Duct BACnet Sensor Range (DBAC)

Duct BACnet Sensor Range (DBAC)

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.

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 also be controlled over the network.

This cost effective and versatile sensor is ideal for any application, including natural and demand controlled ventilation systems.


View FileDuct BACnet Sensor Range - CO2, Temp & RH (24V AC/DC)

Key Features

  • 24V AC/DC Power Supply
  • Pluggable terminal block
  • Automatic object configuration
  • 3x 0-10V outputs (Network writeable)
  • Volt free contact output (Network writeable)
  • Typical 10+ year life expectancy
  • Self-calibrating CO2 sensor
  • Flanged enclosure with hinged lid for ease of installation

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
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 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
RH Range 0 - 100%
RH Accuracy +/-2% @ 20 - 80%
Operating Conditions Temp 0°C to 50°C
Humidity 0 to 95% (NC)
Sampling Method Diffusion
Warm-up Time 30 seconds
IP Rating IP66 (external to duct)
Housing Material Flame Retardant ABS/PC
Approval CE


Height 152 mm
Width 110 mm
Depth 50 mm
Probe Length 200 mm

Installer Selectable Options

  • CO2 Analogue output (2,000 / 5,000 ppm)
  • Relay set point (see below)

The unit has two user selectable programmes to control the volt free contact set point depending on the application.

These are as follows:

Program Ventilation Gas Safety
Relay Position Normally Open Normally Closed
Relay Set Point   1,000ppm 4,500ppm

Part Numbers & Options / Accessories

Part No Description
DBAC-CO2 Duct BACnet Sensor - CO2
DBAC-CO2TH Duct BACnet Sensor - CO2, Temp & RH
DBAC-TH Duct BACnet Sensor - Temp & RH

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