Flame monitor

A control system comprising:

• an ionization electrode;
• a first flame sensor;
• a first signal conditioning circuit in communication with the ionization electrode;
• a second signal conditioning circuit in communication with the first flame sensor;
• an output unit;
• and
• a processor in communication with the first signal conditioning circuit and with the second signal conditioning circuits and with the output unit;
• the processor configured to:
• receive a first ionization signal and a second ionization signal indicative of ionization currents via the first signal conditioning circuit from the ionization electrode, the second ionization signal received after the first ionization signal;
• receive a first flame signal and a second flame signal indicative of radiations originating from a flame via the second signal conditioning circuit from the first flame sensor, the second flame signal being received after the first flame signal;
• produce a derived ionization signal as a function of the first and the second ionization signals;
• produce a derived flame signal as a function of the first and the second flame signals;
• determine if a flame lift-off condition exists based on the derived ionization signal and based on the derived flame signal;
• and
• if a flame lift-off condition exists, produce a safety signal and transmit the safety signal to the output unit.