BENTLY NEVADA 330101-20-36-10-02-00 Proximity Probe – 3300 XL Series

BENTLY NEVADA 330101-20-36-10-02-00 — 8 mm Eddy-Current Proximity Probe for Continuous Shaft Displacement Monitoring

The BENTLY NEVADA 330101-20-36-10-02-00 is an 8 mm eddy-current proximity probe belonging to the 3300 XL Proximity Transducer System. Its primary function within a machinery protection loop is to deliver a continuous, non-contact DC voltage signal proportional to the gap between the probe tip and a conductive target surface — typically a rotating shaft journal. This signal feeds directly into a 3300 XL Proximitor® driver, which conditions and scales the output before transmission to a 3500-series monitor rack for alarm, trip, and data acquisition processing.

In practical control-loop terms, the probe occupies the sensing node of a closed-loop protection architecture. Its output linearity across the 0.25–2.54 mm (10–100 mil) measurement range determines the accuracy of radial vibration amplitude, shaft centerline position, and axial thrust displacement values that the protection system acts upon. Any non-linearity, thermal drift, or impedance mismatch at this node propagates directly into trip-setpoint accuracy — making probe selection and system matching a critical engineering decision, not a commodity choice.

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Technical Parameters

Hardware Logical Analysis

The 330101-20-36-10-02-00 operates on the principle of electromagnetic induction. The probe tip houses a wound coil driven by a high-frequency oscillator (typically 1.0 MHz) embedded in the matched Proximitor® driver. When the probe tip approaches a conductive target, eddy currents are induced on the target surface, loading the oscillator circuit and reducing its amplitude. This amplitude change is demodulated and scaled to produce the −1 to −18 VDC output — a monotonically decreasing function of gap distance.

EMC Design Architecture: The integral stainless-steel armored cable serves a dual mechanical and electromagnetic function. The armor braid provides a continuous Faraday shield from probe body to driver input, suppressing capacitively coupled interference from adjacent high-voltage cables, VFD switching transients, and RF sources common in turbine halls. The coaxial geometry maintains a controlled characteristic impedance along the cable run, preventing signal reflections that would introduce measurement error at frequencies above 1 kHz — relevant for blade-pass and gear-mesh frequency analysis.

Thermal Stability: The probe coil assembly uses a thermally compensated winding geometry. Sensitivity drift across the −35 °C to +177 °C operating range is held within ±0.5% of nominal 7.87 V/mm, achieved through matched thermal expansion coefficients between the coil former, potting compound, and housing alloy. This is particularly significant in hot-section bearing pedestal installations where ambient temperatures can exceed 120 °C during steady-state operation.

System Impedance Matching: The 330101-20-36-10-02-00 is factory-calibrated as a matched set with its designated extension cable and Proximitor® driver. The three-component system (probe + extension cable + driver) is characterized together to achieve the published ±0.25% sensitivity tolerance. Substituting unmatched cables or drivers from different calibration batches degrades this tolerance to ±5% or worse — a critical consideration for API 670 compliance verification.

Non-Contact Wear Profile: Unlike contact-type displacement sensors (LVDTs, potentiometers), the eddy-current probe has zero mechanical interaction with the target. There is no wear mechanism, no lubrication requirement, and no minimum shaft speed threshold for valid measurement. The probe delivers valid DC gap data from 0 RPM through full operating speed, enabling static shaft position checks during barring-gear operation and dynamic vibration capture at rated speed within the same hardware channel.

System Integration Benefits

• Direct API 670 Compliance: The 3300 XL system is explicitly referenced in API 670 (5th Edition) as a qualified transducer system. Specifying this probe eliminates the need for third-party compliance verification, reducing engineering documentation burden during plant commissioning and insurance audits.
• Deterministic Signal Latency: The probe-to-driver signal path introduces less than 50 µs of group delay across the DC–10 kHz bandwidth. This latency budget is well within the 3500-series monitor’s 1 ms trip response time, ensuring that the protection system’s overall response time is governed by the monitor logic, not the sensor chain.
• Dual-Variable Measurement from a Single Channel: A single 330101-20-36-10-02-00 installation simultaneously provides radial vibration (AC component, filtered above 1 Hz) and shaft centerline position (DC component). This eliminates the need for separate static position sensors on machines where both parameters must be monitored per API 670 Table 1.
• Plug-Compatible with 3500 Rack Architecture: The probe output interfaces directly with 3500/40M, 3500/42M, and 3500/45 monitor modules without signal conditioning adapters. Rack configuration is handled entirely in the 3500 System software, with no hardware jumpers or potentiometer adjustments required at the field terminal.
• Diagnostic Transparency via Gap Voltage: The raw DC gap voltage (−1 to −18 VDC) is accessible at the Proximitor® driver output terminal. Maintenance technicians can verify probe installation gap, cable continuity, and driver health with a standard digital multimeter — without interrupting the protection system or requiring specialized test equipment.
• Hazardous Area Deployment: ATEX and IECEx certifications (suffix-dependent) permit installation in Zone 1 and Zone 2 classified areas, covering the majority of petrochemical compressor trains and offshore platform machinery spaces where proximity monitoring is mandated.
• Backward Compatibility with Legacy 3300 Infrastructure: The 3300 XL probe is electrically compatible with first-generation 3300 Proximitor® drivers when the correct extension cable is used. This allows phased upgrades of aging machinery protection systems without full rack replacement — a significant capital expenditure reduction in brownfield plant modernization projects.
• Traceable Factory Calibration: Each probe ships with a factory calibration record documenting sensitivity, linearity, and temperature coefficient measured against NIST-traceable standards. This documentation satisfies the calibration traceability requirements of ISO 9001, ISO 55001 (asset management), and most plant quality management systems without additional third-party calibration at incoming inspection.

Quality Assurance & Global Logistics

Every BENTLY NEVADA 330101-20-36-10-02-00 unit supplied by siemensplc.com is sourced through verified industrial distribution channels with full batch traceability. Incoming units undergo a structured inspection protocol before dispatch:

• Visual inspection of probe body, cable armor integrity, and connector condition against OEM dimensional tolerances
• Coil impedance measurement at 1 kHz to verify winding continuity and absence of moisture ingress
• Cable shield continuity check from probe body to connector termination
• Original manufacturer packaging, labeling, and date-code verification
• Certificate of Conformance (CoC) issued with each shipment; batch records retained for 5 years

Logistics are managed from our Xiamen, China operations center. Standard export documentation — commercial invoice, packing list, Certificate of Origin — is prepared for every international shipment. Carrier options include DHL Express (2–4 business days to most destinations), FedEx International Priority, and sea freight for volume orders. Customs HS code classification and export licensing support are provided as standard. For plant shutdown emergencies, same-day dispatch is available for in-stock units when orders are confirmed before 14:00 CST.

Contact Information

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