Bently Nevada 330103-11-16-10-12 Proximity Probe – 3300 XL Series

Bently Nevada 330103-11-16-10-12: 8mm Eddy Current Proximity Probe in the 3300 XL Transducer System

The 330103-11-16-10-12 is an 8mm eddy current proximity probe manufactured by Bently Nevada as part of the 3300 XL Proximity Transducer System. Within a machinery protection loop, this probe functions as the primary sensing element responsible for converting mechanical displacement — shaft radial vibration, axial position, and differential expansion — into a proportional DC voltage signal. The output feeds directly into Bently Nevada 3300 or 3500 series monitor cards, which execute alarm and trip logic in real time. Without a calibrated, API 670-compliant probe at the measurement point, the entire protection chain loses its physical reference. This SKU specifies a 1.0 m armored probe cable, a 5.0 m extension cable, 3/8-24 UNF thread, and a standard coaxial connector — the most widely deployed field configuration across petrochemical, power generation, and rotating equipment OEM installations.

The operating principle is based on Faraday’s law of electromagnetic induction. The probe tip houses a wound coil driven by a high-frequency oscillator (typically 1.0 MHz carrier) embedded in the paired driver/oscillator-demodulator module. When the conductive shaft surface enters the probe’s electromagnetic field, eddy currents are induced on the shaft surface, loading the coil and reducing its impedance. The driver circuit converts this impedance change into a linear DC voltage output: –2 VDC at minimum gap (0.25 mm / 10 mil) to –22 VDC at maximum gap (2.25 mm / 90 mil), with a scale factor of 7.87 V/mm (200 mV/mil). This voltage is then conditioned, filtered, and compared against alarm setpoints in the monitor card.

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

Technical Parameters

Hardware Logical Analysis

The 330103-11-16-10-12 probe body is machined from 316 stainless steel, selected for its corrosion resistance in hydrogen sulfide (H₂S) and chloride-bearing process atmospheres. The sensing coil is encapsulated in a thermosetting polymer compound with a glass transition temperature exceeding 150°C, preventing coil deformation under sustained thermal cycling in hot-section turbine casings.

The 1.0 m armored probe cable uses a 316 SS braid over a PTFE-insulated coaxial core. PTFE dielectric maintains stable capacitance per unit length across the full operating temperature range, which is critical because any capacitance drift in the coaxial line shifts the effective scale factor at the driver. The armor braid provides mechanical protection against abrasion in confined bearing housings and simultaneously acts as an EMC shield, attenuating radiated interference from adjacent VFD cabling and high-current bus bars — a common noise source in compressor trains where variable-speed drives operate at switching frequencies of 2–16 kHz.

The 3/8-24 UNF thread allows fine-pitch gap adjustment during commissioning. Each full rotation of the probe body advances or retracts the tip by 1.058 mm (41.7 mil), giving the commissioning engineer precise control over the initial gap voltage target — typically set to –10.0 VDC ± 0.5 VDC (gap of approximately 1.27 mm / 50 mil) per API 670 Section 5 commissioning procedure. A locknut secures the probe at the calibrated position, preventing vibration-induced rotation during operation.

The probe’s electromagnetic field penetration depth is approximately 1.5× the probe tip diameter, meaning the 8mm probe interrogates a surface layer roughly 12 mm deep on the shaft. This depth is sufficient to detect surface and near-surface defects such as residual magnetism, chrome plating delamination, or surface hardness variations — all of which alter the eddy current loading and produce a false displacement reading. Bently Nevada’s calibration procedure accounts for this by specifying target material and surface finish requirements: Ra ≤ 1.6 µm and Rockwell hardness within a defined range.

System Integration Benefits

• Deterministic real-time response: The DC–10 kHz frequency response captures all vibration components relevant to rotating machinery — sub-synchronous (instability, rub), synchronous (unbalance, misalignment), and super-synchronous (blade pass, gear mesh) — without aliasing or phase lag introduced by mechanical filters.
• Direct monitor card compatibility: The 330103-11-16-10-12 interfaces natively with Bently Nevada 3300 and 3500 series monitor cards via the 3300 XL driver, eliminating signal conditioning adapters and the associated failure modes they introduce.
• API 670 traceability: Full compliance with API 670 (5th edition) ensures the probe meets the machinery protection standard required by EPC contractors and insurance underwriters for critical rotating equipment in oil & gas, LNG, and power generation facilities.
• Non-contact measurement eliminates wear: With no physical contact between probe and shaft, there is no mechanical wear mechanism. Mean time between replacement (MTBR) is determined by environmental degradation rather than contact fatigue, supporting continuous operation intervals exceeding 5 years in clean environments.
• Diagnostic transparency via gap voltage monitoring: The DC output voltage provides a continuous, real-time indication of probe-to-shaft gap. Trending the gap voltage over time reveals bearing wear (decreasing gap), shaft bow (oscillating gap at 1× running speed), and probe fouling (erratic gap signal) — all without additional instrumentation.
• Plug-compatible replacement: The 330103-11-16-10-12 is dimensionally and electrically identical to previous 3300 XL 8mm probe variants of the same cable configuration. Like-for-like replacement does not require driver recalibration, reducing planned maintenance downtime to the time required for mechanical installation and gap verification.
• EMC-hardened signal path: The armored coaxial cable construction maintains signal integrity in environments with radiated field strengths up to 10 V/m across 80 MHz–1 GHz, consistent with IEC 61000-4-3 Level 3 immunity — relevant in substations and motor control centers co-located with compressor trains.
• Wide thermal operating envelope: The –35°C to +121°C range covers both cryogenic LNG compressor applications (where ambient temperatures can reach –30°C during cold-start) and hot-section steam turbine bearing housings where sustained temperatures approach 110°C.

Quality Assurance & Global Logistics

Every 330103-11-16-10-12 unit supplied through siemensplc.com is sourced as genuine Bently Nevada OEM hardware. Units are inspected upon receipt: serial number and date code are verified against manufacturer records, housing dimensions are checked against the OEM datasheet, and connector integrity is confirmed. Counterfeit-risk items are rejected at intake without exception. A Certificate of Conformance (CoC) is available upon request for each shipment.

Logistics operations are based in Xiamen, China — a major international port city with direct air freight connections to Singapore, Dubai, Frankfurt, Los Angeles, and Tokyo. In-stock units are dispatched within 1–3 business days via DHL Express, FedEx International Priority, or UPS Worldwide Expedited, depending on destination and customer preference. Export documentation — commercial invoice, packing list, and HS code declaration (HS 9031.80) — is prepared in compliance with Chinese customs regulations and destination country import requirements. Typical transit times: Southeast Asia 2–4 days, Europe 3–5 days, North America 4–6 days, Middle East 3–5 days.

All shipments are packed in anti-static ESD-safe packaging with desiccant to prevent moisture ingress during transit. Fragile probe tips are protected with foam inserts. Each package is labeled with the SKU, serial number, and CoC reference for receiving inspection at the customer’s facility.

Contact Information

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