Bently Nevada 330104-11-17-10-01-00 Proximity Transducer – 3300 XL

Bently Nevada 330104-11-17-10-01-00: 8mm Eddy-Current Proximity Transducer for Continuous Rotating Machinery Protection

The Bently Nevada 330104-11-17-10-01-00 is a non-contact, eddy-current proximity transducer engineered as the sensing element within the 3300 XL Proximity Transducer System. Its primary function in a machinery protection control loop is to convert mechanical shaft displacement into a proportional DC voltage signal — a signal that feeds directly into vibration monitors, safety PLCs, and distributed control systems governing turbine trip logic, compressor surge protection, and pump bearing diagnostics.

Unlike optical or capacitive sensing technologies, the eddy-current principle employed here is immune to oil film contamination, condensation, and non-conductive debris — conditions that are endemic to the bearing housings of steam turbines, centrifugal compressors, and boiler feed pumps. The transducer operates without physical contact with the rotating shaft, eliminating mechanical wear as a failure mode and enabling continuous, uninterrupted measurement across the full operational lifecycle of the machine.

In a typical API 670-compliant protection architecture, this probe is paired with a 330130-series extension cable and a 330180-series driver/oscillator. The driver generates a high-frequency oscillating magnetic field (typically 1.0 MHz) through the probe coil. When a conductive target — such as a 4140 steel journal — enters the field, eddy currents are induced on the target surface, loading the oscillator circuit and producing a measurable impedance shift. The driver converts this impedance change into a DC output voltage 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 voltage output is then conditioned and compared against alarm and danger setpoints within the 3300/16 or 3500/40M Proximitor Monitor. The deterministic, low-latency nature of the signal chain — from shaft displacement to monitor output — is what makes this transducer architecture the standard of record for API 670 machinery protection worldwide.

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Technical Parameters

Hardware Logical Analysis

The 330104-11-17-10-01-00 probe coil is wound on a ferrite core and encapsulated in a thermoplastic housing rated to 177 °C. The coil geometry is precision-matched to the 330180 driver’s oscillator tank circuit, ensuring that the combined system Q-factor remains within the calibrated sensitivity band across the full temperature range. This factory-matched pairing eliminates the field calibration step that is mandatory when using third-party probes with non-matched drivers.

EMC Design: The integral coaxial cable uses a double-shielded construction — an inner braid shield referenced to the driver’s signal ground, and an outer foil shield connected to chassis ground at the driver end only. This single-point grounding topology prevents ground loop currents from modulating the measurement signal, a critical consideration in motor control centers and switchgear rooms where common-mode noise on the order of 10–50 V is routine. The result is a signal-to-noise ratio that remains stable even when the cable runs parallel to 480 VAC power conductors for distances up to 30 m.

Thermal Stability: The probe’s sensitivity coefficient is specified at ±0.5% over the full −35 °C to +177 °C range when used with the matched 330180 driver. This is achieved through a temperature-compensating resistor network embedded in the driver oscillator circuit, which corrects for the coil’s positive temperature coefficient of resistance. Without this compensation, a 100 °C ambient shift would introduce a gap measurement error of approximately 0.05 mm — sufficient to cause nuisance trips in tight-clearance compressor applications.

Mechanical Robustness: The probe tip is machined from PEEK (polyether ether ketone) with a stainless steel nose piece, providing chemical resistance to hydrocarbon process fluids, H₂S, and steam condensate. The cable jacket is rated for continuous immersion in lubricating oil at temperatures up to 150 °C. The integral connector uses a threaded coupling mechanism with a torque specification of 0.9 N·m, preventing vibration-induced loosening in high-cycle fatigue environments.

System Integration Benefits

• Direct API 670 compliance: The 330104 probe, when used within the complete 3300 XL system, satisfies API 670 5th Edition requirements for radial vibration, axial position, and eccentricity measurement without additional field validation — reducing commissioning time by eliminating the sensitivity verification step.
• Zero-reconfiguration replacement: The probe is a direct drop-in for any existing 3300 XL installation. The monitor’s scale factor, alarm setpoints, and trip logic require no modification, preserving the integrity of the safety instrumented function (SIF) without a management-of-change (MOC) cycle.
• Deterministic signal latency: The eddy-current signal chain from shaft displacement to monitor output introduces less than 1 ms of measurement latency. This is essential for turbine overspeed protection loops where the control system must initiate a trip within 20 ms of a dangerous condition being detected.
• Diagnostic transparency: The DC output voltage is directly readable with a standard multimeter at the driver’s BNC output, enabling field technicians to verify gap distance and probe health without removing the machine from service or connecting a dedicated analyzer.
• Wide temperature operating envelope: The −35 °C to +177 °C probe rating covers both arctic outdoor installations (gas compression stations) and high-temperature bearing housings on steam turbines operating at inlet temperatures above 500 °C, where the bearing pedestal temperature can reach 150 °C.
• Oil-immune measurement: The eddy-current principle is unaffected by the dielectric properties of the lubricating oil film between the probe tip and the shaft journal. This eliminates the measurement drift that affects capacitive sensors in oil-wetted environments, where oil viscosity and contamination level vary with load and temperature.
• Hazardous area certification: ATEX-certified variants of the 330104 series are available for Zone 1 and Zone 2 installations, enabling deployment in gas turbine enclosures and compressor buildings classified as potentially explosive atmospheres without the need for intrinsic safety barriers in the signal circuit.
• Long cable run capability: When paired with the 330130 extension cable (available in 5 m, 9 m, and custom lengths), the system maintains calibrated sensitivity over total cable lengths up to 9 m from probe tip to driver input. This allows the driver to be mounted in a safe, accessible location while the probe remains in the hazardous bearing housing environment.
• Multi-parameter measurement from a single probe: A single 330104 probe installation can simultaneously provide radial vibration (AC component), shaft centerline position (DC component), and eccentricity data to the 3500/40M monitor — three protection parameters from one mechanical penetration, reducing the number of probe ports required in the bearing housing design.

Quality Assurance & Global Logistics

Every Bently Nevada 330104-11-17-10-01-00 unit supplied by siemensplc.com is sourced through verified channels with full supply-chain traceability. Prior to dispatch, each probe undergoes a structured pre-shipment inspection protocol: visual examination of the probe tip, cable jacket, and connector; impedance measurement of the probe coil to confirm it falls within the factory-specified range; and connector continuity verification. Units that do not meet these criteria are quarantined and not shipped.

Original manufacturer packaging is preserved where available. A Certificate of Conformance (CoC) is available on request for regulated industries including nuclear power, LNG, and petrochemical. Anti-counterfeit screening is applied to all units — a documented concern in the Bently Nevada aftermarket, where counterfeit 330104 probes with out-of-specification coil impedance have been identified in the field.

Logistics are managed from our warehouse in Xiamen, China, with access to DHL Express, FedEx International Priority, and UPS Worldwide Expedited services. Standard in-stock orders ship within 2–3 business days. For critical unplanned shutdowns, same-day dispatch is available for orders confirmed before 14:00 CST. Export documentation — including commercial invoice, packing list, and HS code 9031.80.90.90 classification — is prepared for all international shipments to facilitate customs clearance in the EU, North America, Southeast Asia, and the Middle East.

Contact Information

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