Bently Nevada 16710-35 Interconnect Cable – 3300 XL Series

Bently Nevada 16710-35 — 35 ft Coaxial Interconnect Cable for 3300 XL Proximity Transducer Systems

The Bently Nevada 16710-35 is a 35-foot (10.7 m) factory-standard coaxial interconnect cable engineered specifically for the 3300 XL proximity transducer system. Within a rotating machinery protection loop, this cable occupies the signal path between the proximitor output and the monitoring rack input — a segment where impedance discontinuity, ground-loop noise, or connector degradation directly translates into measurement error at the monitor. Its role is not passive: the cable’s characteristic impedance, shielding architecture, and connector metallurgy are all matched to the 3300 XL system’s DC-coupled, eddy-current signal chain to preserve the sub-millivolt resolution required for API 670-compliant shaft displacement and vibration measurement.

The “-35” suffix in the part number denotes the cable length in feet. Bently Nevada manufactures this cable family in discrete length variants (25 ft, 35 ft, 50 ft) to accommodate the physical distance between the proximitor housing — typically mounted at the machine bearing housing — and the junction box or marshalling panel feeding the 3500 or System 1 monitor rack. Selecting the correct length is not merely a convenience consideration: excess cable coiled in a conduit introduces distributed capacitance that shifts the proximitor’s operating point on its voltage-gap curve, potentially causing calibration offset. The 16710-35 is dimensioned for installations where the proximitor-to-panel run falls in the 9–11 m range after accounting for routing bends and conduit entry allowances.

Electrically, the cable is a low-noise, DC-coupled coaxial assembly. The center conductor carries the proximitor output signal — a negative DC voltage nominally in the −2 VDC to −18 VDC range, modulated by the gap between the probe tip and the target shaft. The outer shield serves as both the signal return and the EMC barrier. Bently Nevada specifies the shield as a 95%+ coverage braid, which provides adequate attenuation of radiated interference from variable-frequency drives, high-current bus bars, and motor starters commonly co-located in turbomachinery control rooms. The cable jacket is rated for continuous operation from −40 °C to +125 °C, covering the thermal envelope of most outdoor and near-bearing installations without requiring supplemental thermal protection.

Connector terminations at both ends are MIL-spec coaxial fittings, factory-crimped and tested for contact resistance and pull-out force. Field-assembled connectors on aftermarket cables are a documented source of intermittent faults in proximity systems: micro-arcing at a poorly crimped center pin introduces high-frequency noise that the 3500 monitor’s input filter cannot fully reject, producing spurious vibration alarms. The 16710-35’s factory terminations eliminate this failure mode and are dimensionally compatible with the TNC-style receptacles on 3300 XL proximitors and the panel-mount bulkhead connectors used in standard Bently Nevada junction boxes.

In turbomachinery protection applications — steam turbines, gas turbines, centrifugal compressors, and large pumps — the interconnect cable is a component that is rarely replaced on a scheduled basis but whose degradation is a known contributor to nuisance trips and missed alarms. Jacket cracking from thermal cycling, shield braid corrosion in humid or H₂S-bearing atmospheres, and connector oxidation from condensation ingress are the primary failure mechanisms. Maintaining a stocked spare of the 16710-35 is standard practice in facilities operating under API 670 or equivalent machinery protection standards, where unplanned downtime costs are measured in tens of thousands of dollars per hour.

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Technical Parameters

Hardware Logical Analysis

The 16710-35 functions within an eddy-current proximity measurement chain whose signal integrity depends on three hardware-level properties: characteristic impedance matching, shield transfer impedance, and connector contact stability.

Impedance Matching: The 3300 XL proximitor presents a defined output impedance to the cable. Any deviation in the cable’s characteristic impedance — caused by non-standard dielectric material, inconsistent conductor geometry, or field-modified connectors — creates a reflection coefficient at the cable-to-proximitor interface. In a DC-coupled system, this does not produce standing waves in the RF sense, but it does alter the effective load seen by the proximitor’s output stage, shifting the voltage-gap transfer function by a measurable offset. The 16710-35 is manufactured to the impedance specification defined in Bently Nevada’s system drawings, ensuring the proximitor operates within its characterized linearity range.

EMC Shield Architecture: The ≥95% braid coverage provides a shield transfer impedance low enough to attenuate common-mode interference from 50/60 Hz power conductors and switching-frequency harmonics from VFDs (typically 2–20 kHz) to levels below the 3500 monitor’s input noise floor. The shield is grounded at one end only — at the junction box — to prevent ground-loop currents from flowing through the shield braid and appearing as a differential-mode noise voltage on the center conductor. This single-point grounding topology is specified in Bently Nevada installation drawings and must be preserved when replacing the cable.

