Bently Nevada 21747-040-01 Extension Cable 4m Armored

21747-040-01 Bently Nevada Extension Cable

Product Introduction

The Bently Nevada 21747-040-01 is a high-performance extension cable specifically designed for the 3300 XL series proximity measurement systems. This model offers a 4-meter (157 inches) length, providing flexibility for various mounting distances. Furthermore, it includes the armor option (01), which adds a layer of rugged stainless steel protection. This feature makes the cable exceptionally durable against physical abuse in demanding turbine and compressor applications. Consequently, this cable maintains signal integrity between the probe tip and the Proximitor, ensuring accurate vibration monitoring. As a result, it is a critical component for predictive maintenance and machine protection strategies.

Technical Specifications

Electrical and Output Parameters

The 21747-040-01 operates with an input power range of -17.5 Vdc to -26 Vdc, with a maximum consumption of 12 mA. Its calibrated range spans 80 mils (2.0 mm), beginning at approximately 10 mils (0.25 mm) from the probe face. The system provides a scale factor of 200 mV/mil (7.87 V/mm) with a ±4% accuracy when calibrated as a complete system. Moreover, when including interchangeability errors, the accuracy remains within ±9.5%. For linearity, the system performs within 0.8 mils (0.02 mm) of a straight line, or within 2.3 mils (0.06 mm) when interchangeability is factored in. The frequency response is excellent, rated from 0 to 10 kHz (0 to 600,000 cpm), with only a -5% deviation at the maximum frequency.

Environmental Durability

This extension cable demonstrates robust performance under extreme conditions. The probe and the Bently Nevada extension cable itself can operate in temperatures ranging from -30°F to +350°F (-34°C to +177°C). Meanwhile, the Proximitor handles even more extreme temperatures, from -60°F to +212°F (-51°C to +100°C). The system also tolerates relative humidity up to 95%, non-condensing. Additionally, for 8 mm probes, the operation remains unaffected by direct contact with substances like air, water, lube oil, ammonium hydroxide, 10% sulfuric acid, MEK, or DMF. This resistance ensures long-term reliability even in corrosive environments.

Mechanical and Installation Guide

Physical Dimensions and Armor

The 21747-040-01 model specifies a cable length of 4.0 meters. The "01" armor option provides a stainless steel braid over the cable. This armor significantly improves resistance to crushing, abrasion, and cutting. The cable is designed to pair with a probe that has an integral lead to achieve a total system length of either 5 or 9 meters from the probe tip to the Proximitor.

Installation Best Practices

Proper installation is crucial for optimal performance. First, ensure the system length is correctly calculated by matching the probe's integral lead with this Bently Nevada cable. Second, handle the cable carefully to avoid sharp bends or kinks, especially near the connectors. Third, secure the cable using appropriate clamps to prevent vibration-induced wear. Fourth, keep the connector ends clean and dry before mating. Finally, always verify the continuity and insulation resistance after installation to guarantee a faultless connection.

Packaging and Shipping

All products are shipped in new and original factory packaging. The package for the 21747-040-01 includes:

• 1 x Bently Nevada Extension Cable (4 meters with armor)

• 1 x Installation instruction sheet

Please note: Certificates and warranty documents are not included in the physical package. They are managed separately through our support team.

Shipping Methods: We utilize FedEx, UPS, and DHL for global deliveries. Expedited shipping options are available upon request.

Frequently Asked Questions (FAQ)

1. Can I use this cable with any Bently Nevada probe?
Yes, this extension cable is fully interchangeable with probes and Proximitors that share the same part number grouping, as long as the system length is maintained at 5 or 9 meters.

2. What is the benefit of the armor option (01) on this model?
The stainless steel armor provides enhanced protection against physical damage, making the 21747-040-01 ideal for installations where the cable is exposed to mechanical stress or abrasion.

3. How do I achieve the correct total system length with this cable?
You must combine the 4-meter extension cable with a probe that has an integral lead of either 1 meter or 5 meters to achieve a total system length of 5 or 9 meters respectively.

4. Is this cable suitable for high-temperature applications?
Absolutely. The extension cable operates continuously in ambient temperatures up to +350°F (+177°C), making it suitable for most industrial turbine and compressor environments.

5. What is the frequency response of this system?
The system's frequency response is rated from 0 to 10 kHz (0 to 600,000 cpm), ensuring accurate measurement for most high-speed rotating machinery.