Bently Nevada 22810-00-05-10-02 Proximity Probe – 3300 XL Series

Bently Nevada 22810-00-05-10-02 — Eddy-Current Proximity Probe for Continuous Shaft Displacement Measurement

The Bently Nevada 22810-00-05-10-02 is a 5 mm eddy-current proximity probe belonging to the 3300 XL measurement system. Its primary function within a machinery protection control loop is the non-contact, continuous acquisition of shaft radial displacement, axial position, and differential expansion data. Unlike accelerometers that measure vibration velocity or acceleration at the bearing housing, this probe measures the actual air gap between the probe tip and the rotating shaft surface — a direct indicator of rotor dynamic behavior. The output is a DC-biased analog voltage signal whose instantaneous value encodes shaft position and whose AC component encodes vibration amplitude and frequency content up to 10,000 Hz. This signal is fed directly into a Bently Nevada 3300 XL Proximitor driver, which conditions and scales it before transmission to a 3500-series monitor for alarm, trip, and data acquisition functions. In turbine protection architectures, this measurement chain forms the first layer of machinery protection, operating independently of the DCS and capable of issuing a turbine trip signal within milliseconds of a threshold exceedance.

The 22810 series was designed as a compact-format alternative to the standard 8 mm 3300 XL probe family. The 5 mm tip diameter allows installation in bearing housings and probe brackets where radial clearance is insufficient for larger probe bodies — a common constraint in older turbine designs and compact compressor trains. The 10-meter factory-terminated cable (option code -10 in the part number) eliminates the need for a field-installed extension cable in most standard installations, reducing the number of coaxial connectors in the signal path and the associated risk of impedance discontinuities that degrade signal fidelity at high frequencies.

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Technical Parameters

Hardware Logical Analysis

The operating principle of the 22810-00-05-10-02 is based on the Lenz’s Law response of a conductive target to a high-frequency oscillating magnetic field. The probe coil, driven by the Proximitor at approximately 1.0 MHz, generates an electromagnetic field that penetrates the target surface to a depth governed by the skin effect formula: δ = √(2ρ / ωμ), where ρ is target resistivity, ω is angular frequency, and μ is magnetic permeability. For AISI 4140 steel at 1 MHz, the effective penetration depth is approximately 8–12 μm. As the air gap between probe tip and shaft surface changes, the eddy-current loading on the coil changes, which alters the coil’s effective impedance. The Proximitor detects this impedance shift and converts it to a proportional DC voltage output at the scale factor of 7.87 V/mm.

The 5 mm coil geometry produces a sensing field diameter of approximately 2× the tip diameter (≈10 mm effective sensing zone). This geometry imposes a minimum shaft diameter requirement of approximately 25 mm to avoid edge effects that introduce nonlinearity at the extremes of the measurement range. For shafts below this diameter, Bently Nevada recommends the 3300 XL 3 mm series. The 10 m integrated cable is a coaxial assembly with a characteristic impedance matched to the Proximitor input, ensuring that the cable does not act as a transmission line discontinuity at the operating frequency. The factory termination uses a precision BNC connector with a PTFE dielectric, maintaining impedance consistency to within ±1 Ω across the operating temperature range.

EMC performance is achieved through the coaxial cable’s continuous shield, which provides greater than 60 dB of common-mode rejection for conducted interference in the 50 Hz–100 kHz band. The probe body’s 316 stainless steel construction provides a Faraday shield effect for the coil assembly, attenuating radiated EMI from adjacent high-voltage switchgear and variable-frequency drives — a critical design requirement in compressor stations where VFDs operate in close proximity to instrumentation. The armored cable jacket provides additional mechanical protection against abrasion and rodent damage in cable trays, and the IP67 rating ensures the probe body can withstand direct water jet exposure during turbine hall washdowns without moisture ingress to the coil cavity.

System Integration Benefits

• Deterministic analog output latency: The eddy-current measurement chain from shaft displacement to Proximitor output voltage has a signal propagation delay of less than 100 μs, ensuring that the 3500-series monitor receives updated position data well within the 1 ms scan cycle required for API 670-compliant trip response.
• Zero mechanical wear: Non-contact measurement eliminates probe-to-shaft contact, removing the wear mechanism that limits the service life of contact-type displacement sensors. Mean time between replacement is determined by environmental degradation of the cable jacket rather than any mechanical wear mechanism.
• Direct integration with 3500 system diagnostics: The Proximitor output includes a gap voltage that the 3500/42M monitor uses to verify probe installation gap (nominally –10 VDC at 1.0 mm gap). An out-of-range gap voltage triggers a Not OK (NOK) status flag, providing continuous self-diagnostic transparency without requiring manual probe inspection.
• Dual-plane vibration measurement capability: Two 22810-00-05-10-02 probes mounted at 90° (X-Y configuration) per bearing journal provide the orthogonal displacement signals required to compute shaft orbit plots — a diagnostic tool that distinguishes rotor imbalance, misalignment, oil whirl, and rub conditions by orbit shape analysis.
• Compatibility with Bently Nevada System 1 software: The analog output is fully compatible with the System 1 condition monitoring platform via the 3500 rack’s Ethernet gateway, enabling trend logging, alarm management, and spectral analysis without additional signal conditioning hardware.
• Scalable to SIL-capable architectures: When integrated with a 3500 rack configured for IEC 61511 functional safety, the measurement loop can be assigned a Safety Integrity Level (SIL) rating as part of a Safety Instrumented System (SIS) for turbine overspeed or high-vibration trip functions.
• Reduced installation commissioning time: The factory-calibrated scale factor (7.87 V/mm ± 0.5%) eliminates the need for field calibration of the probe-cable-Proximitor assembly. The technician sets the installation gap to achieve the nominal –10 VDC output and the system is ready for service without additional adjustment.
• Wide operating temperature range for hot-section installations: The –35°C to +177°C rating allows probe installation in bearing housings adjacent to steam turbine exhaust casings and gas turbine hot-section bearing pedestals, where ambient temperatures routinely exceed the limits of standard industrial instrumentation.

Quality Assurance & Global Logistics

Each Bently Nevada 22810-00-05-10-02 unit dispatched from our Xiamen, China facility is sourced from verified authorized distribution channels with full manufacturer traceability. Prior to shipment, every unit undergoes a structured pre-dispatch verification protocol: visual inspection of the probe tip, cable jacket, and BNC connector against OEM cosmetic acceptance criteria; electrical continuity and shield integrity verification using calibrated test equipment; and gap voltage output check against the nominal scale factor to confirm the probe-cable assembly is within specification. A documentation package including the certificate of conformance and original manufacturer datasheet accompanies each shipment.

Logistics from Xiamen are handled via DHL Express, FedEx International Priority, and UCP air freight, with typical transit times of 3–5 business days to Europe, 4–6 business days to North America, and 2–3 business days to Southeast Asia. All shipments are packed in anti-static foam inserts within double-wall cartons with moisture-barrier inner bags, conforming to ISTA 2A transit testing standards. Export documentation including commercial invoice, packing list, and HS code 9026.80 classification is prepared for each shipment to facilitate customs clearance. Expedited same-day dispatch is available for orders confirmed before 14:00 CST.

Contact Information

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