Connector Contact Stability: The factory-crimped MIL-spec connectors maintain a contact resistance below 5 mΩ across the operating temperature range. Thermal cycling between −40 °C and +125 °C produces differential expansion between the connector body (typically brass or stainless) and the cable dielectric. Factory crimping applies a controlled deformation that accommodates this expansion without loosening the center-pin contact. Field-assembled connectors using hand tools cannot replicate this controlled deformation, which is why Bently Nevada specifies factory-terminated cables for API 670 installations.

Thermal and Chemical Resistance: The jacket compound is selected for resistance to the hydrocarbon vapors, lubricating oils, and cleaning solvents present in turbomachinery environments. At sustained temperatures above 100 °C — common near bearing housings on high-speed compressors — PVC jackets can plasticize and lose dimensional stability. Bently Nevada’s cable specification addresses this through jacket compound selection and wall thickness, maintaining mechanical protection of the braid and dielectric across the rated temperature range.

System Integration Benefits

• Preserves Calibration Traceability: Using the OEM-specified 16710-35 ensures the proximitor’s voltage-gap calibration curve — established at the factory using this cable’s exact capacitance and impedance — remains valid in the field. Substituting a cable with different distributed capacitance shifts the operating point and invalidates the factory calibration without triggering any monitor alarm.
• Deterministic Signal Latency: The cable’s propagation delay is fixed and negligible at the DC-to-10 kHz bandwidth of proximity vibration signals. This ensures that phase measurements between multiple probes on the same shaft — used for orbit plot construction and balancing — are not corrupted by differential cable delays.
• Maintains API 670 Compliance: API 670 (5th edition) requires that all components in the measurement chain be qualified and documented. The 16710-35 carries Bently Nevada’s part number and revision traceability, satisfying the documentation requirements for safety-instrumented machinery protection systems.
• Reduces Nuisance Trip Risk: Connector oxidation and shield discontinuity are leading causes of intermittent high-vibration alarms in proximity systems. The factory-terminated, OEM-sourced 16710-35 eliminates the connector quality variable, reducing the probability of spurious trips that force unplanned shutdowns.
• Compatible with 3500 Monitor Rack Diagnostics: The 3500 system performs continuous OK/Not-OK status monitoring of the proximitor output voltage. A cable with incorrect impedance or a degraded shield can cause the proximitor output to drift outside the OK window, triggering a channel not-OK condition. The 16710-35’s matched electrical characteristics keep the proximitor output within the OK band under all specified operating conditions.
• Supports System 1 Condition Monitoring Integration: When the 3500 rack feeds data to Bently Nevada System 1 software, signal quality at the cable level directly affects the accuracy of waveform analysis, spectrum computation, and alarm setpoint validation. A low-noise, impedance-matched cable is a prerequisite for reliable spectral data at frequencies above 1× running speed.
• Plug-and-Replace Field Serviceability: The 16710-35 requires no field modification, re-termination, or calibration adjustment upon installation. Replacement is a direct swap: disconnect at the proximitor and junction box, route the new cable through the existing conduit, reconnect, and verify proximitor OK status. Mean time to replace is under 30 minutes for a trained technician.
• Stocking Efficiency for MRO Programs: The discrete length variants (25 ft, 35 ft, 50 ft) allow maintenance planners to stock a single part number per installation rather than maintaining bulk cable and connector inventory. The 16710-35 covers the majority of standard turbomachinery installations where the proximitor-to-panel distance falls in the 8–12 m range.

Quality Assurance & Global Logistics

Every Bently Nevada 16710-35 unit supplied by siemensplc.com is sourced from verified OEM channels or authenticated surplus stock. Prior to dispatch, each cable undergoes a three-point inspection: visual examination of connector bodies and jacket integrity, continuity verification of center conductor and shield braid, and dimensional check of connector engagement length. Units that do not pass all three checks are quarantined and not offered for sale. Certificate of Conformance (COC) documentation is available upon request for units destined for API 670 or SIL-rated installations.

Logistics operations are based in Xiamen, China — a major port city with direct access to DHL Express, FedEx International Priority, and UPS Worldwide Expedited services. Standard export packaging uses anti-static foam inserts within a rigid outer carton, protecting connector terminations from mechanical shock during air freight handling. For urgent requirements, same-day dispatch is available for orders confirmed before 14:00 CST. Transit times to major industrial hubs: Europe 3–5 business days, North America 4–6 business days, Southeast Asia 2–3 business days, Middle East 4–7 business days. Sea freight consolidation is available for volume MRO orders where lead time permits. All shipments include commercial invoice, packing list, and HS code documentation for customs clearance. Import duty and VAT obligations are the responsibility of the consignee; siemensplc.com can provide DAP or DDP terms for qualified accounts upon request.

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