Bently Nevada 330850-90-CN 3300 XL 25 mm Proximitor Sensor

Description

330850-90-CN: 3300 XL 25 mm Proximitor Sensor configured for 9.0 meters total system length, panel mounting, and equipped with the -CN China hazardous area approval package.

This eddy-current sensor operates as part of the 3300 XL 25 mm Proximity Transducer System, translating the high-frequency signal from a 25 mm probe into a linear voltage output of 0.787 V/mm (20 mV/mil). The 12.7 mm (500 mils) linear range is optimized for large-target displacement measurements, including steam turbine thrust position and rod-drop monitoring. The -CN designation includes NEPSI and CCC certifications, validating the module for installation in regulated Chinese hazardous areas.

Features

• 9.0 meters system length configuration, designed for panel mount installations.
• 12.7 mm (500 mils) linear range beginning at 0.63 mm (25 mils) from the target surface.
• Nominal average scale factor of 0.787 V/mm (20 mV/mil) for precise signal resolution.
• Integrated -CN China approval package with NEPSI and CCC certifications.
• Broad operating temperature range of -51 degC to +100 degC (-60 degF to +212 degF).
• High RFI/EMI immunity meeting European CE mark requirements without special mounting.

Applications

• Large-target eddy-current displacement measurement.
• Steam turbine thrust position monitoring.
• Reciprocating compressor rod-drop monitoring.
• Differential expansion measurements on mid-size to large steam turbine generators.

Ordering Information

Technical Specifications

Connections and Interfaces

Installation Guidelines

• Mount the Proximitor sensor on a clean, flat surface using the integrated panel-mount holes.
• Use three-conductor shielded triad cable for field wiring between the Proximitor sensor and the monitor.
• Ensure the field wiring does not exceed a maximum length of 305 meters (1000 feet) to prevent signal rolloff.
• Connect the 3300 XL 25 mm probe and extension cable matching the total 9.0 meters system length calibration.
• Terminate the field wiring shield at the monitor end only to prevent ground loops.

Compliance and Certifications

• NEPSI: Explosive atmosphere protection certification for China.
• CCC: China Compulsory Certification for hazardous area products.
• CE: Complies with European RFI/EMI immunity requirements.