Product Overview
The Bently Nevada 330878-50-00 3300 XL 50 mm Proximitor Sensor is a high-performance signal conditioning module designed for the 3300 XL 50 mm Proximity Transducer System. Working together with a compatible 50 mm proximity probe and extension cable, the Proximitor Sensor converts the probe's eddy current signal into a stable voltage output for accurate monitoring of shaft displacement, differential expansion, and rotor position.
Designed for continuous operation in demanding industrial environments, this Proximitor Sensor features advanced RFI/EMI immunity, a compact housing for high-density installations, and reliable long-term performance. The 50 configuration provides a 5.0-meter (16.4-foot) system length with panel-mount installation, while the 00 suffix indicates the standard version supplied without agency approvals. It is widely used in steam turbine supervisory instrumentation (TSI), power generation, and other critical rotating machinery applications.
Technical Specifications
| Item | Description |
|---|
| Manufacturer | Bently Nevada |
| Model Number | 330878-50-00 |
| Product Type | 3300 XL 50 mm Proximitor Sensor |
| Product Series | 3300 XL 50 mm Proximity Transducer System |
| System Length Option | 5.0 m (16.4 ft) |
| Mounting Method | Panel Mount |
| Input | One 3300 XL 50 mm Probe and Extension Cable |
| Output | 394 mV/mm (10 mV/mil) Nominal |
| Linear Measurement Range | 27.9 mm (1100 mils) |
| Power Requirement | -17.5 to -26 VDC |
| Output Resistance | 50 Ω |
| Operating Temperature | -35°C to +65°C (Sensor) |
| Agency Approval | 00 – No Approvals |
| Approximate Dimensions | 120 × 85 × 25 mm |
| Approximate Weight | Approx. 0.32 kg |
Typical Applications
The 330878-50-00 Proximitor Sensor is engineered for precision monitoring of large rotating equipment where reliable displacement measurement is essential for equipment protection and operational efficiency.
Typical applications include:
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Steam turbine differential expansion monitoring
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Rotor axial position measurement
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Turbine Supervisory Instrumentation (TSI) systems
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Large generator protection
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Gas turbine monitoring
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Centrifugal compressor condition monitoring
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Industrial pump protection
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Power generation facilities
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Petrochemical processing plants
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Oil and gas production systems
Key Advantages
Built for high-performance industrial monitoring systems, the 330878-50-00 offers dependable signal conditioning and long-term operational stability.
Key benefits include:
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Optimized for the 3300 XL 50 mm Proximity Transducer System
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High linearity for accurate displacement and expansion measurements
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Excellent RFI/EMI immunity for reliable operation in electrically noisy environments
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Compact housing supports high-density panel installations
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Panel-mount design simplifies installation and maintenance
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Stable output improves machinery protection accuracy
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Durable industrial construction for continuous operation
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Compatible with demanding turbine monitoring applications
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Supports predictive maintenance strategies by delivering consistent measurement data
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Helps maximize equipment availability while reducing unplanned downtime.
Technical FAQs
1. What is the function of the 330878-50-00 Proximitor Sensor?
It conditions the signal from the 3300 XL 50 mm proximity probe and converts it into a calibrated voltage output for machinery monitoring systems.
2. Which transducer system is this sensor designed for?
It is designed exclusively for the 3300 XL 50 mm Proximity Transducer System.
3. What does the "50" configuration represent?
It specifies a 5.0-meter (16.4-foot) system length with a panel-mount configuration.
4. What does the "00" suffix indicate?
The "00" option identifies the standard version supplied without additional agency approvals.
5. What is the nominal output scale factor?
The Proximitor Sensor provides a nominal output of 394 mV/mm (10 mV/mil).
6. What is the maximum linear measurement range?
The complete transducer system offers a linear measurement range of 27.9 mm (1100 mils).
7. Can this sensor be installed in high-density control panels?
Yes. Its slim housing is designed for both high-density panel layouts and conventional installations.
8. What industries commonly use this Proximitor Sensor?
It is widely used in power generation, petrochemical processing, oil and gas, mining, and other industries operating critical rotating machinery.
9. Can it replace older 7200 Series Proximitor Sensors?
When used with matching 3300 XL 50 mm probes and extension cables, it can support upgrades from compatible legacy 7200 Series systems.
10. Why should matching system components be used together?
Using compatible probes, extension cables, and the Proximitor Sensor preserves factory calibration, ensuring optimum measurement accuracy and dependable long-term performance.
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