Detection of Toxic, explosive gases & O
2
3 Stages of Alarm - 1
st
& 2
nd
level and Main Alarm
Digital
display
- Colour change feature in Alarm
Microprocessor
control
Wall
or
panel
fascia
mounted
For up to 4 Sensor
4
-
20mA
signal
input
from each sensor
Measuring
range
0
-
20%
LEL
/
0
-
300ppm
NEW - Oxygen Depletion or excess monitoring
IP44
protective
rating
CE Certified and approved to EN50194 f
or
explosive
gases
and
EN50291
for
toxic
gases
2 year Warranty - extendable to 3 years by registering
this product on-line www.duomo.co.uk
Features
The BX444-M is a wall or panel mounted microprocessor
based gas detector control unit. It can be configured to
meet customer requirements. The following parameters
can be changed using on board DIP switches:
Number
of
sensors
from
1
to
4
Type
of
gas
to
be
sensed
(explosive
or
toxic)
Display
type,
either
LEL
or
ppm
Intrinsic safety opt
ion
(on
or
off )
Main
alarm
relay
action
(latching
or
auto-reset)
Oxygen Depletion or Excess monitoring
Application
Duomo
is
recognised
within
the
gas
industry
for
providing
a
comprehensive
range
of
low
cost,
high
reliability
gas
detection
for
many
applications.
Duomo
Gas detectors are
installed
in
locations
such
as
boiler
rooms,
kitchens,
car
parks,
aircraft
hangers,
factories
and
shopping
centres.
The
BX444-M
is
the
command
centre
for
the
complete
range
of
Duomo
gas
sensors.
All
Duomo
products
are
manufactured
to
meet
relevant
European
Normatives
and
proposals
for
explosive
and
toxic
gases.
EN50194 EN50291
EN50270 EN 61010-1 and designed to be installed to
EN60079-29-2.
Operation
When
any
connected
sensor
detects
the
presence
of
the
target gas a 4 - 20mA
signal
is
sent
to
the
detector,
proportional
to
the
level
of
gas.
The
BX444-M
then
operates
a
pre-alarm
relay
-
used
for
remote
sirens
or
visual
indicators.
If
the
level
of
gas
continues
to
rise
then
the
second
pre-alarm
is
actuated.
In
the
case
of
explosive
gases,
when
the
level
of
gas
reaches
20%
LEL,
the
main
alarm
relay
is
activated
to
break
the
electrical
supply
to
the
gas
safety
shut-off
valve
(SSOV).
The
BX444-M
also
has
a
separate
volt-free
sensor
fault
relay
that
actuates
if
the
correct
return
signal
is
not
sensed
by
the
detector.
The
BX444-M
can
be
configured
to
detect
explosive
or
toxic
gases.
The backlit colour display scrolls through each
sensor and reports their individual status.
CAUTION!
Carefully read the following instructions prior to
installation of this device. Always keep this pamphlet for
future reference. Ensure that the gas detection system is
wired correctly and is only used for the purpose for
which it is intended.
BX444-M
c
Gas
Detector
i
w:
www.duomo.co.uk
-
e:
-
t:
01905 797989
-
f:
01905 774296
|
©
Duomo
(UK)
Ltd.
20
16
Installation and User Guide Rev.01.
The New BX444Mc has a
TEST timer function
for use by
service and commissioning engineers only. The
controller has a built in sensor test delay that permits the
main alarm relay - in a typical installation operates the
gas valve - to remain on during the alarm phase of a gas
test. This is a great feature in situations where shutting
down the gas supply to boiler plant and other
appliances is not desirable. For more information call the
Duomo technical department on 01905 797989.
