500-52AA04-101 is a Honeywell Flame Amplifier, which is used to detect an open flame in furnaces, ovens, and burners. The device features two flame signals, an adjustable sensitivity, and provides flame failure response in as little as 0.2 seconds. The unit can be used in place of a flame rectification system, or in conjunction with one, for added detection capabilities. The amplifier is housed in a flameproof enclosure, and is designed to meet global safety standards.