MTL4850 MTL Instruments HART® Multiplexer

The MTL4850 HART multiplexer provides a simple interface between smart devices in the field, control/safety systems and HART® instrument management software running on a PC. The system is based on 32-channel modularity to provide a compact, easily configurable and expandable system. Using a standard RS485 serial link, up to 2016 individual HART devices can be connected to a single network. For the optimum solution, the modules mount directly to either a range of generic or customised connection units/backplanes. The MTL4850 is certified for the use with safety related subsystems to IEC 61508, and is the first choice of HART multiplexer for these applications. It can be connected to signal loops that are part of safety instrumented functions up to SIL3. With the fixed modularity of 32 channels, the speed of scanning field devices and responsiveness to PC software requests is optimised when compared to master/slave configurations. The MTL4854 mounts on the same range of backplane as the MTL4850 but includes four HART modems that enable simultaneous communications with connected field devices to be carried out. The primary application for this is to enable monitoring of other channels to continue while one channel is being used for valve positioner diagnostics.

Specification

Product type : HART® Multiplexer

Number of channels : 32

Channel transmitter type : HART rev 5 – 7

Channel interface : 2 connections to each channel field loop (64 total)

Host system interface : RS485 2-wire multidrop (up to 63 MTL4850 modules can be connected to one host)

RS485 baud rate : 38400, 19200, 9600, 1200 baud - (auto-detected)

Address selection : 8-bit interface, up to 64 addresses

Channel-to-channel isolation : 50V dc

Field loop isolation : 50V dc Module is coupled to loops via capacitor in each connection leg (i.e. 2 capacitors per channel)

Supply voltage : 19V to 35V dc

Currrent consumption : 60mA at 24V ±10%

Power dissipation : <1.6W at 24V ±10%

PSU protection : Reversed polarity protected Fused (375mA)

Temperature range Operating : –40°C to +70°C Non-operating: –40°C to +85°C

Relative humidity : 5% to 95% - non-condensing

Dimensions (LxWxH) : 1.8cm x 12.4cm x 10.62cm

Weight : 0.125 Kg

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