Project Overview
A modern community shopping mall and residential complex in Bangkok, Thailand, introduced a professional air quality monitoring solution to improve indoor air quality (IAQ), enhance occupant comfort, and support healthier living and commercial environments.
Across the project, 23 Tongdy TG9 in-duct multi-gas monitoring transmitters were deployed within the HVAC duct system. The solution enables 24/7 real-time air quality monitoring across both commercial and residential areas, helping ensure safer, healthier, and more comfortable indoor spaces.
Project Objectives
The project aimed to:
- Continuously improve indoor air quality and control harmful gas concentrations
- Integrate with the ventilation system for intelligent demand-based control
- Optimize ventilation energy consumption and reduce building operating costs
- Create a healthier and safer environment for shopping, leisure, and residential living
- Support green building, smart building, and sustainable development standards
Application Areas
The solution was applied in key high-traffic and high-demand areas, including:
- Community shopping mall spaces
- High-end residential apartments
- Dining areas and public leisure zones
These areas require high ventilation performance, reliable gas monitoring accuracy, and stable system operation due to dense occupancy and complex indoor air conditions.
Solution
The project adopted 23 Tongdy TG9-GAS in-duct multi-gas monitoring transmitters, installed in the HVAC supply and return air ducts to provide continuous and accurate monitoring of indoor air quality.
Key Functions
The TG9-GAS solution provides:
- Accurate monitoring of multiple gases, including CO, O2, or NO2, with optional formaldehyde monitoring
- Real-time data output for seamless integration with BMS/BA building automation systems
- High-precision electrochemical sensors with built-in temperature compensation for stable performance
- Dedicated in-duct installation design for central HVAC duct applications
- Built-in sampling fan, improving response speed by up to 50%
- Support for Demand-Controlled Ventilation (DCV) strategies
Why TG9 Was Selected
1. Integrated Multi-Gas Monitoring
A single device can monitor harmful gases such as CO and O3/NO2, simplifying system configuration while reducing installation and maintenance costs.
2. HVAC-Specific Design
TG9 is designed specifically for duct installation, allowing direct monitoring of real air quality inside HVAC air ducts. It supports both duct probe installation and split-type installation.
3. Energy-Saving Smart Ventilation Control
Real-time air quality data can drive ventilation system operation, avoiding unnecessary ventilation while balancing air quality and energy efficiency.
4. Strong System Compatibility
The device comes with an RS485 interface and supports Modbus RTU and BACnet MS/TP protocols, allowing easy integration with building automation systems. Optional analog outputs are also available for connection to PLC, DDC, or other control systems.
5. Industrial-Grade Stability and Durability
The probe includes a waterproof and breathable membrane, making it suitable for high-humidity environments. Its long-life sensors are well-suited to Bangkok’s tropical climate.
Project Results and Benefits
Improved Indoor Air Quality
The system enables accurate control of harmful gases such as CO, O3, and NO2, improving comfort and safety across both commercial and residential spaces.
Optimized Energy Efficiency
Ventilation can be adjusted based on actual air quality demand, reducing unnecessary energy consumption while maintaining a healthy indoor environment.
Intelligent Management Across All Areas
Real-time data collection, remote monitoring, and historical data analysis provide property managers with scientific support for operation, maintenance, and pollution source diagnosis.
Enhanced Building Value
The solution improves the overall quality and competitiveness of the property while supporting green building certifications such as LEED and WELL.
System Integration
Tongdy TG9 devices are connected to the Building Management System through standard industrial interfaces, enabling:
- Real-time gas concentration data collection and upload
- Automatic ventilation volume adjustment
- Alarm triggering and threshold-based control when gas levels exceed limits
- Remote monitoring, pollution source diagnosis, and maintenance management
Product details:
In-Duct Multi-Gas Sensing and Transmitter
Industry Value
This project demonstrates the essential role of air quality monitoring in commercial real estate, smart buildings, green buildings, and healthy residential developments. It shows how intelligent IAQ monitoring has become a standard configuration for modern mixed-use complexes.
FAQs
1. What gases can TG9 detect?
The TG9 series supports CO2 monitoring with a long-life NDIR sensor.
The TG9-GAS model supports monitoring of CO and either O3 or NO2, using high-precision electrochemical sensors.
2. Is TG9 suitable for residential or commercial projects?
TG9 is not suitable for individual residential ventilation systems. It is ideal for centralized HVAC systems in commercial complexes, mixed-use buildings, and large-scale facilities.
3. Can TG9 be integrated with a Building Management System?
Yes. TG9 supports RS485 and analog output. It is compatible with mainstream protocols such as Modbus RTU and BACnet MS/TP, making BMS integration straightforward.
4. Is installation complicated?
No. TG9 is designed for HVAC duct applications. It supports probe insertion into the duct or split probe installation, making construction and installation simple.
5. Does TG9 support energy-saving control?
Yes. TG9 can output analog or digital signals to support Demand-Controlled Ventilation, helping buildings achieve more efficient ventilation and energy savings.
6. Which regions is this solution suitable for?
The solution is suitable for global applications. It supports wide-range temperature and humidity conditions and has been applied in more than 100 project cases.
Conclusion
By deploying 23 Tongdy TG9 in-duct multi-gas monitoring transmitters, the Bangkok community shopping mall and residential complex successfully implemented an integrated air management solution combining precise gas monitoring and intelligent ventilation control.
The project not only improved occupant experience and indoor environmental quality but also established a strong reference for green, energy-efficient, and intelligent building upgrades.
For customized air quality monitoring solutions, please contact us for a dedicated technical proposal and professional support.
Post time: Apr-22-2026