Tongdy
PMD-1818C
In-Duct Mount Air Quality Monitor
Track particles, gases, temperature, and humidity directly in your air ducts with a durable, low-maintenance system designed for precise, continuous performance.
Note: All Tongdy monitors and controls ship direct from the factory. Please allow 10-15 business days for shipping and handling.
Its advanced sensors track PM2.5, PM10, CO2, TVOC, and optionally formaldehyde and CO, alongside temperature and humidity, ensuring comprehensive air quality assessment. Equipped with a large air-bearing fan, it maintains consistent airflow by automatically adjusting fan speed, promoting stability and device longevity. Remote monitoring and real-time diagnostics allow for accurate data correction throughout the device's lifecycle, guaranteeing dependable, continuous performance in demanding duct environments.
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Monitors PM2.5, PM10, CO2, TVOC, temperature and humidity (optional CO or formaldehyde)
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Stable, anti-interference design with patented sensor algorithm and cast aluminum housing
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Built-in fan and pitot tube system for constant airflow, long lifetime, and low maintenance
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Reusable filter mesh for easy cleaning and reduced upkeep costs
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Temperature/humidity compensation for more accurate readings
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Multiple communication options: WiFi, Ethernet, RS485 Modbus
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Integrates with indoor and outdoor monitors for complete air quality management
| Power Supply | 12~28VDC/18~27VAC or 100~240VAC (optional) |
| Communication Interface | Choose one in the following |
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RS485/RTU，9600bps 8N1(default), 15KV Antistatic protection |
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MQTT protocol, Modbus customization or Modbus TCP optional |
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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 | 0～2,000ppm |
| 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% reading（0~300μg/㎥ @10~30℃，10~60%RH） |
| TVOC Data | |
| Sensor | Metal oxide sensor |
| Measuring Range | 0～3.5mg/m3 |
| Output Resolution | 0.001mg/m3 |
| Accuracy | <±0.05mg/m3+ 15% of reading（25℃, 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 | 0～100ppm |
| Output Resolution | 0.1ppm |
| Accuracy | ±1ppm+ 5% of reading（25℃, 10%~60%RH） |
| OZONE (option) | |
| Sensor | Electrochemical Ozone sensor |
| Measuring Range | 0~2000ug∕㎥ @20℃（0~2mg/m3） |
| Output Resolution | 2ug∕㎥ |
| Accuracy | ±20ug/m3+ 10% of 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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