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CONTENTS Page Section 2 INTRODUCTION 3 SYMBOLS 3 REAR PANEL 4 BEFORE INSTALLATION 4 INSTALLATION 5 6 CALCULATION KEYS Other Keys 7 8 9 10 11 OPERATION Instrument Set Up Reference Measurement Sample Measurement Printer Output Version 15 15 15 16 16 ACCESSORIES AND CONSUMABLES Selecting the Appropriate Cell UV/Visible Cell Order Information Using Cells Other 17 FACTORS AND FORMULAE 18 18 18 19 MAINTENANCE Cleaning and General Care Fuse Replacement Deuterium Lamp Replacement 20 SPECIFICATIONS Issue 03 - 01/2000 English 1 INTRODUCTION GeneQuant,theRNA/DNAcalculator,isaspectrophotometer designed specificallyformolecularbiologists. The instrument measures RNA and DNA samples in UV cells at 230 nm, 260 nm, 280 nm and 320 nm simultaneously. The wavelengths 260 nm and 280 nm are usedforquantificationandpuritycheckingcalculations,whereas320nmcanbe used for background compensation. 230 nm can be used as a guide for protein determinationusingthepeptidebondabsorbance. Aftereachsamplereadingthe informationisstoredandusedincalculationsuntilthenextreadingistaken. GeneQuantcanbeleftoncontinuouslywithoutaffectingthelifetimeofthelight sourceandthisisrecommendedfortheconvenienceoftheusertoobtainrapid measurements. Thenormalstatusofthelampisstandby modeanditisonly powered up during actual reference and sample measurement using a unique demandswitchingtechnique. (Patentappliedfor). YoucanuseGeneQuanttocalculate: o RNA, ssDNA and dsDNA concentrations in units of weight, molar fraction, molesofphosphateandtotalmolecules o A260/A280 ratio o Totalproteinconcentration o Recoveryofoligonucleotides o Purityofnucleicacids o Meltingtemperature o Molecularweightofoligonucleotides 2 English Issue 03 - 01/2000 SYMBOLS Symbols found in the manual: Instrument Ready PleaseNote sample Warning DisplayPanel Key Press Symbolsfoundontheinstrument: ! Backgroundyellow,symbolblack. Caution-refertoaccompanyingdocuments. REAR PANEL Mains Power Switch "I" = ON "O" = OFF Voltage Selector Cooling Fan Outlet PRINTER LO 100 - 120V HI 200 - 240V Fuse Holder 1.25A T LO 630mA T HI Power Input Socket Issue 03 - 01/2000 Printer Socket (Printer Version Only) English 3 BEFORE INSTALLATION Inspecttheinstrumentforanysignsofdamagecausedintransit. Ifanydamageis apparenttheninformyoursupplierimmediatelyanddonotproceedwiththe installation. Checkthat: o o theinstallationsiteconformstotheenvironmentalconditionsforsafe operation(seeSpecifications). thecoolingfanoutletisnotobstructed. INSTALLATION This equipment must be connected to the power supply with the power supply cord provided and MUST BE EARTHED. Ifthisequipmentisusedinamannernotspecifiedorinenvironmental conditionsnotappropriateforsafeoperation,theprotectionprovidedby the equipment may be impaired and instrument warranty withdrawn. o o o o o o Selectthecorrectvoltageforyourlocalsupply,usingthevoltage selectorontherearpanel. Selecttheappropriatefusesforyourlocalsupply. Twoidentical fuses need to be loaded. For LO 100-120V operation use 2 x 1.25A T fuses and for HI 200-240V operation use 2 x 630mA T fuses. (SeeMaintenanceforfittingfuses). Connectthepowersupplycordtotheinputsocketontherearpanel andtothepowersupply. Switchontheinstrument. Foroptimumlocationofthecell,repositionthespringcliplocated in the sample compartmentby pulling firmlyupwardsand relocatinginappropriatecentralslotsandifyouarenotusing 10mmcellsresetthepathlengthin'setup'. ^Ifyouareusingaprinter,checkthatitisaparallelversionandis