Description
1. Product Introduction
The Bently Nevada 330104‑00‑08‑10‑02‑05 is an 8‑mm high‑precision armoured eddy‑current displacement‑vibration sensor of the 3300 XL series. Fully compliant with the API 670 international rotating‑machinery‑protection standard and high‑grade industrial EMC specifications, it serves as an original core sensing hardware for condition‑monitoring and safety‑protection systems of large rotating power equipment.
This model adopts a custom‑built 8 mm unthreaded short‑probe structure, fitted with standard armoured protective cable of 5‑metre length. Designed for high‑speed rotating machinery with compact installation space, complicated wiring and harsh operating conditions, it is widely applicable to major industrial rotary equipment such as steam turbines, gas turbines, centrifugal compressors, large‑size fans and pumps. Based on the mature non‑contact eddy‑current measuring principle with zero physical‑contact wear, the sensor enables long‑term stable acquisition of critical operating parameters, including radial shaft vibration, axial displacement, shaft eccentricity and key‑phase speed. Constructed with a reinforced stainless‑steel housing, fully‑armoured abrasion‑resistant and corrosion‑proof structure and high‑temperature anti‑ageing industrial materials, it features high‑measurement accuracy, excellent linearity, low‑temperature drift, strong tension‑shock resistance and superior electromagnetic‑interference immunity. It reliably withstands harsh conditions in power‑equipment rooms: high temperature & humidity, oil‑gas dust, continuous mechanical vibration and intense frequency‑converter electromagnetic interference, supporting 7×24‑hour non‑stop on‑line monitoring. It is suitable for new‑build monitoring‑system configuration, original‑equipment replacement of legacy sensors, monitoring‑accuracy upgrades and predictive‑maintenance retrofits across power, petrochemical, coal‑chemical, heavy‑industry and other sectors.
2. Functions and Working Principle
Core Functions
The 330104‑00‑08‑10‑02‑05 integrates six core capabilities: dynamic vibration monitoring of large rotating units, high‑precision static axial‑displacement measurement, shaft‑eccentricity deformation detection, key‑phase speed‑signal acquisition, filtered transmission of process signals under complex industrial conditions and early‑warning diagnosis of equipment anomalies. It fully satisfies full‑dimensional data‑acquisition requirements for condition monitoring, fault diagnosis and safety interlock protection of high‑speed heavy‑duty rotating machinery.
It captures micron‑level radial‑vibration amplitudes, axial‑displacement offsets and shaft‑deviation values of high‑speed rotors in real‑time, collects full‑time dynamic operating data, and linearly converts mechanical physical‑displacement variables into a standard DC analog‑voltage signal for stable upload to Bently 3300 and 3500 monitoring systems. It supplies high‑precision, highly‑continuous and high‑fidelity data support for hidden‑fault diagnosis, trend analysis and interlock trip protection against excessive vibration, over‑limit axial displacement, rotor‑stator rub, rotor unbalance, bearing failure and other hazards.
Built‑in multi‑stage signal‑filtering and anti‑interference mechanisms effectively eliminate signal distortion and data jitter triggered by on‑site frequency‑converter interference, electromagnetic noise, mechanical resonance and line crosstalk, ensuring complete signal fidelity throughout monitoring and substantially improving operational‑safety levels and fault‑prediction accuracy for rotating equipment.
Working Principle
This sensor operates based on the principle of high‑frequency non‑contact eddy‑current induction measurement, and must be used together with an original Bently proximitor to form a fully closed‑loop monitoring system. When high‑frequency alternating current flows through the precision coil inside the probe, a stable high‑frequency alternating magnetic‑field is generated at the probe tip. As the metallic rotor target enters the magnetic‑field induction zone, closed eddy currents are induced on the metal surface.
The intensity and distribution density of eddy currents vary dynamically according to the gap distance between probe and target, which in turn inversely changes electrical parameters including impedance, inductance and output voltage of the probe coil. The sensor detects these tiny electrical variations and converts physical variables such as gap distance, vibration displacement and deformation offset into a proportional standard DC‑voltage signal by means of factory‑calibrated linear‑conversion algorithms.
