MTL4700 SERIES
Shunt-diode safety barriers
For close integration of IS
circuits into hazardous-area measurement and
control circuits
- Ultra-high packing density provided
by compact multichannel modules
- Reduced system engineering/installation
costs thanks to 'plug-in' connections
- High-integrity earth connections
- Customised backplanes need no
certification from most certifying authorities
- BASEEFA, FM, CSA and VNIIVE
approved
The MTL4700 Series
of 'third-generation' safety barriers are multi-channel devices
designed for close integration of intrinsic safety into process
systems. Combining the compact 'plug-in' design concept of the MTL4000
Series of isolators with the circuit designs of the well-known MTL700
Series of barriers, the new barriers provide exceptionally high
packing densities allied to proven reliability - so reducing space
requirements and weight loading without sacrificing performance.
MTL4700 Series barrier modules plug into system backplanes to make
safe-area connections while hazardous-oreo connections are made
by separate connectors plugged into the tops of modules - an approach
that both simplifies system design and reduces installation and
maintenance costs.
The range includes five 'key' models
which cover between them the majority of all process control requirements
- so simplifying barrier selection for most purposes while still
providing additional choices for applications not covered by the
'key' barriers.
Module features include a multiway
connector on the base of each unit which mates with a connector
on the backplane to bring out safe-area circuits, to provide system
earthing and (on some backplanes) to feed bussed power to particular
modules. The all-important high-integrity earth connections are
made automatically by three pins in parallel on the base connection.
Hazardous-area connections are made by a single connector which
plugs into the top of the module - simplifying installation and
maintenance to reduce time, cost and the risk of errors. These are
available with either screw-clamp or crimp terminals. Modules are
exceptionally compact (only 16mm in width) and multi-channel - giving
the high packing density and low 'weight/ channel' ratio.
Standard backplanes are available
in 8-, 16 and 24-way configurations with alternative choices of
multiway or screw-clamp safe-area circuit connections and alternative
means of providing power to the modules (by 'bussed-power' or 'general-purpose'
backplanes). The accessories include a range of enclosures to accommodate
8- and 16-way backplanes. To maintain maximum system flexibility,
modules suited to bussed power can generally also be used on general-purpose
backplanes and vice versa.
Custom backplanes
Apart from the standard range, customised backplanes to suit particular
system architectures are easy to design, either by MTL or by users,
as the backplanes carry no hazardous-area circuits, so avoiding
some design constraints and avoiding the need for expensive and
time-consuming certification procedures.
References. The following documents
ore available for further information on MTL4700 Series barriers:
AN9014 A user's guide to MTL4700 Series safety barriers
INM4700 MTL4700 Series shunt-diode safety barriers instruction manual.
Data Sheet
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