Technical / Programming Manual
FT128 Rev 2.2
63
6.1.5 Built-in Isolators
The units 4433, 4439 and 4477 have a built-in isolators that do not require any separate
COM loop addresses, only the Sequence Number, 00-63. As an option, these units can be
used without the isolator in function. If so, they have to be programmed in EBLWin as if
they were 3333, 3339 and 3377 units and via the Address setting tool 4413 set to 2330
mode instead of NORMAL mode.
6.1.6 Units for Hazardous (Ex) Areas
In hazardous (Ex) areas, Intrinsically Safe (IS) and approved products are required. The IS
alarm points are connected to an interface outside the hazardous area.
Normally the analogue addressable units, IS smoke (2840) and heat (2841) detectors are
to be used. They are connected to an IS barrier unit (2842), which is connected to a CIE
via a COM loop.
Conventional units are connected via a Galvanic isolator MTL 5061 (2820) to an Expansion
board 4580 Ex Zone Line Input See drawings F735 and F736.
6.1.6.1 Galvanic isolators / IS barrier units
MTL5061 Galvanic Isolator (2820). The isolator is used to connect conventional
intrinsically safe detectors and manual call points to an expansion board 4580 Zone
Line Input (programmed in "Resistor-Ex" mode). The isolator has two Zone Line
Inputs and two outputs (Channel 1 & 2) and is mounted in a Waterproof box
(IP66/67), which has to be mounted outside the hazardous (Ex) area. Four
compression glands for the cable entries and two End-Of-Line resistors (10K) with
an area >230 mm
2
are supplied. Box dimensions: 175L x 125W x 150H mm.
BASEEFA / ATEX classification: EEx ia IIC Tamb=60°C.
2822 Isolated Zone Interface. The Isolated Zone Interface (2822) contains a waterproof
box (IP66/67) that is supplied with four compression glands for the cable entries,
an Isolated Zone Interface board (2823) mounted on a DIN rail, a DIN rail interface
intended for an I/O unit 3361 and one 8K2 EOL resistor. The box has to be
mounted outside the hazardous (Ex) area
A Galvanic isolator 2820 is to be connected to the Isolated zone interface 2822 (i.e.
to the Isolated zone interface board 2823), which is connected to a COM loop via
an Addressable multipurpose I/O unit 3361 that can be mounted inside the
waterproof box. (2820 and 3361 have to be ordered separately.) External power
supply 24 V
DC
(30 mA) is required. Box dimensions (L x W x H): 175 x 175 x 75
mm.
2842 Intrinsically safe (IS) barrier unit. The barrier unit is used to connect analogue
addressable IS detectors to a COM loop. The unit has connectors for COM loop
in / out, external power supply (24 V
DC
, 60 mA) and one IS COM line for connection
of up to 20 IS detectors 2840 and 2841. It is mounted in a Waterproof box
(IP66/67). Five compression glands for the cable entries are supplied. Box
dimensions (L x W x H): 280 x 280 x 133 mm. DEKRA: II (1) G [Ex ia Ga] IIC.
6.1.6.2 Intrinsically Safe Mounting Bases
YBN-R / 4 IS Intrinsically Safe mounting base (2812). In the base, an intrinsically safe
conventional smoke or heat detector can be plugged. The base has terminals for
the zone line (in/out) and for an RIL.
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