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- Bently Nevada
- 21747-070-01
- Preamplifier Probe Extension Cable
- USA
- 7 meters
- 3 kg
- Xiamen, China
- New & In Stock
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Overview
The Bently Nevada 21747-070-01 is a preamplifier probe extension cable designed to connect a compatible proximity probe and its associated preamplifier or monitoring electronics in a machinery vibration monitoring system. With a specified cable length of 7 meters and a shipping weight of 3 kg, this cable is intended for installations where the physical distance between the probe assembly and the associated signal-conditioning equipment requires additional cable reach. In rotating machinery applications, maintaining the correct cable configuration is important because the probe, extension cable, and preamplifier work together as a measurement system. The 21747-070-01 is therefore more than a simple electrical extension lead; it is a dedicated component used to maintain the required connection between proximity sensing hardware and monitoring electronics.
Technical Specifications
| Parameter | Details |
|---|---|
| Brand | Bently Nevada |
| Model | 21747-070-01 |
| Product Type | Preamplifier Probe Extension Cable |
| Cable Length | 7 meters |
| Shipping Weight | 3 kg |
| Application | Proximity Probe Signal Extension |
| System Application | Machinery Vibration and Displacement Monitoring |
| Primary Function | Connects Probe Assembly with Associated Electronics |
| Installation | Industrial Machinery Monitoring Systems |
| Cable Type | Dedicated Proximity Measurement Extension Cable |
| Typical Equipment | Rotating Machinery |
| Application Areas | Turbines, Compressors, Pumps, Motors, Generators |
Applications
Turbine Monitoring
The 21747-070-01 can be used in turbine monitoring installations where the proximity sensing assembly and monitoring electronics are separated by several meters. Its 7 meter length provides additional routing flexibility around turbine machinery.
Compressor Systems
Large compressors often require sensors to be installed close to the shaft or bearing locations while monitoring electronics are positioned in a more accessible cabinet or instrumentation area. An extension cable provides the required connection between these locations.
Pump and Motor Monitoring
For industrial pumps and motors, the cable can be used as part of a proximity measurement arrangement where the sensor location and signal-conditioning equipment are not immediately adjacent.
Generator Applications
Large generators may require dedicated shaft vibration and displacement monitoring. The extension cable helps establish the physical connection between the sensing point and the associated monitoring equipment.
Industrial Machinery Protection
The cable can be incorporated into machinery protection systems where reliable transmission of the proximity probe signal is required over a defined distance.
Cable Function
The 21747-070-01 serves an important role between the proximity probe assembly and the associated preamplifier or signal-conditioning equipment.
A typical installation can be represented as:
Proximity Probe → Extension Cable → Preamplifier / Proximity Electronics → Monitoring System
The cable allows the sensing point to remain close to the rotating shaft while the associated electronics can be located elsewhere.
This arrangement is particularly useful on large machines because the best sensor mounting position is often inside or close to the machinery, whereas monitoring equipment is normally installed in an instrumentation cabinet or protected area.
The 7 meter cable length provides a defined connection distance, but cable length should always be considered together with the exact probe, preamplifier, and monitoring system configuration. A cable that physically reaches the equipment is not necessarily electrically interchangeable with another cable.
Key Benefits
| Feature | Benefit |
|---|---|
| 7 Meter Length | Provides additional routing distance between the sensing point and associated electronics. |
| Dedicated Proximity Application | Designed for use within a machinery monitoring measurement chain rather than general-purpose wiring. |
| Installation Flexibility | Allows monitoring electronics to be positioned away from the rotating machine. |
| Suitable for Large Machinery | Practical for turbine, compressor, generator, and other large equipment installations. |
| System-Level Compatibility | Helps maintain the intended connection between the probe assembly and signal-conditioning equipment. |
| Replacement Value | Provides a dedicated replacement option when an existing cable is damaged or requires renewal. |
Compatible Components
The extension cable should be selected according to the complete monitoring system rather than cable length alone.
| Component | Function |
|---|---|
| Bently Nevada Proximity Probe | Detects shaft displacement or relative vibration without physical contact. |
| 21747-070-01 Cable | Extends the connection between the sensing assembly and associated electronics. |
| Preamplifier / Proximity Electronics | Conditions the probe signal for transmission to the monitoring system. |
| Machinery Monitoring System | Receives and processes the measurement signal for condition monitoring and protection. |
| Probe Mounting Hardware | Secures the proximity probe at the required measurement location. |
| Rotating Shaft Target | Provides the conductive target detected by the proximity sensing system. |
Installation
Cable installation is just as important as the selection of the correct cable model. The 21747-070-01 should be routed so that it is protected from excessive mechanical stress, sharp edges, extreme heat, and unnecessary interference from high-power electrical equipment.
