Bently Nevada 330930-065-04-00 – Armored Coaxial Extension Cable | 3300 NSv Proximity Probe System
Engineering Background: The Bently Nevada 3300 NSv series represents the industry benchmark for non-contacting eddy-current proximity measurement in rotating machinery protection. The extension cable is the critical signal-path link between the proximity probe tip and the Proximitor® sensor, carrying the raw oscillator signal with minimal attenuation and zero ground-loop interference. Selecting the correct cable length and termination is essential for system accuracy and API 670 compliance.
Product Positioning: Part number 330930-065-04-00 is a factory-assembled, armored coaxial extension cable rated for the 3300 NSv platform. The 065 segment encodes a 65 cm (approximately 2 ft) active length, making it the preferred choice for tight machinery housings, bearing pedestals, and skid-mounted compressor trains where cable routing space is constrained. It ships pre-terminated with the standard NSv push-on connectors and is fully interchangeable with legacy 3300 XL installations that have been migrated to NSv electronics.
Complete Technical Specifications
- Part Number: 330930-065-04-00
- Series / Platform: Bently Nevada 3300 NSv Proximity Probe System
- Cable Type: Armored coaxial (RG-type, low-loss)
- Active Cable Length: 65 cm (≈ 2.0 ft)
- Termination Style: NSv push-on coaxial connectors, both ends factory-crimped
- Characteristic Impedance: 50 Ω nominal
- Operating Temperature: –40 °C to +121 °C (–40 °F to +250 °F)
- Jacket Material: Stainless-steel armor over PTFE-insulated inner conductor
- Bend Radius (min.): 25 mm static / 50 mm dynamic
- Weight: 160 g (factory-measured)
- Compatible Probes: 3300 NSv 8 mm, 11 mm, 14 mm proximity probes
- Compatible Proximitor® Sensors: 3300 XL 8 mm, 3300 NSv series
- System Compliance: API 670 (5th Edition), ISO 10816, ISO 7919
- Approvals / Certifications: CE, cULus (per Bently Nevada system certification)
- Country of Origin: USA (Baker Hughes / Bently Nevada manufacturing)
Proven Application Environments
- Steam and gas turbine bearing vibration monitoring (radial & axial)
- Centrifugal compressor shaft displacement measurement
- Boiler feed pump and motor rotor position sensing
- Petrochemical plant rotating equipment protection systems
- LNG liquefaction train machinery health monitoring
- Power generation (nuclear, thermal, hydro) turbine supervisory instrumentation
- Offshore platform critical rotating machinery per API 670 mandates
Engineering Advantages
- Zero signal degradation: Factory-calibrated cable length ensures the Proximitor® sensor gap voltage curve remains within ±0.5% of specification.
- Armored construction: Stainless-steel braid provides EMI/RFI shielding >85 dB and mechanical protection against abrasion and crush loads in congested cable trays.
- Pre-terminated convenience: Eliminates field crimping errors; connectors are torque-tested and continuity-verified at the factory.
- Backward compatibility: Drop-in replacement for 330930-065-01-00 (3300 XL) installations upgraded to NSv electronics without re-routing cables.
- Chemical resistance: PTFE dielectric withstands hydrocarbon vapors, H₂S, steam condensate, and common industrial cleaning solvents.
System Architecture & Signal Flow
In a complete 3300 NSv proximity measurement loop, the signal path is:
Proximitor® Sensor → Extension Cable (330930-065-04-00) → Proximity Probe Tip → Target (shaft)
The Proximitor® drives a 1 MHz oscillator signal down the coaxial cable to the probe tip. The eddy-current field at the tip modulates the oscillator amplitude proportional to the gap distance. The demodulated DC output (–24 VDC nominal, –4 mV/µm sensitivity) is returned via the same cable shield to the monitor rack (e.g., 3500/40M or 3500/42M). Cable length is a calibrated system parameter; substituting a non-matched length will shift the linear range and void the system calibration.
Sourcing & Quality Verification
- All units sourced from authorized Baker Hughes / Bently Nevada distribution channels or verified surplus with full traceability documentation.
- Each cable undergoes incoming inspection: visual check of armor integrity, connector seating, and DC continuity/insulation resistance (>100 MΩ at 500 VDC).
- Serialized lot records retained for 7 years; certificate of conformance available on request.
- Counterfeit-risk mitigation: connector markings, cable jacket print, and crimp geometry verified against Bently Nevada OEM reference samples.
Procurement Process
- Lead Time: In-stock units ship within 1–3 business days (DHL Express / FedEx International Priority).
- MOQ: 1 piece; volume pricing available for orders ≥ 5 pieces.
- Export Compliance: EAR99 / No export license required for most destinations.
- Payment: T/T (wire transfer), PayPal, credit card via Shopify Payments.
- Documentation: Commercial invoice, packing list, CoC, and test report included with every shipment.
- Returns: 30-day return window for unused, uninstalled units in original packaging.
Technical FAQ
Q: Can I use this cable with a 3300 XL Proximitor® sensor?
A: Yes. The NSv extension cable is electrically and mechanically compatible with 3300 XL Proximitor® sensors. Verify the probe tip part number is also NSv-compatible for a fully matched system.
Q: What happens if I use a different cable length than specified?
A: The Proximitor® sensor is calibrated for a specific total cable capacitance. Using a non-specified length shifts the oscillator frequency and changes the output sensitivity, resulting in inaccurate gap readings and potential false trips. Always match the cable length to the system calibration sheet.
Q: Is the armor grounded at both ends?
A: No. The shield/armor is grounded at the Proximitor® end only (single-point grounding) to prevent ground loops that would introduce 50/60 Hz noise into the measurement signal.
Q: Do you provide a calibration certificate?
A: A factory certificate of conformance is included. Full system calibration (gap voltage curve) must be performed after installation using a Bently Nevada calibration fixture or the 3500 rack’s built-in self-test function.
Q: What is the shelf life of an unused cable?
A: Bently Nevada does not publish a formal shelf-life limit for this cable. Stored in original packaging at 15–35 °C and 5 years.
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