{"product_id":"330878-50-00-bently-nevada-3300-xl-50-mm-proximitor-sensor","title":"330878-50-00 | Bently Nevada 3300 XL 50 mm Proximitor Sensor","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eBently Nevada 330878-50-00\u003c\/strong\u003e is a \u003cstrong\u003e3300 XL 50 mm Proximitor Sensor\u003c\/strong\u003e designed for critical machinery protection systems. As part of the industry-standard 3300 XL series, it delivers high-accuracy vibration and position measurements for large steam turbine generators, compressors, and other rotating equipment. The \u003cstrong\u003e50 mm probe diameter\u003c\/strong\u003e provides the longest linear range in Bently Nevada's eddy current transducer line, making it ideal for measuring \u003cstrong\u003edifferential expansion (DE)\u003c\/strong\u003e and \u003cstrong\u003erotor expansion (RX)\u003c\/strong\u003e where significant axial growth differential exists between the turbine rotor and machine stator.\u003c\/p\u003e\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e 3300 XL 50 mm Proximitor Sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem Length:\u003c\/strong\u003e 5.0 meters (16.4 feet)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Option:\u003c\/strong\u003e Panel mount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasurement Range:\u003c\/strong\u003e 0 to 50 mm (0 to 2.0 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLinear Range:\u003c\/strong\u003e 27.9 mm (1,100 mils) — longest in the 3300 XL eddy current transducer family\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Resistance:\u003c\/strong\u003e 50 Ω\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCapacitance:\u003c\/strong\u003e 69.9 pF\/m (21.3 pF\/ft) typical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e -24 Vdc regulated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Temperature:\u003c\/strong\u003e -35°C to +177°C (-31°F to +351°F)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccuracy:\u003c\/strong\u003e ±1% of full-scale range\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e DC to 10 kHz (-3 dB)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnvironmental Rating:\u003c\/strong\u003e IP67\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Stainless steel probe, A380 aluminum housing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e Approx. 0.246 kg\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e USA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAgency Approval:\u003c\/strong\u003e 00 = None\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFeatures \u0026amp; Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLongest linear range available\u003c\/strong\u003e — 27.9 mm (1,100 mils) enables measurement of extreme differential expansion in large steam turbines without probe replacement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete system interchangeability\u003c\/strong\u003e — probe, extension cable, and proximitor sensor can be mixed and matched within the 3300 XL 50 mm family without recalibration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackwards compatible\u003c\/strong\u003e — accepts non-3300 XL series transducer system components for phased upgrade paths\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarge 50 mm coil diameter\u003c\/strong\u003e — provides superior signal stability and reduced sensitivity to target surface irregularities compared to smaller probe diameters\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePanel mount configuration\u003c\/strong\u003e — secure, traditional mounting for control cabinet installations with standard hardware\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLarge steam turbine generator differential expansion (DE) monitoring\u003c\/li\u003e\n\u003cli\u003eRotor expansion (RX) measurement in fossil and nuclear power plants\u003c\/li\u003e\n\u003cli\u003eGas turbine axial position monitoring with long-throw requirements\u003c\/li\u003e\n\u003cli\u003eHydroelectric generator thrust bearing position measurement\u003c\/li\u003e\n\u003cli\u003eLarge compressor and pump axial displacement monitoring\u003c\/li\u003e\n\u003cli\u003eAny application requiring measurement ranges exceeding 25 mm (1,000 mils)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eVerify system compatibility\u003c\/strong\u003e — confirm your monitoring system supports 3300 XL 50 mm transducer systems (e.g., 3500\/42M, 3500\/45).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount the proximitor sensor\u003c\/strong\u003e — use the panel mount holes to secure the sensor in a vibration-free location within 5.0 meters cable reach of the probe.