The Bently Nevada 7200-21508-02-12-10-02, also cataloged as the 7200-21508 Proximity Probe, operates as a dedicated hardware component for eddy-current displacement measurement within 7200 Series transducer system platforms.

Model Configuration Matrix

• 7200-21508: 7200 Series 8 mm proximity probe base model.

• 02: 3/8-24 UNF thread configuration.

• 12: 12 mm unthreaded case length.

• 10: 10 mm total case length.

• 02: Miniature coaxial connector interface.

Hardware Specifications

Mechanical Monitoring and Signal Validation

This probe utilizes eddy-current induction for non-contact distance measurement. Precise rotor dynamics analysis requires strict adherence to gap voltage validation; the system is typically configured for a nominal -10 VDC center gap at the Proximitor sensor output. To ensure signal fidelity and minimize noise injection, practitioners must implement cross-talk suppression by maintaining appropriate physical separation between adjacent probes. Scaling and linearity are contingent upon the target material's electrical properties, requiring verification against AISI 4140 steel calibration standards.

Ordering Information

• 7200-21508-02-12-10-02 Proximity Probe

• Integrated connector interface

• Mounting hardware (locknuts)

• Compliance and technical documentation

Field Installation Guidelines

• Mounting: Install the probe into a rigid, grounded mounting bracket. Ensure the probe tip is centered and perpendicular to the rotating target shaft.

• Gap Setting: Use a high-precision feeler gauge to set the physical air gap; monitor the output voltage at the Proximitor terminal to confirm it aligns with the system's -10 VDC nominal center point.

• Cabling: Use only shielded coaxial cabling routed through grounded metal conduits. Ensure that the total system length (probe plus cable) matches the Proximitor calibration requirement.

• Grounding: Terminate the coaxial cable shield at the Proximitor sensor end only to prevent ground loops and reduce signal noise.

Technical FAQ

1. What material targets are supported?

   The probe is factory-calibrated for AISI 4140 steel targets. Application on non-standard materials requires specific calibration factor adjustments.

2. What is the probe sensitivity?

   The 7200 Series system standard sensitivity is 7.87 V/mm (200 mV/mil).

3. What causes unstable gap voltage?

   Instability is generally triggered by electrical noise, poor shield continuity, or physical contact between the probe tip and the rotating target surface.

4. How is probe health tested?

   Probe health is confirmed by measuring the loop resistance, coaxial shield integrity, and verifying the DC gap voltage linearity.

5. Can the probe operate in hazardous environments?

   Verify the specific part number suffix against local hazardous area installation requirements. Standard 7200 Series units may not meet all current regulatory explosion-proof requirements.

6. What extension cables are compatible?

   This probe is compatible only with 7200 Series extension cables; interchanging with 3300 XL series components will cause significant measurement error.