Bently Nevada 330130-085-02-05 3300 XL Standard Extension Cable

Configured for signal transmission between proximity probes and monitoring instrumentation in machinery protection systems, the Bently Nevada 330130-085-02-05 (3300 XL Extension Cable) provides direct physical and electrical execution within the transducer chain.

Hardware Specifications

Eddy-Current Probe Scaling and Rotor Dynamics

The 3300 XL transducer system requires strict impedance matching to maintain the integrity of eddy-current probe scaling. This extension cable is designed to provide a consistent electrical path that supports the carrier frequency of the Proximitor sensor. During commissioning, gap voltage validation against -10 VDC targets must be performed at the monitor terminal to ensure the transducer operates within its linear range. Effective cross-talk suppression is achieved by keeping the cable run isolated from other high-frequency sources, which prevents signal noise from affecting displacement or vibration measurements critical for rotor dynamics analysis.

Frequently Asked Questions

Q: Can this 8.5 metre cable be used with probe lengths not originally specified in the system design?

A: No. The transducer system (probe, extension cable, and Proximitor sensor) is calibrated as a matched set. Altering the total length of the cable chain changes the system capacitance and impedance, which degrades measurement accuracy and violates calibration requirements.

Q: How should the included connector protectors be used during installation?

A: The connector protectors must be installed to prevent moisture, oil, or debris ingress into the coaxial connection points. Contamination at these junctions causes signal drift and impedance shifts, leading to unstable gap voltage readings.

Field Installation Guidelines

• Routing: Route the extension cable in dedicated instrument conduits or trays. Maintain minimum bend radii of 25 mm to prevent mechanical stress on the coaxial dielectric and center conductor.
• Connections: Connections must be hand-tightened until full metal-to-metal contact is achieved. Avoid the use of pliers, as excessive force can deform connector threads or damage the gold-plated pins.
• Grounding: Maintain shield continuity across the entire length of the cable. The system must be grounded only at the monitor end to avoid ground loops that inject low-frequency noise into the monitoring signals.
• Verification: Verify that the cable length complies with the system-specific maximum allowed distance to ensure signal strength remains within the operational margin for the chosen proximity probe.