Bently Nevada 330130-045-03-00 Proximity Extension Cable – 3300 XL Series

Bently Nevada 330130-045-03-00 — Signal Transmission Architecture in the 3300 XL Proximity Transducer Loop

The Bently Nevada 330130-045-03-00 is a 4.5-metre (45-inch) coaxial extension cable manufactured to OEM specification for the 3300 XL Proximity Transducer System. Within the eddy-current measurement loop, this cable occupies the critical segment between the proximity probe tip assembly and the proximitor/driver module. Its electrical characteristics — capacitance per unit length, characteristic impedance, and dielectric stability — are factory-matched to the probe and proximitor to maintain the system’s nominal sensitivity of 7.87 V/mm (200 mV/mil) across the full operating temperature range. Any deviation in cable capacitance shifts the linear measurement range and introduces a systematic offset that cannot be corrected by field calibration alone.

The 4.5 m length is the most widely deployed extension length in the 3300 XL product family. It accommodates the physical separation between bearing housings — where probes are installed at close proximity to the shaft — and the proximitor mounting location on the pedestal exterior or junction box, where ambient temperature and accessibility requirements are more favourable. The cable routes through conduit or cable tray and terminates at both ends with system-matched coaxial connectors that maintain impedance continuity at the junction points.

In a standard radial vibration channel, the 330130-045-03-00 carries a high-frequency oscillator signal (typically 1.0 MHz centre frequency) from the proximitor to the probe, and returns the amplitude-modulated gap-voltage signal back to the proximitor for demodulation. The DC output voltage — nominally −10 VDC ± 0.5 V at the calibrated gap — is then transmitted to the 3500 Series monitor rack for alarm and trip processing. Signal integrity across this cable directly determines the accuracy of shaft displacement readings used for machinery protection decisions.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

Impedance Continuity and Capacitance Matching
The 3300 XL eddy-current loop operates as a distributed-parameter RF circuit. The proximitor’s internal oscillator drives the probe coil through the extension cable at approximately 1.0 MHz. At this frequency, the cable’s distributed capacitance forms part of the resonant tank circuit that determines probe sensitivity. Bently Nevada specifies the extension cable capacitance to a tight tolerance so that the combined probe-cable-proximitor assembly meets the published sensitivity specification without field trimming. A generic 50 Ω coaxial cable with a different dielectric constant will present a different capacitance per metre, shifting the resonant frequency and compressing or expanding the linear measurement range — an error that appears as a span shift rather than a zero offset and is therefore difficult to detect during routine calibration checks.

Double-Shield EMC Architecture
The cable employs a two-layer shielding structure: an inner braided copper shield bonded to the coaxial outer conductor, and an outer foil shield connected to the cable armour or conduit ground at the proximitor end. This arrangement provides greater than 85 dB of transfer impedance attenuation across the 100 kHz–10 MHz band, which covers the oscillator frequency and its harmonics. In plant environments where variable-frequency drives (VFDs), high-current bus bars, and switchgear generate broadband conducted and radiated interference, this shielding margin prevents common-mode noise from coupling into the gap-voltage signal and producing spurious vibration readings.

Connector Interface Integrity
The screw-lock coaxial connectors at each end maintain a controlled impedance transition between the cable and the probe body / proximitor input. The connector geometry is dimensionally matched to the 3300 XL mating interfaces, ensuring that the contact resistance remains below 5 mΩ over the service life of the assembly. Connector corrosion or mechanical damage is the most common failure mode in field installations; the OEM connector metallurgy (gold-plated centre pin, nickel-plated shell) resists the sulphur compounds and moisture present in turbine bearing environments.

Thermal Stability of Dielectric
The cable dielectric is selected for low temperature coefficient of permittivity (Δε/ΔT). Over the −40 °C to +85 °C operating range, the capacitance variation is held within the system calibration tolerance, ensuring that the sensitivity of the measurement loop does not drift with ambient temperature changes at the cable routing location. This is particularly relevant in outdoor installations or in turbine enclosures where cable temperatures can vary by 60 °C or more between cold start and full-load operation.

System Integration Benefits

• Preserved Factory Calibration — The matched cable maintains the 7.87 V/mm sensitivity established during factory calibration of the probe-cable-proximitor set, eliminating the need for field sensitivity verification after cable replacement.
• API 670 Compliance Support — The 3300 XL system with OEM extension cables is widely accepted as meeting the signal-path requirements of API 670 (5th Edition) for radial vibration, axial position, and speed monitoring on critical rotating equipment.
• Deterministic Gap Voltage Output — The controlled capacitance ensures the proximitor’s demodulator operates within its designed linear range, producing a gap voltage output with less than ±1% full-scale non-linearity across the measurement span.
• Reduced Diagnostic Ambiguity — When a channel enters Not OK (NOK) status, the known-good electrical characteristics of the OEM cable allow maintenance engineers to isolate the fault to probe, cable, or proximitor with a simple resistance and continuity check, rather than suspecting cable parameter drift.
• SIL Loop Integrity — In Safety Instrumented System (SIS) applications per IEC 61511, the matched cable assembly contributes to the documented proof-test coverage of the measurement loop, supporting SIL 2 loop integrity calculations.
• ATEX / IECEx System Compatibility — The cable is passive and does not carry stored energy; when used with an ATEX-certified proximitor, the complete assembly can be assessed as an intrinsically safe entity for Zone 1 / Zone 2 hazardous area installations.
• Drop-In Field Replacement — Identical mechanical and electrical specification to the original OEM cable means no recalibration, no system re-ranging, and no monitor configuration changes are required when replacing a like-for-like cable in an existing installation.
• Compatibility Across 3300 XL Probe Diameters — A single extension cable part number serves 8 mm, 11 mm, and 14 mm probe systems within the 3300 XL family, simplifying spare-parts inventory management for plants operating multiple probe sizes.
• Long Routing Flexibility — The 4.5 m length covers the majority of turbine pedestal and compressor skid layouts, allowing the proximitor to be positioned in a thermally and mechanically accessible location without requiring custom cable lengths.
• Reduced Total Cost of Ownership — Avoiding sensitivity drift caused by non-OEM cables reduces the frequency of false alarms and unnecessary machinery shutdowns, which in power generation and process industries carry direct production-loss costs measured in thousands of dollars per hour.

Quality Assurance & Global Logistics

Every Bently Nevada 330130-045-03-00 unit supplied by siemensplc.com is sourced through verified industrial distribution channels with full part-number traceability. Pre-shipment inspection covers jacket integrity, connector condition, centre-pin alignment, and coaxial continuity. Units that do not pass inspection are quarantined and not dispatched. Counterfeit or grey-market components are not accepted in our supply chain; we supply only genuine OEM parts.

Logistics operations are based in Xiamen, China, a major international freight hub with direct air cargo connections to Singapore, Dubai, Frankfurt, Los Angeles, and Tokyo. Standard orders ship within 1–3 business days. For plant turnaround and emergency shutdown situations, same-day dispatch is available for orders confirmed before 14:00 CST, with express air freight options delivering to most destinations within 3–5 business days. All shipments include commercial invoice, packing list, and — on request — a certificate of conformance and traceability documentation. Export compliance is handled in accordance with applicable Chinese export regulations and international trade requirements.

A 12-month warranty covers manufacturing defects under normal operating conditions. Warranty claims are processed with a target response time of 1 business day.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
© 2026 siemensplc.com. All rights reserved.