7-in-1 room sensor

  • Intelligent and connected

    Intelligent and connected

    On-board data analysis algorithm. Remote reading of measurements. All information is available in a secure cloud space

  • Design


    Facilitates product acceptance by occupants

  • Humidity

  • CO2

  • VOCS

  • Noise

  • Brightness

  • Presence

  • LoRaWAN

The connected room sensor designed for professionals

The data collected by room sensors is essential to the smooth operation of many buildings.

Our products offer exceptional reliability, stable IoT connectivity, long battery life and consistently accurate measurements.

Easy to manage and configure, they can be deployed in large numbers to ensure efficient operations and satisfied customers.

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CO2 sensor / Lorawan sensor / sonde CO2 connectée

Monitors Indoor Air Quality and controls VOC emissions

SIGN is equipped with a Total Volatile Organic Compounds (TVOC) sensor based on highly sensitive MOx detection technology. This ensures reliable measurement even in damp and dusty environments.

Volatile Organic Compounds (VOCs) are highly volatile and easily dispersed in office or workshop atmospheres. VOCs can be harmful to health, and contribute to olfactory pollution.

SIGN allows you to manage ventilation in enclosed spaces and protect occupants’ health by limiting exposure to pollutants.

The algorithm adjusts to available measurement data and quickly assesses air quality. It can analyze up to 9 pollutants simultaneously, measuring the concentration of each and prioritizing their hazardousness. In this way, appropriate measures can be taken to meet the specific conditions of your environment.

Monitor CO2 at a glance!

SIGN analyzes CO2 levels every 5 minutes and visually alerts occupants when it’s time to ventilate to renew indoor air

CO2 sensor / Lorawan sensor / sonde CO2 connectée

Measurement accuracy

Calibration certificate issued by a COFRAC-accredited metrology laboratory. The CO2 sensor analyzes the air every 5 minutes and automatically recalibrates every week (manual calibration possible).

Regulatory compliance

Take control of your environment by ensuring healthy indoor air. Direct-reading sensor compliant with French and international standards for measuring CO2 concentration

Indicator light visible from over 10 metres

The powerful Green / Orange / Red indicator changes with the CO2 level. ppm" trigger threshold can be reconfigured locally via wireless NFC or remotely via LoRaWAN

Comprehensive environmental monitoring

With its 3 dedicated sensors, SIGN offers lighting and energy optimization, acoustic monitoring, space and safety management, and automation scenario options

Sound under control

Measures noise and identifies noise pollution. Helps preserve a calm and peaceful environment

Presence detection

The motion sensor detects people up to 6 meters away. Useful for lighting, security or temperature control

Measures ambient light

The brightness sensor measures the amount of light in the room. Ideal for controlling lighting or adjusting temperature more quickly according to sunshine levels
CO2 sensor / Lorawan sensor / sonde CO2 connectée

Reliable, precise temperature and humidity measurements

To avoid any risk of erroneous measurements, particular attention has been paid to integrating the temperature and humidity sensors into the product.

Rigorous testing and strict validation protocols guarantee operation in extreme operating conditions ranging from -20°C to +50°C and from 0 to 99% ambient humidity

Sound and light feature / sécurité incendie

Long-term measurement reliability

Guaranteed consistency and accuracy, with no measurement drift over time

Regulatory compliance

Sensor calibration certificate issued by a COFRAC-accredited independant metrology laboratory


Accuracy: +/- 2% RH


Accuracy: +/- 0.2°C

Fast and secure installation

3M adhesive fastener

Allows quick installation without screws or plugs. Avoids drilling into walls where asbestos, pipes or cables are present

Easy to install

Free-standing, wall-mounted or for single-user flush-mounting boxes

Anti-theft protection

Lockable mounting base reduces risk of sensor removal

Anti-tear detection

Triggers an alert message if the product is removed from its mounting base
CO2 sensor / Lorawan sensor / sonde CO2 connectée

Superior performance for optimal LoRaWAN® data transmission

CO2 sensor / Lorawan sensor / sonde CO2 connectée

Multi-band LoRaWAN transceiver

With the Nexelec TOUCH application and NFC technology, you can quickly and easily configure the product to transmit on the frequency of your choice: Europe (868MHz), USA (915MHz), Australia (923MHz), etc.

No more data loss!

Historical Data mode + Redundancy function: measurements can be grouped in a single LoRaWAN frame to limit the number of radio transmissions and are sent 3 times to maximize their reception by the network gateway.

Optimized PCB radio antenna

Designed to ensure reliable radio connectivity, even in harsh environments, while limiting power consumption to extend battery life

Enhanced cyber security

Data transmitted by the product is secured from end to end using double AES128 encryption.

QR'LOOK simplifies the use of room sensors

Are you deploying thousands of sensors on your property, and want to make your residents aware of how to use room sensors?

Enhanced security

QR'LOOK is a QR Code label to be stuck near the sensors so that occupants can learn how to use them optimally thanks to our advice

Information always at hand

Occupants simply scan the QR Code to access an online web page containing all the information they need on their sensor: operation, use, maintenance, downloadable instructions, videos, etc.

