A barbecue arrangement comprising a barbecue body having a cooking volume, one or more burners positioned to provide heat to the cooking volume; a gas source adapted to supply a gas to the one or more burners, and one or more control means to control the flow of gas from the gas source to the one or more burners producing a flame when the gas is ignited; a flame detection assembly, the flame detection assembly adapted to sense the flame from the one or more burners and a control means adapted to shut off the gas flow to the one or more burners if the flame is not detected within a pre-determined period of time.

The invention relates to a water heating device, comprising a burner (20) and a flame current measuring device (100) for measuring a flame current, which measuring device comprises two electrodes and a voltage source (14), wherein each of the poles (18, 19) of the voltage source is connected to one of the electrodes. The water heating device further comprises a heat exchanger (40) which is electrically insulated relative to the burner. The burner and the heat exchanger here form the electrodes of the flame current measuring device. The heat exchanger functioning as electrode can be earthed (41). The measured flame current can be used to determine the excess air factor of the combustion. The water heating device can further comprise an air/fuel controller for controlling the air/fuel ratio, wherein the air/fuel controller uses the determined excess air factor to control the air/fuel ratio. The invention also relates to a method for measuring a flame current in a flame.

A fuel-fired device can include an air-moving device that mixes air and a fuel to generate a fuel-air mixture. The fuel-fired device can also include an air box that provides the air to the air-moving device, and a fuel valve that provides the fuel to the air-moving device, where the fuel valve includes a tracking port coupled to the air box, where the tracking port detects a pressure of the air box. The fuel-fired device can further provide a pressure-regulating device disposed between a pressurized component and the tracking port of the fuel valve. The flow regulating device can control, during an ignition phase of operation, an amount of the fuel provided by the fuel valve to the air-moving device.

A control device of a hydrogen gas burner device sets a target flow rate of a hydrogen gas such that a flow rate of the hydrogen gas decreases as a temperature of the hydrogen gas becomes higher, based on the temperature of the hydrogen gas and a needed quantity of heat of the hydrogen gas during the combustion, sets a target flow speed such that the flow speed of the hydrogen gas released from a combustion nozzle via a flow speed regulator becomes a flow speed based on the target flow rate and the flow speed of the hydrogen gas increases as a value of the target flow rate decreases, controls the flow rate regulator such that the flow rate of the hydrogen gas reaches the target flow rate, and controls the flow speed regulator such that the flow speed of the hydrogen gas reaches the target flow speed.

A flame rod analysis system, methods for determining a condition of a flame and a flame rod, and circuits for determining a condition of a flame and a flame rod. The flame rod analysis system comprises energy storage connectable to a flame rod, a pulsed source connected to the energy storage and providing a voltage pulse or a current pulse, and a buffer to allow a processor to measure a buffered voltage at various time points. Flame rod analysis systems can distinguish between various flame conditions (no flame, low flame, etc.) while simultaneously characterizing the condition of the flame rod (shorted to ground, contaminated, etc.). Some flame rod analysis systems can directly measure the resistance of the flame rod.

A method of operating a cooktop appliance in a precision mode includes monitoring a temperature with a temperature sensor and starting a vaporization timer when the monitored temperature enters a vaporization band. The method also includes freezing the precision mode when the vaporization timer expires and the monitored temperature is within the vaporization band.

A method of operating a cooktop appliance in a precision mode includes monitoring a temperature with a temperature sensor and starting a vaporization timer when the monitored temperature enters a vaporization band. The method also includes freezing the precision mode when the vaporization timer expires and the monitored temperature is within the vaporization band.

A fuel-fired device can include an air-moving device that mixes air and a fuel to generate a fuel-air mixture. The fuel-fired device can also include an air box that provides the air to the air-moving device, and a fuel valve that provides the fuel to the air-moving device, where the fuel valve includes a tracking port coupled to the air box, where the tracking port detects a pressure of the air box. The fuel-fired device can further provide a pressure-regulating device disposed between a pressurized component and the tracking port of the fuel valve. The flow regulating device can control, during an ignition phase of operation, an amount of the fuel provided by the fuel valve to the air-moving device.

A flame rod analysis system, methods for determining a condition of a flame and a flame rod, and circuits for determining a condition of a flame and a flame rod. The flame rod analysis system comprises energy storage connectable to a flame rod, a pulsed source connected to the energy storage and providing a voltage pulse or a current pulse, and a buffer to allow a processor to measure a buffered voltage at various time points. Flame rod analysis systems can distinguish between various flame conditions (no flame, low flame, etc.) while simultaneously characterizing the condition of the flame rod (shorted to ground, contaminated, etc.). Some flame rod analysis systems can directly measure the resistance of the flame rod.

A control device of a hydrogen gas burner device sets a target flow rate of a hydrogen gas such that a flow rate of the hydrogen gas decreases as a temperature of the hydrogen gas becomes higher, based on the temperature of the hydrogen gas and a needed quantity of heat of the hydrogen gas during the combustion, sets a target flow speed such that the flow speed of the hydrogen gas released from a combustion nozzle via a flow speed regulator becomes a flow speed based on the target flow rate and the flow speed of the hydrogen gas increases as a value of the target flow rate decreases, controls the flow rate regulator such that the flow rate of the hydrogen gas reaches the target flow rate, and controls the flow speed regulator such that the flow speed of the hydrogen gas reaches the target flow speed.