Configured for contactless displacement monitoring in 3500 Machinery Protection Systems, the Bently Nevada 330101-00-08-20-02-CN (330101 Proximity Probe) provides direct physical/electrical execution. This hardware converts the relative gap between the probe tip and a rotating metallic target into a proportional analog voltage signal. The signal is subsequently processed by an external Proximitor sensor to derive real-time data regarding radial shaft vibration, axial position, and rotor speed for critical rotating assets.

Suffix & Model Matrix

• 330101: 3300 XL 8 mm Proximity Probe (3/8-24 UNF thread)
• -00: Unthreaded Length option (0.0 inches of unthreaded probe sleeve)
• -08: Case Total Length option (0.8 inches total threaded case length)
• -20: Total Length option (2.0 meters system length)
• -02: Connector option (Miniature coaxial Click-Loc connector with fluid protection)
• -CN: Approval option (Regional compliance certification for China)

Hardware Specifications

Rotor Dynamics & Signal Scaling

The 3300 XL system utilizes high-frequency eddy-current probe scaling to ensure accurate measurement of dynamic shaft displacement. Successful field implementation requires precise gap voltage validation, where the static gap is adjusted to hit -10 VDC targets at the center of the probe linear range. This electrical baseline is mandatory for the 3500 monitoring platform to calculate absolute vibration without waveform clipping. Furthermore, practitioners must employ effective cross-talk suppression by ensuring adequate physical spacing between multiple probes mounted on the same bearing plane, preventing interference from overlapping electromagnetic fields.

Ordering Information

• Component Content: One (1) 330101-00-08-20-02-CN proximity probe.
• Included Hardware: Two (2) 3/8-24 UNF hex locknuts for mechanical depth adjustment.
• Connection Kit: One (1) silicone connector protector to maintain signal integrity in oil-mist environments.

Installation & Wiring Guide

• Thread Mounting: Ensure a minimum of five (5) full thread turns are engaged within the mounting bracket to guarantee structural stability.
• Mechanical Clearance: Perform a physical gap check during installation to confirm that rotor expansion will not result in contact between the shaft and the probe tip.
• Grounding Protocol: Terminate the coaxial shield only at the Proximitor sensor housing terminal block to maintain a clean single-point ground.
• Cable Routing: Route the integral coaxial cable through static, vibration-isolated conduits to mitigate mechanical fatigue and cable whip.

Logistics & Delivery

• Delivery time: 2-7 days when payment finish.
• Shipping: Dispatched globally via DHL, FEDEX, or UPS.
• Packaging: Each unit is secured in professional anti-static industrial packaging with shock-absorbing foam to prevent transit damage.

Technical FAQ

• What is the consequence of probe tip contact during operation?

  Physical contact typically causes catastrophic failure of the internal induction coil, resulting in an open circuit that the Proximitor detects as a NOT OK status (near 0 VDC output).

• Can this 2.0 meter probe be used with 5.0 meter extension cables?

  Yes, the 3300 XL system is designed for a fixed total length of either 5.0 or 9.0 meters. The probe and extension cable lengths must sum to one of these two totals for calibration.

• Is it necessary to recalibrate if the target material changes?

  Yes. The 7.87 V/mm scale factor is specific to AISI 4140 steel. Alternative alloys have different magnetic permeability, which alters the probe response and necessitates recalibration.

• Can the coaxial connector be disconnected while the machine is running?

  It is physically possible, but doing so will trigger a channel alarm and potentially a machine trip, as the monitor will lose the displacement signal and default to fault.

• Why is the -CN suffix included in the part number?

  The -CN suffix indicates that the unit adheres to specific regional regulatory certifications for equipment installed in China.

• What is the minimum bend radius for the probe cable?

  To avoid damaging the coaxial structure or altering the impedance, the integral cable should not be bent to a radius smaller than 25.4 mm (1.0 inch).

• How does ambient temperature affect measurement accuracy?

  The probe is temperature-compensated; however, extreme shifts can cause minor thermal drift. System health is maintained by periodic gap checks during machine maintenance cycles.

• How can I verify the probe is functioning correctly?

  Measure the gap voltage at the Proximitor terminal. If the value is between -1 VDC and -21 VDC and changes with shaft displacement, the probe circuit is healthy.