EPRO PR6423/015-000 CON021 Eddy Current Vibration Probe | Replacement, Equivalent & Selection Guide
The EPRO PR6423/015-000 CON021 is a non-contact eddy current vibration probe engineered for continuous shaft displacement and vibration monitoring on rotating machinery. Designed to operate within the EPRO MMS 6000 / CON021 signal conditioning ecosystem, this probe delivers high-resolution, real-time measurements critical to predictive maintenance programs in power generation, oil & gas, and heavy industry.
Technical Specifications
- Manufacturer: EPRO (Baker Hughes / Bently Nevada compatible ecosystem)
- Part Number: PR6423/015-000
- Conditioner: CON021
- Sensor Type: Eddy Current (Non-contact)
- Probe Tip Diameter: 8 mm
- Cable Length: 1.5 m (standard; extension cable available)
- Measurement Range: 0–2 mm (linear range)
- Sensitivity: ~8 mV/µm (with CON021 conditioner)
- Output Signal: –24 VDC bias (standard Bently Nevada compatible)
- Operating Temperature: –40 °C to +120 °C
- Protection Rating: IP67
- Target Material: Ferromagnetic and non-ferromagnetic metals
- Weight: Approx. 1,120 g (probe + conditioner assembly)
- Compliance: CE, API 670
Compatible Replacement & Equivalent Models
When the original PR6423/015-000 CON021 is unavailable or discontinued, the following models offer functional or dimensional equivalence. Always verify conditioner compatibility and gap calibration before substitution.
- Bently Nevada 330101-00-06-10-02-00 — 3300 XL 8 mm probe; direct functional equivalent, same –24 V output, API 670 listed. Most common drop-in replacement.
- EPRO PR6423/010-000 CON021 — Shorter 1.0 m cable variant; identical tip and sensitivity. Use when cable routing space is limited.
- EPRO PR6423/020-000 CON021 — 2.0 m cable variant; preferred for large-frame turbines with extended probe-to-conditioner distance.
- EPRO PR6424/010-040 CON021 — 14 mm tip diameter; higher gap range (0–4 mm). Select when shaft diameter >100 mm or target surface is rough.
- Metrix ST5484E — Third-party equivalent; 8 mm eddy current, –24 V output. Suitable for non-API 670 applications where cost is a priority.
- Wilcoxon Research 786A — Accelerometer-based alternative; use only when converting from displacement to velocity/acceleration measurement.
⚠ Note: Always recalibrate the gap voltage after any probe substitution. Sensitivity coefficients differ between manufacturers.
Why Choose the Original Model
- System-Matched Calibration: PR6423/015-000 is factory-calibrated as a matched set with CON021 — no field recalibration required on installation.
- API 670 Compliance: Meets the full requirements of API Standard 670 (Machinery Protection Systems), mandatory for many refinery and power plant installations.
- Proven Field Reliability: Widely deployed across gas turbines, steam turbines, compressors, and pumps in over 60 countries.
- OEM Interchangeability: Direct plug-in replacement for existing EPRO MMS 6000 installations without wiring or conditioner changes.
- Extended Temperature Range: Rated to –40 °C, suitable for outdoor installations in cold climates without additional enclosure heating.
Typical Applications
- Shaft radial vibration monitoring on gas turbines and steam turbines
- Axial thrust position measurement on centrifugal compressors
- Differential expansion monitoring on large turbine-generator sets
- Rotor eccentricity measurement during slow-roll and startup
- Bearing journal orbit analysis in critical rotating equipment
- Keyphasor reference signal generation (with appropriate target)
System Compatibility
- Signal Conditioner: EPRO CON021 (required for matched-set operation)
- Monitoring Systems: EPRO MMS 6000, MMS 3000; Bently Nevada 3500 series (with adapter); GE Bently Nevada System 1
- DCS Integration: 4–20 mA output via CON021; compatible with ABB, Siemens, Honeywell, Emerson DeltaV
- Safety Systems: Compatible with SIL 2 loops when used with certified conditioner and voting logic
- Cable Extension: EPRO CON011 extension cable (up to 9 m total system length)
Selection Guide
Use the following criteria to select the correct PR6423 variant or equivalent:
- Cable Length: Measure probe-to-conditioner distance. Add 10–15% margin. Choose /010 (1 m), /015 (1.5 m), or /020 (2 m) accordingly.
- Tip Diameter: 8 mm (PR6423) for shafts 25–150 mm diameter. Use 14 mm (PR6424) for shafts >100 mm or rough surfaces.
- Target Material: Confirm shaft material (steel, stainless, Inconel). Non-ferromagnetic targets require sensitivity correction — consult EPRO calibration tables.
- Gap Setting: Standard installation gap: 1.0 mm (–10 V output). Verify with CON021 output voltage at commissioning.
- Environment: For temperatures >120 °C (e.g., near bearing housings), specify high-temperature variant PR6423/015-040.
- Regulatory Requirement: If API 670 is contractually required, do not substitute with non-listed equivalents.
Quality Assurance & Sourcing
- All EPRO PR6423/015-000 CON021 units supplied by Konmask.com are sourced from authorized distributors or verified surplus channels.
- Each unit undergoes incoming inspection: visual check, impedance verification, and output voltage test with reference conditioner.
- Traceability documentation (lot number, test report) available on request.
- Counterfeit risk mitigation: we do not source from unverified third-party marketplaces.
- Shelf life: unlimited for properly stored units (dry, anti-static, 15–30 °C).
How to Order
- Part Number: PR6423/015-000 CON021
- Manufacturer: EPRO
- Lead Time: In-stock units ship within 2 business days; ex-stock orders within 7–14 days.
- Minimum Order: 1 unit
- Packaging: Original EPRO packaging or equivalent anti-static protective packaging
- Export: Available for worldwide export. HS Code: 9031.80 (precision measuring instruments). Export license may be required for certain destinations.
- Contact: [email protected] | +0086 19859288691
- Request a Quote: Submit RFQ at Konmask.com
Replacement & Compatibility FAQ
Q: Can I replace PR6423/015-000 CON021 with a Bently Nevada 330101 probe?
A: Yes, functionally. Both use –24 V bias and 8 mm eddy current technology. However, sensitivity coefficients differ slightly (~7.87 vs 8.0 mV/µm). Recalibrate the gap and verify alarm setpoints after substitution.
Q: Is the CON021 conditioner included with the probe?
A: The PR6423/015-000 CON021 part number designates a matched probe-and-conditioner set. Confirm with your order whether both components are required or only the probe tip.
Q: Can this probe be used without the CON021 conditioner?
A: No. The PR6423 probe requires a compatible signal conditioner to provide the oscillator/demodulator circuit. It cannot output a usable signal standalone.
Q: What is the maximum cable extension length?
A: The total system cable length (probe cable + extension) must not exceed 9 m for the CON021 conditioner. Exceeding this affects linearity and sensitivity.
Q: How do I verify the probe is functioning correctly on installation?
A: With the CON021 powered and probe installed at the nominal 1.0 mm gap, the output should read –10 ±0.5 VDC. Deviation indicates incorrect gap, damaged probe, or conditioner fault.
Q: Is this probe suitable for use in hazardous (Ex) areas?
A: The standard PR6423/015-000 is not ATEX/IECEx certified. For hazardous area installations, specify the PR6423/015-040 (intrinsically safe variant) and verify with your safety engineer.
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