{"product_id":"bently-nevada-76683-90-35-mm-proximitor-sensor","title":"Bently Nevada 76683-90 35 mm Proximitor Sensor","description":"\u003cp\u003eThe \u003cstrong\u003e76683\u003c\/strong\u003e, full part number \u003cstrong\u003e76683-90\u003c\/strong\u003e, is a high-precision 35 mm Proximitor Sensor engineered for industrial rotor dynamics and machinery protection monitoring. Powered by an externally connected -18 VDC to -24 VDC power supply, the instrument generates a radio frequency (RF) output voltage that is transmitted via the extension cable and probe lead straight to the probe tip coil. This coil radiates RF energy in the form of an alternating magnetic field, inducing localized eddy currents within the observed conductive target material. As the target surface moves closer to the probe tip, the eddy currents increase in amplitude, causing a distinct power loss within the probe-and-proximitor circuit loop and generating a corresponding, highly linear decrease in the coil RF voltage. The internal sensor electronics measure this peak amplitude fluctuation to deliver a proportional DC gap voltage output directly to monitoring systems, providing continuous displacement verification that remains constant if the gap is fixed and varies dynamically over time to trace physical shaft vibration or axial position changes.\u003c\/p\u003e\n\u003ch3\u003eOrdering Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e-90: System Length Option\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eRequires 9 m total probe-lead-plus-extension-cable length.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBently Nevada\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFull Part Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e76683-90\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor Tip Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e35 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMeasurement Principle\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEddy-current proximity scaling\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSupply Voltage Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-18 VDC to -24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRequired System Length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e9 m total (probe-lead-plus-extension-cable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-36 °C to +100 °C (-30 °F to +212 °F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSignal Output Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAnalog DC gap voltage \/ AC dynamic vibration voltage\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eEngineering Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThe 35 mm eddy-current scaling profile is explicitly calibrated to match the electrical properties of standard ferromagnetic target materials; alternative target alloys will alter the baseline gap voltage response curves.\u003c\/li\u003e\n\u003cli\u003eTotal physical length matching is mandatory for precision operations; mismatching a -90 suffix Proximitor with a 5 m cable network will disrupt internal tuned RF tank parameters and invalidate calibration data.\u003c\/li\u003e\n\u003cli\u003eInternal power losses within the driver circuit are directly proportional to the physical proximity of the observed surface, allowing highly accurate translation of raw RF modulation into clean analog signals.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eField Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eExecute mandatory shield grounding by bonding the outer extension cable shield strictly at the instrumentation rack ground bar while keeping the probe junction completely floating to intercept ground loops.\u003c\/li\u003e\n\u003cli\u003eRoute the high-frequency extension cable assemblies through dedicated steel conduit paths, ensuring complete isolation from adjacent heavy-power three-phase motor lines or alternating current switching buses.\u003c\/li\u003e\n\u003cli\u003eAdhere strictly to the recommended minimum bend radius boundaries for the coaxial extension leads to ensure internal dielectric layer symmetry remains undistorted during permanent panel routing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical \u0026amp; Procurement FAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can a 76683-90 Proximitor be installed alongside a standard 5-meter total length probe assembly?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: No, the -90 suffix indicates the internal tuning is matched exclusively for a 9 m total probe-lead-plus-extension-cable network; substituting a 5-meter setup will cause severe calibration shift errors.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the primary physical function of the alternating magnetic field generated at the 35 mm tip?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: The alternating magnetic field projects RF energy into the adjacent shaft surface to induce eddy currents, which are then monitored as a direct circuit power loss to map relative distance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this Proximitor device require a separate external transmitter module to interface with standard 3500 series racks?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: No, the 76683-90 converts the raw probe coil impedance changes directly into the standard analog DC gap voltage and dynamic AC signals required by the machine protection monitors.\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":52666861977963,"sku":"76683-90","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/bently-nevada-76683-90-35mm-proximitor-sensor-xnzdap1lg5o_fa00a5a1-6bb0-473e-9ca0-49b1a4c95fb2.jpg?v=1765449327","url":"https:\/\/www.plcprotech.com\/products\/bently-nevada-76683-90-35-mm-proximitor-sensor","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}