Bently Nevada 330103-08-13-10-02-05 Proximity Transducer – 3300 XL Series

330103-08-13-10-02-05 — Non-Contact Shaft Displacement Measurement in API 670 Machinery Protection Loops

The Bently Nevada 330103-08-13-10-02-05 is a factory-calibrated, eddy-current proximity transducer belonging to the 3300 XL 8mm Proximity Transducer System manufactured by Baker Hughes (formerly GE Bently Nevada). It is designed for continuous, non-contact measurement of radial shaft vibration and axial position in critical rotating machinery — gas turbines, steam turbines, centrifugal compressors, axial fans, and large motor-driven pumps — where API 670 5th Edition machinery protection requirements apply.

The part number is a deterministic configuration string. 330103 identifies the 3300 XL 8mm probe body assembly. 08 confirms the 8mm sensing tip diameter. 13 specifies the standard sensitivity range (7.87 V/mm / 200 mV/mil). 10 designates the connector interface style. 02 indicates an armored integral cable construction with stainless-steel braid over the coaxial assembly. 05 fixes the cable length at exactly 5 metres (16.4 ft). This encoding eliminates procurement ambiguity across facilities managing hundreds of measurement points on rotating equipment.

In a machinery protection loop, the probe mounts in a radial or axial bracket at a nominal gap of approximately 1.27 mm (50 mil) from the shaft surface. The companion driver module — Bently Nevada 330180 or 330130 — supplies −24 VDC excitation and demodulates the probe’s RF carrier into a DC voltage proportional to gap distance at a scale factor of 7.87 V/mm. That analog DC signal feeds directly into a 3500-series monitor card (3500/40M, 3500/42M, 3500/45, 3500/50M, or 3500/72M), which executes alarm and trip logic within deterministic scan cycles. The probe, extension cable, and driver must be treated as a matched, factory-calibrated system — substituting any element without recalibration invalidates the accuracy specification and the API 670 compliance of the loop.

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Technical Parameters

Hardware Logical Analysis

Eddy-Current Transduction Mechanism. The probe tip encloses a flat coil wound on a ferrite core. The 330180 driver energizes this coil at a carrier frequency in the 500 kHz – 2 MHz band (exact frequency is proprietary to the 3300 XL platform). As the coil approaches a conductive target, eddy currents are induced on the target surface, increasing the coil’s resistive loading and reducing its Q-factor. The driver’s synchronous demodulator converts this impedance shift into a linear DC voltage. The 8mm tip geometry produces a linear measurement range of 0.25–2.26 mm, which accommodates shaft diameters from approximately 50 mm to 500 mm in standard turbomachinery configurations without requiring tip geometry changes.

Triaxial Cable Architecture and Guard-Drive Topology. The armored cable assembly uses a triaxial conductor arrangement. The inner conductor carries the RF signal between probe coil and driver. The intermediate shield is actively driven at the same potential as the center conductor — a guard-drive configuration — which eliminates the distributed capacitance of the cable from the measurement circuit. This is the mechanism that preserves the flat frequency response to 10,000 Hz across the full 5 m cable run. A passive coaxial cable of equivalent length would exhibit a −3 dB rolloff well below 10 kHz due to the RC time constant formed by cable capacitance and source impedance. The outer stainless-steel armor provides mechanical protection against abrasion, crush loads during installation, and chemical attack from lubricating oils, steam condensate, and cleaning solvents.

Temperature-Compensated Scale Factor Stability. The 330180 driver incorporates matched NTC/PTC networks in the demodulator feedback path. These networks compensate for the temperature coefficient of the probe coil’s inductance and the driver’s gain stages, maintaining the 7.87 V/mm scale factor within ±1% across the full −35 °C to +177 °C probe operating range. In quantitative terms, a 1 µm change in shaft-to-probe gap produces a repeatable 7.87 µV output change — a resolution level sufficient for detecting sub-micron shaft displacement trends associated with bearing wear progression in precision turbomachinery.

Target Material Sensitivity and Field Recalibration. The factory calibration references AISI 4140 alloy steel as the nominal target. Targets with different electrical conductivity or magnetic permeability — including austenitic stainless steels, titanium alloys, Inconel, and aluminum — shift the effective scale factor by amounts that depend on the specific material properties. For non-standard targets, the 330180 driver supports field recalibration via front-panel adjustment potentiometers, allowing the scale factor to be trimmed to match the actual shaft material without hardware replacement. This capability is documented in Bently Nevada’s calibration procedure for the 3300 XL system.

