330904-04-14-05-02-00 3300 XL NSv Proximity Probe | Bently Nevada

Configured for precision displacement measurement in restricted machine geometries, the Bently Nevada 330904-04-14-05-02-00 (330904 Proximity Probe) provides direct physical signal transduction via eddy-current interaction.

Suffix Breakdown & Model Matrix

• 330904: Base Model (3300 NSv Proximity Probe, M8x1 Thread, Armored)
• -04: Unthreaded Probe Length (40 mm)
• -14: Total Case Length (140 mm)
• -05: Integral Cable Length (0.5 meter)
• -02: Connector Type (Miniature coaxial ClickLoc, standard cable)
• -00: Agency Approval (Standard)

Hardware Specifications

Mechanical Monitoring & TSI Characteristics

The 3300 NSv system utilizes eddy-current probe scaling to convert target distance into a linear voltage output. To maintain accurate rotor dynamics data, operators must perform a gap voltage validation during installation, targeting a -10 VDC output at the nominal gap setting. The probe tip and associated cabling form an oscillating circuit with the Proximitor sensor; maintaining the 75 ohm characteristic impedance is necessary for signal integrity. Cross-talk suppression should be managed by ensuring the coaxial shield is properly bonded at the monitor interface, preventing induced noise from affecting the vibration orbit or runout data.

Frequently Asked Questions

Q: What is the maximum torque for probe installation?

A: The M8x1 threaded body must be installed with a maximum torque of 0.56 N m (5 in lb). Excessive torque can distort the probe housing or damage the internal coil assembly, leading to non-linear signal response.

Q: How does the armored cable construction impact installation?

A: The stainless steel armor provides protection against physical abrasion and environmental hazards. However, installers must adhere to the minimum cable bend radius of 25.4 mm (1.0 inch) to prevent kinking the armored jacket and deforming the underlying 75 ohm coaxial geometry.

Field Installation Guidelines

• Gap Voltage Validation: Use a high-impedance digital multimeter to measure the gap voltage. Adjust the probe position until the reading is -10 VDC at the specified nominal center-gap to ensure the system is operating within its linear measurement range.
• Shielding and Grounding: Ensure the coaxial cable shield is continuous back to the monitor or proximitor housing. Avoid pinching or crushing the cable during routing, as deformation alters the characteristic impedance and calibration accuracy.
• Cable Routing: Keep coaxial cables away from high-voltage AC lines to prevent induced interference. Use proper cable clamps to secure the armored cable and prevent mechanical resonance.
• Connection Integrity: Ensure the ClickLoc connector is fully seated. Contaminants within the connector interface will increase contact resistance and introduce noise into the transducer signal chain.