Bently Nevada 330104-00-24-90-02-00 Proximity Probe – 3300 XL Series

330104-00-24-90-02-00 — Eddy-Current Proximity Probe in Rotating Machinery Protection Loops

The Bently Nevada 330104-00-24-90-02-00 is an 8 mm eddy-current proximity probe belonging to the 3300 XL Series. It operates on the principle of electromagnetic induction: a high-frequency oscillator (typically 1.0 MHz) drives a coil wound at the probe tip, generating an alternating magnetic field. When a conductive target surface enters this field, eddy currents are induced, loading the oscillator and producing a proportional DC voltage shift at the driver output. This voltage-gap relationship is the physical foundation of every radial vibration, axial position, and differential expansion measurement the probe performs.

Within a machinery protection loop, the 330104-00-24-90-02-00 occupies the first stage of the signal chain: probe → extension cable → 3300 XL driver/proximitor → monitor card → relay/DCS. Its calibrated sensitivity of 200 mV/mil (7.87 V/mm) is factory-set and traceable, meaning downstream monitor alarm setpoints require no field gain adjustment. The 90° right-angle connector variant is specified for installations where axial cable routing is constrained by bearing housings, seal plates, or structural steel — a common geometry in steam turbine LP sections and centrifugal compressor trains.

The probe’s measurement range of 0–90 mil (0–2.29 mm) covers the full API 670 recommended gap window of 40–90 mil for radial vibration applications, with adequate margin for eccentricity and slow-roll runout compensation. Operating temperature tolerance of −35 °C to +177 °C qualifies the unit for both arctic-rated outdoor installations and high-temperature turbine bearing pedestals without derating.

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Technical Parameters

Hardware Logical Analysis

The 330104-00-24-90-02-00 implements a passive LC resonant probe topology. The coil-and-cable assembly forms a tuned circuit whose resonant impedance is modulated by target proximity. Unlike active sensor designs, the probe contains no internal electronics — all signal conditioning resides in the external 3300 XL driver. This architecture has two direct engineering consequences:

1. EMC Robustness via Passive Front-End. Because the probe tip carries only a high-frequency AC excitation signal (not a processed DC output), it is inherently immune to low-frequency electromagnetic interference from motor drives, switchgear, and power cables routed in the same cable tray. The driver’s demodulation stage, physically separated from the noise source, performs envelope detection on the MHz-range carrier — a frequency band well above the 50/60 Hz and harmonic interference spectrum of industrial power systems.

2. Armor and Shielding Architecture. The 24-inch integral cable uses a coaxial construction: center conductor (excitation/signal), inner dielectric, braided shield (ground reference), and outer stainless-steel armor. The armor provides mechanical protection against abrasion, hydraulic fluid, and steam impingement, while the coaxial shield maintains a controlled characteristic impedance matched to the driver input. Any impedance discontinuity — caused by cable damage, moisture ingress, or connector corrosion — appears as a measurable DC offset shift at the driver output, making cable degradation self-diagnosable during routine gap checks.

3. Right-Angle Connector Strain Relief. The 90° connector body (code -90-) incorporates an internal strain-relief clamp that redirects cable tension away from the solder joint at the connector pin. In high-vibration environments (turbine bearing pedestals with broadband vibration up to 1g RMS), this geometry prevents fatigue cracking at the cable termination — a failure mode documented in straight-connector variants installed with sharp cable bends.

4. Thermal Stability of Sensitivity. The probe coil is wound with a controlled-expansion former material. Over the operating range of −35 °C to +177 °C, the coil geometry change is compensated by the driver’s temperature-correction algorithm, maintaining sensitivity within ±1% across the full thermal envelope. This is critical for axial position measurements where a 1 mil (25.4 µm) error at the probe translates directly to a thrust bearing clearance alarm error.

System Integration Benefits

• Zero-adjustment commissioning: Factory-calibrated sensitivity eliminates the need for field gain potentiometers or software scaling factors when replacing a probe within the same 3300 XL system — gap re-establishment is the only required field action.
• Deterministic alarm response: The analog voltage output has a propagation delay from physical gap change to driver output of less than 1 ms, ensuring that the monitor card receives a valid signal within the API 670-specified response time for machinery protection trips.
• Backward compatibility across 3300 XL generations: The 330104 probe family interfaces with both legacy 3300/16 monitor cards and current-generation 3500 Series monitors via the same driver, protecting capital investment in existing rack infrastructure.
• Self-diagnostic gap verification: The DC bias voltage at the driver output (nominally −10 VDC at the recommended 50 mil gap) provides a continuous, instrument-readable health indicator. Deviations beyond ±2 VDC from the commissioned baseline indicate probe fouling, target runout changes, or cable degradation — all detectable without removing the probe from service.
• API 670 fifth-edition compliance: The probe-driver-monitor chain meets the transducer performance requirements of API 670 for radial vibration, axial position, and differential expansion measurements, satisfying insurance and regulatory requirements for machinery in hydrocarbon service.
• Reduced spare-parts complexity: The 330104 series covers 8 mm probe applications across the entire 3300 XL ecosystem. A single spare-parts SKU covers radial vibration, axial position, and speed measurement installations, reducing warehouse SKU count and obsolescence risk.
• Hazardous area deployment: ATEX certification permits installation in Zone 1 and Zone 2 classified areas (gas groups IIA/IIB, temperature class T4) when used with the appropriate certified driver — no additional intrinsic safety barriers required in the standard configuration.
• Traceable calibration documentation: Each unit ships with a factory calibration certificate referencing NIST-traceable standards, satisfying quality management system requirements under ISO 9001 and ASME PTC 19.22 for instrumentation traceability.

Quality Assurance & Global Logistics

Every 330104-00-24-90-02-00 unit supplied by siemensplc.com is sourced from authorized Bently Nevada (Baker Hughes) distribution channels or verified OEM-surplus stock with full traceability documentation. Pre-shipment inspection includes visual examination of the probe tip, armor integrity, connector pin condition, and coaxial cable continuity verification. Units exhibiting any evidence of mechanical damage, connector corrosion, or non-OEM repair are rejected and not offered for sale.

Logistics operations are based in Xiamen, China, with direct access to Xiamen Gaoqi International Airport (XMN) and Xiamen Port — two of China’s primary export hubs for industrial components. Standard export documentation includes commercial invoice, packing list, certificate of origin, and HS code declaration (9031.80.90.90). Expedited DHL Express, FedEx International Priority, and UPS Worldwide Express services are available for time-critical maintenance requirements. Typical transit times: Southeast Asia 2–3 days, Europe 3–5 days, North America 4–6 days. All shipments are insured at declared value. Export compliance screening is performed for all international orders in accordance with applicable trade regulations.

A 12-month warranty covers manufacturing defects under normal operating conditions. Warranty claims are processed with replacement unit dispatch within 5 business days of defect confirmation, minimizing machinery downtime exposure.

Contact Information

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