Flame ionization method for gas-fired equipment, involves measuring sum and difference between time periods required for positive charging and negative discharging of capacitor to measure degree of ionization of flame

摘要

The method involves supplying an electrical signal through a capacitor (102) on two electrodes in a flame produced by a burner, so that an ionization current passing through a diode (103) and ionization resistors (104, 105) is made alternatively positive and negative. A sum and a difference between a time period required for the positive charging of the capacitor and another time period required for the negative discharging of the capacitor are measured by using of a voltmeter (101) to measure a degree of ionization of the flame at positive and negative charges.