Description
1. Product Introduction
Bently Nevada 330102‑20‑55‑10‑02‑CN is an 8 mm armored extended‑housing eddy‑current displacement proximity probe of the Baker Hughes‑Bently Nevada 3300 XL series. Strictly compliant with the API 670 international standard for rotating‑machinery condition monitoring, it serves as original core sensing hardware for shaft‑system monitoring of large‑scale rotating‑equipment under long‑distance, complex‑wiring and high‑protection operating conditions.
This is a standard‑mount probe featuring armored construction, 1/4‑40 UNF unified fine thread, 55‑inch extended housing, 5.0‑meter original‑equipment shielded cable, standard Mini ClickLoc connector and CN regional‑compliant version for Chinese market. It is specially engineered for deep‑recess measuring‑points inside equipment cavities, long‑distance through‑type mounting, outdoor high‑risk environments and harsh scenarios where cables are subject to abrasion and pulling stress. It effectively compensates deficiencies of conventional non‑armored probes such as insufficient mechanical protection, limited housing length and vulnerability of long cables to physical damage.
When paired with 3300 XL‑series proximitor sensors, it forms a complete eddy‑current monitoring system widely applied to heavy‑duty sleeve‑bearing rotating‑machinery including steam‑turbine units, gas‑turbines, large centrifugal compressors, industrial fans and high‑pressure pump sets. It performs long‑term on‑line monitoring of key rotor‑dynamic parameters: radial shaft vibration, axial shaft displacement, rotor eccentricity, Keyphasor speed and unit thermal‑expansion difference.
Manufactured with military‑grade high‑temperature‑resistant anti‑aging materials, metallic armor shielding layer and fully‑shielded flame‑retardant tri‑axial cable, it delivers outstanding performance including non‑contact loss‑free measurement, pull‑resistance, crush‑resistance, oil resistance, superior electromagnetic‑interference immunity and stable wide‑temperature operation. Suitable for severe industrial sites in thermal‑power generation, gas‑power generation, petroleum refining, coal‑chemical industry, oil‑gas storage‑transportation and heavy‑metallurgy, it supports 7×24‑hour uninterrupted steady‑state unit operation. It acts as dedicated original‑equipment spare‑part for new‑installation of deep‑recess long‑reach measuring‑points, replacement of aged armored probes and monitoring‑system retrofits for high‑risk operating conditions.
2. Functions and Working Principle
Core Functions: This armored extended‑housing eddy‑current proximity probe realizes high‑precision acquisition of dynamic and static parameters for large metal rotating shafts under deep‑recess long‑reach and high‑protection conditions. Its five core monitoring functions cover rotor radial‑vibration‑amplitude monitoring, axial‑displacement wandering monitoring, rotor‑eccentricity detection, Keyphasor speed‑signal pickup and unit thermal‑expansion‑difference monitoring.
Benefiting from high‑strength structural design of 55‑inch extended housing plus 5‑meter long cable and metallic armor, it perfectly adapts to deep‑cavity measuring‑points of equipment, long‑distance through‑type mounting, exposed outdoor wiring and high‑risk scenarios prone to mechanical abrasion and pulling force. It addresses common limitations of ordinary probes with short housing and no armor which cannot reach deep‑recess installation positions. 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 proximitor sensors and downstream monitoring systems, without being affected by long‑cable transmission loss and on‑site mechanical damage.
It provides high‑precision raw data for unit vibration‑trend analysis, early‑fault prediction, rotor‑stator‑rubbing hazard inspection and shaft‑displacement‑over‑limit interlock protection as well as equipment‑condition early‑warning. It effectively mitigates equipment safety risks such as shaft‑system abrasion, abnormal unit vibration and unplanned shutdown.