switched'on-line'ifnecessary. Ensurethattheprinteroptionsare selectedin'set-up'. ^appliestoprinteroutputversiononly 4 English Issue 03 - 01/2000 CALCULATION KEYS Ensureallparametersin'setup'areappropriateforyoursample. abs ratio RNA DNA todisplayabsorbancereading. Press'select'tocyclethroughthe4wavelengthvalues 230nm, 260nm, 280nm and 320nm. **indicatesthatacellpathlengthof10mmhasnotbeenselected. To convert to corresponding OD values for a 10mm cell, multiply by 2,10or20for5,1and0.5mmpathlengthcells,respectively. todisplayA260/A280 absorbanceratiowithorwithoutbackground correctionat320nm. See'setup'. to display concentrations of RNA, dsDNA or ssDNA. Press'select'tocyclethroughchoiceofunits: Conc 1: µg/ml - range 1 - 4000µg/ml Conc 2: µg/µl-range0.001-0.2µg/µl Conc 3: pmol/µl-range0.001-200pmol/µl (Note: ensurethe+ oligonucleotidelengthandfactor valuearecorrect. See'setup') Conc 4: Phosphateconcentrationpmol-range0.001-0.200pmol protein todisplayproteinconcentrationinmg/ml-range0-600mg/ml. (Note: ensurethecoefficientsarecorrect. See'setup'). [x] todisplaymolecules/ml. (Note: ensurethecorrectmolecularweightisentered. See'setup'). purity todisplaypercentagepuritybycomparingactualratiotoexpected ratio. (Note: ensuretheexpectedratioisentered. See'setup'). recovery tocalculatepercentagerecoverybycomparingactualtoexpected concentration(pmol/µl). (Note: ensuretheexpectedconcentrationandtheoligonucleotide lengthareentered. See'setup'). + doesnotapplytoprinteroutputversion Issue 03 - 01/2000 English 5 Tm tocalculatemeltingtemperature. ^Press'Select'tocyclebetween shortoligonucleotideandprimercalculation. (Note: ensurethatthenumberofbases and^molarityarecorrect. See'setup'). '!!'indicatesthattheequationisnotstrictlyapplicableforthebase numbersused. (SeeFactorsandFormulae). Other Keys factor enter select set ref sample f1 f2 to change factor values for RNA, ssDNA and dsDNA and select thecurrentmodeforcalculations. toenteravalueoroption. tochooseavalueoroptionwithinafunction. tomeasurereference. tomeasuresample. ^toprintoutthelistof'set-up'options. undefined-availableforfuturedevelopment. ^appliestoprinteroutputversiononly 6 English Issue 03 - 01/2000 OPERATION Togetstarted: o switchontheinstrumentattherearpanel Instrument Initialising Note: Instrumentinitialisesforafewseconds. Instrument Ready o o o o select'setup'values. Thisstepcanbeomittedforquickabsorbancereadings setreference insertthecellsothatthelightpathdirectionisinthefront-to-rearaxisofthe instrumentasindicatedbythearrow measure your sample TheinstrumentcanbeuseddirectlyasacalculatorforTmand molecularweightswithoutmeasurementofasample. Asecurityfacilitywhichlockstheinstrumentkeypadisavailable. When'InstrumentReady'oracalculationresultisdisplayed,keyin 4080toswitchfacilityon. Theinstrumentwillthendisplay'Instrument Locked';keyin4080againtounlock. Theinstrumentremainslocked throughpoweroff/on. Calculationkeys,exceptTm,willonlyfunctionafterasample measurementhasbeentaken. Issue 03 - 01/2000 English 7 Instrument Set Up Ifyoukeyinanumberincorrectly,press'C'andstartagain. set-up and enter tostepthrough'setup'optionsandentertheparameters whichrelatetoyoursample. Toexit'setup'pressany calculationkey. Toreturntothebeginning,press'setup'. Thedefaultparametersusedintheinstrumentmaybealteredasfollows: o o o o o o o o o o o o o o o o Cell pathlength (mm). Press 'select' to choose from: 0.5 1 5 10. ^Printer. Press'select'tochoosefromON/OFF. Press'enter'. ^Samplenumber. Keyintherequired