Air conditioning loop in a ventilating, heating, and/or cooling apparatus for an automotive vehicle passenger compartment, comprising at least one component having an integrated instrumentation

The circuit includes a number of units including an evaporator (12), a gas cooling exchanger, a compressor, a heat exchanger, a detent valve, and a unit for channeling and circulation of heat exchange fluid for forming a heat exchange circuit. One of the units includes an elongated cavity (30), elongated w.r.t this unit and open towards its exterior, this cavity forming an integrated part of the unit and receiving a measuring sensor (40), for measuring a particular characteristic of the heating fluid, such as its pressure, the flow speed and its temperature.