Working Principle: The matched 3300 XL proximitor sensor supplies high‑frequency alternating excitation‑current to the internal coil of the probe, generating a stable high‑frequency alternating magnetic‑field at the probe sensing face. As the metal rotor approaches this 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 original‑equipment algorithms. A standard linear correlation is maintained between probe‑to‑target gap and output‑voltage to achieve continuous reliable measurement of vibration, displacement, eccentricity and thermal‑expansion‑difference.
Adopting integrated long‑reach armored structure with rigid housing and metal‑protected cable, the probe resists on‑site mechanical pulling, crushing and abrasion. Long‑cable transmission achieves zero signal attenuation and interference drift. Operating without physical contact or mechanical wear, it suits long‑term continuous‑run of large heavy‑duty high‑speed rotors. Cooperated with the proximitor sensor, it implements self‑diagnosis for loop open‑circuit, short‑circuit, abnormal mounting‑gap, signal‑drift and impedance‑deviation faults to fully guarantee authentic, continuous and reliable monitoring data for long‑distance measurement.
3. Technical Features
Armored High‑Strength Protection Design: Equipped with dedicated metallic armor structure, the cable is resistant to pulling, crushing, abrasion and external mechanical damage. It perfectly fits high‑risk wiring scenarios including outdoor exposure, equipment cavities and narrow passages prone to scraping. Its protection performance far exceeds ordinary non‑armored probes and greatly improves field adaptability and service life.
Deep‑Reach Adaptability with Extended Housing: Custom‑built 55‑inch extended housing meets installation requirements for deep equipment cavities, through‑type mounting and remote measuring‑point extension. It solves the problem that conventional short‑housing probes cannot access deep‑recess locations and accommodates special mechanical structures of large heavy‑duty units.
Industrial‑grade High‑precision Stable Measurement: Standard 8 mm probe specification, rated sensitivity 7.87 V/mm (200 mV/mil), standard linear range 2 mm and extremely low full‑scale linear error. Long‑cable transmission brings zero attenuation and zero phase shift. It accurately captures micron‑level rotor vibration and displacement variations and fully satisfies API 670 high‑precision industrial‑monitoring specifications.
Non‑contact Loss‑free Long‑term Monitoring: Eddy‑current‑induction‑based non‑contact measurement brings no physical friction or mechanical loss between probe and high‑speed‑rotating rotors. It enables long‑term stable monitoring of unit shaft‑system dynamic‑parameters, greatly reducing maintenance frequency and shutdown‑related losses for heavy‑duty equipment and supporting multi‑year continuous unit operation.
Superior Adaptability to Harsh Working Conditions: Constructed from industrial‑grade high‑temperature‑resistant anti‑aging engineering‑materials plus metallic armor, it features wide operating‑temperature range. The whole unit is oil‑resistant, moisture‑resistant, corrosion‑resistant and dust‑proof with strong electromagnetic‑interference immunity. It sustains complex severe operating‑conditions including high‑temperature, violent mechanical‑vibration, harsh outdoor environment and mechanical scraping & crushing.
- Standardized Universal Compatibility & Intelligent Self‑diagnosis: Fitted with original Mini ClickLoc self‑locking quick‑disconnect connector, 5‑meter standard tri‑axial‑shielded armored cable and 1/4‑40 UNF standard unified fine thread. It features firm mounting, convenient wiring and simple configuration, and achieves seamless compatibility with full range of 3300 XL proximitor sensors. It automatically identifies loop faults and pinpoints abnormal positions, lowers maintenance‑troubleshooting difficulty under high‑risk conditions and ensures stable commissioning of monitoring systems.
