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Tongdy MSD-18 IAQ PM2.5 PM10 CO2 TVOC HCHO Monitoring System
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Tongdy MSD-18 IAQ PM2.5 PM10 CO2 TVOC HCHO Monitoring System

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High-accuracy Mulit-sensor IAQ Detector
MSD - Commercial Grade for Intelligents & Green Buildings
(Model No.: MSD-18XXC/D)


Real-time collecting indoor air quality data of intelligent buildings/green buildings, also collecting outdoor data or official release data, upload the data to Cloud through monitoring analysis platform. Read and analyze the data using computer or cellphone. Achieve multi-parameter and all-direction
real-time monitoring and assessment of indoor air quality, and use it to control building ventilation and air conditioning system, etc.

  • Rigorous design, professional test and calibration for the commercial grade indoor air quality detector.
  • High performance with REST and WELL/LEAD Certificate, able to replace expensive professional instrument, coordinate well with data collection and analysis system, make multipoint real time monitoring placement easy to achiece
  • Sutiable for smart building, smart home system, air quality data collection system, green building evaluation system, ventilation system.


  • 24-hour online real-time detecting indoor air quality, upload measurment data.
  • The special and core mulit-sensor module is inside, which is designed for the commercial grade monitors. The whole sealed case aluminum structure ensures the stability of detection and improves the anti-jamming capability.
  • Unlike other particle sensors, with a built-in large flow bearing blower and the control technology of automatic constant flow, MSD has the much higer and long-term operation stability and life, of course more accuracy.
  • Providing multiple sensors such as PM2.5, PM10, CO2, TVOC, HCHO, temperature and humidity.
  • Using own patent technologies to minimize the influence form ambiance temperature and humidity to measured values.
  • Two power supply selectable: 18~2VDC or 100~240VAC
  • Communication interface is optional: RS485 Modbus, WIFI, RJ45 Ethernet.
  • Supply an extension TTL/RS485 port for preset or correction the measurements.
  • Three-colour ligh ring indicating different level of indoor air quality; the ligh ring can be turned off.
  • Ceiling munting and wall mounting with the tasteful appearance in different decoration styles.
  • Simple structure and installation, make even ceiling mounting easy and convenient.
  • RESET certified as the grade B monitor for Green Building Assessment and Certification.
  • Over 12-year experience in IAQ product design and production, abundantly applied in European and American market, mature technology, good manufacturing practie and high quality ensured.


  • Online real-time detecting indoor air quality
  • Green Building Assessment
  • BAS and HVAC systems
  • Smart Home System
  • Fresh Air Controlling System
  • Building Energy Saving Reconstruction and Assessment System
  • Classroom, office, exhibition hall, shopping mall, any public places


  • PM2.5/PM10 Data
    • Sensor: Laser partilce sensor, Light scattering method
    • Measuring Range: PM2.5: 0~800μg/m3, PM10: 0~800μg/m3
    • Output Resolution: 0.1μg∕㎥
    • Zero Point Stability: ±3μg∕㎥
    • Accuracy: 10% of reading (25℃, 10%~60%RH)
  • Temperature and Humidity Data
    • Sensor: High precision digital integrated temperature and humidity sensor
    • Measuring Range: Temperature︰-20℃~60℃ / Humidity︰0~99%RH
    • Output Resolution: Temperature︰0.01℃ / Humidity︰0.01%RH
    • Accuracy: Temperature︰<±0.5℃@25℃ / Humidity︰<±3.0%RH (20%~80%RH)
  • CO2 Data
    • Sensor: Non-Dispersive Infrared Detector (NDIR)
    • Measurement Range: 0 ~ 5,000ppm
    • Output Resolution: 1ppm
    • Accuracy: ±40ppm + 3% of reading (25℃, 10%~60%H)
  • TVOC Data
    • Sensor: TVOC
    • Measuring Range: 0~3.5mg/m3
    • Output Resolution: 0.001mg∕㎥
    • Accuracy: ±0.05mg+10% of reading (25℃, 10%~60%RH)
  • HCHO Data
    • Sensor: Electrochemistry Formaldehyde sensor
    • Measuring Range: 0~3.5mg/m3
    • Output Resolution: 0.001mg∕㎥
    • Accuracy: ±0.05mg+10% of reading (25℃, 10%~60%RH)
  • General Data
    • Detection Parameters(max.): PM2.5/PM10, CO2, TVOC, Temperature & RH, HCHO
    • Output:
      • RS485/RTU (Modbus)
      • RJ45/TCP (Ethernet) with an extra TTL/RS485 interface
      • WiFi @2.4 GHz 802.11b/g/n with an extra TTL/RS485 interface
    • Operating Environment: Temperature: 0~50℃ / Humidity︰0~99%RH
    • Storage Conditions: -10℃~50℃ / 0~95%RH (No condensation)
    • Power supply: 18~24VDC or 100~240VAC
    • Overall Dimension: 130mm(L) x 130mm(W) x 45mm(H)
    • Material of Shell: PC/ABS fire-proof material
    • IP Level: IP20
    • Standard Approval: CE-Approval

Products Models

Model PM2.5 PM10 Temp/RH CO2 TVOC HCHO Output
Ethernet RJ45
TTL or RS485
Ethernet RJ45
TTL or RS485
Ethernet RJ45
TTL or RS485
TTL or RS485

C: 12~36VDC power supply
D: 100~240VAC power supply