Shaft Vibration & Axial Displacement Solution – EPRO PR6424/014-120 CON021 | PR6424 Eddy Current Series
Rotating machinery protection demands micron-level precision. The EPRO PR6424/014-120 CON021 eddy current sensor delivers exactly that — a field-proven, non-contact measurement solution engineered for continuous shaft vibration and axial displacement monitoring in the world’s most demanding industrial environments. Procurement engineers and reliability teams specify this model when uptime is non-negotiable.
Where This Product Is Used
The PR6424/014-120 CON021 is deployed across a broad spectrum of rotating machinery protection applications:
- Steam & Gas Turbines — Continuous radial shaft vibration monitoring on HP/LP turbine stages; axial position measurement to detect thrust bearing wear before catastrophic failure.
- Centrifugal Compressors — Real-time rotor orbit tracking in petrochemical and LNG compression trains; integration with API 670-compliant protection systems.
- Large Electric Motors & Generators — Non-contact shaft displacement sensing on 2-pole and 4-pole machines in power generation and heavy industry.
- Pumps & Fans — Vibration trending on boiler feed pumps, cooling water pumps, and induced-draft fans in thermal power plants.
- Gearboxes — Shaft position monitoring on high-speed pinion shafts where contact sensors are impractical.
- Marine Propulsion Systems — Shaft line vibration surveillance on diesel-electric and steam-driven vessels.
- Offshore Platforms — Hazardous-area machinery protection on gas lift compressors and injection pumps.
Wherever rotating shafts must be monitored without physical contact, the PR6424 series — and this specific cable-length variant — is the engineer’s first choice.
Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | EPRO (Emerson) |
| Part Number | PR6424/014-120 |
| Conditioner / Extension Cable | CON021 |
| Sensor Type | Eddy Current (Non-Contact) |
| Measurement | Radial Shaft Vibration & Axial Displacement |
| Probe Tip Diameter | 14 mm |
| Cable Length | 120 inches (~3.05 m) integral cable |
| Sensitivity | 7.87 V/mm (200 mV/mil) nominal |
| Linear Range | 0.25 – 2.54 mm (10 – 100 mil) |
| Frequency Response | DC to 10 kHz (–3 dB) |
| Operating Temperature | –40°C to +120°C (probe); –40°C to +85°C (driver) |
| Supply Voltage | –24 VDC (nominal) |
| Output Voltage | –2 VDC to –18 VDC |
| Target Material | Steel / Stainless Steel (AISI 4140 reference) |
| Protection Rating | IP67 (probe assembly) |
| Approvals | ATEX / IECEx (Ex ia IIC T6 Ga) |
| Weight | ~300 g (probe + cable assembly) |
| Compatible Monitor | EPRO MMS 6000, Bently Nevada 3500 Series (with adapter) |
Why Engineers Specify This Model
- Exact Cable Length Match — The 120-inch (3.05 m) integral cable eliminates field splicing, preserving calibration integrity and signal quality from probe tip to driver input.
- 14 mm Probe Diameter — Optimized for mid-range shaft diameters (50–200 mm), providing a wider linear range than 8 mm probes without the installation footprint of 25 mm variants.
- CON021 Driver Compatibility — The matched CON021 signal conditioner ensures factory-calibrated sensitivity; no field recalibration required on replacement.
- Non-Contact Operation — Zero mechanical wear, no lubrication, no periodic replacement — ideal for continuous 24/7 protection duty.
- ATEX / IECEx Certified — Intrinsically safe for Zone 0 hazardous areas; meets the most stringent global installation requirements.
- API 670 Alignment — Fully compatible with API 670 5th Edition machinery protection system architecture.
- Drop-in Replacement — Direct OEM-equivalent replacement for installed PR6424/014-120 CON021 assemblies; no wiring or configuration changes required.
