362A3342P002 Flame Sensor Cable

This document describes the Fireye Turbine Flame Sensor for turbine flame monitoring applications, its installation and setup. The Turbine Flame Sensor responds to Ultraviolet optical energy from the flame (200-400 nanometers) and has a loop powered 4-20mA output representing flame brightness from a very low level. It is not sensitive to visible and IR emissions from hot walls. The Fireye design basis is a total separation of the optical sensing device from the turbine without the need for expensive water or pressurized air cooling systems

At the hot end is a sapphire glass window to protect the lens and fiber optic bundle from extreme pressure and temperature. The fiber optic bundle transmits the UV light to the electronic assembly on the cool end, which amplifies the signal and converts it to a 4-20mA output. The sensor is a loop powered 4-20mA device. The sensor monitoring electronics needs to provide a voltage between 18 and 30 VDC and the sensor will vary the current between 4 and 20mA depending upon the turbine optical signal. Nominal voltage is 24 VDC. With no optical signal from the flame output will be 4mA as a minimum. Because of variation in fuel, sighting, turbine styles, etc. the output level for a FLAME ON is a site decision. Fireye recommends that at least 5 mA be used as a threshold level to detect FLAME ON. The cable has multiple conductors and uses white for +24 VDC and black for the return of the 4-20mA signal.

RS-FS-9001 362A1052P004