EPRO PR6423/014-040 CON021 – Eddy Current Proximity Vibration Sensor | EPRO Proximity System
Engineering Background
The EPRO PR6423 series represents the industry benchmark for non-contact eddy current proximity sensing in rotating machinery protection. Developed to meet the stringent demands of API 670-compliant machinery monitoring systems, the PR6423/014-040 CON021 is engineered for continuous, high-reliability measurement of shaft radial vibration, axial position, and differential expansion in turbomachinery and critical rotating equipment. EPRO (now part of Baker Hughes / Bently Nevada ecosystem) has decades of field-proven deployment across power generation, oil & gas, and petrochemical industries.
Product Positioning
This model is the preferred specification for engineers designing or maintaining machinery protection systems where measurement accuracy, signal integrity, and long-term stability are non-negotiable. The PR6423/014-040 CON021 integrates seamlessly with EPRO CON021 signal conditioning modules and is fully compatible with standard 5 mm eddy current probe driver systems operating at -24 VDC supply rails.
Complete Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | EPRO (Baker Hughes) |
| Part Number | PR6423/014-040 CON021 |
| Sensor Type | Eddy Current Proximity / Vibration Sensor |
| Probe Diameter | 14 mm |
| Cable Length | 040 (approx. 1.0 m integral cable) |
| Driver / Conditioner | CON021 compatible |
| Measurement Range | 0 – 2 mm (typical linear range) |
| Sensitivity | 8 mV/µm (nominal) |
| Supply Voltage | -24 VDC (via driver module) |
| Output Signal | DC voltage proportional to gap distance |
| Frequency Response | DC to 10 kHz (-3 dB) |
| Operating Temperature | -35°C to +120°C (probe tip) |
| Target Material | Ferromagnetic and non-ferromagnetic metals |
| Ingress Protection | IP67 (probe body) |
| Weight | 268 g (approx.) |
| Connector Type | Integral coaxial cable with MIL-spec connector |
| Compliance | API 670, CE, ATEX (zone-dependent configuration) |
Proven Application Environments
- Steam & Gas Turbines: Shaft radial vibration monitoring on HP/LP turbine stages; axial position measurement for thrust bearing protection.
- Centrifugal Compressors: Real-time rotor dynamic monitoring in pipeline compression and gas processing trains.
- Pumps & Fans: Continuous proximity measurement for critical BFW pumps, cooling water pumps, and forced-draft fans in power plants.
- Gearboxes: Gear mesh frequency analysis and shaft orbit monitoring in high-speed gearbox applications.
- Hydro Turbines: Slow-speed shaft monitoring where contact-type sensors are impractical.
- Marine Propulsion: Shaft alignment and vibration monitoring in ship propulsion systems.
- Petrochemical Reactors: Agitator shaft monitoring in hazardous area classified zones.
Engineering Advantages
- Non-Contact Measurement: Zero mechanical wear; no physical contact with rotating shaft eliminates sensor degradation over time.
- High Frequency Bandwidth: DC to 10 kHz response captures sub-synchronous, synchronous, and super-synchronous vibration components critical for machinery diagnostics.
- API 670 Compliance: Meets the international standard for machinery protection systems, ensuring acceptance by EPC contractors and end-user machinery engineers.
- Integral Cable Design: Eliminates field-assembled connector joints — a primary failure point in harsh industrial environments.
- Wide Temperature Range: Qualified for operation from cryogenic-adjacent cold starts to high-temperature turbine bearing housings.
- CON021 System Optimized: Factory-calibrated as a matched set with the CON021 driver, ensuring system-level accuracy without field calibration.
- Hazardous Area Ready: Available in ATEX-certified configurations for Zone 1/Zone 2 classified installations.
System Architecture & Signal Flow
The PR6423/014-040 CON021 operates as part of a three-component eddy current measurement chain:
- Probe (PR6423/014-040): Generates a high-frequency electromagnetic field at the probe tip. Eddy currents induced in the target shaft attenuate the field proportionally to the gap distance.
- Extension Cable: Transmits the high-frequency oscillator signal between probe and driver. Cable length is factory-matched to maintain system calibration — field-cut cables invalidate calibration.
- Driver / Conditioner (CON021): Contains the oscillator circuit, demodulator, and output amplifier. Converts the probe impedance change into a DC voltage output (typically -2 VDC to -18 VDC over the linear range) suitable for direct input to vibration monitors, PLCs, or DCS analog input cards.
Signal output is directly compatible with EPRO MMS 6000 series monitors, Bently Nevada 3500 series racks, and any 4–20 mA or ±10 VDC analog input module via appropriate signal conditioning.
Sourcing & Quality Verification
- OEM-Traceable Stock: All EPRO sensors at Konmask.com are sourced through verified industrial distribution channels with full traceability to authorized EPRO/Baker Hughes supply chains.
- Pre-Shipment Inspection: Each unit undergoes visual inspection, connector integrity check, and packaging verification before dispatch.
- Authenticity Guarantee: Counterfeit sensors are a known risk in the aftermarket. Konmask supplies only genuine EPRO parts — no grey-market or refurbished units.
- Documentation Package: Calibration certificates, material certificates, and country-of-origin documentation available upon request for regulated industries.
- Shelf Life Management: Stock is rotated on FIFO basis; no long-shelf-life units are dispatched without prior customer agreement.
Procurement Process
- Confirm Part Number: Verify PR6423/014-040 CON021 matches your existing system driver and cable configuration. Cross-reference with your machinery OEM documentation or existing probe datasheet.
- Request a Quote: Contact Konmask via email or phone for volume pricing, lead time confirmation, and availability check.
- Submit Purchase Order: Standard payment terms available for qualified industrial buyers. T/T, L/C, and trade finance options supported.
- Shipping & Export: Global shipping via DHL, FedEx, or freight forwarder. Export documentation (commercial invoice, packing list, COO) provided for customs clearance.
- Incoming Inspection Support: Konmask can provide technical support during your incoming goods inspection process.
Technical FAQ
Q: Can the PR6423/014-040 CON021 be used with a Bently Nevada 3500 rack?
A: Yes. The CON021 driver output is a standard DC voltage signal compatible with Bently Nevada 3500/40M and 3500/42M monitor modules when configured for voltage input. Verify input range compatibility with your specific monitor card.
Q: What is the difference between PR6423/014-040 and PR6423/014-060?
A: The numeric suffix after the slash indicates probe diameter and cable length. /014-040 = 14 mm probe diameter, 040 cable code (approx. 1.0 m). /014-060 = 14 mm probe, 060 cable code (approx. 1.5 m). System calibration is cable-length dependent — do not interchange cables between matched sets.
Q: Is field recalibration required after replacement?
A: When replacing a matched probe/cable/driver set with an identical factory-matched CON021 set, field recalibration is typically not required. However, always verify gap voltage at the installed gap distance against the system calibration record before returning the machine to service.
Q: What target materials are compatible?
A: The PR6423 is calibrated for AISI 4140 steel (standard shaft material). For non-standard target materials (stainless steel, titanium, Inconel), a material correction factor must be applied. Contact Konmask for application-specific guidance.
Q: Is ATEX certification available for this part number?
A: EPRO offers ATEX-certified variants of the PR6423 series. Confirm the specific ATEX marking and zone classification required for your installation before ordering. Konmask can source ATEX-certified units upon request.
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