Hydrostatic bearings are used in large plant and machinery such as stone mills, telescopic installations etc. Monitoring the gap size is a critical factor, as any disturbances in the hydraulics can cause pressure drops, which in extreme cases, can cause the gap to close, resulting in damage to the bearings and ultimately system failure. Here, it is important to have a system that is easy to install as also ageing plants have to be retrofitted. Due to the long service life and the worldwide use of this plant, the sensor should be easy to replace. For this reason, non-contact eddy current displacement sensors of the eddyNCDT 3001 series are used.