Eaton DB3B Technical Manual

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Contents

10 Sounder - dB3B TM264 June 2019 www.eaton.comSounder - DB3BEnglish7.0 Special conditions for safe usea) Type DB3B Ex d:IECEx BAS 13.0112X, IECEx BAS 13.0113X,Baseefa13ATEX0229X & Baseefa13ATEX0231X1. For replacement purposes the cover fixing screwsshall be of stainless steel grade A2-70 or stronger.2. Painting and surface finishes, other than thoseapplied by the manufacturer, are not permitted.3. When the unit is used in dust atmospheres (GDunits only) the cable entries used shall be sealedto maintain the IP6X rating, in accordance with theapplicable installation codes.4. This apparatus is suitable for use only in ambienttemperatures as follows:Max. Power rating Tamb. TG Td-55°C to +85°C T4 T135°C15W -55°C to +55°C T5 T100°C-55°C to +40°C T6 T85°Cb) Type DB3B Ex de:IECEx BAS 13.0114X, IECEx BAS 13.0115X,Baseefa13ATEX0232X & Baseefa13ATEX0233X1. For replacement purposes the cover fixing screwsshall be of stainless steel grade A2-70 or stronger.2. Painting and surface finishes, other than thoseapplied by the manufacturer, are not permitted.3. Not more than one single or multiple strand wiringlead shall be connected into either side of any terminal,unless multiple conductors have been joined in asuitable manner, e.g. two conductors into a singleinsulated boot lace ferrule.4. Leads connected to the terminals shall be insulatedfor at least 275V and this insulation shall extend towithin 1mm of the metal of the terminal throat.5. Minimum creepage and clearance distances betweenthe terminals and adjacent conductive parts (includingcable entry devices) must be at least 6mm.6. All terminal screws, used and unused, shall betightened down.7. When the unit is used in dust atmospheres (GDunits only) the cable entries used shall be sealedto maintain the IP6X rating, in accordance with theapplicable installation codes.8. If used, internal optional earthing material shall beanti-corrosive.9. This apparatus is suitable for use only in ambienttemperatures as follows:Max. Power rating Tamb. TG Td-50°C to +85°C T4 T135°C15W -50°C to +55°C T5 T100°C-50°C to +40°C T6 T85°C8.0 Functional safetyIntroductionThe DB3B Sounder has been designed for use inpotentially explosive atmospheres and harsh envi-ronmental conditions. The glass reinforced polyesterenclosures are suitable for use offshore or onshore,where light weight combined with corrosion resistanceis required.The safety function of the Sounder is to provide a pre-determined audible warning sound when required if thecorrect voltage is applied to the unit. The DC version ofthe Sounder is designed to operate on a supply voltagebetween 12-48v dc.Under No fault (Normal) Operating conditions the DB3BSounder will provide an audible warning sound whenrequired by the system.Under fault conditions the failuremode of the Sounder is a failure to provide an audiblewarning sound. For the failure rate associated with thisfailure mode please refer to the table below.Assessment of functional safetyThis Sounder is intended for use in a safety systemconforming to the requirements of IEC61508.UL has conducted a Failure Modes Effect and Diagnostic.Analysis (FMEDA) of the DB3B Sounder against therequirements of IEC 61508-2 using a Proof Test Intervalof 8760hrs.The results are shown below and are based on Route 1H.The Sounder is classed as a Type B device.