Bently Nevada 330104-10-16-10-02-00 Proximity Probe – 3300 XL 8mm

330104-10-16-10-02-00 Eddy-Current Proximity Probe: Non-Contact Shaft Measurement in the 3300 XL 8mm Proximitor System

The Bently Nevada 330104-10-16-10-02-00 is a factory-calibrated eddy-current proximity probe designed for continuous, non-contact measurement of shaft radial vibration, axial position, and differential expansion in critical rotating machinery. It belongs to the 3300 XL 8mm Proximitor® System — a measurement chain that has been the de facto standard in turbomachinery protection for over three decades. This specific configuration carries a 5 mm probe tip diameter housed in an 8 mm body, a calibrated linear measurement range of 10–16 mm, and a 2-metre (suffix -02) factory-terminated integral coaxial cable. The probe operates exclusively with the 3300 XL Proximitor® signal conditioner, which supplies the –24 VDC oscillator drive and converts the raw impedance change at the probe tip into a DC voltage output of 200 mV/mil (7.87 V/mm) nominal sensitivity.

In a machinery protection architecture, the proximity probe occupies the most upstream position in the signal chain: it is the transducer that converts a physical gap change — measured in micrometres — into an electrical signal that feeds the monitor, the trip relay, and ultimately the emergency shutdown system. Any degradation in probe linearity, sensitivity drift, or cable impedance mismatch propagates directly into false alarms or, more critically, missed trip conditions. The 330104-10-16-10-02-00 addresses this by maintaining a sensitivity tolerance of ±1% across its full linear range, ensuring that the monitor’s alarm and danger setpoints remain valid without field recalibration after a like-for-like replacement.

The part number decodes as follows: 330104 = probe model family (8mm eddy-current); 10 = 5mm tip diameter code; 16 = linear range upper bound (16 mm); 10 = standard temperature rating; 02 = 2-metre integral cable; 00 = standard configuration. Each suffix position is a functional parameter, not a cosmetic variant — substituting an incorrect suffix changes the calibration curve and renders the Proximitor output inaccurate.

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

Technical Parameters

Hardware Logical Analysis

The operating principle of the 330104-10-16-10-02-00 is based on the Lenz’s law interaction between a high-frequency oscillating magnetic field — generated by the probe’s internal coil driven at approximately 1.0 MHz by the Proximitor oscillator — and the eddy currents induced in the conductive target surface. As the gap between the probe tip and the shaft surface changes, the eddy-current loading on the coil changes proportionally, altering the coil’s effective impedance. The Proximitor demodulates this impedance change and outputs a calibrated DC voltage. The entire transduction chain is passive at the probe end: there are no active components, no local power conditioning, and no signal processing circuitry inside the probe body itself. This architecture is deliberate — it eliminates failure modes associated with semiconductor junction degradation in high-temperature bearing housings.

The 8 mm body diameter and 5 mm tip geometry define the probe’s sensitivity field depth and lateral resolution. A smaller tip concentrates the electromagnetic field into a tighter focal zone, which improves spatial resolution for detecting surface defects or runout components but reduces the usable linear range compared to larger-tip variants. The 10–16 mm linear range of this configuration is optimised for standard journal bearing clearance monitoring, where the nominal installed gap is typically set at 12–13 mm (approximately 50 mil) to centre the probe in its linear region.

EMC performance is achieved through the coaxial cable geometry: the integral 2-metre cable maintains a controlled characteristic impedance from the probe coil to the Proximitor input, preventing standing-wave reflections that would introduce measurement noise at the oscillator frequency. The factory-terminated design eliminates the field-spliced connector joints that are a common source of impedance discontinuity and moisture ingress in retrofit installations. The cable jacket material is rated to 121 °C, which accommodates routing through bearing housing covers and turbine pedestals without thermal degradation of the dielectric.

The –35 °C to +177 °C probe body rating covers the full range of industrial rotating machinery environments: from outdoor compressor stations in arctic climates to steam turbine bearing housings operating at elevated casing temperatures. The ceramic-filled epoxy potting compound used in the probe tip assembly maintains dimensional stability and dielectric properties across this temperature range, preventing sensitivity drift caused by thermal expansion of the coil former.

