Configured for signal transmission between proximity probes and Proximitor sensors, the Bently Nevada 21747-045-01 (21747-045-01 Extension Cable) provides direct physical execution of low-loss coaxial signal routing within legacy transducer system platforms.

Model Matrix and Configuration Breakdown

The 21747 series extension cable follows the legacy Bently Nevada configuration standard:

• 21747: Extension cable part number.

• 045: Cable length (4.5 meters).

• 01: Connector and termination option.

Hardware Specifications

Eddy-Current Probe and TSI Characteristics

This cable assembly is engineered to maintain system impedance consistency, ensuring accurate eddy-current probe scaling for vibration and displacement monitoring. Because legacy transducer systems are calibrated as an integrated set (Probe + Extension Cable + Proximitor), the cable length is a component of the overall frequency response curve. The construction utilizes standard shielding for cross-talk suppression, maintaining signal fidelity in industrial monitoring racks. Proper integration is required to achieve the -10 VDC nominal gap voltage setpoint and to prevent signal attenuation over the specified cable run.

Ordering info

• One (1) 21747-045-01 Extension Cable.

• Protective connector caps.

• Technical documentation.

• Note: This cable is designed for specific legacy system lengths; verify system-wide calibration requirements before deployment.

Field Installation Guidelines

• Routing: Install cables in dedicated conduits or trays; maintain separation from high-voltage lines to prevent electromagnetic interference.

• Connection: Ensure coaxial connectors are fully mated and hand-tightened. Do not use tools that may damage the connector bodies or center pins.

• Protection: Apply dielectric grease to connector threads in high-humidity or corrosive industrial environments to mitigate contact resistance.

• Strain Relief: Use cable clamps to provide strain relief at both the probe-end and Proximitor-end to prevent mechanical tension on the connectors.

• Bend Radius: Adhere to the minimum bend radius to avoid damaging the internal dielectric or shielding of the coaxial cable.

Frequently Asked Questions

• Does the length of the extension cable affect calibration?

  Yes. The transducer system is calibrated for a specific total length. Changing the cable length or swapping components will shift the system response.

• Is this cable compatible with 3300 XL series components?

  This 21747 series cable is primarily for legacy systems. Compatibility with 3300 XL components must be verified against specific system manuals.

• Can I shorten the 4.5 meter cable length?

  No. Altering the length changes the system impedance and frequency response, which will invalidate factory calibration and degrade vibration data.

• How do I identify a damaged cable?

  Erratic readings, noise spikes, or an open/short circuit status indicated on the monitoring rack are common signs of cable failure or connector contamination.

• What is the maximum operating temperature?

  The cable is rated for continuous operation up to +177 deg C; ensure routing avoids areas exceeding this limit.

• How do I protect the gold-plated contacts?

  Keep protective caps on connectors until the final installation step and avoid contact with industrial solvents or sharp tools.

• Does this cable require grounding?

  The cable shield is grounded through the Proximitor mounting and connection; ensure the entire system has a low-impedance path to the machine ground.

• How is electrical continuity verified?

  Continuity can be verified using a high-impedance multimeter to check for an open circuit or short between the center pin and shield.