Eric Saller and Duane Brzezowski of Industrial Monitoring Instrumentation, a division of PCB Piezotronics Inc, New York, USA, discuss the sensor requirements for monitoring the harmonics of gear-mesh frequencies which occur in turbo-compressors at very high frequencies. Particular attention is given to sensor selection and mounting techniques to ensure that valid and repeatable data is obtained. It is important to focus on all these factors before introducing any new machinery because impropersensor selection and mounting techniques can either obscure data that may be indicative of a fault condition or enhance false data that may lead to erroneous conclusions.
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