Bently Nevada 330104-00-04-50-02-00 Proximity Probe – 3300 XL Series

Bently Nevada 330104-00-04-50-02-00: 8mm Eddy-Current Proximity Probe for Critical Rotating Machinery Protection

The Bently Nevada 330104-00-04-50-02-00 is an 8mm eddy-current proximity probe belonging to the 3300 XL Series — a platform that has established itself as the de facto standard for shaft displacement and vibration measurement in API 670-governed machinery protection systems. This probe operates on the principle of electromagnetic induction: a high-frequency oscillating current (typically 1.0 MHz) is driven through a coil wound at the probe tip, generating an alternating magnetic field. When a conductive target — typically AISI 4140 or equivalent low-alloy steel — enters this field, eddy currents are induced on the target surface. The resulting energy absorption alters the coil’s impedance, and the Proximitor driver converts this impedance shift into a DC voltage output proportional to the gap distance between probe tip and target surface.

At a nominal sensitivity of 7.87 V/mm (200 mV/mil), the 330104-00-04-50-02-00 delivers a linear output across a measurement range of 0.25 mm to 2.26 mm (10 to 89 mil). This linearity is maintained within ±0.05 mm across the full operating temperature envelope of −35°C to +177°C at the probe body — a specification that directly supports deployment in hot-section turbine casings, compressor bearing housings, and other thermally demanding environments. The probe’s integral cable length of 0.5 m is designed to mate with a 5.0 m extension cable (e.g., 330130-080-00-00), maintaining the total system cable length within the calibrated range of the paired Proximitor driver.

In a typical machinery protection loop, this probe is mounted radially at the bearing journal to measure shaft centerline displacement (X-Y orbit), or axially to monitor thrust position. The DC output feeds directly into a Bently Nevada 3500 Series monitor card — such as the 3500/40M or 3500/42M — where the signal is processed against user-defined alert and danger setpoints. The deterministic signal chain, from probe tip to monitor relay output, is what makes this system architecture the preferred choice for SIL-rated machinery protection applications in oil and gas, power generation, and petrochemical facilities.

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Technical Parameters

Hardware Logical Analysis

The 330104-00-04-50-02-00 probe tip assembly is constructed with a precision-wound sensing coil encapsulated in a thermoplastic housing, hermetically sealed against ingress of process fluids, lubricating oils, and moisture. The coil geometry is optimized for the 8mm tip diameter to produce a field depth sufficient for the 0.25–2.26 mm linear range while minimizing sensitivity to adjacent conductive structures — a parameter known as proximity effect from nearby metal (PENM). This is particularly relevant in bearing housings where the probe is mounted in close proximity to the housing bore wall.

The cable assembly uses a coaxial construction with controlled characteristic impedance, matched to the Proximitor driver’s oscillator circuit. Any deviation in cable length from the calibrated system specification (integral + extension = total system cable) introduces a measurable shift in the driver’s output scale factor. The 330104 series integral cable of 0.5 m is therefore not interchangeable with other integral cable lengths without recalibration of the complete probe-cable-driver system.

From an EMC standpoint, the coaxial cable shield provides a continuous ground reference from the probe body to the Proximitor driver chassis, attenuating common-mode interference from variable-frequency drives, high-current bus bars, and RF sources common in industrial environments. The MIL-C-5015 style connector at the probe-to-extension cable junction provides a positive locking mechanism that resists vibration-induced loosening — a failure mode that produces characteristic noise artifacts in the displacement signal at frequencies unrelated to shaft rotation speed.

The probe body’s stainless steel outer sleeve provides mechanical protection and serves as the ground reference for the coaxial cable shield. The tip-to-housing dimensional tolerance is held to ±0.05 mm to ensure consistent gap calibration across interchangeable units within the same system loop, supporting field replacement without full system recalibration when the replacement probe is from the same calibrated system family.

System Integration Benefits

• Direct 3500 Series Compatibility: The probe’s output scale factor (200 mV/mil) is natively recognized by Bently Nevada 3500 monitor cards, eliminating the need for external signal conditioning or scaling adjustments during commissioning.
• API 670 Compliance: Full conformance to API 670 5th Edition ensures acceptance by major EPC contractor specifications and end-user machinery protection standards in oil and gas and power generation sectors.
• Deterministic Signal Latency: The analog DC output from the Proximitor driver provides a continuous, real-time displacement signal with no digital sampling latency — critical for machinery protection systems where relay trip response time is measured in milliseconds.
• Hazardous Area Deployment: When installed with the appropriate Bently Nevada Zener barrier or galvanic isolator, the system meets IECEx and ATEX requirements for Zone 1/Zone 2 hazardous area installations.
• Orbit Plot Capability: Paired X-Y probe installations using two 330104-00-04-50-02-00 units at 90° separation enable full shaft orbit analysis, providing diagnostic data on rotor dynamic behavior including sub-synchronous instability and oil whirl.
• Thermal Stability: The −35°C to +177°C operating range covers the full thermal envelope of most turbine and compressor bearing housings, including hot-section applications where probe body temperatures approach the upper limit during sustained high-load operation.
• Long-Term Calibration Stability: The encapsulated coil construction resists mechanical deformation and thermal cycling effects that would otherwise cause drift in the probe’s scale factor over time, supporting extended calibration intervals in accordance with plant maintenance schedules.
• Plug-and-Play Field Replacement: Dimensional and electrical interchangeability within the 3300 XL 8mm system family allows field replacement without loop recalibration, minimizing machinery downtime during maintenance windows.

Quality Assurance & Global Logistics

Every Bently Nevada 330104-00-04-50-02-00 unit supplied by siemensplc.com is sourced through verified supply channels and subjected to a structured incoming inspection protocol. Each unit undergoes part number and label verification against OEM documentation, visual inspection of the probe tip, cable jacket, and connector for physical integrity, and packaging condition assessment to confirm no transit damage has occurred. Functional continuity verification is performed on the coaxial cable assembly prior to shipment. Full traceability documentation — including source records and inspection reports — is available upon request for all orders.

Logistics operations are managed from Xiamen, China, with access to DHL Express, FedEx International Priority, and freight forwarding services for bulk or project shipments. Standard express delivery to major industrial hubs in Southeast Asia, the Middle East, Europe, and the Americas is typically achieved within 3–7 business days from order confirmation. Urgent project requirements can be accommodated with same-day or next-day dispatch for in-stock units. All shipments are packed in anti-static protective packaging appropriate for sensitive electronic components, with export documentation prepared in compliance with applicable customs regulations for the destination country.

Contact Information

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