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

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

The Bently Nevada 330851-02-000-060-10-00-00, 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 (-00): 00 = No Approvals

Hardware Specifications

Eddy-Current Probe Scaling and Rotor Dynamics

The 330851-02-000-060-10-00-00 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: Can the 330851-02-000-060-10-00-00 probe lead be spliced if the cable length is too short?

A: Splicing proximity probe coaxial cables alters calibrated system impedance and capacitance, causing severe scale factor errors. Use matching 3300 XL 25 mm extension cables to extend signal reach.

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.