Bently Nevada 330850-50-CN 3300 XL 25 mm Proximitor Sensor

The Bently Nevada 330850-50-CN is a high-performance 3300 XL 25 mm Proximitor Sensor designed for precision measurement of differential expansion (DE) in rotating machinery . As part of GE's Bently Nevada product line, this signal conditioning module works with 25 mm proximity probes and extension cables to form a complete transducer system for protecting critical assets including steam turbines, gas turbines, compressors, and large pumps .

Key Features and Benefits

Advanced Signal Processing

The 330850-50-CN delivers exceptional measurement accuracy with 7.87 mV/μm (200 mV/mil) sensitivity and a linear range of 12.7 mm (500 mils), making it ideal for differential expansion monitoring on midsize to large steam turbine generators . Its output characteristics match previous 7200 and 25 mm DE systems, enabling seamless upgrades without monitor reconfiguration .

Superior Environmental Immunity

Engineered with improved RFI/EMI immunity, this Proximitor Sensor achieves European CE mark approvals without special mounting considerations . It operates reliably in harsh industrial environments, with a wide temperature range of -40°C to +85°C and triple electromagnetic shielding that ensures stable performance even near high-frequency radio signals .

Flexible Installation

The thin-profile design supports both high-density DIN-rail mounting and traditional panel configurations . SpringLoc terminal strips require no special tools and enable faster, vibration-resistant field wiring connections .

Industrial Compliance

Certified to API 670 standards and featuring NEPSI certification for China hazardous areas, the 330850-50-CN meets rigorous international requirements for machinery protection systems .

Technical Specifications

Parameter Specification

Model Number 330850-50-CN

Compatible Probes 3300 XL 25 mm proximity probes

Output Sensitivity 7.87 mV/μm (200 mV/mil)

Linear Range 0.25-2.3 mm (10-90 mils)

Frequency Response 0-2.7 kHz with up to 305 m wiring

Operating Temperature -40°C to +85°C

Power Supply 24V DC ±10%

Output Interface Voltage proportional to target gap

Certifications CE, NEPSI, API 670 compliant

Applications

The 330850-50-CN excels in critical machinery monitoring across industries:

Power Generation: Steam turbine differential expansion monitoring

Oil & Gas: Centrifugal compressor shaft position tracking

Petrochemical: Pump and motor vibration surveillance

Metallurgy: Rolling mill equipment protection

System Compatibility

This Proximitor Sensor integrates seamlessly with the full 3300 XL system architecture, including 25 mm proximity probes (such as 330851 series) and extension cables (330854 series) . It provides backward compatibility with existing monitoring systems while enabling migration to modern protection platforms like the 3500 Series monitoring systems .

The Bently Nevada 330850-50-CN 3300 XL 25 mm Proximitor Sensor represents the gold standard for differential expansion measurement in rotating machinery. Its combination of precision engineering, environmental ruggedness, and installation flexibility makes it the preferred choice for reliability professionals seeking to protect capital equipment and minimize unplanned downtime.