Proximity sensors work on the eddy current principle. A proximity system consists of an eddy current probe, extension cable and driver. A high-frequency RF signal is generated by the driver, sent through the extension and probe cables and radiated from the probe tip. The tip consists of a precision wound copper coil inside a chemical and temperature resistant PEEK case.

The tip is either mounted on a threaded stainless steel rod allowing easy gap adjustment on a bracket via two locking nuts or a flat, low profile mount. The driver demodulates the signal, amplifies and linearises it to provide an output proportional to the probe to target gap and/or vibration of the target.

External overview

The Eddy Current Probe consists of a precision-wound copper coil inside a chemical- and temperature-resistant PEEK tip. This is mounted on a threaded stainless steel rod for easy gap adjustment or a flat, low-profile mount. It is supplied with 1m of integral overbraided coaxial cable. Operates up to 180˚C. Operating gap depends on the tip diameter. Can be used with any driver.

Current output drivers give a 4-20mA output directly proportional to the measured component and allow direct connection to PLCs and other industrial controllers. Can be used with any probe type.