Bacnet Sensor Range (BAC)

Bacnet Sensor Range (BAC)

The Flamefast BACnet sensor range can be supplied with any combination of Carbon Dioxide (CO2), Temperature & Relative Humidity, and the BACnet MS/TP interface allows for the sensors to be integrated with much larger systems over a simple two wire network.

With the optional signature Flamefast traffic light display, the sensor can provide a clear, bold indication of the air quality in the monitored space.

As default the three 0-10V outputs will provide a full scale linear output for the CO2, Temp & RH levels, however these analogue outputs can be rescaled or configured to be controlled over the network, negating the requirement for separate local controllers.

There is also the option to assign each of the analogue outputs to any of the sensor values, and the on board relay can be configured to activate based on CO2, Temperature or RH levels, or all can be controlled over the network.

This cost effective and versatile sensor is ideal for any application, including natural and demand controlled ventilation as well as for integrating with our range of gas safety systems.


View FileBACnet Sensor Range - CO2, TEMP & RH (24V AC/DC)

Key Features

  • 24V AC/DC Power Supply
  • Pluggable terminal block for ease of installation
  • Optional traffic light readout
  • Automatic object configuration
  • 3x 0-10V outputs (Network writeable)
  • Selectable Temperature output (0-10V or 10K3)
  • Volt free contact output (Network writeable)
  • Typical 10+ year life expectancy
  • Self-calibrating CO2 sensor
  • Mounts onto any standard single gang junction box or conduit box

Technical Specification

Power Supply 24V AC/DC ±10%
Power Consumption 50mA Max
Bacnet MS/TP over RS485
Baud:9k6, 19k2, 38k4 or 76k8
127 Address (1/10th Load)
Full specification available on request
Analogue Outputs 3x 0-10V
Thermistor Output 10K3A1
VFC Output SPST - 100mA @ 24V Max
CO2 Range 0 - 10,000ppm
CO2 Output scaling 0 - 2,000 / 5,000 ppm
CO2 Accuracy ±40ppm +3% @NTP
CO2 Display Resolution 1ppm
CO2 Sensing Method Non Dispersive Infra-red (NDIR)
CO2 Typical Sensor Life 10+ years
Temp Range 0 - 50°C
Temp Accuracy ±0.3°C @ 25°C
Temp Display Resolution 0.1°C
RH Range 0 - 100%
RH Accuracy +/-2% @ 20 - 80%
RH Display Resolution 0.1%
Operating Conditions Temp 0°C to 50°C
Humidity 0 to 95% (NC)
Sampling Method Diffusion
Warm-up Time 30 seconds
IP Rating IP40
Housing Material Flame Retardant ABS
Colour Pure White (RAL9010)
Approval CE


Height 125 mm
Width 86 mm
Depth 36 mm

Installer Selectable Options

  • Backlight (Enable/Disable)
  • Replaces PPM reading with 'CO2' on display
  • 0-10V or Thermistor Temp output (only one used at any time)
  • CO2 Analogue output (2,000 / 5,000 ppm)
  • Traffic light and relay set points (see below)

The unit has two user selectable programmes to control the traffic light and volt free contact set points depending on the application.

These are as follows:

Program Ventilation Gas Safety
Green - Yellow 1,000ppm 1,500ppm
Yellow - Red 1,500ppm 2,800ppm
Relay Position Normally Open Normally Closed
Relay Set Point   1,000ppm 4,500ppm

Part Numbers & Options / Accessories

Part No Description
BAC-CO2T BACnet Sensor - CO2 & Temp
BAC-CO2TH BACnet Sensor - CO2, Temp & RH
BAC-TH BACnet Sensor - Temp & RH
BAC-T BACnet Sensor - Temp
BAC-CO2TL BACnet Sensor - CO2 & Temp c/w LCD
BAC-CO2THL BACnet Sensor - CO2, Temp & RH c/w LCD
BAC-THL BACnet Sensor - Temp & RH c/w LCD
BAC-TL BACnet Sensor - Temp c/w LCD

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