3500/46M BENTLY NEVADA  Digital Input Module

Upon discovering this, the refinery management launched an internal root cause analysis (RCA) and determined that the mismatched eddy current driver was the source of the false trips. By changing from the Proximitor with its known characteristics and replacing it with a competitor’s unknown product, the plant inadvertently “changed” critical machinery set points without the plant operators’ knowledge. Although eddy current systems are relatively easy to manufacture, they are very difficult to manufacture with repeatability and accuracy--something the Bently Nevada product line has done for more than 50 years. No manufacturer will warranty the mixing and matching of transducers, which can lead to loss of plant production as well as unsafe conditions.

Some parts manufacturers claim that their eddy current drivers are compatible with Bently Nevada probes and cables, even to the point of using our own part numbers. The system will appear to work at first, but often will give erroneous readings. While the machine is not running during installation the gap voltage can show similar levels. However, it can be seen clearly in the plots below what happens to the vibration measurements with a mixed system when the machine is running. Across the range of gaps in the sample testing that was done, the vibration in the 9-meter system (shown above) is generally attenuated, especially above 50 mils of gap as can be seen in the center plot of incremental scale factor (ISF). At the extreme gaps the displayed vibration for the mixed system can be attenuated by 25% or more. The ISF actually disappears above 80 mils of gap dropping below 150 mV/mil on a system that is supposed to be 200 mV/ mil! The 5-meter system that was tested actually shows the opposite, with greatly exaggerated vibration. Without the use of the Bently Nevada gold standard, the other manufacturer’s transducer system has little chance of being within specification. Depending on each probe and eddy current driver, the levels could read high or low.

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