Configured for non-contacting vibration and displacement measurements in turbomachinery asset optimization, the Bently Nevada 330901-00-08-10-02-00 (330901 Proximity Probe) provides direct physical execution of eddy-current sensing loops. This transducer system functions specifically with small-bore targets or where restricted mounting clearances prohibit standard 5 mm or 8 mm probe profiles. The hardware translates mechanical shaft position variations into proportional electrical voltage signals within the continuous machine monitoring loop.

Part Number Configuration Details

The alphanumeric options designated in the part number dictate the physical dimensions, thread types, and structural options for the probe housing:

• 330901: Base model number for the 3300 NSv Proximity Probe, 3/8-24 UNF thread, smooth unthreaded portion option.

• 00: Unthreaded Length option. Standard 0.0 inches.

• 08: Overall Case Length option. Rated at 0.8 inches.

• 10: Total Length option. Specifies 1.0 meter (3.3 feet) of integral coaxial cable.

• 02: Connector Option. Miniature coaxial ClickLoc connector with connector protector.

• 00: Agency Approval Option. No hazardous area approvals requested.

Physical and Electrical Specifications

Eddy-Current Scaling and Gap Validation

The 3300 NSv probe functions via eddy-current probe scaling tuned to standard AISI 4140 AISI steel targets. Due to the reduced tip size, cross-talk suppression is critical; physical spacing between adjacent 3300 NSv probe tips must be maintained at a minimum of 25 mm to prevent mutual electromagnetic interference. Field calibration requires gap voltage validation utilizing a nominal -10 VDC target midpoint, corresponding to the center of the linear calibration slope. This sensor design captures high-frequency rotor dynamics without physical contact, transmitting instantaneous shaft position data back to the TSI rack.

Package Contents

• 1 Bently Nevada 330901-00-08-10-02-00 Proximity Probe with integral 1.0 meter cable.

• 1 Miniature coaxial male connector protector sheath.

• 1 Technical installation instruction sheet.

Field Mechanical Constraints

Mechanical Thread Installation

• Verify thread matching to 3/8-24 UNF tapped holes before insertion to prevent cross-threading.

• Maintain a minimum mechanical engagement of 5 full threads within the machine housing block.

• Exert a maximum torque value of 3.4 N-m (30 in-lb) when locking the probe positioning nut.

Cable Routing Restrictions

• Observe the minimum bend radius constraint of 25.4 mm (1.0 inch) for the coaxial extension cable lines.

• Isolate transducer cables from adjacent high-voltage AC lines to prevent induced signal distortions.

• Ensure the coaxial connection junction point remains dry, isolated, and housed within an approved terminal enclosure.

Technical Performance FAQ

• Can this specific probe be deployed without an external Proximitor Sensor module?

  No. This probe is a passive inductive device that requires a 3300 NSv Proximitor Sensor to supply the high-frequency RF signal and demodulate the displacement voltage.

• What is the consequence of exceeding the stated 3.4 N-m torque specification during mounting?

  Excessive torque deforms the internal mechanical core assembly of the probe tip, causing permanent calibration shifts or catastrophic internal winding failure.

• How does a change in the target material from 4140 steel affect the scale factor?

  Alternative metals alter the magnetic permeability and electrical conductivity, shifting the factory 7.87 V/mm scale factor and compromising measurement accuracy.

• What occurs if the probe cable is routed parallel to three-phase motor supply leads?

  Electromagnetic induction creates high-amplitude noise on the -10 VDC nominal gap voltage, triggering false high-vibration alarms within the monitor rack.

• Does this model support hot-swapping or disconnects while the monitoring system is live?

  Yes. The passive transducer probe can be disconnected from the extension cable without powering down the main 3500 series monitor rack.

• What physical indicator verifies that cross-talk suppression has failed?

  A low-frequency beat frequency or erratic voltage oscillations appear on the bias output signal when two probe tips are spaced closer than 25 mm.

• Why is the nominal gap voltage target set specifically around -10 VDC?

  The -10 VDC point represents the linear midpoint of the eddy-current voltage curve, ensuring equal headroom for positive and negative dynamic shaft excursions.

• Is the integral cable jacket resilient against direct exposure to synthetic lubricating oils?

  Yes. The fluoropolymer coaxial cable insulation resists degradation from typical industrial turbine oils, synthetic lubricants, and moisture.