The Nexelec TRACK+ RAIL is an air quality monitoring station designed specifically for underground railway stations. It measures fine particulate matter (PM1, PM2.5, PM5), CO2, temperature, humidity, and atmospheric pressure using a PM sensor optimized for the iron-rich brake and wheel dust characteristic of underground rail environments. TRACK+ RAIL supports LoRaWAN and optional 4G LTE connectivity with local SD card data logging. Based on the TRACK+ outdoor platform, TRACK+ RAIL substitutes a rail-specific PM sensor for the standard outdoor unit, adds a CO2 channel, and shares the same modular BLOCK architecture for future sensor extensions. Power supply adapts to site conditions: AC mains, DC voltage, LFP battery, or optional solar panel. Key Features Fine particle measurement (PM) — optimized for underground railways: Sensor specifically designed to measure fine particles characteristic of underground rail environments (PM1, PM2.5, PM5 by mass). Laser optical sensing with AirFlow 360° sampling. Air is heated before measurement to eliminate the effect of ambient humidity on readings. Validated by an independent metrology laboratory. Mass measurement range: 0–1,000 µg/m³. CO2 measurement: Resolution 1 ppm, accuracy 30 ppm or ±3%, range 0–10,000 ppm — monitors ventilation effectiveness and occupant comfort in underground stations. Temperature measurement: Resolution 0.1°C, accuracy ±0.3°C, range −30°C to +70°C Humidity measurement: Resolution 0.5% RH, accuracy ±2% RH, range 0–100% RH Atmospheric pressure: Resolution 1 hPa, accuracy ±2.5 hPa, range 300–1,100 hPa AirFlow 360°: Well-ventilated aerosol sampling system allows fine particles to enter from all angles without blind spots, while providing effective protection against the environment. BLOCK modular expansion: 5 slots for adding measurement cartridges (ozone, NO2, and other gases), ensuring flexibility and scalability without replacing the station. LoRaWAN connectivity: LoRaWAN standard (X951LS). Open protocol — measurements can be used freely in any compatible monitoring software. 4G LTE connectivity (optional, P061 CELLULAR): Multi-operator SIM card supplied with the station, providing network coverage in over 150 countries. Includes 5 years' access to the NAVIXIS web platform. Local data logger: Built-in SD card stores up to 20 years of measurements in CSV format — ensures data continuity in radio dead zones or network outages. Flexible power supply: Operates on AC mains (110–230V), DC voltage (5–35V), or LFP lithium battery (100 Wh, up to 3 days autonomy). Optional solar panel kit (P066). Battery recharges automatically when mains power is restored. NFC configuration: Configuration, diagnostics, and firmware updates via the Nexelec TOUCH mobile app over NFC. End-to-end encryption: Double AES-128 encryption on all transmitted data LED status indicators: Status of the various station components visible via onboard LEDs. Reduced maintenance: No maintenance required for the PM sensor for 1 year in standard configuration. Wearing parts (PM sensor, battery) are replaceable on site without removing the station from its mount. Insect barrier: Integrated pest screen preserves measurement reliability and is easy to maintain. Simple installation: Wall mounting kit and pole mounting kit both included. Pole kit fits diameters from 60 to 400 mm. Standard tools only (Phillips screwdriver). NAVIXIS platform integration: Measurement visualization, CSV export, API/webhook connection, configurable email and SMS alerts, fleet management. Certifications: CE Applications Fine particle monitoring in metro, subway, and underground railway stations Brake and wheel dust exposure monitoring on station platforms and concourses CO2-based ventilation monitoring in underground passenger spaces Regulatory compliance monitoring for underground rail air quality standards Fleet management of monitoring stations across multiple underground sites Integration with NAVIXIS platform for dashboard visualization, threshold alerts, and data export Important Notes Designed for use in underground railway environments and equivalent sheltered outdoor installations. Operating range: −20°C to +60°C, 0–95% RH non-condensing. The PM sensor is optimized for underground railway fine particles. It measures PM1, PM2.5, and PM5 only — PM0.5 and PM10 channels are not available on this variant. PM sensor maintenance interval is 1 year in standard configuration, shorter than the 5-year interval on the standard TRACK+ outdoor station. 4G LTE connectivity (P061 CELLULAR) and solar power kit (P066) are optional — contact us to discuss your configuration. BLOCK sensor cartridges (ozone, NO2, and other gases) are ordered separately. Up to 5 BLOCK slots available per station. LoRaWAN gateway not included. A LoRaWAN network must be available at the installation site when using LoRaWAN connectivity. LFP battery autonomy of 3 days is standard; actual autonomy depends on configuration and measurement frequency. Specifications Particulate Matter (PM) Channels (by mass) PM1, PM2.5, PM5 Sensor optimization Designed for underground railway fine particles Resolution 1 µg/m³ or 1 pcs/cm³ Repeatability error
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