Brookfield DV2+Pro Viscometer Manual de usuario Pagina 80

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Brookeld Engineering Labs., Inc. Page 80 Manual No. M03-165-F0612
Brookeld Viscosity Standard Fluid General Information
We recommendthatBrookeldViscosityStandardFluidsbereplacedonanannualbasis,one
yearfromdateofinitialuse.Theseuidsarepuresiliconeandarenotsubjecttochangeover
time. However, exposure to outside contaminants through normal use requires replacement on
an annual basis. Contamination may occur by the introduction of solvent, standard of different
viscosity or other foreign material.
Viscosity Standard Fluids may be stored under normal laboratory conditions. Disposal should be
inaccordancewithstate,localandfederalregulationsasspeciedonthematerialsafetydatasheet.
BrookeldEngineeringLaboratoriesdoesnotrecertifyViscosityStandardFluids.Wewillissue
duplicatecopiesoftheCerticateofCalibrationforanyuidwithintwoyearsofthepurchase
date.Brookeld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uidisnormallydiscarded.
Calibration Procedure for LV #1-3 (#61-63) and RV, HA, HB #1-6 Brookeld Spindles
Please note that the LV #4 (64) and RV, HA, HB #7 (07) spindles have been omitted from this
procedure. Brookeld does not recommend the use of these spindles to perform a calibration
check on your instrument. Reasons pertain to the small amount of spindle surface that
makes contact with the viscosity standard, the difculty of establishing the immersion mark
precisely and the need for precise temperature control at 25°C in the immediate vicinity of
the spindle.
Followthesestepsusingoneoftherecommendedspindlestoverifycalibrationonyourinstrument:
1) Placetheviscositystandarduid(inthepropercontainer)intothewaterbath.
2) Lower the DV-II+Pro into measurement position (with guard leg if LV or RV series
Viscometer is used).
3) Attach the spindle to the Viscometer. If you are using a disk-shaped spindle, avoid trapping
airbubblesbeneaththediskbyrstimmersingthespindleatanangle,andthenconnecting
it to the Viscometer.
4) Theviscositystandarduid,togetherwiththespindle,shouldbeimmersedinthebathfor
aminimumof1hour,stirringtheuidperiodically,priortotakingmeasurements.
5) After 1 hour, check the temperature of the viscosity standard uid with an accurate
thermometer.
6) Iftheuidisattesttemperature(±0.1°Cofthespeciedtemperature,normally25°C),
measure the viscosity and record the Viscometer reading.
Note: The spindle must rotate at
least ve (5) times before readings are taken.
7) The viscosity reading should equal the cPvalueontheuidstandardtowithinthecombined
accuracies of the Viscometer and the viscosity standard (as discussed in the section entitled,
Interpretation of Calibration Test Results) which appears later in this section.
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