Inventors:
James M. Niziolek - Enfield CT
William M. Clark - Windsor CT
James M. Bialobrzeski - Suffield CT
Terry M. Grayson - Granby CT
Assignee:
ABB Inc. - Norwalk CT
ABB Automation Inc. - Wickliffe OH
International Classification:
G08B 1712
US Classification:
340579, 340577, 340578, 431 12, 431 75, 431 76
Abstract:
An ionic flame monitor. The flame monitor has a flame rod that produces an ionization current when the flame rod is immersed in a flame and excited by a voltage. The ionization current has a DC component and an AC component each dependent on the intensity of the flame, and a flicker frequency. The flame monitor also has a computing device that is responsive to signals representative of the flicker frequency, and the AC and DC components of the ionization current for determining the existence of the flame.