330505 Low Frequency Velocity Sensor - GE Energy Bently Nevada - #1

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Specifications and Ordering Information Part Number 169872-01 Rev. A (04/07) Page 1 of 11 330505 Low Frequency Velocity Sensor Description The Bently Nevada Low Frequency Velocity Sensor is designed to measure absolute (relative to free space) bearing housing, casing, or structural vibration. The two-wire system consists of a transducer and appropriate cable. The Low Frequency Velocity Sensor is ideal for capturing vibration data in installations where vibration frequencies of less than 4 Hz provide valuable data. Its main use is to measure bearing casing vibrations on hydroelectric turbines where slow rotating speeds require a low signal to noise ratio. The 330505 Transducer is a two-wire design that uses moving-coil technology with embedded signal conditioning circuitry to provide a voltage output directly proportional to the transducer's vibration velocity. The 330505 Transducer connects to an interconnect cable and is then directly attached into the 3500/46M Hydro Monitor. This transducer currently does NOT interface with the Trendmaster® family of products. Additionally, due to capacitance constraints, hazardous area approvals will NOT be available on this product. Caution Due to the nature of high amplitude, low frequency velocity events, the 330505 Low Frequency Velocity Sensor cannot be used for automated machinery protection. It is designed to provide early warning of pending machinery problems and to assist in diagnosing machinery problems. In addition, care should be exercised in the physical installation of the transducer. Improper installation can result in a degradation of the transducer’s performance, and/or the generation of signals which do not represent actual machine vibration. Upon request, we can provide engineering services to determine the appropriateness of housing measurements for the machine in question and/or to provide installation assistance. Note: For the majority of installations, our Velomitor® family of velocity transducers, which incorporate solid-state technology, represent superior performance and robustness for casing velocity measurement applications. However, the sensor family currently has no sensors with a low frequency range similar to the 330505 Low Frequency Velocity Sensor.