Bently Nevada 330425-01-05 – Proximitor Sensor Module for 3300 XL Proximity Measurements

The Bently Nevada 330425-01-05 is a Proximitor-style sensor module used in 3300 XL proximity transducer systems to convert eddy-current probe signals into precise DC gap and dynamic vibration outputs. From my experience, this module is commonly paired with 8 mm proximity probes on critical rotating machinery—compressors, turbines, large pumps—where tight linearity and stable temperature performance really matter. You might notice that, in most cases, the output scaling follows the familiar 200 mV/mil (≈7.87 mV/µm) convention, making it straightforward to integrate with 3500-series monitors and many legacy setups.

Our Order Process and Guarantees

• Warranty: 365 days
• Delivery: 1 week if in stock; no more than 1 month latest
• Payment: 50% advance payment; full payment before delivery
• Express options: FedEx, UPS, DHL

Key Features

• Proven proximity conversion – Typically delivers 200 mV/mil (≈7.87 mV/µm) scale factor for shaft position and vibration.
• Stable over temperature – Designed for industrial environments with low drift for reliable long-term trending.
• Gap and dynamic outputs – DC gap voltage plus buffered dynamic vibration for diagnostics and balancing.
• −24 Vdc powered – Draws power directly from the monitoring system; wiring is straightforward in most racks.
• 3300 XL ecosystem – Typically used with 8 mm probes and extension cables for 5 m to 9 m system lengths.
• Noise immunity – Shielded, robust signal path helps in high-EMI panels and near VFDs.
• Easy retrofit – Drop-in philosophy minimizes re-configuration on 3500 monitors when replacing like-for-like.

Technical Specifications

Application Fields

This model is widely used for shaft vibration, axial position, and radial clearance monitoring on:

• Steam and gas turbines, including generator trains
• Centrifugal and screw compressors with API 670 compliance expectations
• Large pumps and fans where vibration baselines must be trended
• Gearboxes and expanders requiring tight runout detection

A maintenance lead from a refinery told us the swap to 330425-01-05 “cut our troubleshooting time in half” because the DC and dynamic outputs matched their 3500/40M settings without rework.

Advantages & Value

• Compatibility – Works seamlessly with 3300 XL probes and 3500 racks, reducing engineering hours.
• Reliability – Stable drift characteristics support long monitoring intervals and fewer false alarms.
• Cost of ownership – Standardized parts simplify spares strategy and training.
• Support – From my experience, setup help and replacement guidance keep outages short and predictable.

Installation & Maintenance

• Cabinet & mounting – Install in a clean, dry control cabinet with adequate ventilation. Use the designated mounting holes; keep high-voltage lines segregated.
• Wiring – Maintain shield continuity from probe to monitor. Ground at one end only to avoid loops; route away from VFD cables.
• Probe system length – Match probe, extension cable, and Proximitor to the same total length (e.g., 5 m system). Mixed lengths lead to scaling errors.
• Verification – Periodically check gap voltage with a micrometer target and confirm scale factor (200 mV/mil typical). Record baseline spectra.
• Routine care – Inspect connectors for corrosion, ensure tight terminations, and keep the module free of dust. Firmware updates are not applicable; monitor configuration should be backed up.
• Safety – De-energize the monitoring channel before changing wiring; follow site lockout/tagout standards.

Supporting Components (Typical Pairings)

• Proximity Probes: 3300 XL 8 mm (e.g., 330103 / 330104 series) for standard machinery targets.
• Extension Cables: 330130 series to complete 5 m, 7 m, or 9 m system lengths.
• Monitoring: 3500/40M (Proximitor I/O) and 3500/22M (Transducer Interface) modules for rack-based protection.
• Accessories: Probe mounting brackets, target adapters, and junction hardware for clean routing.

Quality & Certifications

• Manufacturer certifications typically include CE marking; production under ISO 9001 quality systems
• RoHS compliance is standard for most recent Bently Nevada sensor families
• Warranty: 365 days (exchange/repair policy available subject to evaluation)