Bently Nevada PR6423/010-110 CON021 Proximity Transducer – 3300 XL Series

Bently Nevada PR6423/010-110 CON021 — Non-Contact Eddy Current Proximity Transducer for Rotating Machinery Protection

The PR6423/010-110 CON021 is a precision eddy current proximity transducer manufactured by Bently Nevada (a Baker Hughes company), designed as a primary sensing element within the 3300 XL Proximity Transducer System. Its function within a machinery protection loop is unambiguous: it converts the physical gap between the probe tip and a conductive target shaft into a proportional DC voltage signal, enabling continuous, non-contact measurement of radial shaft vibration and axial position displacement with sub-micron resolution.

In a typical turbomachinery protection architecture — whether a steam turbine, centrifugal compressor, or large induction motor — the PR6423/010-110 CON021 is mounted in a radial bearing housing bracket, positioned at a nominal gap of 1.0 mm to 2.0 mm from the shaft surface. The transducer operates in conjunction with a 3300 XL Proximitor signal conditioner, which supplies the oscillator drive frequency (typically 1.0 MHz) and demodulates the impedance-modulated return signal into a calibrated output of −7.87 V/mm (−200 mV/mil). This output feeds directly into a 3500 Series Machinery Protection System monitor card, where alarm and danger setpoints are enforced in hardware with deterministic response times under 20 ms.

The CON021 suffix designates the specific armored integral cable and connector configuration for this probe assembly. The cable jacket is constructed from a fluoropolymer compound rated for continuous immersion in turbine oil, hydraulic fluid, and coolant mist environments. The connector termination is a precision-machined, gold-plated coaxial interface that maintains signal integrity across the full operating temperature range without requiring field re-torquing or periodic re-termination.

This unit is stocked and dispatched from Xiamen, China, with full export documentation. All units undergo incoming inspection against Bently Nevada factory acceptance criteria before dispatch. A 12-month functional warranty applies to every shipment.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The PR6423/010-110 CON021 operates on the principle of electromagnetic induction impedance modulation. The Proximitor oscillator drives a high-frequency AC current through the probe coil, generating a localized electromagnetic field at the probe tip. When a conductive target enters this field, eddy currents are induced on the target surface, loading the coil and reducing its effective Q-factor. The Proximitor demodulates this impedance change into a linear DC voltage proportional to the probe-to-target gap.

EMC Design Architecture: The PR6423 probe body is constructed with a mu-metal shielding sleeve around the coil former, which confines the electromagnetic field to the axial sensing direction and suppresses lateral cross-talk from adjacent metallic structures. This is critical in bearing housings where multiple probes are mounted within 30–50 mm of each other. The shielding reduces inter-probe coupling to below −40 dB, ensuring that X-Y probe pairs produce orthogonal, uncorrelated signals — a prerequisite for accurate orbit plot generation in the 3500 monitor.

Cable Impedance Matching: The CON021 armored cable is manufactured to a controlled characteristic impedance of 50 Ω ± 2%, matched to the Proximitor input stage. Impedance discontinuities in the cable — caused by mechanical damage, excessive bending radius, or connector corrosion — introduce reflections that shift the effective scale factor by up to ±3%, which can cause false alarm conditions or missed danger trips. The armored jacket (stainless steel braid over fluoropolymer) maintains the cable geometry under mechanical stress, preserving impedance consistency across the full cable length.

Thermal Stability: The probe coil former is wound on a ceramic substrate with a thermal expansion coefficient matched to the coil wire alloy. This minimizes gap-equivalent thermal drift to less than 0.025 mm/°C across the −35°C to +120°C operating range. In high-temperature applications such as steam turbine bearing pedestals, where ambient temperatures at the probe mounting bracket can reach 80–100°C, this thermal stability prevents false axial position drift readings that would otherwise trigger spurious thrust bearing alarms.

