Bently Nevada 330104-12-19-10-02-00 Proximity Transducer System – 3300 XL Series

Bently Nevada 330104-12-19-10-02-00: Eddy-Current Proximity Transducer System for Critical Rotating Machinery

The 330104-12-19-10-02-00 is a factory-matched, three-component proximity transducer system within Bently Nevada’s 3300 XL platform. It consists of a 5 mm eddy-current probe, a 12-inch (305 mm) extension cable, and a 19-foot (5.79 m) armored interconnect cable terminated to the Proximitor® sensor. The system is calibrated as an integrated unit at the factory, which eliminates the sensitivity drift that occurs when field-assembled components from different production lots are combined. In rotating machinery protection, this matters: a 1% sensitivity error at 200 mV/mil translates directly into a 2 mV/mil offset that can shift alarm setpoints by several mils — enough to mask early-stage bearing wear on a high-speed compressor shaft.

The -02-00 suffix in the part number encodes the armor and termination configuration. The “02” designates a stainless-steel-braided armor jacket over the interconnect cable, providing mechanical protection against abrasion, rodent damage, and incidental contact in congested machinery basements. The “00” termination code indicates a standard flying-lead configuration compatible with the full range of 3300 XL Proximitor® sensors. This configuration is the most widely deployed variant in the 330104 family and is the default replacement specification cited in most OEM machinery documentation for turbines, compressors, and pumps built to API 670.

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Technical Parameters

Hardware Logical Analysis

The 3300 XL probe operates on the eddy-current (electromagnetic induction) principle. The probe tip contains a coil driven by a high-frequency oscillator circuit housed in the Proximitor® sensor, typically at 1.0 MHz carrier frequency. When the probe tip approaches a conductive target — the rotating shaft — eddy currents are induced in the target surface. These currents load the oscillator, reducing its amplitude in proportion to the gap distance. The Proximitor® demodulates this amplitude-modulated signal and outputs a DC voltage proportional to the gap: at 80 mil (2.03 mm) gap, the output is approximately −16 VDC; at 0 mil, it approaches 0 VDC. The linear region between 10 mil and 90 mil is the calibrated operating window.

EMC Design: The interconnect cable carries a low-level analog signal (millivolt-range AC riding on a DC bias) over distances up to 19 feet through environments with significant electromagnetic interference from motor drives, switchgear, and RF sources. The stainless-steel braid armor serves a dual function: mechanical protection and a Faraday shield. The shield is grounded at the Proximitor® end only (single-point grounding), which prevents ground-loop currents from injecting common-mode noise into the signal path. This topology is consistent with IEC 61000-4-6 conducted immunity requirements and is why the 3300 XL system maintains signal integrity in environments with conducted disturbances up to 10 V RMS.

Factory Calibration Matching: The probe, extension cable, and interconnect cable each contribute a defined impedance to the oscillator tank circuit. Bently Nevada calibrates the complete system as a matched set, assigning a system sensitivity that accounts for the combined cable capacitance and resistance. Substituting any single component from a different production lot without recalibration introduces a systematic sensitivity error. The factory-matched 330104-12-19-10-02-00 eliminates this risk — the sensitivity is guaranteed at 200 mV/mil ±1% across the linear range when used with a compatible 3300 XL Proximitor® sensor.

Probe Tip Geometry: The 5 mm probe diameter defines the effective sensing area and, consequently, the minimum shaft diameter for accurate measurement. For a 5 mm probe, the minimum recommended shaft diameter is approximately 25 mm (1 inch). The probe tip is recessed within a stainless-steel housing to protect the coil from direct contact and to maintain a defined standoff geometry. The M8 × 1.0 thread allows precise gap adjustment during installation, with each full rotation changing the gap by 1.0 mm — a deterministic mechanical relationship that simplifies field setup.

System Integration Benefits

• Direct rack compatibility: The 330104-12-19-10-02-00 interfaces directly with the Bently Nevada 3500 Series Machinery Protection System rack modules (3500/40M, 3500/42M, 3500/45, 3500/46M) without signal conditioning adapters, preserving the full 4–20 mA and relay output chain to the DCS or safety system.
• Deterministic frequency response: The DC-to-10,000 Hz flat response covers all relevant vibration frequencies for rotating machinery from 600 RPM (10 Hz fundamental) through 10× running speed harmonics at 10,000 RPM — no anti-aliasing filter correction required in the monitoring rack for standard machinery.
• Non-contact measurement eliminates wear: Unlike contact-type displacement sensors, the eddy-current probe has no moving parts and does not contact the shaft. Mean time between failures is governed by cable integrity and connector corrosion, not mechanical wear — a critical advantage in continuous-duty applications where sensor replacement requires a planned outage.
• Dual-use measurement capability: A single 330104 channel can simultaneously provide radial vibration (AC component, 1–10,000 Hz bandpass) and shaft centerline position (DC component) to the monitoring rack. This eliminates the need for separate displacement and vibration sensors on the same bearing journal, reducing penetration count in the bearing housing.
• Diagnostic transparency via gap voltage: The DC output voltage at any operating condition directly indicates the physical probe-to-shaft gap. Operators can read the gap in real time from the Proximitor® output without removing the probe — a direct diagnostic indicator of shaft thermal growth, bearing wear, or probe mounting drift over time.
• Armored cable routing flexibility: The 19-foot interconnect cable with stainless-steel braid armor allows routing through cable trays shared with power cables, across hot surfaces up to 85 °C, and through areas with mechanical abrasion risk — without requiring conduit or additional mechanical protection in most installations.
• API 670 compliance path: When installed per Bently Nevada installation drawings and the API 670 standard, the 330104-12-19-10-02-00 satisfies the transducer system requirements for radial vibration and axial position monitoring on critical and essential machinery as defined in API 670 Section 5.
• System 1® software integration: The analog output from the Proximitor® sensor is fully compatible with Bently Nevada System 1® condition monitoring software via the 3500 rack’s communication modules, enabling trend logging, alarm management, and waveform capture at the enterprise level without signal conversion.

Quality Assurance & Global Logistics

Every 330104-12-19-10-02-00 unit dispatched from our Xiamen facility undergoes a structured incoming inspection protocol before it enters available inventory. Probe tip geometry and coil continuity are verified. Extension cable and interconnect cable connector seating is checked for proper engagement and locking. The system sensitivity is spot-checked against a reference target at a defined gap using a calibrated Proximitor® sensor. Units that do not meet the 200 mV/mil ±2% acceptance criterion are quarantined and not offered for sale.

Packaging follows anti-static and shock-protection requirements: the probe tip is protected with a machined plastic cap, cables are coiled to manufacturer-specified minimum bend radius, and the complete assembly is sealed in a moisture-barrier bag with desiccant before boxing. Export documentation — commercial invoice, packing list, and certificate of origin — is prepared to comply with customs requirements in the destination country. Shipments to Europe, the Middle East, Southeast Asia, and the Americas are dispatched via DHL Express or FedEx International Priority, with typical transit times of 3–7 business days from Xiamen. For urgent plant shutdown requirements, same-day dispatch is available for in-stock units when orders are confirmed before 14:00 CST.

All units carry a 12-month warranty against manufacturing defects from the date of shipment. Warranty claims are processed with a replacement-first policy: a replacement unit is dispatched upon receipt of the defective unit and confirmation of the fault condition.

Contact Information

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