Configured for non-contacting vibration and displacement measurements in Machinery Protection Systems, the Bently Nevada 330702-00-10-10-01-00 (330702 Proximity Probe) provides direct physical/electrical execution. It transforms the dynamic gap between the probe tip and the target material into a proportional electrical signal through eddy-current induction, feeding raw displacement data directly into proximity transducer systems or monitor modules.

Part Number Nomenclature Breakdown

The model structure for the 330702 11 mm proximity probe assembly defines specific mechanical and physical configuration variables as detailed below:

• 330702: Base Model for 3300 XL 11 mm Proximity Probe (Unthreaded, 3/8-24 UNF Thread, or M10 x 1 Thread configurations).

• -00 (Unthreaded Length Option): 0.0 in unthreaded length.

• -10 (Overall Case Length Option): 1.0 in overall case length.

• -10 (Total Length Option): 1.0 meter (3.3 feet) total system cable length.

• -01 (Connector Option): Miniature coaxial ClickLoc connector, supplied with connector protector.

• -00 (Agency Approval Option): No approvals required or standard multi-agency approvals omitted.

Physical and Electrical Specifications

Eddy-Current Scaling & Rotor Dynamics Validation

The 11 mm sensor configuration operates via high-frequency RF field emissions from the probe tip, establishing an eddy-current path within the monitored shaft material. Mechanical engineers and TSI technicians must perform gap voltage validation to ensure the steady-state DC voltage reads approximately -10 VDC at the midpoint of the linear range. This electrical positioning optimizes the system for tracking high-amplitude rotor dynamics without signal clipping.

To eliminate cross-talk suppression failures when deploying multiple 3300 XL sensors in close proximity (such as dual axial or X-Y orthogonal radial configurations), the physical distance between probe tips must maintain a minimum clear separation radius of 40 mm. This spacing prevents electromagnetic interference between the overlapping RF fields of neighboring probes.

Operational and Environmental FAQ

• Q: How does a variation in the target material alloy affect the calibrated scale factor?

• A: The probe is factory-calibrated for AISI 4140 steel. Using alternate target alloys (such as stainless steel or variations in carbon steel) modifies the magnetic permeability and electrical conductivity, altering the 3.94 V/mm scale factor. This requires custom recalibration via the proximity transducer or monitor software.

• Q: Can this proximity probe be hot-swapped while the machinery protection system is live?

• A: Yes. Because the probe is a passive inductive component connected to a current-limited transducer loop, it can be disconnected or replaced without powering down the main 3500 monitoring rack or interrupting other active loops.

• Q: What is the mechanical bend radius limit for the integral coaxial cable?

• A: The minimum allowable bend radius for the standard coaxial cable is 25.4 mm (1.0 in). Bending the cable beyond this threshold can cause permanent changes in internal impedance and deform the shield layer, which disrupts signal transmission accuracy.

Field Installation Guidelines

1. Thread Clearance and Engagement: Mount the probe body into its bracket or housing ensuring zero mechanical binding. For threaded sections, verify full thread engagement without cross-threading. Do not exceed a torque specification of 27 N-m (240 in-lb) for standard housings to avoid crushing or cracking the inner core.

2. Shielding and Grounding Standards: The coaxial cable shield must be isolated from the machine housing and local structural ground. The outer shield should connect to a clean instrumentation ground exclusively at the Proximitor Sensor housing via a dedicated terminal.

3. Physical Protection: Route all extensions and integral cables inside dedicated flexible or rigid metal conduit. Prevent routing parallel to high-voltage AC three-phase power lines to minimize induced electrical noise on the low-voltage DC vibration signal.

4. Terminal and Connector Protection: Utilize the attached ClickLoc connector protector during installation to prevent dirt, water, and oil ingress. Ensure the miniature coaxial connection is dry and clean prior to snapping the connectors together.

Logistics and Kit Procurement Info

• Included inside base package: One (1) 3300 XL 11 mm Proximity Probe with integrated 1.0-meter coaxial cable and factory-installed miniature ClickLoc connector.

• Included accessories: One (1) pre-installed silicone connector protector sleeve.

• Separately ordered system options: Compatible 3300 XL extension cables (available in 4.0-meter and 8.0-meter options) and 3300 XL Proximitor Transducers.

Dispatch and Logistics Details

• Standard Fulfillment Timeline: 2-7 days when payment finish.

• Global Carrier Services: Handled via DHL, FEDEX, or UPS priority transport.

• Packaging Protocols: Shipped inside certified anti-static industrial packaging to neutralize static charge build-up and withstand long-distance shipping environments.