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Product Introduction
The Bently Nevada 330878-91-00 is part of the 3300 XL series of Proximitor sensors manufactured by Baker Hughes (GE Bently Nevada). Engineered for industrial-grade vibration monitoring and machine condition diagnostics, this proximity sensor is specifically designed for applications requiring a larger linear range—up to 50 mm. With robust construction and advanced signal processing, the 330878-91-00 sensor is ideal for monitoring critical rotating machinery in demanding environments such as turbines, compressors, motors, and pumps.
Its 3300 XL technology ensures high precision and long-term reliability with low susceptibility to electrical interference and temperature drift. This sensor is frequently used alongside a Proximitor driver and extension cable, forming a complete proximity transducer system.
Technical Specifications
| Parameter | Description |
|---|---|
| Model Number | 330878-91-00 |
| Series | 3300 XL |
| Probe Type | Non-contact eddy current proximity probe |
| Sensing Range | 0 to 50 mm (1.97 in) |
| Linear Range | 12.7 mm (0.5 in) typical with standard calibration |
| Output | -200 mV/mil (typical) |
| Frequency Response | 0 to 10 kHz (typical) |
| Operating Temperature Range | -35°C to +177°C (-31°F to +350°F) |
| System Accuracy | ±0.25 mils (±6.4 μm) within calibrated range |
| Probe Tip Material | Polyphenylene sulfide (PPS) |
| Housing Material | AISI 303/304 stainless steel |
| Cable Connector Type | Miniature coaxial connector |
| Recommended Extension Cable | 330130-XXX-00-00 series |
| Recommended Proximitor Module | 3300 XL Proximitor Sensor (3300 XL series module) |
| Weight | 0.22 kg |
| Overall Probe Length | 91.4 mm (3.6 in) probe body |
| Mounting Thread | 1/4-28 UNF or M8x1 (based on configuration) |
| Protection Rating | IP65 (with properly sealed connector) |
| Compliance | CE, RoHS, ATEX (with appropriate installation) |
Product Applications
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Turbomachinery Monitoring – Used extensively in gas and steam turbines to monitor rotor position and shaft vibration.
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Compressors and Pumps – Detects shaft movement and displacement in high-speed compressors and critical process pumps.
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Motors and Generators – Ensures proper alignment and identifies early-stage bearing wear or shaft instability.
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Industrial Gearboxes – Measures axial and radial displacement of shafts under load.
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OEM Machine Building – Integrated into rotating equipment designs by machinery manufacturers.
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Condition-Based Maintenance – Key component in predictive maintenance systems using proximity detection.
Product Advantages
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High Precision and Sensitivity: Provides accurate displacement readings in harsh environments.
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Extended Linear Range: Offers a longer sensing range compared to standard 3300 XL probes (up to 50 mm).
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Rugged Construction: Built with durable stainless steel and high-temperature insulation for long-term reliability.
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Ease of Integration: Compatible with existing Bently Nevada systems using standard connectors and modules.
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EMI/RFI Shielding: Reduced noise and improved signal stability even in electrically noisy installations.
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Wide Temperature Operation: Operates reliably in extreme thermal conditions ranging from -35°C to +177°C.
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Global Certifications: Compliant with industrial standards including CE, ATEX, and RoHS for hazardous environments.
Frequently Asked Questions (FAQ)
-
Q: What is the main purpose of the 330878-91-00 sensor?
A: It is used for non-contact displacement and vibration monitoring of rotating machinery shafts. -
Q: Can this sensor be used in high-temperature environments?
A: Yes, it is designed to operate in temperatures up to 177°C (350°F). -
Q: Is this sensor compatible with older Bently Nevada monitoring systems?
A: Yes, it is backward-compatible with most 3300 systems when paired with the correct extension cable and Proximitor module. -
Q: What type of cable is recommended for this sensor?
A: The 330130-XXX-00-00 extension cable series is typically used. -
Q: What is the linear range of this proximity probe?
A: Approximately 12.7 mm (0.5 in) in its calibrated region, with sensing up to 50 mm. -
Q: What types of machinery benefit from this sensor?
A: It is commonly used in turbines, compressors, motors, pumps, and gearboxes. -
Q: How is the sensor mounted on equipment?
A: It features threaded mounting (e.g., 1/4-28 UNF), which allows secure installation in a probe holder or bracket. -
Q: Is this sensor waterproof or dustproof?
A: It has an IP65 rating when installed with sealed connectors. -
Q: Does it require a specific orientation for installation?
A: It should be installed perpendicular to the target shaft surface for optimal accuracy. -
Q: What makes the 330878-91-00 different from standard 3300 XL probes?
A: The key difference is its extended sensing range (up to 50 mm), offering more flexibility for large shaft or clearance applications.
Related Models from the Same Series (3300 XL)
| Model | Description | Sensing Range | Mounting Thread | Cable Type |
|---|---|---|---|---|
| 330878-90-00 | 3300 XL 25 mm Proximitor Sensor | Up to 25 mm | 1/4-28 UNF | Mini coaxial |
| 330880-90-05 | 3300 XL 8 mm Proximity Probe, armored cable | Up to 8 mm | M10x1 | Armored or unarmored |
| 330780-91-00 | 3300 XL 11 mm Reverse Mount Probe | Up to 11 mm | Reverse mount | Mini coaxial |
| 330930-065-01-00 | 3300 XL Extension Cable, 6.5 m | N/A | N/A | Coaxial |
| 330105-02-12-10-02-05 | 3300 XL 8 mm Probe with connector protector | 8 mm | 3/8-24 UNF | Armored with booted tip |
| 330180-90-00 | 3300 XL 25 mm Reverse Mount Probe | Up to 25 mm | Reverse mount | High-temperature compatible |
Popular Models from Bently Nevada (General Product Line)
| Model | Description | Category | Key Feature |
|---|---|---|---|
| 3500/22M | Transient Data Interface Module | 3500 Series Monitoring | Buffered output and dynamic data |
| 3500/42M | Proximitor/Seismic Monitor | 3500 Series Monitoring | Monitors vibration, thrust, and axial |
| 330104-00-12-10-02-00 | 3300 XL 8 mm Probe | Proximity Probe | Unarmored, standard tip |
| 330130-080-00-00 | 3300 XL Extension Cable (8.0 m) | Extension Cable | Connects probe to proximitor module |
| 330400 | Velomitor Piezoelectric Velocity Sensor | Seismic Sensor | Measures casing vibration |
| 190501 | Velocity Transducer | Vibration Monitoring | For lower-frequency machine monitoring |
