An electronic device for detecting and monitoring electrical parameters associated with one or more physical quantities, said device being adapted to come into contact with fluids and/or gases and comprising: - at least one sensor suitable for monitoring one or more physical quantities and for generating electrical parameters associated with the latter; - one or more electronic processing units connected to said at least one sensor; - a hollow protection shell adapted to contain at least said one or more electronic processing units, said protection shell comprising two half shells (8, 9) suited to be mutually coupled with each other; - coupling means associated with said shell and suited to promote the mutual and removable coupling of said half shells (8, 9) and to promote the closing of said shell so that it is substantially gas and/or fluid tight; - monitoring means designed to generate a monitoring signal (s 45) which can vary according to the coupling condition of said half shells (8, 9), wherein said one or more electronic processing units is suited to process said monitoring signal (s 45) and generate an alarm signal (s A) when said shell is closed but not completely gas and/or fluid tight, characterized in that said monitoring signal (s 45) allows to detect: - the tight coupling of said half shells (8, 9), suitable for obtaining the complete insulation of the shell from the humidity and/or from the fluids which are outside the same; - the partial coupling of said half shells (8, 9), suitable for obtaining partial tightness with respect to the fluids and/or gases which are outside the shell, so that they are allowed to flow into said shell. - at least one sensor suitable for monitoring one or more physical quantities and for generating electrical parameters associated with the latter; - one or more electronic processing units connected to said at least one sensor; - a hollow protection shell adapted to contain at least said one or more electronic processing units, said protection shell comprising two half shells (8, 9) suited to be mutually coupled with each other; - coupling means associated with said shell and suited to promote the mutual and removable coupling of said half shells (8, 9) and to promote the closing of said shell so that it is substantially gas and/or fluid tight; - monitoring means designed to generate a monitoring signal (s 45) which can vary according to the coupling condition of said half shells (8, 9), wherein said one or more electronic processing units is suited to process said monitoring signal (s 45) and generate an alarm signal (s A) when said shell is closed but not completely gas and/or fluid tight, characterized in that said monitoring signal (s 45) allows to detect: - the tight coupling of said half shells (8, 9), suitable for obtaining the complete insulation of the shell from the humidity and/or from the fluids which are outside the same; - the partial coupling of said half shells (8, 9), suitable for obtaining partial tightness with respect to the fluids and/or gases which are outside the shell, so that they are allowed to flow into said shell. - the tight coupling of said half shells (8, 9), suitable for obtaining the complete insulation of the shell from the humidity and/or from the fluids which are outside the same; - the partial coupling of said half shells (8, 9), suitable for obtaining partial tightness with respect to the fluids and/or gases which are outside the shell, so that they are allowed to flow into said shell.