Description
Bently Nevada 330851‑04‑00‑020‑50‑00‑00
3300‑XL 11 mm NSv Eddy‑Current Proximity Probe Assembly (Standard‑Temperature, Non‑Hazardous‑Area)
Product Overview
The 330851‑04‑00‑020‑50‑00‑00 belongs to Bently Nevada 3300‑XL 11 mm NSv non‑contact eddy‑current transducer series. This 11 mm probe is engineered for large‑shaft heavy‑duty turbomachinery, delivering high‑range displacement measurement for radial vibration and axial thrust position monitoring. It is widely deployed on large steam turbines, heavy‑duty compressors and industrial gas turbines, complying with API‑670 rotating‑machinery protection standards. The suffix‑00 indicates no hazardous‑area intrinsic‑safety certifications, for general‑purpose non‑explosive industrial installation.
Critical Compatibility Warning
- This is NSv ClickLoc interface 11 mm proximity probe. Only compatible with 3300‑XL NSv 11 mm matched ClickLoc extension cables. Not interchangeable with 8 mm NSv probes, legacy Microdot probes / cables or ETR series components.
- Total calibrated transducer loop length = probe integral pigtail length + NSv extension cable length. The total loop length programmed in paired NSv proximitor must strictly match physical total length. Mismatched length will cause sensitivity deviation and measurement error.
- Termination: Miniature ClickLoc quick‑lock coaxial connector. Do not cut, splice or modify factory‑molded pigtail assembly. This unit is restricted to non‑hazardous area installation.
Part Number Decoding
- 330851：Base model, 3300‑XL 11 mm NSv proximity probe
- ‑04：Mounting thread: 1/2‑20 UNF
- ‑00：Special feature: no extra modification
- ‑020：Probe housing overall length: 200 mm
- ‑50：Integral non‑armored pigtail cable length: 5.0 meters
- ‑00：Connector: Miniature ClickLoc
- ‑00：Certification: No ATEX / IECEx / CSA hazardous‑area approvals
330851-04-00-020-50-00-00
Key Specifications
| Parameter | Value |
|---|---|
| Part Number | 330851‑04‑00‑020‑50‑00‑00 |
| Series | 3300‑XL 11 mm NSv Proximity Transducer |
| Measurement Principle | Non‑contact eddy‑current displacement |
| Nominal Sensitivity | 7.87 V/mm (200 mV/mil), ±5 % tolerance |
| Linear Measurement Range | 0.89 mm ~ 2.79 mm (35‑110 mil) |
| Probe Tip Diameter | 11 mm |
| Mounting Thread | 1/2‑20 UNF |
| Housing Overall Length | 200 mm |
| Integral Pigtail | 5.0 m, non‑armored standard‑grade FEP insulation |
| Connector Type | Miniature ClickLoc™ gold‑plated quick‑lock coaxial |
| Frequency Response | 0 Hz‑10 kHz |
| Operating Temperature Range | ‑52 °C ~ +121 °C (standard temperature rating) |
| Housing Material | 316 stainless steel |
| Certifications | API‑670 compliant; No hazardous‑area intrinsic‑safety approvals |
| Country of Origin | USA |
| Weight | ≈0.48 kg |
Main Features
- 11 mm large‑aperture probe design: Extended linear measurement range, optimized for heavy‑duty large‑diameter rotating shafts, suitable for high‑vibration amplitude working conditions.
- 200 mm long threaded housing with 1/2‑20 UNF thread: Adapts to deep‑installation bearing‑housing mounting ports on large turbomachinery.
- 5.0 m factory‑calibrated non‑armored integral pigtail with Miniature ClickLoc connector: Matches 330931 series 11 mm NSv ClickLoc extension cables to achieve required total transducer‑loop length.
- Standard temperature performance rating: For general‑purpose plant ambient conditions; not applicable for continuous high‑radiant‑heat zones requiring ETR high‑temperature variants.
- Heavy‑duty industrial mechanical construction: Resists turbine oil‑mist, humidity and severe machinery vibration, meets API‑670 protection requirements for critical large‑scale rotating assets.
- Full interoperability within 3300‑XL 11 mm NSv ClickLoc transducer ecosystem.
