Conax

Fiber Optic Assemblies for

Industrial and Aircraft Applications
Fiber Optic Assemblies for Industrial and Aircraft Applications
Characteristics:
  • Input power: 115-230 VAC, 47-63 Hz
  • Available output signal: 4-20 mA, 0-5 Vdc, RS485, etc.
  • Sensing range: +350ºC to +1300ºC
  • System accuracy: ± 3% over the range of +350ºC to +700ºC±1% over the range of +700ºC to +1300ºC
  • System response time: <1 sec.
  • Environmental temperature: 0ºC to +50ºC (electro-optic unit and digital signal processor)
  • Probe vibration: 20g random vibration on mutually perpendicular axes
  • Probe Tip: Sapphire sensor protection is provided by a silicon carbide sheath housed in a superalloy well. Material selection and housing design have provided reliable performance at turbine inlet locations.
  • Probe shaft: The flexible design of the shaft accommodates the thermal expansion normally encountered during turbine operation between the hot gas path and the turbine housing.
  • Mounting configurations: are designed to fit virtually any turbine system interface. Sensor probe lengths can be varied to accommodate turbine frames.
  • Termination: The rugged termination head is designed for the power plant environment.
  • The optical path: is integrated with the electro-optical unit, forming a closed loop system.
  • Fiber Optic Cable: Double-linked superflex stainless steel armor cable for optical cable protection.
  • The electro-optic unit (EOU): Separates the optical signal into two separate wavelength bands,amplifies the signals and converts to digital values.The EOU is permanently attached to each probe and stores information specific to that probe’s operation. This calibration information is downloaded to the signal processor when a new probe is installed, limiting reprogramming.
  • Digital Signal Processor: Digital signals from the electro-optic unit are transferred to the Digital Signal Processor via an RS-485 interface.The output signal is based on the signal levels and calibration information the digital signal processor receives from the electro-optic unit.The digital signal processor module can be configured for a variety of output signal schemes.
Product Description:
Conax Buffalo Technologies’ Fiber Optic Temperature System revolutionizes temperature measurement in gas turbine engines.Conax’s new optical sensor system operates directly in the turbine inlet, withstanding temperatures and gas flow rates far beyond the capability of conventional sensor technology. This provides considerable improvement over traditional thermocouple technology that measures exhaust gas temperature.Efficiency and power output improvements in gas turbine systems have produced increases in turbine inlet temperatures to well over 1000oC for base load operation. At such elevated temperatures and in gas flow velocities, Conax’s patented technology has been proven superior for the measurement of turbine inlet and inter-turbine temperatures. As power generation facilities seek more efficient methods of operation, Conax fiber optic systems play a key role in the control solution for advanced gas turbine. Sensing Element and Probe Housing The Conax Buffalo Technologies Fiber Optic Temperature sensor technology is based on thermal radiation. An optically emissive material is inserted into the flow path where it is heated by the gas stream and produces thermal radiation. This optical energy is transmitted down a sapphire light guide which is supported in a probe housing. Fiber Optic Cable A flexible optical fiber within the cable transmits the thermal radiation from the probe to the signal processor. The rugged construction is derived from cable assemblies designed for the harsh military aircraft engine environment, allowing the cable to survive the temperature and vibration associated with the turbine engine case environment. Opto-Electronic Signal Processor Optical radiation produced by the probe is detected by the signal processor and converted to a digital value corresponding to the probe tip temperature.
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