DR101-60
Asanentry-levelmodelindigitalrefractometry,theDR101-60coversmany
areasofapplicationwherethewidemeasurementrangeoftheDR201-95
isnotrequired.Itoffersexcellentvalueformoney,intermsofbothprocure-
ment and operation. Calibration is also with distilled water.
ThewaterproofcaseallowstheDR101-60toberinsedunderrunningwater.
Thisdigitalhandheldrefractometeralsohasanautomatictemperature
compensationfeature,ofcourse.
Prism cover
Stainless steel
sample plate
Keypad
Prism
LCD-Display
Scale´s unit
READ key to start measuring
SCALE key to chose the scale´s unit
ZERO Calibration key
Calibration:
Calibrationshouldbeperformedonadailybasisforoptimumresultsand
accuracy.Forthebestresults,performcalibrationinacontrolledenvironment
of20°C(68°F)usingdistilledwaterofthesametemperature.Itisrecom-
mended to allow the instrument and the distilled water to reach temperature
equilibriumwiththecontrolledenvironmentbeforecalibrationtakesplace.
Applyafewdropsofsampleontheprismwithapipette.PresstheZEROkey
for3seconds.Whencalibrationiscomplete,“CAL”willbeshownontheLCD
display.TochecktheRIvalueofthezerosettingforthedistilledwater,press
quicklytheZEROkey,once.Thisdatacanbeviewedatanytimetoshowthe
last calibration value.
Whencalibrationiscomplete,gentlywipetheprismusingtissuepaper.
Automatic Temperature Compensation (ATC):
Automatictemperaturecompensationinsurethatconcentrationreadingof
aqueous(water-based)solutionswillbeaccuratewithrespecttothesample’s
temperature.Thisdigitalrefractometerisabletocorrectautomaticallyfordiffe-
rencesinthetemperatureofthesampletoareferencetemperature,usually
20°C.Itiswellknownthatsubstantiallyallmaterialsexpendwhenheated
(become less dense) and contract when cooled (become more dense).
Thespeedoflightinaliquidincreaseswithtemperature,andtherefractive
indexthereforedecreases.Althoughthisthermaleffectissmallforsolids,
thechangeindensityforliquidsissubstantial.Forexample,thereadingfora
sucrosesolutionwillchangebyapproximately0.5Brixforeach10°C(5°F)
changeintemperature.Soa10Brixsolutionreadat42°C(108°F)would
read8Brixonanon-temperaturecompensatedinstrument.
Function Remarks
READ
Power:
Theinstrumentisswitchedon
bypressingtheREADkey.At
thesametime,thetemperature
displaysontheLCD.
Therefractometerwillbeshutoff
after30secondsofnon-use.
Whenalarmofbatterydisplays
ontheLCD,replacewithanew
battery.
Measurements:Applyafewdrops
of sample on the prism with a
pipette.PresstheREADkey.Within
1second,thevalueisshownon
theLCDdisplay.
Forthebestresults,
gentlycleanandwipetheprism
with distilled water and tissue
paper.
ZERO
Zero-Check:PressingZEROkey
quicklytoperformzero-check
function.
DisplaysthenDvalueofthe
solution.
Calibration:PressingZEROkey
toperformazerocalibration.To
eliminateaccidentalcalibrations,
thekeymustbepressedfor
3 seconds.
SCALE
ActiveSCALE:Thescalescan
be switched between Brix and
RefractiveIndexresp.Refractive
IndexandOechsledegreeby
pressingtheSCALEkeyuntilthe
desiredscaleisshownbythescale
indicator at the bottom section of
theLCDdisplay.
DR101-60:
Scale‘sunitsforBrixandRI
DR201-95:
Scale‘sunitsforBrixandRI
DR201-95OE:
Scale‘sunitsforRIandOechsle
DR201-95 and DR201-95OE
TheDR201-95isacompactdigitalhandheldrefractometerwhichelimi-
natesanyuser-relatedreadingerrorsofmanualhandheldrefractometers.
Speciallydevelopedforfastandeasyqualitycontrolandprocesscontrol,
ithasawidemeasuringrangeforarefractiveindexscaleandasugar
scale.OneDR201-95canthusoftenreplaceseveralexistinginstruments.
Forwine-growing,aspecialmodelisavailablewithanOechslescale
insteadofasugarscale.Bothinstrumentsarelow-maintenanceandare
calibratedsimplywithdistilledwater.The1.5Vbatterylastsforover
1000 measurements.
Prism cover
Stainless steel
sample plate
Keypad
Prism
LCD-Display
Scale´s unit
READ key to start measuring
SCALE key to chose the scale´s unit
ZERO Calibration key