Bently Nevada 330904-00-22-05-01-00 Proximity Transducer – 3300 XL NSv

Bently Nevada 330904-00-22-05-01-00 — 8 mm Eddy-Current Proximity Transducer with Armored 5 m Extension Cable, 3300 XL NSv Series

The 330904-00-22-05-01-00 is an 8 mm eddy-current proximity transducer assembly from Bently Nevada’s 3300 XL NSv (Non-Standard voltage) product family. It is designed for continuous, non-contact measurement of shaft radial vibration, axial position, and differential expansion in rotating machinery protection systems. The assembly ships as a matched set: probe body, integral armored extension cable (5 m, suffix -01), and factory-calibrated to the NSv output voltage range. This matched-set architecture eliminates field calibration variables and ensures measurement chain traceability from the probe tip to the monitor input terminal.

In a machinery protection loop, this transducer occupies the first measurement node. Its output feeds directly into a 3300 XL 8 mm Proximitor® Sensor driver, which conditions the raw eddy-current signal into a buffered DC voltage proportional to gap distance. That conditioned signal then enters a 3500-series monitor card for alarm processing, relay actuation, and DCS/SCADA data transmission. The accuracy of every downstream decision — trip setpoints, alarm thresholds, trend analysis — depends on the dimensional and electrical stability of this probe assembly.

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Technical Parameters

Hardware Logical Analysis

The 330904-00-22-05-01-00 operates on the principle of electromagnetic induction. The probe coil, driven by a high-frequency oscillator within the Proximitor® driver (typically 1.0 MHz carrier), generates an alternating magnetic field at the probe tip. When a conductive target enters this field, eddy currents are induced on the target surface, loading the oscillator circuit and reducing coil impedance. The driver converts this impedance change into a DC voltage output linearly proportional to the probe-to-target gap. The NSv designation specifies that the output voltage range (−2 V to −18 V) is calibrated for backward compatibility with legacy 3300-series monitor input cards, preserving existing infrastructure without requiring monitor replacement or recalibration.

Armored Cable Design (suffix -01): The stainless steel armor layer provides mechanical protection against abrasion, rodent damage, and conduit pull-through forces. The armor is electrically isolated from the signal conductors via a PTFE dielectric layer, preventing armor-induced ground loops that would introduce low-frequency noise into the measurement signal. In high-vibration environments — such as compressor skid cable trays — the armor also acts as a strain-relief element, reducing fatigue stress at the probe body junction.

EMC Architecture: The coaxial cable geometry provides inherent common-mode rejection. The outer shield, grounded at the driver end only (single-point grounding), suppresses capacitively coupled interference from adjacent power cables and variable-frequency drives (VFDs). The 3300 XL system specifies a maximum allowable shield resistance to maintain this rejection ratio; the factory-matched 5 m cable length ensures the shield resistance remains within specification without field measurement.

Matched-Set Calibration: Bently Nevada calibrates probe, extension cable, and driver as a matched set. The extension cable’s distributed capacitance and resistance are factored into the scale factor trim at the driver. Substituting a non-matched cable — even of identical nominal length — shifts the effective scale factor by up to ±3%, which translates directly into a proportional error in vibration amplitude readings. This is particularly critical for API 670 trip setpoints where measurement uncertainty must be accounted for in the overall protection system accuracy budget.

Thermal Stability: The probe coil is wound on a ceramic bobbin with a low thermal coefficient of inductance. Over the operating range of −35 °C to +121 °C, the scale factor drift is specified at less than ±0.5% of full scale, ensuring that alarm setpoints established at ambient temperature remain valid at elevated bearing housing temperatures without recalibration.

System Integration Benefits

• Direct backward compatibility with 3300-series monitors: The NSv output range eliminates the need to replace existing monitor cards when upgrading probe assemblies, reducing capital expenditure and system downtime during maintenance windows.
• Plug-and-play replacement for 330900-series probes: Dimensional and electrical equivalence allows direct substitution without modifying mounting hardware, conduit runs, or monitor configuration parameters.
• Deterministic frequency response to 10,000 Hz: Supports accurate capture of sub-synchronous instabilities (oil whirl at 0.43–0.48×), synchronous (1×) unbalance, and super-synchronous harmonics up to the 10th order at 60,000 RPM, covering the full diagnostic frequency range required by API 670.
• Single-point grounding architecture: Eliminates ground loop interference paths that degrade signal-to-noise ratio in multi-machine installations sharing a common instrument ground bus.
• Armored cable for harsh routing environments: Reduces cable replacement frequency in high-abrasion installations, lowering lifecycle maintenance cost and unplanned outage risk.
• Factory-matched calibration traceability: Each assembly ships with a calibration certificate traceable to NIST standards, satisfying quality management system requirements under ISO 9001 and API 670 documentation clauses.
• Wide operating temperature envelope: Probe and cable specifications cover cryogenic service (LNG compressors, −35 °C) through high-temperature steam turbine bearing housings (+121 °C) within a single part number, simplifying spare parts inventory management.
• Compatibility with 3500/42 Proximitor®/Seismic Monitor: Output signal format is directly accepted by the 3500/42 input card without signal conditioning adapters, preserving the full 24-bit ADC resolution of the monitor for high-fidelity waveform capture and orbit plot generation.
• Supports continuous online monitoring: DC-coupled output allows static gap (axial position, differential expansion) measurement simultaneously with dynamic vibration measurement on the same channel, eliminating the need for separate position transducers on machines with combined radial/axial monitoring requirements.
• Reduced commissioning time: Factory-matched sets eliminate the field calibration step required when mixing probe and cable lots, reducing commissioning labor by approximately 30–45 minutes per measurement point on large turbine trains with 16–24 measurement channels.

Quality Assurance & Global Logistics

Every 330904-00-22-05-01-00 unit supplied by siemensplc.com is sourced through verified industrial automation distribution channels with documented supply chain traceability. Pre-shipment inspection includes visual verification of OEM labeling, date code, and country-of-origin markings; continuity and insulation resistance testing on the probe cable and connector; and confirmation of the factory calibration certificate. Units are packaged in anti-static foam with humidity indicator cards and sealed in moisture-barrier bags for long-haul air freight.

Logistics operations are based in Xiamen, China, with access to direct air freight lanes to major industrial hubs including Houston, Rotterdam, Singapore, Dubai, and Seoul. Standard in-stock lead time is 3–7 business days via DHL Express or FedEx International Priority. EXW Xiamen terms are available for customers with established freight forwarder relationships. For urgent plant shutdown requirements, same-day dispatch is available for orders confirmed before 14:00 CST.

A 12-month warranty covers manufacturing defects and electrical performance against published specifications. Warranty claims are processed with advance replacement to minimize plant downtime. Certificate of conformance and material test reports are available upon request for quality management system documentation.

Contact Information

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