BENTLY 330105-02-12-05-02-05 – 3300 XL 8 mm Proximity Probe for Shaft Vibration and Position

The BENTLY 330105-02-12-05-02-05 is part of the 3300 XL 8 mm proximity sensing system used on critical rotating equipment—turbines, compressors, large motors, and gearboxes. From my experience, this model is typically specified when you need stable, API 670-style shaft vibration and axial position measurements with dependable linearity and long-term thermal stability. It pairs with a 3300 XL Proximitor sensor and a matching extension cable to deliver a clean displacement signal at 200 mV/mil (7.87 mV/μm).

Order Placement Process and Guarantees

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

Key Features

• 3300 XL 8 mm system compatibility: Designed to work with 3300 XL Proximitor sensors and extension cables for full API 670-style monitoring.
• Linear measurement range: Typically up to 2.0 mm (80 mils), giving reliable shaft vibration and position readings around the operating gap.
• Standard scale factor: 200 mV/mil (≈7.87 mV/μm) when paired with the matching 3300 XL components.
• Robust mechanical design: Threaded probe body with locknut for secure mounting in bearing housings and machine casings.
• High temperature resilience: Probe assembly is engineered for elevated machine temperatures seen on steam and gas turbines.
• Low noise, stable output: Eddy-current sensing with excellent repeatability and low drift in most plant environments.
• Drop-in upgrades and replacements: Useful for planned outages or quick swaps to restore a channel with minimal rework.

Technical Specifications

Application Fields

This probe is widely used in API 670-compliant machine protection and condition monitoring. Typical applications include:

• Steam and gas turbines – radial vibration and differential expansion measurements
• Centrifugal compressors – shaft vibration and axial position
• Large motors and generators – sleeve bearing vibration and rotor position
• Pumps and fans – bearing housing monitoring and startup/ shut-down checks
• Gearboxes – gear mesh vibration trending and early fault detection

Advantages & Value

• Proven reliability: The 3300 XL platform is known for stability over temperature and time, which in many cases reduces nuisance trips.
• Compatibility that saves time: Drop-in with 3300 XL Proximitor/extension cables, helping maintenance teams finish outages quicker.
• Consistent linearity: Makes calibration straightforward and trending more trustworthy, especially around the typical 40 mil gap.
• Lower lifecycle cost: Fewer reworks and predictable spares strategy; you might notice fewer callouts for drift.
• Technical support: Documentation and field practices are mature; technicians usually consider these probes “straightforward” to validate.

Installation & Maintenance

• Mounting: Install with the supplied locknut into a properly machined threaded port (3/8-24 UNF). Ensure the probe axis is normal to the rotating surface.
• Gap setting: Set the initial gap around 1.0 mm (40 mils) unless the monitoring standard on-site specifies otherwise.
• Routing: Keep the probe cable away from high-temperature runs and strong EMI fields; secure every 20–30 cm to avoid fretting.
• Cabinet & wiring: Terminate at the 3300 XL Proximitor in a ventilated cabinet; maintain clean, segregated wiring paths to the monitor rack.
• Safety: Lock-out/tag-out rotating equipment. Verify machine is stationary when setting gap and handling probe hardware.
• Routine checks: Inspect tip face cleanliness, verify bias voltage at the Proximitor, and trend the 200 mV/mil scale factor during periodic calibration.
• Firmware/monitor updates: If used with modern monitors, keep firmware current and re-validate scaling after any system change.

Quality & Certifications

• Conforms to typical CE requirements for low-voltage/EMC as part of the full 3300 XL system
• RoHS-compliant materials in most builds
• Manufacturing under ISO 9001 quality systems
• Standard manufacturer’s warranty: 12 months (365 days)

Customer note from a recent retrofit: “We swapped a failing probe with the 330105 variant and were trending again within the shift—no scale surprises, just a quick gap set and go.”