Description

Configured for mechanical machinery monitoring in turbine supervisory instrumentation (TSI) platforms, the Bently Nevada 330173-00-06-10-02-00 (330173 Extension Cable) provides direct physical/electrical execution. This hardware component links a 3300 XL 8 mm proximity probe to a 3300 XL Proximitor Sensor, ensuring continuous transmission of high-frequency eddy-current signals. The cable facilitates the accurate measurement of dynamic parameters such as radial vibration, axial thrust, and shaft position without signal degradation across specified distances.

Hardware Specifications

Eddy-Current Probe Scaling and Rotor Dynamics

To maintain the correct scale factor of 7.87 V/mm (200 mV/mil), the system requires precise total electrical length matching between the probe and the extension cable. Consequently, this 4.0-metre extension cable combines with a 1.0-metre probe to achieve the mandatory 5.0-metre system configuration. During commissioning, engineers perform gap voltage validation to verify that the quiescent voltage sits near the -10 VDC target, which represents the midpoint of the linear operating range.

Proper total length matching mitigates calibration errors that alter the rotor dynamics profile data in the 3500 monitoring system. Furthermore, the coaxial construction incorporates optimized shielding configurations that achieve cross-talk suppression between adjacent transducer loops running in the same conduit.

Frequently Asked Questions

Q: Can this 4.0-metre extension cable connect directly to a 0.5-metre proximity probe?

A: No, this cable requires a 1.0-metre probe to achieve the mandatory 5.0-metre total system length. Connecting it to a 0.5-metre probe alters the tuned capacitance, which destroys the linear scale factor and causes severe measurement errors.

Q: What is the mechanical function of the integrated click-loc connectors on this module?

A: The click-loc connectors provide a positive mechanical lock and a reliable electrical connection. This design prevents unintended disconnection due to heavy machine vibration while sealing out environmental contaminants.

Field Installation Guidelines

• Maintain Minimum Bend Radii: Do not bend the unarmored cable tighter than a 25.4 mm (1.0 inch) radius. For the armored variant, observe a minimum bend radius of 31.8 mm (1.25 inches) to prevent mechanical damage to the coaxial core.
• Insulate the Connection: Always insulate the connection point between the probe lead and the extension cable using the standard silicone connector protector kit. This prevents grounding loops caused by accidental contact with the metal conduit or machine casing.
• Observe Thread Engagement: When routing through conduit or junction boxes, ensure that all terminal fittings achieve full mechanical connection. If using NPT threaded entries on environmental enclosures, maintain a minimum of 5 full threads of engagement to preserve the environmental seal.
• Isolate Signal Lines: Route the extension cable away from high-voltage AC power lines and variable frequency drive (VFD) outputs to eliminate electromagnetic interference.