Bently Nevada 21747-085-01 Extension Cable 8.5m Armored

21747-085-01 Bently Nevada Extension Cable

Product Introduction

The Bently Nevada 21747-085-01 is a high-performance extension cable specifically designed for the 3300 XL series proximity monitoring systems. This particular model provides an extended length of 8.50 metres (335 inches), which offers significant flexibility for equipment layout and installation. Moreover, it includes the "01" armor option, featuring a rugged stainless steel braid that delivers enhanced resistance to physical abuse. Consequently, this cable is exceptionally well-suited for harsh environments where mechanical stress, abrasion, or impact are concerns. The combination of extended reach and robust construction makes it an outstanding choice for critical turbine, compressor, and pump monitoring applications.

Technical Specifications

Electrical Performance Characteristics

The 21747-085-01 operates with a power supply ranging from -17.5 Vdc to -26 Vdc, consuming a maximum of 12 mA. Its calibrated measurement range spans 80 mils (2.0 mm), with the linear region initiating at approximately 10 mils (0.25 mm) from the probe face. When calibrated as an integrated system, it delivers a scale factor of 200 mV/mil (7.87 V/mm) with an accuracy of ±4%. Furthermore, when accounting for interchangeability between different probes and cables, the accuracy remains within a ±9.5% tolerance. The linearity performance is equally impressive, operating within 0.8 mils (0.02 mm) of a straight line under system calibration, or within 2.3 mils (0.06 mm) when interchangeability errors are included. Additionally, the frequency response extends from 0 to 10 kHz (0 to 600,000 cpm), with only a -5% deviation at the maximum frequency threshold.

Temperature and Environmental Resilience

This Bently Nevada extension cable demonstrates exceptional durability across extreme temperature conditions. Both the probe and the 21747-085-01 cable function reliably in ambient temperatures ranging from -30°F to +350°F (-34°C to +177°C). Meanwhile, the Proximitor operates within an even broader range of -60°F to +212°F (-51°C to +100°C). The entire system withstands relative humidity levels up to 95%, provided condensation does not occur. For 8 mm probes, the operation remains unaffected by direct contact with various substances, including air, water, lube oil, ammonium hydroxide, 10% sulfuric acid, MEK, and DMF. This chemical resistance ensures sustained performance in aggressive industrial environments.

Mechanical and Installation Guide

Armor Design and Physical Protection

The 21747-085-01 distinguishes itself through its robust "01" armor option. This stainless steel braiding wraps around the cable core, providing superior protection against crushing, cutting, and abrasion. Consequently, this armored construction significantly extends the cable's service life in demanding installations. The 8.50-metre length allows for substantial distance between the probe and Proximitor, accommodating large machinery configurations. This cable is designed to pair with a probe featuring an integral lead to achieve a total system length of either 5 or 9 metres from the probe tip to the Proximitor.

Comprehensive Installation Guidelines

Following proper installation procedures maximizes system reliability and measurement accuracy. First, verify that the total system length matches either 5 or 9 metres by correctly matching the probe's integral lead with this 8.5-metre extension cable. Second, handle the armored cable carefully to avoid kinking, as the stainless steel braid can be difficult to straighten once bent sharply. Third, secure the cable at regular intervals using appropriate clamps to prevent vibration-induced wear at connection points. Fourth, ensure connectors remain clean and dry before mating to maintain signal integrity. Finally, perform a continuity test after installation to confirm a complete and fault-free electrical path.

Packaging and Shipping

All products are shipped in new and original factory packaging to guarantee authenticity and protection during transit. The package for the 21747-085-01 includes:

• 1 x Bently Nevada Extension Cable (8.5 metres with stainless steel armor)

• 1 x Installation instruction sheet

Please note: Certificates of conformity and warranty documents are managed through our support department and are not physically included in the package.

Shipping Methods: We utilize FedEx, UPS, and DHL for reliable global delivery. Express shipping options are available upon request.

Frequently Asked Questions (FAQ)

1. What total system length can I achieve with this cable?
You can achieve a total system length of either 5 or 9 metres. For example, pair this 8.5-metre cable with a 0.5-metre probe lead for a 9-metre system, or with other compatible lead lengths for a 5-metre configuration.

2. What is the advantage of the armored option (01) on this model?
The stainless steel armor provides critical protection against physical damage, including crushing, abrasion, and cutting. This makes the 21747-085-01 ideal for installations where the cable is exposed to mechanical stress.

3. Are Bently Nevada probes and cables interchangeable with this model?
Yes, probes and cables of the same length, and Proximitors with the same part number, are completely interchangeable. This ensures easy replacement and maintenance without requiring system recalibration.

4. What is the frequency response capability of this system?
The system offers a frequency response from 0 to 10 kHz, which corresponds to 0 to 600,000 cycles per minute, making it suitable for most high-speed rotating machinery.

5. Can this cable withstand high-temperature environments?
Absolutely. The extension cable operates continuously in temperatures up to +350°F (+177°C), making it suitable for demanding applications near turbines, compressors, and other high-heat equipment.