Description

The Bently Nevada 330980-70-CN is a non-contacting 3300 XL NSv Proximitor Sensor designed as an essential part of the 3300 XL NSv Proximity Transducer System. This sensor is optimized for use with centrifugal air compressors, refrigeration compressors, process gas compressors, and other rotating machinery with tight installation space or small target constraints. It is primarily applied on fluid-filmed bearing machines to measure radial vibration, radial position, axial position, phase reference (Keyphasor signals), and zero-speed tachometer parameters. The design excels in environments where sideview, rearview, or counterbore restrictions eliminate the use of standard 5 mm and 8 mm transducer variants.

With a compact mechanical footprint, this Proximitor Sensor provides a 1.5 mm (60 mils) linear range and is configured for a standard 7.0-meter system length with a traditional panel mount orientation. It includes integrated SpringLoc terminal strips that deliver robust, vibration-resistant field connections without requiring specialized compression tools. Additionally, advanced internal protection circuitry yields high RFI/EMI immunity, allowing the device to fulfill European CE mark parameters without demanding dedicated shielded enclosures or isolated mounting brackets.

Features

• Optimizes proximity tracking on rotating machinery featuring restricted access, tight target constraints, and small shaft profiles.
• Flat panel mount design base tabs facilitate direct secure installation against junction box walls or enclosure frames.
• Built-in SpringLoc terminal strips offer reliable field wiring termination that withstands continuous structural vibration.
• Advanced RFI/EMI internal suppression preserves signal tracking accuracy against high-frequency radio signal interference.
• Standardized calibration profile tailored for AISI 4140 steel target faces under nominal factory conditions.

Applications

• Centrifugal air compressors
• Refrigeration compressors
• Process gas compressors
• Radial vibration and fluid-filmed bearing position tracking on small machinery shafts
• Thrust (axial) position tracking on small flat surfaces
• Phase reference tracking and zero-speed tachometer inputs

Ordering Information

Technical Specifications

Installation Guidelines

• Panel Mounting: Mount the sensor flat against the intended enclosure plate or layout junction panel using the structural mounting tabs on the sensor base.
• Wiring Interface: Strip field triad cable lines to the recommended engineering length and insert directly into the SpringLoc terminal paths. Standard terminals accept wire sizes from 0.2 to 1.5 mm2 (16 to 24 AWG).
• System Distance Constraints: Ensure that the cumulative field wiring loop distance separating the Proximitor Sensor from the monitoring system rack does not exceed 305 meters (1000 feet).
• Isolation Precautions: Maintain body isolation from common mechanical grounds via proper installation accessories to shield the measurement circuit from potential ground loops and electrical background noise.

Compliance and Certifications

• EMC Standards: Compliant with European Community Directive 2014/30/EU via EN 61000-6-2 (Industrial Immunity) and EN 61000-6-4 (Industrial Emissions).
• RoHS: Complies with European Community Directive 2011/65/EU.
• Hazardous Area Approvals: Fulfills country-specific safety codes designated under the CN option configuration.