EMERSON PR6423/003-130 – Non-Contact Eddy Current Proximity Sensor | PR6423 Series
Engineering Background
The EMERSON PR6423/003-130 is a precision eddy current proximity probe engineered for continuous, non-contact vibration and displacement measurement in rotating machinery. Developed under the Bently Nevada instrumentation platform — now integrated into EMERSON’s condition monitoring portfolio — the PR6423 series has been the industry benchmark for turbomachinery protection systems for over three decades.
Product Positioning
Designed for procurement engineers specifying vibration monitoring hardware in power generation, oil & gas, petrochemical, and heavy industrial environments. The PR6423/003-130 delivers OEM-grade signal integrity compatible with Bently Nevada 3300 and 3500 series monitoring systems, making it the preferred drop-in replacement or new-installation choice for critical asset protection.
Complete Technical Specifications
| Part Number | PR6423/003-130 |
| Manufacturer | EMERSON (Bently Nevada) |
| Series | PR6423 |
| Sensor Type | Eddy Current / Inductive Proximity Probe |
| Tip Diameter | 8 mm |
| Cable Length | 5 m (standard extension cable) |
| Measurement Range | 0 – 2 mm (linear range) |
| Sensitivity | 7.87 V/mm (200 mV/mil) |
| Frequency Response | DC – 10,000 Hz |
| Supply Voltage | -24 VDC (nominal) |
| Output Signal | -2 VDC to -18 VDC (proportional to gap) |
| Operating Temperature | -35°C to +120°C |
| Target Material | AISI 4140 steel (standard); other ferrous/non-ferrous with calibration |
| Connector | MIL-C-5015 style, 2-pin |
| Housing Material | 316 Stainless Steel |
| IP Rating | IP67 |
| Weight | Approx. 200 g (probe + cable assembly) |
| Compatible Systems | Bently Nevada 3300 XL, 3500 Series, TDXnet |
| Certifications | CE, ATEX (consult datasheet for zone classification) |
Proven Application Environments
- Steam & Gas Turbines – Shaft radial vibration and axial position monitoring per API 670
- Centrifugal Compressors – Real-time rotor orbit and eccentricity measurement
- Pumps & Fans – Bearing housing displacement in high-temperature process environments
- Gearboxes – Gear mesh frequency analysis and shaft runout detection
- Electric Motors – Air-gap monitoring and rotor dynamic balancing
- Hydro Turbines – Low-speed shaft position and thrust measurement
Engineering Advantages
- Non-Contact Measurement – Zero mechanical wear; suitable for continuous 24/7 operation in critical machinery protection loops
- Wide Frequency Bandwidth – DC to 10 kHz response captures both static position and high-frequency vibration events
- OEM Signal Compatibility – Direct plug-in replacement for existing Bently Nevada PR6423 installations; no recalibration of monitor cards required
- Robust Stainless Steel Housing – 316 SS construction withstands aggressive process fluids, steam, and high-humidity environments
- IP67 Sealing – Fully protected against dust ingress and temporary immersion; suitable for wash-down and outdoor installations
- Extended Temperature Range – Operates reliably from -35°C to +120°C without signal drift
System Architecture & Signal Flow
The PR6423/003-130 operates as part of a three-component eddy current measurement chain:
- Proximity Probe (PR6423/003-130) – Generates a high-frequency electromagnetic field at the probe tip. Eddy currents induced in the conductive target attenuate the field proportionally to the gap distance.
- Extension Cable – The 5 m cable (included in /003-130 configuration) transmits the modulated signal with minimal impedance loss. Total system cable length must match driver calibration.
- Proximitor / Driver (e.g., CON021, 3300 XL 8mm) – Demodulates the probe signal and outputs a DC voltage proportional to gap: nominally -2 VDC at minimum gap to -18 VDC at maximum gap, with 200 mV/mil (7.87 V/mm) sensitivity.
Note: The complete measurement system (probe + cable + driver) must be purchased and calibrated as a matched set. Mixing components from different series may affect accuracy.
Sourcing & Quality Verification
- OEM Traceability – All units sourced through verified EMERSON/Bently Nevada authorized distribution channels or certified surplus with full documentation
- Incoming Inspection – Each unit undergoes dimensional verification, connector integrity check, and functional signal output test prior to dispatch
- Documentation Package – Certificate of conformance, original manufacturer datasheet, and test report available upon request
- Shelf Life – Stored in climate-controlled warehouse; ESD-safe packaging for all electronic assemblies
- Counterfeit Prevention – Serial number and date code verification against EMERSON product records; units with tampered markings are rejected
Procurement Process
- Confirm Compatibility – Verify your existing driver/proximitor model and cable length requirement before ordering. Contact our engineering team if unsure.
- Request Quote – Submit your PO number, required quantity, and delivery timeline via email or the contact form below.
- Lead Time – In-stock units ship within 1–3 business days. Special configurations or bulk orders: 5–10 business days.
- Shipping – DHL Express, FedEx International Priority, and sea freight available. Export documentation (CO, packing list, commercial invoice) included.
- Payment Terms – T/T (bank transfer), PayPal, and trade assurance accepted. Net-30 available for qualified accounts.
Technical FAQ
Q: Is the PR6423/003-130 compatible with the Bently Nevada 3500/42M monitor?
A: Yes. The PR6423 8mm probe with 5m extension cable is fully compatible with the 3500/42M Proximitor I/O module when used with the matching CON021 or 3300 XL 8mm driver. Verify the driver calibration range matches your target material.
Q: Can this probe measure non-ferrous targets such as aluminum or titanium?
A: Yes, with recalibration. The standard sensitivity of 200 mV/mil applies to AISI 4140 steel targets. Non-ferrous targets require a target-specific calibration curve. Contact us for calibration support.
Q: What is the difference between PR6423/003-130 and PR6423/003-030?
A: The suffix denotes cable length. /003-130 includes a 5 m (approximately 16.4 ft) extension cable; /003-030 includes a 1 m cable. The probe tip and electrical specifications are identical.
Q: Do you provide ATEX-certified units for hazardous area installations?
A: ATEX-certified variants are available. Please specify your zone classification (Zone 1/Zone 2) and gas group when requesting a quote.
Q: What warranty is provided?
A: 12-month warranty against manufacturing defects from date of shipment. Warranty does not cover damage from improper installation, over-range mechanical impact, or chemical exposure beyond rated limits.
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