System for controlling a facility under pressure, other than a nuclear facility, especially a boiler facility adapted for use without permanent human presence, characterised in that it comprises at least: - two independent measuring chains (21, 22), of which: - a first measuring chain is adapted to equip a first part (11, 14) of the facility and to measure parameters (N1, P1; Q1, P1) which are characteristic of the functioning of this first part (11, 14), and - a second measuring chain is adapted to equip a second part (12, 15) of the facility and to measure parameters (N2, P2; Q2, P2) which are characteristic of the functioning of this second part (12, 15), - two programmable logic controllers (31, 32), of which a first logic controller is connected to the first measuring chain and a second logic controller is connected to the second measuring chain, the two logic controllers (31, 32) in communication comparing the characteristic parameters (N1, P1; Q1, P1) of the first part (11, 14) and the characteristic parameters (N2, P2; Q2, P2) of the second part (12, 15) in order to detect abnormal functioning of the facility or of the measuring chains (21, 22), so as to transmit a safety warning with a view to a maintenance operation and/or to activate protection means with which the facility is equipped; and - a terminal for controlling the control system, which terminal is in communication with at least one of the two logic controllers (31, 32) and receives the safety warning if abnormal functioning of the facility is detected, in that each measuring chain (21; 22) comprises a fluid level (N1; N2) sensor (41; 42) and a pressure (P1; P2) sensor (51; 52) which are arranged in the part (11, 14; 12, 15) of the facility that is equipped with that measuring chain (21; 22), detection of an abnormal fluid level (N1; N2) causing the fluid level in the part (11, 14; 12, 15) of the facility in question to be restored, detection of an abnormal pressure (P1; P2) causing a safety lock in the facility, and in that each measuring chain (21; 22) comprises a fluid flow rate (Q1; Q2) sensor and a pressure (P1; P2) sensor (51; 52) which are arranged in the part (11, 14; 12, 15) of the facility that is equipped with that measuring chain (21; 22), detection of an abnormal fluid flow rate (Q1; Q2) and/or of an abnormal pressure (P1; P2) causing a safety lock in the facility. - two independent measuring chains (21, 22), of which: - a first measuring chain is adapted to equip a first part (11, 14) of the facility and to measure parameters (N1, P1; Q1, P1) which are characteristic of the functioning of this first part (11, 14), and - a second measuring chain is adapted to equip a second part (12, 15) of the facility and to measure parameters (N2, P2; Q2, P2) which are characteristic of the functioning of this second part (12, 15), - a first measuring chain is adapted to equip a first part (11, 14) of the facility and to measure parameters (N1, P1; Q1, P1) which are characteristic of the functioning of this first part (11, 14), and - a second measuring chain is adapted to equip a second part (12, 15) of the facility and to measure parameters (N2, P2; Q2, P2) which are characteristic of the functioning of this second part (12, 15), - two programmable logic controllers (31, 32), of which a first logic controller is connected to the first measuring chain and a second logic controller is connected to the second measuring chain, the two logic controllers (31, 32) in communication comparing the characteristic parameters (N1, P1; Q1, P1) of the first part (11, 14) and the characteristic parameters (N2, P2; Q2, P2) of the second part (12, 15) in order to detect abnormal functioning of the facility or of the measuring chains (21, 22), so as to transmit a safety warning with a view to a maintenance operation and/or to activate protection means with which the facility is equipped; and - a terminal for controlling the control system, which terminal is in communication with at least one of the two logic controllers (31, 32) and receives the safety warning if abnormal functioning of the facility is detected,