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Smart Sensing, Green Living
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Professional and reliable indoor air quality (IAQ) and gas monitoring solutions for commercial buildings, HVAC systems, and green infrastructure. Empower data-driven decisions with high-accuracy sensors from Tongdy.

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Tongdy Sensing – Air Quality Monitoring Expert

Since 2009, Tongdy has been a leading manufacturer of professional air quality and gas monitoring solutions. We specialize in high-accuracy sensors for CO2, TVOC, PM2.5, CO, Ozone, temperature, humidity, and more — designed for integration into Building Automation Systems (BAS), HVAC controls, and green building projects.

Our products are used in over 100 commercial buildings worldwide, including offices, shopping malls, schools, luxury residences, and fitness centers. With certifications including CE, FCC, ICES, and RESET, Tongdy ensures compliance, reliability, and long-term performance.

  • 20+ series of CO2 monitors and controllers
  • Multi-sensor monitors with up to 12 parameters
  • Support for Modbus, BACnet, MQTT, Wi-Fi, LoRaWAN, 4G
  • Data logging with 3–12 months storage
Tongdy PGX Super Indoor Monitor

Used in commercial buildings, offices, and green infrastructure

Our Products & Solutions

Comprehensive air quality monitoring systems for indoor, outdoor, and duct environments. All products feature high accuracy, long lifespan, and seamless integration with building management systems.

PGX Super Indoor Environment Monitor

PGX Super Indoor Environment Monitor

Real-time monitoring of up to 12 parameters: CO2, PM2.5, PM10, TVOC, Temp & RH, CO, HCHO, Noise, Illuminance.

  • ✔ BACnet-IP, Modbus, MQTT, Wi-Fi, LoRaWAN
  • ✔ Data logger (3–12 months storage)
  • ✔ AQI display & primary pollutant identification
  • ✔ Commercial-grade accuracy and stability
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CO2 Monitor and Controller

CO2 Monitor and Controller (Model: G01-CO2-P)

High-quality NDIR CO2 sensor with self-calibration and 10+ year lifespan. Ideal for offices, schools, and upscale residences.

  • ✔ Three-color backlight LCD (low/medium/high CO2)
  • ✔ Data logger with Bluetooth download
  • ✔ Wi-Fi or RS485 interface
  • ✔ Multiple power options: 24VAC, 100–240VAC, USB, battery
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Outdoor Air Quality Monitor

Outdoor Air Quality Monitor (Model: TF9)

Solar-powered outdoor monitor for PM2.5, PM10, Ozone, CO, CO2, and TVOC. Designed for tunnels, underground areas, and urban environments.

  • ✔ Optional solar power supply
  • ✔ Constant airflow fan for stability
  • ✔ RS485, Wi-Fi, RJ45, or 4G connectivity
  • ✔ Remote diagnostics and calibration
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VAV and Dew-proof Thermostat

VAV and Dew-proof Thermostat

Precision temperature and humidity control for variable air volume (VAV) systems. Resistant to condensation and high humidity.

  • ✔ High-accuracy sensing in humid environments
  • ✔ Supports Modbus and BACnet protocols
  • ✔ Wall-mounted design with clear display
  • ✔ Ideal for data centers, labs, and hospitals
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CO and O3 Controller

CO and O3 Controller (Model: TKG-GAS)

Split-installation controller with external sensor probe for ducts, cabins, or enclosed spaces. Monitors carbon monoxide and ozone.

  • ✔ Built-in fan for uniform air sampling
  • ✔ Relay output + 0–10V / 4–20mA analog output
  • ✔ RS485 interface for integration
  • ✔ Used in parking lots, storage, and disinfection systems
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TVOC and PM2.5 Monitor

TVOC and PM2.5 Monitor

Dedicated monitor for volatile organic compounds and fine particulate matter. Provides real-time data for health and safety compliance.

  • ✔ High-sensitivity MOS and laser scattering sensors
  • ✔ Real-time curve visualization
  • ✔ Wi-Fi, Ethernet, or RS485 connectivity
  • ✔ Suitable for schools, offices, and clinics
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CO2 Sensor Module

CO2 Sensor Module (Telaire by Amphenol)

High-performance NDIR CO2 sensor module for OEM integration into HVAC, air purifiers, and smart thermostats.

  • ✔ 10+ year lifespan with automatic baseline calibration
  • ✔ UART and I2C output options
  • ✔ Low power consumption
  • ✔ Industry-proven reliability
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Greenhouse CO2 Control

Greenhouse CO2 Control System

Precision CO2 enrichment control for agricultural greenhouses to optimize plant growth and yield.

  • ✔ High-accuracy NDIR sensing
  • ✔ Programmable setpoints and alarms
  • ✔ Supports 4–20mA and relay outputs
  • ✔ Weather-resistant housing for farm use
View Details

Why Choose Tongdy?

Engineered for performance, reliability, and seamless integration.

10+

10+ Year Lifespan

NDIR sensors with self-calibration ensure long-term accuracy and minimal maintenance.

12

12 Parameters

Monitor CO2, PM2.5, TVOC, temperature, humidity, noise, light, and more in one device.

BAC

BACnet & Modbus

Full support for BACnet-IP, BACnet-MS/TP, Modbus-RTU, and Modbus-TCP.

☁️

Cloud & Data Logging

Store up to 12 months of data and access via cloud platforms or local download.

20+
CO2 Product Series
100+
Commercial Buildings
14
Years of Innovation
CE, FCC, ICES
Global Certifications

Get in Touch

For product inquiries, technical support, or custom solutions, visit the official Tongdy website to connect with their team.

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