Introduction
The EPRO 330103-00-04-20-02-00 is a specific configuration of an 8 mm Eddy Current Proximity Probe from the EPRO (Baker Hughes) PR 6423 series. This sensor is a fundamental component used for non-contact measurement of relative vibration and positional changes of rotating shafts in machinery protection systems.
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. This specific variant is defined by its very short 0.4-meter integrated cable and 2 mm linear range, making it suitable for applications with severe space constraints but requiring a wider measurement window.
Parameters / Specifications
The key technical specifications for the EPRO 330103-00-04-20-02-00 are summarized in the table below.
| Parameter | Specification |
|---|---|
| Part Number | 330103-00-04-20-02-00 |
| Product Line / Type | EPRO (Baker Hughes) PR 6423 Series 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 | 0.4 meters (This is a key interpretation of the -04 suffix in the part number). |
| Connector | Integrated, unconnectorized cable (This is a key interpretation of the -00 suffix). |
| Cable Type | Standard temperature cable (This is a key interpretation of the -20 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. 0.10 lbs (0.045 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 with a very short cable is designed for applications where space is extremely limited and the sensor is installed very close to the connection point.
Typical application scenarios include:
Radial Vibration Monitoring in Tight Spaces:
Mounted on bearing housings of turbines and compressors where clearance is minimal. The short cable is ideal when the probe is installed directly adjacent to a junction box or conduit entry point.
Axial Thrust Position Monitoring:
Mounted at the shaft end to monitor rotor axial movement. The 2mm linear range is well-suited for measuring the total float within thrust bearings, and the short cable is beneficial in cramped quarters at the machine end.
Internal Machine Monitoring:
Used within the casing of machinery where external space for cable routing is severely restricted. The short cable allows for connection to an internal terminal block or a pass-through connector.
OEM Applications with Integrated Junction Boxes:
Ideal for original equipment manufacturers who design their machines with built-in, pre-wired junction boxes located immediately next to the probe installation points.
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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