Technical Summary

The Bently Nevada 106765-04 is a 4-meter interconnect cable engineered for transmitting dynamic eddy current sensor signals within the 3300 Proximity Transducer System. It establishes a dedicated electrical pathway linking the Proximitor Sensor to the 3300 rack monitor. The hardware minimizes signal attenuation and impedance mismatch, preventing RF reflections and phase shifts across the 24.3 mV/um or 7.87 V/mm scale factor. This shielding architecture blocks electromagnetic interference (EMI) to isolate critical vibration frequencies, eliminating reading drift and preventing false machine trips during high-frequency rotor dynamics tracking.

Suffix Breakdown

• 106765 - Base model identifier for high-performance coaxial interconnect cables optimized for Bently Nevada proximity systems.
• -04 - Defines the specific physical length configuration representing 4.0 meters (13.1 feet) of overall cable length.

Technical Specifications

Engineering FAQs

Q: Can the 106765-04 cable be modified or spliced in the field if the length is excessive?

A: Splicing or cutting this coaxial cable alters the total system capacitance and electrical length, which destroys the calibrated 7.87 V/mm (200 mV/mil) scale factor. Excess length must be looped and secured, not removed.

Q: Is the 106765-04 directly compatible with the newer 3300 XL series Proximitor sensors?

A: It interfaces physically with 3300 XL hardware, but using the non-XL 106765 cable with an XL Proximitor limits system performance to legacy 3300 standards and may introduce minor linearity discrepancies. Use 3300 XL series extensions for full XL specs.

Q: What occurs if the coaxial connectors encounter moisture or oil contamination inside a conduit?

A: Liquid ingress causes cross-talk or insulation breakdown, shifting the gap voltage reading toward zero VDC and generating false probe fault alerts. Seal connections with silicone tape or fluid-tight terminal boxes.

Field Guidelines

• Mechanical Installation: Maintain a minimum bend radius of 25.4 mm during installation. Avoid sharp bends or kinks that displace the internal dielectric layer and degrade signal propagation.
• Shield Grounding Circuitry: Terminate the outer shield braid strictly at the monitor rack chassis ground. Leave the field sensor end floating inside an isolated terminal block to prevent ground loops that superimpose 50/60 Hz noise onto the vibration signal.
• Connector Torque: Hand-tighten the coaxial connectors until the internal lock clicks. Apply a single drop of non-conductive thread-locking compound if operating under extreme structural vibration profiles; do not use pliers.
• Gap Voltage Verification: Post-installation, verify the static gap voltage measures between -9.0 VDC and -11.0 VDC (nominal target -10.0 VDC) using a digital multimeter at the terminal block to confirm correct electrical length match.