Engineered for Commercial HVAC Systems, Institutional Facilities, and Building Automation Protocols
High-Precision Environmental Sensing for the Midwest's Commercial, Cold-Climate, and Industrial Sectors
As the primary economic and architectural hub of the American Midwest, the Chicago metropolitan area presents distinct environmental, structural, and regulatory criteria for indoor environmental monitoring. From the high-density corporate skyscrapers of the Chicago Loop and Fulton Market district to the sprawling pharmaceutical, cold storage, and heavy logistics facilities stretching across Cook County and the I-55 corridor, accurate carbon dioxide (CO2) transmitter deployment is essential for continuous energy conservation, worker safety, and building performance compliance.
Chicago's extreme seasonal temperature swings—from bitter winter freezes to humid summer peaks—make building envelope sealing and controlled mechanical ventilation essential. Under the Chicago Energy Transformation Code and regional ASHRAE 62.1/90.1 implementation, unchecked outside air introduction causes excessive boiler and chiller load. Advanced NDIR CO2 transmitters serve as the primary input for Demand-Controlled Ventilation (DCV), allowing commercial facility directors to modulate fresh air dampers precisely based on actual occupant load, reducing annual HVAC heating/cooling costs by up to 30%.
Across Illinois and surrounding states, local engineering firms and HVAC contractors deploy our gas transmitters across targeted local industry sectors:
Integrated BACnet/Modbus duct and wall transmitters providing continuous indoor baseline metrics for LEED Platinum and WELL Building certifications in downtown architectural landmarks.
Industrial fermentation plants, breweries, packaging units, and chilled storage centers requiring rapid NDIR CO2 leak monitoring to safeguard personnel against asphyxiation risks.
Universities, healthcare corridors, and research laboratories across Chicagoland leveraging multi-parameter sensors to optimize cognitive comfort and ensure infection control standards.
Pioneering Air Quality & Gas Sensing Technology for over 20 Years
Help you build and maintain a healthy indoor environment.
Our work makes a difference in helping you make the healthy indoor air quality. As one of the earliest companies engaged in air quality monitoring products, Tongdy has been always focusing on its strong technology development and design capabilities on indoor air quality monitors.
We foster research and development on obtaining accurate air quality data, helping you well understand and improve the air you breathe by quantitative assessment and data analysis. For pursuing our ultimate purpose of creating healthy indoor air quality, we’re committed to obtaining real and accurate data and cultivating the next generation of innovators in technology and engineering.
Engineered for Demanding Commercial, Industrial, and Smart City Deployments
Proprietary technology and self-calibrating algorithms support consistent data accuracy across harsh Midwest climate swings without baseline drift.
Special multi-sensor module featuring a sealed cast aluminum structure containing up to six internal gas and environmental sensors for comprehensive IAQ tracking.
Tongdy-owned testing facilities and continuous investment in sensor research guarantee hardware reliability, IP ratings, and zero-defect deployments.
The "MyTongdy" Cloud Platform and API integrations enable real-time tracking and historical diagnostic logging on PC or mobile software suites.
Over 20 years of experience delivering commercial-grade accuracy, enabling facility engineers to make data-driven decisions that foster human health.
Modular communication interfaces (BACnet MS/TP, BACnet IP, Modbus RTU, 0-10V, 4-20mA, LoRaWAN, Wi-Fi) allow seamless connection with BMS systems.
Supporting Human-Centric Environments & Sustainable Architecture
Tongdy actively develops air quality monitors and is devoted to healthy indoor air quality, striving to become an excellent enterprise model. As a corporate citizen, Tongdy has contributed to public welfare undertakings such as cooperating with public benefit organizations like WELL—the world’s leading organization focused on deploying people-first places to advance a global culture of health, exploring the direct impact of indoor air quality based on The WELL Building Standard™.



Leading the Transition to Smart, Resilient, and Low-Emission Smart Buildings
The carbon dioxide monitoring landscape is undergoing rapid technological evolution across North America. Key trends shaping commercial specifications in major metropolitan areas like Chicago include:
1. Dual-Beam NDIR Technology vs. Traditional Single-Channel Sensors: In continuous-occupancy industrial spaces such as hospitals, data centers, and cold chains, typical ABC (Automatic Baseline Calibration) logic fails due to lack of zero-occupancy periods. Dual-wavelength NDIR sensors with active reference channels ensure long-term stability and eliminate manual field calibration cycles.
2. Edge Computing and Direct IoT Building Cloud Integration: Modern transmitters feature onboard data logging and native IoT transmission (Wi-Fi, RJ45 Ethernet, LoRaWAN), enabling independent data redundancy. If a Central BMS fails, transmitters retain historical trends and transmit telemetry directly to local facility monitoring platforms.
3. Comprehensive Multi-Gas Modular Detection: Energy-efficient ventilation relies not only on CO2, but also on real-time correlation with Total Volatile Organic Compounds (TVOC), Carbon Monoxide (CO), Fine Particulates (PM2.5/PM10), and relative humidity to dynamically balance indoor health with HVAC thermal energy efficiency.
Engineered for In-Duct, Ambient Room, and Multi-Gas Industrial Applications
Indoor Air Quality Monitor for CO2 TVOC
Carbon Monoxide Monitor and Controller
Duct CO2 Transmitter with Temp.&RH
Duct Air Quality CO2 TVOC Transmitter
Dual Channel CO2 Sensor
CO2 Monitor with Wi-Fi RJ45 and Data Logger
Carbon Dioxide Monitor Alarm with 3-color LCD and Buzzer
Professional In-Duct Air Quality Monitor