Introduction
The EPRO 330101-00-68-10-12-05 is a specific model of a Proximitor Transducer, a crucial signal conditioning unit in the EPRO (now part of Baker Hughes) machinery condition monitoring system. This device works in tandem with an eddy current proximity probe (like the PR 6423 series) to form a complete vibration and displacement measurement chain.
While the probe senses the distance to a rotating shaft, the proximitor is the brain that powers the probe, demodulates its high-frequency RF signal, and converts the gap information into stable, standardized DC voltage outputs. These outputs represent both dynamic vibration (AC voltage) and static position (DC gap voltage). This specific model, with its -68 suffix, is characterized by a 10-meter integrated cable, making it suitable for installations where the sensor is located a significant distance from the monitoring system.
Parameters / Specifications
The key technical specifications for the EPRO 330101-00-68-10-12-05 are summarized in the table below.
| Parameter | Specification |
|---|---|
| Part Number | 330101-00-68-10-12-05 |
| Product Line / Type | EPRO (Baker Hughes) Proximitor Transducer (e.g., PR 6426 series) |
| Function | Signal Conditioner for 8 mm Eddy Current Probes |
| Compatible Probes | 8 mm Eddy Current Probes (e.g., PR 6423 series) |
| Input Power | Typically +24 V DC |
| Output Signals | Vibration/Displacement: -1 to -11 V DC (or -2 to -22 V DC) proportional to gap. Gap Voltage: A separate DC voltage proportional to the average gap. |
| Linear Range | 2 mm (This is a key interpretation of the -12 suffix, e.g., 1.0 mm to 3.0 mm). |
| Frequency Response | 0 to 10 kHz (-3 dB) |
| Operating Temperature | -35°C to +85°C (-31°F to +185°F) |
| Integrated Cable Length | 10.0 meters (This is a key interpretation of the -68 suffix). |
| 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). |
| Housing Dimensions (Approx.) | Compact metal enclosure, typically around 80 mm x 60 mm x 40 mm (L x W x H). |
| Weight (Approx.) | 0.66 lbs (0.3 kg) |
Note: This proximitor requires a compatible 8 mm eddy current probe and a suitable power supply to form a complete measuring chain. The -10 suffix typically specifies a standard temperature rating.
Application Scenarios
This proximitor transducer is designed for continuous, real-time monitoring of radial vibration, axial position, and speed on critical rotating machinery. Its long integrated cable makes it ideal for challenging installations.
Typical application scenarios include:
Turbine Supervisory Instrumentation (TSI):
Mounted on the bearing housings of gas and steam turbines to provide conditioned vibration and position signals to the main protection system. The long cable allows flexible routing from the sensor to the junction box or monitoring rack.
Compressor Monitoring in Remote Locations:
Used on large pipeline and process compressors, especially where sensors are located far from the central control cabinet. The integrated 10-meter cable reduces the number of connections, improving reliability.
Axial Thrust Position Monitoring:
Mounted at the shaft end of turbines and compressors to monitor rotor axial movement. The 2mm linear range is well-suited for measuring the total float within thrust bearings, providing critical protection against catastrophic failure.
Shaft Eccentricity Monitoring:
Used to measure slow-roll (eccentricity) of a turbine shaft at low speeds (during startup or coast-down) to detect a bend or bow before the machine reaches full speed.
Industries of Use:
Power Generation (Thermal, Nuclear, and Hydroelectric plants)
Oil & Gas (Upstream, Midstream, and Downstream)
Petrochemical & Chemical Industries
Heavy Industrial Manufacturing
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