Duomo CO233/A Quick guide

Duomo (UK) Limited - Worcestershire, England
13122018.Rev3
CO233/A - Carbon Monoxide Gas Sensor
Duomo (UK) Ltd | Tel: [phone] | email: [e-mail] | web: www.duomo.co.uk
1
Installation and Instruction Manual
CO233/A Carbon Monoxide Gas Sensor
Description
The CO233/A is a Carbon Monoxide (CO) gas sensor with IP65
protection that, together with a Duomo (UK) GS and BX control
units can detect the presence of Carbon Monoxide.
The sensor is tted with an Electrochemical Cell and is managed
by a microprocessor which not only supplies an alarm signal to
the Control Unit connected to it, but also allows execution of self-
diagnosis in order to obtain the maximum detection accuracy at
any time.
This device is useful when both the maximum CO admissible
concentration threshold set to 300ppm is exceeded, and when low
CO concentrations persist in the environment for lengthy periods.
According to the principle of accumulation, could also be toxic. The
sensor has a 0-300ppm linear output conforming to the 4-20mA
standard.
Conformity
EN45544-1-3 EN 50270
8 7 6 5 4 3 2 1
Detection
Carbon Monoxide
autosetting
CO233/A
100mm 60mm 80mm6.5mmØ

Duomo (UK) Limited - Worcestershire, England
13122018.Rev3
CO233/A - Carbon Monoxide Gas Sensor
Duomo (UK) Ltd | Tel: [phone] | email: [e-mail] | web: www.duomo.co.uk
2
Technical Specication
Power supply 12 - 24VDC ± 10%
Power demand In warm-up 15 mA In Alarm 80 mA max @ 13.8V DC
Switching alarm relay 10 A 250V ~ Resistive 5A 30Vdc resistive SELV
Fault relay 5 A 250V ~ Resistive 5A 30Vdc resistive SELV
Detection Carbon Monoxide (CO)
Sensor Electrochemical cell
Sensor Element range 0-5000 ppm
Sensor output range 0-330ppm
Analog output signal 4-20 mA standard tolerance
Detector accuracy 1% FS
Long term shift in clean air < + 2ppm
Response Time < 10”
Warm-up time 1 to 5 minutes
Time work regime 4 minutes
Functioning humidity 0-90% non condensed
Functioning temperature -20°C to + 50°C
USB TestSocket TS1008
Compatible Control units BX444-Mc, GS100M, BX150, GS300M, GS300-Mc, BX316xp
Max. distance between sensor and unit 100 m
Cable diameter for connecting sensor 1 mm
Connection: The sensor connection cables should not be laid with the supply cables. If the cables are laid together with
power cables, you must use a shielded cable
Sensor Enclosure Aluminium
Size 100 x 100 x 60mm
Degree of protection IP66
INDICATIONS
Regular operation: Green
Fault: Yellow
Main Alarm (Max instant concentration 300 ppm): Red
TWA (eight hours alarm @ average of 30ppm): Cyan
STEL (15 minutes alarm @ 200 ppm): Magenta
Precautions and Maintenence
CHECK the integrity of the unit after having removed it from the box.
Check that the data written on the box correspond to the type of gas used.
When doing the electrical connections, follow the drawing closely.
Any use of the detector for purposes other than the intended one is considered improper and as a result of which Duomo
(UK) therefore disclaims any responsibility for possible damages caused to people, animals or objects.
The installation and maintenance of the CO233/A Sensor and removal at the end of the functional life must be carried out
by authorized or specialized personnel.
Do not allow the CO233/A to become wet.
The product is not waterproof either when immersed in water or exposed to high levels of humidity.

