Bently Nevada 330104-00-07-05-02-CN Proximity Transducer – 3300 XL Series

Bently Nevada 330104-00-07-05-02-CN: 8mm Eddy Current Proximity Transducer for Critical Rotating Machinery Protection

The Bently Nevada 330104-00-07-05-02-CN is an 8mm eddy current proximity transducer belonging to the 3300 XL Proximity Transducer System — a platform engineered specifically for continuous, non-contact measurement of radial shaft vibration, axial position, and differential expansion on critical rotating equipment. This unit carries the -CN certification suffix, indicating compliance with Chinese national electromagnetic compatibility and industrial safety standards, making it the correct specification for installations subject to GB/T regulatory requirements within the People’s Republic of China.

In a machinery protection loop, the proximity transducer is the first element in the signal chain. Its output fidelity directly determines the accuracy of every downstream decision — from alarm setpoint evaluation to automatic trip logic. The 330104-00-07-05-02-CN operates on the eddy current principle: a high-frequency oscillator (typically 1.0 MHz) embedded in the probe tip generates an electromagnetic field. When a conductive target (shaft) enters this field, eddy currents are induced on the shaft surface, loading the oscillator circuit and producing a proportional change in output voltage. The resulting DC-coupled analog signal spans −1 VDC to −21 VDC across the linear measurement range, with a nominal scale factor of 7.87 V/mm (200 mV/mil).

The -07 extension cable code specifies a 200 mm (7.87 in) armored extension cable, providing the mechanical flexibility needed to route the probe from the bearing housing to the junction box or Proximitor enclosure without imposing excessive bending stress on the probe body. The -05 driver cable code designates a 5-meter (16.4 ft) interconnect cable between the extension cable and the 3300 XL driver electronics. This cable length is the most common field configuration, balancing signal attenuation against installation reach in standard turbomachinery enclosures. The -02 connector code identifies the standard coaxial connector termination used throughout the 3300 XL system family.

The complete measurement system — probe, extension cable, and driver — is factory-calibrated as a matched set. Substituting individual components from different calibration batches without recalibration will introduce scale factor error. When ordering replacement probes, always verify that the driver (Proximitor) in service is calibrated to the same system configuration. The 330104-00-07-05-02-CN is designed to interface directly with the Bently Nevada 3300 XL 8mm Driver (part number 330180 series), which conditions the raw oscillator signal into a buffered output suitable for input to the Bently Nevada 3500 Series or System 1 monitoring racks.

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Technical Parameters

Hardware Logical Analysis

The 330104-00-07-05-02-CN probe body houses a precision-wound coil embedded in a thermoplastic tip, potted with epoxy compound rated for continuous immersion in turbine oil and exposure to process gases. The coil geometry is matched to the 8mm tip diameter to produce a field depth of approximately 2× the probe diameter — roughly 16 mm — which defines the effective sensing zone and determines the minimum shaft diameter for accurate measurement (typically ≥25 mm for 8mm probes).

EMC Design: The armored extension cable uses a double-shielded coaxial construction: an inner braid shield referenced to the probe body ground, and an outer foil shield connected at the driver end only. This single-point grounding topology eliminates ground loop currents that would otherwise appear as low-frequency noise on the output signal — a critical consideration in large turbomachinery installations where ground potential differences between the machine frame and the control room can reach several volts. The cable armor provides additional mechanical protection against abrasion and rodent damage in field installations.

Thermal Stability: The oscillator circuit within the probe tip is temperature-compensated to maintain scale factor accuracy within ±1% across the full operating temperature range of −35°C to +121°C. This is achieved through the selection of NP0/C0G ceramic capacitors in the resonant tank circuit, which exhibit near-zero temperature coefficient of capacitance. Without this compensation, a 100°C temperature swing would introduce a scale factor drift of approximately 3–5% in an uncompensated design — sufficient to cause false alarms or missed trips in a tightly configured protection system.

Signal Integrity at High Frequency: The 10 kHz flat frequency response (−3 dB) is achieved by controlling the distributed capacitance of the extension and driver cables. The 200 mm extension cable length (Code -07) is specifically chosen to keep total system capacitance within the range that the 3300 XL driver’s output stage can drive without phase lag at the upper measurement frequency. Longer extension cables (e.g., Code -50 at 5 m) require a correspondingly shorter driver cable to maintain total system capacitance within specification — a constraint that is factory-verified during system calibration.

System Integration Benefits

• Direct API 670 compliance: The 330104-00-07-05-02-CN meets the measurement accuracy, frequency response, and environmental requirements of API 670 without additional field calibration, simplifying documentation for new installations and insurance audits.
• Deterministic analog output: The DC-coupled voltage output eliminates the latency inherent in digital fieldbus transducers. The monitoring system receives a real-time analog signal with no protocol overhead, ensuring that trip response time is bounded only by the monitor’s processing cycle — typically <1 ms for the 3500 Series.
• Plug-compatible replacement: The 330104-00-07-05-02-CN is dimensionally and electrically identical to previous 330104 variants with the same cable codes, allowing field replacement without modifying cable routing, conduit fill, or monitor configuration.
• Dual-measurement capability: A single probe installation can simultaneously provide radial vibration (AC component) and shaft centerline position (DC component) to the monitoring system, reducing the number of penetrations required in the bearing housing and simplifying the overall instrumentation design.
• Diagnostic transparency: The 3300 XL system’s OK relay output provides a continuous hardware health indication. If the probe gap moves outside the linear range, the supply voltage drops, or the cable is open-circuited, the OK relay de-energizes — providing a distinct, unambiguous fault signal that is separate from the vibration alarm and trip channels.
• Compatibility with System 1 software: When connected to a 3500 Series rack with System 1 integration, the 330104-00-07-05-02-CN’s output feeds into trend logging, spectrum analysis, and orbit plot generation — enabling predictive maintenance decisions based on historical vibration signatures rather than threshold-only protection.
• Reduced installation commissioning time: Factory-matched probe/cable/driver sets ship with a calibration certificate that includes the measured scale factor and linearity data. This eliminates the need for on-site calibration equipment and reduces commissioning time by 4–8 hours per measurement point compared to generic eddy current systems requiring field calibration.
• Long-term spare parts availability: The 3300 XL platform has been in continuous production for over two decades. Bently Nevada maintains backward compatibility across probe generations, ensuring that 330104-00-07-05-02-CN units sourced today will remain compatible with existing installed drivers and monitors for the foreseeable future.

Quality Assurance & Global Logistics

Every Bently Nevada 330104-00-07-05-02-CN unit supplied by siemensplc.com is sourced through verified industrial supply channels and subjected to incoming inspection before dispatch. Inspection covers physical integrity of the probe tip and connector, cable continuity and shield resistance, and output voltage verification at a known gap distance using a calibrated test fixture. Units that do not meet OEM specification are quarantined and not shipped.

All stock is held at our warehouse in Xiamen, China — a major international logistics hub with direct access to DHL, FedEx, UPS, and SF Express international services. In-stock orders placed before 14:00 CST are typically dispatched the same business day. Standard express delivery to Southeast Asia, the Middle East, and Europe runs 3–5 business days. North American destinations are typically 5–7 business days via express air freight. For large-volume orders, sea freight consolidation from Xiamen Port is available with full export documentation including commercial invoice, packing list, certificate of conformance, and country-of-origin certificate.

All products carry a 12-month warranty from the date of shipment, covering manufacturing defects and premature failure under normal operating conditions. Warranty claims are processed with a replacement-first policy to minimize equipment downtime. Traceability documentation — including batch records and test reports — is available upon request for quality-critical installations.

Contact Information

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