NAVIXIS: the IoT platform that saves you time

Smoke detector. 10-year battery / Détecteur de fumée

Connect and control your LoRaWAN equipment

Real-time alerts or alerts triggered by thresholds

Dashboard and data visualization

Graphical analyses and PDF reports

User rights management


  • Volatile Organic Compounds

    Volatile Organic Compounds

    Res. 1 μg/m3
    Prec. : 25%
    Measurement range: 0 to 15.000 μg/m3

  • Presence


    Technology: Passive infrared (PIR)
    Angle: 92° (Vertical and Horizontal)
    Detection distance: 6m

  • Brightness


    Res. : 5 lux
    Prec. : ±5 lux
    Measurement range: 0 to 5.000 lux

  • Noise


    Res. : 1 dB
    Prec. : ±5 dB
    Measurement range: 35 to 120 dB

  • Carbon Dioxide

    Carbon Dioxide

    Res. 1 ppm
    Prec. ±(50 ppm + 3% of value)
    Measurement range: 0 to 5.000 ppm

  • Temperature


    Res. : 0.1°C
    Prec. : ±0.2°C
    Measurement range: -30°C to +70°C

  • Humidity


    Res. 0.5% R.H.
    Prec. : ±2% R.H.
    Measurement range: 0 – 100% R.H.


  • Connectivity

    • Smoke alarm. 10-year battery / Détecteur de fumée
  • Power supply

    2 battery slots
    1 USB-C socket

  • Conditions of use

    Indoor environment
    Temperature: -20°C to +50°C
    Humidity: 0% RH to 99% RH (non-condensing)

  • Data transmission mode

    On change
    Bundled data (datalog) with transmission redundancy

  • Mounting type

    Wall-mounted or free-standing

  • Warranty

    2 years**

  • Set contents

    1 sensor
    2 batteries included
    1 micro SD memory card
    1 mounting base
    2 nylon screws and plugs
    1 3M® adhesive fastener

  • Certification


Reference Radio Frequency
X565LS LoRaWAN - Sigfox EU868 MHz

Easy installation

Thanks to the product video unboxing, installation and commissioning of SIGN go off without a hitch.

Play video

Autonomy of over 3 years*

  • Very low power consumption for sensors and on-board electronics
  • Includes 2 SAFT 2600 mAh high-density replaceable batteries
  • Includes 1 USB-C socket if you want to power the product continuously without having to worry about replacing batteries

Calculate your product’s projected autonomy with our online application VOLT

Calculating range with VOLT

NFC configuration: simple, fast and secure!

The Nexelec TOUCH app, combined with NFC technology, enables wireless adjustment by simply bringing a smartphone close to your sensor, making the process much simpler for users.

Over 25 configurable parameters :

  • Measurement and data transmission frequencies,
  • Light and sound indicators,
  • Choice of LoRaWAN radio frequency according to geographical area (EU868, US915, AS923, etc.)

There’s no need to unpack SIGN, as settings can be made through the packaging, without the sensor being powered by its battery!

CO2 sensor / Lorawan sensor / sonde CO2 connectée

Sustainable and eco-responsible

Nexelec is committed to responsible electronics. Our approach integrates respect for the environment right from the design stage. We choose sustainable materials, reduce energy consumption and aim to increase the longevity of our devices.

Read our environmental policy

Download the SIGN environmental datasheet

Measures ambient parameters with a single click

Need to take an immediate measurement and share the data? It’s now possible, and easy to do, thanks to the button on the front of the sensor.

CO2 sensor / Lorawan sensor / sonde CO2 connectée
CO2 sensor / Lorawan sensor / sonde CO2 connectée

Who says an IoT sensor can't be elegant?

SIGN combines technology with a modern, minimalist design that blends harmoniously into any environment.

Discover the future of the IoT, where functionality and aesthetics come together perfectly.

Design & Performance

Frequently Asked Questions

Our experts answer your questions

Correct ventilation of communal areas helps reduce the risk of viruses spreading through the air.
Measuring CO2 levels enables you to quickly check the quality of air renewal, and encourages occupants to air the room if necessary.

CO2 can cause headaches, drowsiness, difficulty concentrating, mild nausea and rapid heart rate.
NEXELEC’s CO2 sensors provide reliable and accurate measurement of CO2 concentration.

Depending on the model, products offer lighting and energy optimization, acoustic monitoring, space and safety management, and automation scenario options.

NDIR (Non-Dispersive Infrared) sensors offer highly accurate measurement of CO2 levels. They use infrared spectroscopy to specifically detect CO2 molecules, enabling reliable and consistent measurements.

NDIR sensors are designed to maintain their calibration and accuracy over long periods, making them a durable choice for continuous monitoring of CO2 levels.

NDIR sensors are effective and reliable in an environment where CO2 levels reach at least a minimum of 400 ppm for several consecutive hours: at night and at weekends in communal areas, during the day in a bedroom.

*Typical autonomy (not guaranteed) with 2 SAFT LS14500 batteries and 2 hours of LED per day: LoRaWAN SF10, Measurement 10 min, periodic sending 30 min

**Please refer to the information available on