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Indoor Air Quality / Environmental Sensor

Combined IAQ Sensor

A combined IAQ sensor monitors multiple indoor air quality parameters in a single unit. It commonly includes CO₂, VOC, particulate matter, temperature, and humidity, and may also include formaldehyde, CO, or NO₂ depending on the design. This makes it ideal for smart buildings, HVAC systems, offices, hospitals, classrooms, clean rooms, and industrial indoor spaces.

Explore Page Related Sensors
Monitors multiple air-quality parameters in one device
Useful in HVAC, smart buildings, and indoor workplaces
Supports ventilation, filtration, and comfort control
Ideal for IoT dashboards and environmental analytics

What is Combined IAQ Monitoring?

Combined indoor air quality monitoring means observing several indicators together to understand the health of the indoor environment. A single sensor may not reveal the whole picture, so IAQ systems combine multiple sensing elements to give a fuller view of air quality.

Industrial Meaning

Indoor air quality matters in buildings, offices, labs, hospitals, clean rooms, classrooms, and industrial indoor spaces. Poor air quality may indicate stale air, too many people in a space, solvent vapors, particulate contamination, or inadequate HVAC performance.

Why it Matters

Good IAQ improves comfort, productivity, health, compliance, and building performance. It also helps identify problems early, such as poor ventilation, filter issues, or emissions from materials and processes.

1

Air enters sensor

Indoor air is continuously sampled.

2

Multiple values read

Gas, particle, temperature, and humidity data are captured.

3

Data is processed

Controller calculates meaningful IAQ indicators.

4

Alerts / action

Ventilation or alarms can be triggered.

Working Principle

Combined IAQ sensors usually contain multiple sub-sensors in one housing. The unit may include non-dispersive infrared sensing for CO₂, semiconductor sensing for VOCs, optical sensing for particles, and temperature/humidity sensing for comfort and correction.

Typical Measurement Elements

  • CO₂ sensing
  • VOC sensing
  • PM2.5 / PM10 sensing
  • Temperature sensing
  • Humidity sensing
  • Optional formaldehyde or CO sensing

Where the Signal Goes

  • HVAC controller
  • Building management system
  • SCADA / BMS dashboard
  • IoT gateway and cloud monitoring platform

Industrial Applications

Combined IAQ monitoring is widely used in building automation and in spaces where human comfort, ventilation, and air safety are important.

Smart Buildings Supports ventilation optimization and energy efficiency.
HVAC Systems Improves fresh air control and filter management.
Offices / Workspaces Monitors comfort, CO₂, and VOC buildup.
Hospitals / Clinics Useful for maintaining clean and controlled air.
Schools / Classrooms Tracks air freshness and occupancy impact.
Clean Rooms Supports controlled indoor environmental conditions.

Typical Technical Specifications

Exact specifications depend on the combination of sensing elements included in the device.

Parameter Typical Range Notes
Measured Parameters CO₂, VOC, PM, Temp, RH Some models may include CO or HCHO
CO₂ Range 0 to 5000 ppm Common IAQ range
VOC Range Application dependent Often reported as index / TVOC
PM Range 0 to 1000 µg/m³ or higher Depends on sensor design
Temperature Range -10°C to +60°C typical Comfort and compensation use
Humidity Range 0 to 100% RH typical Comfort and IAQ use
Outputs RS485, 4–20mA, 0–10V, Relay Depends on unit and integration method
Communication Modbus RTU / TCP, UART, Ethernet Popular for BMS and IoT

IoT Integration

Combined IAQ sensors become much more useful when connected to dashboards, trends, alarms, and automation logic.

Gateway Integration

The sensor can communicate using RS485, Modbus, analog output, or Ethernet and send live IAQ data to a local or cloud gateway.

Dashboard Logic

Dashboards may show CO₂, VOC, PM2.5, PM10, temperature, humidity, IAQ index, ventilation status, and historical trends.

Common Alarm Conditions

  • CO₂ above ventilation threshold
  • VOC level rising above safe range
  • PM2.5 / PM10 spikes due to dust or pollution
  • Temperature / humidity outside comfort range
  • Sensor fault or communication failure

Frequently Asked Questions

Common questions about combined indoor air quality monitoring.

Why use a combined IAQ sensor instead of separate sensors?

A combined sensor simplifies installation, reduces wiring, and gives a broader view of indoor air quality from one device.

Can combined IAQ sensors be used in HVAC systems?

Yes. They are widely used in HVAC, smart buildings, and building management systems for ventilation control and comfort monitoring.

Can IAQ values be monitored remotely?

Yes. IAQ data can be sent to an IoT gateway and displayed on remote dashboards with alarms and historical trends.

Hexitronics Industrial IoT Integration

Combined IAQ monitoring is a strong part of smart building and industrial environmental architecture. When connected with cloud alerts and control logic, it becomes a powerful tool for comfort, safety, and energy optimization.

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