Duomo BX444-Mc Installation And User Manual
Installation and User Guide Rev.01.
BX444-Mc Gas Detector
Detection of Toxic, explosive gases & O2
3 Stages of Alarm - 1st & 2nd 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 -
NEW - Oxygen Depletion or excess monitoring
IP44 protective rating
CE Certified and approved to EN50194 for
gases and EN50291 for toxic gases
2 year Warranty - extendable to 3 years by registering
this product on-line www.duomo.co.uk
300ppm
explosive
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 targetgasa4-20mA 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.
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
of gas to be sensed (explosive or toxic)
Type
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
New BX444Mc has a TEST timer function for use by
The
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.
i
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.
w: www.duomo.co.uk - e: sales@duomo.co.uk - t: 01905 797989 - f: 01905 774296 |
© Duomo (UK) Ltd. 2016
Technical Specification
Power Supply
Secondary Battery
Battery Charger max 2.2Ah
Power consumption
Power Consumption
Relay contact range
Pre-alarm No. 1
Pre-alarm No. 2
General alarm
Sensor fault
No. of remote sensors
Input signal
Device precision
Reaction time
Control Unit
Working temperature
Start-up self diagnostic delay
Suitable for use with sensor type
Maximum distance for sensor connection
Cable diameter for sensors
Dimensions
Protective rating
Electromagnetic compatibility CE Ref. Norms
Guarantee
230V AC 50Hz +/- 10%
12V
DC +/- 10% Max 2.2Ah
Controlled
9.3W maximum @ 230V supply voltage
5W maximum @ 12VDC.
10A resistive 250VAC, 5A 30VDC Resistive
8% LEL / 120ppm CO
13% LEL / 200ppm CO
Fixed at 20% LEL / 300ppm CO
Short circuit, interruption, sensor deterioration
1- 4 - Configurable by dip switch.
4 - 20mA on 220 ohm.
1% FS
<2"
Microprocessor
-10 °C to 6
0 °C
90 seconds
All Duomo Sensors e.g. SG500, SGM595, CO100A, CO200A, SG810
100m
1mm2 CSA (Screened and earthed one end if run with power cables).
144mm x 144mm x 110mm
IP44
EN 50270
2 years from date of manufacture extendable to 3 years by registering
this product online at www.duomo.co.uk
Overall Dimensions (mm)
14444
108
Cutout Dimensions (mm)
77
1st
Alarm
2nd
Alarm
MAIN
ALARM
LEL
FAULT
140
14444
SERVICE
REQUIRED
SENSORS
OVER LOAD
BATTERY
OVER LOAD
ON
ppm
TEST
RESET
444MC
BX
Fascia mounting the BX444-Mc in a control panel
141
141
Mounting Bracket
w: www.duomo.co.uk - e: sales@duomo.co.uk - t: 01905 797989 - f: 01905 774296 |
© Duomo (UK) Ltd. 2016
BX444-Mc Fascia & PCB Layout
Key
1. Power On - Lights when supply voltage is applied. This light flashes during self-diagnostics start up.
2. Service Required - This light flashes when the the scheduled service is required. This can period be set to
either 6 months or 1 year and is determined by risk assessment.
3. Sensors Overload - When lit indicates a short circuit or overload on the sensor circuitry.
4. Battery Overload - When lit indicates incorrect batter connection or high consumption during charging phase.
5. Test - When pressed checks the sequence and function of the BX444-Mc (See also sensor test timer)
6. Reset - Press this to reset the detector after an alarm or sensor fault condition.(See also sensor test timer)
7. LCD Display - Represents the connected sensors. Each connected sensor reading scrolls automatically. Also
displays the alarm condition and status of each sensor and the BX444mC status; e.g. Test or Fault.
8. 1st Pre-Alarm - At 8% LEL concentration of gas detected. this light is lit and Pre-alarm relay 1 actuated. This relay
output de-energises as the level of detected gas exceeds 13% LEL (Natural Gas) or 200ppm (CO).
9. 2nd Pre-Alarm - At 13% LEL or 200ppm CO detected. Pre-alarm relay 2 actuated.
10. Main Alarm - 20% LEL concentration of gas detected. Main alarm relay actuated.
11. Fault - Indicates a short circuit, sensor fault, loss of signal or incorrect connection of the sensor.In case of a sensor
failure the LED will flash when the relevant sensor is scanned.
12. LEL Explosive - lights when the internal DIP switch (CO/GAS) for a sensor is moved to the GAS position . As the
sensor value is displayed the corresponding light for that sensor is lit.
13. Toxic Gas - This lights when the internal DIP switch (CO/GAS) for a sensor is moved to the CO position. As the
sensor value is displayed the corresponding light for that sensor is lit.
14. Electrical Supply and relay connection terminal plug.
15. Sensor Switches
16. Select or deselect Oxygen mode
17. Switch for setting latching or non latching in Main alarm condition
18. Continuous or a single pulse alarm relay actuation
19. Positive safety switch.
20. Emergency Stop connection terminal. (remove link when E.Stop is fitted).
21. Sensor and battery (if fitted) connection terminal.
- These are used to turn the sensor on/off, determine the type of gas to be sensed,
w: www.duomo.co.uk - e: sales@duomo.co.uk - t: 01905 797989 - f: 01905 774296
© Duomo (UK) Ltd. 2016
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