Pressure regulator, comprising: - an inlet passage connectable to an inlet conduit of a fluid at an inlet pressure (Pin); - an outlet passage; - a supply valve placed in a valve seat between the inlet passage and the outlet passage and provided with adjustment means suitable to regulate the outlet pressure (Pout) of the fluid in the outlet passage so that it is proportional to the inlet pressure (Pin); - an outlet pressure sensor, suitable to detect the outlet pressure (Pout); - a loading electromagnetic valve having an inlet in fluid communication with the inlet passage and an outlet in fluid communication with the supply valve - an unloading electromagnetic valve having an inlet in fluid communication with the supply valve and an unloading outlet; - a regulator control circuit operatively connected to the loading electromagnetic valve and to the unloading electromagnetic valve and configured to pilot the loading electromagnetic valve and the unloading electromagnetic valve so as to cancel an error signal given by the difference between an inlet signal corresponding to the desired outlet pressure and a feedback signal provided by the outlet pressure sensor, the pressure regulator being characterized in that it further comprises an engaging current analysis circuit configured to: a) detect and store reference characteristics of the waveform of the engaging current of the solenoid of the loading electromagnetic valve in a stable inlet pressure condition; b) monitor, during the operation of the regulator, the waveform of said engaging current of the solenoid of the loading electromagnetic valve so as to detect any variations of its characteristics with respect to the corresponding reference characteristics; c) in the event of variation, provide a pilot modulation signal to the loading electromagnetic valve and/or the unloading electromagnetic valve and/or a pressure variation signal to the control circuit. - an inlet passage connectable to an inlet conduit of a fluid at an inlet pressure (Pin); - an outlet passage; - a supply valve placed in a valve seat between the inlet passage and the outlet passage and provided with adjustment means suitable to regulate the outlet pressure (Pout) of the fluid in the outlet passage so that it is proportional to the inlet pressure (Pin); - an outlet pressure sensor, suitable to detect the outlet pressure (Pout); - a loading electromagnetic valve having an inlet in fluid communication with the inlet passage and an outlet in fluid communication with the supply valve - an unloading electromagnetic valve having an inlet in fluid communication with the supply valve and an unloading outlet; - a regulator control circuit operatively connected to the loading electromagnetic valve and to the unloading electromagnetic valve and configured to pilot the loading electromagnetic valve and the unloading electromagnetic valve so as to cancel an error signal given by the difference between an inlet signal corresponding to the desired outlet pressure and a feedback signal provided by the outlet pressure sensor, the pressure regulator being characterized in that it further comprises an engaging current analysis circuit configured to: a) detect and store reference characteristics of the waveform of the engaging current of the solenoid of the loading electromagnetic valve in a stable inlet pressure condition; b) monitor, during the operation of the regulator, the waveform of said engaging current of the solenoid of the loading electromagnetic valve so as to detect any variations of its characteristics with respect to the corresponding reference characteristics; c) in the event of variation, provide a pilot modulation signal to the loading electromagnetic valve and/or the unloading electromagnetic valve and/or a pressure variation signal to the control circuit. a) detect and store reference characteristics of the waveform of the engaging current of the solenoid of the loading electromagnetic valve in a stable inlet pressure condition; b) monitor, during the operation of the regulator, the waveform of said engaging current of the solenoid of the loading electromagnetic valve so as to detect any variations of its characteristics with respect to the corresponding reference characteristics; c) in the event of variation, provide a pilot modulation signal to the loading electromagnetic valve and/or the unloading electromagnetic valve and/or a pressure variation signal to the control circuit.