System Integration Benefits

• Drop-in replacement without Proximitor recalibration: The 330104-10-16-10-02-00 maintains the same sensitivity curve as all 3300 XL 8mm probes, allowing direct substitution in an existing installation without adjusting the Proximitor’s output scaling or the monitor’s engineering unit conversion — a critical requirement for unplanned maintenance windows where recalibration time is unavailable.
• Deterministic signal latency: The passive probe architecture introduces zero processing delay between gap change and coil impedance change. Combined with the Proximitor’s analog demodulation, the end-to-end signal latency from shaft movement to monitor input is governed only by the Proximitor’s filter bandwidth — typically 10 kHz flat response — ensuring that high-frequency vibration events (blade passing, sub-synchronous instability) are captured without phase distortion.
• Dual-measurement capability: A single probe installation can simultaneously provide radial vibration (AC component) and average shaft centerline position (DC component) to the monitor, reducing the number of penetrations required in the bearing housing and simplifying the mechanical installation.
• Compatibility with 3500 rack diagnostics: When connected to a Bently Nevada 3500/40M or 3500/42M monitor, the probe’s output feeds the rack’s built-in transducer health check function, which continuously monitors the probe gap voltage against configured OK limits and generates a transducer not OK (TNK) alert if the gap drifts outside the linear range — providing real-time installation health monitoring without manual inspection.
• Scalable cable length via 330130 extension: The 2-metre integral cable can be extended to 5 m, 9 m, or 15 m total system length using the 330130 series extension cable, without changing the Proximitor calibration, provided the total length matches the Proximitor’s configured range. This allows the probe to be installed in deep bearing housings or remote locations while keeping the Proximitor in an accessible junction box.
• Multi-parameter measurement in a single channel: The 3500 monitor can extract 1× amplitude, 1× phase, 2× amplitude, sub-synchronous components, and DC gap from a single probe channel simultaneously, reducing the hardware count required for a full vibration analysis suite.
• ATEX-rated for hazardous area deployment: The probe’s ATEX certification permits installation in Zone 1 and Zone 2 classified areas (gas turbine enclosures, compressor buildings) without requiring additional intrinsic safety barriers at the probe end, simplifying the installation design and reducing cable routing complexity.
• Long-term calibration stability: The absence of active components in the probe body means there is no drift mechanism associated with component aging or thermal cycling of semiconductor junctions. Sensitivity remains within the ±1% tolerance for the service life of the probe, provided the target surface condition and material are maintained within specification.

Quality Assurance & Global Logistics

Every 330104-10-16-10-02-00 unit dispatched from our Xiamen facility undergoes a structured incoming inspection protocol before it enters available stock. Part number, date code, and label formatting are cross-referenced against Bently Nevada OEM documentation. The integral cable connector is inspected for centre-pin alignment, dielectric integrity, and jacket continuity. Probe body markings are verified against the part number decode matrix to confirm that the tip diameter, linear range, cable length, and configuration suffixes are consistent with the ordered specification.

Units are packed in anti-static foam-lined cartons with the probe tip protected by a machined plastic cap and the cable coiled to a minimum bend radius of 50 mm to prevent coaxial dielectric deformation during transit. Each shipment includes a packing list, a certificate of conformance, and — on request — a copy of the original manufacturer’s calibration documentation.

From Xiamen, China, we dispatch via DHL Express, FedEx International Priority, and UPS Worldwide Expedited. Standard transit times are 3–5 business days to Europe and North America, 2–4 business days to Southeast Asia and the Middle East, and 1–2 business days to Hong Kong, Taiwan, and South Korea. For critical plant shutdowns requiring same-day or next-flight-out dispatch, contact our sales team directly via WhatsApp for real-time stock confirmation and emergency freight coordination. All shipments are fully insured and tracked from dispatch to delivery confirmation.

A 12-month warranty from the dispatch date covers manufacturing defects and sensitivity out-of-tolerance conditions verified by return inspection. Warranty claims are processed within 5 business days of receipt of the returned unit.

Contact Information

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