BX444-M
c
Operation
Before
powering
up
the
BX444-M
c
once
again
check
that
all
electrical
connections
are
correct.
1. Apply 230V supply to the Ph and N terminals. Ensure that the correct fuse is used in the supply. (3 or 5A max.)
2. All of the lights on the fascia will light up in turn. This will take approximately 20 seconds. This checks the function of all
the LED's.
3. The ON LED will remain flashing for about 2 minutes. This is the sensor warm-up period. The gas detector will not
provide gas detection during this period. When the ON light becomes constant the detector is in operation.
4. By pushing and maintaining pressure on the manual TEST button a function test can be performed for all pre-alarm
relays and main alarm relay, together with LED's and audible alarm.
The sequence will be:
a) The 8% LEL / 120
ppm
and Pre-Alarm no. 1 LED will be actuated. The Pre-Alarm relay no.1 will be changed over and
terminals 6 and 7 will be connected.
b) The 13% LEL / 200
ppm
and Pre-Alarm no. 2 LED will be actuated. The Pre-Alarm relay no. 2 will be changed over and
terminals 8 and 9 will be connected and the audible alarm will continue to sound.
c) The 20% LEL / 300
ppm
and Main Alarm LED will be actuated. The Main Alarm relay will be changed over and terminals
10 and 11 will be connected, connection between terminals 10 and 12 will be broken and the audible alarm will continue
to sound. (When 'Intrinsic Safety' is on, terminals 10 and 11 will be broken and 10 and 12 will be connected). The relevant
Alarm LED's will light to show which zones are in alarm.
By releasing the the manual TEST button the lights will go out and the audible alarm will cease. If a latched alarm
function on the main relay is configured this will remain on until the RESET button is pressed.
5. In order to conduct a full function test it is essential to use Duomo or equivalent calibrated test gas. The maximum
concentrations are;
- 40% LEL for methane in air
- 350
ppm
for carbon monoxide
- 0.85% (MOL) for propane
Any
higher
than
this
can
reduce
sensor
life.
NOTE:
NEVER
TEST
USING
NEAT
GAS. THIS
WILL
POISON
THE
SENSOR.
6.
To
simulate
a
sensor
fault
situation
disconnect
the
sensor
plug.
The
detector
will
go
into
a
FAULT
alarm
and
the
sensor
fault
relay
will
be
actuated.
This
will
close
the
contacts
between
terminals
4
and
5
and
open
the
contacts
between
terminals
10
and
12
(Main
Alarm
relay). When
the
plug
is
reconnected
the
detector
can
be
reset.
w:
www.duomo.co.uk
-
e:
-
t:
01905 797989
-
f:
01905 774296
|
©
Duomo
(UK)
Ltd.
20
16
Switch
3
on
2nd DIP switch set
Determines
whether
the
audible
alarm
remains
operational
after
levels
have
dropped.
In
memory
mode,
the
alarm
remains
and
will
need
to
be
manually
reset.
In
non-memory
mode,
the
alarm
will
automatically
reset
after
levels
have
dropped.
Example
shows
memory
on
Switch 4 on 2nd DIP switch set
With switch 4 in the on position the BX444Mc is configured to indicate
oxygen levels. The function is determined by setting either excess oxygen
or oxygen depletion on the sensor itself (Duomo SGF104).
IMPORTANT NOTE.
If Oxygen setting is selected it is not possible to connect any other types of
sensors for any other gases. For example natural Gas or CO
