Bently Nevada 330980-71-05 3300 XL 8mm Proximity Transducer System

Key Parameters and Features

Core Features & Advantages

• Designed for Space-Constrained Applications: The module's standout feature is its NSv (Narrow Side View) design, specifically engineered for centrifugal air compressors, refrigeration compressors, and process gas compressors where tight installation restrictions prevent the use of standard 3300 XL 8mm probes. It accommodates small shaft diameters under 51 mm (2 in) and axial targets smaller than 15 mm (0.6 in).

• Enhanced RFI/EMI Immunity: The 3300 XL NSv Proximitor features improved radio frequency interference and electromagnetic interference immunity, satisfying European CE mark approvals without requiring special shielded conduit or metallic housings. This allows installation in fiberglass housings or near radio equipment without signal degradation, reducing installation costs and complexity.

• SpringLoc Terminal Connections: The module features patented SpringLoc terminal strips that require no special installation tools. These terminals provide strong, vibration-resistant connections by eliminating screw-type clamping mechanisms that can loosen over time, ensuring reliable field wiring in high-vibration environments.

• High Signal Accuracy and Stability: The system delivers a linear range of 1.5 mm (60 mils) with a scale factor of 7.87 V/mm, ensuring precise measurement for small targets. The NSv Proximitor maintains specified accuracy from 0°C to +45°C ambient and features less than 2 mV change in output voltage per volt change in input supply.

• Complete Interchangeability: All 3300 XL 8mm proximity transducer systems support complete interchangeability of probes, extension cables, and Proximitor sensors, eliminating the need to match or bench calibrate individual components.

Typical Applications

The 330980-71-05 is widely used for critical machinery monitoring in space-constrained installations:

• Centrifugal Air Compressors: Radial vibration monitoring where tight clearance around bearing housings prevents standard probe installation

• Refrigeration Compressors: Axial position measurement with restricted counterbore access

• Process Gas Compressors: Shaft vibration monitoring on small shafts (under 51 mm diameter)

• Keyphasor and Tachometer Installations: Phase reference and speed measurement where space is at a premium

Frequently Asked Questions (FAQ)

Q1: What is the primary function of the 330980-71-05?

A: It is a signal conditioning module (Proximitor Sensor) that works with 3300 NSv proximity probes and extension cables to form a complete transducer system. It receives the gap voltage signal from the probe, applies linearization and temperature compensation, and outputs a DC voltage proportional to position superimposed with AC vibration signal.

Q2: What is the difference between the 330980-71-05 and standard 3300 XL 8mm Proximitor Sensors?

A: The 330980-71-05 is an NSv (Narrow Side View) Proximitor, designed for space-constrained applications where standard 3300 XL 8mm probes cannot fit. It has a slim, compact form factor and works with NSv probes that accommodate small shaft diameters (under 51mm) and small target areas (under 15mm). Standard 3300 XL Proximitors (e.g., 330180 series) are for conventional installations.

Q3: What is the linear range of this system?

A: The NSv system has a linear range of 1.5 mm (60 mils), from approximately 0.25 mm to 1.75 mm gap.

Q4: What mounting options are available?

A: This model (Option 71) features DIN rail mounting with a slim design for high-density installations. A 4-hole mounting pattern matches previous Proximitor designs for retrofit compatibility. Panel mount options are also available (Option 70).

Q5: What is the recommended gap voltage for installation?

A: A healthy system should read between -9 V and -12 V DC at the monitor or extension cable connector. A reading near -2 V indicates a shorted probe or cable, while a reading near -24 V indicates an open circuit.

Q6: Does this system require calibration?

A: No. The 3300 XL system supports complete interchangeability of probes, extension cables, and Proximitor sensors, eliminating the need to bench calibrate or match individual components.

Q7: What environmental conditions can this module withstand?

A: The Proximitor operates from -52°C to +100°C and can withstand 100% condensing humidity when connectors are protected. The NSv system is designed for reliable operation in industrial environments with enhanced RFI/EMI immunity.

Recommended Models & Related Products

The 330980-71-05 is part of the 3300 XL NSv Proximitor Sensor family. Below are related models for different system lengths and configurations:

Choosing the Right Model

• For space-constrained installations: The 330980-71-05 is the correct choice for centrifugal compressors and applications with limited mounting space.

• For standard 8mm applications: Consider the 330180 series (e.g., 330180-51-05) for conventional installations where space is not restricted.

• For hazardous area installations: The multiple approvals option (included in 330980-71-05) ensures compliance with ATEX, IECEx, and CSA standards.