SD16X-MTL SD range

MTL model sheet

• General Information

The SD range is a series of surge protection devices combine
unparalleled packing densities, application versatility, proven
reliable hybrid circuitry, simple installation and optional ‘loop
disconnect’ facilities – features which make the range the ultimate
surge protection solution for process equipment, I/O systems and
communications networks.
For three wire applications the specially designed SDRTD
(Resistance Temperature Detector) and the SD32T3, (for separately
powered 4-20mA loops) provide full 3-wire protection in a single
compact unit. The recommended choice for the protection of
3-wire pressure transducers on low power circuits is the SD07R3.
The exceptionally high packing densities are the consequence
of an ultra slim ‘footprint’ for individual modules which can thus
‘double-up’ as feedback terminals. Each module provides full
hybrid surge protection for 2 and 3 wire loop protection.
Modules with a comprehensive range of voltage ratings cover
all process related signals such as RTDs, THCs, 4 to 20mA loops,
telemetry outstations, shut-down systems and fire and gas
detectors.
Optional ‘loop disconnect’, is a feature which allows
commissioning and maintenance to be carried out without
removal of the surge protection device. This facility is provided
by the SD07, SD16, SD32 and SD55 units. In addition, a third
connection on the field and safe side of the protector is provided
in order to terminate screens safely.
Eaton Electric Limited,
Great Marlings, Butterfield, Luton
Beds, LU2 8DL, UK.
For higher bandwidth applications, the SDR range has been
developed to meet the demands of today’s highest speed
communication systems.
120V and 240V AC versions are available for I/O and power
supplies up to three Amps of load current and telephone networks
can be protected by the SDPSTN.
One simple manual operation clamps modules securely onto DIN
rail, which automatically provides the essential high-integrity
earth connection.
‘Top-hat’ (T-section) DIN rail is generally suitable for mounting SD
modules although for adverse environments, a specially-plated
version is available. A comprehensive range of mounting and
earthing accessories can also be supplied, see page 7 for further
details.

• Technical parameters of MTL SD range:

Analogue inputs (high-level)

2-wire transmitters, 4-20mA, conventional
and smart
The SPDs recommended for use with
‘conventional’ and ‘smart’ 4-20mA
transmitters (fed by a well-regulated supply)
are the SD32 and SD55, the choice depending
upon the maximum working voltage of the
system (32V and 55V respectively). The
diagram illustrates a prime example of an
application for which the fuse/disconnect
facility is particularly useful, however, both
models are available in ‘X’ versions without
the optional fuse/disconnect feature.

Analogue inputs (low-level)

These applications are best served using the
SDRTD. For optimum accuracy, the energising
current should be chosen to ensure the
voltage across the RTD does not exceed 1V
over the full measurement range. When using
a PT100 device, we recommend an energising
current of 1mA.

HONGKONG XIEYUAN TECH CO., LIMITED
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