BENTLY 330854-040-25-CN – Proximity Probe Assembly for 3300 XL Machinery Protection

The BENTLY 330854-040-25-CN is a proximity probe assembly used in Bently Nevada 3300 XL systems for non-contact shaft vibration and position measurements. From my experience, this model is typically selected as part of an eddy-current probe chain (probe + extension cable + Proximitor sensor) on critical rotating assets—turbines, compressors, pumps, and generators—where steady, repeatable measurements matter more than anything flashy. The “CN” suffix usually indicates the China-market variant, while the middle code suggests a defined cable length and configuration that many OEMs standardize on.

Our Order Placement Process and Guarantees

• Warranty: 365 days
• Delivery: 1 week for 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

• Non-contact eddy-current sensing – Designed for continuous shaft vibration and axial position monitoring without mechanical wear.
• 3300 XL ecosystem compatibility – Pairs with the matching Bently Nevada Proximitor sensor and extension cable for calibrated chain performance.
• Stable sensitivity – In many cases, used with 200 mV/mil (7.87 mV/µm) Proximitor output, which most plants are already tuned for.
• Rugged industrial build – Probe and cable construction built for harsh machine spaces; typically resists oil splash, vibration, and moderate heat.
• Drop-in service replacement – You might notice that it suits maintenance turnarounds where form-fit-function alignment matters more than redesigns.

Technical Specifications

Note: Configuration codes (e.g., “040-25”) define cable length and options. If you share your exact chain (probe + extension + Proximitor), we’ll verify compatibility before shipping.

Application Fields

• Steam and gas turbines – radial vibration, axial position (thrust), and differential expansion points.
• Compressors and expanders – continuous vibration protection in API 670 environments.
• Pumps and fans – bearing and shaft monitoring for predictive maintenance programs.
• Gearboxes and paper/steel lines – slow-roll position tracking and relative shaft movement.

Advantages & Value

• Reliability – These probes are built for machine rooms: oil, vibration, and temperature swings. In many cases, this is a set-and-forget component.
• Compatibility – Works within the 3300 XL measurement chain, reducing integration time and tuning effort.
• Lifecycle savings – Stable calibration helps avoid nuisance trips and unnecessary outages.
• Technical backing – We double-check part codes against your monitor cards and proximitor models to prevent mismatches on site.

Installation & Maintenance

• Mounting – Use the specified probe thread and locknut; ensure a rigid bracket and clean target surface (usually ferromagnetic steel).
• Wiring – Route the probe cable away from high-voltage lines; avoid tight bends and sharp edges; maintain shielding continuity to the Proximitor.
• Cabinet & ventilation – Place Proximitors in a clean, ventilated panel; follow grounding best practices to minimize electrical noise.
• Gap setting – Set the static gap using feeler gauges or the DC bias voltage method recommended for 3300 XL systems.
• Routine checks – Inspect connectors and cable armor periodically, clean probe tips during shutdowns, and keep firmware on the monitoring rack up to date.

A maintenance lead at a combined-cycle plant told us they typically re-verify gap and bias during major overhauls; this quick step often catches bracket shift or cable strain early.

Quality & Certifications

• CE compliant; RoHS alignment for materials in most configurations
• Manufactured under ISO 9001 quality systems (typical for Bently Nevada production)
• Warranty: 365 days (our supply warranty). Manufacturer’s standard policy applies thereafter.

Supporting Components (for a complete chain)

• 3300 XL Proximitor sensor (matched sensitivity, e.g., 200 mV/mil)
• 3300 XL extension cable (length to suit your installation drawing)
• Mounting hardware and brackets (as per machine drawing and thread spec)

If you can share the monitor model, proximitor part number, and required cable lengths, we’ll validate that BENTLY 330854-040-25-CN matches your plant standards and ship the configuration you expect. It seems to be a straightforward fit in most 3300 XL applications, but we still like to confirm the chain to avoid any surprises during commissioning.