Autorange The AUTO RANGE key allows you to determine the maximum calculated viscosity full scale reading p...

Страница 15: ...n when displaying temperature in the Fahrenheit scale and viscosity display in SI units mPas123 4 70 1 F 10 RPM 89 7 Figure II 11 II 7 Out of Range Brookfield recommends taking viscosity readings betw...

Страница 16: ...ropic materials is discussed in the booklet More Solutions to Sticky Problems and in Appendix C Variables in Viscosity Measurements II 9 Timed Modes for Viscosity Measurement available in instruments...

Страница 17: ...opening screen II 9 2 Timed Stop 1 AfterpressingtheUP ARROW keywheninthedisplayofFigureII 16 theuserispresented with the following screen TIMED STOP SET MIN S 00 Figure II 16 Using the UP and DOWN ARR...

Страница 18: ...will continue until all of the time has elapsed at which point the viscometer will display the following screen cP 123456789 TIMED STOP DONE Figure II 20 At this point the viscometer will stop the mot...

Страница 19: ...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 TORQUE 24 2 MI...

Страница 20: ...s II 25 and II 26 for each press of either the UP orDOWN ARROW key PressinganykeyexcepttheUP or DOWN ARROW keywillcause the viscometer to exit the Timed Torque mode and resume normal operation NOTE Fo...

Страница 21: ...et the Electronic Gap and verify calibration of the DV I Viscometer A 1 ELECTRONIC GAP SETTING FEATURES TOGGLE SWITCH allows you to enable disable the Electronic Gap Setting Feature left posi tion is...

Страница 22: ...st tem perature 3 The Viscometer has been supplied with a special cone spindle s which contains the Electronic Gap Setting feature The CPE part number designation on the cone verifies theElectronicGap...

Страница 23: ...off rotate clockwise until the light is just breaking contact i e flickering 4 Adjust the sliding reference marker right or left to the closest full scale division mark see Figure A 6 5 Turnthemicrom...

Страница 24: ...or the spindle to be utilized 2 Select a Brookfield Viscosity Standard fluid thatwillgiveviscosityreadingsbetween10 and 100 of full scale range Refer to Ap pendixBforviscosityrangesofconespindles rang...

Страница 25: ...00 5350 53500 V 71 HA 1 10 10 100 524 5240 V 72 HA 4 40 40 400 2220 22200 V 73 HA 20 200 200 2000 10700 107000 V 71 HB 4 40 40 400 2096 20960 V 72 HB 16 160 160 1600 8880 88800 V 73 HB 80 800 800 8000...

Страница 26: ...29N SC4 82 37 10 000 73 0 10 000 292 10 000 1 29N SC4 83 121 50 000 243 50 000 970 50 000 1 29N SC4 16 120 400 000 29N SC4 18 3 10 000 1 32N SC4 25 480 1 600 000 22N SC4 31 30 100 000 34N SC4 34 60 2...

Страница 27: ...0 000 40 000 8 000 000 160 000 32 000 000 T E 3 900 1 560 000 50 000 10 000 000 100 000 20 000 000 400 000 80 000 000 T F 7 800 3 120 000 100 000 20 000 000 200 000 40 000 000 800 000 160 000 000 Visc...

Страница 28: ...mes random and the flow can not be analyzed with standard math models This turbulence creates a falsely high viscometer reading with the degree of non linear increase in reading being directly related...

Страница 29: ...different viscosities at different shear rates different RPM s They fall into two groups 1 Time Independent 2 Time Dependent Time Independent means that the viscosity behavior does not change as a fu...

Страница 30: ...ferent shear rates The faster the spindle speed the higher the shear rate The shear rate of a given measurement is determined by the rotational speed of the spindle the size and shape of the spindle t...

Страница 31: ...0 RV7 07 400 HA1 01 1 HA2 02 4 HA3 03 10 HA4 04 20 HA5 05 40 HA6 06 100 HA7 07 400 HB1 01 1 HB2 02 4 HB3 03 10 HB4 04 20 HB5 05 40 HB6 06 100 HB7 07 400 LV1 61 6 4 LV2 62 32 LV3 63 128 LV4 64 640 LV5...

Страница 32: ...que constants for each viscometer model VISCOMETER TORQUE CONSTANT MODEL CODE MODEL TK ON DV I SCREEN LVDV I 0 09373 LV 2 5xLVDV I 0 2343 4L 5xLVDV I 0 4686 5L 1 4 RVDV I 0 25 1R 1 2 RVDV I 0 5 2R RVD...

Страница 33: ...5 8 25cm Height 4 75 12 1cm Note Container may be larger but may not be smaller Temperature As stated on the fluid standard label 0 1 C Conditions The DV I should be set according to the operating ins...

Страница 34: ...Sample Adapter ULAdapter Thermosel or Spiral Adapter 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 p...