Typical Application Scenarios
- Radial vibration and axial thrust position monitoring for large‑size steam turbines, heavy‑duty centrifugal compressors and industrial gas turbines in non‑hazardous industrial areas
- Protection monitoring for high‑power rotating equipment with large‑diameter rotor shafts
- Conventional power‑plant machinery‑house and refinery non‑explosive‑zone installations
- System integration with Bently Nevada 3500 rack 11 mm‑NSv‑compatible proximitor input channels
- Spare‑part replacement for existing 11 mm NSv proximity measurement loops
Related & Recommended Alternative Models
| Model | Description |
|---|---|
| 330851‑04‑00‑020‑50‑00‑05 | 11 mm NSv probe, 200 mm housing, 5 m pigtail, multi‑hazardous‑area approvals |
| 330851‑04‑00‑015‑50‑00‑00 | 11 mm NSv probe, 150 mm housing, 5 m pigtail, non‑hazardous‑area |
| 330931‑100‑00‑00 | 10.0 m non‑armored 11 mm NSv ClickLoc extension cable |
| 330854‑04‑00‑020‑50‑00‑00 | 11 mm ETR high‑temperature NSv probe variant |
| 129716‑173‑037‑15‑05 | 8 mm Microdot probe (incompatible, reference‑only) |
Compatible Components & Accessories
- NSv Extension Cables: 330931 series 11 mm NSv ClickLoc extension cables (straight / right‑angle versions)
- Monitoring Hardware: 11 mm‑NSv‑qualified proximitor modules, Bently Nevada 3500 rack 11 mm NSv monitor channels
- Mechanical Accessories: Probe mounting lock‑nut, probe mounting shell assembly, 43501‑02‑04‑02 low‑pressure cable‑seal assembly, 43574‑04 multi‑hole grommet
- Installation Consumables: Anti‑seize compound for mounting threads, cable clamps for strain‑relief, high‑temperature cable ties
- Calibration Tool: 11 mm NSv static gap calibration fixture
Installation and Configuration Guide
Warning: Installation must be performed by qualified instrument technicians. Always take original Bently Nevada 3300‑XL NSv transducer‑system manual as primary technical reference. This model carries no hazardous‑area certifications and shall not be deployed in explosive classified zones.
- Pre‑installation Total‑Length Calculation
- Calculate total NSv transducer loop length = probe integral pigtail (5.0 m) + selected 11 mm NSv extension‑cable length.
- Ensure total physical length matches the loop‑length parameter configured in paired NSv proximitor. Length mismatch causes sensitivity drift and measurement inaccuracy.
- Probe Mechanical Mounting
- Install matched probe mounting shell onto bearing housing per mechanical drawing.
- Apply anti‑seize compound to 1/2‑20 UNF probe thread. Screw probe into mounting shell, adjust probe‑to‑shaft working gap to target mid‑linear‑range position, tighten lock‑nut to specified torque.
- Confirm probe tip maintains safe clearance and will never contact rotating‑shaft surface across full operating speed and thermal expansion range.
- Cable Routing & ClickLoc Connector Mating
- Route NSv transducer cable separately from high‑power AC, VFD and contactor wiring to suppress EMI‑induced noise.
- Follow minimum static bending radius requirement; avoid sharp kinks. Never pull cable assembly via ClickLoc connector body.
- Align ClickLoc connector key‑slot, push in and rotate clockwise until audible “click” for finger‑tight locking. Wrench tightening is strictly forbidden.
- Mount strain‑relief clamps near connector joint. Fit approved cable‑seal fitting when cable penetrates machine casing.
- System Commissioning
- Complete full NSv transducer‑loop assembly and power‑up proximitor / monitoring rack.
- Read static gap voltage to verify mechanical gap setting. Perform static‑gap calibration test with 11 mm NSv calibration fixture to validate system sensitivity.
- Clear Not‑OK fault status; configure vibration and thrust alarm / trip thresholds per project machinery specification.
- Maintenance & Troubleshooting
- During machinery turnaround, inspect probe locking torque, check ClickLoc connector for oil contamination and corrosion; inspect outer jacket for abrasion, cracking or aging.
- Gap‑voltage drift, abnormal vibration reading or persistent Not‑OK faults may result from improper installation gap, loose ClickLoc connection, cable damage or incorrect programmed loop length.
- Replace complete factory probe assembly upon pigtail or probe‑tip damage; field‑splicing of integral probe pigtail cable is strictly prohibited.
Supplementary Remark
330851‑04‑00‑020‑50‑00‑00 is a 3300‑XL 11 mm standard‑temperature NSv eddy‑current proximity probe with 1/2‑20 UNF thread, 200 mm housing and 5.0 m integral pigtail. Without hazardous‑area certifications, it is designed for radial vibration and thrust monitoring of large‑shaft heavy‑duty turbomachinery under non‑explosive industrial environments. It only works with 11 mm NSv ClickLoc system components and cannot interoperate with 8 mm NSv, Microdot or ETR series hardware. Before commissioning, cross‑check 11 mm probe target requirements, total transducer‑loop length, ClickLoc interface and site area classification against project BOM and mechanical drawings.
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