Nexelec SIGN 7-in-1 Room Sensor

The Nexelec SIGN is a 7-in-1 LoRaWAN room sensor that measures TVOC, CO2, temperature, humidity, presence, brightness, and noise in offices, homes, and other indoor environments. All measurements transmit wirelessly to a secure cloud platform for remote monitoring and data logging.

SIGN is Nexelec's most comprehensive room sensor, combining seven sensors with the iZiAiR on-board air quality algorithm in a single compact enclosure. A color-coded indicator light and audible signal alert occupants when ventilation is needed. SIGN is the only sensor in the Nexelec range that fits single-user flush-mounting boxes. Configuration is done wirelessly via NFC using the Nexelec TOUCH smartphone app — no tools, no wiring, no need to open the enclosure.

Key Features

• TVOC measurement: MOx (metal oxide) sensor, resolution 1 µg/m³, accuracy ±25%, range 0–10,000 µg/m³. Quickly identifies excessively high VOC concentration levels.
• CO2 measurement: NDIR sensor, resolution 1 ppm, accuracy ±(50 ppm + 3% of value), range 0–5,000 ppm. Analyzes air every 5 minutes; automatic weekly recalibration; manual calibration also possible.
• Temperature measurement: Resolution 0.1°C, accuracy ±0.2°C, range −30°C to +70°C
• Humidity measurement: Resolution 0.5% RH, accuracy ±2% RH, range 0–100% RH
• Presence detection: Passive infrared (PIR) motion sensor, 92° detection angle (vertical and horizontal), detects people up to 6 m away
• Brightness measurement: Resolution 5 lux, accuracy ±5 lux, range 0–5,000 lux — useful for lighting control or temperature adjustment based on sunshine levels
• Noise measurement: Resolution 1 dB, accuracy ±5 dB, range 35–120 dB — identifies noise pollution to help preserve a calm environment
• iZiAiR air quality algorithm: On-board algorithm analyzes up to 9 pollutants simultaneously, measures the concentration of each, and prioritizes their hazardousness to simplify interpretation and guide appropriate action.
• CO2 indicator light: Green/Orange/Red LED visible from over 10 m changes with CO2 level to alert occupants when ventilation is needed. ppm trigger threshold is reconfigurable via NFC or remotely via LoRaWAN.
• Audible signal tone: Notifies occupants when indoor air quality deteriorates. Can be activated or deactivated locally or remotely.
• Local data storage: Built-in micro SD card stores up to 10 years of measurements — data is preserved in the event of a network outage or power cut.
• USB-C socket: Universal connector for continuous mains power, eliminating the need for battery replacement in permanently installed deployments.
• Dual wireless connectivity: LoRaWAN and Sigfox (X565LS); LoRaWAN only (X565LR)
• Multi-band LoRaWAN: Configurable for EU868, US915, AU923, and other regional frequencies via NFC
• NFC configuration: Over 25 parameters adjustable via Nexelec TOUCH app — measurement interval, transmission interval, LED/buzzer indicators, radio frequency band, and more. Settings can be made through the packaging before the battery is installed.
• Data transmission modes: Periodic, on-change, and bundled datalog with redundancy (each frame sent three times to maximize gateway reception)
• End-to-end encryption: Double AES-128 encryption on all transmitted data
• Long battery life: Up to 20 years(1) with two SAFT LS14500 2600 mAh lithium batteries (both included)
• On-demand measurement: Front button triggers an immediate measurement and data transmission
• Anti-tamper: Lockable mounting base; alert message sent if the sensor is removed
• Mounting: Free-standing, wall-mounted (screws/plugs included), flush-mounting box compatible, or 3M adhesive fastener (included) — no drilling required
• 270° air circulation: Numerous side openings for better ambient air sampling
• Calibration: Calibration certificate for CO2, temperature, and humidity measurements from a COFRAC-accredited independent metrology laboratory
• Regulatory compliance: Direct-reading NDIR CO2 sensor compliant with French and international standards for measuring CO2 concentration in indoor air
• Certifications: CE, UKCA, FCC

Applications

• Comprehensive indoor air quality monitoring in offices, classrooms, and public buildings
• VOC exposure monitoring in offices, workshops, and spaces with chemical or cleaning product use
• Ventilation control and HVAC automation based on CO2 levels, VOC, and occupancy
• Lighting and energy optimization based on presence and brightness
• Acoustic monitoring and noise pollution management
• Regulatory compliance monitoring for indoor air quality standards
• Facility management and building automation
• Large-scale IoT sensor deployments via LoRaWAN or Sigfox networks
• Integration with NAVIXIS IoT platform for dashboard visualization, threshold alerts, and data export

Important Notes

• Intended for indoor use only. Operating range: −20°C to +50°C, 0–99% RH non-condensing.
• NDIR CO2 sensor requires a minimum ambient CO2 level of about 400 ppm for several consecutive hours to maintain automatic recalibration accuracy. Suitable for offices, classrooms, and shared spaces; not recommended for spaces that are never unoccupied or never ventilated.
• The TVOC sensor uses MOx technology. MOx sensors respond to a broad range of volatile organic compounds and report a total VOC index; they do not identify or quantify individual compounds.
• Battery life is significantly affected by the VOC sensor's continuous power draw. The USB-C socket is recommended for permanent installations where battery replacement is impractical. Use the Nexelec VOLT tool to calculate projected autonomy for your deployment.
• LoRaWAN gateway and network server not included. A LoRaWAN or Sigfox network must be available at the installation site.
• NFC configuration requires the free Nexelec TOUCH app (Android or iOS).
• The X565LR variant supports LoRaWAN only; the X565LS variant supports both LoRaWAN and Sigfox.

Specifications

Technical Documents

• DataSheet

Contact us if you need a different connectivity and frequency band option.

LoRa is a registered trademark of Semtech Corporation. LoRaWAN is a trademark of the LoRa Alliance. Sigfox is a registered trademark of Sigfox S.A. MCCI and MCCI Catena are registered trademarks of MCCI Corporation. All other trademarks are the property of their respective owners.