Bently Nevada 21747-075-00 Extension Cable for Proximity Probes

Technical Specifications Breakdown

Key parameters for the 21747-075-00 are listed below for quick reference:

System Length and Interchangeability

The combination of probe with integral lead and extension cable is designed to achieve a system length of either five or nine metres from probe tip to Proximitor. Probes are available with integral leads of various lengths to match the average extension cable lengths. Probes and cables of the same length, and Proximitors with the same part number, are completely interchangeable. For added protection, stainless steel armor is available, providing improved resistance to physical abuse.

Industry Applications

Turbine Vibration Monitoring

In steam and gas turbines, the 21747-075-00 extension cable connects non-contact eddy current probes to Proximitors, enabling continuous monitoring of shaft vibration and position. The cable's 7.5-metre length suits installations where the probe is mounted near the bearing housing and the Proximitor is located in a junction box or cabinet.

Compressor and Pump Protection

For critical compressors and pumps, this extension cable ensures reliable signal transmission even in environments with oil mist, moisture, or moderate temperatures.

Generator Clearance Monitoring

In large generators, accurate clearance measurements between rotor and stator are essential. The 21747-075-00 cable supports precise gap measurements, helping prevent costly rubs and failures.

Installation and Setup Guidance

When installing the 21747-075-00 extension cable, follow these best practices:

• Ensure the cable is routed away from high-voltage power cables to avoid electromagnetic interference.
• Use appropriate cable glands or connectors to maintain environmental sealing.
• Verify that the total system length (probe integral lead + extension cable) matches the Proximitor's specified length (5 or 9 metres).
• For without-armor cables, provide additional mechanical protection if the cable passes through areas with potential abrasion or impact.
• Do not exceed the cable's minimum bend radius during installation.

Maintenance and Reliability

Regular inspection of the extension cable and its connections is recommended. Look for signs of wear, corrosion, or damage to the jacket. In environments with high humidity or chemical exposure, consider using the armored version (option 01) for enhanced durability. The cable itself requires no periodic calibration, but the overall monitoring system should be verified per manufacturer guidelines.

Compatibility and Integration

This extension cable is designed for use with Bently Nevada 3300 and 3500 series proximity probes and Proximitors. It is fully interchangeable with other cables of the same length and part number, allowing easy replacement in the field. The system's interchangeability ensures minimal downtime during maintenance.

Selection Guide and Purchasing Advice

When selecting an extension cable, consider the required system length and environmental conditions. The 21747-075-00 is a 7.5-metre cable without armor, suitable for many standard industrial applications. For installations requiring extra physical protection, choose the armored version (part number 21747-075-01). AutoDCSTech offers this cable new and original in factory packing, backed by a 12-month warranty. Please verify current lifecycle status and availability with AutoDCSTech before ordering.