Description
1. Product Introduction
Bently Nevada 330105‑02‑12‑10‑02‑00 is an 8 mm reverse‑mount eddy‑current displacement sensor probe of Baker Hughes‑Bently Nevada 3300 XL series. It strictly complies with API 670 international standard for rotating‑machinery condition‑monitoring. Designed for large sleeve‑bearing rotating equipment under special‑mounting conditions, it serves as core original sensing hardware for shaft‑system condition‑monitoring systems of industrial units.
This dedicated probe features reverse‑mount construction, 1/4‑40 UNF fine‑pitch thread, 12‑inch housing length, 1.0 m cable and standard ClickLoc connector configuration. Different from conventional forward‑mount probes, it adapts to special mounting scenarios such as confined internal unit spaces, rear‑embedded and enclosed measuring‑point locations. It avoids installation interference, space shortage and difficult‑maintenance issues associated with standard probes.
Forming a complete eddy‑current monitoring system together with 3300 XL‑series proximitors, it performs long‑term on‑line monitoring of key rotor‑dynamic parameters including shaft vibration, shaft displacement, rotor eccentricity, key‑phasor speed and unit thermal‑expansion difference for steam‑turbine units, compressor units, large‑size fans and pump sets.
Constructed with high‑temperature‑resistant industrial‑grade material and fully‑shielded flame‑retardant cable, it delivers advantages including non‑contact loss‑free measurement, oil resistance, moisture resistance, superior electromagnetic‑interference immunity and stable wide‑temperature operation. Suitable for harsh‑industrial sites in thermal‑power generation, gas‑power generation, petroleum refining, coal‑chemical industry and heavy‑metallurgy, it supports 7×24‑hour uninterrupted steady‑state unit operation. It is a dedicated core spare‑part for new‑installation matching of measuring‑points under special‑conditions, replacement of aged reverse‑mount probes and monitoring‑system retrofits.
2. Functions and Working Principle
Core Functions: This reverse‑mount eddy‑current probe realizes high‑precision acquisition of dynamic and static parameters of large rotating metal shafts under special‑mounting conditions. Its five core functions cover monitoring of rotor radial‑vibration amplitude, axial‑displacement wandering, rotor‑eccentricity detection, key‑phasor speed‑signal pickup and unit thermal‑expansion‑difference monitoring.
Benefiting from its proprietary reverse‑mount structural design, it fits scenarios inaccessible to conventional probes, such as enclosed equipment cavities, narrow mounting interlayers and rear‑embedded measuring‑points. It captures micron‑level minor run‑out, axial offset and dynamic deformation of rotors in real‑time, and linearly converts mechanical‑gap displacement into standard analog‑voltage signals for stable transmission to proximitors and downstream monitoring systems.
It provides accurate raw data for unit vibration‑trend analysis, early‑fault prediction, rotor‑stator rubbing troubleshooting, shaft‑displacement‑over‑limit interlock protection and equipment‑condition early‑warning, and effectively mitigates safety risks such as shaft‑system wear, abnormal unit vibration and equipment‑failure shutdown.
Working Principle: The matched 3300 XL proximitor supplies high‑frequency alternating excitation‑current to the built‑in coil of the probe, generating a stable high‑frequency alternating magnetic‑field at the probe sensing face. When the metal rotor approaches the probe magnetic‑field, closed eddy‑currents are induced on the rotor surface. The intensity and distribution density of eddy‑currents vary precisely and linearly with the gap distance between probe and rotor, which correspondingly changes the equivalent impedance and oscillation amplitude of the probe coil.
The system collects impedance variations in real‑time and converts them into linear analog‑voltage output via proprietary algorithms. Gap‑to‑output‑voltage maintains a standard‑linear correlation to achieve continuous precise measurement of vibration, displacement, eccentricity and other parameters.
Adopting integrated reverse‑mount construction, its sensing face fits inner‑side equipment measuring‑points after installation without external‑structural shielding or interference. There is no physical‑contact or mechanical‑wear throughout operation, making it suitable for long‑term continuous‑run of high‑speed rotors. Cooperated with proximitors, it completes loop self‑diagnosis for open‑circuit, short‑circuit, abnormal mounting‑gap and signal‑drift faults to fully guarantee authentic, continuous and reliable monitoring data.
3. Technical Features
Proprietary Reverse‑mount Structural Design: The dedicated reverse‑mount structure for 3300 XL series adapts to narrow‑enclosed‑space, embedded and rear‑hidden special measuring‑points of equipment. It resolves industry‑wide pain‑points of installation interference, space shortage and difficult‑maintenance for conventional forward‑mount probes with broader‑scenario compatibility.
High‑precision Linear‑measurement Performance: With standard 8 mm probe specification, rated sensitivity of 7.87 V/mm (200 mV/mil) and standard linear range of 2 mm, it achieves extremely low full‑span linear‑error. It accurately captures micron‑level rotor‑vibration and displacement variations and fully satisfies high‑precision‑monitoring requirements of API 670 industrial‑standard.
Non‑contact Loss‑free Long‑term Monitoring: It performs non‑contact measurement based on eddy‑current‑induction principle. No physical‑friction or mechanical‑loss exists between probe and high‑speed‑running rotors. It enables long‑term stable monitoring of unit shaft‑system dynamic‑parameters and greatly reduces equipment‑maintenance cost and shutdown‑loss.
