Bently Nevada 330851-02-000-030-10-00-05: Precision Proximity Probe Assembly for Machinery Monitoring

Product Description

The Bently Nevada 330851-02-000-030-10-00-05 is a high-precision eddy-current proximity probe assembly, a core component of machinery protection and condition monitoring systems. Designed to measure shaft displacement, vibration, and position in rotating machinery, this assembly uses electromagnetic induction to detect the distance between the probe tip and a target metal surface (e.g., a rotating shaft). It delivers accurate, real-time data critical for early detection of faults such as unbalance, misalignment, and bearing degradation, making it essential for safeguarding critical industrial assets like turbines, compressors, and pumps.

Product Parameters

Parameter	Specification
Probe Type	Eddy-current proximity probe, 2 mm diameter tip
Measurement Range (Linear)	0–2 mm (0–80 mils)
Probe Length	30 mm (1.18 inches)
Cable Length	10 meters (32.8 feet)
Output Voltage Range	-2 VDC to -10 VDC (proportional to target distance)
Sensitivity	8 V/mm ± 0.5 V/mm (200 V/inch ± 12.5 V/inch)
Frequency Response	0 Hz to 10 kHz
Operating Temperature	-30°C to +121°C (-22°F to +250°F)

Product Specifications

Series

The 330851-02-000-030-10-00-05 belongs to the Bently Nevada 3300 series of proximity measurement solutions. The 3300 series includes a comprehensive range of probes, extension cables, and signal conditioners engineered for precise position, vibration, and speed monitoring of rotating machinery. Renowned for accuracy, durability, and compatibility with Bently Nevada’s 3500 and 1900 monitoring systems, the series is widely adopted in industries such as power generation, oil & gas, and chemical processing. This specific model enhances the series by offering a compact 30 mm probe length, ideal for applications with tight space constraints.

Features

High-Precision Measurement

A linear range of 0–2 mm and sensitivity of 8 V/mm ensure accurate detection of 微小轴位移 (small shaft movements), critical for identifying early signs of machinery imbalance, misalignment, or bearing wear.

Rugged Industrial Design

Tungsten carbide probe tip and 316 stainless steel body resist corrosion, abrasion, and high temperatures, ensuring reliability in harsh environments like refineries and power plants.

Low-Noise Signal Transmission

Triaxial shielded cable minimizes electromagnetic interference (EMI) and radio frequency interference (RFI), ensuring clean signal delivery to monitoring systems even in electrically noisy industrial settings.

Space-Saving Probe Length

30 mm probe length enables installation in tight spaces (e.g., between bearing housings or in compact machinery), expanding application versatility.

Seamless System Integration

Compatible with Bently Nevada 3500 and 3300 series monitoring modules, facilitating easy integration into existing machinery protection setups.

Function

The primary function of the 330851-02-000-030-10-00-05 is to measure the position, vibration, and relative movement of rotating machinery shafts. When energized, the probe generates an alternating electromagnetic field. As the target shaft moves relative to the probe tip, eddy currents induced in the shaft change, altering the probe’s impedance. This change is converted into a proportional voltage signal (-2 VDC to -10 VDC), where voltage magnitude corresponds to the distance between the probe tip and the shaft. Monitoring systems analyze this signal to derive key metrics (e.g., vibration amplitude, shaft position), enabling early fault detection and condition assessment.

Use

In industrial settings, the probe is mounted near rotating shafts (e.g., turbine rotors, compressor shafts) using M8 threaded fittings, with the tip positioned 1 mm from the shaft surface (within the linear range). The 10-meter cable connects the probe to a signal conditioner or 3500 system module, which processes the raw voltage signal into actionable data. Operators use this data to monitor shaft position and vibration in real time, while maintenance teams leverage trends to schedule proactive repairs, preventing unplanned downtime.

Application Fields

Power Generation

Monitors shaft vibration and position in steam/gas turbines, generators, and feedwater pumps, detecting rotor instability and bearing degradation to ensure continuous electricity production.

Oil and Gas

Measures axial and radial shaft movement in centrifugal compressors, pipeline pumps, and gas turbines, supporting safe and efficient hydrocarbon production, transportation, and refining.

Chemical Processing

Tracks shaft displacement in agitators, mixers, and reactor pumps, ensuring equipment alignment and preventing seal failures that could lead to hazardous material leaks.

Pulp and Paper

Monitors roller vibration and position in paper machines, detecting misalignment or bearing wear to maintain product quality and reduce production waste.

Mining and Metals

Monitors crusher and conveyor motor shafts, providing early warning of imbalance or bearing failure to minimize downtime in rugged mining operations.

In summary, the Bently Nevada 330851-02-000-030-10-00-05 proximity probe assembly is a critical tool for machinery condition monitoring. Its precision, compact design, and rugged construction make it essential for industries seeking to protect critical rotating assets, optimize maintenance, and ensure operational efficiency.