Bently Nevada 7200-21508-02-12-10-02 | 8 mm Standard Mount Probe

Description

The Bently Nevada 7200-21508-02-12-10-02 is an 8 mm Standard Mount Probe that belongs to the high-reliability 7200 Series Proximity Transducer System. This eddy current proximity probe is engineered to measure static (gap) and dynamic (vibration) distances between the probe tip and a monitored rotating machine shaft.

This specific configuration features an 8 mm tip diameter with a 3/8-24 threaded reverse mount configuration, which allows the probe to be threaded from the inside out or fitted securely inside specialized housing assemblies. The probe does not include integrated lead armor on its unarmored cable, making it ideal for standard conduit layouts or configurations where space and flexibility are critical. Operating in tandem with a matching 7200 series Proximitor, this probe converts physical displacement into a continuous, linear voltage signal directly proportional to the relative motion of the target surface.

Features

• 8 mm tip diameter providing stable eddy-current target area excitation.
• 3/8-24 reverse thread configuration tailored for specific internal and non-standard mechanical installations.
• 1.0-meter integrated cable length providing proper reach to intermediate junction boxes or extension cables.
• Fitted with a miniature male coaxial connector for low-loss signal transfers.
• Built without structural lead armor to maximize flexibility during complex cable routing routing.

Applications

• Radial shaft vibration monitoring
• Axial thrust position measurements
• Eccentricity and shaft orbital analysis
• Speed and phase reference tracking (Keyphasor)
• Heavy rotating machinery diagnostics (turbines, compressors, and gearboxes)

Ordering Information

The following ordering matrix breakdown is extracted directly from official technical datasheets for the 7200 5 mm and 8 mm Standard Mount Probe:

• 7200-21508-02-12: Construction Case reference option designating an 8 mm probe tip diameter, reverse configuration type, and 3/8-24 threads without lead armor.
• 10: Cable Length Option designating 1.0 meter (39 inches).
• 02: Connector Option designating a miniature male coaxial connector configuration.

Technical Specifications

Installation Guidelines

• Probe Gap Adjustment: Ensure precise mechanical positioning of the probe relative to the target shaft. Check the DC voltage output at the Proximitor during setup to ensure the probe is centered in its linear calibration range.
• Thread Engagement: Ensure clean engagement of the 3/8-24 reverse threads. Avoid over-tightening during installation to prevent distorting or stripping the internal machine threads.
• Cable Routing and Protection: Since this configuration does not include lead armor, route the raw cable through a dedicated rigid or flexible industrial conduit to protect it from mechanical cuts, abrasions, or fluid exposure.
• Coaxial Connector Care: Keep the miniature male coaxial connector completely free of oil, moisture, and dust during assembly. Use self-fusing silicone tape or specialized connector boots to seal connection points inside the junction box.
• Bend Radius Constraints: Do not exceed the minimum structural bend radius of the coaxial cable during installation, as sharp bends can permanently alter internal impedance and distort data readings.

FAQ

What is the significance of the 8 mm designation? The 8 mm parameter represents the precise physical diameter of the probe tip, which defines the linear range and electrical characteristics of the proximity sensor system.

What does the reverse configuration mean for installation? A reverse configuration indicates the probe is threaded and mounted through the reverse side of a housing or sleeve, adapting it to non-standard structural clearances.

Does this version have a protective armor layer over the cable? No, this specific part number is a non-armored variant, providing greater cable flexibility for tight conduit networks.

What connector type is provided on the integrated cable? The cable terminates in a standard miniature male coaxial connector, which links directly to a matching extension cable or Proximitor.

What is the exact physical length of the integrated cable? The integrated cable is precisely 1.0 meter long, which is equivalent to 39 inches.

Can this 8 mm probe be used interchangeably with any 7200 series Proximitor? It must be paired exclusively with a 7200 series Proximitor calibrated specifically for an 8 mm probe and matching total system length.

What are the physical dimensions of the matching 7200 Proximitor housing? The matching Proximitor features a maximum height of 2.00 inches, a length of 3.12 inches, and a width of 2.38 inches.

Is it possible to splice this cable if it gets damaged in the field? No, cutting or splicing proximity probe cables changes their electrical impedance and calibration. Damaged cables require complete replacement.

What parameters can be monitored using this sensor? It is typically applied to track relative shaft vibration, dynamic axial position shifts, asset startup eccentricity, and rotational velocity.

What steps prevent signal interference on unarmored cable runs? Route the unarmored probe cable inside isolated, grounded metallic conduits away from high-voltage motor lines or variable frequency drives.