When Vibration Data Goes Missing
A failing probe reading on a critical turbine can force unplanned downtime within hours. The Bently Nevada 146055-90-02-00 solves that problem directly: it is a 3300 ceramic capped reverse mount probe built for 9.0 m (29.5 ft) runs, with 3/8-24 UNF threads and a miniature ClickLoc coaxial connector. This is the exact spare you install when a machine protection system must return to service without delay.
What the 146055-90-02-00 Delivers
The reverse mount design places the probe body behind the mounting surface, which protects the ceramic tip in tight or recessed machine housings. The alumina ceramic (Al2O3) tip resists wear from oil mist, metal debris, and repeated target passes. The AISI 304 stainless steel case handles washdown and corrosive plant atmospheres.
Key Specifications
| Parameter | Value |
|---|---|
| Probe case thread | 3/8-24 UNF |
| Total length | 9.0 m (29.5 ft) |
| Connector | Miniature ClickLoc coaxial, standard cable |
| Probe tip material | Alumina ceramic (Al2O3) |
| Probe case material | AISI 304 stainless steel |
| Cable | 75 Ω coaxial, FEP insulated |
| Operating temperature | -51°C to +177°C (-60°F to +351°F) |
| Pressure rating | Sealed to 34 Bar (500 psi) nitrogen |
| Nominal DC resistance | 9.87 ± 0.90 ohms |
| Linear range | 1.52 mm (60 mils) |
| Incremental scale factor | 7.87 V/mm (200 mV/mil) ±6.5% |
Solving Three Plant Pain Points
Pain point 1: short cable runs force junction boxes into hot zones. The 9.0 m length lets you route the probe cable to a cooler, accessible location without an intermediate connector. Fewer connections mean fewer failure points and cleaner signal integrity.
Pain point 2: probe tips wear out in abrasive service. The ceramic cap on this 3300 probe stands up to particulate-laden lube oil and high-velocity gas streams. That translates to longer replacement intervals and lower maintenance spend.
Pain point 3: mismatched spares stall turnarounds. Because the 146055-90-02-00 uses standard 3/8-24 UNF threads and a ClickLoc connector, it drops into existing 3300 mounting hardware and extension cables. No re-machining, no adapter hunting.
Where This Probe Fits
Steam and gas turbines, centrifugal compressors, and large motors all rely on eddy-current displacement measurement for radial vibration and axial position. The 34 Bar (500 psi) pressure seal suits high-pressure casing penetrations. With a -51°C to +177°C range, the probe works in both arctic and hot-process environments.
Installation and Setup Notes
Thread the probe into the 3/8-24 UNF mounting hole and confirm the maximum thread engagement of 0.563 in. Keep the target within the linear range of 1.52 mm (60 mils), which begins approximately 0.25 mm (10 mils) from the target. Route the FEP cable away from high-voltage runs to protect signal quality. Verify the nominal DC resistance of 9.87 ± 0.90 ohms at the connector before commissioning.
Maintenance and Reliability
Inspect probe tips during scheduled outages for ceramic chipping or conductive buildup. Check cable jackets for abrasion where they pass through conduit. A spare on the shelf prevents a failed probe from becoming a multi-day outage. Oil AutoTech keeps ready-to-ship stock of critical Bently Nevada spares, with fast dispatch worldwide.
Compatibility and Integration
This probe belongs to the 3300 5 mm system family and pairs with Proximitor sensors and extension cables. System accuracy and interchangeability specifications apply only when the full system uses 3300 XL components calibrated to an AISI 4140 steel target. Using a different target material changes the calibration.
Selection Checklist
Before ordering, confirm the 9.0 m length suits your cable route, the 3/8-24 UNF thread matches your mounting, and the ClickLoc connector matches your extension cable. If you need hands-on technical selection help, contact Oil AutoTech today for pricing and availability.
Please verify current lifecycle status and availability with Oil AutoTech before ordering.
