MTL831B IS Analogue Multiplexer Transmitter

Description

MTL831B IS Analogue Multiplexer 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.

MTL831B

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.
2 GETTING STARTED
Installation of the MTL831B multiplexer transmitter is divided into
three main topics.
♦ Mechanical Installation – how to mount the MTL831B and how it may be fitted into our enclosure.
♦ Electrical Connections – the sensor and highway
connections. If units are installed in our enclosures, it details any
special wiring arrangements.
♦ Configuration – the address and input mode selection by the setting of internal switches.
Note: A new user might find it helpful to set up the system, or a
simple version of it, in an indoor test area to gain familiarisation
before undertaking installation on site.

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