Vibration Monitoring Solution – Bently Nevada 330930-040-04-CN | 3300 Series Proximity Probe Extension Cable
Where This Product Is Used
The Bently Nevada 330930-040-04-CN Extension Cable is a critical interconnect component in continuous machinery protection and condition monitoring systems. It is deployed in the following industrial environments:
- Power Generation: Steam turbines, gas turbines, and hydro generators where shaft vibration and axial position must be monitored 24/7 to prevent catastrophic failure.
- Oil & Gas Processing: Compressor trains, centrifugal pumps, and expanders on upstream and downstream platforms where SIL-rated protection loops are mandatory.
- Petrochemical & Refining: Reactor feed pumps, cracked-gas compressors, and blower trains operating under API 670 machinery protection requirements.
- Pulp & Paper / Heavy Industry: High-speed rotating equipment where proximity probe systems replace contact sensors to eliminate wear and extend MTBF.
- Marine & Offshore: Propulsion shaft monitoring and auxiliary machinery protection on FPSO vessels and offshore platforms.
In each application, the extension cable bridges the gap between the proximity probe (mounted at the machine) and the Proximitor® sensor (mounted in the junction box or rack), completing the eddy-current measurement loop with zero signal degradation.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 330930-040-04-CN |
| Series | Bently Nevada 3300 Series |
| Cable Type | Extension Cable (Proximitor® to Probe) |
| Cable Length | 4.0 m (13.1 ft) — suffix -040 = 40 dm |
| Connector Style | -04 = Standard coaxial connector, CN = China market variant |
| Impedance | Matched to 3300 Series system (50 Ω nominal) |
| Temperature Range | –40 °C to +85 °C (operating) |
| Jacket Material | Armored / shielded coaxial, oil-resistant outer jacket |
| Compatible Probes | 3300 XL 8mm, 3300 5mm, 330780, 330900 series |
| Compatible Proximitors | 3300 XL, 3300 RAM, 330180, 330185 |
| Weight | ~200 g |
| Country of Origin | USA (Baker Hughes / Bently Nevada) |
Why Engineers Specify This Model
- Exact Length Match: The 4 m (-040) length is the most common field-replacement length for turbine bearing pedestals and compressor skids, eliminating field-trimming and impedance mismatch errors.
- CN Variant Compliance: The -CN suffix denotes a configuration validated for Chinese national standards and documentation, simplifying customs clearance and local inspection.
- System Integrity: Using OEM-specified extension cables preserves the calibrated gap voltage vs. distance curve of the full probe system — third-party cables can introduce ±5–15% measurement error.
- Drop-In Replacement: Identical pin-out and impedance to the original factory cable; no recalibration of the Proximitor® required after swap.
- Harsh Environment Rating: Oil-resistant jacket and armored construction withstand lube oil splash, steam condensate, and mechanical vibration in turbine enclosures.
Complete System Bill of Materials
A complete Bently Nevada 3300 Series proximity probe measurement chain typically includes:
- Proximity Probe: e.g., 330780-50-00 (8 mm, 5 m integral cable) or 330900-50-00
- Extension Cable: 330930-040-04-CN (this item — 4 m)
- Proximitor® Sensor: e.g., 330180-91-00 or 330185-02-00
- Barrier / Zener Barrier (for hazardous area installations)
- 3500 or 3300 Monitor Rack: e.g., 3500/42M Proximitor® Monitor
- Signal Conditioning Cable to DCS/PLC input card
Contact Konmask.com to source the complete loop as a verified matched set.
Compliance & Industry Standards
- API 670 — Machinery Protection Systems (5th Edition): Extension cables must be OEM-supplied or OEM-approved to maintain system certification.
- IEC 61511 / IEC 61508 — Functional Safety: SIL-rated protection loops require traceable, calibrated sensor components.
- ATEX / IECEx — Intrinsically safe variants available; confirm hazardous area classification before ordering.
- GB/T Standards — CN variant documentation supports Chinese national inspection and acceptance testing.
Quality Assurance & Sourcing
- All units sourced from authorized distribution channels or verified OEM-surplus with full traceability documentation.
- Pre-shipment inspection includes visual check, connector integrity test, and continuity/impedance verification.
- Packaging preserved in original or equivalent ESD-safe, moisture-barrier packaging.
- Certificate of Conformance (CoC) and test report available upon request.
- Shelf-life managed: no units older than 3 years from manufacture date shipped without customer approval.
How to Source This Part
- Add to Cart directly on this page for standard lead time (typically 3–7 business days ex-warehouse).
- Request a Quote for volume orders (5+ units) or matched probe-cable-Proximitor® sets — email [email protected].
- Urgent / AOG Orders: Call +0086 19859288691 for same-day shipping assessment.
- Export Orders: We handle CN customs documentation, HS code 8544.42, and commercial invoice for international buyers.
Application-Specific FAQ
Q: Can I use a 330930-040-04-CN with a 3500 Series monitor?
A: Yes. The 3300 Series probe system (probe + extension cable + Proximitor®) is fully compatible with 3500 Series monitor racks. The extension cable is part of the sensor loop, not the monitor interface.
Q: What happens if I use a non-OEM extension cable?
A: Non-OEM cables may alter the total cable capacitance and resistance, shifting the gap voltage curve. This can cause false vibration readings or trip setpoint errors — a critical risk in API 670 protection systems.
Q: Is the -CN variant different electrically from the standard version?
A: No. The -CN suffix is a documentation and market variant designation only. Electrical and mechanical specifications are identical to the standard 330930-040-04-00.
Q: Do you supply calibration certificates?
A: We supply CoC and available factory test data. Full system calibration should be performed by a certified instrumentation technician after installation per Bently Nevada installation manual 141536-01.
Q: What is the total system cable length limit?
A: The 3300 Series system supports a maximum total cable length (probe integral cable + extension cable) of 9 m for standard configurations. The 4 m extension is compatible with 5 m integral-cable probes at this limit.
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