Duomo (UK) Limited - Worcestershire, England
13122018.Rev3
CO233/A - Carbon Monoxide Gas Sensor
Duomo (UK) Ltd | Tel: [phone] | email: [e-mail] | web: www.duomo.co.uk
3
Important Notes
IMPORTANT: Assembly / maintenance of the appliance must be carried out by qualied personnel and in
accordance with applicable laws and regulations.
The manufacturer assumes no responsibility for the use of products that have to comply with particular
environmental and / or installation standards.
IMPORTANT: Before connecting the equipment, it is recommended that you read the instruction manual
carefully and keep it for future reference.
8 7 6 5 4 3 2 1
8 7 6 5 4 3 2 1
NC CNO
C
NO
NC
ALARM
POWER SUPPLY
12-24VDC
LINEAR OUTPUT
4-20mA
R - +
FAULT
Electrical Connections
IMPORTANT: Before connecting to the mains power, ensure the voltage is correct. Carefully follow the
instructions and the connections according to Regulations in force, keeping in mind that the signal cables should
be laid separate from the power cables.

Duomo (UK) Limited - Worcestershire, England
13122018.Rev3
CO233/A - Carbon Monoxide Gas Sensor
Duomo (UK) Ltd | Tel: [phone] | email: [e-mail] | web: www.duomo.co.uk
4
Display Indications
Positioning of the Sensor
The position of the sensor is a crucial factor for its correct
functioning. The sensor must be placed at a height of:
160 cm from the lowest point on the oor up to 30 cm
from the ceiling, and in all cases at an average height in
the monitored area.
The sensor must not be placed near the following:
furnaces, fuel-burning kitchen appliances, replaces,
ranges, suction fans, and should not be aected by
smoke, vapour as these could distort its measurement.
The sensor must not be placed away from sources of
heat, suction fans, ventilation fans, windows, doors, etc.
that can distorting the detection, should be placed away
from heat sources and away from aspirators or fans.
Troubleshooting
If the device does not start up.
Check that the 12/24 VDC power is present, and that positive and negative polarity has not been inverted.
If the Fault LED condition occurs.
Check that the cables are connected according to the drawing, and that the wire isolation sheath has not been pinched.
Check the voltage at the terminals 1-2. It must be higher than 11 VDC and lesser than 25VDC.
Check the voltage at the terminals 2-3. It must be from a minimum of 0.8 VDC to a maximum of 1.1 VDC.
8 7 6 5 4 3 2 1
Detection
Carbon Monoxide
autosetting
CO233/A
8 7 6 5 4 3 2 1
Detection
Carbon Monoxide
autosetting CO233/A
8 7 6 5 4 3 2 1
Detection
Carbon Monoxide
autosetting
CO233/A
GREEN
When the display is Green in colour with a gas
concentration in parts per million (ppm). This indicates
that the toxic gas threshold has not been exceeded.
WHITE
When the display shows the White colour and text ‘Con’
is shown. It indicates that the testing instrument is
connected.
YELLOW
When the display shows the Yellow colour and text
‘FAU’ is shown. It indicates a sensor fault. This
immediately triggers the fault relay.
MAGENTA
When the display shows the Magenta colour and text
‘StA’ is shown. It indicates that the maximum average
concentration to which an unprotected worker may be
exposed in any fifteen-minute interval during the day
has been detected (200ppm) and the main alarm relay
has triggered.
CYAN
When the display shows the Cyan colour and text ‘8hA’
is shown. It indicates the maximum average
concentration to which an unprotected worker may be
exposed in any eight-hour interval during the day has
been detected (30ppm) and the main alarm relay has
triggered.
RED
When the display shows the Red colour and a gas
concentration in ppm is shown. It indicates the toxic
gas threshold has been reached or passed. If the 300
ppm has detected the main alarm relay is triggered
immediately.
Sta
8HA
300ppm
0ppm
CON
FAU
Important Notes
IMPORTANT: Assembly / maintenance of the appliance must be carried out by qualied personnel and in
accordance with applicable laws and regulations.
The manufacturer assumes no responsibility for the use of products that have to comply with particular
environmental and / or installation standards.
IMPORTANT: Before connecting the equipment, it is recommended that you read the instruction manual
carefully and keep it for future reference.