UV1A3 FIREYE ULTRVIOLET SCANNER WITH 3FT FLEX

3'UV SCANNER,1/2"NPT FIREYE ULTRVIOLET SCANNER WITH 3FT FLEX - 1/2" NPT - Lead wire Length 3 FT - Operating temperature: -40 to 200° F. - Humidity 85% RH maximum non-condensing UV scanners are recommended for detecting flames from standard fuel gases, some waste gases and light oil fuels such as No. 2 oil. Flames from heavier oils can be detected with UV scanners but the unburned fuel shroud and/or atomization shroud can block passage of the UV from the flame zone to the UV tube, causing nuisance burner/boiler trips. Infrared detection is recommended for fuel oil heavier than No. 2, and some installations where waste gases are burned together with natural gas as a main flame. The UV tube is made of quartz and is filled with a gas that ionizes when struck by UV radiation from the flame. In the absence of UV radiation, the gas acts as an insulator between two electrodes which are mounted inside the tube. These electrodes are energized continuously by a high voltage. During combustion, UV radiation ionizes the gas, causing current pulses to flow between the electrodes. These current pulses result in a flame signal which is transmitted to the amplifier in the control, where it is processed to energize or hold in the flame relay UV1A3