Duomo BX444-Mc Installation And User Manual

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
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
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.
w: www.duomo.co.uk -
parks, aircraft hangers,
second pre-alarm
e: sales@duomo.co.uk
BX444-Mc Gas Detector
Detection of Toxic, explosive gases & O
3 Stages of Alarm - 1
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 for 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 option (on or off )
Main alarm relay action (latching or auto-reset)
Oxygen Depletion or Excess monitoring
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.
is
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.
- t: 01905 797989 -
Installation and User Guide Rev.01.
st & 2 nd level and Main Alarm
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CAUTION!
f: 01905 774296 | © Duomo (UK) Ltd. 2016
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