330930-040-01-00 | Bently Nevada | 3300 XL Standard Extension Cable

Configured for signal transmission between proximitor sensors and monitoring systems in the Bently Nevada 3300 XL machine protection platform, the Bently Nevada 330930-040-01-00 (330930-040-01-00) extension cable provides direct physical coupling for vibration monitoring loops.

Suffix Breakdown & Model Matrix

• 330930: 3300 XL Standard Extension Cable base model.
• 040: 4.0 meters (13.1 feet) total length.
• 01: Connector and cable assembly featuring stainless steel armor for mechanical protection and a FEP (Fluorinated Ethylene Propylene) jacket.
• 00: Standard configuration; no additional agency approvals required.

Hardware Specifications

Mechanical Monitoring and Signal Integrity

The 3300 XL extension cable maintains the system calibration sensitivity of 7.87 V/mm (200 mV/mil). Maintaining the integrity of the coaxial shield is imperative to suppress signal cross-talk and electromagnetic interference within the machine protection cabinet. For eddy-current probe scaling, the extension cable resistance is matched to the proximitor sensor impedance. Any compromise in the FEP jacket or mechanical armor affects the characteristic impedance of the coaxial path, which may introduce deviations in gap voltage readings and rotor dynamic signal processing. The connector interface must be verified for clean mating surfaces to ensure the -10 VDC gap voltage target is achieved upon installation.

Frequently Asked Questions

Q: Can the stainless steel armor be grounded to the machine casing?

A: The stainless steel armor is designed for mechanical protection. It should not be utilized as a signal ground. Ensure the cable shield is terminated according to the specific 3300 XL proximitor grounding diagram to avoid ground loops.

Q: Is it permissible to splice this extension cable if the path is too long?

A: Splicing is strictly prohibited. The 3300 XL system is a calibrated loop. Any unauthorized modification of the cable length or impedance alters the system scale factor and voids the measurement accuracy.

Field Installation Guidelines

1. Ensure the probe tip and extension cable connector are free of moisture, oil, and metallic debris before mating.
2. Route the cable through protective conduit to prevent the stainless steel armor from being subjected to constant cyclic vibration or sharp bending radii.
3. Tighten coaxial connectors using manual grip; do not use locking pliers to avoid deformation of the connector coupling.
4. Maintain a minimum bend radius of 25.4 mm for the cable assembly to prevent damage to the internal coaxial dielectric.
5. Secure the cable using non-conductive cable ties to prevent contact with live high-voltage AC lines within the field junction box.