Eaton MTL831B Manual

Also see for MTL831B: Technical support

Contents

INM831B Rev 4 1MTL831BIS analogue multiplexer transmitter INM831B Rev 31 ABOUT THIS MANUALThe purpose of this manual is to provide the user with information onthe installation, connection and configuration of the MTL831Banalogue mutliplexer transmitter.1.1 Related documentsThis manual does NOT cover the connection or configuration of theMTL838B-MBF receiver. For details of this item consult: INM838B-MBF.Additional application information is available in: AN9010.1.2 Product descriptionThe MTL831B analogue transmitter can transfer a number ofhazardous area input signals to the safe area down a data highwayconsisting of a single twisted pair cable. It is intrinsically safe and cantherefore be mounted in Zone 0 hazardous areas or Class I, Division1 hazardous locations.The MTL831B can monitor up to 16 inputs from THC or millivoltsources or up to 15 inputs from 2, 3 or 4-wire RTDs.Two (i.e. dual redundant) data highway outputs are provided that cancarry both signal and power over distances up to 3km, depending onthe application, the cable and the (noise) environment - see Section4.4. The highway cables can be simple twisted-wire pairs or pairs ofwire within an IS multi-core cable.Modbus® is a registered trademark of Schneider Automation Inc.At the other end of the data highway, MTL838B-MBF receivers areused to translate the information transmitted from the MTL831B. TheMTL838B-MBF provides a Modbus® serial data output representationof the inputs together with status information.When the MTL831B transmitter is mounted in the hazardous area,each data highway must be protected by an MTL3052 digital isolatormounted in the safe area.2 GETTING STARTEDInstallation of the MTL831B multiplexer transmitter is divided intothree main topics. Mechanical Installation - how to mount the MTL831B andhow it may be fitted into our enclosure. Electrical Connections - the sensor and highwayconnections. If units are installed in our enclosures, it details anyspecial wiring arrangements. Configuration - the address and input mode selection by thesetting of internal switches.Note: A new user might find it helpful to set up the system, or asimple version of it, in an indoor test area to gain familiarisationbefore undertaking installation on site.3 MECHANICAL INSTALLATION3.1 LocationThe MTL831B can be installed in either safe or hazardous areas(including Zone 0 or Division 1) depending upon the requirements ofthe application.3.2 Mounting optionsThe unit can be mounted on T-section DIN-rail or onto a flat surface.Eaton has a range of enclosures - ENC8, ENC8-SS, ENC83 orENC83-SS - to provide suitable IP67 protection if the transmitter islocated in an exposed area.3.2.1 Mounting on T-section DIN-rail (Figure 1)Hook the side opposite the central mounting clip onto standard 35mmDIN46277 T-section rail and push downwards until the unit clicks intoplace.To remove, ease the central clip below the base of the unit outwards(with a screwdriver) and unhook the clips on the other side.MTL831B transmitter and MTL838B-MBF reciever"Cautionary Note: In common with all other electrical apparatusinstalled in hazardous areas, this apparatus must only be installed,operated and maintained by competent personnel. Such personnelshall have undergone training, which included instruction on thevarious types of protection and installation practices, the relevantrules and regulations, and on the general principles of areaclassification. Appropriate refresher training shall be given on aregular basis. [See clause 4.2 of EN 60079-17].This instruction manual supplements the requirements of nationallyaccepted codes of practice, for example, IEC/EN 60079-14 inEurope and the National Electrical Code, combined withANSI/ISA-RP 12.12 in the USA. All installations should comply withthe relevant sections of these codes.In addition, particular industries or end users may have specificrequirements relating to the safety of their installations, and theserequirements should also be met".