number. Press 'enter'. Thesamplenumberincrementsautomaticallyeachtimethesampleis measured. ^Date. Keyinthedate. Press'enter'. (Adjustthisdaily). ^Month. Selectappropriatemonth. Press'enter'. ^Year. Keyintheyear. Press'enter'. Backgroundcompensation320nm. Press'select'tochoosefrom: YES/NO. ^Dilute? Keyinthedilutionfactorforconcentrationcalculation. Range1.00-99999.9. Factor. Press 'select' to choose from: RNA dsDNA ssDNA. ForsyntheticoligonucleotidesusessDNAandkeyinnewfactorsifdefaults arenotsuitable.Press'enter'. Bases. Key in the number of A C G T U to calculate molecular weight frombasecompositionofnucleicacidsandtoshowresultsasmolecules/ml. Press'enter'tocyclethroughthebases. Range0-1000. Oligolength. + Keyintheoligonucleotidelengthofthesampleinbaseunits toshowresultsaspmol/µl. Press'enter'. Range1-9999. Molecularweight(MW). Press'select'tochoosebetweenthecalculated value(fromA,C,G,T,Unumbers)oruser-enteredvalueformolecular weight(ifknown). Press'enter'. Ratio. KeyintheA260/A280 absorbanceratioexpectedforyoursample(if known). Press'enter'. Concentration. Keyintheconcentrationexpected(inpmoles/µl)foryour sample(ifknown). Press'enter'. Protein. Keyincoefficientsforequationiftheyaredifferenttodefaults. (SeeFactorsandFormulae). ^Molarity. Keyinmolarityofsaltsinhybridisationsolution. ^appliestoprinteroutputversiononly + doesnotapplytoprinteroutputversion 8 English Issue 03 - 01/2000 Reference Measurement Takeareferencereading. Thisreadingisstoredandusedasthebasereadingfor allsamplemeasurementsuntilanewreferencereadingistaken. Ifyoudonotinsertand removethesamplecell intime,thedisplaywill show: 1. Remove Cell Press Key Again set ref Please Wait 2. Waitforthetoneandinsert thereferencecellintothe samplecompartment: Insert Reference 3. Wait for the tone and remove thereference: Remove Reference 4. After you have removed the referencethedisplaywillshow: ABSORBANCE 260 nm 0.000 AU Whenusingthecapillarycellandholder,placetheholderinthesample compartmentbeforetakingmeasurements. Then insertand removethe capillaryasabove. Issue 03 - 01/2000 English 9 Sample Measurement You can now measure a sample. A similar procedure is followed to the one used formeasuringareference. Usethe'sample'keyinsteadof'setref'. Ensurecorrectcellpathlengthandsampletypehavebeenselectedin'setup'. 1. sample Please Wait or ^ Date 23 Aug 1993 Sample No. 9164 2. Waitforthetoneand insertthesamplecellinto thesamplecompartment: Insert Sample 3. Waitforthetoneand removethesamplecell: Remove Sample 4. Afterthefirstsample, thedisplaywillshow absorbanceat260nm: ABSORBANCE 260 nm 1.000 AU 'Absorbance**'indicatesthata10mm pathlengthcellhasnotbeenselected. (See'setup'). Storedreadingscannowbemanipulatedusingthecalculationkeys. Forsubsequentsamplesthedisplaydefaultstothepreviousfunction used. Thisfacilityprovidesusefulsinglekeyoperationifyourequirethesame typeofmeasurementonsuccessivesamples. Operationofthe'sample' keyautomaticallydisplaystheresultaftersamplemeasurement. ^displayedonprinteroutputversiononly 10 English Issue 03 - 01/2000 Printer Output Version Thissectionshouldbereadinadditiontothedetailsgivenintheprevioussections. Installation o o Connecttheprinterviaitsinterfacecabletothesocketontherearpanelofthe instrument. Switchontheprinterandensureitison-line. Operation Thesamplenumberanddatearestoredpermanentlyuntilaltered. Samplenumberisincrementedautomaticallyeachtimeasampleis measured. Thedatedoesnotincrementautomatically. Ifyoudonotwishtoalteranyfurtherparametersin‘setup’,takereference