Bently Nevada 330104-01-11-10-01-00 Proximity Probe – 3300 XL Series

Bently Nevada 330104-01-11-10-01-00: 8 mm Eddy-Current Proximity Probe for Continuous Shaft Monitoring

The Bently Nevada 330104-01-11-10-01-00 is an 8 mm eddy-current proximity probe belonging to the 3300 XL Proximity Transducer System. It is engineered for non-contact, continuous measurement of radial shaft vibration, axial position, and differential expansion on rotating machinery operating in demanding industrial environments. The probe forms the sensing element of a three-component calibrated system — probe, extension cable, and driver/oscillator — and is factory-matched to deliver a nominal sensitivity of 7.87 V/mm (200 mV/mil) across a linear measurement range of 0.25 mm to 2.25 mm.

The 330104 series carries the metric designation, with an M10 × 1 threaded body and a 1-metre integral coaxial cable terminated in a TNC connector. The part number suffix structure encodes cable length (01 = 1 m), tip configuration (11 = standard metric M10×1), target material calibration (10 = steel/iron), connector type (01 = TNC), and area classification (00 = standard, non-hazardous). This deterministic coding scheme allows procurement engineers to specify the exact mechanical and electrical configuration without ambiguity.

In turbomachinery protection architectures governed by API 670, the 330104-01-11-10-01-00 serves as the primary transducer for radial vibration channels on steam turbines, gas turbines, centrifugal compressors, and large motor-driven pumps. Its DC-coupled frequency response — flat from 0 Hz to 10,000 Hz — makes it equally suitable for static position measurement (thrust, differential expansion, eccentricity) and dynamic vibration acquisition, eliminating the need for separate sensor types on a single shaft.

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Technical Parameters

Hardware Logical Analysis

The 330104-01-11-10-01-00 operates on the Lenz’s law induction principle. The probe tip houses a flat coil wound on a ferrite core. The driver/oscillator (330180 or 330190 series) excites this coil at a carrier frequency in the range of 500 kHz to 2 MHz. When a conductive target enters the electromagnetic field, eddy currents are induced on the target surface, loading the coil and reducing its Q-factor. The driver circuit converts this impedance change into a DC-proportional output voltage, yielding a linear transfer function across the 2.0 mm measurement span.

EMC and Shielding Architecture: The integral coaxial cable uses a double-braid shield construction with 95% optical coverage, bonded to the probe body at the cable entry point. This configuration suppresses common-mode interference from adjacent power cables and variable-frequency drives — a critical requirement in turbine halls where 6 kV switchgear and large motor starters generate broadband conducted and radiated noise. The TNC connector provides a positive-locking, 50-ohm impedance-matched interface that maintains signal integrity across the full 10 kHz bandwidth without impedance discontinuities.

Thermal Stability: The ferrite core material is selected for low temperature coefficient of permeability across the −35 °C to +177 °C operating envelope. Sensitivity drift is specified at less than ±0.5% over the full temperature range when used with a matched 3300 XL driver, ensuring that alarm and trip setpoints remain valid without field recalibration during seasonal temperature swings or process upset conditions.

Mechanical Robustness: The probe body is machined from 316 stainless steel, providing resistance to hydrogen sulfide (H₂S), chloride-bearing process fluids, and steam condensate — environments common in refinery and LNG applications. The M10 × 1 thread pitch is coarser than the M8 × 0.75 used on earlier 3000 series probes, reducing the risk of thread galling during installation in stainless steel probe holders. A jam nut and locknut arrangement is standard, allowing precise gap setting and mechanical retention without probe rotation after final adjustment.

System Integration Benefits

• API 670 Fifth Edition Compliance: The 330104-01-11-10-01-00 is factory-calibrated as part of a matched probe-cable-driver system per API 670, the industry standard for machinery protection instrumentation. This eliminates the sensitivity uncertainty that arises when mixing components from different calibration batches.
• DC-Coupled Measurement for Dual-Purpose Channels: The flat frequency response from 0 Hz allows a single probe to simultaneously provide static position data (e.g., thrust position in micrometres) and dynamic vibration data (e.g., 1× and 2× running speed components) to the monitor rack, reducing channel count and wiring cost.
• Deterministic Latency in 3500 Rack Integration: When connected to a Bently Nevada 3500 series monitor, the probe signal is sampled at up to 65,536 samples per second per channel. The hardware-based trip logic in the 3500 rack processes the probe output with a worst-case response time of less than 20 ms from transducer input to relay output, meeting API 670 response time requirements without software intervention.
• Diagnostic Transparency via OK Circuit: The 3300 XL driver continuously monitors the probe coil impedance and cable continuity. If the probe gap moves outside the linear range, the cable is severed, or the driver supply voltage falls below threshold, the OK relay de-energises and the monitor channel enters a defined fault state. This self-diagnostic architecture prevents false-safe conditions where a failed sensor could mask a genuine machinery fault.
• Compatibility with System 1 Evolution Software: Probe output data is accessible in Bently Nevada System 1 Evolution for trend analysis, spectrum computation, and orbit plot generation. The 330104 probe’s calibrated sensitivity constant is stored in the driver module’s non-volatile memory and is automatically read by System 1 during configuration, eliminating manual sensitivity entry errors.
• Interchangeability Within the 3300 XL Family: All 330104 probes with the same suffix codes are interchangeable without recalibration, provided the matched extension cable and driver are also replaced as a set. This simplifies spare parts management: a single spare probe kit covers all 8 mm radial vibration channels on a given machine train.
• Hazardous Area Variant Availability: ATEX Zone 1 and IECEx-certified variants are available by modifying the approval suffix in the part number. The physical probe body and electrical characteristics are identical to the standard variant, allowing the same installation drawings and gap-setting procedures to be used across safe-area and hazardous-area installations.
• Long Cable Run Capability: The 3300 XL system supports total cable lengths (integral + extension) of up to 9 m without sensitivity correction, and up to 15 m with a documented sensitivity adjustment. This accommodates installations where the monitor rack is located in a remote instrument room, separated from the machine by long cable trays.

Quality Assurance & Global Logistics

Every Bently Nevada 330104-01-11-10-01-00 unit supplied by siemensplc.com is sourced through verified channels with full traceability documentation. Pre-shipment inspection covers visual examination of the probe body, thread condition, cable jacket integrity, and TNC connector pin alignment. Functional verification confirms output voltage at a known gap distance against the nominal 7.87 V/mm sensitivity curve. Units are supplied in original Bently Nevada packaging with calibration documentation where available.

Our warehouse is located in Xiamen, China — a major international port city with direct air freight connections to Singapore, Dubai, Frankfurt, Los Angeles, and Tokyo. Standard export documentation includes commercial invoice, packing list, and certificate of origin. For projects requiring ATEX/IECEx certification copies, material test reports, or third-party inspection, these are arranged at the quotation stage. Typical dispatch time for in-stock units is 1–3 business days after order confirmation. International express delivery (DHL, FedEx, UPS) reaches most destinations within 3–7 business days. Sea freight consolidation is available for bulk orders exceeding 50 units.

All units carry a 12-month warranty covering manufacturing defects and calibration drift beyond the specified ±1% sensitivity tolerance. Warranty claims are processed with a replacement-first policy to minimise plant downtime.

Contact Information

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