Description

Bently Nevada 330500-00-20 Piezo-velocity Sensor

Configured for direct mechanical vibration velocity transduction in Bently Nevada 3300/3500 series machinery monitoring architecture, the Bently Nevada 330500-00-20 (330500 Piezo-velocity Sensor) provides direct physical execution of velocity-to-voltage conversion for radial and axial vibration measurement channels.

Technical Summary

The unit operates as a piezoelectric velocity transducer converting casing vibration velocity into proportional electrical signal output. Signal conditioning is based on internal piezo-velocity element response, with output scaling designed for vibration monitoring systems used in rotating machinery protection loops. The device supports long-distance integral cable configuration (20 ft / 6.0 m) without external mounting adapter.

Hardware Specifications

Parameter	Specification
ModelBrand	Bently Nevada 330500-00-20
Origin	USA
Weight	0.16 kg
Dimensions	2.5 x 2.5 x 7.2 cm (shipping size)
OperatingTemp	Not specified
PowerConsumption	Self-powered piezoelectric device (no external excitation)
Sensor Type	Piezo-velocity sensor (Velomitor type)
Sensitivity	3.94 mV/mm/s (100 mV/in/s) ±5%
Velocity Range	1270 mm/s (50 in/s) peak
Transverse Sensitivity	Less than 5% of sensitivity
Cable Length	20 ft / 6.0 m

Cross-Talk Suppression and Signal Integrity Architecture

The Bently Nevada piezo-velocity element design incorporates mechanical isolation geometry to reduce cross-axis coupling effects, maintaining transverse sensitivity below 5%. Signal integrity is maintained through controlled impedance cable architecture and shielded conduction path, minimizing electromagnetic interference pickup in dense machinery monitoring environments. The sensor response curve is inherently linear within its defined velocity range, supporting stable amplitude tracking under varying shaft dynamic conditions in rotor-bearing assemblies.

Suffix Breakdown & Model Matrix

No formal suffix decomposition is defined for 330500-00-20 beyond ordering configuration. The "-00-20" designation corresponds to factory configuration for mounting adapter option (none) and fixed 20 ft / 6.0 m integral cable assembly. No additional functional segmentation is specified by manufacturer documentation.

Frequently Asked Questions

Q1: Does the 330500-00-20 require external excitation voltage?
A1: No. The sensor is a self-generating piezoelectric device and does not require loop power or external excitation supply.

Q2: Can the output be directly connected to a vibration monitoring system input card?
A2: Yes, the sensor outputs a proportional AC voltage signal suitable for vibration input modules designed for piezo-velocity sensors, provided proper signal conditioning and impedance matching are observed.

Q3: What is the limitation of cable extension beyond 6.0 m?
A3: Extension beyond factory cable length may introduce signal attenuation and noise susceptibility. Any extension should maintain shield continuity and low-noise coaxial integrity.

Field Installation Guidelines

Sensor installation shall ensure rigid mechanical coupling to the monitored machine housing using clean, flat mounting surfaces. The mounting interface must avoid paint layers, corrosion deposits, or mechanical looseness that may distort velocity transfer function.

Cable routing must maintain separation from high-voltage conductors and switching equipment to reduce induced noise coupling. Shield grounding should be executed at a single-point earth reference to prevent ground loop formation.

Avoid sharp cable bends and maintain minimum bend radius consistent with industrial coaxial cabling practice. Mechanical strain relief should be applied near the sensor body to prevent connector fatigue under vibration exposure.

Specifications

• Brand: Bently Nevada

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems