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Product Introduction
The Bently Nevada 330780-91-CN is a high-performance Proximitor Sensor from the 3300 XL 11 mm series, widely recognized for its reliability and precision in industrial vibration and position monitoring. Specifically engineered for use with 11 mm proximity probes, this model forms a critical part of Bently Nevada’s transducer system used in machinery protection and condition monitoring applications. The “CN” designation typically indicates a configuration or packaging variant intended for the Chinese market, without sacrificing technical integrity or performance.
This sensor plays a vital role in detecting radial shaft vibration, axial thrust position, and phase reference, especially in high-speed rotating equipment like turbines, compressors, and large industrial motors.
Product Specifications
| Parameter | Specification |
| Model Number | 330780-91-CN |
| Product Series | 3300 XL |
| Sensor Type | Proximitor Sensor |
| Compatible Probe Diameter | 11 mm |
| Total Length | 9 meters |
| Output Signal | –200 mV/mil (–7.87 mV/μm) |
| Sensitivity | 200 mV/mil ±5% |
| Power Supply Requirement | –24 to –28 Vdc |
| Input Impedance | >10 MΩ |
| Frequency Response | 0 to 10 kHz nominal |
| Operating Temperature Range | –35°C to +100°C |
| Storage Temperature Range | –51°C to +177°C |
| Humidity Resistance | 95% non-condensing |
| Mounting Method | DIN Rail or Panel Mount |
| Enclosure Material | Aluminum with industrial-grade finish |
| Weight | 0.255 kg |
| Compliance Certifications | CE, ATEX, CSA, IECEx, RoHS |
Product Applications
The Bently Nevada 330780-91-CN is a key component in vibration and position monitoring systems, typically used in:
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Steam and gas turbines for radial and axial vibration analysis
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Centrifugal compressors for bearing and thrust position monitoring
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Large electric motors and generators to monitor shaft position and movement
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Industrial pumps and fans where imbalance and misalignment need detection
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Gearboxes and speed reducers for early fault identification
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Offshore oil platforms and petrochemical plants requiring rugged, certified equipment
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Power generation stations, especially in condition-based maintenance programs
Product Advantages
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API 670 Compliant: Designed to meet rigorous industry standards for critical machinery monitoring.
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Stable, Repeatable Output: Excellent linearity and low drift over time.
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Environmentally Robust: Operates effectively under wide temperature, vibration, and humidity conditions.
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Long-Term Deployment: Proven durability for use in long-life equipment installations.
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Interchangeable System Components: Fully compatible with 3300 XL probes and extension cables.
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Precision Engineering: Delivers highly accurate displacement and vibration measurements.
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Field-Proven Reliability: Trusted by OEMs and end users in thousands of machines worldwide.
Latest Product News Headlines
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“Bently Nevada 3300 XL Sensors Now Available in Enhanced CN Configurations”
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“330780-91-CN Deployed in Asia-Pacific Hydro Plants for Shaft Monitoring”
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“GE Bently Nevada Launches Localization Strategy with CN-Series Sensors”
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“New Firmware Enhancements Improve Stability in 3300 XL Proximitor Range”
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“330780 Series Aids in Condition Monitoring for LNG Compressors”
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“Oil & Gas Sector Increasingly Adopts CN Models for Asset Reliability”
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“Bently Nevada Extends 3300 XL Line to Meet Global Certification Requirements”
Frequently Asked Questions (FAQ)
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What does the ‘CN’ suffix in 330780-91-CN represent?
It typically indicates a region-specific configuration, possibly for compliance with Chinese industry or shipping standards, without affecting the electrical or mechanical specifications. -
Can the 330780-91-CN be used with any 11 mm proximity probe?
It is optimized for use with the Bently Nevada 3300 XL 11 mm proximity probes, ensuring linearity and calibration integrity. -
How accurate is the sensor’s output signal?
The sensor provides a nominal sensitivity of –200 mV/mil (±5%) for precise displacement measurement. -
Is it compatible with legacy Bently Nevada systems?
Yes. It supports backward compatibility with older 3300 systems and works seamlessly with the 3500 Monitoring System. -
What kind of environments is it designed for?
It is ruggedized for use in high-vibration, high-temperature, and high-humidity industrial environments. -
What’s the maximum cable length supported?
The standard full system length can be up to 9 meters, including the probe, extension cable, and Proximitor sensor. -
Is recalibration needed over time?
Thanks to its thermal stability and mechanical design, recalibration is rarely needed during normal service life. -
What mounting options are available?
The sensor can be mounted on DIN rails or directly onto flat panels using standard screws. -
Are there explosion-proof versions available?
Yes. Depending on configuration and certifications, versions may be rated for ATEX/IECEx hazardous environments. -
Does the sensor work with third-party vibration systems?
While designed for Bently Nevada systems, it can output standard analog signals suitable for some third-party vibration monitoring tools.
Recommended Related Models (Same Series or Application)
| Model | Description | System Length | Output Signal |
| 330780-90-05 | 3300 XL 11 mm Proximitor Sensor, 9.0 m system | 9.0 meters | –200 mV/mil |
| 330780-91-05 | 3300 XL 11 mm Proximitor Sensor, 91° connector | 9.0 meters | –200 mV/mil |
| 330780-50-00 | 3300 XL Proximitor Sensor, short cable version | 5.0 meters | –200 mV/mil |
| 330130-080-00-00 | 3300 XL 11 mm Proximity Probe | Probe only | –200 mV/mil |
| 330180-91-00 | 11 mm Extension Cable for 3300 XL System | 9.1 meters | Extension Cable only |
| 330103-00-07-10-02-00 | 3300 XL Reverse Mount Probe, 8 mm Tip | 7.0 meters | –200 mV/mil |
Popular Bently Nevada Models (Same Brand)
| Model | Description | Application | Output |
| 3500/22M | Keyphasor Module for 3500 Monitoring System | Shaft speed and phase | Digital |
| 3500/42M | Proximitor/Seismic Monitor | Vibration monitoring | Buffered + relay |
| 330500 | Velocity Transducer | Low-frequency vibration | 3.94 mV/mm/s |
| 330104-00-12-10-02-00 | 3300 XL 8 mm Probe for compact spaces | Tight clearance applications | –200 mV/mil |
| 330400 | Accelerometer for seismic monitoring | Structural vibration | ±500 mV/g |
| 1900/65A | Compact Monitor for Motor/Compressor Health | Entry-level condition monitoring | Relay + 4–20 mA |