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnect extension cable\u003c\/strong\u003e — join the probe to the proximitor using the 3300 XL 50 mm extension cable; ensure connectors are fully seated and locked.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApply -24 Vdc power\u003c\/strong\u003e — connect regulated -24 Vdc supply; verify output bias voltage of approximately -8.5 Vdc with probe at mid-gap.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSet probe gap\u003c\/strong\u003e — with the machine at rest, gap the probe to the target collar to achieve the recommended linear range midpoint (typically 13–14 mm from target).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVerify linear range\u003c\/strong\u003e — use a micrometer or calibration fixture to confirm the system responds linearly across the full 27.9 mm range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoute cables away from EMI sources\u003c\/strong\u003e — maintain 300 mm (12 in) separation from high-voltage cables, VFDs, and welding equipment.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between 330878-50-00 and 330878-90-00?\u003c\/strong\u003e\u003cbr\u003e\nA: The \u003cstrong\u003e330878-50-00\u003c\/strong\u003e has a \u003cstrong\u003e5.0 meter (16.4 ft)\u003c\/strong\u003e system length with panel mount, while the \u003cstrong\u003e330878-90-00\u003c\/strong\u003e has a \u003cstrong\u003e9.0 meter (29.5 ft)\u003c\/strong\u003e system length with panel mount. Both are 50 mm proximitor sensors with identical electrical performance. Choose based on your probe-to-cabinet cable run distance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I use this proximitor with an 8 mm or 11 mm probe?\u003c\/strong\u003e\u003cbr\u003e\nA: \u003cstrong\u003eNo.\u003c\/strong\u003e The 330878 series is specifically designed for 50 mm probes. The coil geometry, impedance matching, and scale factor are unique to the 50 mm system. Using an 8 mm or 11 mm probe will result in incorrect output scaling and potential damage.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What target material is required for factory calibration accuracy?\u003c\/strong\u003e\u003cbr\u003e\nA: Factory calibration is performed on \u003cstrong\u003eAISI 4140 steel\u003c\/strong\u003e targets 102 mm (4.0 in) diameter or larger. Using other target materials (e.g., stainless steel, Inconel) will shift the scale factor and may require in-situ system calibration.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is this sensor suitable for hazardous area installation?\u003c\/strong\u003e\u003cbr\u003e\nA: The \u003cstrong\u003e-00\u003c\/strong\u003e suffix indicates \u003cstrong\u003eno agency approvals\u003c\/strong\u003e. For hazardous area applications (Class I, Div 1 or ATEX Zone 0\/1), select a variant with -05 or -CN suffix or install with approved intrinsic safety barriers.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is the maximum cable length between probe and proximitor?\u003c\/strong\u003e\u003cbr\u003e\nA: The \u003cstrong\u003etotal system length is 5.0 meters\u003c\/strong\u003e including probe, extension cable, and proximitor lead. Do not exceed this length; signal degradation and increased noise will occur beyond the rated system length.\u003c\/p\u003e\n\n\u003ch3\u003eSelection Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eChoose the \u003cstrong\u003e330878-50-00\u003c\/strong\u003e when your probe-to-panel distance is \u003cstrong\u003e≤5.0 meters\u003c\/strong\u003e and you require standard panel mounting.\u003c\/li\u003e\n\u003cli\u003eIf your installation requires \u003cstrong\u003e9.0 meters\u003c\/strong\u003e of total cable run, upgrade to the \u003cstrong\u003e330878-90-00\u003c\/strong\u003e to avoid signal degradation from excessive extension cable splicing.\u003c\/li\u003e\n\u003cli\u003eFor \u003cstrong\u003eDIN rail mounting\u003c\/strong\u003e in high-density cabinets, look for the \u003cstrong\u003e-51\u003c\/strong\u003e suffix variants (not available in 50 mm; panel mount is standard).\u003c\/li\u003e\n\u003cli\u003eAlways verify your \u003cstrong\u003etarget material and minimum target diameter\u003c\/strong\u003e before ordering — 50 mm probes require larger targets than 8 mm systems.\u003c\/li\u003e\n\u003cli\u003eConfirm your monitoring system supports the 3300 XL 50 mm scale factor (typically 0.787 V\/mm or 20 mV\/mil) before procurement.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":53946976633016,"sku":"330878-50-00","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/330878-50-00.png?v=1787042358","url":"https:\/\/www.globalpetroparts.com\/products\/330878-50-00-bently-nevada-3300-xl-50-mm-proximitor-sensor","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}