Superior Adaptability to Harsh‑working‑conditions: Made of industrial‑grade high‑temperature‑resistant and anti‑aging engineering‑material with wide operating‑temperature range. Both probe and cable are oil‑resistant, moisture‑resistant, corrosion‑resistant and dust‑proof. They withstand long‑term exposure to complex harsh‑conditions including high‑temperature, vibration and heavy‑electromagnetic‑interference around units for extended service‑life.
Convenient Compatibility with Standardized‑Interfaces: Equipped with original‑equipment Mini ClickLoc quick‑disconnect connector, 1.0 m standard‑shielded cable and 1/4‑40 UNF industrial fine‑thread. It features firm mounting‑fixation, convenient wiring and simple configuration, with seamless compatibility across the full range of 3300 XL proximitors for high universality.
- Full‑dimensional Intelligent Fault‑self‑diagnosis: Linked with matched proximitors, it automatically identifies faults such as probe open‑circuit, short‑circuit, excessive mounting‑gap, signal‑anomaly and loop‑impedance‑deviation. It pinpoints fault‑locations and uploads alarm‑events to the system, lowering maintenance‑troubleshooting difficulty and ensuring stable commissioning of monitoring systems.
4. Specifications
Basic Parameters
Product Model: 330105‑02‑12‑10‑02‑00 Brand‑Manufacturer: Bently Nevada (Baker Hughes) Product Type: 3300 XL 8 mm Reverse‑mount Eddy‑current Displacement‑sensor Probe Applicable System: Bently Nevada 3300 XL‑series proximitors and complete condition‑monitoring systems Compliance Standard: API 670 Industrial Standard for Rotating‑machinery Condition‑monitoring Model Definition: 330105 = Reverse‑mount probe series; 02 = 1/4‑40 UNF thread; 12 = 12‑inch housing length; 10 = 1.0 m cable; 02 = ClickLoc connector; 00 = Standard non‑certified version
Core Electrical‑performance Parameters
Rated Sensitivity: 7.87 V/mm (200 mV/mil) Standard Linear Range: 0～2 mm Measurement Accuracy: High full‑span linearity, error ≤ ±0.1 % of reading Frequency Response: 0～10 kHz, fully‑covering vibration‑frequency‑range during unit start‑stop and steady‑state‑operation Power Supply: ‑17.5 VDC～‑26 VDC DC power supplied by matched proximitor Insulation Performance: High insulation‑impedance, effectively preventing electric‑leakage and signal‑interference for stable transmission
Mechanical‑dimension Parameters
Probe Specification: 8 mm standard‑monitoring probe, reverse‑mount embedded‑structure Mounting Thread: 1/4‑40 UNF standard fine‑pitch imperial‑thread Housing Length: 12 inch (special‑extended housing for deep‑buried measuring‑points) Cable Length: 1.0 m original‑equipment standard tri‑axial‑shielded cable Connector Type: Mini ClickLoc quick‑latching coaxial‑connector Structural Characteristics: Corrosion‑resistant anti‑aging housing, fully‑shielded flame‑retardant cable, anti‑signal‑crosstalk design
Environmental‑condition Parameters
Probe Operating Temperature: ‑52 ℃～+177 ℃ Cable Operating Temperature: ‑52 ℃～+177 ℃ Storage Temperature: ‑40 ℃～+85 ℃ Operating Humidity: 5 %～95 %RH, non‑condensing Condition Resistance: Oil‑resistance, moisture‑resistance, dust‑resistance, industrial‑grade electromagnetic‑interference immunity, resistance to mechanical‑vibration and bending
5. Application Scenarios
Bently Nevada 330105‑02‑12‑10‑02‑00 reverse‑mount probe is widely deployed in on‑line condition‑monitoring systems for large‑scale rotating‑machinery under special‑working‑conditions across thermal‑power generation, gas‑power generation, petroleum‑refining, coal‑chemical‑industry, oil‑gas‑storage‑transportation and heavy‑metallurgy industries. It specifically addresses monitoring challenges for confined‑location measuring‑points inaccessible to conventional probes.
Typical application‑scenarios include: shaft‑system vibration and displacement monitoring for enclosed‑cavity of steam‑turbine generator‑sets and gas‑turbine units; internal‑embedded measuring‑point monitoring of large‑scale centrifugal / screw‑compressor equipment; data‑acquisition from deep‑buried and rear‑hidden measuring‑points on large‑industrial fans and high‑pressure water‑pumps; rotor‑eccentricity and thermal‑expansion‑difference monitoring inside narrow‑interlayer spaces; precise pickup of unit key‑phasor speed‑signals; condition‑monitoring and anomaly‑early‑warning during start‑stop cycles of special‑structure equipment; probe‑replacement for special measuring‑points on legacy‑units; supporting retrofits of monitoring‑systems under special‑conditions; fault‑diagnosis and trend‑analysis for high‑risk rotating‑equipment in confined‑spaces.
As a dedicated reverse‑mount probe within Bently Nevada 3300 XL series, it delivers core‑strengths of special‑structural‑adaptability, high‑precision, high‑stability and maintenance‑free‑operation. It perfectly fits various non‑conventional‑mounting‑conditions and accurately captures incipient minor‑hidden‑faults of shaft‑systems. It provides core‑data‑support for condition‑based equipment‑maintenance, safety‑interlock‑protection and safe‑efficient unit‑operation, and serves as an exclusive original‑equipment spare‑part for maintenance, new‑installation and retrofit of condition‑monitoring‑systems for rotating‑equipment under special‑industrial‑conditions.