Intrinsically Safe Configuration for Hazardous Areas. For ATEX Zone 0/1 or NEC Class I Division 1 installations, the 330103-08-13-10-02-05 operates in conjunction with the Bently Nevada 330850 Zener Barrier. The barrier limits the electrical energy available at the probe tip to below the minimum ignition energy of the classified atmosphere. The IS installation requires the cable run between the barrier and the probe to remain entirely within the hazardous area boundary, while the driver and 3500 monitor reside in the safe area. This architecture is defined in Bently Nevada’s certified IS installation drawings and must be implemented without modification to maintain ATEX/FM certification validity.

System Integration Benefits

• Continuous analog output with no sampling latency: The DC output is a real-time analog signal. The 3500-series monitor scans it at its full update rate — typically 5 ms per channel — enabling alarm and trip decisions within a single scan cycle. This response characteristic is not achievable with digital fieldbus sensors, which introduce protocol-dependent latency incompatible with API 670 response time requirements.
• Zero mechanical wear and extended service intervals: Non-contact measurement imposes no mechanical load on the shaft and involves no moving parts in the probe. Service life is governed by environmental exposure rather than mechanical fatigue, supporting continuous operation across multi-year maintenance intervals without probe replacement.
• Direct API 670 5th Edition compliance: The complete 3300 XL system — probe, driver, and 3500 monitor — carries API 670 certification. This eliminates the engineering qualification effort required to validate a non-standard sensor for machinery protection service in oil and gas facilities.
• Self-monitoring loop diagnostics via System 1: When integrated with Bently Nevada System 1 software, the probe’s DC output is continuously trended. The software detects probe gap drift, cable impedance degradation, and driver fault conditions, alerting maintenance personnel to instrumentation anomalies before they produce false trips or missed alarms.
• Matched-set calibration traceability: Each probe, cable, and driver is factory-calibrated as a matched set. Calibration data is recorded on the driver label and in the factory test report, providing the traceability documentation required by ISO 9001 quality systems and IEC 61511 functional safety lifecycle records.
• Multi-function monitor card compatibility: The probe output is compatible with the full 3500-series card range — 3500/40M (proximitor/seismic), 3500/42M, 3500/45 (position), 3500/50M (tachometer), and 3500/72M (temperature) — allowing a single probe type to serve radial vibration, axial position, and differential expansion measurement functions depending on the installed monitor card. This reduces spare-parts inventory complexity.
• Hazardous area certification without additional engineering analysis: ATEX and FM IS certifications allow direct installation in Zone 0/1 and Class I Division 1 areas. No site-specific hazardous area engineering study is required for the probe itself, reducing installation design time and cost.
• Mechanical integrity in turbomachinery environments: The 316 stainless steel housing and IP67 rating provide resistance to oil mist, steam, water ingress, and vibration-induced fatigue at the mounting bracket. The armored cable withstands the mechanical handling loads typical of installation in confined turbine enclosures and resists chemical degradation from lubricating oils and cleaning agents.
• Procurement and spare-parts management efficiency: The deterministic part number encoding eliminates configuration ambiguity during procurement. Facilities maintaining large populations of proximity measurement points can specify, order, and verify the exact configuration from the part number alone, without reference to separate configuration documents.

Quality Assurance & Global Logistics

Every Bently Nevada 330103-08-13-10-02-05 unit supplied by siemensplc.com is sourced through verified supply channels with full documentation integrity. Each unit ships in its original Baker Hughes / Bently Nevada factory packaging, accompanied by a Certificate of Conformance (CoC) referencing the unit serial number and calibration data, and the original factory test report where available. No refurbished, repackaged, or gray-market units are offered under any circumstances.

Our stocking warehouse is located in Xiamen, China, a primary international logistics hub with direct air freight connections to Singapore, Dubai, Frankfurt, Los Angeles, and Tokyo. In-stock units are dispatched within 1–3 business days of order confirmation. For unplanned outages or plant shutdowns requiring urgent parts, same-day dispatch is available for orders confirmed before 14:00 CST. International shipments are routed via DHL Express, FedEx International Priority, and UPS Worldwide Express, with typical transit times of 2–5 business days to destinations across Asia, Europe, the Middle East, and the Americas.

Export compliance is managed in-house. The 330103-08-13-10-02-05 is classified EAR99 for most commercial destinations, requiring no export license for standard shipments. For destinations subject to export controls, our compliance team prepares the required documentation before dispatch. All shipments include a commercial invoice, packing list, and certificate of origin. Payment terms include Telegraphic Transfer (T/T), Letter of Credit (L/C), and major credit cards. Volume pricing is available for orders of 5 units or more.

The 12-month warranty covers manufacturing defects and calibration drift exceeding the ±1% specification under normal operating conditions. Warranty claims are processed under a replacement-first policy: a replacement unit is dispatched before the defective unit is returned, minimizing plant downtime. Pre-shipment functional testing and dimensional inspection are available on request for quality-critical applications.

Contact Information

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