The DNI measures, learns, calculates and alerts in the event of a leak


For which type of tanks?

The DNI is suitable for all types of tanks. Whether vertical, horizontal or even
inclined tanks, the DNI is able to calculate the levels and volumes of refrigerant.

Single vertical tanks

Horizontal tanks on outdoor bodied units

Double vertical tanks

Single and inclined horizontal tanks

For which refrigerants?

The DNI works with all refrigerants. More than 120 fluids are integrated into the DNI library, including CO2 and ammonia (NH3). It is even possible to create your own mixtures.


How does the DNI communicate?

The DNI is connected to the PolarVisor web interface. Several connection options are available: wifi, ethernet / RJ45 cable or via a 3G / 4G card. The connection to PolarVisor brings many advantages such as assistance with fault identification, automatic updates, an additional year of warranty and an easier after-sales service. Note: the exchange of information between the DNI and Sentinelle is secure thanks to data encryption.

How do leak alerts work?


Connected to the PolarVisore web app, the PolarBox alerts by email in case of a leak and indicates the type of leak, estimates its flow rate, the leak rate of the installation and its current load.

Alarm relay

The alarm relay or dry contact makes it possible to alert locally about the presence of a leak. This type of alarm can be connected to a Centralized Technical Management solution.

Need advice, questions ?

More information


Matelex supports you in the installation of your DNI and its additional modules with a detailed and pictorial installation manual. Our technical support is available by phone or email and offers distance and / or on-site training sessions.


The DNI complies with French and European regulatory requirements. Patented and tested by independent organizations, the DNI triggers an alarm as soon as a leak is declared and before reaching regulatory thresholds (50g / h or 10% of the volume of the equipment).

Our open training courses

Would you like to learn more about the DNI and its modules, train yourself in their installation or in the use of PolarVisor?
We organise practical training courses adapted to your needs.