Duomo CellAir User Manual

CellAirTM CO2 Detector

NDIR (Non-Dispersive Infrared) sensor
Measures up to 50,000ppm
Can handle up to 3 remote display units;
1 up to 25m away, 3 up to 8m apart
Large LCD display indicates ambient
CO2 concentration and temperature
Relay output to automatically control
a fan to ventilate confined spaces
Audible and visual alarm indications
IP54 water proof protection

Application

Thankyou for selecting the Duomo CellAirTM CO2
monitor. It is designed to detect the presence of
carbon dioxide in the ambient air to protect people
in confined spaces. High concentrations of CO
confined spaces are dangerous, and may lead to
health problems ranging from headaches and
fatigue to asphyxiation and death. CellAir
audible alarm and visual indication which will
activate when CO
level. Detection of high levels of CO
activate a relay that could be used for a fan to
ventilate the confined space and reduce CO
concentration in the area. CellAir
used in CO
cellars, beverage dispensing areas and fast food
outlets.

2

concentration reaches a pre-set

2

TM

can be widely

storage areas, breweries, wineries,

TM

will also

2

in

2

has an

Package Contents

SEU (Sensor Unit), RDU (Remote Display Unit), panel
holders, network cable connector, communication
cable (8m length), fixtures and fittings, user manual.

Specifications

CO2 Specification

Measurement range - 0 - 50,000ppm
Accuracy - ±100ppm or ±5% of reading

Temperature Specification

Measurement range - 0oC - 50oC (32oF - 122oF)

Alarm Levels

Alarm 1 - 0.5 / 1 / 1.5 / 2%
Alarm 2 - 1.5 / 2 / 2.5 / 3 / 3.5 / 4%

Operating Conditions

Operating temperature - 0oC - 40oC (32oF - 104oF)
Humidity range - 0 ~ 95%RH

2

Storage Conditions

Storage temperature - -20oC - 60oC (-4oF - 140oF)

Power Supply & Relay Output

AC adapter - 110/220 VAC
AC input - 100 ~ 240 VAC, 50/60Hz
AC output - 6 VDC, 1.8 W
Relay output - 30 VDC or 250 VAC, max. 2A, SPST, NO

Accuracy

Annual drift < 20ppm / year @ 400ppm

Calibration

User calibration via onboard menu system
Recommended calibration interval - 2 years

w: www.duomo.co.uk - e: [e-mail] - t: 01905 797989 - f: 01905 774296 | © Duomo (UK) Ltd. 2016

SEU (Sensor Unit) Function Instruction

The SEU should be placed in a room where the CO2 is likely to accumulate such as a room where CO2 is stored,
like an area with CO

The SEU has several functions. These are;

"DIAG" - Performs a communication test between the SEU and RDU.

"CALI" - Calibrates the unit to the ambient air.

"ReFactSet" - Restores the unit to its factory default settings.

"AL1"- Sets the 1st alarm level to 0.5, 1, 1.5 or 2% CO2 concentration (default is 1.5%).

"AL2" - Sets the 2nd alarm level to 1.5, 2, 2.5, 3, 3.5 or 4% CO2 concentration (default is 3%).

When CO2 concentration exceeds the first alarm level, the red AL1 LED will blink and the alarm will sound
intermittently. At this stage, the relay will be actuated. When levels drop back below the alarm level, the LED will
stop blinking and the alarm will stop sounding.

beverages. The large LCD displays the ambient CO2 concentration and the temperature.

2

When concentrations exceed the second alarm level, both AL1 and AL2 LED's will flash and the alarm will sound
more quickly. The alarm will remain in this state until the button has been pressed.

In the case of very high concentrations, 'ESC' will appear on the screen of the unit. It is imperative that the area be
completely ventilated and that no one enters the area until concentrations have dropped. To reset the unit, use
the "ReFactSet" function.

RDU (Remote Display Unit) Function Instruction

The RDU (Remote Display Unit) should be placed outside the room which is being monitored. This unit is
connected to the SEU by the communication cable provided. It should be placed where it can be conveniently
seen before entering the room where the SEU is located. The RDU is a repeater and displays the measurements
made by the SEU on an LCD. The RDU can be placed a maximum of 24 metres (78.7 feet) away from the SEU.

The RDU also has the "DIAG" function to test the comms between the SEU and the RDU.

Safety Notes

Warning: To ensure this product is used correctly and safely, please read these warnings and the entire user
manual before use.

Please handle the device carefully; do not subject the product to impact or shock.

1.
Do not place the unit, or the adaptor, near a heat source.

2.
Do not touch the exposed electronic circuitry of the device under any circumstances.

3.
Please only use the included power adaptor.

4.
Make sure that the power adaptor is mounted using the plug lock so that it cannot be removed without the

5.
use of tools.
DO NOT enter the room when "ESC" is displayed on the LCD of the SEU or RDU. Some action must be taken

6.
before entering the room where the SEU is installed.

Maintenance

We recommend that users test the communication between the SEU and RDU using the "DIAG" function
periodically. If the four LED's flash and the alarm sounds on both units then the system is functioning normally.

w: www.duomo.co.uk - e: [e-mail] - t: 01905 797989 - f: 01905 774296 | © Duomo (UK) Ltd. 2016