Bently Nevada 330105-02-12-05-02-CN – 3300 XL 8 mm Reverse-Mount Proximity Probe for Reliable Shaft Vibration and Position Monitoring

The Bently Nevada 330105-02-12-05-02-CN is part of the 3300 XL 8 mm reverse-mount probe family that maintenance teams rely on for long-term, stable non-contact measurements on critical rotating assets. From my experience, the reverse-mount body is a simple way to protect the sensing tip and cable in tight or harsh installations—compressors, gearboxes, or older turbine housings where a forward-mount just doesn’t last as well. You might notice that the “-05” option typically denotes a 5 m system length when paired with the matching extension cable and 3300 XL Proximitor sensor, and “-12” usually indicates a 12 ft probe cable length. The “-02” thread format commonly corresponds to 3/8-24 UNF-2A, and the “CN” suffix often means Chinese-language product labeling/support documentation.

Company’s Order Placement Process and Guarantees

• Warranty: 365 days
• Delivery: In-stock items ship in about 1 week; no more than one month at the latest
• Payment: 50% advance; full balance prior to delivery
• Express options: FedEx, UPS, DHL

Key Features

• Reverse-mount 8 mm probe head – Helps protect the sensing tip and cable in confined or abrasive environments.
• True 3300 XL performance – When used with the 3300 XL Proximitor sensor and extension cable, you get the classic 200 mV/mil (7.87 V/mm) sensitivity and stable long-term output.
• System length matching – The “-05” option typically indicates a 5 m system length configuration for proper factory calibration across probe + extension + Proximitor.
• Cable configuration – “-12” commonly denotes a 12 ft integral probe cable to help reach the junction to the extension cable without splices.
• Threading for retrofit – “-02” is commonly 3/8-24 UNF-2A, making it a straightforward drop-in for many North American housings.
• Industrial-grade sealing – Designed for oil-splash, steam, and general plant environments; typically IP68 near the probe tip.
• Compatibility – Works with 3300 XL extension cables and 3300 XL Proximitor sensors in 5 m or 9 m systems (ensure all three components are matched).

Technical Specifications

Brand / Model	Bently Nevada 330105-02-12-05-02-CN (3300 XL 8 mm Reverse-Mount Probe)
HS Code	9031.80 (Measuring or checking instruments, not elsewhere specified)
Probe Type	Non-contact eddy-current proximity probe, reverse-mount body
Tip Diameter	8 mm (0.315 in)
Thread Type (Probe Body)	Typically 3/8-24 UNF-2A for “-02” option
Sensitivity (with 3300 XL system)	7.87 V/mm (200 mV/mil)
Linear Range (typ.)	2.0 mm (80 mils) on standard 5 mm/8 mm systems
Nominal Gap (typ.)	1.0 mm (40 mils) to mid-range
Operating Temperature (Probe)	-51 to +177 °C (-60 to +350 °F), typical for 3300 XL probes
Signal Input/Output Types	Coaxial connection to extension cable; displacement signal provided by 3300 XL Proximitor
Power Requirements	None (passive probe; powered/conditioned by Proximitor)
Communication Interfaces	N/A (analog signal via Proximitor)
Installation Method	Reverse-mount with jam nut; aimed at conductive targets (e.g., AISI 4140 steel)
Dimensions & Weight	8 mm tip; reverse-mount body; integral cable length per “-12” option (probe-only mass is low)
Configuration Notes	“-05” matched for 5 m system length; “-CN” typically indicates Chinese-language labeling

Application Fields

These probes show up most in critical rotating equipment where long-term stability matters. In many cases, teams standardize on 3300 XL for plant-wide vibration and axial position monitoring.

• Steam and gas turbines: shaft vibration and thrust position
• Compressors (centrifugal/recip): bearing vibration, rotor radial position
• Pumps and fans: unbalance/looseness detection and clearance trending
• Gearboxes: mesh-related vibration, shaft runout tracking
• Large motors and generators: sleeve bearing condition monitoring

A maintenance lead at a combined-cycle plant told us their reverse-mount 8 mm probes “survived both hot starts and frequent inspections without losing calibration,” which seemed to be the small reliability edge they were after.

Advantages & Value

• Reliability – 3300 XL probes are known for thermal stability and low drift over time.
• Compatibility – Drop-in with 3300 XL extension cables and Proximitor sensors; easy to standardize spares.
• Lifecycle cost – Reverse-mount design typically reduces cable damage and rework, saving labor during outages.
• Traceability – Clear part coding helps you match the system length correctly, avoiding recalibration headaches.
• Support – We can help confirm thread specs, system length, and accessories before you commit the PO.

Installation & Maintenance

• Mounting – Install from inside the machine case using the jam nut; verify the thread (the “-02” option is typically 3/8-24 UNF).
• Target material – Calibrated for conductive steel (e.g., 4140). If you have non-standard materials or coatings, let us check linearity impacts.
• Gap and alignment – Set the static gap near mid-range (about 1.0 mm/40 mils). Align the probe tip normal to the shaft surface.
• Cable routing – Avoid tight bends and high-temperature zones; keep the coax away from high EMI sources when possible.
• Enclosure & wiring – Place the Proximitor in a ventilated control cabinet; maintain proper grounding/shielding and clean terminal connections.
• Verification – After installation, confirm sensitivity (200 mV/mil) and polarity using a micrometer or calibrated motion fixture.
• Routine care – Periodic inspection of the tip face for debris buildup, check jam-nut tightness, and confirm cabling integrity during outages.

Quality & Certifications

• Typically conforms to CE and RoHS directives for industrial instrumentation
• Manufactured under ISO 9001 quality systems
• Hazardous area approvals may apply depending on full system configuration (probe + extension + Proximitor)
• Manufacturer’s warranty: 12 months (365 days)

Recommended Supporting Components

• 3300 XL Extension Cable – Match the length so the total system equals the “-05” 5 m configuration.
• 3300 XL Proximitor Sensor (5 mm/8 mm system) – Provides the 200 mV/mil output and power to the probe.
• Mounting hardware – Jam nut and protective sleeves as required by the machine casing.

One thing I appreciate is that once the three components are correctly matched, you rarely need field recalibration—swaps during outages go quicker and trending stays consistent.