◆ Exceptionally high packing densities – only 7mm barrier width

◆ 24V dc supply connections simplified – optional power comb

feeds many barriers

◆ Direct connection of cable screens and 0V lines – third terminal

on both hazardous and safe sides

◆ Patent US 5838547

MTL7000 Series award-winning, intrinsic safety shunt-diode

safety barriers are innovative devices designed to provide

exceptionally high packing densities, straightforward

‘single-operation’ installation and simplified

connection, commissioning and maintenance

facilities. Many of the MTL7000 Series features

duplicate the functions of conventional field terminals

and the barriers can, therefore, ‘double up’ as

terminals for many applications, saving even more space.

A barrier width of only 7mm enables

maximum packing densities due to the use of surface

mount and thick-film hybrid circuit technologies

(subjects of patent applications).

Barrier identification is provided by one or both

of two methods. The first consists of tagging strips

mounted on posts located at each end of a row of

barriers while the other consists of separate

identifiers attached to the tops of individual barriers.

Of these, the first can be used to tag locations as well

as barriers and is recommended for large

installations while the second is better suited to

installations of a few barriers only.

An optional power comb simplifies

installations where multiple barriers are powered

from a common 24V dc source (via a power feed

module or a dummy barrier). The comb replaces

individual power supply connections to each barrier,

yet allows single barriers to be removed without

affecting the others. The power feed module powers

up to 40 barriers and incorporates a trip which

switches off the supply to the barriers if a fault (such

as an overvoltage) occurs in the power source

circuit.