Patent ID: 9134181
Filing Date: 2015-09-15
Classification: G01J,G08B

Abstract:
1. A flame sensing unit which comprises: an optical sensor for creating an event signal, wherein the event signal is indicative of a flame and is created whenever ultra-violet (UV) radiation is incident on the sensor and the incident UV radiation exceeds a predetermined fluence; an electro-magnetic sensor for creating a cancel signal in response to the reception of a Radio Frequency (RF) component transmitted in an electrical arc discharge; an antenna electrically connected to the electro-magnetic sensor for receiving the RF component of the electrical arc discharge, wherein the antenna has a predetermined length L, and the length L is established to receive RF components having an intensity above a predetermined threshold; a controller electronically connected to the electro-magnetic sensor for monitoring an operation of the electro-magnetic sensor for creation of the cancel signal; a computer connected to the optical sensor for receiving the event signal therefrom, and connected to the controller of the electro-magnetic sensor for receiving the cancel signal therefrom, and for stopping the event signal when the event signal and a cancel signal are received simultaneously by the computer; and an alarm connected to the computer for indicating the presence of a flame when the alarm receives an event signal.