Connector Integrity (CON021): The CON021 connector uses a precision-machined gold-plated center pin with a PTFE dielectric insert. Gold plating (minimum 1.27 µm per MIL-G-45204) prevents oxidation-induced contact resistance increase, which is the primary failure mode for coaxial connectors in humid or oil-mist environments. The connector body is stainless steel with a captive coupling nut, rated for 500 mating cycles without measurable degradation in contact resistance.

System Integration Benefits

• Deterministic alarm response: When connected to a 3500 Series monitor, the PR6423/010-110 CON021 signal path delivers hardware-enforced alarm and danger trip decisions in under 20 ms — independent of host DCS scan cycle time, eliminating software latency as a protection gap.
• Orbit plot fidelity: The matched scale factor (−7.87 V/mm ±0.5%) between X and Y probe pairs ensures that shaft orbit plots generated in System 1 software accurately represent true shaft centerline motion, enabling reliable diagnosis of oil whirl, misalignment, and rub conditions.
• Direct 3500 monitor compatibility: The PR6423 series is the factory-specified transducer for 3500/40M and 3500/42M monitor cards. No recalibration or scale factor adjustment is required when replacing a like-for-like unit, reducing maintenance downtime to the time required for physical probe replacement and gap setting.
• Diagnostic transparency via Keyphasor integration: When used alongside a Keyphasor transducer in the 3500 rack, the PR6423 output enables synchronous sampling for 1X and 2X vibration vector tracking, providing phase-referenced amplitude data that distinguishes mass imbalance from structural resonance without requiring a separate spectrum analyzer.
• Redundant voting logic support: In 2oo3 (two-out-of-three) voting protection architectures, three PR6423 probes can be wired to separate 3500 monitor channels. The 3500 rack’s internal voting logic compares all three signals and requires agreement from at least two channels before issuing a trip, eliminating single-sensor false trips while maintaining protection integrity.
• Axial position monitoring precision: For thrust bearing protection, the PR6423 mounted in the axial direction provides position resolution of ±0.025 mm, sufficient to detect thrust collar wear rates of 0.1 mm/hour — well within the response time needed to prevent catastrophic thrust bearing failure in high-speed compressors.
• Hazardous area deployment: ATEX certification allows installation in Zone 1 and Zone 2 classified areas (consult specific revision datasheet for Ex category and group). This eliminates the need for separate intrinsically safe barriers in most petrochemical and offshore applications, simplifying the installation wiring design.
• Long-term signal baseline stability: The ceramic coil former and controlled cable impedance maintain a consistent scale factor over the product service life (typically 10–15 years in continuous operation), enabling meaningful trend comparison of vibration amplitude data across multiple maintenance intervals without recalibration corrections.

Quality Assurance & Global Logistics

Every PR6423/010-110 CON021 unit dispatched from our Xiamen facility is sourced from verified supply channels with full traceability to Bently Nevada factory production batches. Incoming inspection covers three mandatory checkpoints: (1) physical integrity verification of the probe tip, cable jacket, and connector against OEM dimensional drawings; (2) coil resistance measurement to confirm the probe winding is within the factory-specified tolerance band; and (3) functional gap-versus-output linearity verification using a calibrated target gap fixture, confirming scale factor accuracy to within ±1% of the nominal −7.87 V/mm specification.

Units are packaged in anti-static foam inserts within moisture-barrier sealed bags, placed in rigid corrugated outer cartons rated for international air freight handling (ISTA 2A test standard). Each shipment includes a certificate of conformance, inspection report, and commercial invoice with HS code classification for customs clearance. Export documentation is prepared in compliance with Chinese customs regulations and destination country import requirements.

Standard dispatch from Xiamen is within 1–3 business days of order confirmation. International express delivery via DHL Express or FedEx International Priority reaches most destinations in Europe, the Middle East, Southeast Asia, and the Americas within 3–5 business days. Sea freight consolidation is available for bulk orders. All shipments include full tracking and are covered by cargo insurance.

A 12-month warranty applies from the dispatch date, covering functional failure under normal operating conditions. Warranty claims are processed with replacement dispatch within 5 business days of confirmed fault verification.

Contact Information

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