Constant current flame ionization circuit

US6509838B1 · kind B1 · utility

Inventors

• Peter P. Payne · Wheeling, US
• Stephan E. Schmidt · Essen, DE
• Kristin Powers Goppel · Shrewsbury, US
• Darrell J. King · Belmont, US
• Stephen M. Tobin · Watertown, US
• J. Thomas Fowler · Marblehead, US

Key dates

• Filing date: May 12, 2000
• Grant date: Jan 21, 2003
• Expiry date: May 12, 2020

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F23D14/725
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

In a flame ionization sensor type gas combustion control apparatus, the sensor is provided with a power supply which will increase the voltage as contamination build up occurs on the in-flame sensor electrode thereby keeping a constant sensor current and enabling the sensor to perform as intended even though insulative contaminant build up is present on the electrode.