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MTL831B IS Analogue Multiplexer Transmitter

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.

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Essential details：MTL831B IS Analogue Multiplexer Transmitter

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

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MTL831B IS Analogue Multiplexer Transmitter

With a screwdriver, apply an anti-clockwise force against the retaining arm of one of the base clips to release it from its recess.
Hold the arm in this position and slide the clip outwards. Release the retaining arm to engage the tooth in the base moulding. Adjust the position of the other two clips with a similar procedure. Mount on any flat surface using three M4 bolts or screws (or other suitable fasteners with a shank diameter of 4mm or less) through the three clips according to the mounting centres shown in figure 3.

Remove the upper and/or lower undrilled gland plates and drill suitable holes for the entry glands required. Possible hole configurations are listed in the table.
Mount the unit on the internal T-section rail of the enclosure as
described in (1). Mount the enclosure on any flat surface using four M8 bolts (or other suitable fasteners with a shank diameter of 8mm or less) through the four fixed lugs according to the mounting centres shown in figure 4.

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