Bently Nevada 330878-50-CN Proximitor Sensor High-Temperature Case & Cable Assembly

The Bently Nevada 330878-50-CN is a specialized component within the renowned 3300 XL 50mm Proximitor Sensor System, designed by Baker Hughes . While standard proximity systems measure vibration and position, this specific model is engineered as a High-Temperature Case and Cable Assembly, making it the ideal choice for extreme environment monitoring in critical machinery .

Product Overview

The Bently Nevada 3300 XL series is the industry standard for protecting turbomachinery. The 50mm system, to which the 330878-50-CN belongs, is specifically designed to measure differential expansion in large steam turbine generators . Differential expansion—the relative expansion between the rotor and the casing—is a critical parameter; if not monitored accurately, it can lead to catastrophic internal rubbing and machine failure.

The 330878-50-CN part number specifically denotes the Proximitor sensor case and integral cable assembly configured for high-temperature applications . It works in concert with 3300 XL 50mm probes and extension cables to form a complete monitoring system.

Key Technical Specifications

Understanding the "CN" designation in the part number is crucial for maintenance and procurement teams:

Part Number: 330878-50-CN

System Type: 3300 XL 50mm Proximitor System

Configuration: Proximitor Sensor Case with Integral Cable

Cable Length: 5.0 meters (integral) 

Agency Approval: "CN" indicates approval for use in China (China RoHS / METI Certification) .

Typical Probes: Designed for use with 3300 XL 50mm probes (e.g., 330878-50-CN pairs with the probe part number series like 330878-50-00) .

Applications: Where is it used?

Due to its robust design, the Bently Nevada 330878-50-CN is primarily deployed in the power generation industry. Its ability to withstand high temperatures makes it indispensable for:

Large Steam Turbine Generators: Monitoring Differential Expansion and Shell Expansion .

Medium to Large Rotating Machinery: Where standard sensors cannot survive the ambient heat .

Why Choose the 3300 XL Series?

The 3300 XL platform offers significant advantages that make the 330878-50-CN a reliable choice:

RFI/EMI Immunity: The Proximitor design offers exceptional resistance to radio frequency and electromagnetic interference. It can be mounted in glass fiber enclosures without risk of signal disruption from nearby radio transmissions .

Robust Mechanical Design: The case and cable assembly are built to survive in harsh industrial environments. The terminal connections are designed for secure, vibration-resistant wiring without the need for specialized tools .

System Compatibility: This sensor seamlessly integrates with Bently Nevada monitoring infrastructure, including the 3500 Monitoring System racks and modules (such as the 3500/40, 3500/42, and 3500/45 monitors), ensuring that critical data reaches the control room accurately .

Physical Characteristics

Material: A 308 Aluminum (Case) 

Weight: 255 grams 

Temperature Range: Rated for use in extreme conditions from -35°C to +85°C (-31°F to +185°F) .

Power Requirement: -17.5 Vdc to -26 Vdc (without barrier) .

Summary

For engineers and plant managers responsible for the reliability of large steam turbines, the Bently Nevada 330878-50-CN is a critical spare part. It ensures that you have the correct high-temperature differential expansion sensor with the proper Chinese (CN) safety certifications.

When ordering, ensure you verify the system compatibility. The "330878-50-CN" is the Proximitor assembly; it requires the matching 3300 XL 50mm probe and extension cable to complete the channel. Trust Bently Nevada—the gold standard in machinery protection—to keep your high-value assets running safely .

Keywords: Bently Nevada 330878-50-CN, 3300 XL Proximitor, 50mm Proximitor, Bently Nevada High Temperature, Differential Expansion Sensor, Steam Turbine Monitoring, 330878-50-CN, Bently Proximitor Probe, Machinery Protection Systems, Baker Hughes Bently Nevada.