PMDuct
In-duct particulate matter monitoring probe for HVAC and filtration systems
PMDuct is a complete particulate matter monitoring probe designed for direct installation in HVAC, filtration and industrial air-handling systems.
It integrates NextPM Advanced with a controlled sampling architecture so that the airflow through the sensing element can be managed independently from the main duct airflow.
The probe provides PM₁, PM₂.₅ and PM₁₀ measurements together with temperature and relative humidity, with Modbus RS485 RTU communication for integration into industrial monitoring and control systems.
- Controlled in-duct sampling
- PM₁ / PM₂.₅ / PM₁₀
- Up to 10,000 µg/m³
- Modbus RS485 RTU
Designed for particulate measurement in duct environments
In HVAC ducts, pressure, air velocity and installation geometry can influence the sampling conditions seen by a particle sensor.
PMDuct uses a dedicated pump-based sampling architecture so that the measurement flow can be controlled separately from the main duct airflow.
Controlled sampling
A dedicated pump generates the measurement flow independently from the main duct airflow.
NextPM Advanced sensing
PM₁, PM₂.₅ and PM₁₀ measurement based on the NextPM Advanced optical architecture.
High concentration range
Measurement range up to 10,000 µg/m³.
Industrial communication
Modbus RS485 RTU for integration into HVAC, BMS, SCADA and industrial control architectures.
Technical specifications
Main measurement, sampling, communication and environmental specifications.
| Designation | Values |
|---|---|
| GENERAL | |
| Measured parameters | PM₁/PM₂.₅/PM₁₀ in µg/m³Temperature in °CRelative Humidity in % |
| PM Concentration Range | 0 - 10 000 µg/m³ |
| PM Size Detection range | 0.3 µm to 10 µm |
| PM Repeatability | < 3% |
| Communication | RS485 to PLC or Gateway system |
| Internal Pumping System | Optimized to operate even for high air speed rate |
| Measurement frequency | |
| Normal Mode | 1 measure every 15 minutes |
| Forced Mode | Continuous (maintenance time impacted) |
| Maintenance | Every 2 years with Sensor Kit achievable on site(without service interruption) |
| Power supply | 24 V (+/- 10%) - <0.5 A(Other voltages available) |
| Dimensions and weight | H 121 mm x L 116 mm x P 73 mm (+ tubing) | < 1kg |
Resources for integrating PMDuct
Electrical, communication and installation documentation is available for HVAC and industrial-system integration.
Modbus RS485 RTU
Industrial communication for continuous data acquisition.
M12 connectors
Industrial connection format for installation and servicing.
BMS / SCADA integration
PM data can be integrated into existing supervision and control architectures.
NextPM Advanced sensing performance and calibration options
PMDuct is based on NextPM Advanced sensing technology. Available documentation includes concentration-range specifications, repeatability data and calibration options derived from the NextPM platform.
Sensing technology
- NextPM Advanced
- Dual-angle optical detection
- Humidity management
Calibration
Standard, Verified and Adjusted configurations exist on the NextPM platform. Contact TERA Sensor to confirm the configuration supplied with your PMDuct order.
Technical data
- Concentration range
- Repeatability
- Sampling architecture
- Operating conditions
Upstream monitoring in critical environments
In cleanrooms and contamination-sensitive production environments, PMDuct can provide particulate information inside the supply-air system before the air reaches the monitored room or process area.
Explore Cleanroom & Contamination Monitoring →Integrating particulate monitoring into an HVAC system?
Probe position, sampling architecture, airflow conditions, enclosure, electrical integration, communication and calibration strategy can all influence in-duct measurement performance.
TERA Sensor can support the sensing and HVAC integration architecture; TERA Tronics can extend the project when custom electronics, firmware, mechanics, gateways or product development are required.
FAQ
NextPM Advanced is an OEM sensing architecture with an external pump, intended for manufacturers designing their own sampling system. PMDuct is a complete in-duct probe built around NextPM Advanced, with its own enclosure, controlled sampling path and Modbus RS485 RTU communication, ready for direct installation.
A dedicated pump generates the measurement flow independently from the main duct airflow, so that duct pressure and air velocity do not directly dictate the sampling conditions seen by the sensing element.
Pressure and air velocity in a duct can influence the flow reaching a directly exposed sensor. PMDuct's pump-based sampling manages this influence rather than eliminating it entirely; installation conditions should still be considered when interpreting the data.
PMDuct measures PM₁, PM₂.₅ and PM₁₀ mass concentrations, together with temperature and relative humidity.
PMDuct covers a concentration range of 0 to 10,000 µg/m³, based on the NextPM Advanced sensing architecture.
Yes. PMDuct communicates over Modbus RS485 RTU, which integrates directly into building management and SCADA systems.
Yes. PMDuct can be installed at different points in a filtration or air-treatment system to compare particle conditions before and after filtration stages, supporting investigation rather than automated pass/fail certification.