During installation or replacement, technicians should check:
- Cable model and complete part number
- 7 meter cable length
- Connector compatibility
- Probe compatibility
- Preamplifier or proximity electronics compatibility
- Cable routing
- Connector condition
- Mechanical strain on the cable
- Signal quality after commissioning
The cable should not be treated as a generic extension cable simply because its main function is signal extension. In a proximity measurement system, the cable forms part of the electrical characteristics of the complete sensor circuit. Using an unsuitable cable can therefore affect measurement performance.
Troubleshooting
| Symptom | Possible Cause | Recommended Check |
|---|---|---|
| No Signal | Loose connector, damaged cable, or incompatible equipment | Check both cable ends and the complete measurement chain. |
| Intermittent Signal | Cable damage or connector instability | Inspect the cable route and connector condition. |
| Unstable Reading | Signal connection problem or incorrect system configuration | Check the cable and associated proximity electronics. |
| Excessive Electrical Noise | Cable routed too close to high-power equipment | Inspect cable routing and possible interference sources. |
| Signal Loss After Replacement | Incorrect cable or incompatible system component | Verify the complete part number and system configuration. |
| Mechanical Damage | Improper routing or excessive bending | Inspect the cable for cuts, crushing, or excessive stress. |
Recommended Models
| Model | Product Type | Application |
|---|---|---|
| 21747-070-01 | Preamplifier Probe Extension Cable | 7 meter proximity measurement connection |
| Bently Nevada 7200 Series Probe Cables | Proximity Probe Cable | Connection within 7200-series monitoring systems |
| Bently Nevada 3300 XL Extension Cables | Proximity Extension Cable | Probe-to-Proximitor signal connection |
| Bently Nevada 3300 XL 8 mm Probes | Eddy-Current Proximity Probe | Shaft vibration and displacement monitoring |
| Bently Nevada 7200 Proximity Probes | Proximity Probe | Rotating machinery monitoring |
| Bently Nevada Proximitor Sensors | Signal Conditioner | Proximity probe signal processing |
Related Products
| Product / Series | Product Type | Main Application |
|---|---|---|
| 7200 Series | Proximity Transducer System | Shaft vibration and displacement monitoring |
| 3300 XL 8 mm Series | Proximity Measurement System | Rotating machinery condition monitoring |
| 3300 XL Proximitor Sensor | Signal Conditioner | Probe signal processing |
| 3300 XL Extension Cable | Extension Cable | Probe-to-Proximitor connection |
| 3300 Monitoring System | Machinery Monitoring System | Machinery protection |
| Bently Nevada Proximity Probes | Eddy-Current Sensors | Shaft position and vibration measurement |
Technical FAQs
1. What is the Bently Nevada 21747-070-01?
The 21747-070-01 is a Preamplifier Probe Extension Cable used in Bently Nevada proximity measurement systems. It provides the connection between a compatible probe assembly and the associated preamplifier or signal-conditioning electronics.
2. What is the function of the 21747-070-01 cable?
The cable extends the electrical connection between the proximity probe and associated electronics, allowing the sensing point and monitoring equipment to be installed at different physical locations. This is particularly useful on large rotating machinery where the probe must be mounted close to the shaft while the electronics are located in an instrumentation area.
3. What is the cable length of the 21747-070-01?
The specified cable length is 7 meters. This length provides additional installation flexibility for machinery monitoring applications where the distance between the probe and associated electronics requires an extended connection.
4. What equipment is the 21747-070-01 used with?
The cable is intended for use within a Bently Nevada proximity measurement system, where it connects compatible sensing and signal-conditioning components. The exact probe, preamplifier, and monitoring electronics should be checked before selecting a replacement cable.
5. Can another 7-meter cable be used as a replacement?
Not necessarily. Cable length alone does not determine compatibility. The cable’s electrical characteristics, connectors, probe configuration, and associated preamplifier or monitoring electronics should all match the existing system. Using a generic cable with the same length may result in incorrect or unstable proximity measurements.