Electronic Quick-Lockout

Burners with an electronic quick-lockout require power and are usually fitted to forced-air burners or safer atmospheric burners. They shut-down on flame failure in approximately 1 s by closing a solenoid valve fitted into the gas line. There are two main types of products: flame rectification and ultraviolet (UV). Flame rectification relies upon the ability of ionized gases in the flame to rectify on alternating current (AC) from the control unit. A flame-sensing rod made from special, high-temperature material is situated near the edge of the main flame. A micro-amp meter can be used in series with the rod to check the best position and minimize nuisance shutdowns. The wire must be sturdy enough to resist drooping or deterioration at high temperatures. The porcelain insulators must be kept clean or replaced if cracks develop. For reliable operation, the earthing-point on the burner must have at least four times the area of the rod in the flame.