In-duct air quality detector

Short Description:

  • Professional designing and manufacturing IAQ products more than 14 years, long-term exportation to global markets with powerful performances guaranteed
  • Built-in commercial high-precision sensor module, with proprietary technology, long-term stable and reliable application
  • Industrial grade shell and structure to satisfy different environment.
  • Removable filter mesh for easy cleaning and reuse Pitot tube inlet and outlet design, instead of air pump for the long lifetime usage
  • Regulate fan speed automatically to guarantee constant air volume
  • Provide a variety of communication interface to select and connect a monitoring and analysis software platform, for data storage, analysis and comparison
  • Optional two power supply, more convenient for installation
  • RESET Certificate CE-Approval

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Brief Introduction

Product Tags

In-Duct Air Quality Detector PMD Series


• PMD-18 in-duct air quality detector is specially designed for monitoring multi-parameter air quality in air duct, Which is installed in wind duct or return air duct.
• The built-in sensor module uses Tongdy’s patented data algorithm, with enclosed cast aluminium structure. It ensures the stability, air closure and shielding, greatly improves the anti-interference ability.
• Built-in a large air bearing fan, regulate the fan speed automatically, guarantee constant air volume and improve the stability and lifetime in long-term working.
• Special design of pitot tube, instead the air pump mode, adapt to a wider range of wind speeds. To have longer lifetime and no need to change the air pump frequently.
• Easy to clean filter mesh, can be disassembled and used many times
• With temperature and humidity compensation, reduce the impact of environmental change.
• Real-time monitoring parameters: particles (PM2.5 and PM10), carbon dioxide (CO2), TVOC, air temperature and humidity, as well as optional carbon monoxide or formaldehyde,.
• Independently measure the temperature and humidity in the air duct, avoid interference from other sensors and monitoring heating.
• Provides WIFI, RJ45 Ethernet, RS485 Modbus communication interfaces selection. Provide multiple communication protocol choices.
• Connect to the data acquisition/analysis software platform to achieve data storage, data comparison and data analysis.
• Data can be read and displayed on-site with blue tooth or the operation tool.
• Working with MSD indoor air quality monitors together, comprehensively and accurately analyze the air quality. Quantitative assessment of indoor air pollution.
• Working with TF9 series outdoor air environment monitors together to form a partial and complete regional air quality monitoring, analysis and treatment system.


General Data
Power Supply 12~28VDC/18~27VAC or 100~240VAC (optional)
Communication Interface Choose one in the following
  1. RS485
RS485/RTU9600bps 8N1(default), 15KV Antistatic protection
  1. RJ45(Ethernet TCP)
MQTT protocol, Modbus customization or Modbus TCP optional
  1. WiFi@2.4 GHz 802.11b/g/n
MQTT protocol, Modbus customization or Modbus TCP optional
Data upload interval cycle Average / 60 seconds
Applicable air speed of duct 2.0~15m/s
Working Condition -20℃~60℃/ 0~99%RH, (No condensation)
Storage Condition 0℃~50℃/ 10~60%RH
Overall Dimension 180X125X65.5mm
Pitot tube size 240mm
Net weight 850g
Shell material PC material
CO2 Data
Sensor Non-Dispersive Infrared Detector (NDIR)
Measuring Range 02,000ppm
Output Resolution 1ppm
Accuracy ±50ppm + 3% of reading or ±75ppm  (whichever is bigger)  25, 10%~80%RH
Particle Data
Sensor Laser particle sensor
Measuring Range PM2.5: 0~500μg/㎥  PM10: 0~500μg/㎥;
Output values moving average/60 seconds,  moving average/1 hour,  moving average/24 hours
Output Resolution 0.1μg/
Zero Point Stability <2.5μg/
PM2.5 Accuracy (mean per hour) <±5μg/㎥+10% reading0~300μg/㎥ @10~3010~60%RH
Sensor Metal oxide sensor
Measuring Range 03.5mg/m3
Output Resolution 0.001mg/m3
Accuracy <±0.05mg/m3+ 15% of reading25, 10%~60%RH
Temp.& Humi. Data
Sensor Band gap material temperature sensor、Capacitive humidity sensor
Temperature range -20℃~60℃
Relative humidity range 0~99%RH
Output Resolution Temperature: 0.01℃        humidity:0.01%RH
Accuracy ±0.5℃,3.5%RH(25℃, 10%~60%RH)
CO Data (option)
Sensor Electrochemical CO sensor
Measuring Range 0100ppm
Output Resolution 0.1ppm
Accuracy ±1ppm+ 5of reading(25℃, 10%~60%RH)
OZONE (option)
Sensor Electrochemical Ozone sensor
Measuring Range 0~2000ug∕ @200~2mg/m3
Output Resolution 2ug∕
Accuracy ±20ug/m3+ 10of reading(25℃, 10%~60%RH)
HCHO Data (option)
Sensor Electrochemical Formaldehyde sensor
Measuring Range 0~0.6mg∕
Output Resolution 0.001mg∕
Accuracy ±0.005mg/+5% of reading  (25℃, 10%~60%RH)

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