2G/4G LPWAN solutions for water network performance and monitoring

The SOFREL DL4W range consists in LS / LT, OpenSensor & NEO data loggers specifically designed for drinking water and wastewater networks. Watertight, operational for up to 10 years thanks to their high-capacity lithium battery, fitted with a modem and a high-performance 2G/4G antenna, the Data Loggers are compatible with all instruments used in water networks.

Very simple to set up and easy to use thanks to the LX SCADA, SOFREL PCWin2 and WEB LS software, the Data Loggers are also able to communicate with all commercially available SCADA systems and with the major third party water operator applications.

A robust and sustainable design capable to adapt to harsh environments

The constraints associated with water networks have been clearly defined:

  • Subterranean device installation
  • Risk of prolonged flooding
  • Weak reception of radio waves
  • Isolated and difficult-to-reach sites

In response to these constraints, LACROIX proposes a range of Data Loggers widely acknowledged for its robustness and reliability.

Thanks to their high-quality electronic and mechanical design, these devices are provided with a 3-year warranty.

SOFREL Data Loggers key strenghts

SOFREL data loggers have won prizes at international trade fairs and been widely adopted by water network operators all over the world.
Since the range was first launched, specific features and uses connected to water management have been introduced to enhance the SOFREL data logger offer. Currently, hundreds of thousands of devices deployed on isolated sites and subject to severe conditions in the field (humidity, absence of electricity, intermittent GSM reception, etc.) supply daily data used to monitor and react to water network performance levels.

Robust and innovative products in the IIoT (Industrial Internet of Things) market, SOFREL data loggers models provide numerous benefits.

Download SOFREL LS/LT brochures

Reinforced IP68 watertightness

Most often placed in manholes, the SOFREL data logger is frequently subjected to submersion phenomena. Thanks to its closure system and its military-style connector, it enjoys reinforced IP68 classification (certified 30 days under 4m), enabling it to function even when the manhole is flooded.

While strictly watertight, the user can open their data logger on site (no factory return required) to access the SIM card and battery,
With its ring and locking system, a simple “twist of the hand” is all it takes to close up your equipment and make it entirely watertight,

water proof IP68 data logger

The battery and energy management system offer up to 10 years of power...

Battery lithium powered

Depending on the model and its use, the high-capacity internal battery provides power for up to 10 years.

With its low energy consumption, the data logger can reduce maintenance costs for your fleet (fewer battery replacement operations).

Furthermore, it is possible to anticipate expiry of the battery by  analysing the remaining energy. As such, replacing the battery takes just a few minutes (no factory return required), without loss of use of the product.

The OpenSensor High Power model, in addition to its high capacity battery, has an EPS (External Power Supply) connection for powering the equipment from an external source (battery, mains, solar panel, microturbine…). This model is particularly suitable for the RS485 connection and the power supply of the most energy consuming sensors.

… with compatibility with 4G LPWAN networks for greater autonomy

The advantages of 4G LPWAN, NB-IoT and LTE-M communication are, firstly, to respond to the constraints of isolated and underground sites by ensuring the IP interoperability of equipment (plug & play).

In addition, the low latency and deep indoor nature of these telecommunication technologies make SOFREL DL4W or NEO data loggers ideal tools for monitoring networks in all circumstances.
They ensure the transmission and integrity of the data needed to analyse water systems and help operators make decisions in real time.
An LPWAN network optimised for Connected Objects (IoT) gives the SOFREL data loggers even greater autonomy.

Simplified start-up

The device is configured wirelessly via the PC’s Bluetooth connection. This makes it possible to intervene in complete safety close to the manhole.

The operator is guided by the SOFTOOLS configuration software. This software is characterised by its highly intuitive visual aspect. It takes just a few minutes to get your data logger up and running.

With the SOFREL WEB LS application, it will always be possible to remotely modify the configuration of your data logger.

Easy set up

Data transmission, our core competence

Data transmission IoT

Since its creation in 1971, LACROIX Sofrel has specialized in the field of teletransmissions and in particular wireless communication technologies. A company that is now at the forefront of the field and thanks to strong investments in R&D, LACROIX Sofrel has designed data loggers incorporating (not for NEO model) a very high-performance 2G/4G antenna:

  • Product design established around the antenna
  • Numerous laboratory tests
  • Antenna specifically designed to operate underground

In case of high signal attenuation in the manhole, the FLEX version allows you to use either the internal antenna or an external antenna. This version allows to adapt to all field situations and saves time during the implementation of the product.
Also during installation, the data logger offers functions to test the signal reception level in order to set up the data logger in an optimal way.

Our "Open" Modbus data loggers to interface with all RS485 sensors and flowmeters installed in water and wastewater networks.

  • Data logger DL4W-LP 4G

    Data logger SOFREL OpenSensor Low Power

    Serial communication and power supply for 8 Modbus-RTU sensors or flowmeters



  • Data logger DL4W-HP sensor 4G

    Data logger SOFREL OpenSensor High Power

    Serial communication and power supply for 8 Modbus-RTU sensors + level measurement via a US probe


Discover IoT data loggers for water distribution networks: district metering, pressure management, leak detection...

  • Data logger DL4W-LP 4G

    Data logger SOFREL LS-Flow: DL4W-LP model

    RS485 serial communication with AquaMaster (ABB), MAG8000 (SIEMENS), Octave (Arad) et WATERFLUX (KROHNE) flowmeters



  • Data logger DL4W-S 4G

    Data logger SOFREL LS42: DL4W-S model

    Single and double direction district meter consumption index monitoring


  • Data logger DL4W-S 4G

    Data logger SOFREL LS10: DL4W-S model

    Single district meter consumption index and “major customer” monitoring


  • Data logger DL4W-S 4G

    Data logger SOFREL LS-P: DL4W-S model

    Monitoring of 1 or 2 pressure sensors


  • Data logger IOT SOFREL LS-V

    Data logger SOFREL LS-V

    Pressure monitoring and control of a regulation valve
    2G/3G communication


  • Data logger IOT SOFREL NEO

    Data logger SOFREL NEO*

    Drinking water networks performance monitoring


    *Available in selected countries


Discover IoT data loggers for wastewater and rainwater networks: self-monitoring, permanent diagnosis, water quality monitoring...

  • Data logger DL4W-HP sensor 4G

    Data logger SOFREL LT-US: DL4W-HP model

    Equipped with an ultrasonic probe for height measurement and overflow detection



  • Data logger DL4W-S 4G

    Data logger SOFREL LT42: DL4W-S model

    Control of 1 or 2 sensors or radars for height and overflow detection


  • Data logger IOT SOFREL LT-US Atex

    Data logger SOFREL LT-US Atex

    Equipped with an ultrasonic probe for height measurement and overflow detection in an “explosive” area
    2G/3G communication


  • Data logger IOT SOFREL NEO

    Data logger SOFREL NEO*

    Wastewater and rain water collection networks monitoring


    *Available in selected countries

See the SOFREL DL4W application cases in video

The advantages of the product

Avantages IP68
Reinforced IP68 waterproofing certified 30 days under 4 m of water
Avantages battery life
Long-lasting lithium battery power supply: up to 10 years of autonomy
Avantages Flex
Integrated high performance antenna and possibility of using an external antenna
Avantages 2G-3G quality check
2G / 4G reception test
Avantages opening case
Access to SIM card and battery on site
Avantages 3 ans garantie
3-year manufacturer's warranty