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MTL HART Interfacing

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If you have smart field devices installed and you are not making full use of their capabilities, then you need MTL's HART® connection system. Our MTL HART® products provide the connections between the HART® field instruments, the control systems and the process automation maintenance software. MTL’s HART® multiplexer system provides on-line access from a PC to the HART® field devices for monitoring device performance. HART® devices may be selected for regular status monitoring and alerts to be issued if the status changes.

Our HART® CONNECTIONS strip the HART® digital signal from the 4-20mA signal (which passes to the control system unscathed) and sends it directly to your maintenance PC. Thus giving you access to the benefits offered by the latest powerful configuration and predictive maintenance software.

  • For process control systems using traditional I/O installations, the NEW MTL4851 and MTL4852 HART® Connection System is the ideal HART® solution for new installations or upgrades, either intrinsically safe or general purpose applications.
  • For connection to signals of safety shutdown systems the MTL4850 is the ideal multiplexer with full third party verification of its suitability.
  • When you need simultaineous access to several field devices, such as when testing valve positioners, then the NEW MTL4854 is the multiplexer to use.

When it comes to HART Multiplexers, we offer the most cost effective, reliable and flexible solutions for every application and industry. From Siberian oil fields to Mexican power plants, MTL HART Multiplexers provide the optimum solution.


MTL4851 & MTL4852 HART multiplexers

The MTL4851/52 HART connection system is the system of choice for unrivalled flexibility. Based on 16 channel modularity the system can be easiliy expanded to cover up to 7936 HART devices on one network. The flexibility of the MTL4851/52 and its ability to communicate with any of the Instrument Management Software (IMS) packages on the market today allows us to offer the optimum solution for any application - both general purpose and Intrinsically Safe.

The HART multiplexer provides the brains of the system and consists of a combination of two modules, the MTL4851 - HART communications module and MTL4852 - HART interface module. They provide the HART data interface between smart devices in the field and HART instrument management software running on a PC. The modules, which mount on to a range of HART backplanes, connect to the field devices via either HART connection units or IS backplanes depending on the application.

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MTL4854 Multi-modem multiplexer

For applications where communication paths with several field devices need to be established and maintained in parallel, the MTL4854 HART® multiplexer is the ideal product to use. This is a module that has the same 32 channel capacity as the MTL4850 for connection to field devices but now has four HART modems rather than just one.

Essentially this gives 4 x 8 channel multiplexers in one compact housing, enabling simultaneous communication with several field devices through one serial link. One particular use for this is during partial-stroke testing of valve positioners, where the ability to maintain access to other connected devices while the multiplexer would otherwise be locked enables plant monitoring to continue.

The MTL4854 HART multiplexer offers the following benefits:

Connection to multiple HART devices simultaneously
Faster initialisation and loop scanning
Channel to channel isolation
Plug-and-play for serial link communication parameters
LED indication for fault diagnosis
Supports HART rev 5 - 7 devices
Onboard event log
ATEX and IECEx certification (FM, FMc to be advised)

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Ovation™ Machinery Health™ Monitor

The MTL4850 HART Multiplexer offers a smaller footprint solution ideally suited to both retrofit and new project applications. Termination boards, carriers and integrated backplanes are available to enable the MTL4850 to interface to various instrumentation applications.

The MTL4850 Hart Multiplexer is now SIL3 rated for connection to instrument loops performing safety functions up to and including Safety Integrity Level SIL3. The international standard IEC 61508:2010 provides guidelines to achieving an adequate Safety Integrity Level (SIL) for systems, sub-systems and components. Functional Safety management requirements are found in IEC61508 which states that suppliers and subcontractors shall demonstrate functional safety management.

We conform to the requirements of the international standard IEC 61508:2010 for functional safety by being certified as a Functional Safety Management company.

For more information about MTL Functional Safety Management <click here>.

The MTL4850 Multiplexer offers the following benefits:

  • Channel to channel isolation
  • Isolated power supply
  • Auto baud-rate detection
  • LED indication for fault diagnosis
  • Supports HART Rev. 5-7 devices
  • SIL3 certified for connection to safety loop
  • Onboard event log
  • ATEX, FM and CSA certification.
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