Product Overview

The Bently Nevada 21747-245-00 is a 7200 Series Extension Cable intended for use in compatible Bently Nevada machinery monitoring systems. Its primary function is to extend the connection between a machine-mounted transducer and the associated monitoring or signal-conditioning equipment.

At 24.5 meters, this cable is intended for installations where the sensing location and instrumentation equipment are separated by a substantial distance. This type of arrangement can occur on large turbines, compressor trains, generators, and plant machinery where the monitoring cabinet is installed in a dedicated instrumentation room or at a considerable distance from the machine.

The long cable length also makes installation planning particularly important. The cable should be routed along an established instrumentation path, adequately supported, and protected from mechanical damage. When replacing an existing cable, the complete 21747-245-00 part number should be checked against the installed 7200 Series configuration.

Technical Specifications

Product Features

• 7200 Series extension cable — Used as part of compatible Bently Nevada 7200 Series transducer installations.
• 24.5-meter cable length — Suitable for extended distances between machinery sensing points and monitoring equipment.
• Long-distance signal routing — Allows the sensing element to remain at the machine while monitoring equipment can be installed in a remote instrumentation location.
• Machinery monitoring application — Supports wiring arrangements associated with vibration and shaft-position monitoring.
• Dedicated part number — Simplifies identification during maintenance, replacement, and spare-parts planning.
• Suitable for large equipment layouts — Particularly useful where conventional short cable lengths cannot reach the monitoring cabinet.

Working Principle

The 21747-245-00 functions as the extension section of a compatible 7200 Series transducer circuit. The sensing element is installed at the required measurement point, and the extension cable carries the transducer signal over the required distance to the associated monitoring equipment.

A 24.5-meter cable is especially relevant when the monitoring cabinet cannot be positioned near the monitored machine. For example, a turbine or compressor may have sensors installed around the machine casing while the instrumentation equipment is located in a separate control or equipment room. The extension cable bridges this physical distance without requiring the monitoring electronics to be installed beside the machinery.

The cable does not independently measure or analyze the machine condition. Its role is to maintain the electrical connection within the complete measurement chain. Consequently, correct cable selection, routing, termination, and physical protection all matter during installation.

Role in a 7200 Series Machinery Monitoring System

Industrial Applications

Installation and Maintenance

1. Confirm the complete system configuration — Verify that the 21747-245-00 matches the applicable 7200 Series transducer and monitoring arrangement.
2. Plan the long cable route — A 24.5-meter cable should follow a deliberate instrumentation route rather than being left loosely around the equipment.
3. Provide adequate mechanical support — Secure the cable along the route to minimize movement caused by machinery vibration or accidental contact.
4. Maintain separation from hazardous mechanical areas — Keep the cable away from rotating components, couplings, shafts, hot surfaces, and locations subject to mechanical impact.
5. Consider electrical routing — Where practical, avoid unnecessary parallel routing with high-power motor, generator, or switching cables that may introduce electrical interference.
6. Inspect during scheduled shutdowns — Check for abrasion, crushing, insulation damage, loose connections, and other signs of deterioration.
7. Verify the measurement channel after replacement — Confirm correct signal transmission through the complete transducer chain before returning the monitoring or protection channel to service.

Related Components

Recommended Related Models

Key Advantages

• 24.5-meter cable length supports long-distance machinery-to-instrumentation routing.
• Intended for compatible Bently Nevada 7200 Series monitoring arrangements.
• Allows machine-mounted transducers to remain close to the measurement point.
• Suitable for large turbines, compressors, generators, pumps, and other rotating equipment.
• Dedicated part number simplifies maintenance identification and spare-parts management.
• Useful when monitoring equipment must be installed away from the immediate machinery area.

Technical FAQs

Why is a 24.5-meter extension cable useful in a machinery monitoring installation?

It accommodates a substantial physical distance between the machine-mounted transducer and the monitoring equipment. This is useful when instrumentation cabinets are located in a separate control or equipment area rather than directly beside the machine.

Does the 21747-245-00 replace the need for a separate transducer?

No. The extension cable is only one part of the measurement chain. A compatible 7200 Series transducer and the appropriate monitoring or signal-conditioning equipment are still required.

What is especially important when routing a 24.5-meter cable?

Longer cable routes require careful mechanical support and route planning. The cable should be protected from vibration, abrasion, excessive heat, moving machinery, and accidental impact. Its route should also be considered in relation to nearby high-power electrical wiring.

Should the entire monitoring channel be tested after installing the 21747-245-00?

Yes. Because the extension cable forms part of the transducer signal path, the complete channel should be checked after installation. Confirm the expected signal at the monitoring equipment before returning the associated machinery monitoring or protection function to normal operation.