Overview
Configured for non-contact shaft displacement and vibration measurement in turbine supervisory instrumentation (TSI) systems, the EPRO PR6426/010-130 (PR6426 eddy current proximity sensor) provides direct measurement of relative target movement on rotating machinery.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | PR6426/010-130 |
| Brand | EPRO (Emerson) |
| Origin | Germany |
| Product Type | Eddy Current Proximity Sensor / Transducer System |
| Sensor Head Diameter | 32 mm |
| Measuring / Linear Range | Typically 0 mm to 8 mm; up to 24 mm depending on configuration |
| Frequency Response | 0 to 20,000 Hz (-3 dB) |
| Operating Temp | -35 deg C to +180 deg C for sensor/probe element |
| Primary Application | Rotating machinery vibration, position, and speed monitoring |
| Typical Machinery | Steam turbines, compressors, generators, and other rotating equipment |
Eddy Current Measurement Characteristics
The PR6426 uses a non-contact electromagnetic measurement principle. The probe detects changes in the electrical characteristics of a conductive target as the target-to-probe gap changes.
The sensor therefore supports measurement of relative shaft movement without mechanical contact between the probe and rotating surface. This arrangement avoids direct probe wear caused by shaft rotation.
For machinery monitoring, the measured gap variation can represent radial shaft vibration, axial position, or eccentricity when the probe installation and associated signal-conditioning configuration match the measurement task.
The supplied data specifies a frequency response of 0 to 20,000 Hz at -3 dB. This bandwidth supports measurement of dynamic shaft movement within the stated response range.
The 32 mm sensor head provides the stated mechanical interface size. However, the supplied information does not define mounting thread, cable length, connector type, probe material, or exact target material requirements.
Frequently Asked Questions
Q: What measurement principle does the PR6426/010-130 use?
A: It uses non-contact eddy current measurement to detect changes in the gap between the sensor and a conductive rotating target.
Q: What is the specified frequency response?
A: The supplied specification states 0 to 20,000 Hz with a -3 dB response limit.
Q: Can the sensor measure shaft vibration and position?
A: The supplied application data identifies vibration, position, and speed monitoring on rotating machinery. The exact measurement function depends on the probe installation and associated monitoring configuration.
Field Installation Guidelines
- Install the probe with its sensing axis directed toward the intended conductive measurement target.
- Maintain the specified mechanical gap required by the complete PR6426 measurement configuration. Do not assume a nominal gap from the model number alone.
- Keep the probe cable separated from high-current power wiring and strong electromagnetic interference sources where practical.
- Route signal wiring securely to prevent mechanical movement, abrasion, or excessive bending at the probe connection.
- Apply cable shielding and grounding according to the associated EPRO monitoring system and site electrical design.
- Verify the probe position and signal response before placing the monitored machinery into normal operation.
- Confirm the installed sensor configuration against the applicable system documentation before commissioning.
- Do not infer hazardous-area certification, thread dimensions, cable construction, or electrical supply requirements from the supplied model information alone.
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