Abstract: A system for analyzing a content of at least one element of a contained atmosphere for soldering or tinning with a metal alloy, comprising: at least one sampling line for taking a gas sample from the contained atmosphere; at least one analyzer for analyzing the element; at least one coalescence filter located on the sampling line upstream of the analyzer; wherein the sampling line comprises a portion, located between the contained atmosphere and the coalescence filter, wherein the formation of cold spots which could cause precipitation of solid or pasty compounds in the line portion is prevented; a detector of a blockage in the sampling line between the enclosure and the analyzer.

Abstract: The invention relates to a method and a plant for the central heating of a building provided with at least one thermodynamic machine such as a heat pump or a refrigerating machine. The method is characterized in that, without affecting the normal operation of the thermodynamic machine, during the heating period:when the temperature of the heat transfer fluid in the exchanger-accumulator tank reaches a certain threshold, the conduits via which the auxiliary boiler is connected to the circuit supplying the exchanger network are isolated and the return of this circuit to the tank is released while, on the other hand, when the temperature of the heat transfer fluid in the exchanger-accumulator tank drops below a certain threshold, the return to the exchanger-accumulator tank of the circuit supplying the exchangers is cut off and the auxiliary boiler whose discharge and return conduits are connected to the circuit is actuated.