Description
Bently Nevada PN330500 Velomitor – Reliable piezo-velocity sensor for machine casing vibration
The Bently Nevada PN330500, commonly known as the 330500 Velomitor, is a piezoelectric velocity transducer designed for continuous casing vibration measurements on pumps, compressors, fans, and general rotating equipment. From my experience, it’s a straightforward, rugged pick when you need stable velocity data to feed protection systems like the 3500 series or for trending in condition monitoring software. You might notice that it drops clean, dynamic velocity output without the fuss—exactly what maintenance teams expect in day‑to‑day reliability programs.
One thing I appreciate is how the 330500 balances durability with signal quality. In many cases it seems to be less sensitive to installation quirks than older moving‑coil velocity probes, yet it still holds up in tough industrial environments. Typical use cases include casing measurements at drive-end and non-drive-end locations, verification of balance jobs, and establishing velocity alarms for ISO 10816/20816 style assessments. A maintenance lead at a petrochemical site told us they swapped these onto several overhung pumps and immediately got more consistent velocity trends compared to legacy sensors.
Order Placement Process and Guarantees
- Warranty: 365 days
- Delivery: 1 week for in‑stock items; no more than one month at the latest
- Payment: 50% advance payment; full payment prior to delivery
- Express options: FedEx, UPS, DHL
Key Features
- Piezo‑velocity measurement – Provides dynamic voltage proportional to velocity for direct mm/s or in/s readings.
- IEPE (ICP‑type) powering – Simplifies wiring; works with standard constant‑current power from most vibration monitors.
- Rugged, field‑proven design – Typically stainless housing and sealed construction for reliability on pumps, motors, and fans.
- Stable sensitivity – Commonly 20 mV/mm/s (≈500 mV/in/s) for consistent trending and threshold setting.
- Broad frequency response – Suits general machinery casing measurements including unbalance, misalignment, and looseness signatures.
- Stud‑mount installation – Standard 1/4‑28 UNF or adapter options help ensure good mechanical coupling.
- Compatible with Bently Nevada monitors – Pairs nicely with 3500/42M, 1900/27 and many third‑party IEPE inputs.
- Hazardous area variants available – XA versions (separate model codes) are used when approvals are required.
Technical Specifications
| Brand / Model | Bently Nevada PN330500 (330500 Velomitor) |
| HS Code | 9031.80 (Measuring/monitoring instruments, not elsewhere specified) |
| Power Requirements | IEPE constant current supply, typically 2–10 mA with ~18–28 V compliance |
| Sensitivity | Typically 20 mV/mm/s (≈500 mV/in/s) |
| Frequency Response | Approx. 4.5 Hz to 5 kHz (sensor‑dependent, within usable tolerance) |
| Signal I/O | Dynamic AC voltage output proportional to velocity (IEPE) |
| Communication Interfaces | Analog IEPE via coax or two‑wire lead (monitor dependent) |
| Installation Method | Stud‑mount to machine casing; common 1/4‑28 UNF thread (adapters available) |
| Dimensions & Weight | Compact stud‑mount form factor; typically under 200 g (exact values vary by suffix) |
| Operating Temperature | Typically −54 °C to +100 °C (check specific suffix for exact rating) |
Related and Supporting Products
- Bently Nevada 330525 Velomitor XA – Similar velocity concept with hazardous area approvals; often selected for Zone/Division classified locations.
- Bently Nevada 3500/42M – Proximitor/Seismic Monitor module that accepts IEPE velocity inputs for protection and trending.
- Bently Nevada 1900/27 – Compact monitor for essential machinery; suitable for IEPE sensors where a smaller footprint is needed.
- Mounting studs/adapters – 1/4‑28 UNF studs, M8 adapters, and magnetic bases (for temporary checks) to ensure proper mechanical coupling.
- Armored or high‑temperature cables – For routing in harsh environments or near hot casings.
Installation & Maintenance
- Mounting surface – Use a flat, clean, and rigid spot on the machine casing; avoid paint under the stud. Torque to manufacturer guidance for repeatable coupling.
- Panel/cabinet considerations – When wiring to monitors in a panel, provide ventilation and keep sensor cabling away from high‑power lines to reduce noise pickup.
- Wiring – IEPE constant‑current power required. Use shielded coax or twisted pair per the monitor’s recommendations; ground/shield at one end to minimize ground loops.
- Safety – For hazardous areas, select the correct XA/approved variant and barriers as specified. De‑energize the circuit before installation or service.
- Routine care – Periodically verify cable integrity, connector tightness, and mounting torque. Trending checks and occasional cross‑check with a handheld meter help confirm sensitivity is within expected tolerance.
- Calibration – Annual calibration is typical in many plants; align calibration intervals with your site’s QA or reliability program.
Quality & Certifications
- CE compliance and RoHS conformance typically available for standard variants.
- Hazardous area approvals (ATEX/IECEx/CSA) available on XA versions (separate ordering codes).
- Manufacturer warranty is typically 1 year; we support with a 365‑day warranty as part of our supply guarantee.
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