Flame atmosphere analyzer and a water-heating device including the analyzer

A water-heating device comprising:

• a flame atmosphere analyzer including:
• (a) a tube defining an air-gas intake and mixing chamber,
• (b) a gas-supply nozzle opening into the air-gas intake and mixing chamber,
• (c) a flame burner comprising at least one flame jet which is in flow communication with the air-gas intake and mixing chamber in order to supply an air-gas mixture formed in the air-gas intake and mixing chamber to the burner, and
• (d) a primary combustion air-supply means comprising at least one duct which has a first end in flow communication with the air-gas intake and mixing chamber and which is open at the opposite, second end in order to take in the primary combustion air in a position remote and at a predetermined distance from the air-gas intake and mixing chamber in the tube;
• a combustion chamber;
• a main burner disposed in the combustion chamber and piloted by the analyzer;
• and
• means for admitting air to the combustion chamber, including partition means for the air admitted to the combustion chamber, the duct extending into the combustion chamber from the tube of the analyzer so as to take in the primary combustion air in the vicinity of the main burner.

A flame atmosphere analyzer comprising:

• a tube defining an air-gas intake and mixing chamber;
• a gas-supply nozzle opening into the air-gas intake and mixing chamber;
• a flame burner comprising a first flame jet which is in flow communication with the air-gas intake and mixing chamber in order to supply an air-gas mixture formed in the air-gas intake and mixing chamber to the burner and a second flame jet, the two flame jets diverging from one another and the side walls of which are substantially closed to the exterior except for an optional connecting duct between the flame jets for the lighting of one by the other;
• a primary combustion air-supply means comprising at least one tubular duct which has a first end in flow communication with the air-gas intake and mixing chamber and which is open at the opposite, second end in order to take in the primary combustion air in a position remote and at a predetermined distance from the air-gas intake and mixing chamber in the tube;
• and
• a thermocouple flame sensor connected to a circuit for controlling the supply of gas to the gas-supply nozzle in order to interrupt the gas-flow to the gas-supply nozzle when the level of oxygen in the primary combustion air taken from the duct falls below a predetermined value bringing about detachment of the flame from the burner and consequent intervention of the thermocouple flame sensor, the thermocouple flame sensor being positioned relative to the jets in a manner such as to be struck by the flame of only one of them.