Configured for displacement and vibration measurements in machinery protection systems, the Bently Nevada 330703-000-070-10-02-00 (330703 Proximity Probe) provides direct physical/electrical execution. The instrument converts physical separation data from a rotating conductive target surface into an electrical property processed by an intermediate 3300 XL Proximitor Sensor. This configuration allows non-contact verification of static parameters such as axial thrust and dynamic parameters including fluid-film bearing radial vibration.

Nomenclature Analysis

• 330703: 3300 XL 11 mm Probe, 3/8-24 UNF thread, without armor.

• 000: Unthreaded length option (0.0 in).

• 070: Overall case length option (7.0 in).

• 10: Total length option (1.0 m / 3.3 ft).

• 02: Connector and cable option (Miniature coaxial ClickLoc connector with connector protector).

• 00: Agency approval option (No approvals required).

Mechanical and Electrical Data

Eddy-Current Probe Scaling and Rotor Dynamics Calibration

The 11 mm probe relies on precise eddy-current probe scaling to ensure linear tracking across standard AISI 4140 steel targets. Field alignment requires formal gap voltage validation (-10 VDC targets) at the Proximitor output terminal to orient the probe tip within the center of its 160 mil calibration envelope. This precise physical position enables appropriate resolution for tracking dynamic rotor dynamics under high velocity or varying thermal conditions. To safeguard processing performance, cross-talk suppression is maintained by respecting the minimum structural separation guidelines between nearby sensors measuring orthogonal vibration coordinates.

Shipping Inventory

• 1 330703-000-070-10-02-00 Proximity Probe with 1.0 m integrated coaxial lead wire

• 2 3/8-24 UNF Hexagonal Locking Nuts

• 1 Pre-installed ClickLoc Coaxial Connector Protector Sleeve

• 1 Product Field Reference Document

Field Installation Guidelines

• Mechanical Thread Engagement and Torque Specifications

• Guide the probe housing into the 3/8-24 UNF receiving bore, guaranteeing at least 5 full threads of engagement for robust mounting stability.

• Adjust the probe to target distance using electrical multimeter tracking, then lock the jam nuts to a terminal torque limit of 10.7 N-m (95 in-lb).

• Coaxial Wire Path and Shielding Rules

• Lay out the flexible coaxial line while maintaining a minimum bend radius of 25.4 mm (1.0 in) to prevent internal transmission failures.

• Isolation of the sensor wire must be maintained inside grounded metal conduit lines to bypass induced electrical noise from high-voltage cables.

Frequently Asked Questions

• What baseline gap voltage is demanded during field commissioning?

  The hardware must be mechanically adjusted to register a baseline value of -10 VDC targets from the Proximitor loop, which matches the true linear center of the sensor tip.

• Can this specific proximity probe operate without an external Proximitor?

  No, this component is a passive induction element and must be integrated with a 3300 XL Proximitor Sensor to convert the signal into a linear output voltage.

• Does this model configuration include built-in flexible stainless steel conduit armor?

  No, the 330703-000-070-10-02-00 variant indicates a standard coaxial cable wire configuration without the optional external stainless steel protective armor sheath.

• Will altering the length of the integrated cable modify measurement accuracy?

  Yes, cutting or extending the integral lead wire modifies the impedance tuning properties of the sensor loop, which degrades the output scale factor accuracy.

• What standard metallic target alloy is used to factory-calibrate the 11mm tip?

  The primary scale factor tracking is calibrated against AISI 4140 steel targets; using other target materials requires specific recalibration procedures.

• Is it acceptable to perform hot-swap actions at the ClickLoc coaxial connector interface?

  Yes, the connection to the Proximitor can be detached or attached while powered without risk of hardware failure, though it will trigger a channel alarm.

• How do field technicians insulate the coaxial interface from moisture?

  Slide the pre-installed connector protector sleeve securely over the mated ClickLoc joint or seal it completely using self-fusing high-temperature silicone tape.

• What physical degradation occurs if the jam nuts are over-torqued?

  Exceeding the 10.7 N-m torque specification risks fracturing the internal ceramic-plastic tip interface, ending the operational lifespan of the transducer.