Product Overview

The Bently Nevada 21747-055-01 is a 7200 Series Extension Cable used as part of a proximity transducer measurement chain. In a typical machinery monitoring installation, the extension cable connects the probe-side assembly with the associated monitoring or signal-conditioning equipment, allowing the electrical signal from the transducer system to reach the monitoring channel.

The 21747-055-01 belongs to the Bently Nevada 7200 Series, a family commonly associated with vibration, position, and rotating-machinery monitoring. A correctly matched extension cable is important because the cable forms part of the overall measurement circuit rather than functioning as an ordinary general-purpose signal cable.

With a cable length of 5.5 meters, this model can be useful where the monitored machine and the monitoring cabinet are separated by a moderate physical distance. Typical installations include turbine auxiliary equipment, compressors, pumps, generators, and other rotating machinery where the probe wiring must be routed from the machine casing toward a protected instrumentation cabinet.

Technical Specifications

Product Features

• 7200 Series compatibility — Intended for use within the Bently Nevada 7200 Series monitoring architecture.
• 5.5-meter cable length — Provides additional routing distance between the transducer assembly and monitoring equipment.
• Machinery monitoring application — Suitable for wiring arrangements associated with vibration and shaft-position measurement.
• Signal-chain component — Functions as part of the complete probe, extension cable, and monitoring channel arrangement.
• Cabinet-to-machine routing — Useful when the monitoring electronics are installed away from the monitored machine.
• Maintenance-friendly replacement — The defined part number simplifies identification when replacing an existing extension cable during machinery maintenance.

Working Principle

The 21747-055-01 does not independently measure vibration or shaft position. Its function is to extend the electrical connection within the 7200 Series transducer system.

In a practical installation, the probe is mounted close to the rotating shaft or machine component being monitored. The extension cable then carries the probe signal toward the monitoring or conditioning equipment located in a control or instrumentation cabinet. The monitoring electronics interpret the incoming signal and use it for machinery condition monitoring, protection, or operational diagnostics.

Cable routing matters because the extension cable becomes part of the measurement path. During installation, technicians should keep the cable properly supported and separated from sources of excessive mechanical stress and electrical interference.

Role in a Rotating Machinery Monitoring System

Industrial Applications

Installation and Maintenance

1. Confirm the complete measurement chain — Verify that the probe, extension cable, and monitoring equipment are compatible with the intended 7200 Series configuration.
2. Route the cable carefully — Avoid sharp bends, crushing, excessive pulling force, and locations where the cable can be damaged by moving machinery.
3. Separate from strong interference sources — Where practical, maintain suitable routing away from high-current power cables, motors, and other major sources of electrical noise.
4. Protect machine-side wiring — Cable sections near turbines, compressors, and pumps should be protected against vibration, heat, abrasion, and accidental contact with moving components.
5. Inspect connectors during maintenance — Check connection points for contamination, corrosion, mechanical damage, or poor seating before returning the monitoring channel to service.
6. Use the original part number when replacing the cable — Confirm the 21747-055-01 designation against the existing machinery monitoring configuration before installation.

Related Components

Recommended Related Models

Key Advantages

• 5.5-meter extension length for moderate machine-to-cabinet distances.
• Intended for the Bently Nevada 7200 Series measurement architecture.
• Supports proper routing of transducer signals between machinery and monitoring equipment.
• Useful for turbine, compressor, pump, generator, and other rotating-equipment installations.
• Identifiable by a dedicated Bently Nevada part number for maintenance and replacement planning.
• Suitable as a replacement component when the original extension cable requires renewal.

Technical FAQs

What function does the Bently Nevada 21747-055-01 perform in a 7200 Series system?

It extends the electrical connection between the 7200 Series transducer assembly and the associated monitoring or signal-conditioning equipment. It does not perform the vibration measurement itself.

Is the 5.5-meter length important when configuring the transducer system?

Yes. Cable length forms part of the physical and electrical arrangement of a transducer measurement chain. The extension length should match the intended 7200 Series configuration rather than being selected only according to physical reach.

Where should the 21747-055-01 normally be routed?

The cable is normally routed from the machine-mounted transducer area toward the monitoring cabinet or signal-conditioning equipment. It should be secured against vibration and abrasion and kept away from unnecessary mechanical stress and strong electrical interference.

What should be checked when replacing an existing 7200 Series extension cable?

Verify the exact part number, required cable length, probe and monitoring-system compatibility, connection condition, and cable routing. After replacement, the complete measurement channel should be checked before the machinery protection or monitoring system is returned to normal operation.