Featuring an ultraviolet tube-type sensor and an electromechanical self-checking shutter mechanism, the Fireye Simplicity integrated flame scanner detects ultraviolet emissions from fossil fuel flames, such as those resulting from natural gas, coke oven gas, propane, methane, butane, kerosene, light petroleum distillates, and diesel fuels. The Fireye Simplicity 65UV5 also offers an internal flame relay with a fixed ON/OFF threshold, eliminating the need for an external flame amplifier.