Bently Nevada 330500 Velomitor Piezo-Velocity Sensor

Overview

The Bently Nevada 330500 Velomitor is a rugged, 2-pin, integrating piezo-velocity sensor engineered by Bently Nevada, a Baker Hughes business, for absolute vibration measurement on machines equipped with rolling-element bearings. Unlike proximity probes, which measure relative shaft displacement, the 330500 Velomitor measures absolute casing, bearing housing, or structural vibration directly in units of velocity — the parameter most useful for assessing the health of rolling-element bearings, gearboxes, motors, pumps, and fans. Its solid-state piezoelectric design contains no moving parts, eliminating the mechanical wear and drift that limit older seismic-coil velocity sensors.

As the official authorized partner and exclusive regional representative for Bently Nevada and Baker Hughes condition monitoring products, Seven Star LLC proudly supplies the Bently Nevada 330500 Velomitor to rotating equipment operators across Oman and the GCC. Reliability engineers in Muscat, Sohar, and Salalah depend on Seven Star LLC for genuine Bently Nevada sensors, complete with manufacturer warranty, application engineering support, and locally held stock that keeps machinery protection and condition monitoring systems fully populated without lengthy import lead times.

Measurement Principle

The Bently Nevada 330500 Velomitor uses an internal piezoelectric accelerometer element combined with an integrating charge amplifier circuit housed within the sensor body. As the machine vibrates, the piezo element generates a charge proportional to acceleration; the sensor’s internal electronics mathematically integrate this acceleration signal into a velocity output, delivered as a standard analog voltage proportional to vibration velocity. This on-board integration means the 330500 Velomitor can be wired directly into a Bently Nevada 3500 Machinery Protection System or other monitoring platform without external signal-conditioning modules, simplifying both new installations and retrofits of older seismic-coil velocity pickups.

Because the sensing element is fully solid-state, the 330500 Velomitor has no moving coils, springs, or magnets to wear out, corrode, or lose calibration over time — a critical advantage over legacy electromechanical velocity transducers, which are prone to mechanical fatigue and drift after years of continuous service. The Bently Nevada 330500 delivers a sensitivity of 3.94 mV/mm/s (100 mV/in/s) ±5% across a frequency range of 4.5 Hz to 5 kHz (±3.0 dB), or 6.0 Hz to 2.5 kHz (±0.9 dB) for the tighter tolerance band, giving reliability teams a dependable, drift-free vibration signal for trending and alarm purposes over the life of the machine.

Engineering Design of the Bently Nevada 330500

The Bently Nevada 330500 is built into a compact, rugged, threaded stainless steel housing suited for direct stud-mounting or magnetic-base attachment to bearing housings, casings, and other structural machine surfaces. The sensor connects through a 2-pin polarized connector rated for industrial environments, and its cable can run up to 305 m (1,000 ft) from the sensor to the monitoring rack without signal degradation, allowing electronics enclosures to be located well away from hot, vibrating, or hazardous zones. Multiple hazardous-area approvals are available for the Bently Nevada 330500, permitting installation on rotating equipment inside classified petrochemical, offshore, and gas processing plant zones.

Mounting flexibility is a defining characteristic of the Bently Nevada 330500’s mechanical design: the sensor can be installed vertically, horizontally, or at any intermediate angle without affecting its measurement accuracy, unlike some competing velocity sensors that are orientation-sensitive. This makes the Bently Nevada 330500 well suited to retrofits on existing machine trains where mounting geometry is fixed by the equipment layout. The related 330525 XA variant extends this family with a 316L stainless steel case and weatherproof connector assembly for mounting without a protective housing, while the 330500 remains the standard workhorse choice for general-purpose bearing and casing vibration monitoring.

Key Features

The Bently Nevada 330500 Velomitor piezo-velocity sensor delivers rugged, drift-free vibration monitoring for rolling-element bearing machinery across a wide range of industrial environments.

• Solid-state integrating piezo-accelerometer design eliminates the moving parts and mechanical wear found in legacy seismic-coil velocity sensors.
• The Bently Nevada 330500 delivers a sensitivity of 3.94 mV/mm/s (100 mV/in/s) ±5% for accurate, repeatable velocity output.
• Covers a frequency range from 4.5 Hz to 5 kHz, suitable for rolling-element bearing and gearbox condition monitoring.
• Supports cable runs up to 305 m (1,000 ft) between the sensor and monitoring electronics.
• Mounts vertically, horizontally, or at any angle without loss of measurement accuracy.
• Multiple hazardous-area approvals allow deployment in classified oil, gas, and petrochemical plant zones.
• Integrates directly with Bently Nevada 3500 Machinery Protection Systems and compatible third-party monitoring platforms.
• Rugged 2-pin connector design simplifies field wiring and sensor replacement during planned maintenance.

Industrial Applications

The Bently Nevada 330500 Velomitor is widely deployed on pumps, motors, fans, compressors, gearboxes, and other rotating equipment supported by rolling-element bearings across refining, petrochemical, power generation, and general manufacturing plants. Because it measures absolute casing and bearing housing vibration rather than relative shaft displacement, it complements proximity probe systems on fluid-film bearing machines and serves as the primary vibration sensor on machines where rolling-element bearings make shaft-relative measurement unnecessary. Typical installations include balance-of-plant pumps and motors in power stations, cooling tower fan drives, compressor packages, and auxiliary rotating equipment throughout oil and gas processing facilities.

As the officially authorized partner for Bently Nevada and Baker Hughes, Seven Star LLC distributes the Bently Nevada 330500 Velomitor to reliability and maintenance teams throughout Oman, including the Sohar and Salalah industrial and economic zones, and across the broader GCC. District cooling plants, desalination facilities, and refining and petrochemical complexes in Muscat and beyond rely on Seven Star LLC for genuine Bently Nevada sensors, calibration support, and rapid replacement stock that keeps rotating machinery protection systems fully operational.

Technical Specifications

The table below summarizes the key specifications of the Bently Nevada 330500 Velomitor piezo-velocity sensor.

Request a Quote for Bently Nevada 330500 Velomitor Piezo-Velocity Sensor

To specify the Bently Nevada 330500 Velomitor for a new condition monitoring installation or to replace an aging seismic-coil velocity sensor, contact the Seven Star LLC instrumentation division for a formal RFQ, technical datasheet, and application review. As the authorized partner for Bently Nevada in Oman and the GCC, Seven Star LLC maintains regional warehouse stock of vibration sensors and monitoring hardware, backed by factory-trained engineering support, so that rotating equipment across Muscat, Sohar, Salalah, and the wider Sultanate stays protected with genuine Baker Hughes condition monitoring technology.

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