Combustion safety apparatus

A combustion safety apparatus of the type having a main burner in front thereof, with a combustion detecting element such as an oxygen concentration cell element or the like, the element having a first and second electrode, the first electrode thereof is always heated by a flame of a standing burner and is brought into lack of oxygen condition while the second electrode thereof is heated by the main burner, so that when the main burner is in its complete combustion condition, a difference in oxygen concentration between the two electrodes is formed to generate an output at the element;

• the main burner in its incomplete combustion condition has a decrease in oxygen concentration difference between the two electrodes and thereby the output at the element is lowered, and a safety device such as a gas safety valve or the like, arranged to be controlled in operation by the output of the element whereby:
• the element is formed into a long plate having a longitudinal axis, said plate being positioned such that said axis is disposed to extend nearly at a right angle to a center axis of the flame of the standing burner, said center axis being the longitudinal axis of the flame.