BENTLY 330980-51-00

Description

Product Overview

The BENTLY 330980-51-00 is a highly specialized and sensitive vibration transducer, specifically a Proximity Probe, designed for the continuous monitoring of rotating and reciprocating machinery. This device is a critical component in predictive maintenance and machinery protection systems, providing direct measurement of shaft relative displacement (position), vibration, and phase reference. The BENTLY 330980-51-00 probe system typically includes the probe itself, an extension cable, and a driver (oscillator/demodulator) module. It operates on the eddy current principle, where the probe generates an electromagnetic field, and changes in the gap between the probe tip and the conductive target (usually the machine shaft) are converted into a precise DC voltage proportional to distance. The reliability and accuracy of the BENTLY 330980-51-00 are paramount for detecting issues like shaft misalignment, imbalance, bearing wear, and oil whirl in turbomachinery such as compressors, turbines, and large pumps.

Product Parameters and Specifications

• Manufacturer: Bently Nevada (part of Baker Hughes).

• Product Type: Proximity Probe System (Displacement Transducer).

• System Components:

  • Probe (330980-51-00): The actual sensor, mounted in a threaded barrel, containing a coil. The “-51” often denotes a specific sensitivity (e.g., 200 mV/mil or 7.87 V/mm) and physical length.

  • Extension Cable: Insulated, shielded coaxial cable of specified length to connect the probe to the driver.

  • Driver (Oscillator-Demodulator): A separate electronic module (e.g., from the 3300 XL 8mm system) that powers the probe, conditions the signal, and outputs a scaled DC voltage (-24V to -2V DC typically) representing gap.

• Measurement: Non-contact measurement of the distance (gap) between the probe tip and the target.

• Target Material: Requires a conductive target, typically ferrous steel (mild steel is the calibration standard). Other materials require re-calibration.

• Sensitivity: Factory-calibrated, commonly 200 mV/mil (7.87 V/mm). The exact value is marked on the probe body and must match the driver module’s setting.

• Linear Range: Operates within a specified linear range from the probe tip (e.g., 0-80 mils or 0-2 mm). The recommended installation gap (e.g., 40 mils or 1 mm) is set within this range.

• Frequency Response: Capable of measuring both static position (slow-roll runout) and dynamic vibration up to high frequencies (often 10 kHz or more), capturing even very fast vibration events.

• Temperature Rating: The probe is rated for high temperatures, often up to 120°C (248°F) or more, suitable for mounting near hot bearing housings.

Advantages and Key Features

1. Direct Measurement of Shaft Motion: Unlike case-mounted accelerometers, the BENTLY 330980-51-00 measures the actual movement of the shaft relative to the bearing housing. This is the most critical parameter for determining dynamic load on bearings and detecting instability.

2. High Reliability and Precision: Bently Nevada probes are industry standards for critical machinery. They offer exceptional linearity, stability, and repeatability, providing trustworthy data for both protection and analysis.

3. Dual-Purpose Output: The signal contains both a DC Gap Voltage (for average shaft position within the bearing clearance) and an AC Vibration Voltage (superimposed on the DC). This allows a single BENTLY 330980-51-00 probe to monitor both slow-changing alignment issues and high-frequency vibration.

4. Essential for Phase Measurement: When paired with a Keyphasor® probe, it provides vibration phase information, which is indispensable for diagnosing imbalance, misalignment, and resonance during machine startup (slow roll) and operation.

5. Robust Industrial Design: Built to withstand harsh environments including oil mist, steam, and high temperatures, ensuring long-term performance in demanding industrial and energy applications.

Application Case Studies

• Centrifugal Compressor Thrust Bearing Monitoring: Two BENTLY 330980-51-00 probes are installed axially on a compressor shaft to measure thrust position. They monitor the float of the rotor within the thrust bearing clearance, providing early warning of catastrophic failure due to thrust collar wear or hydraulic imbalance.

• Steam Turbine Radial Vibration Monitoring: Probes installed in X and Y orientations (90 degrees apart) at each bearing provide a full orbit plot of the shaft’s centerline motion. This data from the 330980-51-00 probes is used by a protection system (like a Bently Nevada 3500) to trip the turbine if vibration exceeds safe limits and by analysts to diagnose the root cause.

• Hydroelectric Generator Shaft Runout Measurement: During startup, the DC gap voltage from these probes is used to measure mechanical and electrical runout (slow roll), which is critical for establishing a vibration baseline and ensuring the generator air gap is even.

Comparison with Competing Products

Selection Suggestions and Important Notes

• Selection Suggestion:

  • The BENTLY 330980-51-00 is selected as part of the design or maintenance specification for critical turbomachinery where continuous online monitoring and protection are required.

  • It is the standard choice for retrofitting or replacing probes in existing Bently Nevada 3300 XL 8mm systems. The probe sensitivity (-51-), length, and connector type must exactly match the original.

  • Always select the complete, matched system: probe, correct-length extension cable, and compatible driver module.

• Important Notes:

  • Matched System Imperative: Never mix probes and drivers from different manufacturers or with different sensitivities. The BENTLY 330980-51-00 probe must be used with a driver calibrated for its specific sensitivity (e.g., 200 mV/mil).

  • Proper Installation is Critical: The installation gap must be set correctly using a micrometer or gap calibration tool. Incorrect gap can lead to nonlinear response or damage. The probe must be mounted securely to prevent loosening from vibration.

  • Target Area Preparation: The shaft area under the probe tip must be clean, smooth, free of scratches, demagnetized, and made of the correct material. A poor target surface is a leading cause of unreliable signals.

  • Cable Integrity: The coaxial extension cable is part of the tuned circuit. It must not be spliced, cut, or run near sources of strong electromagnetic interference. Damaged cables will ruin system calibration and accuracy.

  • Safety: These are precision instruments. The probe tip is fragile and can be easily damaged by contact with the shaft during installation or maintenance. Handle with extreme care.

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