The Flamefast Carbon Dioxide, VOC (Volatile Organic Compounds), Temperature and Relative Humidity Monitor provides a bold visual indication using a traffic light backlit LCD, as well as having a digital readout to displays the levels/concentrations. When both CO2 and VOC levels are being measured, the unit will display the higher of the two concentrations as the VOCs are measured in CO2 equivalent for easy interpretation.

Using the built in Volt Free Contact, the unit can be easily interfaced with Ventilation and Window Control Systems, as we as Gas Safety Systems. The unit can also simply be used as a traffic light indication to raise awareness of CO2, VOC, Temp or RH levels.

The unit offers four user selectable programmes for different applications; two aimed at Ventilation and a further two aimed at Gas Safety. Custom software profiles are also available to control the audible alarm, the relay set point and the traffic light changeover levels, based on any combination of CO2, VOCs, Temp & RH (CO2/VOC as default).


Key Features

  • 100-240VAC Power Supply
  • The back plate can be pre-wired
  • Clear digital readout
  • Bold traffic light indication
  • Volt free contact output
  • Typical 10 Year life expectancy
  • Self-Calibrating CO2 & VOC Sensors
  • Audible Alarm
  • Mounts onto any standard single gang junction box or conduit box

Technical Details

Installer Selectable Options

  • Audible Alarm
  • Backlight (Enable/Disable)
  • Trac light changeover levels and Volt Free Contact activation (see below)
  • Display options:
    • On standard Model Replace PPM reading with ‘CO2’
    • On -H model Remove RH readout

The CO2M has four factory set user selectable programmes to control the Volt Free Contact and LCD Traffic Light behaviour.
These are as follows:

Programme 1 2 3 4
Green – Yellow 1,000 1,000 1,500 1,500
Yellow – Red 1,500 1,500 2,800 2,800
Relay Position N/O N/O N/C N/C
Relay Set Point 1,000 1,500 2,800 4,500

Part Numbers & Options/Accessories

Part No Description
CO2M CO2 Monitor
CO2M-H CO2, Temp & RH Monitor
CO2M-V CO2 & VOC Monitor
CO2M-VH CO2, VOC, Temp & RH Monitor



Height: 125mm | Width: 86mm | Depth: 36mm

Technical Specification

Power Supply: 100-240VAC 50/60Hz
Power Consumption: 3W Max
CO2 Range: 0 – 5,000ppm
CO2 Accuracy: ±50 ppm +3% @ NTP
CO2 Display Resolution: 1ppm
CO2 Sensing Method: Solid State NDIR
CO2 Response Time (T90): 30 Seconds
CO2 Typical Sensor Life: 10 Years
VOC Range (CO2 Equivalent): 400-2,000ppm
VOC Accuracy: ±5% @ NTP
VOC Display Resolution: 1ppm
VOC Sensor Type: Semiconductor
Temp Range: 0 – 50°C
Temp Accuracy: ±0.3°C @ 20 – 40°C
Temp Display Resolution: 0.1°C
RH Range: 0 – 100%
RH Accuracy: 2% @ 20 – 80%
RH Display Resolution: 0.1%
VFC Output Rating: SPST – 5A @ 240V Max
Operating Conditions: Temp 0°C to 50°C
Humidity: 0 to 95% (NC)
Sampling Method: Diusion
Warm-up Time: < 1 min
IP Rating: IP40
Housing Material: Flame Retardant ABS
Approval: CE

File Description File size Downloads
pdf Aranet 4 Datasheet 232 KB 165
pdf Aranet 4 Sensor Manual 1 MB 256
pdf How Aranet 4 helped to mitigate COVID-19 risks in Milan 1 MB 152