Description
1. Product Introduction
Bently Nevada 330101‑00‑08‑20‑12‑05 is a standard 8 mm eddy‑current displacement sensor probe of Baker Hughes‑Bently Nevada 3300 XL series. It strictly complies with API 670 international standard for rotating‑machinery monitoring and serves as core original sensing hardware for condition‑monitoring systems of large‑scale industrial rotating equipment.
This non‑armored, standard‑temperature‑grade probe comes with 2.0 m cable and M12×1 standard mounting thread. Designed for sleeve‑bearing rotating equipment such as steam‑turbine generator sets, gas turbines, centrifugal compressors, large‑size fans and water pumps, it forms 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 rotational speed and unit thermal expansion difference.
Constructed with high‑strength high‑temperature‑resistant engineering material and fully‑shielded flame‑retardant tri‑axial cable, it features non‑contact measurement, zero wear, oil resistance, moisture resistance and excellent electromagnetic‑interference immunity. Suitable for harsh industrial sites in thermal‑power, oil‑gas, chemical and metallurgical industries, it supports 7×24‑hour uninterrupted steady‑state unit operation. It is a general‑purpose core spare part for new‑equipment matching, aged‑probe replacement and monitoring‑system retrofit.
2. Functions and Working Principle
Core Functions: As a non‑contact eddy‑current sensor probe, it realizes high‑precision acquisition of dynamic and static parameters of large rotating metal shafts. 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.
It captures micron‑level tiny run‑out, axial offset and dynamic deformation of rotors in real time, and linearly converts mechanical‑gap displacement into standard analog‑voltage signals transmitted to proximitors and downstream monitoring systems. It provides high‑precision raw data for unit vibration‑trend analysis, early‑fault prediction, rotor‑stator rubbing inspection, shaft‑displacement‑over‑limit interlock and equipment condition early‑warning, and effectively mitigates risks such as shaft‑system wear, equipment failure shutdown and unit safety incidents.
Working Principle: The matched 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 of eddy currents vary linearly with the gap distance between probe and rotor, further changing the equivalent impedance and oscillation amplitude of the probe coil.
The system accurately collects impedance variation and converts it into linear analog‑voltage output. Gap distance and output voltage maintain a standard linear correlation to achieve precise calculation and measurement of displacement and vibration parameters. The whole process involves no physical contact or mechanical wear, adapting to continuous‑operation conditions of high‑speed rotors. Cooperated with proximitors, it performs self‑diagnosis for circuit open‑circuit, short‑circuit, excessive mounting gap and signal faults, ensuring continuous, authentic, stable and reliable monitoring data.
3. Technical Features
Precise Measurement with Standard 8 mm Probe: Adopting industry‑common 8 mm monitoring specification, it has rated sensitivity of 7.87 V/mm (200 mV/mil) and standard linear range of 2 mm with extremely low full‑span linear error. It accurately captures micron‑level vibration and displacement variations of rotors and fully meets accuracy requirements of API 670 industrial monitoring.
Non‑contact Non‑destructive Monitoring: Based on eddy‑current‑induction principle for non‑contact measurement, there is no physical friction or mechanical loss between probe and measured rotor. It enables long‑term stable monitoring of shaft‑system parameters of high‑speed running units and greatly reduces equipment‑maintenance cost and shutdown loss.
Strong Adaptability to Harsh Working Conditions: Made of industrial‑grade temperature‑resistant material with standard wide operating‑temperature range, it withstands complex on‑site conditions including high temperature, oil contamination, dust and humidity. Its cable features anti‑aging and corrosion‑resistant performance for long‑term uninterrupted unit operation.
Full‑shield Anti‑interference Design: Equipped with original tri‑axial full‑shield dedicated cable, it effectively suppresses on‑site electromagnetic radiation, power‑frequency interference and ground‑loop crosstalk, eliminates signal jitter, drift and distortion, and delivers outstanding signal‑transmission stability under harsh conditions.
Convenient and Universal Mounting Compatibility: Featuring M12×1 standard mounting thread and 2.0 m standard‑length cable, it fits most unit measuring‑point brackets and on‑site cabling requirements. It provides simple commissioning, convenient configuration and high universality.
- Full‑dimension Fault Self‑diagnosis: Linked with matched proximitors, it realizes automatic detection and alarm for probe open‑circuit, short‑circuit, excessive mounting gap and signal anomalies. It quickly locates circuit faults, lowers maintenance‑troubleshooting difficulty and ensures reliable commissioning of monitoring systems.
4. Specifications
Basic Parameters
Product Model: 330101‑00‑08‑20‑12‑05 Brand‑Manufacturer: Bently Nevada (Baker Hughes) Product Type: 3300 XL 8 mm Standard Eddy‑current Displacement 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: 00=Non‑armored; 08=Probe diameter 8 mm; 20=Cable length 2.0 m; 12=M12×1 thread; 05=Standard configuration 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
Mechanical‑dimension Parameters
Probe Specification: 8 mm standard monitoring probe Mounting Thread: M12×1 standard metric mounting thread Cable Length: 2.0 m original‑equipment standard tri‑axial shielded cable Structural Characteristics: Non‑armored standard structure, flame‑retardant shielded cable, corrosion‑resistant and anti‑aging housing Ingress‑protection Rating: Industrial IP67, suitable for on‑site dust‑proof and water‑proof conditions
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
5. Application Scenarios
Bently Nevada 330101‑00‑08‑20‑12‑05 probe is widely applied in on‑line condition‑monitoring systems for large‑scale rotating machinery across thermal‑power, gas‑power generation, petroleum‑refining, coal‑chemical, oil‑gas storage‑transportation and heavy‑metallurgy industries.
Typical application scenarios include: on‑line monitoring of shaft radial vibration and axial displacement for steam‑turbine generator sets and gas‑turbine units; rotor‑condition monitoring of large‑scale centrifugal / screw compressor units; shaft‑system vibration monitoring of large‑industrial induced‑draft fans, forced‑draft fans, booster pumps and circulating pumps; real‑time monitoring of rotor eccentricity and thermal‑expansion difference; precise acquisition of equipment key‑phasor speed signals; condition monitoring and anomaly early‑warning during unit start‑stop; early‑fault diagnosis and trend analysis for rotating equipment; replacement and retrofit matching of probes for legacy monitoring systems.
As a universal standard probe of Bently Nevada 3300 XL series, it features high precision, high stability, long service life and maintenance‑free performance. It accurately captures early minor hidden faults of shaft systems and provides core‑data support for condition‑based equipment maintenance, safety interlock protection and safe‑efficient unit operation. It is a key original spare part for maintenance, new installation and retrofit of condition‑monitoring systems for critical industrial rotating equipment.
