An appliance includes a first gas-burning heating element, a first gas path extending from an inlet to the first heating element, and a first solenoid valve positioned within the first gas path. The appliance further includes a second gas path extending from upstream of the first solenoid valve to the first heating element and supplying a base gas flow to the first heating element. A controller is electronically coupled with the first solenoid valve for controlling a supplemental flow of gas through the first gas path to the first heating element such that the supplemental gas flow combines with the base gas flow to achieve a total gas flow. The controller controls the supplemental flow to adjust the total gas flow by pulsing the first solenoid valve at a first rate corresponding to a desired rate of the total gas flow to the first heating element.

A method for a combustion system includes outputting fuel from an adjustable-position fuel nozzle onto a perforated flame holder, the fuel being directed for mixture with an oxidant en route to the perforated flame holder. A combustion reaction of the fuel and the oxidant is supported within the perforated flame holder. A position of the adjustable-position fuel nozzle may be changed relative to the flame holder. A first flow of fuel may be output when the adjustable position fuel nozzle is in an extended state, and a second flow of fuel may be output when the adjustable-position fuel nozzle is in a retracted state.

A regulation device for regulating a mixing ratio (x) of a gas mixture comprises a first conduit (1) for carrying a flow of a first gas (e.g., air) and a second conduit (2) for carrying a flow of a second gas (e.g., a fuel gas). The first and second conduits (1, 2) open out into a common conduit (3) in a mixing region (M) to form the gas mixture. A first sensor (S1) is configured to determine at least one thermal parameter of the gas mixture downstream from the mixing region. A control device (10) is configured to receive, from the first sensor, sensor signals indicative of the at least one thermal parameter of the gas mixture and to derive control signals for adjusting device (V1) acting to adjust the mixing ratio, based on the at least one thermal parameter.

A high temperature carbon monoxide sensor for in-situ combustion monitoring is provided having a yttrium-stabilized zirconia interface based emf-measuring electrochemical sensor and a nickel oxide (NiO) first sensing electrode for targeting carbon monoxide gas at a temperature range from between about 1000 degrees Centigrade to about 1200 degrees Centigrade. A method of measuring carbon monoxide using this sensor is provided.

An apparatus may comprise a first carrier tube having a first input end and a first output end and a second carrier tube disposed substantially parallel to the first carrier tube and having a second input end and a second output end. A cross tube may be coupled to the first carrier tube and the second carrier tube and may be disposed substantially perpendicularly between the carrier tubes. A plurality of burner holes may be disposed along the first carrier tube, the second carrier tube, and the cross tube. A plurality of flame sensors may be disposed at various locations of the first carrier tube and the second carrier tube. A first igniter assembly may further be coupled to the first carrier tube.

A cooktop appliance includes a first burner and a second burner which are spaced apart with a grate positioned above the burners. The grate includes a first sensor finger with a first temperature sensor over the first burner and a second sensor finger with a second temperature sensor over the second burner. The cooktop appliance also includes a first control valve and a second control valve which selectively direct fuel to the respective burners. A controller of the cooktop appliance is operably coupled to the temperature sensors and the control valves. The controller may be operable for and/or methods of operating the cooktop appliance may include receiving a set temperature, receiving a first temperature measurement from the first temperature sensor and a second temperature measurement from the second temperature sensor, and adjusting each control valve based on the set temperature and the corresponding temperature measurement.

A flame sensing system, a flame sensing unit, and a method for sensing a flame are described. The flame sensing system includes a flame sense probe and a power regulating device. The power regulating device is configured to generate a regulated voltage from an input voltage received from a power source and to output the regulated voltage to the flame sense probe such that a flame current along a flame can be measured. The flame sensing system also includes a flame current detector to measure the flame current and generate an output voltage corresponding to the flame current, and a first level detector to generate a flame strength output signal based on the output voltage, where the flame strength output signal is indicative of a strength of a flame.

A safety system for a gas apparatus (100) for heating water, the gas apparatus comprising a tank (1) for containing water and a first gas burner (2) for heating the water contained inside the tank (1). The safety system (200, 200′) comprises a first sensor (9) suitable for generating a first signal which represents a temperature of the water contained in the tank (1), a second sensor (10) suitable for generating a second signal which represents a temperature of the water contained in the tank (1), a supply circuit (11) for energizing a first actuator (4) of a first valve (3) which is arranged to allow to pass/intercept a flow of gas towards the first gas burner (2), the first actuator (4) being arranged to actuate so as to open and close the first valve (3) when it is energized and non-energized, respectively, a switch device (13) which is arranged in the supply circuit (11) in order to close/open the supply circuit (11) so as to energize/not to energize the first actuator (4), a digital processing unit (14) which is operatively connected to the first and/or second sensor (9, 10) and which is configured to compare a set-point value which represents a preselected temperature with the first or second signal and a control device (16) which is operatively connected to the switch device (13) and to the first and second sensors (9, 10). The control device (16) comprises an analogue comparator (17) which is operatively connected to the first and second sensors (9, 10) in order to compare the first signal with the second signal and the control device (16) is configured to generate a control signal (18) for controlling so as to open/close the switch device (13) on the basis of the comparison between the first and second signals carried out by the analogue comparator (17).

A cooktop appliance includes a first burner and a second burner which are spaced apart with a grate positioned above the burners. The grate includes a first sensor finger with a first temperature sensor over the first burner and a second sensor finger with a second temperature sensor over the second burner. The cooktop appliance also includes a first control valve and a second control valve which selectively direct fuel to the respective burners. A controller of the cooktop appliance is operably coupled to the temperature sensors and the control valves. The controller may be operable for and/or methods of operating the cooktop appliance may include receiving a set temperature, receiving a first temperature measurement from the first temperature sensor and a second temperature measurement from the second temperature sensor, and adjusting each control valve based on the set temperature and the corresponding temperature measurement.

A method for a combustion system includes outputting fuel from an adjustable-position fuel nozzle onto a perforated flame holder, the fuel being directed for mixture with an oxidant en route to the perforated flame holder. A combustion reaction of the fuel and the oxidant is supported within the perforated flame holder. A position of the adjustable-position fuel nozzle may be changed relative to the flame holder. A first flow of fuel may be output when the adjustable position fuel nozzle is in an extended state, and a second flow of fuel may be output when the adjustable-position fuel nozzle is in a retracted state.