Bently Nevada 330101-00-12-10-01-CN Proximity Probe – 3300 XL Series

Bently Nevada 330101-00-12-10-01-CN — 8mm Non-Contacting Eddy Current Proximity Probe for Turbomachinery Protection

The 330101-00-12-10-01-CN is an 8mm diameter, integral-cable eddy current proximity probe belonging to the Bently Nevada 3300 XL measurement platform. It functions as the primary sensing transducer in a three-component measurement chain — probe, extension cable, and driver/oscillator-demodulator — used to monitor radial shaft vibration, axial thrust position, and differential expansion on rotating machinery. The -CN suffix designates the CN-type coaxial connector variant, optimised for Chinese market junction box infrastructure while maintaining full electrical and mechanical equivalence to the standard international variant.

This probe is specified by OEM turbine builders, EPC contractors, and end-user reliability engineers across petrochemical, power generation, LNG, and heavy industrial sectors where API 670 (5th Edition) compliance is a contractual requirement. Its non-contacting measurement principle eliminates mechanical wear at the sensing interface, enabling continuous 24/7 operation across multi-year maintenance intervals without degradation of scale factor accuracy.

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

Technical Parameters

Hardware Logical Analysis

The 330101-00-12-10-01-CN operates on the principle of electromagnetic induction. The driver oscillator generates a high-frequency carrier signal — typically in the range of 500 kHz to 2 MHz depending on driver configuration — which is transmitted through the coaxial cable to the probe tip coil. This coil radiates a focused electromagnetic field perpendicular to the probe face. When a conductive target (the rotating shaft) enters this field, eddy currents are induced on the target surface. These eddy currents create a counter-magnetic field that loads the probe coil, altering its effective impedance. The driver’s demodulator circuit converts this impedance variation into a proportional DC voltage output, yielding a linear relationship between gap distance and output voltage across the 0.25–2.25 mm measurement range.

EMC Design Architecture: The integral armoured cable is a factory-terminated, double-shielded coaxial assembly. The outer armour provides mechanical protection against abrasion and crush loads in bearing housing installations, while the inner shield is bonded to the driver chassis ground at a single point to suppress common-mode noise injection. This single-point grounding topology prevents ground loop currents — a primary source of low-frequency noise in eddy current systems installed near variable-frequency drives or large transformer banks. The result is a noise floor below 25 mV peak-to-peak under typical industrial EMI conditions, preserving measurement resolution at sub-micron displacement levels.

Thermal Stability: The probe tip coil is wound on a ceramic bobbin with a low thermal coefficient of inductance. This construction limits scale factor drift to within ±1% across the full –35 °C to +177 °C operating range, without requiring field recalibration during seasonal temperature swings. The cable jacket compound is rated to +121 °C continuous, with short-term excursions to +150 °C tolerated without insulation breakdown — a relevant margin for steam-end bearing housing installations where radiated heat from turbine casings is significant.

Connector Integrity: The CN-type connector is a precision-machined coaxial termination with gold-plated centre pin and PTFE dielectric. The PTFE dielectric maintains characteristic impedance continuity at the probe-to-cable junction, preventing reflections that would introduce standing-wave errors in the high-frequency carrier signal. The connector body is sealed to IP67, preventing moisture ingress in wash-down or condensation-prone environments.

System Integration Benefits

• API 670 Drop-In Compliance: The 330101-00-12-10-01-CN meets all dimensional, electrical, and performance requirements of API 670 (5th Edition) for radial vibration and axial position transducers. No additional certification or site acceptance testing is required when replacing an existing 3300 XL probe of the same part number family.
• Deterministic DC-to-10 kHz Bandwidth: The flat frequency response from DC to 10,000 Hz captures the full spectrum of machinery vibration phenomena — from slow-roll eccentricity at 0.1 Hz through fundamental running speed, harmonics, blade-pass frequencies, and high-frequency structural resonances — within a single transducer, eliminating the need for supplementary AC-coupled sensors in most turbomachinery applications.
• Zero-Wear Sensing Interface: The non-contacting measurement principle means the probe tip never contacts the shaft. There is no friction, no fretting, and no wear particle generation at the measurement point. Mean time between replacement is governed by cable fatigue and connector corrosion rather than sensing element wear, typically exceeding 10 years in static installations.
• Direct DCS and Safety System Integration: The –1 to –21 VDC output is directly compatible with Bently Nevada 3500 rack I/O modules, as well as third-party DCS analogue input cards configured for –24 VDC-powered eddy current transducers. No signal conditioning or impedance matching is required at the DCS interface, reducing wiring complexity and potential signal degradation points.
• Diagnostic Transparency via Gap Voltage: The DC component of the output voltage provides a continuous, real-time indication of the probe-to-shaft gap. Operators and condition monitoring systems can monitor gap voltage trends to detect shaft centreline migration, bearing wear, and thermal growth — providing a diagnostic channel that is independent of the AC vibration signal and requires no additional instrumentation.
• Interchangeability Without Recalibration: All 330101-series probes targeting AISI 4140 steel are factory-calibrated to the same 7.87 V/mm scale factor within ±0.5% tolerance. Replacement probes can be installed and returned to service without field calibration, provided the gap is reset to the specified installation gap (typically 1.0–1.5 mm for 8mm probes) using the output voltage as a reference.
• Compatibility with Redundant Protection Architectures: The probe is fully compatible with 2oo3 (two-out-of-three) voting logic architectures used in SIL 2 and SIL 3 machinery protection systems. Three probes can be installed at 120° intervals around the shaft to provide redundant vibration measurement with automatic fault detection and bypass capability, without any modification to the probe hardware.
• Reduced Commissioning Time: The integral cable eliminates the field-assembly step required with separate probe-and-cable systems. The factory-terminated assembly arrives with verified impedance and insulation resistance, reducing pre-commissioning checks to gap setting and output voltage verification — a process that takes under 15 minutes per channel with a calibrated voltmeter.

Quality Assurance & Global Logistics

Each 330101-00-12-10-01-CN unit supplied by siemensplc.com is sourced through verified distribution channels and undergoes a structured pre-shipment inspection protocol before dispatch from our Xiamen, China facility.

Inspection Protocol: Every unit is subject to output voltage linearity verification across the 0.25–2.25 mm measurement range using a calibrated gap-setting fixture. Insulation resistance between the cable shield and centre conductor is measured at 500 VDC; values below 100 MΩ result in rejection. Connector pin geometry and plating condition are inspected under magnification. Original manufacturer packaging, label typography, and serialisation are verified against known-good reference samples as a counterfeit mitigation measure.

Documentation: A Certificate of Conformance (CoC) is available upon request for each shipment. Material traceability records are retained for a minimum of five years. For projects requiring third-party inspection (SGS, BV, Intertek), coordination can be arranged at the quotation stage.

Warranty: All units carry a 12-month warranty from the date of shipment against manufacturing defects and functional failure under normal operating conditions. Warranty claims are processed within 5 business days of receipt of the returned unit.

Logistics from Xiamen, China: Xiamen is a major international port city with direct air freight connections to major hubs in Europe, the Middle East, Southeast Asia, and the Americas. Standard export shipments are dispatched within 3–5 business days of order confirmation for in-stock items. Express air freight (DHL, FedEx, UPS) delivers to most destinations within 3–7 business days. Sea freight consolidation is available for bulk orders. All shipments include a commercial invoice, packing list, and CoC; export customs clearance is handled by our licensed freight forwarder. A tracking number is provided within 24 hours of dispatch.

For time-critical plant shutdowns or emergency replacements, contact us directly via WhatsApp for same-day quotation and expedited dispatch coordination.

Contact Information

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