Bently Nevada 21747-085-01 Extension Cable

Product Introduction

The Bently Nevada 21747-085-01 is an extension cable that supports reliable condition monitoring on rotating machinery. As a genuine Bently Nevada part, it integrates with existing protection loops and is available from TenBN with the official service documentation.

Technical Parameters

• Model: 21747-085-01
• Product Type: Extension Cable
• Product Series: 21504 / 21505 / 21508 / 21747
• Cable length Option: 085 8.50 metres(335 inches)
• Armor Option: 01 – Witht armor
• Power: -17.5 Vde to -26 Vdc at 12 mAmaximum consumption
• Calibrated Range: 80 mils (2.0 mm).Begins at approximately 10 mils(0.25 mm) from probe face
• Temperature Sensitivity: Typically-396change in scale factor at + 150°F(+ 65°C) at 50 mils gap (1.27 mm)
• Proximitor: -60°F to +212°F(-51°Cto +1009C)
• Probe and Extension Cable: -30°F to0+350°F(-34°Cto +177°C)Relative Humidity: To 95%,noncondensing

Parameter Analysis

Configuration of the 21747-085-01 is carried entirely in its part number, which makes the full string the reference point for spare parts planning and system design. The cable length Option specifies 085 8.50 metres(335 inches). The armor Option specifies 01 – Witht armor. The unit is rated for operation from Typically-396change in scale factor at + 150°F(+ 65°C) at 50 mils gap (1.27 mm).

Because cable, probe, and Proximitor are calibrated as a system, keeping the same part numbers across the loop preserves scale factor accuracy and simplifies replacement during outages.

Application Scenarios

This extension cable connects the proximity probe to its Proximitor on turbines, compressors, pumps, and other rotating equipment, routing the measurement signal from the machine casing to the electronics location while preserving signal integrity over the full system length.

Installation Guide

Plan the run so that probe integral lead plus extension cable matches the intended total system length, route the cable away from pinch points and hot surfaces, and seat the connectors fully. Verify the loop after installation by confirming the probe gap voltage at the monitor.

Compatibility

This component belongs to the 8 mm proximity system and is engineered to work with the associated probes, extension cables, Proximitors, and monitoring hardware of the same system. Bently Nevada components sharing the same part number are fully interchangeable, so a stocked spare can be fitted without re-engineering the measurement loop. TenBN can supply the complete chain under consistent part numbers.

Maintenance Advice

Inspect the cable jacket and connectors during outages for cuts, moisture ingress, or loosened couplings, and confirm the run remains clear of abrasive surfaces. Keep the unit within its Typically-396change in scale factor at + 150°F(+ 65°C) at 50 mils gap (1.27 mm) operating envelope in service and storage.

Procurement Advice

This unit is supplied new & original in factory packing with 12 months factory warranty. Confirm the complete part number against your machine’s bill of materials before ordering, since each option digit changes the mechanical or electrical fit. TenBN stocks genuine Bently Nevada components and provides the official service documentation for this model. For inventory, pricing, and lead time on the 21747-085-01, contact [email protected].

Frequently Asked Questions

What is the operating temperature range?

The unit is rated from Typically-396change in scale factor at + 150°F(+ 65°C) at 50 mils gap (1.27 mm), covering the temperature extremes typical of turbomachinery installations.

Can this spare be interchanged with existing components?

Bently Nevada components sharing the same part number are fully interchangeable, so this spare can replace an existing unit without recalibrating the loop when the complete part number matches.

How do I confirm the right part number?

Check every option digit against the machine bill of materials, then contact [email protected] with the full string; the TenBN team will confirm fit, stock, and documentation.