Gas burner flame monitor - uses ionisation current circuit supplying oscillator providing dynamic monitoring signal

摘要

The flame monitor uses an ionisation current circuit providing a dynamic monitoring signal in response to the ionisation current. The oscillator (6) providing the dynamic monitoring signal is supplied with operating current via the ionisation current circuit. Pref. the oscillator signal frequency lies between 1 and 10 kHz, e.g. between 1.5 and 2.5 kHz the oscillation output being fed to a charge pumping circuit controlling a setting element (10) allowing the gas supply for the burner to be interrupted. ADVANTAGE - Min. circuit complexity.