readingsandsamplemeasurementsasdescribedpreviously. Thedisplaysand printoutsappearasshownbelow(whentheprinteroptionin'setup'issetto'on', printoutsofthedisplayoccurautomatically). Afteryouhaveremovedthereference: ABSORBANCE 260 nm 0.000 AU Absorbance 260 nm 0.000 AU select ABSORBANCE 280 nm 0.000 AU Absorbance 280 nm 0.000 AU Theremainingabsorbancevaluescanbeprintedoutinthesameway. Issue 03 - 01/2000 English 11 When a sample is measured: sample Date 23 Aug 1993 Sample No. 9164 Operator _______ Date 23 Aug 1993 Sample No. 9164 Insert Sample Remove Sample ABSORBANCE 260 nm 0.957 AU Absorbance 260 nm 0.957 AU RNA DNA dsDNA CONC 1 47.9 µg/ml dsDNA CONC 1 47.9 ug/ml Ifrequiredpress‘select’tocyclethroughandprintouttheotherchoicesofunits. Othercalculationsareprintedoutautomaticallywhentheappropriatekeyis pressed. Theinstrumentfacilitatesroutineanalysisasthedisplayandprintout alwaysshowtheselectedparametersautomaticallyaftera measurement,as shownin theexampleson the followingpage. Iftheprinterisswitchedofforoff-lineduringusewhileselected‘on’in‘setup’ andakeyispressed,thedisplayshows: Printer off-line Press any key Normalfunctioningresumesafteranykeyispressed. Iftheprinterisswitchedon again,normalprintingresumes. Iftheprinterremainsoff,theprinteroptionin'set up'isautomaticallysettooff. 12 English Issue 03 - 01/2000 Examples: 'setup'options GeneQuant Path Length Printer Sample No. Date Month Year Use 320 nm Dilute? FACTOR ssDNA? BASES Number Number Number Number Number SETUP 10 ON 507 18 Jan 1993 NO 1.00 37.0 A? C? G? T? U? OLIGO Length 5 5 2 1 1 CONCENTRATION Expected? Routineanalysis ofproteins Operator________ Date 18 Jan 1993 Sample No. 0505 Operator________ Date 23 Feb 1993 Sample No. 8273 ssDNA CONC 1 29.3 ug/ml PROTEIN CONC 0.7 mg/ml ssDNA CONC 2 0.029 ug/ul Operator________ Date 23 Feb 1993 Sample No. 8274 ssDNA CONC 3 0.197 pmol/ul Phosphate CONC 0.093 pmol RATIO 1.997 PURITY 99% 13 MOLECULAR WEIGHT CALC 3961.6 RATIO Expected? Completelistof calculationsfora nucleotide PROTEIN CONC 0.4 mg/ml Operator________ Date 23 Feb 1993 Sample No. 8275 PROTEIN CONC 1.5 mg/ml RECOVERY 98% Operator________ Date 23 Feb 1993 Sample No. 8276 MOLECULES/ML 4.459395 Exp 15 PROTEIN CONC 3.8 mg/ml MELTING TEMP 40 C Operator________ Date 23 Feb 1993 Sample No. 8277 1.800 2.000 MELTING TEMP PRI 48.5 C PROTEIN Coeff 1? Coeff 2? 1.550 0.760 Molarity 0.100 PROTEIN CONC 32.2 mg/ml Operator________ Date 23 Feb 1993 Sample No. 8278 PROTEIN CONC 0.2 mg/ml Issue 03 - 01/2000 English 13 Parallel Printer Interface Specifications: Datatransmission: Synchronisation: 8bitparallel Timingforattachedprinterisprovidedbyexternalstrobe signals. Handshakeprotocol: By BUSY and ~STROBE signals. Signallevels: Thelevelsofoutputdataandinterfacecontrolsignalsareall TTLcompatible. Interface Connector Theprinterinterfaceisastandard25-pinD-shellfemaleconnector. Thedatalines (D0-D7) on the connector are driven by drivers capable of sourcing 15mA and sinking 24mA. PinNo. 