Project Description

Temperature (internal)

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

Material temperature

Range: -40°C to +125°C
Resolution : 0,015°C

Humidité relative

Range: 0 to 100%RH
Resolution : 0,02%RH

Wood moisture

by specific treatment


Indoor or outdoor
Historical monuments, buildings
Consult us for other materials

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


IoT, LoRa, LoRaWAN™
High capacity Li-ion cell
10,5cm x 10,5cm x 6cm
Operating temperature: -30°C to +85°C
1 to 4 measurements in the material per sensor



Autonomous sensor for continuous measurement of temperature and relative humidity in wood or other porous material.

Sensors data are transmitted in LoRa to A3IP Cloud, via a long distance encrypted radio transmission and consuming very little energy. They are stored and accessible through A3IP Cloud applications; access to the data of the connected sensors is simple and the visualization of the measurements is easy.

Wood moisture sensors are based on the equilibrium relationship between wood and air. A temperature and air humidity sensor is inserted into a small cavity created in the wood element. In this configuration, the wood moisture will impose the conditions (T, RH) inside the cavity. A hygroscopic equilibrium chart for wood is then applied to compute the measurements in the area surrounding the cavity, correlating it with the temperature and relative humidity of the air around the measurement point. The probe requires a small diameter drilling of the requested depth.

Sensors active element measuring relative humidity uses a field effect (capacitive) to achieve a reliable and accurate measurement for a wide range of use (in temperature as well as in moisture). It avoids degradation over time, or due to high levels of humidity in classic sensors (resistive, membrane, optical…).

Probe requires an 11mm diameter hole of the desired depth.

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

The sensor was developed in partnership with the University of Clermont Auvergne and the MSGC test platform of Polytech Clermont Ferrand (


Measurement of moisture content in porous materials, including wood.
A specific exploitation for a wood species or another material is possible; consult us.

Local measurement interval 1 second (via Bluetooth application)
Data reporting interval 10 minutes (configurable)
Reported data Probes temperature (1 to 4)
Probes relative humidity (1 to 4)
Temperature and relative humidity of the air around the case
Case temperature
Battery voltage
Measuring principle Digita
Measuring range -40 … +125°C
Resolution 0,015°C
Repeatability ±0,1°C
Long term drift < 0.05 °C/year
Humidity probe
Measuring principle Capacitive
Measuring range -0 … 100 %RH
Resolution 0,02 % RH
Repetability ±0,2 % RH
Long term drift < 0.5 % RH/year (+23 °C, 30 … 70 % RH)

Measuring principle NTC
Measuring range -55 … +125°C
Resolution 0,6°C (-5 … +50°C)
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 to40m
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

Operating temperature -30 … +85°C
Dimension 105 x 105 x 60 mm
Weight 280g
Internal memory 1024 measurements
Case Polycarbonate (weather, UV and impact resistant)
Decompressor against condensation
IP65, IK07
Fixing brackets

Order references
Order references
ABL-01 wood sensor with 1 probe, 20cm cable
ABL-01-xx wood sensor with 1 probe, specific length cable*
ABL-02 wood sensor with 2 probes, 20cm cable
ABL-02-xx wood sensor with 2 probes, specific length cable*
ABL-03 wood sensor with 3 probes, 20cm cable
ABL-03-xx wood sensor with 3 probes, specific length cable*
ABL-04 wood sensor with 4 probes, 20cm cable
ABL-04-xx wood sensor with 4 probes, specific length cable*

* cable length cannot exceed 5m per sensor

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