EMERSON PR6424/000-110 + CON021/914-100 – Non-Contact Eddy Current Proximity Probe & Extension Cable Assembly | Bently Nevada 3300 XL Series Platform
Engineering Background
The PR6424/000-110 is a high-precision eddy current proximity probe manufactured by EMERSON (Bently Nevada), engineered for continuous, non-contact measurement of shaft radial vibration, axial position, and differential expansion in rotating machinery. Operating within the proven Bently Nevada 3300 XL series ecosystem, this probe delivers sub-micron resolution and exceptional signal stability in the most demanding industrial environments.
Product Positioning
Designed for OEM integration and field replacement in critical turbomachinery protection systems, the PR6424/000-110 paired with the CON021/914-100 extension cable forms a factory-calibrated probe-cable assembly that interfaces directly with Bently Nevada 3300 series monitors. It is the preferred choice for procurement engineers requiring drop-in compatibility, traceable calibration, and long-term supply continuity.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number (Probe) | PR6424/000-110 |
| Part Number (Extension Cable) | CON021/914-100 |
| Manufacturer | EMERSON / Bently Nevada |
| Sensor Type | Eddy Current Proximity Probe (Non-Contact) |
| Series Platform | Bently Nevada 3300 XL |
| Measurement Function | Radial Vibration, Axial Position, Differential Expansion |
| Probe Tip Diameter | 8 mm (standard) |
| Linear Range | 0.25 mm – 2.25 mm (nominal) |
| Sensitivity | 7.87 V/mm (200 mV/mil) |
| Frequency Response | DC – 10,000 Hz (–3 dB) |
| Operating Temperature | –35°C to +120°C (probe body) |
| Supply Voltage | –24 VDC (nominal) |
| Output Signal | –2 VDC to –18 VDC (gap-dependent) |
| Cable Length (Extension) | 9.14 m (30 ft) – CON021/914-100 |
| Connector Type | 3-pin MIL-spec (probe end); BNC (driver end) |
| Ingress Protection | IP67 (probe body) |
| Approvals / Certifications | CE, ATEX (consult datasheet for zone classification) |
| Weight | Approx. 300 g (probe + cable assembly) |
| Target Material Compatibility | Steel, Stainless Steel, Inconel (standard calibration) |
Proven Application Environments
- Steam & Gas Turbines – Continuous shaft radial vibration monitoring per API 670
- Centrifugal Compressors – Axial thrust position measurement and surge detection
- Pumps & Fans – Bearing journal orbit analysis and imbalance detection
- Gearboxes – Gear mesh frequency monitoring and differential expansion tracking
- Hydro Turbines – Low-speed shaft runout and eccentricity measurement
- Marine Propulsion Systems – Shaft alignment verification and vibration trending
Engineering Advantages
- Non-Contact Measurement: Zero mechanical wear; suitable for continuous 24/7 operation without maintenance intervals
- Factory-Calibrated Assembly: Probe and extension cable calibrated as a matched pair, eliminating field calibration errors
- Wide Frequency Bandwidth: DC to 10 kHz response captures both slow-roll runout and high-frequency blade-pass events
- Robust EMI Immunity: Shielded coaxial cable construction rejects electrical noise in VFD-dense environments
- Direct Monitor Compatibility: Plug-and-play replacement for all Bently Nevada 3300 XL series monitors (3300/16, 3300/20, 3300/55, etc.)
- Hazardous Area Rated: ATEX-certified for use in Zone 1/Zone 2 classified areas
System Architecture & Signal Flow
The PR6424/000-110 operates as part of a three-component measurement chain:
- Proximity Probe (PR6424/000-110) – Generates a high-frequency electromagnetic field; gap changes modulate the oscillator circuit impedance
- Extension Cable (CON021/914-100, 9.14 m) – Transmits the modulated signal with minimal attenuation; total system cable length must remain within Bently Nevada specification (typically ≤ 9 m probe + extension combined)
- Proximitor / Monitor (3300 Series) – Demodulates the signal, outputs a DC voltage proportional to gap distance, and interfaces with the plant DCS/SIS via 4–20 mA or relay outputs
Note: Always verify total cable length against the specific Proximitor driver specification before installation. Mismatched cable lengths will shift the calibration curve and introduce measurement error.
Sourcing & Quality Verification
- All units sourced through authorized industrial distribution channels or verified surplus with full traceability documentation
- Each assembly inspected for: connector integrity, cable jacket condition, probe tip concentricity, and label/part number legibility
- Calibration certificates and original EMERSON packaging available upon request for new-in-box stock
- Counterfeit risk mitigation: Konmask performs visual and functional cross-checks against EMERSON factory specifications prior to dispatch
Procurement Process
- Confirm Compatibility: Verify your Proximitor driver model and total cable length budget before ordering
- Request Quote: Contact [email protected] with your required quantity, delivery timeline, and any certification requirements
- Order Confirmation: Purchase order accepted via email; proforma invoice issued within 1 business day
- Dispatch: Standard lead time 3–7 business days; expedited options available for critical shutdowns
- Documentation: Packing list, commercial invoice, and optional calibration certificate shipped with every order
Technical FAQ
Q: Can the PR6424/000-110 be used with non-Bently Nevada monitors?
A: The probe outputs a standard eddy current signal, but sensitivity and linearity are calibrated for Bently Nevada Proximitor drivers. Use with third-party monitors requires re-characterization of the calibration curve.
Q: What target materials require a special calibration?
A: Aluminum, titanium, and non-ferrous alloys require a material-specific calibration factor. Standard calibration is for AISI 4140 steel. Contact us if your shaft material differs.
Q: Is the CON021/914-100 extension cable field-replaceable independently?
A: Yes, but the replacement cable must be the same length and type as the original to maintain system calibration. Mixing cable lengths without recalibration will introduce gap measurement error.
Q: What is the maximum operating temperature for the extension cable?
A: The CON021 series extension cable is rated to +121°C continuous. For higher ambient temperatures, consult EMERSON for high-temperature cable variants.
Q: Do you provide installation support?
A: Konmask provides pre-sales technical consultation and installation documentation. On-site commissioning support can be arranged through our engineering partners.
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