Configured for contactless displacement monitoring in 3500 Machinery Protection Systems, the Bently Nevada 330101-00-20-10-01-00 (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 processed by an external Proximitor sensor to derive real-time data regarding radial shaft vibration, axial position, and rotor speed for critical rotating machinery.

Suffix Breakdown & 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)

• -20: Case Total Length option (2.0 inches total threaded case length)

• -10: Total Length option (1.0 meter system length)

• -01: Connector option (Miniature coaxial connector, standard)

• -00: Agency Approval option (Not required/Standard version)

Hardware Specifications

Rotor Dynamics & Eddy-Current Precision

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 Info

• One (1) 330101-00-20-10-01-00 Proximity Probe

• Two (2) 3/8-24 UNF-2A hex locknuts

• One (1) silicone connector protector sleeve

• Manufacturer compliance and calibration documentation

Field Installation Guidelines

• Mounting Engagement: Ensure a minimum of five (5) full thread turns are engaged within the mounting bracket to guarantee structural stability.

• Clearance Verification: Perform a physical gap check during installation to confirm that rotor thermal expansion or transient deflection will not result in contact between the shaft and the probe tip.

• Grounding: Terminate the coaxial shield only at the Proximitor sensor housing terminal block to maintain a clean single-point ground and prevent ground-loop current noise.

• Cable Protection: Route the integral coaxial cable through static, vibration-isolated conduits to mitigate mechanical fatigue and cable whip.

Dispatch Information

• Delivery time: 2-7 days when payment finish.

• Shipped via DHL/FEDEX/UPS.

• Securely packed in anti-static industrial packaging.

Frequently Asked Questions

• 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 1.0 meter probe be used with standard extension cables?

  Yes, but the total system length (probe + extension cable) must be 5.0 meters or 9.0 meters to maintain factory-calibrated impedance and sensitivity.

• 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?

  Disconnecting the probe cable triggers a channel alarm and potentially a machine trip, as the monitor will lose the displacement signal and default to a fault condition.

• 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.

• Does the probe support hot-swapping?

  The probe is a passive component. It can be physically removed or replaced without affecting the Proximitor module power, though it will cause a signal loss fault during the process.