Страница 35: ...o step process is recommended for the Thermosel 1 EvaluatethecalibrationoftheViscometeraloneaccordingtotheprocedureoutlinedinthis section entitledCalibrationProcedureforLV 1 4 andRV HA HB 1 7 Brookfie...

Страница 36: ...rd the viscometer reading include and cP m Pas NOTE The spindle must rotate at least five 5 times before a viscosity reading is taken Calibration Procedure for DIN Adapter When a DIN UL Adapter is use...

Страница 37: ...adings are taken 5 Measure viscosity and record the viscometer reading include and cP m Pas Calibration Procedure for Cone Plate Viscometers 1 Follow the procedures outlined in Appendix A for mechanic...

Страница 38: ...ull Scale Viscosity Range cP TK SMC 10 000 RPM Where TK 1 0 from Table D2 SMC 10 from Table D1 Full Scale Viscosity Range 50 000 cP 1 10 10 000 2 The viscosity is accurate to 500 cP which is 1 of 50 0...

Страница 39: ...ithout the guard leg to produce correct results The HA and HB series Viscometers Rheom eters are not supplied with guard legs in order to reduce the potential problems when measuring high viscosity ma...

Страница 40: ...5 1 0 0 5 0 4 1 0 6 4 0 3 0 2 0 1 0 0 5 1 5 7 6 0 4 0 3 0 1 5 0 7 2 0 8 8 0 6 0 4 0 2 0 1 0 2 5 9 10 7 5 5 0 2 5 1 2 3 0 10 20 15 10 5 0 2 5 4 0 11 40 30 20 10 5 0 5 0 12 60 40 30 15 7 5 6 0 13 80 60...

Страница 41: ...ue with a resolutuion of 1 millivolt 0 1 2 This is a 0 4 volt d c output where 0 volts corresponds to 100 C and 4 volts correpsonds to 300 C with a resolution of 1 millivolt 0 1 C Figure G 1 Analog Ou...

Страница 42: ...2 1 2 1 1 1 1 1 1 2 1 OPTIONAL QTY VS 29W VS 29 VS 41Y VS 40Y VS 35 502020032S34Z 50S311824S06B VS 3 VS 2 VS 34 VS 38 1 DESCRIPTION BELLEVILLE SPRING WASHER TENSION INSERT CLAMP SCREW ASSEMBLY GEAR SC...

Страница 43: ...until the bubble is centered from right to left and tighten the clamp knob clockwise Use the leveling screws to fine adjust the viscometer level Note If the Digital Viscometer cannot be leveled check...

Страница 44: ...UPRIGHT ROD 1 2 VS 1 BASE 1 3 VS 3 LEVELING SCREW 3 4 VS 21 JAM NUT 1 5 VS 35 CLAMP 1 6 VS 40Y GEAR SCREW ASSEMBLY 1 7 VS 41Y CLAMP SCREW ASSEMBLY 1 8 VS 29 TENSION INSERT 1 9 VS 29W BELLEVILLE SPRIN...

Страница 45: ...ing The VS 41Y clamp assembly should be positioned so that the word front is facing the operator This will ensure the cut away slot of the clamp assembly will align properly with the machined key ridg...

Страница 46: ...ezing the points shown in Figure I 1 Note All Viscometer Rheometer models except LV use the Probe Clip as shown in Figure I 1 through I 3 Figure I 1 shows the Probe Clip with RTD temperature probe ins...

Страница 47: ...oupling with a 3 56 left hand tap Inspect threads for wear if the threads are worn the unit needs service see Appendix G Check to see if spindles rotate eccentrically or wobble There is an allowable r...

Страница 48: ...Making Mea surements Dial Viscometer Operating Manual Appendix B Viscosity Ranges Dial Viscometer Operating Manual Appendix C Variables in Viscosity Measurement Perform a calibration check Follow the...

Страница 49: ...or service in the United States return to Brookfield Engineering Laboratories Inc 11 Commerce Boulevard Middleboro MA 02346 U S A Telephone 508 946 6200 FAX 508 946 6262 www brookfieldengineering com...

Страница 50: ...ontact with the instrument Do not put lab stand in viscometer carrying case Fill out the Viscometer Information Sheet with as much information as possible to help expedite your service If you do not h...

Страница 51: ...__________ Time Since Last Serviced if known ______ Before After Calibration Check Y N Other Comments _________________________________________________________ ________________________________________...

Страница 52: ...Y TEST REPORT SAMPLE MODEL SPINDLE RPM DIAL READING FACTOR VISCOSITY SHEAR TEMP TIME NOTES TORQUE cP RATE C TEST INFORMATION CONCLUSIONS FOR DATE BY BROOKFIELD ENGINEERING LABORATORIES INC 11 Commerce...

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