Introduction
The component with part number 330180-51-CN is a key part of the 3300 XL 8mm Proximity Transducer System manufactured by Bently Nevada* (a Baker Hughes company). This part number specifically refers to an 8mm Proximity Probe.
This sensor is a non-contact device designed to measure the relative vibration and position of a rotating shaft. It operates on the eddy current principle, where an RF signal from a proximitor driver is emitted from the probe tip. Changes in the distance to the shaft (the gap) alter the amplitude of this signal, which is then converted into a precise voltage proportional to the gap. The "-51-CN" suffix typically denotes a specific variant, often related to cable length and connector type, potentially for a specific market.
Parameters
The following table outlines the key technical parameters for the 330180-51-CN proximity probe.
| Parameter | Specification |
|---|---|
| Part Number | 330180-51-CN |
| Description | 8mm Proximity Probe |
| Probe Diameter | 8 mm (0.31 inches) |
| Operating Principle | Eddy Current |
| System Scale Factor | 200 mV/mil (7.87 V/mm) when used with a compatible proximitor. |
| Linear Range | Approximately 0.25 to 2.3 mm (10 to 90 mils) from the target. |
| Recommended Target | ASTM A284 Steel or equivalent (required for proper calibration). |
| Temperature Rating | Standard: -35°C to 150°C (-31°F to 302°F) High-Temp: Up to 177°C (350°F) with high-temperature cable. |
| Cable Length | The "-51" often indicates a specific length, commonly 1 meter or 5 feet. The exact length must be confirmed from the datasheet. |
| Electrical Connection | Integral cable with a standard Bently Nevada 3-pin connector. |
| Thread | 1-1/4 UNF (for mounting in a threaded bushing) |
| Dimensions (Probe Body) | Diameter: 8 mm, Length: ~40-60 mm (varies by model) |
| Weight (Approx., with 1m cable) | 0.2 kg (0.44 lb) |
Application Scenarios
The 330180-51-CN 8mm proximity probe is a fundamental sensor for machinery condition monitoring and protection. Its primary application scenarios include:
Radial Vibration Monitoring:
Mounted perpendicular to the shaft at bearing housings to measure the dynamic motion (vibration) of the rotor relative to the bearing. This is essential for detecting unbalance, misalignment, and oil whirl.
Keyphasor® Reference Signal:
Used to provide a once-per-revolution timing mark by observing a keyway or notch on the shaft. This signal is critical for measuring phase lag and speed, which are vital for machine balancing and transient analysis.
Axial (Thrust) Position Monitoring:
Mounted parallel to the shaft axis to monitor the position of the thrust collar, ensuring the rotor remains within its designed axial clearance to prevent catastrophic damage.
Eccentricity (Slow-Roll) Monitoring:
Measures shaft bow or bend when the machine is at low speeds or on turning gear, helping to prevent high vibration during startup.
Differential Expansion Monitoring:
Used on large turbines to measure the difference in thermal growth between the rotor and the stator (casing).
Typical Machinery Monitored:
Steam Turbines & Gas Turbines
Centrifugal & Axial Compressors
Large Pumps & Motors
Generators
Fans & Gearboxes
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