Technical information

Page 67
The MTL700 series are 1 or 2 channel devices
which pass the electrical signal from fire detectors
to the control panel or from the control panel to
the output device. The barriers limit the amount of
energy to a level that cannot ignite explosive
atmospheres. The over-voltage protection
provided by a Shunt-Diode Safety Barrier is with
reference to the safety barrier earth connection. It
is therefore imperative that a HIGH INTEGRITY
EARTH is used for this type of barrier.
Product Codes
517.001.201
MTL728 Single Channel Zener Safety Barrier.
517.001.202
MTL788 Dual Channel Zener Safety Barrier.
546.004.005
Intrinsically safe sounder circuit interface module
MTL 700
The MTL3000 series interface units offer a
compact and easy-to-use means for
communicating safely with conventional fire
detectors and output devices in the hazardous
area. The MTL3000 solution provides an
alternative to the shunt-diode safety barrier where
isolation is essential or preferred or a high
integrity earth is not readily available.
The MTL 3021 enables the intrinsically safe
sounder type IS28 (576.501.013) to be activated
from the safe area. An absolute maximum of 4 off
I.S28 sounders may be connected to each
MTL3021 unit.
The MTL 3043 is used primarily with intrinsically
safe conventional type (M300 series, H600 series,
S100 series, S231i+ ) automatic fire detectors
and the CP220Ex intrinsically safe callpoints. The
MTL3043 is not suitable for use with addressable
fire detectors. For application guidance, refer to
the relevant documentation for system 601 and
system 602.
Product Codes
517.001.204
MTL3043 Galvanic Isolation safety barrier
517.001.203
MTL3021 Galvanic Isolation safety barrier
MTL 3000
Intrinsically Safe Barriers and Housings
The following section relates to a range of intrinsically safe barrier and isolator equipment for use with Tyco Safety Products manufactured fire detection
systems. It essentially encompasses the relevant MTL 5000 and MTL 7000 series barriers plus the associated housing options as an alternative to existing MTL
700 and MTL 3000 series equipment.
On all issues of intrinsically safe systems design, please refer to Manual 26A for guidance.
Datasheet - Product Code PSF24 “System 601/602 for Hazardous Areas”
Manual - Vol026A-02-D1 “Intrinsically Safe Systems 601 & 602 Manual”
Galvanic Barriers
The MTL 5061 is a two channel interface for use
with conventional fire and smoke detectors
located in hazardous areas. This galvanic isolator
is CE marked, and replaces the MTL 3043 barrier
option. It is suitable for connecting loads in Zone
0, IIC, T4-6 hazardous areas if suitably certified.
The MTL 5021 Isolating sounder driver enables an
intrinsically safe sounder device located in the
hazardous area, to be controlled from the safe
area. The MTL 5021 barrier is designed as a CE
marked replacement for the existing MTL 3021
barrier. It has one channel and is suitable for
connecting loads in Zone 0, IIC, T4-6 hazardous
area if suitably certified.
When designing new systems or upgrading
existing MTL 3000 series systems to MTL 5000
series, please use the appropriate MTL “DX”
series enclosure equipment.
Product Codes
517.001.244
MTL 5061 2 channel galvanic isolator for
conventional detector zone - used on BASEEFA
Approved System 601
517.001.245
MTL 5021 I.S. Sounder driver
MTL 5000
The MTL 7100 Series intrinsically safe shunt-
diode safety barriers are innovative devices
designed to provide exceptionally high packing
densities, straightforward installation and
simplified connection, commissioning and
maintenance facilities. The MTL 7100 Series
include secondary replaceable fuses. These are
useful where there is the possibility of faults
occurring during commissioning, which would
otherwise blow the barriers’ internal safety fuses.
One secondary replaceable fuse for each barrier
channel is provided and is lower in value than the
safety related fuse. Fuses are packaged in small
mouldings which can be latched in a disconnect
position to break the safe and hazardous areas
during commissioning, maintenance and fault
finding, thus avoiding the need for additional
disconnect terminals.
Please note that this barrier is a direct alternative
for the MTL 728+ barrier. Currently, there is no
direct alternative for the MTL 788+ barrier used
with the MINERVA addressable system. So
addressable MINERVA systems must use the
existing MTL 788+ barrier and associated
housing option.
Product Code
517.001.246
MTL 7128+ Zener safety barrier for conventional
detection circuits designed in accordance with
System 601
MTL 7100
Zener Barriers