Introduction
The EPRO 330104-00-08-10-01-05 is a specific configuration of an 8 mm Eddy Current Proximity Probe, a fundamental sensor within the EPRO (now part of 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. Changes in the distance between the probe tip and the shaft alter the strength of these currents, which is detected by the probe. This signal is transmitted to a separate proximitor (e.g., PR 6426) for conditioning. This specific variant, indicated by the -08 suffix, features a 1-meter integrated cable, making it suitable for installations where the sensor is close to the junction box or monitoring equipment.
Parameters / Specifications
The key technical specifications for the EPRO 330104-00-08-10-01-05 are summarized in the table below.
| Parameter | Specification |
|---|---|
| Part Number | 330104-00-08-10-01-05 |
| 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 | 0.8 mm (0.8 to 1.6 mm from probe tip) / 80 mils (80 to 160 mils) |
| 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). |
| Mounting Thread | M10x1 (This is a key interpretation of the -05 suffix). |
| 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. The -10 suffix typically specifies a standard temperature rating, and -01 may indicate a specific calibration.
Application Scenarios
This 8 mm eddy current probe is a critical component for condition monitoring in industries where the reliability of high-speed rotating equipment is paramount. It is used to measure Relative Vibration and Axial Position.
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.
Axial Thrust Position Monitoring:
Mounted at the shaft end to monitor the axial movement (rotor position) to prevent catastrophic thrust bearing failure, which is a common and severe fault in turbines and compressors.
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.
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).
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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