MTL4000 SERIES
Isolating IS Interface Units

For close integration of IS circuits into process-connected systems

• Compact modular design with 'plug-in' connections
• High packing density without loss of single-loop integrity
• System backplane with bussed power and safe-area connections
• Custom-designed backplanes for closest integration into process-connected systems
• Reduced system engineering and installation costs
• Range of standard enclosures protected to IP65
• Modules certified internationally for equipment and wiring in all zones and explosive atmospheres

The MTL4000 Series of 'third-generation' isolating interface units introduces new concepts for integrating intrinsic safety into large or medium sized process-connected systems. Being exceptionally compact, the units give high packing densities without sacrificing single-loop integrity. Units plug into system backplanes with safe-area connections made by multiway connectors - an approach which not only simplifies engineering but also reduces installation and maintenance costs.

Modules handle the majority of applications covering on/off or analogue signals between hazardous-area equipment and safe-area systems. Modules incorporate proven intrinsically safe isolation techniques internationally certified for protecting equipment and wiring in all zones and explosive atmospheres.

Key module design features include a multiway connector on the base of each unit which mates with a connector on the backplane to provide both safe-area and power supply connections. Hazardous-area connections are made by a single connector which plugs into the top of the module. These connectors are available with either screw-clamp terminals or crimp connectors. This use of removable connectors greatly simplifies installation and maintenance, so reducing time, cost, and the risk of errors.
Status LEDs, configuration switches and ports are located on the tops of individual modules for easy access.

The compact design (modules are only 16mm wide) reduces weight and gives exceptionally high packing densities.

Based on proven IS isolation technology, MTL4000 Series modules do not need a high integrity earth and the associated circuits can be left floating or be earthed at any one point. With the exception of switch/proximity detector inputs, all modules provide single-loop integrity to maximise system security.

Line fault detection (LFD) facilities are provided on the MTL4014/4015/4016/4017 switch/proximity detectors, the MTL4023 solenoid/alarm driver and the MTL4045B 4/20mA isolating driver.

System backplanes are located in safe areas and, since the hazardous-area circuits are connected directly to the modules, do not need to be certified.

Data Sheet