Complete System Bill of Materials
A complete EPRO eddy current measurement chain for one measurement point typically comprises:
- PR6424/014-120 — Eddy current probe with 120-inch integral cable (this item)
- CON021 — Signal conditioner / driver module (included or ordered separately)
- Extension Cable — PR9268/xxx series (if total cable run exceeds probe cable length)
- Monitor Module — EPRO MMS 6350 (vibration) or MMS 6312 (axial position), or Bently Nevada 3500/42M
- Rack / Chassis — EPRO MMS 6000 rack or Bently Nevada 3500 rack
- Mounting Hardware — Probe holder, lock nut, and bracket (machine-specific)
Contact [email protected] for complete BOM sourcing assistance.
Compliance & Industry Standards
- API 670 — Machinery Protection Systems, 5th Edition
- ATEX Directive 2014/34/EU — Equipment for explosive atmospheres (Ex ia IIC T6 Ga)
- IECEx IEC 60079 — International explosive atmospheres standard
- ISO 10816 / ISO 20816 — Mechanical vibration evaluation of machines
- IEC 61511 — Functional safety for process industry (SIL-capable installation)
- RoHS Compliant — Restriction of Hazardous Substances
Quality Assurance & Sourcing
Every EPRO PR6424/014-120 CON021 unit supplied by Konmask.com undergoes a rigorous verification process before dispatch:
- OEM Traceability — Units sourced through authorized EPRO/Emerson distribution channels with full supply chain documentation.
- Incoming Inspection — Physical verification of part number, date code, and label integrity against EPRO factory standards.
- Functional Pre-Check — Sensitivity and output voltage verified against EPRO calibration specifications using reference targets.
- Packaging Integrity — Anti-static, moisture-barrier packaging with shock-absorbing foam; probe tip protected by factory cap.
- Certificate of Conformance — Issued with every shipment; ATEX/IECEx certificates available on request.
- Warranty — 12-month warranty against manufacturing defects from date of shipment.
How to Source This Part
- Confirm Part Number — Verify PR6424/014-120 CON021 against your existing installation tag or EPRO system documentation.
- Submit Inquiry — Email [email protected] or call +0086 19859288691 with your required quantity and delivery timeline.
- Receive Quotation — Pricing, lead time, and availability confirmed within 24 business hours.
- Place Order — Purchase order accepted via email; proforma invoice issued for payment processing.
- Inspection & Dispatch — Unit inspected, documented, and shipped via DHL / FedEx with tracking; export documentation included for international orders.
- Commissioning Support — Technical guidance available for installation, gap-setting, and system integration at no additional charge.
Application-Specific FAQ
Q: Can the PR6424/014-120 CON021 replace a Bently Nevada 330104 probe directly?
A: Not as a direct plug-in replacement — the connector and driver are different. However, with the appropriate EPRO-to-BN adapter cable and driver substitution, the measurement chain can be made compatible. Contact our technical team for a compatibility assessment.
Q: What shaft material is required for accurate measurement?
A: The probe is factory-calibrated for AISI 4140 steel. For stainless steel, titanium, or other alloys, a material correction factor must be applied. EPRO provides material correction curves; Konmask can supply the relevant documentation.
Q: Is the 120-inch cable length fixed, or can it be extended?
A: The integral cable is fixed at 120 inches. Total system cable length (probe + extension) must not exceed the CON021 driver specification (typically 5 m or 9 m depending on driver version). Use PR9268 series extension cables for longer runs.
Q: What is the correct gap voltage for installation?
A: The nominal gap voltage is –10.0 VDC ± 0.5 V, corresponding to a physical gap of approximately 1.27 mm (50 mil) from the shaft surface. Verify with the EPRO installation manual for your specific monitor configuration.
Q: Can this sensor be used in a Zone 1 hazardous area?
A: Yes. The PR6424/014-120 CON021 carries ATEX/IECEx Ex ia IIC T6 Ga certification, making it suitable for Zone 0, 1, and 2 installations when installed per the applicable control drawing.
Q: What is the lead time for this part?
A: Standard lead time is 3–7 business days for in-stock units. For urgent requirements, expedited shipping is available. Contact [email protected] for real-time availability.
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