Configured for high-accuracy displacement measurement in vibration monitoring architectures, the Bently Nevada 21504-000-008-05-02 (21504-000-008-05-02 Proximity Probes) provides direct physical signal generation based on proximity to conductive rotating targets.

Configuration Matrix

• Model: 21504
• Unthreaded Length: 0.0 inches
• Overall Case Length: 8 mm
• Total Length: 0.5 metre (20 inches)
• Connector: Miniature male coaxial connector

Hardware Specifications

Rotor Dynamics & Signal Integrity

The transducer utilizes eddy-current probe scaling to ensure linear displacement response relative to the shaft surface. Consistent operation requires gap voltage validation to maintain -10 VDC targets during standard machine operation. To ensure valid data acquisition, cross-talk suppression must be maintained by verifying proper spatial orientation of the probe relative to adjacent sensors, thereby preventing interference in the rotor dynamics monitoring path.

Ordering info

1. 1 x 21504-000-008-05-02 Proximity Probe
2. 1 x Threaded installation nut

Field Installation Guidelines

• Mounting: Thread the probe into the mounting assembly until the desired gap is achieved; ensure the lock nut is tightened to prevent loosening from machine vibration.
• Gap Adjustment: Utilize a feeler gauge to set the mechanical gap between the probe tip and the target, confirming the voltage output matches system requirements.
• Grounding: Verify the probe tip is electrically insulated from the machine casing unless the specific monitoring architecture dictates a grounded configuration.
• Cabling: Route the coaxial cable through shielded conduits to minimize electromagnetic noise and secure the connector to prevent mechanical strain.

Frequently Asked Questions

• Is this probe compatible with 3300 series monitoring systems?

  The 7200 series probes are specifically engineered for the 7200 monitoring system; cross-compatibility with 3300 series hardware is limited and should be verified.

• How is the 8 mm case length measured?

  The case length represents the physical dimension from the probe tip to the connector end of the probe body, excluding the cable assembly.

• What is the maximum operating distance?

  The linear range is defined by the proximity system calibration; typical operation requires maintaining the gap within the specified linear range limits.

• Can the cable be cut to a shorter length?

  The total system length is calibrated for impedance; cutting the cable will alter signal characteristics and degrade measurement accuracy.

• What does the miniature male coaxial connector interface with?

  The connector mates directly with the compatible 7200 series extension cable; ensure the connection is clean and free of contaminants before mating.

• How does temperature affect probe performance?

  The probe is rated for high-temperature environments; however, thermal expansion of the probe mounting can shift the gap setting over time.

• Can this probe measure non-metallic targets?

  Eddy-current probes rely on the electrical conductivity of the target; non-metallic materials will not generate the required signal for displacement measurement.

• What is the purpose of the 0.0 inches unthreaded length?

  The zero unthreaded length indicates the entire length of the probe case is threaded, allowing for maximum adjustment flexibility during installation.