Optical Velocity Measurement (OVM)
The Optical Velocity Measurement (OVM) sensor is designed to continuously measure velocity of hot flowing off-gases with accuracy and repeatability. It can be used for any kind of hot gases and is not dependent on CO2 presence and is suitable for a variety of industrial plants with temperatures above 600oC
The Tenova Goodfellow Velocity sensor (OVM) System is designed to operate as a stand-alone product that utilizes IR emission from the hot gases. The hot off-gas transmits radiation in various wavelengths and two particular band of wavelengths which are always present in the near IR region are selected. The velocity analyzer sends the measurements to the Plant PLC in the form of 4-20mA signals via the plant network through an Ethernet connection.
The essential component of the OVM includes two cabinets with photodiode sensors in each which are installed on the duct. One of the cabinets has a DAQ and processing card which accepts the signals from both the cabinets and performs the calculations for velocity and alarms. The second cabinet only hosts the PDA along with the sighting tube which collects the signal and is transmitted onto the first cabinet for velocity measurements.
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