Bently Nevada 330194-00-18-10-00 Proximity Probe – 3300 XL ETR Series

Bently Nevada 330194-00-18-10-00 — Eddy-Current Proximity Probe for High-Temperature Rotating Machinery Monitoring

The Bently Nevada 330194-00-18-10-00 is an 18-inch Extended Temperature Range (ETR) eddy-current proximity probe belonging to the 3300 XL Series — a platform engineered specifically for continuous, non-contact shaft vibration and radial position measurement in critical rotating machinery. Within a condition monitoring loop, this probe functions as the primary transducer: it converts mechanical displacement of a conductive target (typically a shaft journal) into a proportional DC voltage signal, which is then processed by a matched Proximitor sensor and routed to a 3500 Series rack monitor for alarm arbitration and machinery protection logic.

The probe operates on the eddy-current induction principle. A high-frequency oscillator within the Proximitor drives an alternating magnetic field through the probe tip coil. When a conductive target enters the field, eddy currents are induced on the target surface, loading the oscillator circuit and attenuating the field amplitude. The Proximitor converts this impedance change into a calibrated DC output: nominally –24 VDC at the center of the linear range, with a sensitivity of 200 mV/mil (7.87 V/mm). The linear measurement range spans 80 to 180 mil (2.03 to 4.57 mm) gap, providing 20 mil of usable margin on each side of the nominal 130 mil installation gap.

The ETR designation is the defining characteristic of the 330194 sub-series. Standard 3300 XL probes are rated to +121°C at the probe tip; the ETR variant extends this to +177°C, achieved through a reformulated coil encapsulant with a higher glass-transition temperature and a high-temperature fluoropolymer cable jacket rated for continuous service at the same threshold. This makes the 330194-00-18-10-00 the correct selection for steam turbine bearing pedestals, hot-section compressor casings, and any installation where ambient soak temperature at the probe body exceeds 100°C.

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Technical Parameters

Hardware Logical Analysis

The 330194-00-18-10-00 probe body is a hermetically sealed, potted assembly. The coil winding is encapsulated in a ceramic-loaded epoxy compound selected for its low coefficient of thermal expansion (CTE) and resistance to thermal cycling fatigue — a critical design parameter in steam turbine applications where probe tip temperatures can cycle between ambient and 160°C+ during start-stop sequences. The CTE mismatch between the coil former, encapsulant, and stainless housing is managed through a controlled-geometry winding mandrel and a staged cure profile, preventing micro-crack formation that would shift the probe’s calibration curve over time.

The integral cable is a coaxial construction with a solid center conductor, PTFE primary dielectric, and a braided shield terminated at both the probe body and the MIL-spec connector. The shield continuity is critical: any shield discontinuity introduces common-mode noise directly into the signal path, manifesting as elevated broadband noise floor on the spectrum analyzer — a failure mode that is frequently misdiagnosed as bearing roughness. The fluoropolymer jacket provides a dielectric strength exceeding 1,500 V/mil, ensuring insulation integrity even in environments with oil mist, steam condensate, or cleaning solvents.

EMC performance is governed by the coaxial cable geometry and the Proximitor’s differential input architecture. The probe-cable-Proximitor system achieves a common-mode rejection ratio (CMRR) sufficient to suppress 50/60 Hz power-frequency interference to below the noise floor at rated sensitivity — a requirement explicitly addressed in API 670 Section 5.3. The 3/8-24 UNF thread and the locknut interface provide a rigid, vibration-resistant mechanical mount; the thread engagement depth should be verified against the probe holder drawing to ensure the probe tip sits within the calibrated linear range at the nominal installation gap of 130 mil.

System Integration Benefits

• Direct 3300 XL ecosystem compatibility: The 330194-00-18-10-00 is factory-calibrated as a matched set with the 330180 Series 8 mm Proximitor. No field calibration of sensitivity is required when the correct Proximitor is used; the system gap voltage at installation is the only field-verified parameter.
• Deterministic alarm response: When integrated with the Bently Nevada 3500/40M Proximitor/Seismic Monitor, the probe signal is sampled at a fixed rate with hardware-enforced latency below 20 ms from transducer to relay output — a deterministic response characteristic that software-based monitoring cannot replicate.
• Dual-measurement capability: A single probe installation simultaneously provides radial vibration (AC component, 1×–10 kHz) and average shaft centerline position (DC component), eliminating the need for a separate position transducer in most bearing configurations.
• Diagnostic transparency via gap voltage trending: The DC gap voltage trend is a direct indicator of bearing wear progression. A shift of more than ±2 VDC from the baseline gap voltage, absent any known process change, is a quantifiable early warning of journal wear or bearing pad erosion — actionable data that a seismic velocity sensor cannot provide.
• Reduced installation variability: The 18-inch probe body length accommodates deep bearing pedestal installations where shorter probes would require extension cables, introducing an additional connector interface and potential impedance discontinuity. Eliminating the extension cable reduces the total system uncertainty budget.
• High-temperature margin for turbine applications: The 177°C ETR rating provides a 56°C margin above the standard probe rating, allowing the probe to remain within specification during abnormal operating conditions such as loss of bearing cooling water — a scenario where standard probes would drift out of calibration before the protection system could respond.
• Long-term calibration stability: The ceramic-loaded encapsulant and controlled-geometry coil winding maintain sensitivity within ±1% of the factory calibration value over a 5-year service interval under normal operating conditions, reducing the frequency of scheduled calibration outages.
• API 670 compliance for insurance and regulatory purposes: Machinery protection systems on critical rotating equipment in petrochemical and power generation facilities are typically required by insurance underwriters and local regulations to comply with API 670. The 330194-00-18-10-00 is designed and documented to meet this standard, simplifying the compliance documentation package for new installations and replacements.

Quality Assurance & Global Logistics

Every Bently Nevada 330194-00-18-10-00 unit supplied through siemensplc.com is sourced from verified distribution channels and undergoes a documented pre-shipment inspection covering physical integrity of the probe housing and cable jacket, connector contact condition, and completeness of accompanying documentation including the factory calibration record and certificate of conformance. Units are not modified, remanufactured, or relabeled. The 12-month warranty against manufacturing defects is honored directly through our technical support team, with no requirement to route claims through a third-party intermediary.

Logistics operations are managed from Xiamen, China — a major port city with direct access to DHL Express, FedEx International Priority, and UPS Worldwide Expedited services. Standard express transit times are 3–5 business days to North America and Western Europe, 2–4 business days to Southeast Asia, and 4–7 business days to the Middle East and South America. For project-based bulk procurement, consolidated sea freight via Xiamen Port is available with full export documentation including commercial invoice, packing list, and certificate of origin. All shipments are packed in anti-static, shock-absorbing packaging appropriate for precision instrumentation, with individual unit serial numbers recorded against the shipping manifest for traceability.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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