Measure its consumption

Depending on the nature of the energy concerned, measuring consumption consists of:
  • electrical energy: to measure the intensity of the current consumed and to calculate the corresponding energy taking into account the voltage of the user network
  • Hydrocarbon energy: measuring a volume of gas or fuel oil

In the case of a heat pump installation, the return energy is calculated on the basis of the measurement of the temperature difference of the heat transfer fluid between the inlet and the outlet of the pump and the flow rate However, what is of interest to the consumer is in general the energy absorbed by the system, which is of an electrical nature.


There are mainly two technical solutions:
  • Electric power metering,
  • Disaggregation of signals.

Direct measurement

It is carried out mostly at the TGBT substations or at the output of the main circuit breaker for overall consumption, or at the level of departures from the divisional tables for sub-counts by use or by distribution sector.

The electrical currents are measured by means of current transformers, generally consisting of a toroid acting as a secondary winding of an electromagnetic transformer or a Hall effect sensor having a better accuracy. To simplify, we shall designate both of the types of measuring technology indifferently.

This sensor can be :
  • external : it is connected by a weak signal cable to the remote electronics module, responsible for signal conditioning and calculation of the corresponding measurements
  • internal : it is integrated into the electronic packaging module

In most cases, the packaging module is in the form of a box intended to be fixed on a DIN rail in the electrical panel (or in a nearby table). It is designed to handle 1 to 3 sensors depending on the model, thus enabling three-phase measurements.

There are products with more measurement channels, often presenting themselves in the form of independent boxes to be installed externally on the electrical panel, but the offer is constantly evolving and new products directly Integrable on DIN rail may appear.

In all cases the calculation of the energy consumed passes through measurement of the power absorbed, and also requires the measurement of the voltage of the instrumented phases. As a result, a large number of energy meters can also provide other parameters:

  • phase voltage
  • frequency
  • power factor (or cosine phi)
  • active power
  • reactive power
  • active energy
  • reactive energy

Whether external or internal, the sensors must be traversed by the cable in which the current to be measured is flowing.The internal sensor makes it necessary to modify the wiring of the instrumented circuit. This installation is also facilitated if the sensors are "clamp" or "opening" type, without requiring the temporary disconnection of the installed cable in order to have to pass it through a closed sensor. However, it is more difficult to realize precise opening sensors due to the problems caused by the disturbances of the magnetic circuit resulting from the physical interruption of the core at the level of the closure.

Regarding the availability of energy measurement, there are mainly two families:

  • the products generating pulses, by closing an external circuit at each count of an energy unit (usually the Wh)
  • products with digital interface

The first category requires a secondary device that will count the pulses and totalize them, and then make that index accessible to the user system, which is often included in the second category.

Devices in the second category transmit the measurements or make them accessible via a communication network to which the devices are connected, thus providing products supporting the various types of field network commonly used, such as Modbus, KNX, Bacnet, etc. The growing diffusion of IP communication outside IT systems alone also favors the introduction of Ethernet-capable products, simplifying deployment in the case of buildings with a network infrastructure. There are also products communicating by radio, and according to the same communication protocols as those mentioned above.

Indirect Measure

It consists in applying signal processing algorithms to a global signal (for example a group start) to extract the sub-signals that compose it on the basis of their own signatures These signatures are characteristic of classes Equipment, such as:

  • opendata_measure_resitive
  • engine,
  • Switching power supplies,
  • electro-luminescent lighting,
  • ...

This technique is called disaggregation and is the one used by the company Qualisteo, partner of the OpeNRJ project.

Volumetric counting

As mentioned above, this type of measurement is applied to energy sources based on fluids, such as gas, oil or other hydrocarbons. It uses meters delivering pulses per volume unit consumed, The same way as the communicating water meters deployed more and more frequently by the water distribution companies.

Focus on the solution Qualisteo

Non-intrusive counting

QUALISTEO has developed an innovative measuring solution, non-intrusive, which allows from a single point of measurement (the TGBT: General Table Low Voltage) to make a energy mapping from any site WITHOUT counters.

Schema recapitulatif
Algorithmic Decomposition of the Electric Signal

Vue compteur électrique
Electric meter view
Vue Qualisteo
Qualisteo view

Signal decomposition

The innovation lies in the decomposition of the electrical signal and in the precision of the calculation thanks to the algorithms developed by QUALISTEO.

QUALISTEO proposes a decomposition by zones (floors, workshops ...), appliances (motors, convectors, air conditioners ...) and uses (lighting, heating ...) allow to :

  • Understanding consumption
  • Establish the profile of your site
  • Identify potential savings
  • To act simply and quickly by simple settings
  • Monitor daily consumption and avoid drift

Fast return on investment

Make a big profit on your consumption from the 1st month.

Quality-price ratio: 10 times less expensive than counters

Data Integrity: not a simple electron count but an understanding and analysis by type of equipment (resistive, motor …)

Fiabilité : Accuracy of ± 1% on the measurement


  • Installed in <1 day;
  • Consumption view <1 week;
  • First analysis as of 1 week;
  • ROI <1 year
Vue compteur électrique
Up to 40% savings on your consumption