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1、InternationalStandardISO4112Thirdedition2025-06CerealsandpulsesGuidanceonmeasurementofthetemperatureofgrainstoredinbulkCerealesetIegumineusesDirectivesgeneratespourIemesuragedelatemperaturedesgrainsentreposesenvracdanslesinstallationsdestockageReferencenumberISO4112:2025(en)COPYRIGHTPROTECTEDDOCUMEN
2、TISO2025Allrightsreserved.Unlessotherwisespecified,orrequiredinthecontextofitsimplementation,nopartofthispublicationmaybereproducedorutilizedotherwiseinanyformorbyanymeans,electronicormechanical,includingphotocopying,orpostingontheinternetoranintranet,withoutpriorwrittenpermission.Permissioncanbereq
3、uestedfromeitherISOattheaddressbeloworISO,smemberbodyinthecountryoftherequester.ISOcopyrightofficeCP401Ch.deBlandonnet8CH-1214Vernier,GenevaPhone:+41227490111Email:copyrightiso.orgWebsite:www.iso.orgPublishedinSwitzerlandPageContentsForewordIntroduction.2 Normativereferences13 Termsanddefinitions14
4、Principle15 Apparatusandsystem26 Procedure36.1 Positioningthemeasuringpoints36.1.1 Graintemperaturesensors36.1.2 Warehousetemperaturesensors36.1.3 Airtemperaturesensors36.2 Temperaturereadings46.2.1 Frequencyofreadings46.2.2 Particularrequirementsforventilatedwarehouses47 Temperaturerecords47.1 Gene
5、ral47.2 Calibration4Annex A (informative)Temperature-readingdevices5Annex B (informative)Layoutoftemperaturemeasuringpoints6ForewordISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(ISOmemberbodies).TheworkofpreparingInternationalStandardsisnormallyca
6、rriedoutthroughISOtechnicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhastherighttoberepresentedonthatcommittee.Internationalorganizations,governmentalandnon-governmental,inliaisonwithISO,alsotakepartinthework.ISOcollaboratescloselywiththeInternationalE
7、lectrotechnicalCommission(IEC)onallmattersofelectrotechnicalstandardization.TheproceduresusedtodevelopthisdocumentandthoseintendedforitsfurthermaintenancearedescribedintheISO/IECDirectives,Part1.Inparticular,thedifferentapprovalcriterianeededforthedifferenttypesofISOdocumentshouldbenoted.Thisdocumen
8、twasdraftedinaccordancewiththeeditorialrulesoftheISO/IECDirectives,Part2(seeWWW.iso.org/directives).ISOdrawsattentiontothepossibilitythattheimplementationofthisdocumentmayinvolvetheuseof（八）patent(三).ISOtakesnopositionconcerningtheevidence,validityorapplicabilityofanyclaimedpatentrightsinrespectthere
9、of.Asofthedateofpublicationofthisdocument,ISOhadnotreceivednoticeof（八）patent(三)whichmayberequiredtoimplementthisdocument.However,implementersarecautionedthatthismaynotrepresentthelatestinformation,whichmaybeobtainedfromthepatentdatabaseavailableatWWW.iso.org/patents.ISOshallnotbeheldresponsibleforid
10、entifyinganyorallsuchpatentrights.Anytradenameusedinthisdocumentisinformationgivenfortheconvenienceofusersanddoesnotconstituteanendorsement.Foranexplanationofthevoluntarynatureofstandards,themeaningofISOspecifictermsandexpressionsrelatedtoconformityassessment,aswellasinformationaboutISOsadherencetot
11、heWorldTradeOrganization(WTo)principlesintheTechnicalBarrierstoTrade(TBT),seewww.iso.org/iso/foreword.htmLThisdocumentwaspreparedbyTechnicalCommitteeISO/TC34,Foodproducts,SubcommitteeSC4,Cerealsandpulses.Thisthirdeditioncancelsandreplacesthesecondedition(ISO4112:1990),whichhasbeentechnicallyrevised.
12、Themainchangesareasfollows: thetermwarehouseanditsdefinitionhavebeenadded; theapparatusfortemperaturemeasurementhavebeenmodified; thetemperaturesensorsandthermometricsystemforstoredgrainhavebeenadded; thelayoutOftemperaturemeasurementpointshasbeenmodified; thewirelesscommunicationtechnologyandnetwor
13、kingtechnologyhavebeenadded;Anyfeedbackorquestionsonthisdocumentshouldbedirectedtotheusersnationalstandardsbody.Acompletelistingofthesebodiescanbefoundatwww.iso.org/members.html.IntroductionGrainstorageplaysacrucialroleinensuringfoodsecurity.Thephysiologicalprocesseswhichoccurwithinamassofstoredgrai
14、nareaccompaniedbytheemissionofheat,andtheexternalenvironmentalfactors(e.g.hotclimate,ventilation)canalsocausegraintemperaturechangesinbulkstorage.Asaresult,thetemperatureofthegraincanreachalevelatwhichseriouspermanentdeteriorationinthecommercial,technologicalandfoodpropertiesofthegrainwilltakeplace.
15、Itisthereforenecessarytodetectandmeasureanyoverheatingduringstorageandtotakeimmediateremedialmeasures,suchasventilationandcooling,sincelateremedialmeasureswill,inmostcases,havenoeffect.Inbulkstorage,suchdamageisoftenintheinitialstages,localizedandaffectsonlyasmallproportionofthegrainstored.However,s
16、uchdamage,althoughlocalizedintheinitialstages,canspreadtootherregionsofthestoredgrainifnotcheckedintime,easilyresultinginlarge-scalemildewcontaminationandpestinfestation.Theconsequencesofanyoverheating,evenifitislocalized,arealwaysserioussinceitispossiblethatabatchofthegrainwillhavetobemarketedatreducedpricesorcanevenbecom
