EPRO PR9268/301-000 Eddy Current Sensor | Replacement, Equivalent & Selection Guide
The EPRO PR9268/301-000 is a high-precision eddy current (proximity) sensor designed for non-contact displacement and vibration measurement in rotating machinery protection systems. This page provides full technical specifications, compatible replacement models, selection guidance, and sourcing information to help engineers and procurement teams make confident decisions.
Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | EPRO (Emerson) |
| Part Number | PR9268/301-000 |
| Sensor Type | Eddy Current / Proximity Sensor |
| Measurement Range | 0 – 8 mm (nominal) |
| Output Signal | Voltage (linear analog) |
| Supply Voltage | -24 VDC (via driver/oscillator) |
| Operating Temperature | -40°C to +120°C |
| Cable Length | Matched system (specify extension cable) |
| Thread / Housing | M14 × 1.5 (standard EPRO format) |
| Target Material | Steel / Inconel (ferromagnetic & non-ferromagnetic) |
| Ingress Protection | IP67 |
| Approvals | CE, ATEX (zone-dependent, verify datasheet) |
Note: Always verify specifications against the official EPRO/Emerson datasheet before installation.
Compatible Replacement & Equivalent Models
The following models are commonly evaluated as replacements or equivalents for the PR9268/301-000. Compatibility depends on system configuration, cable length, and driver pairing — always verify before substitution.
| Brand | Model | Compatibility Notes |
|---|---|---|
| EPRO (Emerson) | PR9268/200-000 | Shorter range variant; same driver interface |
| EPRO (Emerson) | PR9268/011-000 | Different cable length; verify system pairing |
| Bently Nevada | 330101-00-06-10-02-00 | 3300 XL series; functionally equivalent for most GE/BN systems |
| Bently Nevada | 330130-040-00-00 | Standard proximity probe; confirm driver compatibility |
| Metrix | ST5484E | Drop-in for many turbine monitoring applications |
| Wilcoxon / Amphenol | PC420 Series | Verify output scaling and gap voltage |
| DWYER / Generic OEM | Various M14 eddy current probes | Budget option; validate linearity and temperature range |
Important: Eddy current sensors must be used as a matched system (probe + extension cable + driver/oscillator). Mixing components from different manufacturers requires careful validation of sensitivity (mV/mm or mV/mil) and gap voltage.
Why Choose the Original Model
- System-certified accuracy: The PR9268/301-000 is factory-calibrated and matched to EPRO driver modules (e.g., PR9376, PR6423 series), ensuring ±1% linearity across the full measurement range.
- Proven reliability in critical machinery: Widely deployed in steam turbines, gas turbines, compressors, and pumps where API 670 compliance is required.
- Long-term availability: Emerson/EPRO maintains global spare parts support and traceability documentation.
- Regulatory compliance: Meets IEC 61511 / SIL requirements for safety-instrumented systems when used in certified configurations.
Typical Applications
- Shaft radial vibration monitoring (API 670)
- Axial thrust position measurement
- Differential expansion monitoring on steam turbines
- Rotor eccentricity and speed measurement
- Compressor and pump shaft displacement
- OEM machinery protection systems (GE, Siemens, MAN, Solar Turbines)
System Compatibility
The PR9268/301-000 is designed to integrate with the following monitoring and protection platforms:
- EPRO / Emerson: MMS 6000, MMS 3000, PR6423 driver series, PR9376 oscillator/driver
- Bently Nevada (GE): 3500 Series (with appropriate driver substitution and sensitivity matching)
- Emerson AMS 6500: Machinery Health Monitor — confirm firmware compatibility
- Third-party DCS/PLC: Compatible with any 4–20 mA or voltage-input card when used with a signal conditioner
Always confirm the sensitivity scale factor (typically 7.87 V/mm or 200 mV/mil) matches your monitoring system’s input configuration.
Selection Guide
Use the following criteria to select the correct EPRO PR9268 variant or a compatible replacement:
- Measurement range: PR9268/200-000 (0–5 mm) vs. PR9268/301-000 (0–8 mm) — choose based on expected shaft displacement.
- Cable length: The suffix (e.g., /301) encodes the extension cable length. Matched cable length is critical for calibration accuracy.
- Target material: Confirm whether the shaft is steel, stainless steel, or Inconel — sensitivity varies by material.
- Driver pairing: Always specify the driver/oscillator model when ordering. Mismatched drivers cause non-linearity and false trips.
- Environment: For high-temperature or ATEX Zone 1 applications, verify the sensor’s temperature rating and explosion-proof certification.
- API 670 compliance: If the application requires API 670 (machinery protection), use only OEM-certified matched systems.
Quality Assurance & Sourcing
- All units sourced by Konmask.com are inspected for physical integrity, connector condition, and labeling authenticity prior to dispatch.
- We supply new, surplus-new, and refurbished units — condition is clearly stated on each listing.
- Traceability documentation (manufacturer COC, test reports) available upon request for critical applications.
- Lead time: In-stock units ship within 1–3 business days; sourced units typically 5–15 business days.
- All international shipments comply with export control regulations (EAR/ECCN classification available on request).
How to Order
- Step 1: Confirm the exact part number (PR9268/301-000) and required condition (new / surplus / refurbished).
- Step 2: Specify quantity and required delivery date.
- Step 3: Contact us via email or phone for a formal quotation — we respond within 24 hours on business days.
- Step 4: Submit a Purchase Order (PO) or pay via secure online checkout.
- Step 5: Receive shipping confirmation with tracking number and documentation package.
For bulk orders (>5 units) or long-term supply agreements, please contact our sales team for preferential pricing.
Replacement & Compatibility FAQ
Q: Can I use a Bently Nevada 330101 probe as a direct replacement for the PR9268/301-000?
A: Functionally similar, but not a direct drop-in. Sensitivity (mV/mm), gap voltage, and driver interface must be verified. Cross-system use requires re-calibration of the monitoring system.
Q: What happens if I use a mismatched extension cable?
A: The eddy current system’s sensitivity and linearity are calibrated as a matched set (probe + cable + driver). Using a different cable length or brand will shift the output curve and may cause false alarms or missed trips.
Q: Is the PR9268/301-000 interchangeable with the PR9268/011-000?
A: The core sensor is the same, but the cable length differs. If your installation allows for the different cable routing, they can be interchanged — but the driver must be re-gapped and the system re-verified.
Q: Do you supply calibration certificates?
A: Yes, for new OEM units. For surplus stock, we can arrange third-party calibration upon request (additional lead time and cost apply).
Q: What is the minimum order quantity?
A: No minimum order quantity. Single units are available. Volume discounts apply for orders of 5+ units.
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