Bently Nevada 330851-02-000-060-10-00-05 3300 XL 25mm Proximity Probe

Bently Nevada 330851-02-000-060-10-00-05 3300 XL 25 mm Proximity Probe

The Bently Nevada 330851-02-000-060-10-00-05, also cataloged as the 330851 25 mm Eddy Current Probe, operates as a dedicated hardware component for non-contact differential expansion and long-range shaft displacement monitoring within 3500 Machinery Protection Systems.

Suffix Breakdown & Model Matrix

• Base Model: 330851 (3300 XL 25 mm Proximity Probe)
• Probe Case Type Option (-02): 02 = M30x2 Thread
• Unthreaded Length Option (-000): 000 = 0 in
• Overall Case Length Option (-060): 060 = 60 mm
• Total Length Option (-10): 10 = 1.0 meter (3.3 feet)
• Armor Option (-00): 00 = No armor
• Agency Approval Option (-05): 05 = Multiple Agency Approvals (CSA, ATEX, IECEx)

Hardware Specifications

Eddy-Current Probe Scaling and Rotor Dynamics

The 330851-02-000-060-10-00-05 transducer relies on eddy-current probe scaling to measure large axial shaft displacements and rotor dynamics in steam turbine generator sets. When paired with a matching 3300 XL 25 mm Proximitor Sensor, the probe generates a linear scale factor output of 0.787 V/mm (20 mV/mil). Dynamic gap voltage validation (targeting -10 VDC at the physical center of the 12.7 mm linear range) ensures linear voltage tracking across extreme rotor growth cycles. High-density triaxial cable design minimizes signal attenuation and achieves cross-talk suppression between adjacent monitoring channels in heavy industrial turbine casings.

Frequently Asked Questions

Q: What gap voltage reading establishes the baseline linear midpoint for the 3300 XL 25 mm probe?

A: Setting the probe gap distance to approximately 6.35 mm (250 mils) from the target surface produces a baseline DC gap voltage of -10 VDC at the Proximitor Sensor output terminals.

Q: How does the agency approval option (-05) impact field installation in hazardous areas?

A: Option -05 provides certified hazardous area compliance (including ATEX, IECEx, and CSA intrinsic safety ratings), allowing the probe to be deployed in Zone 0/1 or Class I, Div 1 locations when wired through approved safety barriers.

Field Installation Guidelines

• Inspect the machine housing mounting hole to confirm M30x2 thread alignment and clean mechanical clearance prior to probe insertion.
• Thread the probe case into the mounting bracket while measuring DC gap voltage with a multimeter until reaching the target -10 VDC setpoint.
• Torque the M30 locknut against the machine frame to standard mechanical limits to prevent position shift caused by machine vibration.
• Connect the miniature coaxial ClickLoc connector to the extension cable, verifying that the internal detent mechanism clicks firmly.
• Support cable runs with conduit or mounting clips, maintaining a minimum bend radius of 25.4 mm (1.0 in) to protect internal coaxial shielding.