Bently Nevada 330780-91-CN

Product Overview

The Bentley Nevada 330780-91-CN Proximity Sensor is a key component of the 3300 XL 11 mm Proximity Sensor System. This sensor is designed for vibration and displacement measurement on rotating machinery, requiring a wide linear measurement range and high reliability. As part of a complete sensor system, it converts mechanical movement into a highly accurate electrical signal, making it ideal for industrial applications with small measurement ranges.

Product Features

Flexible Mounting: The "-91" option in the model number indicates that this proximity sensor is DIN-rail compatible, allowing for compact installation in high-density control cabinets. It is also suitable for traditional panel mounting.

Excellent Immunity: Excellent immunity to radio frequency and electromagnetic interference (RFI/EMI) meets European CE marking requirements. It effectively blocks high-frequency radio signal interference, ensuring signal stability in the field.

Easy Wiring: SpringLoc terminals allow for quick and reliable field wiring without special tools, significantly reducing installation and maintenance efforts.

System Length: This model number indicates a total system length of 9.0 m (including the probe cable and extension cable). This probe is ideal for applications located far from the monitoring cabinet.

Comprehensive Certification Support: The "-CN" suffix in the model number indicates certification by multiple certification agencies, meeting compliance requirements for a wide range of global applications, including hazardous locations.

Applications

This proximity sensor is ideal for critical measurements such as:

Shaft position measurement (thrust measurement)

Differential thermal expansion measurement in steam turbines

Connecting rod position or load loss monitoring in reciprocating compressors

Critical phase and stall speed measurement

Compatible and Interchangeable

System Features: The 330780-91-CN can be used in conjunction with the 3300 XL 11 mm probe and 3300 XL 11 mm extension cable to create a complete measurement system.

Upgrades and Replacements: This sensor replaces existing 7200 Series 11 mm and 14 mm sensor systems. Upgrading from the 7200 Series requires replacing all components (probes, extension cables, and proximity sensors) with 11 mm 3300 XL components and upgrading the corresponding monitoring system.

Incompatibility: This system is not compatible with other standard Bentley Nevada systems (e.g., 5 mm, 8 mm, and NSv Type 3300 XL systems).

Performance Degradation

Linear Range and Output: This system offers a wide linear range, extending from approximately 0.5 mm to 4.0 mm in front of the target. The average scale factor is 3.94 V/mm, which differs from standard 8 mm systems. Therefore, careful system configuration is required.

Frequency Response: The typical frequency response is 0 to 8 kHz, accurately capturing the dynamic behavior of most large rotating machinery.

Target Size Requirements: To ensure measurement accuracy and avoid crosstalk, a shaft diameter of 152 mm or greater is recommended for radial vibration measurements. Applications with smaller shaft diameters may require narrower or wider probe spacing.

Field cable length: The maximum allowable field cable length from the proximity sensor to the monitor is 305 m. If the cable length is too long, high-frequency signals may be attenuated.