Configured for non-contacting displacement measurement in industrial rotating machinery, the Bently Nevada 330704-000-050-90-02-05 (330704 Proximity Probe) provides direct physical signal execution by sensing the gap between the probe tip and a metallic target.

Model Suffix Definitions

The part number denotes specific mechanical and electrical configurations:

• 330704: 11 mm Proximity Probe, 1/2-20 UNF thread

• 000: Unthreaded length identifier

• 050: Overall case length specification

• 90: Total cable length requirement

• 02: Connector interface configuration

• 05: Agency approval compliance standard

Technical Hardware Specifications

TSI Mechanical Monitoring Characteristics

Effective vibration monitoring requires strict adherence to eddy-current probe scaling protocols. The 330704 probe must be interfaced with a compatible 3300 XL Proximitor Sensor to ensure the system achieves the nominal -10 VDC gap voltage target at the center of the linear range. Maintenance personnel are required to validate rotor dynamics by checking the output signal against known vibration signatures. Furthermore, cross-talk suppression must be maintained by ensuring proper probe spacing if multiple sensors are mounted within the same housing or machine location.

Ordering Information

• 1 x 330704-000-050-90-02-05 11 mm Proximity Probe

• 2 x Mounting nuts (1/2-20 UNF)

• 1 x Connector protector

• 1 x Product technical documentation

Operational Installation Guidelines

• Mechanical Clearance: Ensure a minimum radial clearance of 50 mm from the probe tip to any metallic obstruction.

• Mounting Torque: Tighten mounting nuts to 10.2 N m (90 in-lb) to ensure structural stability without distorting the housing thread.

• Grounding Strategy: Maintain a single-point ground connection at the monitor rack to mitigate the risk of ground loops within the signal circuit.

• Cabling Integrity: Route coaxial cables through rigid conduits and ensure minimum bend radii are observed to prevent impedance changes.

Frequently Asked Questions

• Does this probe require a specific extension cable? Yes, the cable system must be impedance-matched to the 3300 XL Proximitor Sensor.

• Can I repair a damaged probe tip? No, the probe assembly is a sealed, non-repairable unit.

• How is the linear range defined? It is the range over which the output voltage varies linearly with the distance to the target.

• What happens if the gap voltage is outside the -10 VDC target? It may indicate the probe is outside its linear operating range, potentially causing signal distortion.

• Is this probe compatible with 8 mm systems? No, the 11 mm probe requires specific 11 mm probe-compatible components.

• Can I use this probe in liquid environments? Yes, the probe tip and body are designed for use in oil-lubricated machine environments.

• What does the connector protector do? It shields the coaxial connector from moisture, dirt, and electrical noise.

• How do I identify a faulty probe? A constant output voltage at the power supply limit often indicates an open or short circuit.