21747-080-00 | Bently Nevada 8m Extension Cable

Introduction to the Bently Nevada 21747-080-00 Extension Cable

When your rotating machinery demands precise vibration monitoring, the 21747-080-00 from Bently Nevada provides the critical link between probe and Proximitor. This extension cable is engineered to maintain signal integrity over its 8.00 metres (315 inches) length, ensuring that your data remains accurate and dependable.

Part of the Bently Nevada 21747 series, this cable is designed for seamless integration with compatible probes and Proximitors. Whether you are upgrading an existing system or building a new one, the 21747-080-00 offers a straightforward solution for extending your sensing reach.

Key Features and Technical Specifications

• Model: 21747-080-00 – Extension Cable
• Manufacturer: Bently Nevada
• Cable Length: 8.00 metres (315 inches)
• Armor Option: 00 – Without armor
• Power Consumption: -17.5 Vdc to -26 Vdc at 12 mA maximum
• Calibrated Range: 80 mils (2.0 mm), beginning at approximately 10 mils (0.25 mm) from probe face
• Scale Factor: 200 mV/mil (7.87 V/mm), ±4% (system calibrated) or ±9.5% (including interchangeability)
• Linearity: Within 0.8 mils (0.02 mm) of a 200 mV/mil straight line (system calibrated); within 2.3 mils (0.06 mm) including interchangeability
• Frequency Response: 0 to 10 kHz (0 to 600,000 cpm); -5% at 10 kHz
• Temperature Sensitivity: Typically -3% change in scale factor at +150°F (+65°C) at 50 mils gap (1.27 mm)
• Operating Temperature: Proximitor: -60°F to +212°F (-51°C to +100°C); Probe and Extension Cable: -30°F to +350°F (-34°C to +177°C)
• Relative Humidity: Up to 95%, noncondensing

One distinctive feature is the cable's ability to maintain a consistent scale factor across its length, which is crucial for accurate vibration measurement. The 200 mV/mil output ensures that even small displacement changes are captured with high fidelity.

Applications and Use Cases

The 21747-080-00 is ideal for turbomachinery monitoring, including steam turbines, gas turbines, and compressors. In these environments, reliable vibration data is essential for predictive maintenance and avoiding unplanned downtime.

Furthermore, this extension cable suits applications where the Proximitor must be mounted remotely from the probe, such as in hazardous or hard-to-reach areas. Its robust design supports continuous operation in demanding industrial settings.

Installation and Setup Guide

When installing the 21747-080-00, ensure that the cable is routed away from high-voltage lines and sharp edges to prevent damage. The cable's length of 8.00 metres provides flexibility in positioning the Proximitor, but be mindful of the total system length requirement (five or nine metres from probe tip to Proximitor) for optimal performance.

For added protection, stainless steel armor is available (armor option not included in this model). If physical abuse is a concern, consider selecting an armored version for improved resistance.

Maintenance and Reliability

Regular inspection of the cable and its connections is recommended to ensure long-term reliability. Check for signs of wear, cuts, or corrosion, especially in harsh environments. The cable's operating temperature range of -30°F to +350°F allows for use in extreme conditions, but periodic checks help maintain signal integrity.

Because the cable is part of a system, it is important to verify that the probe and Proximitor are compatible and that the total system length is correct. This ensures that the calibrated range and scale factor remain within specification.

Compatibility and Integration

The 21747-080-00 is designed to work with Bently Nevada probes and Proximitors that have the same part number and length. Probes and cables of the same length are completely interchangeable, simplifying replacement and maintenance.

This cable supports a frequency response of 0 to 10 kHz, making it suitable for a wide range of rotating machinery speeds. It integrates seamlessly with Bently Nevada monitoring systems, providing reliable data for condition monitoring and protection.

Frequently Asked Questions

Q: What is the length of the 21747-080-00 extension cable?

A: The cable length is 8.00 metres (315 inches).

Q: Does this cable come with armor?

A: No, the armor option is 00, meaning without armor. Armored versions are available separately.

Q: What is the calibrated range of the system with this cable?

A: The calibrated range is 80 mils (2.0 mm), beginning at approximately 10 mils (0.25 mm) from the probe face.

Q: What is the operating temperature range for the extension cable?

A: The cable operates from -30°F to +350°F (-34°C to +177°C).

Q: Is this cable interchangeable with other Bently Nevada cables?

A: Yes, probes and cables of the same length are completely interchangeable.

Product Support and Availability

The Bently Nevada 21747-080-00 is available through Petro Auto Tech. For ordering assistance or technical questions, contact our team. We ensure fast delivery and reliable support for your industrial automation needs.