ISO 4112 2025.docx

InternationalStandardISO4112Thirdedition2025-06CerealsandpulsesGuidanceonmeasurementofthetemperatureofgrainstoredinbulkCerealesetIegumineusesDirectivesgeneratespourIemesuragedelatemperaturedesgrainsentreposesenvracdanslesinstallationsdestockageReferencenumberISO4112:2025(en)COPYRIGHTPROTECTEDDOCUMENT©ISO2025Allrightsreserved.Unlessotherwisespecified,orrequiredinthecontextofitsimplementation,nopartofthispublicationmaybereproducedorutilizedotherwiseinanyformorbyanymeans,electronicormechanical,includingphotocopying,orpostingontheinternetoranintranet,withoutpriorwrittenpermission.PermissioncanberequestedfromeitherISOattheaddressbeloworISO,smemberbodyinthecountryoftherequester.ISOcopyrightofficeCP401Ch.deBlandonnet8CH-1214Vernier,GenevaPhone:+41227490111Email:copyrightiso.orgWebsite:www.iso.orgPublishedinSwitzerlandPageContentsForewordIntroduction.2 Normativereferences13 Termsanddefinitions14 Principle15 Apparatusandsystem26 Procedure36.1 Positioningthemeasuringpoints36.1.1 Graintemperaturesensors36.1.2 Warehousetemperaturesensors36.1.3 Airtemperaturesensors36.2 Temperaturereadings46.2.1 Frequencyofreadings46.2.2 Particularrequirementsforventilatedwarehouses47 Temperaturerecords47.1 General47.2 Calibration4Annex A (informative)Temperature-readingdevices5Annex B (informative)Layoutoftemperaturemeasuringpoints6ForewordISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(ISOmemberbodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISOtechnicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhastherighttoberepresentedonthatcommittee.Internationalorganizations,governmentalandnon-governmental,inliaisonwithISO,alsotakepartinthework.ISOcollaboratescloselywiththeInternationalElectrotechnicalCommission(IEC)onallmattersofelectrotechnicalstandardization.TheproceduresusedtodevelopthisdocumentandthoseintendedforitsfurthermaintenancearedescribedintheISO/IECDirectives,Part1.Inparticular,thedifferentapprovalcriterianeededforthedifferenttypesofISOdocumentshouldbenoted.ThisdocumentwasdraftedinaccordancewiththeeditorialrulesoftheISO/IECDirectives,Part2(seeWWW.iso.org/directives).ISOdrawsattentiontothepossibilitythattheimplementationofthisdocumentmayinvolvetheuseof（八）patent(三).ISOtakesnopositionconcerningtheevidence,validityorapplicabilityofanyclaimedpatentrightsinrespectthereof.Asofthedateofpublicationofthisdocument,ISOhadnotreceivednoticeof（八）patent(三)whichmayberequiredtoimplementthisdocument.However,implementersarecautionedthatthismaynotrepresentthelatestinformation,whichmaybeobtainedfromthepatentdatabaseavailableatWWW.iso.org/patents.ISOshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.Anytradenameusedinthisdocumentisinformationgivenfortheconvenienceofusersanddoesnotconstituteanendorsement.Foranexplanationofthevoluntarynatureofstandards,themeaningofISOspecifictermsandexpressionsrelatedtoconformityassessment,aswellasinformationaboutISO'sadherencetotheWorldTradeOrganization(WTo)principlesintheTechnicalBarrierstoTrade(TBT),seewww.iso.org/iso/foreword.htmLThisdocumentwaspreparedbyTechnicalCommitteeISO/TC34,Foodproducts,SubcommitteeSC4,Cerealsandpulses.Thisthirdeditioncancelsandreplacesthesecondedition(ISO4112:1990),whichhasbeentechnicallyrevised.Themainchangesareasfollows: theterm"warehouse"anditsdefinitionhavebeenadded; theapparatusfortemperaturemeasurementhavebeenmodified; thetemperaturesensorsandthermometricsystemforstoredgrainhavebeenadded; thelayoutOftemperaturemeasurementpointshasbeenmodified; thewirelesscommunicationtechnologyandnetworkingtechnologyhavebeenadded;Anyfeedbackorquestionsonthisdocumentshouldbedirectedtotheuser'snationalstandardsbody.Acompletelistingofthesebodiescanbefoundatwww.iso.org/members.html.IntroductionGrainstorageplaysacrucialroleinensuringfoodsecurity.Thephysiologicalprocesseswhichoccurwithinamassofstoredgrainareaccompaniedbytheemissionofheat,andtheexternalenvironmentalfactors(e.g.hotclimate,ventilation)canalsocausegraintemperaturechangesinbulkstorage.Asaresult,thetemperatureofthegraincanreachalevelatwhichseriouspermanentdeteriorationinthecommercial,technologicalandfoodpropertiesofthegrainwilltakeplace.Itisthereforenecessarytodetectandmeasureanyoverheatingduringstorageandtotakeimmediateremedialmeasures,suchasventilationandcooling,sincelateremedialmeasureswill,inmostcases,havenoeffect.Inbulkstorage,suchdamageisoftenintheinitialstages,localizedandaffectsonlyasmallproportionofthegrainstored.However,suchdamage,althoughlocalizedintheinitialstages,canspreadtootherregionsofthestoredgrainifnotcheckedintime,easilyresultinginlarge-scalemildewcontaminationandpestinfestation.Theconsequencesofanyoverheating,evenifitislocalized,arealwaysserioussinceitispossiblethatabatchofthegrainwillhavetobemarketedatreducedpricesorcanevenbecom