Bently Nevada 21747-080-00 Extension Cable 8m Non-Armored

21747-080-00 Bently Nevada Extension Cable

Product Introduction

The Bently Nevada 21747-080-00 is a precision extension cable engineered for the 3300 XL series proximity measurement systems. This model features an extended 8.00-meter (315 inches) length, which allows for greater separation between the probe and the Proximitor. Specifically, it includes the "00" option, meaning it comes without armor. This non-armored configuration offers increased flexibility, making it easier to route through tight spaces and conduits. Meanwhile, it maintains all the electrical performance characteristics required for accurate vibration monitoring. Therefore, this cable is an ideal choice for standard installations where extreme physical protection is not a primary concern.

Technical Specifications

Electrical and Output Parameters

The 21747-080-00 operates with a power input range of -17.5 Vdc to -26 Vdc, drawing a maximum current of 12 mA. Its calibrated measurement range is 80 mils (2.0 mm), with the linear region beginning at approximately 10 mils (0.25 mm) from the probe face. When calibrated as a complete system, it delivers a scale factor of 200 mV/mil (7.87 V/mm) with an accuracy of ±4%. Furthermore, when considering probe and cable interchangeability, the accuracy remains within ±9.5%. The linearity is excellent, performing 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. Moreover, the frequency response extends from 0 to 10 kHz (0 to 600,000 cpm), with only a -5% deviation at the highest frequency.

Environmental and Physical Durability

This Bently Nevada extension cable demonstrates robust performance across a wide temperature range. Both the probe and the 21747-080-00 cable operate reliably between -30°F and +350°F (-34°C to +177°C). In comparison, the Proximitor handles 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, direct contact with various substances—including air, water, lube oil, ammonium hydroxide, 10% sulfuric acid, MEK, and DMF—does not affect operation. This chemical resistance ensures long-term durability in many industrial settings.

Mechanical and Installation Guide

Cable Design and Flexibility

The 21747-080-00 model specifies a cable length of 8.0 meters. The "00" armor option means this cable does not include stainless steel braiding. Consequently, it is lighter and more flexible than its armored counterpart. This flexibility simplifies installation in applications with complex cable routing paths. 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.

Step-by-Step Installation Tips

Proper installation ensures optimal system performance. First, always confirm the total system length by matching the probe's integral lead with this 8-meter extension cable. Second, route the cable away from high-voltage lines to avoid electrical interference. Third, use cable ties or clamps to secure the cable and prevent movement that could stress the connectors. Fourth, avoid pulling the cable with excessive force during installation. Finally, inspect the connectors for dirt or damage before mating them to the probe and Proximitor to ensure a clean signal path.

Packaging and Shipping

All products are dispatched in new and original factory packaging to guarantee authenticity. The package for the 21747-080-00 includes:

• 1 x Bently Nevada Extension Cable (8 meters, non-armored)

• 1 x Installation instruction sheet

Please note: Certificates and warranty documentation are managed separately and are not included inside the package.

Shipping Methods: We use FedEx, UPS, and DHL for all global shipments. Tracking information is provided upon dispatch.

Frequently Asked Questions (FAQ)

1. What is the total system length I can achieve with this cable?
You can achieve a total system length of either 5 or 9 meters. For instance, pair this 8-meter cable with a 1-meter probe lead for a 9-meter system, or with other lengths to achieve 5 meters.

2. Why would I choose the non-armored version (00) over the armored one?
The non-armored version offers greater flexibility and is lighter, making it easier to route through conduits and tight spaces where physical damage is unlikely.

3. Is the 21747-080-00 interchangeable with other Bently Nevada cables?
Yes, probes and cables of the same length, and Proximitors with the same part number, are completely interchangeable, ensuring easy replacement and maintenance.

4. What is the frequency response of this system?
The system provides a frequency response from 0 to 10 kHz, which corresponds to 0 to 600,000 cpm, suitable for most high-speed rotating machinery.

5. Can this cable withstand high humidity environments?
Yes, the cable and probe operate reliably in environments with relative humidity up to 95%, as long as there is no condensation.