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The 330500-02-02 is a Velomitor piezoelectric speed sensor manufactured by Bentley Nevada, USA. As a core sensing element in rotating machinery condition monitoring systems, this sensor is mainly used for precision measurement of the absolute vibration velocity of machine housings, bearing housings, or structural components.
Solid-state electronics and piezoelectric crystal structures
High electromagnetic interference (EMI) isolation capabilities
Capable of withstanding and accurately measuring intense industrial vibration shocks
Bently Nevada Velomitor Piezo-velocity Sensors are designed to measure absolute (relative to free space) bearing housing, casing, or structural vibration. The 330500 is a specialized piezoelectric accelerometer that incorporates embedded integrated electronics in a solid-state design. Because the 330500 incorporates solid-state electronics and has no moving parts, it does not suffer from mechanical degradation and wear, and can be mounted vertically, horizontally, or at any other angle of orientation. Its specialized internal shielding isolates the sensing element from electrostatic noise and electromagnetic interference (EMI) commonly found in power plants and petrochemical facilities. Furthermore, as part of Bently Nevada’s standardized sensor family, it offers complete interchangeability with matching cables and monitors, allowing field technicians to replace units quickly without complex recalibrations. This combination of rugged durability and seamless plug-and-play operation ensures minimal downtime and maximum operational safety for your critical plant assets.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Bently Nevada 330500-02-02 Velomitor Piezo-velocity Sensor Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Oil and Gas Exploration
Used to measure the absolute casing vibration of large crude oil transfer pumps and water injection pumps on offshore drilling platforms and onshore oilfields to prevent sudden mechanical catastrophic failures.
Petrochemical and Refining
Leveraging its ATEX/IECEx explosion-proof compliance, it is safely installed on critical hydrocracking compressors and ethylene charge gas compressors in refineries to monitor bearing housing casing vibration in real time.
Thermal Power Generation
Deployed on boiler feedwater pumps, forced draft fans, and induced draft fans in coal-fired or gas-fired power plants to identify severe machinery unbalance or misalignment by capturing absolute casing velocity signals.
Nuclear Power Generation
Used to monitor the mechanical casing vibration of various auxiliary pumps, cooling water circulation pumps, and large ventilation systems within the conventional island of nuclear power plants to ensure uninterrupted grid safety.
Hydroelectric Power Generation
Installed on the upper bearing housings of hydro-generator units and horizontal synchronous condensers to capture low-to-medium frequency casing vibrations caused by hydraulic unbalance or mechanical wear.
When using the 330500-02-02, the M8 threaded base must be tightened onto a flat metal surface strictly adhering to the official torque limit of 4.5 N·m; over-tightening can fracture the internal crystals, while under-tightening causes signal distortion. For electrical connections, original two-wire shielded cables must be utilized with the shield grounded at a single point on the monitor side to ensure high electromagnetic interference (EMI) isolation capabilities. Furthermore, never operate the unit outside its temperature parameters of -40°C to +121°C or beyond its dynamic capacity of 127 mm/s peak, and dedicated safety barriers are mandatory when deploying it within explosive hazardous areas.
The specific configuration 330500-02-02 features an M8 x 1.25 mounting thread base and carries multiple hazardous area approvals (ATEX/IECEx), making it ideal for international projects and explosive environments. Delivering a standard sensitivity of 3.94 mV/mm/s (100 mV/in/s) over a broad frequency range of 4.5 Hz to 5,000 Hz, this sensor provides exceptional signal stability and accuracy. Equipped with a top-mounted 2-pin MIL-C-5015 connector, the 330500-02-02 integrates seamlessly with Bently Nevada’s flagship 3500 Machinery Protection System, offering robust, low-maintenance, and continuous casing vibration monitoring for critical rotating machinery like pumps, compressors, and fans.
The 330500-02-02 is a 330500 Velomitor Piezoelectric Velocity Sensor manufactured by Bently Nevada. It is a casing vibration sensor specifically designed to measure the absolute vibration velocity of rotating machinery casings, such as pumps, fans, and compressors.
What is the working principle of the 330500-02-02?
It utilizes an internal piezoelectric ceramic crystal combined with an embedded charge amplifier circuit. Mechanical vibration exerts varying force on the crystal to generate charge, which is converted and integrated internally to output a signal proportional to vibration velocity.
How is the 330500-02-02 typically installed physically?
The sensor is mounted directly onto a flat, drilled, and tapped surface on the bearing housing or casing (in vertical, horizontal, or axial directions) using its base M8 x 1.25 thread, tightened to strict official torque specifications.
What type of output signal does the 330500-02-02 sensor provide?
It utilizes a 2-wire loop-powered design that outputs an AC voltage signal. Its standard sensitivity is 3.94 mV/mm/s (100 mV/in/s), with the dynamic signal superimposed on a DC bias voltage.
Does the 330500-02-02 require periodic bench calibration?
Yes. To ensure measurement accuracy, it is generally recommended to remove the 330500-02-02 sensor every 1 to 2 years for recalibration of its sensitivity and frequency response using a standard vibration shaker table.
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