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kruss DR101-60 Operating instructions

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A. KRÜSS Optronic GmbH
Alsterdorfer Str. 276–278 ∙ 22297 Hamburg / Germany
Fon +49-(0)40-514317-0 ∙ Fax +49-(0)40- 514317-60
Email: info@kruess.com ∙ www.kruess.com
Version 1.0 | State: Nov 2011 | Subject to technical modification without notice / errors and omissions excepted
Digital Handheld Refractometers
DR101-60 | DR201-95
Operating Manual
Precautions:
• Pleaseusetheinstrumentonlywithintheoperatingtemperatureof
18–35 °C (65–95 °F).
• Thisrefractometerisanelectronicinstrument,itcanbecomedamagedif
droppedorhandledinaroughmanner.
• Theprismismadeofopticalglassandissusceptibletoscratches.
Donotapplyanyroughorabrasivematerialandtakecarewhencleaning
the prism.
• Aftereachuse,cleantheprismandtheprismassemblywithasoftclothor
tissuesoakedinwater,andwipeoffwithadyclothortissue.
• Donotholdtherefractometerunderastreamofwaterfromafaucet.
Do not splash it with or dip it in water.
• Ifthesurfaceoftheprismbecomescoatedwithanoilysolutionorsimilar,
itwillrepeltestsampleandaffectreadings.Ifthisoccurs,theprismshould
becleanedwithaweakeneddetergentorsimilarsolvent.
• Donotusetheinstrumentunlessyouknowhowtocalibrate.
Survey of models
Model / Article-No. DR101-60 DR201-95 DR201-95-OE
Measurement range
1.3330–1.4419 nD
0–60 %Brix
1.3330–1.5318 nD
0–95 %Brix
0–250 °Oechsle
0–95 %Brix
Accuracy
0.0005 nD
0.25 %Brix
0.0003 nD
0.2 %Brix
1 °Oechsle
0.2 %Brix
Resolution
0.0001nD
0.1 %Brix
0.0001nD
0.1 %Brix
1 °Oechsle
0.1 %Brix
Temperature-
measurement
0–40 °C 0–40 °C 0–40 °C
Temperature-
accuracy
0.5 °C 0.5 °C 0.5 °C
Temperature-
compensation
10–40 °C 10–40 °C 10–40 °C
Prism opticalglass
Case plastic
Dimensions 110 x 62 x 32 mm 130 x 80 x 40 mm
Weight 160g 200g
Power supply 1.5 V batterie 1.5 V batterie
en
DR101-60
Asanentry-levelmodelindigitalrefractometry,theDR101-60coversmany
areasofapplicationwherethewidemeasurementrangeoftheDR201-95
isnotrequired.Itoffersexcellentvalueformoney,intermsofbothprocure-
ment and operation. Calibration is also with distilled water.
ThewaterproofcaseallowstheDR101-60toberinsedunderrunningwater.
Thisdigitalhandheldrefractometeralsohasanautomatictemperature
compensationfeature,ofcourse.
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:
Calibrationshouldbeperformedonadailybasisforoptimumresultsand
accuracy.Forthebestresults,performcalibrationinacontrolledenvironment
of20°C(68°F)usingdistilledwaterofthesametemperature.Itisrecom-
mended to allow the instrument and the distilled water to reach temperature
equilibriumwiththecontrolledenvironmentbeforecalibrationtakesplace.
Applyafewdropsofsampleontheprismwithapipette.PresstheZEROkey
for3seconds.Whencalibrationiscomplete,“CAL”willbeshownontheLCD
display.TochecktheRIvalueofthezerosettingforthedistilledwater,press
quicklytheZEROkey,once.Thisdatacanbeviewedatanytimetoshowthe
last calibration value.
Whencalibrationiscomplete,gentlywipetheprismusingtissuepaper.
Automatic Temperature Compensation (ATC):
Automatictemperaturecompensationinsurethatconcentrationreadingof
aqueous(water-based)solutionswillbeaccuratewithrespecttothesample’s
temperature.Thisdigitalrefractometerisabletocorrectautomaticallyfordiffe-
rencesinthetemperatureofthesampletoareferencetemperature,usually
20°C.Itiswellknownthatsubstantiallyallmaterialsexpendwhenheated
(become less dense) and contract when cooled (become more dense).
Thespeedoflightinaliquidincreaseswithtemperature,andtherefractive
indexthereforedecreases.Althoughthisthermaleffectissmallforsolids,
thechangeindensityforliquidsissubstantial.Forexample,thereadingfora
sucrosesolutionwillchangebyapproximately0.5Brixforeach10°C(5°F)
changeintemperature.Soa10Brixsolutionreadat42°C(108°F)would
read8Brixonanon-temperaturecompensatedinstrument.
Function Remarks
READ
Power:
Theinstrumentisswitchedon
bypressingtheREADkey.At
thesametime,thetemperature
displaysontheLCD.
Therefractometerwillbeshutoff
after30secondsofnon-use.
Whenalarmofbatterydisplays
ontheLCD,replacewithanew
battery.
Measurements:Applyafewdrops
of sample on the prism with a
pipette.PresstheREADkey.Within
1second,thevalueisshownon
theLCDdisplay.
Forthebestresults,
gentlycleanandwipetheprism
with distilled water and tissue
paper.
ZERO
Zero-Check:PressingZEROkey
quicklytoperformzero-check
function.
DisplaysthenDvalueofthe
solution.
Calibration:PressingZEROkey
toperformazerocalibration.To
eliminateaccidentalcalibrations,
thekeymustbepressedfor
3 seconds.
SCALE
ActiveSCALE:Thescalescan
be switched between Brix and
RefractiveIndexresp.Refractive
IndexandOechsledegreeby
pressingtheSCALEkeyuntilthe
desiredscaleisshownbythescale
indicator at the bottom section of
theLCDdisplay.
DR101-60:
Scale‘sunitsforBrixandRI
DR201-95:
Scale‘sunitsforBrixandRI
DR201-95OE:
Scale‘sunitsforRIandOechsle
DR201-95 and DR201-95OE
TheDR201-95isacompactdigitalhandheldrefractometerwhichelimi-
natesanyuser-relatedreadingerrorsofmanualhandheldrefractometers.
Speciallydevelopedforfastandeasyqualitycontrolandprocesscontrol,
ithasawidemeasuringrangeforarefractiveindexscaleandasugar
scale.OneDR201-95canthusoftenreplaceseveralexistinginstruments.
Forwine-growing,aspecialmodelisavailablewithanOechslescale
insteadofasugarscale.Bothinstrumentsarelow-maintenanceandare
calibratedsimplywithdistilledwater.The1.5Vbatterylastsforover
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
/