Project Description


Measuring range: 25mm
Resolution: <±5μm

Temperature (internal or remote)

Range: -25°C to +70°C
Resolution: 0,6°C


Indoor or outdoor, even in harsh environments
Cracks monitoring (1 to 3 axes) for buildings, monuments, bridges, dams, engineering structures…
Monitoring of joints on structures

Each sensor is autonomous; it doesn’t need another box nor a sending station


IoT, LoRa, LoRaWAN™
High capacity Li-ion cell
13,5cm x 13,5cm x 6cm
Operating temperature: -25°C to +85°C
1 to 3 probes per sensor



Autonomous sensor with probes; they are linear potentiometers measuring extremely small displacements.

They measure the cracks evolution or the contraction or joints extension.
Combined, several sensors can be used to monitor cracks in 3D.
This sensor is very robust and works in harsh environments.

Each sensor is autonomous; it does not need another box or a sending station


Monitoring in buildings, bridges, pipelines, dams.

Sensor characteristics
Data recording
Local measurement interval  1 second (via Bluetooth application)
Data reporting interval 30 minutes (configurable)
Reported data Probe distance (1 to 3)
Case temperature
Battery voltage
Motion probe
Measurement principle LVDT
Measuring range 0 … 25mm
Resolution < ±5µm
Repeatability < 10µm
Linearity ±0,2%
Temperature sensor inside the housing
Measuring principle NTC
Measuring range -55 … +125°C
Resolution 0,6°C (-5 … +50°C)

Long distance radio
Radio technology LoRaWAN
Security AES-128 data encryption
Supported features LoRa private or operated, OTAA
Radio range Up to 15 km
Transmitted power Up to 20 dBm (adaptive)
Receiver sensitivity -142 dBm
Frequency band 868 MHz (EU), 915MHz (US, AS, AU)
Antenna Internal or external to the housing
Local radio
Radio technology Bluetooth Low Energy
Radio range Up to 40m
Transmitted power Up to 4 dBm
Receiver sensitivity -96 dBm
Frequency band 2.4 GHz ISM
Antenna Internal to the box

Power supply
Battery type Lithium-Ion
Power consumption < 1mW
Battery life *
Measurement period Duration (up to)
10 minutes 5 years
20 minutes 10 years
30 minutes 15 years
1 hour 15 years

* Indicative duration, for use in the conditions of use and depending on the number of connected sensors and their characteristics

Operating temperature -25 … +85°C
Dimension 135 x 135 x 60 mm
Weight 350g
Internal memory 1024 measurements
Case Polycarbonate (weather, UV and impact resistant)
Decompressor against condensation
IP65, IK07
Fixing brackets

Order references
Order references
ADLv-01-25 fissurometer with 1 LVDT sensor (stroke 25mm, cable length 1m)
ADLv-02-25  fissurometer with 2 LVDT sensors (stroke 25mm, cable length 1m)
ADLv-03-25  fissurometer with 3 LVDT sensors (stroke 25mm, cable length 1m)

Other options: contact us


Specifications and information in this document are subject to change without notice.

A3IP products are not warranted or licensed for use as a critical component for medical or other life-saving or life-sustaining applications, or other applications where failure could reasonably be expected to cause serious injury, death, or damage to any structure, work or building.

In addition, devices are indications and decision aids and cannot be used in alarm or critical applications.


+33 (0)2 40 94 78 41

Bâtiment Placel
Route de Vannes