4. Specifications
Basic Parameters
Product Model: 330102‑20‑55‑10‑02‑CN Brand‑Manufacturer: Bently Nevada (Baker Hughes) Product Type: 3300 XL 8 mm Armored Extended‑housing Eddy‑current Displacement Proximity Probe Applicable System: Bently Nevada 3300 XL‑series proximitor sensors and complete condition‑monitoring systems Compliance Standard: API 670 Industrial Standard for Rotating‑machinery Condition‑monitoring Model Definition: 330102 = Extended‑housing probe series; 20 = Armored construction; 55 = 55‑inch overall housing length; 10 = 5.0 m cable; 02 = Mini ClickLoc connector; CN = Regional‑compliant version for Chinese market
Core Electrical Performance Parameters
Rated Sensitivity: 7.87 V/mm (200 mV/mil) Standard Linear Range: 0～2 mm Measurement Accuracy: High full‑scale 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 sensor Insulation Performance: High insulation‑impedance; armored shielding structure prevents electric‑leakage and signal interference; 5‑meter long‑cable realizes attenuation‑free signal transmission with outstanding stability.
Structural Dimension Parameters
Probe Specification: 8 mm standard proximity probe, armored extended‑housing structure Mounting Thread: 1/4‑40 UNF standard unified fine thread Housing Length: 55‑inch extended housing for deep‑recess and through‑type measuring‑points Cable Length: 5.0 m original‑equipment standard tri‑axial‑shielded armored cable Connector Type: Mini ClickLoc self‑locking coaxial connector Structural Characteristics: Metallic armor protection, corrosion‑resistant anti‑aging housing, fully‑shielded flame‑retardant cable, anti‑pull & anti‑crush mechanical performance, anti‑signal‑crosstalk design Protection Grade: High‑level industrial protection, suitable for outdoor, high‑risk and abrasion‑prone complex field conditions
Environmental Working 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, mechanical pull‑&‑crush resistance, industrial‑grade high electromagnetic‑interference immunity, aging‑resistance and corrosion‑resistance
5. Application Scenarios
Bently Nevada 330102‑20‑55‑10‑02‑CN armored extended‑housing probe is widely adopted in on‑line condition‑monitoring systems for large heavy‑duty rotating‑machinery operating under deep‑recess measuring‑points, long‑distance wiring, outdoor high‑risk and mechanical‑damage‑prone conditions across thermal‑power generation, gas‑power generation, petroleum‑refining, coal‑chemical industry, oil‑gas storage‑transportation and heavy‑metallurgy industries. It acts as exclusive core sensing hardware for measuring‑points requiring long‑reach installation and high‑level mechanical protection.
Typical application‑scenarios include: shaft vibration and displacement monitoring for deep cavities and through‑type structures of steam‑turbine and gas‑turbine generator‑sets; data acquisition for deep‑recess measuring‑points on large heavy‑duty centrifugal / screw compressors; condition‑monitoring with long‑distance wiring for field‑deployed large‑industrial fans and high‑pressure water‑pumps; rotor‑eccentricity and thermal‑expansion‑difference monitoring in abrasion‑prone zones of high‑risk equipment; precise long‑distance pickup of unit Keyphasor speed‑signals; new‑installation support for special‑structure measuring‑points on heavy‑duty units; replacement of aged legacy long‑reach armored probes; mechanical‑protection upgrade retrofits for high‑risk monitoring systems; fault‑diagnosis and operating‑trend analysis for heavy‑duty rotating‑equipment with long‑distance wiring.
As a dedicated armored extended‑housing probe within Bently Nevada 3300 XL series, it features excellent deep‑recess fitting capability, high‑strength armored protection, loss‑free long‑cable transmission, high precision, high stability and maintenance‑free operation. It resolves key pain‑points of ordinary probes such as insufficient housing length, weak mechanical protection, vulnerable long cables and signal attenuation. It accurately captures incipient minor hidden‑faults of heavy‑duty shaft‑systems, and delivers core‑data‑support for condition‑based equipment‑maintenance, safety interlock‑protection and safe‑efficient unit‑operation. It serves as exclusive original‑equipment spare‑part for maintenance, new‑installation and retrofits of rotating‑equipment monitoring‑systems under industrial high‑risk, deep‑recess and long‑distance operating‑conditions.
