Bently Nevada 330104-00-18-05-01-CN Proximity Transducer – 3300 XL

Bently Nevada 330104-00-18-05-01-CN: Eddy-Current Proximity Transducer for Critical Rotating Machinery Protection

The Bently Nevada 330104-00-18-05-01-CN is an 8 mm eddy-current proximity transducer belonging to the 3300 XL Proximity Transducer System. It is engineered for continuous, non-contact measurement of shaft radial vibration, axial position, and differential expansion in turbines, compressors, pumps, and motors operating under API 670 machinery protection requirements. The -CN suffix designates China-specific certification markings; all electrical and mechanical parameters are identical to the standard international variant.

Within a control loop, this transducer functions as the primary sensing element that converts mechanical displacement into a proportional DC voltage signal. The output feeds directly into a Bently Nevada Proximitor driver (330180 or 330190 series), which conditions the signal before transmission to a 3500 or 3300 series monitoring rack. The rack executes alarm and trip logic in real time, making the accuracy and linearity of this transducer directly consequential to machinery protection integrity. Any drift in scale factor or gap voltage baseline propagates immediately into the protection system’s decision boundary — underscoring why factory-matched, calibrated assemblies are specified in critical installations.

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Technical Parameters

Hardware Logical Analysis

The 330104-00-18-05-01-CN operates on the principle of electromagnetic induction: a high-frequency oscillator within the paired Proximitor driver (typically 1.0 MHz carrier) drives an alternating magnetic field through the probe coil. When a conductive target enters the field, eddy currents are induced on the target surface, loading the oscillator circuit and reducing its amplitude. The Proximitor demodulates this amplitude change into a DC output voltage proportional to the gap distance between probe tip and target surface.

EMC Design: The probe cable is a coaxial assembly with a continuous shield bonded at the Proximitor end only (single-point grounding), which suppresses common-mode noise injection from adjacent power cables and variable-frequency drives — a frequent interference source in compressor trains. The shield termination scheme maintains signal integrity at the 200 mV/mil scale factor even in environments with radiated field strengths up to 10 V/m per IEC 61000-4-3.

Thermal Stability: The probe coil former is wound on a ceramic mandrel with a low coefficient of thermal expansion (~3 ppm/°C), minimizing scale factor drift across the −35°C to +121°C operating envelope. In steam turbine applications where probe tip temperatures can approach 100°C during transient load changes, this thermal stability prevents false displacement readings that would otherwise trigger nuisance alarms.

Gap Voltage Baseline: At the nominal installation gap of 1.0 mm (40 mil), the output sits at approximately −10.5 VDC. This mid-range bias point maximizes the usable linear range symmetrically — ±1.0 mm — allowing the monitoring system to detect both inward and outward shaft excursions without clipping the output signal. The Proximitor’s internal temperature compensation circuit corrects for driver gain variation up to ±0.5% over the full temperature range, maintaining measurement accuracy without field recalibration.

Matched-Set Architecture: The 3300 XL system is calibrated as a three-component matched set: probe (330104), extension cable (330130/330140), and Proximitor driver (330180/330190). Substituting any single component from a different calibration batch introduces a scale factor error that is not correctable through monitoring rack configuration alone. This architecture is the primary reason API 670 installations specify matched-set replacement rather than individual component substitution.

System Integration Benefits

• Direct 3500/3300 rack compatibility: The −2 to −18 VDC output range maps natively to Bently Nevada 3500 series I/O module input specifications, requiring no signal conditioning adapters or range scaling at the rack level.
• Deterministic alarm response: Because the transducer output is a continuous DC voltage with a 10 kHz bandwidth, the monitoring rack can execute alarm and trip decisions within one scan cycle (~1 ms for 3500 series), meeting API 670 response time requirements without buffering or averaging delays.
• Dual-use measurement: A single probe installation simultaneously provides radial vibration (AC component, filtered above ~1 Hz) and average shaft centerline position (DC component), eliminating the need for separate displacement sensors in most bearing housings.
• Diagnostic transparency: The gap voltage baseline (nominally −10.5 VDC at 1.0 mm) is directly readable at the Proximitor output terminal, enabling field technicians to verify probe installation gap without removing the probe or using external instrumentation.
• Intrinsically safe option availability: The ATEX-certified variant of this probe series supports installation in Zone 1 hazardous areas (gas group IIC, temperature class T4) when paired with an approved Zener barrier, covering the majority of offshore and refinery compressor applications.
• Long cable runs: The coaxial cable assembly maintains signal integrity over the full 5 m probe-to-driver distance without impedance matching networks, and the 330130/330140 extension cable system extends this to 15 m total without degrading the frequency response specification.
• System 1 software integration: Output signals from this transducer feed directly into Bently Nevada System 1 condition monitoring software via the 3500 rack’s Ethernet gateway, enabling trend analysis, orbit plots, and Bode diagrams without additional signal processing hardware.
• Cross-platform DCS compatibility: The standard −24 VDC supply and DC voltage output are compatible with third-party DCS analog input cards (Emerson DeltaV, Honeywell Experion, ABB 800xA) operating in the −20 to −20 VDC input range, supporting hybrid monitoring architectures where the Bently Nevada rack is not present.

Quality Assurance & Global Logistics

Every 330104-00-18-05-01-CN unit supplied through siemensplc.com is sourced from verified supply chains with full OEM traceability. Each unit undergoes incoming inspection covering probe coil resistance, cable continuity, connector integrity, and physical condition before dispatch. A Certificate of Conformance is available upon request for installations requiring documentation under ISO 9001 or API 670 audit trails.

Shipments originate from our warehouse in Xiamen, China, with access to major international freight lanes via Xiamen Gaoqi International Airport and Xiamen Port. Standard export documentation — commercial invoice, packing list, and HS code declaration (HS 9031.80) — is prepared for all international orders. For orders requiring ATEX or FM documentation packages, these are coordinated at the time of order confirmation.

Typical dispatch lead time for in-stock units is 1–3 business days. Express air freight to Europe, North America, Southeast Asia, and the Middle East typically achieves door-to-door delivery within 5–10 business days. Sea freight consolidation is available for bulk orders. All units are packed in anti-static foam inserts within double-wall cartons to prevent mechanical damage during transit. The 12-month warranty covers manufacturing defects and is supported by our technical team, who can assist with installation verification and gap-setting procedures remotely.

Contact Information

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