Furnace, system, and method for calibrating flame current in furnace

A method for calibrating flame current in a furnace, the method comprising:

• initiating, by a controller, combustion within a combustion chamber by allowing flow of the fuel mixture to the combustion chamber, wherein the combustion chamber is configured in the furnace and adapted for burning a fuel mixture comprising fuel and air;
• receiving, by the controller, from a sensor communicably coupled to it, signals indicative of a flow rate of the air to the combustion chamber, wherein the sensor is configured in the furnace and is configured to generate signals indicative of a flow rate of the fuel mixture into the combustion chamber, and wherein for a fixed flow rate of the fuel, the generated signals are indicative of a flow rate of the air;
• receiving, by the controller, from a flame rod sensor communicably coupled to it, signals indicative of a flame current of the combustion chamber, wherein the flame rod sensor is configured in the combustion chamber, and is configured to generate signals indicative of a flame current in the combustion chamber;
• varying, by the controller, a flow rate of the air to the combustion chamber;
• receiving, by the controller, from the flame rod sensor, responsive to varying of the flow rate of the air to the combustion chamber, signals indicative of a change in the flame current of the combustion chamber;
• and
• determining, by the controller, based on varying of the flow rate of the air to the combustion chamber, and the change in the flame current of the combustion chamber, a correlation between the flow rate of the air to the combustion chamber, and the flame current of the combustion chamber.