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 mustbe protected by an MTL3052 digital isolator

mounted in the safe area.