Configured for displacement sensing in constrained machinery envelopes, the Bently Nevada 330705-02-18-10-02-00 (330705-02-18-10-02-00 Reverse Mount Probe) provides direct physical execution of eddy-current signal sensing within rotating machinery protection platforms.

Model Suffix Breakdown

• 330705: 3300 XL NSv Proximity Probe

• 02: Unthreaded length (20 mm)

• 18: Overall case length (180 mm)

• 10: Total length (1.0 m)

• 02: Connector type (Miniature coaxial)

• 00: Agency approval (Not required)

Hardware Specifications

Mechanical Monitoring and TSI Integration

Precise eddy-current probe scaling is required to maintain measurement accuracy, particularly in small-bore applications where the NSv system is utilized. System output must be verified through gap voltage validation, with a nominal -10 VDC target at the calibrated mid-range position. Engineers must implement effective cross-talk suppression by ensuring physical spacing between adjacent probes exceeds minimum specifications, preventing interference in the high-frequency carrier signal. Correct interpretation of rotor dynamics relies on the stability of this probe assembly under thermal and mechanical loading.

Ordering info

• 1 unit 330705-02-18-10-02-00 Reverse Mount Probe

• 1 set mounting hardware

• 1 technical reference guide

Field Installation Guidelines

• Mounting: The reverse mount configuration requires installation from the interior of the machine case or housing. Ensure the jam nut is tightened to specified torque to prevent rotation.

• Grounding: Maintain electrical isolation between the probe housing and the machine case unless the specific monitoring configuration mandates a bonded ground.

• Cabling: Route the coaxial cable through a protected conduit path to avoid mechanical fatigue and prevent induced noise from local electromagnetic fields.

• Gap Calibration: Set the static air gap using a precision tool. Verify that the proximitor output matches the target voltage before initiating machine rotation.

Frequently Asked Questions

• Is the 330705 probe compatible with standard 3300 XL proximitors?

  No, the 330705 NSv probe is designed specifically for use with 3300 XL NSv proximitors to accommodate the smaller tip geometry and frequency response requirements.

• What is the primary advantage of the reverse mount design?

  The reverse mount configuration allows the probe to be installed in locations where access is restricted from the exterior, facilitating mounting within housings.

• Can the probe be used at temperatures above 177 deg C?

  No, exceeding the maximum operating temperature will result in degradation of the internal coil potting and potential signal failure.

• Does the probe require a specific target material?

  The factory calibration assumes AISI 4140 steel. Variations in target alloy will change the sensitivity and require system recalibration.

• How is cross-talk avoided in compact installations?

  Strict adherence to probe-to-probe separation distances is required to prevent beat frequencies caused by the high-frequency oscillator.

• What happens if the cable is cut or damaged?

  The probe and cable are an integrated factory-sealed assembly. Damage to any part of the unit necessitates the replacement of the entire probe assembly.

• Is the connector waterproof?

  The miniature coaxial connector is designed for use in protected, dry environments. It is not intended for direct immersion or exposed exterior installation.

• How should gap voltage be measured?

  Use a high-impedance digital multimeter connected to the proximitor output terminals to confirm the voltage is within the expected range for the set gap.