Vibration Monitoring Solution – EPRO PR6423/004-010 | PR6423 Series
The EPRO PR6423/004-010 is a non-contact eddy current displacement sensor engineered for continuous shaft vibration and axial position monitoring in rotating machinery. Designed to operate within the EPRO MMS 6000 / CON 021 monitoring system ecosystem, this sensor delivers micron-level precision in the harshest industrial environments — from gas turbine bearing housings to high-speed centrifugal compressor trains.
Where This Product Is Used
The PR6423/004-010 is specified by rotating equipment engineers across the following critical applications:
- Gas & Steam Turbines — Radial shaft vibration monitoring at bearing pedestals; early detection of rotor imbalance, misalignment, and oil whirl instability.
- Centrifugal & Axial Compressors — Continuous proximity measurement to protect against surge events and rotor rub conditions.
- Pumps & Fans (API 670 installations) — Permanent installation in bearing housings for 24/7 condition monitoring per API 670 / ISO 10816 requirements.
- Gearboxes & Expanders — High-frequency response captures gear mesh frequencies and sub-synchronous instabilities.
- Power Generation (OEM Skids) — Factory-integrated into turbine control panels as the primary vibration transducer feeding DCS/SCADA systems.
- Petrochemical & Refinery Trains — SIL-rated monitoring loops where sensor reliability directly impacts process safety integrity.
Technical Specifications
| Manufacturer | EPRO (Baker Hughes / Bently Nevada compatible ecosystem) |
| Part Number | PR6423/004-010 |
| Series | PR6423 |
| Sensor Type | Eddy Current (Non-contact Proximity / Displacement) |
| Cable Length | 4 m (integral cable) |
| Tip Diameter | 8 mm |
| Measuring Range | 0 – 2 mm (nominal linear range) |
| Sensitivity | 8 mV/µm (with CON 021 driver) |
| Frequency Response | DC – 10 kHz (–3 dB) |
| Operating Temperature | –40 °C to +120 °C (sensor tip) |
| Target Material | Steel / Stainless Steel (AISI 4140 / 316 SS) |
| Housing Material | Stainless Steel, IP67 rated |
| Connector | Integral coaxial cable with MIL-spec connector |
| Compatible Driver / Extension | EPRO CON 021 / PR9376 extension cable |
| Supply Voltage | –24 VDC (via driver/monitor) |
| Output Signal | –2 VDC to –18 VDC (proportional to gap) |
| Weight | ~300 g |
Why Engineers Specify This Model
- Non-contact measurement — Zero mechanical wear; suitable for continuous, uninterrupted operation across multi-year maintenance intervals.
- High linearity & repeatability — Micron-level resolution ensures accurate alarm and trip setpoint discrimination in API 670 protection systems.
- Wide temperature tolerance — Operates reliably in bearing housings where ambient temperatures routinely exceed 100 °C.
- Drop-in compatibility — Direct replacement for existing PR6423/004-010 installations; no recalibration of the CON 021 driver required when replacing like-for-like.
- Integral cable design — Eliminates field-side connector joints that are a common failure point in vibration sensor installations.
- Proven field history — The PR6423 series has accumulated millions of operating hours in LNG, refinery, and power generation assets globally.
Complete System Bill of Materials
A fully functional eddy current monitoring channel using the PR6423/004-010 typically requires the following components:
- Sensor: EPRO PR6423/004-010 (this item)
- Extension Cable: EPRO PR9376/xxx-xxx (length to suit installation; 5 m standard)
- Driver / Oscillator: EPRO CON 021/916-120 or CON 021/916-130
- Monitor Module: EPRO MMS 6110 (radial vibration) or MMS 6120 (axial position)
- Rack / Backplane: EPRO MMS 6000 series rack with appropriate power supply
- Mounting Hardware: M8 × 1.0 threaded boss (customer-supplied, per EPRO installation drawing)
Contact support@konmask.com to source complete channel kits or individual replacement components.
Compliance & Industry Standards
- API 670 — Machinery Protection Systems (5th Edition): sensor meets transducer performance requirements for radial vibration and axial position channels.
- ISO 10816 / ISO 20816 — Mechanical vibration evaluation of machines; sensor output compatible with vibration severity assessment per these standards.
- IEC 61511 / IEC 61508 — Functional safety: suitable for use in SIL-rated monitoring loops when integrated with certified monitor modules.
- ATEX / IECEx — Consult EPRO documentation for zone classification; intrinsically safe variants available for hazardous area installations.
- RoHS Compliant — Materials comply with EU Directive 2011/65/EU on restriction of hazardous substances.
Quality Assurance & Sourcing
Konmask.com sources the PR6423/004-010 through established industrial automation supply channels. Every unit dispatched undergoes the following quality checks:
- Visual inspection of sensor tip, housing, and integral cable for physical damage
- Verification of part number label and date code against order documentation
- Packaging integrity check — anti-static bag, foam-lined carton, and desiccant pack
- Certificate of conformance (CoC) available upon request for regulated installations
We do not sell counterfeit, refurbished-as-new, or unverified grey-market stock. If a unit does not meet your incoming inspection criteria, we offer a straightforward return and replacement process.
How to Source This Part
- In-stock orders: Add to cart and check out — standard lead time is 3–7 business days for international shipments.
- Urgent / AOG requirements: Email support@konmask.com with your required delivery date; we will confirm stock and expedited freight options within 4 business hours.
- Bulk / project quantities: Request a formal quotation for orders of 5+ units; volume pricing and consignment stocking arrangements available.
- Cross-reference / alternate part: If you are sourcing a compatible replacement for a Bently Nevada 3300 XL 8 mm or Metrix ST5484E, contact us to confirm interchangeability for your specific driver and monitor combination.
- Export & customs: We handle export documentation (commercial invoice, packing list, HS code 9026.80) for all international shipments. DDP (Delivered Duty Paid) terms available for select destinations.
Application-Specific FAQ
Q: Can the PR6423/004-010 be used with a Bently Nevada 3500 monitor?
A: The PR6423 series uses EPRO’s proprietary driver (CON 021). While the output voltage range is similar to Bently Nevada 3300/3500 series sensors, direct interchangeability depends on the specific monitor input card and calibration. We recommend confirming compatibility with your instrumentation engineer before substitution in a live protection system.
Q: What is the maximum shaft speed this sensor can monitor?
A: The PR6423/004-010 has a flat frequency response to 10 kHz (–3 dB), making it suitable for monitoring shaft speeds up to approximately 600,000 RPM in terms of fundamental frequency. For most turbomachinery applications (3,000–20,000 RPM), the sensor captures fundamental, 2× and higher harmonics with full fidelity.
Q: Do I need to recalibrate the CON 021 driver when replacing a like-for-like PR6423/004-010?
A: No. The PR6423/004-010 is a factory-calibrated sensor matched to the CON 021 driver. A like-for-like replacement does not require driver recalibration, provided the extension cable length remains unchanged. Always verify gap voltage after installation per EPRO commissioning procedures.
Q: Is this sensor suitable for axial position (thrust) monitoring?
A: Yes. The PR6423/004-010 can be used for both radial vibration and axial position measurement. For axial position applications, pair with the EPRO MMS 6120 axial position monitor module.
Q: What target material is required for accurate measurement?
A: The sensor is calibrated for AISI 4140 steel. Measurements on stainless steel (316 SS) or other alloys will introduce a scale factor error. EPRO provides target material correction factors in the CON 021 technical manual. Contact us if you require a sensor calibrated for a non-standard target material.
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