{"product_id":"330878-90-00-bently-nevada-3300-xl-50-mm-proximitor-sensor","title":"330878-90-00 | Bently Nevada 3300 XL 50 mm Proximitor Sensor","description":"\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eBently Nevada 330878-90-00\u003c\/strong\u003e is a \u003cstrong\u003e3300 XL 50 mm Proximitor Sensor\u003c\/strong\u003e with a \u003cstrong\u003e9.0 meter (29.5 feet) system length\u003c\/strong\u003e and panel mount configuration. Designed for critical rotating machinery protection, it provides the longest linear range in Bently Nevada's eddy current transducer portfolio — \u003cstrong\u003e27.9 mm (1,100 mils)\u003c\/strong\u003e — making it the standard choice for measuring \u003cstrong\u003edifferential expansion (DE)\u003c\/strong\u003e and \u003cstrong\u003erotor expansion (RX)\u003c\/strong\u003e on large steam turbine generators where rotor-to-stator growth differentials are substantial.\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 9.0 meters (29.5 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)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Resistance:\u003c\/strong\u003e 50 Ω\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\u003eStorage Temperature:\u003c\/strong\u003e -51°C to +100°C (-60°F to +212°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 A380 aluminum housing, stainless steel probe\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e Approx. 0.3 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\u003eExtended 9.0 meter system length\u003c\/strong\u003e — accommodates installations where the monitoring cabinet is remote from the machine train, eliminating the need for intermediate junction boxes or signal repeaters\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLongest linear range in the portfolio\u003c\/strong\u003e — 27.9 mm enables redundant DE measurements using complementary transducer arrangements on opposite sides of a collar\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete interchangeability\u003c\/strong\u003e — all 3300 XL 50 mm probes, extension cables, and proximitor sensors are interchangeable without field recalibration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBackwards compatible architecture\u003c\/strong\u003e — allows phased upgrades from legacy 3300 RAM or 3000\/7000 series systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePanel mount for secure cabinet installation\u003c\/strong\u003e — traditional mounting with standard hardware for long-term stability\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 monitoring with remote monitoring cabinets\u003c\/li\u003e\n\u003cli\u003eCombined cycle power plant HRSG and steam turbine DE\/RX measurement\u003c\/li\u003e\n\u003cli\u003eNuclear power plant main turbine axial growth monitoring\u003c\/li\u003e\n\u003cli\u003eLarge industrial gas turbines with extended cable routing requirements\u003c\/li\u003e\n\u003cli\u003eRefinery cracking compressor axial position monitoring\u003c\/li\u003e\n\u003cli\u003eAny critical rotating machine where probe-to-cabinet distance exceeds 5 meters\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eVerify monitoring system compatibility\u003c\/strong\u003e — ensure your rack (e.g., 3500\/42M, 3500\/45) supports 3300 XL 50 mm transducer systems and the associated scale factor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlan cable routing\u003c\/strong\u003e — with 9.0 meters total system length, route the extension cable through cable trays or conduits, maintaining 300 mm separation from high-voltage or VFD cables.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount proximitor in control cabinet\u003c\/strong\u003e — secure using panel mount holes; ensure the mounting surface is free from vibration and thermal cycling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnect probe and extension cable\u003c\/strong\u003e — join the 50 mm probe to the extension cable, then to the proximitor; verify all connectors are fully locked.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApply -24 Vdc power\u003c\/strong\u003e — connect a regulated -24 Vdc supply; measure output bias voltage (~-8.5 Vdc) to confirm proper operation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGap probe to target\u003c\/strong\u003e — with machine at rest, set gap to the midpoint of the linear range (approximately 13–14 mm from the DE collar).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerform system verification\u003c\/strong\u003e — use a calibration fixture or micrometer to sweep the probe through its linear range and verify ±1% accuracy.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between 330878-90-00 and 330878-50-00?\u003c\/strong\u003e\u003cbr\u003e\nA: The \u003cstrong\u003e330878-90-00\u003c\/strong\u003e provides \u003cstrong\u003e9.0 meters\u003c\/strong\u003e of total system length versus \u003cstrong\u003e5.0 meters\u003c\/strong\u003e for the 330878-50-00. Both use panel mount and have identical electrical specifications. Choose 90 for remote monitoring cabinets; choose 50 for compact installations.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I extend the cable beyond 9.0 meters?\u003c\/strong\u003e\u003cbr\u003e\nA: \u003cstrong\u003eNo.\u003c\/strong\u003e Exceeding the rated system length degrades signal quality, introduces noise, and voids the accuracy specification. If longer runs are required, relocate the proximitor closer to the machine or use a signal conditioner with separate cable runs.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is the minimum target size for accurate measurement?\u003c\/strong\u003e\u003cbr\u003e\nA: Bently Nevada specifies a minimum target of \u003cstrong\u003e102 mm (4.0 in) diameter\u003c\/strong\u003e of AISI 4140 steel for factory-calibrated accuracy. Smaller targets or different materials require in-situ calibration.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is this suitable for redundant DE measurement configurations?\u003c\/strong\u003e\u003cbr\u003e\nA: \u003cstrong\u003eYes.\u003c\/strong\u003e The 27.9 mm linear range supports both \u003cstrong\u003esame-side redundant\u003c\/strong\u003e and \u003cstrong\u003ecomplementary opposite-side\u003c\/strong\u003e transducer arrangements. For complementary setups, two 50 mm systems can measure up to 56 mm total DE range.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Does this proximitor require special mounting considerations for CE compliance?\u003c\/strong\u003e\u003cbr\u003e\nA: No. The 3300 XL series has improved RFI\/EMI immunity that achieves CE mark approvals without special mounting or shielding considerations beyond standard industrial practice.\u003c\/p\u003e\n\n\u003ch3\u003eSelection Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSelect \u003cstrong\u003e330878-90-00\u003c\/strong\u003e when your probe-to-panel distance is \u003cstrong\u003ebetween 5.1 and 9.0 meters\u003c\/strong\u003e. For shorter runs, the 330878-50-00 is more cost-effective.\u003c\/li\u003e\n\u003cli\u003eVerify that your \u003cstrong\u003eDE collar or target\u003c\/strong\u003e is sufficiently large (≥102 mm diameter) and made of AISI 4140 steel for factory-calibrated accuracy.\u003c\/li\u003e\n\u003cli\u003eFor \u003cstrong\u003ehazardous area installations\u003c\/strong\u003e, you will need intrinsic safety barriers or a variant with hazardous area approvals (-05 suffix).\u003c\/li\u003e\n\u003cli\u003eConsider ordering a \u003cstrong\u003espare extension cable\u003c\/strong\u003e (330130-XX-XX-05 for 50 mm systems) to minimize downtime during cable damage events.\u003c\/li\u003e\n\u003cli\u003eConfirm your \u003cstrong\u003emonitoring system configuration\u003c\/strong\u003e supports 50 mm transducer scale factors before procurement.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":53947007991992,"sku":"330878-90-00","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0935\/6132\/3704\/files\/330878-90-00_2.png?v=1787042359","url":"https:\/\/www.globalpetroparts.com\/products\/330878-90-00-bently-nevada-3300-xl-50-mm-proximitor-sensor","provider":"Global Petro Parts Automation","version":"1.0","type":"link"}