Brand: Bently Nevada

Bently Nevada 330500 Velomitor Piezo-Velocity Sensor

Name: Bently Nevada 330500 Velomitor Sensor – Manual & Price Quote
Brand: Bently Nevada

Description

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.

Backed by manufacturer datasheet documentation, 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 can source Bently Nevada sensors through Seven Star LLC, with application engineering support and lead time confirmed at quotation, to keep machinery protection and condition monitoring systems fully populated.

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.

Working closely with plant engineers in the region, 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.

Parameter	Specification
Model	Bently Nevada 330500 Velomitor
Sensor Type	Integrating piezo-accelerometer (velocity output)
Sensitivity	3.94 mV/mm/s (100 mV/in/s) ±5%
Frequency Range	4.5 Hz to 5 kHz ±3.0 dB; 6.0 Hz to 2.5 kHz ±0.9 dB
Connector	2-pin polarized industrial connector
Maximum Cable Length	305 m (1,000 ft)
Mounting Orientation	Vertical, horizontal, or any angle
Housing Material	Rugged stainless steel
Hazardous Area Approvals	Multiple certifications available for classified area installation
Typical Application	Rolling-element bearing machines — pumps, motors, fans, compressors, gearboxes
Compatible Systems	Bently Nevada 3500 Machinery Protection System and compatible monitors

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. With fast quotation turnaround and technical support, Seven Star LLC supplies vibration sensors and monitoring hardware on request, so that rotating equipment across Muscat, Sohar, Salalah, and the wider Sultanate stays protected with Baker Hughes condition monitoring technology.

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About brand

Bently Nevada is the American machinery protection and condition monitoring brand behind the 3500 rack, the 3300 XL proximity probe and the System 1 software. It was founded in 1961 in Minden, Nevada, and is today a Baker Hughes business.

Seven Star LLC is an independent supplier in Muscat. We list Bently Nevada monitors, I/O modules, probes, proximitors, velocity transducers and transmitters for rotating equipment in Oman and the GCC, and source them by full part number.

Bently Nevada company profile

Established	1961, Minden, Nevada, USA, by Donald E. Bently. The business started earlier as Bently Scientific in Berkeley, California (1956).
Known for	The first commercial eddy-current proximity transducers for measuring shaft vibration and position on high-speed turbomachinery
Ownership	Acquired by GE Energy in 2002; part of Baker Hughes since GE Oil & Gas combined with Baker Hughes in 2017
Rack generations	5000 series (from 1965), 3300 series (from 1988), 3500 series (from 1995), Orbit 60 (current platform)
Product families	Machinery protection racks, proximity probes and proximitors, Keyphasor sensors, velocity and acceleration transducers, 2-wire vibration transmitters, general-purpose monitors, portable analyzers, wireless sensors and System 1 condition monitoring software
Typical machines	Steam and gas turbines, centrifugal and reciprocating compressors, pumps, motors, generators, fans and gearboxes

Milestones

1956: Donald E. Bently starts Bently Scientific in Berkeley, California.
1961: The company moves to Minden, Nevada, as Bently Nevada.
1965: The 5000 series monitoring system is introduced.
1988: The 3300 series follows.
1995: The 3500 machinery protection system is launched.
2002 and 2017: GE Energy acquires Bently Nevada; it becomes part of Baker Hughes in 2017.

Bently Nevada product series

Series	Type	What it does
3500	Machinery protection rack	Continuous online protection with alarm and danger relays. Modules include the 3500/15 power supply, 3500/20 rack interface, 3500/25 Keyphasor, 3500/42M proximitor/seismic, 3500/50 tachometer, 3500/60 temperature, 3500/33 relay and 3500/92 communication gateway
3500 recip modules	Reciprocating compressor monitoring	3500/70M impulse velocity, 3500/72M rod position and 3500/77M cylinder pressure
Orbit 60	Protection and monitoring platform	The current Bently Nevada platform for protection, condition monitoring and data integration with System 1
3300 XL 8 mm	Proximity transducer system	Probe, extension cable and proximitor sensor for radial vibration, thrust position and Keyphasor reference on fluid-film bearing machines; also 5 mm and 25 mm versions
330500 Velomitor, 190501 Velomitor CT	Piezo-velocity sensors	Casing velocity on rolling-element bearing machines and low-speed cooling tower fans
990 and 991	2-wire transmitters	4-20 mA vibration (990) and thrust position (991) signals straight into a PLC or DCS, without a monitor rack
1900/65A, 2300	Compact monitors	Protection for balance-of-plant pumps, fans and motors where a full 3500 rack is not justified

A proximity probe measures the gap to the shaft, so it sees shaft movement inside a fluid-film bearing directly. A velocity or acceleration sensor sits on the casing and suits rolling-element bearing machines. Critical turbomachinery usually carries two X-Y probes per bearing, two axial probes for thrust position and a Keyphasor probe for speed and phase.

Where Bently Nevada systems are used

In Oman and the GCC, Bently Nevada racks and probes protect gas turbines, compressors and steam turbines in gas processing, LNG, refining, petrochemical, power and desalination plants. Many installations are 3500 racks that have run for years, so most requests are for like-for-like module, probe, extension cable and proximitor replacements, plus upgrades to newer monitors.

Ordering and replacement: what we need

For probes and proximitors, send the full part number with all option digits (for example 330101-00-27-10-02-05). The digits set the probe length, cable length, connector and approvals, and the probe, cable and proximitor must match in total system length. For 3500 modules, send the module and I/O part numbers from the rack and say whether the I/O is internal or external termination, or barrier type. If a module is obsolete, we quote the replacement that Bently Nevada names and point out any configuration or firmware change.

Facts checked against Baker Hughes Bently Nevada pages and published company history, October 2026.

Browse Bently Nevada products by category: Vibration.

FAQ

Questions about the Bently Nevada 330500 Velomitor Piezo-Velocity Sensor

Answers from our engineering team on installation, compatibility and integration.

01What does the Bently Nevada 330500 measure that a proximity probe does not?

The Bently Nevada 330500 measures absolute casing, bearing housing, or structural vibration in units of velocity, while a proximity probe measures relative shaft displacement. This makes the 330500 the preferred sensor for rolling-element bearing machines such as pumps, motors, fans, and gearboxes where shaft-relative measurement is not applicable.

02Does the 330500 Velomitor require external signal conditioning?

No. The Bently Nevada 330500 has an internal integrating charge amplifier that converts the raw acceleration signal into a velocity output on-board, so it can be wired directly into a Bently Nevada 3500 Machinery Protection System or compatible monitor without external signal-conditioning modules.

03Can the Bently Nevada 330500 be mounted in any orientation?

Yes. The 330500 Velomitor can be mounted vertically, horizontally, or at any intermediate angle without affecting measurement accuracy, which gives engineers flexibility when retrofitting existing machine trains with fixed mounting geometry.

04What cable length and hazardous area options does the 330500 support?

The Bently Nevada 330500 supports cable runs of up to 305 m (1,000 ft) between the sensor and the monitoring rack, and is available with multiple hazardous area approvals for installation in classified petrochemical, offshore, and gas processing plant zones.

05Is Seven Star LLC an experienced supply partner for Bently Nevada products?

Yes, Seven Star LLC is an experienced supplier of Bently Nevada and Baker Hughes condition monitoring products in Oman and the GCC, supplying sensors with local engineering support.