The Bently Nevada 330101-00-15-20-02-05, also cataloged as the 330101 Proximity Probes, operates as a dedicated hardware component for non-contacting shaft displacement and vibration measurement within Turbine Supervisory Instrumentation (TSI) systems. The instrument establishes a high-frequency radio frequency eddy-current circuit to monitor physical gap changes between the 8 mm probe tip and the target rotor face, providing immediate electrical execution by transferring raw analog proximity data back to a paired Proximitor loop.

Suffix Breakdown & Model Matrix

• 330101: 3300 XL 8 mm Proximity Probe with 3/8-24 UNF thread and integral coaxial armor.

• -00: Unthreaded length option designated as 0.0 inches.

• -15: Overall case length option designated as 1.5 inches.

• -20: Total system length option designated as 2.0 meters (6.6 feet).

• -02: Miniature coaxial ClickLoc connector with connector protector.

• -05: Multiple hazardous area approvals (ATEX, IECEx, CSA certifications).

Hardware Specifications

Eddy-Current Probe Scaling and Gap Voltage Validation

Maintaining measurement accuracy within high-speed rotor dynamics monitoring loops dictates precise calibration matching. Standard eddy-current probe scaling operates at a fixed 7.87 V/mm parameter against an AISI 4140 steel target surface. Field installation requires a strict gap voltage validation routine performed with a digital voltmeter connected to the driver terminals. Technicians must adjust the mechanical depth of the threaded casing until the static output returns a value of -10 VDC targets, identifying the geometric center of the probe tip's calibrated linear measurement range.

Frequently Asked Questions

Q: Does this proximity sensor assembly support live hot-swap replacement when powered?

A: Yes. The passive probe can be unthreaded or disconnected from its matched extension cable while the associated 3500 rack monitor or Proximitor remains powered without causing damage to the driver loop components.

Q: How do metallurgical anomalies on the target shaft surface affect the scale factor?

A: The sensor tuning relies explicitly on the magnetic permeability and conductivity of standard AISI 4140 steel. Alternative alloys shift the eddy-current resistance profile, invalidating the 7.87 V/mm slope and requiring custom recalibration.

Q: Can the 2.0-meter armored cable run be field-spliced or truncated to eliminate slack?

A: No. The physical length and electrical properties of the armored coaxial line provide a calibrated capacitance essential for the RF oscillator circuit. Cutting or altering the cable destroys the impedance matching and tracking linearity.

Field Installation Guidelines

• Radial Clearance Control: Provide a clear cylindrical boundary of at least 30 mm diameter around the 8 mm sensing tip to isolate the active measurement zone from adjacent machine casing structures.

• Locknut Tightening Limits: Secure the 3/8-24 UNF threaded body to the machine bracket with the supplied jam nuts, enforcing a maximum installation torque of 11.2 N-m (100 in-lb) to prevent housing deformation.

• Coaxial Junction Protection: Verify that the ClickLoc terminal connector protector is completely sealed over the extension cable joint to isolate the high-frequency contacts from oil, moisture, and particulate bypass.

• Shield Grounding Implementation: Maintain electrical isolation between the outer armor layer and local machinery ground. The coaxial outer shield layer must carry continuously to terminate at the monitor rack common ground bus bar.

Supply Kit Inventory

The product package contains the following technical line items:

(1) Bently Nevada 330101-00-15-20-02-05 Armored 8 mm Proximity Probe

(2) Two hex jam nuts and one split lockwasher

(3) Removable vinyl thread-engagement cover

(4) Factory-certified calibration report detailing point-by-point linearity tracking

Dispatch and Packaging Provisions

Delivery time: 2-7 days when payment finish via priority international air courier networks including DHL, FEDEX, or UPS. The asset is enclosed inside protective, anti-static industrial packaging configurations to maintain physical shield layer geometry and isolate internal inductive coil terminations from electrostatic damage during transit.