MTL831B  IS Analogue Multiplexer Transmitter

1 ABOUT THIS MANUAL
The purpose of this manual is to provide the user with information on the installation, connection and configuration of the MTL831B analogue mutliplexer transmitter.

1.1 Related documents
This manual does NOT cover the connection or configuration of the MTL838B-MBF receiver. For details of this item consult:
♦ INM838B-MBF.
Additional application information is available in:
♦ AN9010.
1.2 Product description
The MTL831B analogue transmitter can transfer a number of hazardous area input signals to the safe area down a data highway consisting of a single twisted pair cable. It is intrinsically safe and can therefore be mounted in Zone 0 hazardous areas or Class I, Division 1 hazardous locations.
The MTL831B can monitor up to 16 inputs from THC or millivolt sources or up to 15 inputs from 2, 3 or 4-wire RTDs.
Two (i.e. dual redundant) data highway outputs are provided that can carry both signal and power over distances up to 3km, depending on the application, the cable and the (noise) environment – see Section
4.4. The highway cables can be simple twisted-wire pairs or pairs of wire within an IS multi-core cable.

At the other end of the data highway, MTL838B-MBF receivers are used to translate the information transmitted from the MTL831B. The MTL838B-MBF provides a Modbus® serial data output representation of 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 isolator mounted in the safe area.

MTL831B