Bently Nevada 330193-09-20-10-00 Proximity Transducer – 3300 XL 8mm

Bently Nevada 330193-09-20-10-00 — Eddy-Current Proximity Transducer for Rotating Machinery Protection

The 330193-09-20-10-00 is a 9 mm eddy-current proximity transducer manufactured by Bently Nevada (Baker Hughes) for use within the 3300 XL 8mm Proximity Transducer System. Its primary function in a control loop is continuous, non-contact measurement of shaft radial vibration, axial position, and differential thermal expansion on critical rotating machinery. The transducer converts the gap distance between its probe tip and a conductive target surface into a proportional DC voltage signal, which is then processed by a paired Proximitor sensor and fed into a 3300 XL series monitor for alarm and trip logic execution.

In machinery protection architectures governed by API 670, the proximity transducer is the first element in the measurement chain. Signal integrity at this stage determines the accuracy of every downstream decision — from vibration alarm thresholds to emergency shutdown actuation. The 330193-09-20-10-00 is configured with a 200 mm armored cable and a 1000 mm extension cable, metric thread, making it suited for installations where probe-to-driver cable routing must traverse confined machine casings or bearing housings with limited access geometry.

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Technical Parameters

Hardware Logical Analysis

The 330193-09-20-10-00 operates on the principle of electromagnetic induction. The probe tip contains a wound coil driven by a high-frequency oscillator (typically 1.0 MHz) housed within the paired Proximitor sensor. When the probe tip is positioned near a conductive target, eddy currents are induced on the target surface. These eddy currents create a secondary magnetic field that opposes the probe’s primary field, loading the oscillator circuit and reducing its amplitude. The Proximitor demodulates this amplitude change into a DC output voltage linearly proportional to the gap distance.

The 200 mm armored cable between probe and connector is a mechanically critical element. It is constructed with a coaxial geometry — center conductor, dielectric, shield braid, and stainless steel armor jacket — to maintain consistent characteristic impedance across the cable length. Any impedance discontinuity introduced by mechanical damage, moisture ingress, or improper termination will shift the oscillator loading curve and introduce a static measurement offset. The armor jacket provides protection against abrasion from rotating components and vibration-induced fatigue at the probe exit point, which is the highest mechanical stress location in the assembly.

The metric thread on the probe body allows precise gap setting during installation. The standard installation gap for 3300 XL 8mm systems is 1.0 mm (40 mil), placing the operating point at the center of the linear range. This gap is set using a non-magnetic feeler gauge with the machine stationary, then verified against the Proximitor output voltage (nominally -10.4 VDC at 1.0 mm gap). Deviation from this nominal at installation indicates either a probe calibration issue or a target surface condition problem (runout, surface finish, material composition mismatch).

EMC performance of the 330193 series is achieved through the coaxial cable construction and the Proximitor’s differential input architecture. The shield braid is grounded at the Proximitor end only (single-point grounding) to prevent ground loop currents from appearing as common-mode noise on the signal. In environments with high electromagnetic interference — variable frequency drives, large motor starters, arc furnaces — the armored cable provides an additional Faraday shield layer, attenuating capacitively coupled interference before it reaches the center conductor.

System Integration Benefits

• Deterministic signal latency: The eddy-current measurement chain from probe to Proximitor output introduces less than 100 µs of signal delay, ensuring that high-frequency vibration events (sub-synchronous instability, blade passing frequencies) are captured without phase distortion at the monitor input.
• Direct API 670 compliance path: The 330193-09-20-10-00 is designed to meet the transducer requirements of API 670 5th Edition, reducing the engineering burden of compliance documentation for new machinery protection system installations.
• Plug-compatible with 3300 XL monitor ecosystem: The transducer, extension cable, and Proximitor form a calibrated system. No field calibration of sensitivity is required when using matched Bently Nevada components — the system sensitivity is factory-set to 7.87 V/mm.
• Dual-use measurement capability: A single installed transducer can simultaneously provide radial vibration data (AC component) and average shaft centerline position data (DC component) to the monitor, reducing the number of penetrations required in the machine casing.
• Diagnostic transparency via gap voltage monitoring: The Proximitor output voltage provides a continuous, real-time indication of probe gap. Slow drift in the DC gap voltage over time is a reliable indicator of bearing wear, thermal growth, or shaft bow — enabling predictive maintenance decisions before vibration alarm levels are reached.
• High-temperature probe body compatibility: The probe is rated to +177°C at the tip, allowing installation adjacent to bearing housings on steam turbines and gas turbines where ambient temperatures routinely exceed 120°C.
• Metric thread standardization: Eliminates the need for thread adapters in metric-standard machinery housings common in European and Asian OEM equipment, reducing installation error risk and hardware count.
• Long-term measurement stability: The solid-state construction with no moving parts and no consumable elements results in a sensor with no wear-out failure mode under normal operating conditions. MTBF data published by Bently Nevada for the 3300 XL transducer family exceeds 200,000 hours in typical industrial environments.

Quality Assurance & Global Logistics

Every 330193-09-20-10-00 unit supplied by siemensplc.com is sourced through verified supply channels and subjected to a structured pre-shipment inspection protocol. Part number markings, date codes, and label formats are cross-referenced against Bently Nevada/Baker Hughes documentation to screen for non-genuine components. Probe tip geometry, cable jacket integrity, connector pin condition, and thread form are inspected visually and dimensionally. Where available, original factory test documentation and certificates of conformance are included with the shipment package.

Logistics operations are managed from Xiamen, China — a major export hub with direct access to international express carriers (DHL, FedEx, UPS) and sea freight consolidators. Standard export documentation (commercial invoice, packing list, certificate of origin) is prepared for each shipment. For time-critical requirements, air express delivery to major industrial centers in Southeast Asia, the Middle East, Europe, and the Americas is typically achievable within 3–7 business days from order confirmation. All units are packed in anti-static, shock-absorbing packaging with rigid outer cartons to protect the probe tip and cable assembly during transit. A 12-month warranty against defects in materials and workmanship is provided from the date of shipment.

Contact Information

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