1 2 3 4 5 6 7 8 9 10 11 12-17 18-25 14 I/O O O O O O O O O O I I N/A N/A Signal Name ~STROBE DataBit0 DataBit1 DataBit2 DataBit3 DataBit4 DataBit5 DataBit6 DataBit7 ~ACK BUSY Unconnected Ground English Issue 03 - 01/2000 ACCESSORIES AND CONSUMABLES Selecting the Appropriate Cell GeneQuant has a suitable measuring range between 0.1 to 2.5 OD for a 10mm pathlengthcell. Chooseasuitablecelldependingonsampleconcentrationrange, dilutionfactorandavailablesamplevolume. Pathlength,mm Suitable Sample OD260 range µg/ml) given that Concentration range (µ µg/ml for dsDNA 1.0 OD260 = 50µ 10 5 1 0.5 2.5-0.1 5-0.2 25-1.0 50-2.0 125 - 5 250 - 10 1,250-50 2,500-100 UV/Visible Cell Order Information Pathlength and Description Minimum Sample Volume Part Number 10mm,standardcellwithlid 10mm,semimicro cellwithlid 10mm,microcellwithlid 10mm,ultramicrovolumecell 2,000µl 500µl 250µl 70µl 80-2002-58 80-2002-77 80-2002-95 80-2103-69 5mm,standardcellwithlid 5mm,ultramicrovolumecell 1,000µl 5µl 80-2002-57 80-2103-68 1mm,standardcellwithlid 200µl 80-2002-54 0.5mm,quartzcapillarycell (includes100capillaries) Sparequartzcapillaries(100) 3µl 80-2104-66 3µl 80-2104-67 Issue 03 - 01/2000 English 15 Using Cells Ensurethatthecellfacesarecleanbeforemeasurement. Afterusecellsshouldbe cleanedwithadilutealkali(e.g.0.1MNaOH)andadiluteacid(e.g.0.1MHCl) wash,followedbyrinsingseveraltimeswithdistilledwater. Morerigorous cleaningafterdifficultsamplesshouldbeperformedwithasuitableliquid detergent,followingthemanufacturer'sinstruction. The0.5mmquartzcapillaryisfilledbydippingintothesample. Afteruse,itcan beemptiedusingaPasteurpipettebulbattachedtonarrowboresiliconetubing. Thequartzcapillarycellcanbedismantledforcleaningandremovingabroken capillarybyunscrewingthetwoscrewsoneachsideusingthetoolprovided. Instructionsareprovidedwiththe0.5mmquartzcapillaryand5mmultra microvolumecells. Other GeneQuant GeneQuant(printerversion) GeneQuant II Deuterium lamp GeneQuant User Manual GeneQuant II User Manual Dust Cover ParallelInterfaceCable(Centronics) IntroductiontoBasicUV/VisibleSpectrophotometry 16 English 80-2103-98 80-2104-98 80-2105-98 80-2104-56 80-2105-20 80-2105-58 80-2105-18 80-2071-87 80-2005-60 Issue 03 - 01/2000 FACTORS AND FORMULAE o Grams(g)areconvertedtomolesusing309(theaveragemolecularweightof the ATCG bases) o Factorsformolecularweights(MW)ofbases:A=312.2 C=288.2 G=328.2 T=303.2 U=289.2 o Fordephosphorylatedoligonucleotidessubtract61fromthecalculatedMW o Forphosphorylatedoligonucleotidesadd17tothecalculatedMW o A260 xfactor=µg/mlconcentration Default factors are: 40 for RNA, 37 for ssDNA, 50 for dsDNA ForsyntheticoligonucleotidesusessDNAmodeandchangefactor o A260/A280 ratios are 1.8 and 2.0 for pure DNA and RNA preparations, respectively. o pmol/µl= o pmolphosphate=Nucleotideconcentration,µg/ml 315 o Molecules/ml= concentration,µg/mlx6.023x1023 MW x 106 o Protein (mg/ml) = 1.55 x (A280 - A320) - 0.76 x (A260 - A320) µg/ml x 1000 309xoligolength ^ pmol/µl = µg/ml x 1000 M W Coefficients1and2(defaults1.55and0.76,respectively)canbechangedfor differentproteins o Tm 1 (for short oligonucleotides) = 2 (nA + nT) + 4 (nG + nC), n refers to numberofindividualbaseunits-equationisvalidlinearlyfrom10to18mer, but may be used as a guideline for values above 18 mer. o ^ Tm primers = 81.5 + 16.6 (log molarity) + 0.41(%guanosine+cytosine)-500/primerlength Equation is valid from 14 to 60 mer ^appliestoprinteroutputversiononly Issue 03 - 01/2000 English 17 MAINTENANCE Observeallnecessaryprecautionsifdealingwithhazardoussamplesor solvents. Usermaintenanceisrestrictedtochangingtheinstrumentlamp,changingexternal fusesandinstrumentcleaning. Foranyothermaintenanceoperationcontactyour localsupplier. Cleaning and General Care ExternalCleaning: o o o Switchofftheinstrumentanddisconnectthepowersupplycord. Useasoftdampclothtocleanallexternalsurfaces. Amild liquid detergent (e.g. Decon) may beused toremove stubborn marks. SampleCompartmentSpillages: o o o o o