Proximity Probe Field Calibration and Troubleshooting

Detecting Cabling Error, Sensitivity Drop by Simulating Vibration

The leading cause of failure in a machinery protection system relying upon Eddy current probes is cabling. The probe driver – also known as the proximitor – converts probe impedance to voltage and produces linear output. It requires precise cable lengths and types typically 1, 5 or 9 meters. Incorrect cabling causes dynamic output from the proximitor to be too high or low, leading to false or late alarm trips. Creating an amplitude linearity calibration certificate while confirming alert and alarm trips at running speed – as shown above – is the most effective method of ensuring correct operation of the machinery protection system.