The entire measuring process is contact‑free and friction‑free, offering fast‑response speed and a stable linear range. Both steady‑state static‑displacement monitoring and high‑frequency dynamic‑vibration acquisition can be performed simultaneously. Combined with the backend monitoring platform, it enables real‑time shaft‑condition tracking, trend logging, over‑limit alarming and interlock trip protection, ensuring controllable, stable, safe and compliant long‑term operation of large rotating power‑machinery.
3. Technical Features
- Custom‑built 8 mm short unthreaded specification for compact measuring‑points: Built around a standard 8‑mm probe body with an 8 mm custom‑unthreaded short section, it is specially designed for narrow and compact installation spaces. Fully compatible with the complete 3300 XL proximitor range and the 3500 monitoring system, replacement installation requires no rewiring or modification of monitoring logic, suiting measuring‑point layouts of major rotating assets across multiple industries.
- Ultra‑high measurement accuracy and excellent long‑term linear stability: Equipped with factory‑wound precision coils and calibrated at manufacture, it delivers a nominal sensitivity of 7.87 V/mm, minimal full‑range linear error and low‑temperature drift. Micron‑scale vibration and displacement changes on rotating shafts are captured precisely, eliminating missed or false fault judgements caused by measurement deviation with zero‑parameter drift and zero‑accuracy degradation during long‑term continuous runtime.
- Armoured reinforced structure providing outstanding mechanical protection: The fully‑armoured abrasion‑resistant cable and reinforced stainless‑steel housing deliver excellent resistance to tension, crushing, mechanical shock, oil‑gas and corrosion. Compared with standard‑cable sensors, it performs far better under complex wiring layouts and equipment‑vibration shock conditions in plant rooms and significantly extends service life and damage resistance.
- Non‑contact loss‑free measurement for maintenance‑free long service life: Contact‑free inductive sensing removes physical friction between probe and rotor, fundamentally preventing accuracy degradation and component ageing common with contact‑type sensors, and supporting continuous non‑stop operation of high‑speed rotating equipment.
- Superior anti‑interference performance for wide‑ranging harsh‑condition adaptability: The full‑shielded electromagnetic‑protection design has passed high‑grade EMC compliance testing for power and petrochemical sectors. It effectively resists intense electromagnetic radiation, frequency‑converter interference, line crosstalk and mechanical resonance, delivering stable, distortion‑free and jitter‑free signal transmission under adverse site conditions.
- Wide‑temperature corrosion‑resistant construction and convenient, efficient maintenance: Probe and cable are fabricated from high‑temperature‑ and oil‑gas‑corrosion‑resistant industrial materials for stable operation across a broad temperature band, tolerating high temperature, humidity, oil‑gas dust and persistent vibration. The purely‑passive hardware unit requires no routine calibration or frequent servicing; only periodic inspection is needed. Fault‑location and quick‑swap replacement reduce overall machinery‑maintenance costs and downtime losses.
4. Specifications
Basic Parameters
Product Model: 330104‑00‑08‑10‑02‑05 Brand & Manufacturer: Bently Nevada Product Series: 3300 XL 8 mm Eddy‑Current Sensor Series Applicable System: Bently 3300 / 3500 Rotating‑Machinery Condition‑Monitoring & Protection System Product Type: Short‑probe armoured non‑contact shaft‑vibration and axial‑displacement monitoring sensor Structural Specification: 8 mm unthreaded probe length, standard armoured cable, 5‑metre cable length, conventional connector configuration Applicable Standards: API 670 Machinery‑Protection Standard, IEC Industrial‑EMC Standard, Bently‑Nevada factory precision‑measurement specifications Primary Purpose: Radial shaft‑vibration, axial‑displacement, shaft‑eccentricity and key‑phase speed monitoring for rotating units; fault diagnosis, process‑data acquisition, safety interlock protection and data support for predictive maintenance
Core‑Performance Parameters
