Rotating Machinery Protection Solution — EPRO PR6423/003-030 CON021 | Eddy Current Vibration Sensor Series
Where This Product Is Used
The EPRO PR6423/003-030 CON021 is an eddy current (proximity) vibration sensor engineered for continuous shaft vibration and radial displacement monitoring in high-speed rotating machinery. It is deployed across the following critical industrial environments:
- Steam & Gas Turbines — shaft radial vibration monitoring per API 670 requirements in power generation plants
- Centrifugal Compressors — real-time rotor orbit and displacement measurement in petrochemical and LNG facilities
- Pumps & Blowers — early-warning vibration detection in water treatment, HVAC, and process industries
- Electric Motors (Large Frame) — bearing journal monitoring in steel mills and mining operations
- Gearboxes — shaft proximity sensing in wind turbine drivetrains and marine propulsion systems
- Expanders & Fans — axial and radial displacement in refinery and chemical plant rotating equipment
This sensor is a direct-fit replacement for legacy EPRO/Bently Nevada PR6423 series installations and integrates natively with EPRO CON021 signal conditioning modules and Bently Nevada 3500 series rack systems.
Technical Specifications
| Manufacturer | EPRO (GE Bently Nevada Compatible) |
| Part Number | PR6423/003-030 CON021 |
| Sensor Type | Eddy Current / Non-contact Proximity Probe |
| Probe Tip Diameter | 8 mm (standard) |
| Cable Length | 3 m (probe) + 30 m (extension cable) |
| Conditioner | CON021 (integrated driver/oscillator) |
| Measurement Range | 0 – 2 mm (linear range) |
| Sensitivity | 8 mV/µm (nominal) |
| Output Signal | –24 VDC bias, analog voltage proportional to gap |
| Supply Voltage | –24 VDC (±10%) |
| Operating Temperature | –50°C to +120°C (probe); –40°C to +85°C (conditioner) |
| Target Material | Steel / Iron (AISI 4140 reference) |
| Weight | 268 g (complete assembly) |
| Protection Rating | IP67 (probe body) |
| Connector | MIL-C-5015 / standard EPRO bayonet |
Why Engineers Specify This Model
- API 670 Compliant Architecture — meets the machinery protection standard mandated by EPC contractors and end-users in oil & gas and power generation
- Non-Contact Measurement — zero mechanical wear; ideal for continuous 24/7 monitoring without scheduled sensor replacement
- High Linearity — ±1% linearity over the full measurement range ensures accurate alarm and trip setpoint calibration
- Direct Bently Nevada 3500 Compatibility — CON021 conditioner output is pin-compatible with Bently Nevada 3500/40M and 3500/42M monitor cards, enabling drop-in upgrades
- Robust EMI Immunity — shielded coaxial cable construction rejects electrical noise in VFD-heavy and switchgear environments
- Extended Cable Reach — 30 m extension cable supports remote conditioner mounting away from high-temperature bearing housings
- Proven Field Reliability — PR6423 series has >20 years of installed base in critical rotating equipment globally
Complete System Bill of Materials
A fully functional eddy current monitoring loop using this sensor typically includes:
- PR6423/003-030 CON021 — Proximity probe + extension cable + conditioner (this item)
- Bently Nevada 3500/40M or 3500/42M — Proximitor monitor card (rack-mounted)
- Bently Nevada 3500/20 — Power supply module
- Bently Nevada 3500/22M — Transient data interface (optional, for waveform capture)
- Mounting hardware — Probe holder, lock nut, and bracket (application-specific)
- DCS/PLC interface — 4–20 mA or relay output to plant control system
Contact support@konmask.com for complete loop BOM quotations and compatibility verification.
Compliance & Industry Standards
- API 670 — Machinery Protection Systems (5th Edition)
- IEC 60079 — Equipment for explosive atmospheres (ATEX/IECEx variants available on request)
- ISO 10816 / ISO 20816 — Mechanical vibration evaluation of machines
- CE Marking — European conformity for industrial instrumentation
- RoHS Compliant — Restriction of Hazardous Substances
Quality Assurance & Sourcing
All EPRO PR6423 series sensors supplied by Konmask.com are:
- Sourced from authorized distributors and verified OEM supply chains
- Individually inspected for physical integrity, connector condition, and cable continuity prior to dispatch
- Supplied with original manufacturer documentation and traceability records where available
- Stored in ESD-safe, climate-controlled warehousing to preserve calibration integrity
- Backed by Konmask’s 90-day functional warranty on all stocked units
For projects requiring factory calibration certificates or third-party inspection (SGS, BV, TÜV), please specify at time of inquiry.
How to Source This Part
- Submit an RFQ — Email support@konmask.com with your required quantity, delivery timeline, and destination port
- Receive a quotation — We respond within 1 business day with pricing, lead time, and stock confirmation
- Place your order — Secure payment via T/T bank transfer, PayPal, or trade assurance platforms
- Shipping & logistics — DHL / FedEx express for urgent orders; sea freight consolidation available for bulk quantities
- After-sales support — Technical assistance for installation, loop calibration, and system integration
📞 WhatsApp / WeChat: +0086 19859288691
📧 Email: support@konmask.com
Application-Specific FAQ
Q: Is the PR6423/003-030 CON021 a direct replacement for Bently Nevada 330103 series probes?
A: Yes. The CON021 conditioner output is electrically compatible with Bently Nevada Proximitor systems. However, always verify gap voltage and sensitivity settings during commissioning.
Q: Can this sensor be used on non-ferrous targets (aluminum, titanium)?
A: The standard calibration is optimized for AISI 4140 steel. Non-ferrous targets will shift the sensitivity curve; a target-material correction factor or field recalibration is required.
Q: What is the maximum shaft speed this sensor can monitor?
A: The eddy current principle is frequency-independent for DC to several kHz. The PR6423 is suitable for machinery operating from 0 to 60,000+ RPM.
Q: Do you supply ATEX-certified versions for Zone 1 hazardous areas?
A: ATEX/IECEx variants of the PR6423 series are available. Please specify the hazardous area classification (Zone, gas group, temperature class) in your RFQ.
Q: Can Konmask provide installation and commissioning support?
A: We provide remote technical support for loop wiring, gap setting, and monitor card configuration. On-site support can be arranged through our partner network.
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Contact: support@konmask.com | +0086 19859288691
