Bently Nevada 330851-02-000-060-10-00-00: Proximity Probe Assembly for Machinery Position and Vibration Monitoring

Product Description

The Bently Nevada 330851-02-000-060-10-00-00 is a high-precision proximity probe assembly, a fundamental component of machinery protection and condition monitoring systems. Designed to measure the position, vibration, and speed of rotating machinery components, this assembly uses electromagnetic induction to detect the distance between the probe tip and a target metal surface (e.g., a shaft). It provides accurate, real-time data essential for early fault detection, including unbalance, misalignment, and bearing wear, making it critical for safeguarding critical industrial assets such as 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	60 mm (2.36 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 330851-02-000-060-10-00-00 belongs to the Bently Nevada 3300 series of proximity measurement solutions. The 3300 series includes a range of probes, cables, and signal conditioners designed for precise position, vibration, and speed monitoring of rotating machinery. Renowned for accuracy, durability, and compatibility with Bently Nevada’s 3500 and other monitoring systems, the series is widely adopted in industries such as power generation, oil & gas, and chemical processing. The 330851 model enhances the series by offering a compact 2 mm probe design, ideal for applications with space constraints.

Features

High-Precision Measurement

A sensitivity of 8 V/mm and linear range of 0–2 mm ensure accurate detection of small shaft movements, critical for identifying early signs of machinery imbalance or misalignment.

Rugged Construction

Tungsten carbide probe tip and 316 stainless steel body resist wear, corrosion, and high temperatures, ensuring reliable performance in harsh environments such as 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.

Wide Temperature Range

Operation from -30°C to +121°C enables deployment in extreme temperature environments, including turbine enclosures and high-heat process areas.

Easy Integration

Compatible with Bently Nevada 3500 system modules and other industry-standard signal conditioners, facilitating seamless integration into existing machinery protection systems.

Function

The primary function of the 330851-02-000-060-10-00-00 is to convert mechanical motion (position, vibration) of rotating machinery into electrical signals. When energized, the probe generates an alternating electromagnetic field. As the target shaft moves relative to the probe tip, the eddy currents induced in the shaft change, altering the probe’s impedance. This change is converted into a DC voltage output (-2 VDC to -10 VDC), where the voltage is proportional to the distance between the probe tip and the shaft. Monitoring systems analyze this voltage to derive position, vibration amplitude, and speed data, enabling fault detection and condition assessment.

Use

In industrial settings, the probe is mounted near rotating shafts (e.g., turbine rotors, compressor shafts) using 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 (e.g., thrust bearing wear), vibration levels, and rotational speed, 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 boiler feed pumps, detecting rotor instability and bearing degradation to ensure reliable electricity production.

Oil and Gas

Measures vibration and axial position in centrifugal compressors, pipeline pumps, and gas turbines, supporting safe and efficient hydrocarbon production, transportation, and refining.

Chemical Processing

Tracks shaft movement 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 330851-02-000-060-10-00-00 proximity probe assembly is a critical tool for machinery condition monitoring. Its precision, durability, and seamless integration with monitoring systems make it essential for industries seeking to protect critical rotating assets, optimize maintenance, and ensure operational efficiency.