Bently Nevada 330101-00-28-10-02-CN Proximity Probe – 3300 XL Series

Bently Nevada 330101-00-28-10-02-CN: 8mm Eddy-Current Proximity Transducer in Continuous Shaft Monitoring Loops

The 330101-00-28-10-02-CN is an 8mm eddy-current proximity probe manufactured by Bently Nevada (a Baker Hughes company) as part of the 3300 XL Proximity Transducer System. It is engineered for non-contact, continuous measurement of radial shaft vibration, axial position, and differential expansion on rotating machinery operating under API 670 machinery protection requirements. The probe ships with a 1.0-metre integral cable terminated in a CN-type connector, which conforms to Chinese industrial wiring standards and mates directly with 3300 XL-compatible extension cables and driver/oscillator modules without adapter hardware.

In a complete 3300 XL transducer chain, the 330101-00-28-10-02-CN occupies the sensing end of a three-component system: probe, extension cable, and driver/oscillator. The driver supplies a −24 VDC bias and a 1 MHz carrier signal through the cable. The probe tip coil generates an alternating magnetic field; when a conductive target (typically AISI 4140 steel) enters the field, eddy currents are induced, loading the oscillator circuit. The driver converts this impedance change into a DC voltage output with a nominal sensitivity of 7.87 V/mm (200 mV/mil), linear across a gap range of 0.25 mm to 2.54 mm (10 to 100 mil). This output feeds directly into Bently Nevada 3500 Series monitor cards or equivalent API 670-compliant monitors for alarm and trip processing.

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

Technical Parameters

Hardware Logical Analysis

The 330101-00-28-10-02-CN probe tip houses a precision-wound coil embedded in a thermoplastic housing rated to 177 °C continuous. The coil geometry is matched at the factory to the 3300 XL driver’s 1 MHz oscillator circuit, ensuring the probe-driver pair operates within a tightly controlled impedance window. This factory-matched calibration eliminates field trimming and guarantees that the sensitivity coefficient of 7.87 V/mm holds across the full operating temperature range without software correction.

EMC and Shielding Architecture: The integral cable uses a double-layer shield — an inner foil layer bonded to the coaxial signal conductor and an outer braided shield connected to the driver chassis ground. This topology suppresses both capacitively coupled high-frequency interference (common in VFD-dense environments) and inductively coupled low-frequency noise from adjacent power cables. The shield termination at the CN connector is a 360° circumferential crimp, not a pigtail, which maintains shield continuity at frequencies up to several hundred MHz and prevents ground loops that would otherwise introduce DC offset errors into the gap voltage output.

Thermal Stability: The probe body material has a low coefficient of thermal expansion matched to the coil former, preventing mechanical stress on the winding at temperature extremes. The driver compensates for residual sensitivity drift using an internal temperature-compensation network, keeping the overall system sensitivity error within ±0.5% across the full −35 °C to +177 °C range. This is critical for axial position measurements where a 0.01 mm drift at operating temperature can represent a meaningful change in thrust bearing clearance.

Target Material Sensitivity: The probe is factory-calibrated against AISI 4140 steel. For non-standard alloys (stainless steel, titanium, Inconel), the effective sensitivity deviates due to differences in electrical conductivity and magnetic permeability. Bently Nevada publishes material correction factors; for shafts machined from 316 stainless, the sensitivity drops to approximately 6.5 V/mm, requiring a recalibration of the monitor’s engineering unit scaling. This probe’s documentation includes a material correction table covering 12 common shaft alloys.

CN Connector Mechanical Design: The CN connector body is a threaded-coupling design with a positive locking ring, providing IP67 ingress protection at the mating interface. The contact arrangement uses gold-plated pins with a contact resistance below 5 mΩ, preventing signal degradation in humid or chemically aggressive environments typical of petrochemical plants.

System Integration Benefits

• Deterministic DC output: The probe delivers a continuous DC voltage proportional to gap distance, with no sampling latency. Monitor cards read this signal at their own scan rate (typically 1 ms for 3500 Series cards), enabling deterministic real-time response to shaft excursions without signal reconstruction delays.
• Zero mechanical contact: Non-contact measurement eliminates wear, lubrication requirements, and the mechanical resonance artifacts introduced by contact-type displacement sensors. The probe has no moving parts and an indefinite mechanical service life under normal operating conditions.
• Plug-and-play with 3500 Series monitors: The 330101-00-28-10-02-CN is a pre-qualified component in the Bently Nevada 3500 system BOM. Monitor cards auto-detect probe type via the driver’s output characteristics, eliminating manual range configuration and reducing commissioning time.
• API 670 compliance: The complete transducer chain (probe + extension cable + driver) meets API 670 Fifth Edition requirements for radial vibration, axial position, and speed measurement channels. This simplifies machinery protection system certification for new installations and replacements in regulated industries.
• Diagnostic transparency via gap voltage: The DC bias voltage at the monitor input provides a continuous, real-time indication of probe-to-shaft gap. Operators can trend gap voltage over time to detect shaft centerline migration, bearing wear, or probe mounting looseness — all without interrupting production.
• Wide frequency bandwidth: The DC-to-10 kHz frequency response captures both low-frequency rotor dynamics (1× and 2× running speed on machines up to 600,000 RPM theoretical) and higher-frequency structural resonances, making the probe suitable for both slow-speed machinery and high-speed turbomachinery without hardware changes.
• Interchangeable within the 3300 XL ecosystem: All 330101-series probes share identical electrical characteristics. A failed probe can be replaced with any 330101 variant of the same cable length without recalibrating the monitor, provided the driver and extension cable remain unchanged. This reduces mean time to repair (MTTR) in critical machinery protection applications.
• Hazardous area suitability: ATEX certification allows deployment in Zone 1 and Zone 2 classified areas (gas groups IIA/IIB, temperature class T4) when used with an approved Zener barrier or galvanic isolator. This covers the majority of upstream oil and gas and chemical processing installations.

Quality Assurance & Global Logistics

Every 330101-00-28-10-02-CN unit supplied by siemensplc.com is sourced through verified channels with full traceability documentation. Units are inspected upon receipt: gap voltage output is verified at the nominal 1.27 mm gap against a calibrated reference target, and cable continuity and shield integrity are confirmed with a time-domain reflectometer (TDR) test. Only units passing 100% electrical verification are entered into inventory.

Packaging preserves the original Bently Nevada anti-static bag and cardboard insert. The probe tip is protected by a machined plastic cap during transit. For international shipments, units are double-boxed with 50 mm foam cushioning on all six faces, meeting ISTA 2A drop and vibration test requirements. Export documentation includes a commercial invoice, packing list, and certificate of origin. HS code 9031.80 applies for most destination countries; buyers requiring specific customs documentation (e.g., Form E for ASEAN preferential tariff) should advise at the time of order.

Shipments originate from our warehouse in Xiamen, China. Standard international express (DHL / FedEx / UPS) delivers to most destinations within 3–5 business days. For urgent plant shutdowns, same-day dispatch is available for orders confirmed before 14:00 CST. Sea freight consolidation is available for bulk orders exceeding 50 units. All shipments are fully insured at declared value. A 12-month warranty covers manufacturing defects; field-damaged units are assessed on a case-by-case basis with repair or exchange options.

Contact Information

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