Configured for radial vibration and axial position monitoring, the Bently Nevada 21504-00-32-10-02 (21504 Proximity Probes) provides direct physical signal execution via eddy-current induction within 3000 series transducer systems.

Model Matrix

The 21504-00-32-10-02 designates a specific physical configuration for 3000 series probes. The numeric string defines the unthreaded case length, total body length, and electrical termination interface tailored for integration with compatible 3000 series monitor racks.

Hardware Specifications

Rotor Dynamics and Transducer Scaling

The 21504 probe utilizes an electromagnetic field to measure the proximity of a metallic target. The system relies on precise eddy-current probe scaling to ensure that the output voltage remains linear relative to the gap distance. Operators must ensure gap voltage validation is maintained at the -10 VDC nominal operating point to prevent signal clipping at the monitor input. In high-density mounting arrays, cross-talk suppression is maintained by adhering to minimum spatial separation requirements to avoid interference from the high-frequency carrier signal.

Ordering Info

• One (1) 21504-00-32-10-02 Proximity Probe

• Integrated coaxial lead with standard connector

• Two (2) 3/8-24 UNF stainless steel lock nuts

• Calibration documentation for standard 4140 steel target

Field Installation Guidelines

• Mounting Alignment:

• Install the probe perpendicular to the shaft centerline to ensure output linearity.

• Use a depth micrometer to achieve the required mechanical gap prior to securing lock nuts.

• Termination and Shielding:

• Ensure the connector is fully seated to prevent signal noise from intermittent contact.

• Route signal cables through dedicated grounded conduit to minimize electromagnetic interference (EMI).

• Grounding:

• Ensure the stainless steel probe body maintains electrical continuity with the machine chassis to provide a reference ground for the coaxial shield.

Frequently Asked Questions

• What happens if the gap is set outside the linear range?

  Setting the gap outside the linear range leads to signal distortion or saturation, resulting in incorrect vibration or displacement readings.

• Can this probe be used for speed measurement?

  Yes, the probe generates a pulse signal when detecting surface discontinuities like keyways or notches, suitable for speed-sensing modules.

• How is electrical isolation maintained?

  The probe tip is electrically isolated from the metal housing, which prevents the formation of ground loops that could introduce noise into the TSI system.

• Is the probe cable length field-modifiable?

  No. The coaxial cable is factory-matched to the system impedance. Altering the length will invalidate the calibration and cause signal reflections.

• Why is a -10 VDC setpoint used?

  The -10 VDC point centers the transducer in its linear operating range, allowing for maximum signal swing without hitting the power supply rails.

• What target materials affect the output?

  The probe is calibrated for 4140 steel. Other conductive materials will shift the sensitivity, necessitating a scale factor change at the monitor.

• How do I test for a cable break?

  A cable break or open circuit typically manifests as a voltage swing to the negative power rail or zero, which can be verified at the monitor terminal block.

• Can this probe be used in high-vibration zones?

  Yes, provided the housing is mounted to a rigid, resonance-free bracket to prevent independent vibration of the transducer.