Bently Nevada 330101-00-20-20-02-CN Proximity Probe – 3300 XL 8mm

Bently Nevada 330101-00-20-20-02-CN — 8mm Eddy-Current Proximity Probe in the 3300 XL Transducer System

The 330101-00-20-20-02-CN is an 8mm eddy-current proximity probe manufactured by Bently Nevada as a primary sensing element within the 3300 XL Non-contact Transducer System. Its function in a control loop is unambiguous: it converts the physical gap between probe tip and rotating target into a proportional DC voltage signal, providing the continuous position and vibration data that protection and condition-monitoring systems require to make real-time trip and alarm decisions. Without a calibrated, low-noise signal at this first stage, every downstream calculation — orbit plots, Bode diagrams, shaft centerline trends — carries compounded measurement error. The 330101-00-20-20-02-CN eliminates that risk through a tightly controlled electromagnetic geometry and a factory-matched cable assembly.

The part number suffix encodes the full mechanical configuration: probe tip extension of 200 mil (5.08 mm), integral cable length of 200 inches (5.0 m), standard 2-pin MIL-C-5015 connector, and CN designation indicating a non-ATEX standard approval configuration. This specific combination is the most widely deployed variant in general-purpose petrochemical and power-generation installations where cable routing distances between probe and driver fall within the 5 m integral cable specification.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The 330101-00-20-20-02-CN operates on a resonant eddy-current circuit. The probe tip houses a precision-wound coil driven by a high-frequency oscillator located in the paired 330180-series driver module. When the coil is energized, it projects an alternating electromagnetic field perpendicular to the probe face. As a conductive target enters this field, eddy currents are induced on the target surface, loading the oscillator circuit and reducing its amplitude. The driver’s demodulator stage converts this amplitude change into a DC voltage output with a linear scale factor of 7.87 V/mm — a relationship that holds within ±0.25% across the 2.0 mm linear range when the target is AISI 4140 steel.

EMC Design: The integral armored cable is a critical EMC element, not merely a mechanical convenience. The factory-terminated, shielded construction maintains a controlled characteristic impedance between probe coil and driver oscillator, preventing standing-wave reflections that would introduce gain error at higher vibration frequencies. The 316L stainless steel probe body provides a continuous Faraday shield around the coil assembly, attenuating capacitively coupled interference from adjacent high-voltage cabling common in turbomachinery enclosures. This shielding architecture allows the probe to maintain its DC–10 kHz bandwidth specification in environments with strong variable-frequency drive (VFD) switching noise.

Thermal Stability: The coil winding uses a temperature-compensated formulation that holds scale factor drift to within the published ±0.25% tolerance across the full –40 °C to +177 °C operating envelope. This is achieved through matched thermal expansion coefficients between the coil former, potting compound, and probe body — a design constraint that makes the 330101 series unsuitable for field repair but ensures measurement traceability over the probe’s service life without periodic recalibration.

Target Material Dependency: The eddy-current field penetration depth is a function of target electrical conductivity and magnetic permeability. The factory calibration for AISI 4140 steel establishes the 7.87 V/mm scale factor. Targets with different alloy compositions — Inconel 718, titanium 6Al-4V, or duplex stainless — alter both penetration depth and induced current density, shifting the effective scale factor. For non-standard target materials, a material correction factor must be applied at the driver or monitoring rack level, or a field recalibration performed against a known gap standard.

Integral vs. Extension Cable Architecture: The 200-inch (5.0 m) integral cable in this variant eliminates one connector junction compared to a short-body probe paired with an extension cable. Each connector junction introduces a potential impedance discontinuity and a mechanical failure point in high-vibration environments. For installations where the probe-to-driver distance is ≤5 m, the 330101-00-20-20-02-CN is the lower-risk configuration. For longer distances, the 330130-series extension cable must be added, and the total system cable length must remain within the driver’s calibrated specification to preserve scale factor accuracy.

System Integration Benefits

• Zero-wear measurement path: Non-contact sensing eliminates probe-to-shaft contact forces entirely. There is no mechanical loading on the rotor, no wear debris generation, and no periodic replacement interval driven by contact fatigue — the probe’s service life is determined by environmental exposure, not mechanical wear.
• DC-coupled bandwidth for static position: The DC–10 kHz frequency response includes DC, meaning the probe simultaneously measures static shaft position (thrust position, shaft centerline) and dynamic vibration without signal conditioning gaps. A single probe replaces what would otherwise require separate position and vibration transducers in older architectures.
• Direct rack compatibility: The 330101-00-20-20-02-CN is a drop-in replacement within any existing 3300 XL monitoring architecture. The 330180-series driver requires no reconfiguration; the monitoring rack’s I/O module sees an identical signal chain. This eliminates the re-commissioning overhead associated with cross-series probe substitutions.
• Deterministic signal latency: The analog output from the driver stage has no digital processing latency. The gap-to-voltage conversion is continuous and instantaneous within the oscillator’s settling time, ensuring that the monitoring rack receives a real-time signal with no sample-and-hold delay — a requirement for machinery protection systems with trip response times in the 1–20 ms range.
• Orbit plot fidelity: When two 330101-series probes are mounted at 90° on the same bearing journal, the matched scale factors (both 7.87 V/mm) produce geometrically accurate shaft orbit plots without correction coefficients. Asymmetric scale factors between X and Y probes introduce elliptical distortion in circular orbits, masking rub and instability signatures.
• Diagnostic transparency via gap voltage: The raw DC gap voltage is accessible at the driver’s output terminals, allowing field technicians to verify probe-to-shaft gap without removing the probe from its mounting bracket. A voltmeter reading of –10.0 VDC at the driver output corresponds to a 1.27 mm (50 mil) gap — the nominal installation target — providing a direct, instrument-independent installation verification method.
• Compatibility with System 1 software: The 3300 XL transducer system is fully supported by Bently Nevada System 1 condition monitoring software. Probe configuration data (scale factor, gap range, serial number) can be entered directly into System 1’s asset database, enabling automated alarm setpoint calculation and trend deviation alerts without manual engineering unit conversion.
• Hazardous area deployment flexibility: While the CN suffix designates a standard (non-ATEX) configuration, the 330101 series is available in ATEX-certified variants for Zone 1 and Zone 2 classified areas. Procurement teams specifying for mixed-classification plants can standardize on the 330101 probe family across all bearing locations, selecting the appropriate approval suffix per zone without changing the monitoring rack configuration.

Quality Assurance & Global Logistics

Every 330101-00-20-20-02-CN unit dispatched from our Xiamen, China facility is sourced through verified industrial distribution channels with full supply-chain traceability to Bently Nevada’s authorized manufacturing and distribution network. Pre-shipment inspection covers physical integrity of the probe body and tip, connector pin condition and seating torque, cable armor continuity, and label authenticity — including manufacturer date codes and serialization. Original OEM packaging, labeling, and documentation are preserved without remarking or repackaging. A Certificate of Conformance (CoC) is available upon request for regulated industries including nuclear, offshore, and pharmaceutical applications.

Logistics from Xiamen operate via DHL Express, FedEx International Priority, and UPS Worldwide Expedited, with typical transit times of 3–5 business days to major industrial hubs in Southeast Asia, the Middle East, and Europe. Export documentation — commercial invoice, packing list, and HS code 9031.80 classification — is prepared in-house and included with every shipment. For time-critical plant shutdowns, same-day dispatch is available for in-stock units when orders are confirmed before 14:00 CST. Volume orders and blanket purchase agreements are accommodated with scheduled release shipments to minimize buyer inventory carrying costs.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
© 2026 siemensplc.com. All rights reserved.