BENTLY NEVADA BA21747-045-01 – Standard Extension Cable | 3500 Series Proximity Transducer System
Engineering Background
The Bently Nevada 3500 Series is the industry benchmark for continuous machinery protection in rotating equipment applications — turbines, compressors, pumps, and motors operating in critical process environments. The BA21747-045-01 Standard Extension Cable is a precision-engineered interconnect component within the 3500 Series proximity transducer system, designed to bridge the gap between the proximitor/driver and the eddy-current probe with zero signal compromise.
Product Positioning
This extension cable is a direct OEM-specification replacement and system-expansion component for engineers maintaining or commissioning Bently Nevada 3500 Series vibration monitoring systems. It is the correct selection when the standard probe cable length is insufficient for the installation geometry, and when signal integrity over the full transducer chain must be preserved to API 670 standards.
Complete Technical Specifications
| Part Number | BA21747-045-01 |
| Manufacturer | Bently Nevada (Baker Hughes) |
| Series | 3500 Proximity Transducer System |
| Component Type | Standard Extension Cable |
| Cable Length | 4.5 m (14.76 ft) — suffix -045 denotes 4.5 m |
| Connector Type | MIL-spec coaxial, male/female, gold-plated contacts |
| Impedance | Matched to 3300/3500 Series transducer chain (nominally 50 Ω system) |
| Operating Temperature | –40 °C to +85 °C (–40 °F to +185 °F) |
| Shield | Double-shielded coaxial construction for EMI/RFI rejection |
| Jacket Material | Polyurethane (PUR) — oil, chemical, and abrasion resistant |
| Approvals / Compliance | CE, RoHS; compatible with API 670 machinery protection requirements |
| Weight | Approx. 200 g |
| SKU | BA21747-045-01 |
Proven Application Environments
- Steam and gas turbine vibration monitoring (radial and axial displacement)
- Centrifugal and reciprocating compressor shaft monitoring
- Boiler feed pump and cooling water pump protection systems
- Gearbox and motor bearing proximity measurement chains
- Offshore platform and FPSO rotating equipment protection
- Petrochemical, refinery, and LNG plant machinery monitoring
- Power generation (nuclear, thermal, hydro) turbine protection
Engineering Advantages
- Signal Fidelity: Maintains the calibrated gap voltage and sensitivity (V/mm or V/mil) of the full transducer chain — no derating required when used within the specified total cable length budget.
- EMI Immunity: Double-shielded coaxial construction rejects interference from VFDs, high-voltage switchgear, and RF sources common in industrial environments.
- Environmental Durability: PUR jacket resists hydraulic oil, lubricating oil, cleaning solvents, and mechanical abrasion — rated for continuous outdoor and enclosed machinery space installation.
- OEM Dimensional Compliance: Connectors and cable geometry are manufactured to Bently Nevada drawing tolerances, ensuring correct mating with 3300/3500 Series probes and proximitors without modification.
- Plug-and-Play Replacement: No recalibration of the monitoring system is required when replacing a like-for-like extension cable of the same length suffix.
System Architecture & Signal Flow
The 3500 Series proximity transducer system operates as a three-component chain:
- Eddy-Current Probe (tip + integral cable) — senses shaft position via eddy-current effect
- Extension Cable (BA21747-045-01) — transmits the high-frequency oscillator signal between probe and proximitor over the installation distance
- Proximitor / Driver Module — conditions the signal and outputs a calibrated DC voltage proportional to gap distance, fed to the 3500 rack monitor card
The total cable length (probe integral cable + extension cable) must remain within the system’s calibrated range. The BA21747-045-01 (-045 = 4.5 m) is selected when the installation geometry requires this specific extension increment. Mixing cable lengths outside the calibrated combination will shift the system sensitivity and zero-gap voltage — always verify the total chain length against the applicable Bently Nevada system specification sheet.
Sourcing & Quality Verification
- Origin: Sourced from authorized Bently Nevada (Baker Hughes) distribution channels and verified surplus OEM stock.
- Inspection: Each unit undergoes visual inspection of connectors, jacket integrity, and labeling before dispatch.
- Documentation: Certificate of conformance (CoC) and original manufacturer datasheet available upon request.
- Traceability: Lot and date codes retained for quality records; traceable to OEM manufacturing batch where available.
- Packaging: Anti-static bag + foam-lined carton; connectors capped to prevent contamination during transit.
Procurement Process
- Confirm your system’s total cable length budget (probe integral cable + required extension) against the Bently Nevada system specification.
- Verify the -045 (4.5 m) length suffix meets your installation geometry.
- Place order via Konmask.com — stock items ship within 1–3 business days; lead time for non-stock quantities quoted on request.
- Request CoC and datasheet at checkout notes or via [email protected].
- For volume orders (>5 units) or project-based procurement, contact us for a formal quotation with delivery schedule.
Technical FAQ
Q: Can I use the BA21747-045-01 with a 3300 Series proximitor?
A: The 3500 Series extension cables are mechanically and electrically compatible with 3300 Series transducer chains in most configurations, but always verify the total cable length and connector type against your specific 3300 Series system specification before installation.
Q: What is the maximum total cable length for the 3500 Series transducer system?
A: Maximum total cable length (probe + extension) is system-dependent and specified in the Bently Nevada 3500 Series Transducer System Specification (document 141078). Typical limits are 9 m or 15 m depending on the probe model and gap range. Do not exceed the specified total without recalibration.
Q: Is recalibration required after replacing the extension cable?
A: No recalibration is required if the replacement cable is the same part number (same length suffix) as the original. If the length changes, the system must be recalibrated to the new total cable length per Bently Nevada procedures.
Q: Do you supply the matching probe and proximitor?
A: Yes. Konmask.com stocks a broad range of Bently Nevada 3300 and 3500 Series probes, extension cables, and proximitor modules. Contact [email protected] with your full system BOM for a matched-set quotation.
Q: What is the lead time for large quantity orders?
A: Standard stock orders (1–5 units) ship within 1–3 business days. For quantities >5, lead time is typically 5–15 business days depending on availability. Contact us for a formal quotation.
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