Switchofftheinstrumentanddisconnectthepowersupplycord. Thesamplecompartmentiscoatedinachemicalresistantfinish. However, strongconcentrationsofsamplemayaffectthesurfaceandspillagesshouldbe dealtwithimmediately. Asmalldrainholeinthesamplecompartmentallowsexcessliquidtodrain awayontothebenchortablefromundertheinstrument. Use a soft dry cloth to mop out the sample compartment. Reconnectthepowersupplycordandswitchontheinstrument. Fuse Replacement Selecttheappropriatefusesforyourlocalsupply. Twoidenticalfusesneedtobe loaded. For LO 100-120V operation use 2 x 1.25A T fuses and for HI 200-240V operation use 2 x 630mA T fuses. o o o o o 18 Switchofftheinstrumentanddisconnectthepowersupplycord. Thefuse holder can only be opened if the power supply plug has been removed. Thefuseholderislocatedbetweenthepowerinputsocketandtheon/off switchonthebackpaneloftheinstrument. Slideopenthefuseholderbypullingatthenotch. Placefusesintothefuseholderandslidebackintoposition. Reconnectthepowersupplycordandswitchontheinstrument. English Issue 03 - 01/2000 Deuterium Lamp Replacement Replacementlampsareavailablefromyourlocalsupplier. Thedeuteriumlampbecomesveryhotinuse,soallowatleast10 minutesbeforechanging. Careshouldbetakennottotouch theoptical surfaceofthenewlampwithyourfingers;iftouched,theareashouldbe cleanedwithmethanol. o o o o o o o o Switchofftheinstrumentanddisconnectthepowersupplycord. Releasetheinstrumentcoverbyunscrewingthesevenscrewsinthebase. Carefullylifttopcoverupwards,tiltandplaceontherightsideofthe instrumenttakingcarenottodamagetheribboncables. Depresscatch'A'andliftconnectorawayfromcircuitboard. Remove two screws 'B'. Lift deuterium lamp andbracket assembly away from mounting plate. Placenewdeuteriumlampandassemblyintoposition,locatingpins'C'into holesandslotinmountingplate. Refittwoscrews'B'andtighten. Refitconnector'A'pushingdownwardsuntilthecatchsnapsshut. Refittheinstrumenttopcover,takingcarenottotraptheribboncable. Refitthesevenscrewsinthebase. Reconnectthepowersupplycordandswitchontheinstrument. Issue 03 - 01/2000 English 19 SPECIFICATIONS Lightsource Wavelength range Wavelengthcalibration Wavelengthaccuracy Wavelengthreproducibility Bandwidth Straylight Photometricreproducibility Photometricrange Photometriclinearity Cell size accommodated Dimensions Weight Environmentalconditions Safetystandard EMC standard Qualitysystem DigitalOutput Electricalspecifications Externalfuseratings Internalfuseratings VA rating Voltage Frequency Deuterium arc lamp Fixed at 230, 260, 280 and 320 nm Factoryset ±2 nm Betterthan±0.1nm 5 nm Less than 0.1%T at 320 nm with NaNO2 0.5% of Abs reading or 5mA which ever is the greater 0 to 3.000 Abs ±1% of reading or ± 0.005 A to 3 A, whichever isthegreater 0.5mmpathlengthcapillarycell 1 mm, 5 mm and 10 mm pathlength standardcell 270 (w) x 320 (d) x 130 (h) 3.5kg Indoor use only, away from inflammable materials Temperature 5 oC to 40 oC Maximum relative humidity 80 % up to 31 oC decreasinglinearlyto50%at40oC InstallationCategoryII IEC 1010 CISPR 22 Designedand manufacturedin accordancewith an ISO 9001 approved quality system Centronicsparalleloutput(printerversiononly) 100-120V - 1.25 A T 200-240V - 630 mA T F101 - 3.15 A T F102 - 2 A T 100 VA 100 - 120 V + 10 % 200 - 240 V 50/60 Hz } Specificationsaremeasuredaftertheinstrumenthaswarmedupatconstant ambienttemperatureandaretypicalofaproductionunit. Aspartofourpolicyofcontinuousdevelopmentwereservetherighttoalter specificationswithoutnotice. 20 English Issue 03 - 01/2000