Connected buildings
Building management systems — air quality as a first-class input
A BMS controls HVAC, lighting and energy; when environmental sensors feed it well, the same system can manage indoor air quality actively. When sensors feed it badly, it can confidently make the wrong call.
Architecture
What BMS integration looks like
Sensor data points
CO₂, PM2.5, TVOC, temperature and humidity exposed as BMS objects.
Alarm handling
Threshold and rate-of-change alarms routed through BMS notification workflows.
Demand-controlled ventilation
CO₂ setpoints drive damper position and supply temperature modulation.
Dashboards
Tenant or estates-team views built on validated BMS trend data.
Protocols
How sensors actually talk to a BMS
Most commercial-grade IAQ sensors support one or more standard building protocols — BACnet/IP, Modbus TCP/RTU, KNX or OPC UA. Whether they speak the dialect of a specific BMS in practice depends on object naming, polling intervals and the configuration of the BMS controller.
Where native integration is not available, a small gateway can translate between sensor protocols and the BMS — pragmatic but adding a point of failure. Cleaner is choosing sensors whose native protocol matches the existing BMS from the outset.
We don't claim compatibility with every BMS or protocol — the field is too varied for blanket assurances. We do confirm integration as a specific project step before procurement, on the actual system in question.
HVAC optimisation
Where BMS-driven IAQ pays back
Energy reduction
Demand-controlled ventilation cuts unnecessary fresh air during low occupancy.
Comfort
Combined IAQ and thermal control reduces complaints in mixed-use spaces.
Equipment lifetime
Sensor-driven modulation reduces compressor and fan duty cycles in some patterns.
ESG reporting
Validated environmental data feeds operational sustainability reporting.
Tenancy evidence
Continuous data supports landlord-tenant discussions about IAQ provision.
Capital planning
Long-term trends inform refurbishment, retrofit and replacement decisions.
Limits
What badly-fed BMS data does
| Issue | Consequence | Mitigation |
|---|---|---|
| Uncalibrated CO₂ sensor | Demand-controlled ventilation operates at the wrong setpoint | Specify auto-calibration and a documented calibration cycle |
| Poor sensor placement | Local readings dominate; whole-zone response misjudged | Breathing-zone height, away from supply diffusers and direct sunlight |
| Single-zone control | Mixed-use spaces under-ventilated where occupancy concentrates | Zone-level sensors rather than one per AHU |
| No commissioning record | Drift goes undetected until a complaint surfaces | Document baseline, calibration log and threshold history |
Commissioning
Getting BMS-IAQ integration right
Specify before procurement
Confirm protocol, point naming and BMS controller capability before sensors are bought.
Validate at commissioning
Co-locate a reference instrument during commissioning to confirm field accuracy.
Document the calibration cycle
Capture intervals, methods and responsibilities for ongoing operations.
FAQ
BMS and air quality questions
Discuss an Air Quality Monitoring Project
BMS-integrated IAQ monitoring, sensor specification and commissioning for UK commercial buildings.
Speak to a consultantFurther reading
Systems
Sensors