Operating Principle: High‑frequency eddy‑current induction measurement, dual‑mode monitoring for dynamic vibration + static displacement Probe Specification: Standard 8‑mm measuring probe, unthreaded length 8 mm Nominal Sensitivity: 7.87 V/mm (200 mV/mil) Linear Measurement Range: 0.25 mm ~ 2.3 mm (10 ~ 90 mils) Recommended Installation Gap: 1.27 mm (50 mils) Frequency Response: 0 Hz ~ 10 kHz, supporting high‑precision high‑frequency vibration‑signal acquisition for machinery Linearity Accuracy: Full‑range linear error ≤ 1 %, zero‑parameter drift and zero‑accuracy degradation over long‑term operation Output Signal: Standard DC analog‑voltage signal for high‑precision system acquisition and interpretation
Electrical Parameters
Power Supply: Powered via original proximitor, −17.5 VDC ~ −26 VDC Maximum Operating Current: 12 mA Immunity Grade: High‑level EMI/RFI electromagnetic shielding against industrial high‑frequency interference Measurement Characteristics: Dual‑mode high‑precision output for high‑frequency dynamic‑vibration acquisition and steady‑state static‑displacement measurement
Mechanical & Physical Parameters
Structural Features: 8 mm short unthreaded‑probe design, reinforced stainless‑steel housing, fully‑armoured abrasion‑corrosion‑resistant shielded cable, 5‑metre standard cable length, anti‑vibration reinforced construction Mounting Method: Bracket‑fixed installation, compatible with narrow compact measuring‑points and various machinery layouts Maintenance Characteristics: No routine calibration or frequent maintenance required; clear fault identification enabling fast‑swap servicing
Environmental Parameters
Probe Operating Temperature: −52 ℃ ~ +177 ℃ Cable Operating Temperature: −52 ℃ ~ +177 ℃ Storage Temperature: −60 ℃ ~ +200 ℃ Relative Humidity: 5 %‑95 % RH, non‑condensing Environmental Resistance: Immunity to strong electromagnetic interference and mechanical tension‑shock; oil‑gas‑corrosion‑resistant, high‑temperature‑humidity‑resistant, dust‑proof and anti‑vibration, suitable for 7×24‑hour continuous on‑line monitoring of industrial equipment
5. Application Scenarios
The Bently Nevada 330104‑00‑08‑10‑02‑05 sensor is widely deployed in condition‑monitoring systems for high‑speed heavy‑duty rotating power‑machinery at thermal‑power plants, gas‑fired combined‑cycle stations, combined‑heat‑and‑power facilities, petrochemical sites, coal‑chemical complexes, large‑scale heavy‑industry captive‑power stations and oil‑gas transmission terminals. It constitutes the core armoured sensing hardware for fault prediction, safety interlock protection and stable‑operation maintenance of large rotating equipment under compact measuring‑point conditions.
Typical applications include round‑the‑clock shaft‑vibration and axial‑displacement monitoring at compact measuring‑points on turbo‑generator sets; high‑precision shaft‑eccentricity deformation and key‑phase speed acquisition on gas turbines within narrow spaces; condition monitoring of large centrifugal and screw compressors; dynamic‑parameter acquisition for large‑scale industrial induced‑draught fans, forced‑draught fans and circulating‑water pumps; monitoring‑point hardware fitted for confined‑space locations; original‑equipment replacement of short‑probe armoured sensors on legacy machinery; accuracy‑upgrade retrofits of rotating‑machinery monitoring systems; unattended on‑line monitoring of high‑risk power assets; vibration‑anomaly fault diagnosis and trend analysis; compliance‑monitoring hardware for industrial rotating equipment; and data acquisition for predictive maintenance of power‑generating machinery.
As an 8‑mm short unthreaded, 5‑metre‑cable armoured high‑precision eddy‑current sensor from the 3300 XL family, it delivers key advantages: compact‑space installation capability, high‑precision short‑probe acquisition, damage‑resistant armoured construction, non‑contact loss‑free measurement, ultra‑high accuracy, stable wide‑temperature operation, robust interference‑resistant signal transmission and long‑term maintenance‑free service. It addresses well‑known industry‑wide weaknesses of conventional sensors: poor measuring‑point adaptability, fragile mechanical construction, precision drift and signal susceptibility to noise. It mitigates risks of unplanned shutdown, component damage and safety incidents caused by shaft rub, rotor unbalance, bearing failure, over‑limit displacement and other defects, and comprehensively guarantees long‑term safe, stable, efficient and compliant operation of large rotating power‑machinery. It is the preferred original‑equipment core sensor for new‑system deployment, legacy‑system retrofits and fault‑repair maintenance projects of industrial rotating‑machinery condition‑monitoring systems.
