Introduction
The EPRO 330104-00-08-50-02-00 is a specific configuration of an 8 mm Eddy Current Proximity Probe from the EPRO (Baker Hughes) machinery condition monitoring system. This sensor is designed for non-contact measurement of relative vibration and positional changes of rotating shafts.
Operating on the eddy current principle, the probe generates an electromagnetic field at its tip. When this field interacts with a conductive target (such as a machine shaft), eddy currents are induced. The sensor measures the change in the field's strength to precisely determine the distance to the target, allowing it to monitor both dynamic motion (vibration) and static position (e.g., shaft runout, thrust position). This specific variant features a 1.0-meter integrated cable and a 2 mm linear range, making it suitable for applications requiring a wider measurement window in standard industrial environments.
Parameters / Specifications
The key technical specifications for the EPRO 330104-00-08-50-02-00 are summarized in the table below.
| Parameter | Specification |
|---|---|
| Part Number | 330104-00-08-50-02-00 |
| Product Line / Type | EPRO (Baker Hughes) Eddy Current Proximity Probe |
| Probe Diameter | 8 mm |
| Thread Size | M10 x 1.0 |
| Sensitivity | -8.0 V/mm (± 5%) / -200 mV/mil |
| Linear Range | 2.0 mm (This is a key interpretation of the -02 suffix, e.g., 1.0 mm to 3.0 mm). |
| Operating Temperature | -35°C to +150°C (-31°F to +302°F) for probe; -35°C to +120°C for cable |
| Power Supply | Provided by the connected proximitor (e.g., -24 V DC from PR 6426) |
| Output Signal | A modulated RF signal requiring a dedicated proximitor for demodulation. |
| Cable Length | 1.0 meter (This is a key interpretation of the -08 suffix in the part number). |
| Connector | Integrated, unconnectorized cable (This is a key interpretation of the -00 suffix). |
| Cable Type | High-temperature cable (This is a key interpretation of the -50 suffix). |
| Mounting Thread | M10x1 (This is a key interpretation of the -00 suffix at the end). |
| Dimensions (Probe) | Body Diameter: 8 mm; Thread: M10 x 1.0; Length is application-specific. |
| Weight (Probe only) | Approx. 0.11 lbs (0.05 kg) |
Note: This sensor must be used with a compatible proximitor (e.g., EPRO PR 6426) to form a complete and functional measuring chain.
Application Scenarios
This 8 mm eddy current probe is a versatile sensor used extensively for condition monitoring in industries where the reliability of high-speed rotating equipment is paramount.
Typical application scenarios include:
Radial Vibration Monitoring on Turbines and Compressors:
Mounted on bearing housings to measure the vibration of the shaft relative to the housing. This is essential for detecting unbalance, misalignment, and oil whirl in gas/steam turbines and centrifugal compressors. The 2mm range offers a wider measurement window.
Axial Thrust Position Monitoring:
Mounted at the shaft end to monitor the axial movement (rotor position) to prevent catastrophic thrust bearing failure. The 2mm linear range is well-suited for measuring the total float of a rotor within its thrust bearings.
Eccentricity (Slow-Roll) Monitoring:
Used to measure the bow or bend in a large turbine or generator shaft when it is rotating at very low speeds (e.g., during startup or coast-down), before the hydrodynamic bearing film is fully established.
Keyphasor® / Timing Reference:
Used with a once-per-revolution notch on the shaft to provide a Keyphasor signal for measuring phase angle, which is vital for balancing machinery and analyzing vibration modes.
Industries of Use:
Oil & Gas (Pipeline compressors, gas turbines)
Power Generation (Gas, steam, and hydro turbines)
Petrochemical & Refining
Marine (Main propulsion turbines)
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