Product Overview
Downtime in a turbine train rarely announces itself. It starts as a drifting vibration reading, then a trip, then lost production. The Bently Nevada 146054-08-90-00-00 is a 3300 ceramic capped proximity probe built to keep that signal honest. This unit uses a 3/8-24 UNF case thread, a 0.8 in case length, a 9.0 m total length, and ships without armor or connector. It is new and original in factory packing.
Key Parameters and Cost Impact
Every number below drives cost, either in installation time or measurement confidence.
| Parameter | Value | Cost or Efficiency Implication |
|---|---|---|
| Case thread | 3/8-24 UNF | Standard mounting, no adapter spend |
| Overall case length | 0.8 in | Fits tight housings, less machining |
| Total length | 9.0 m (29.5 ft) | Reaches junction boxes without extension cable |
| Probe tip material | Alumina ceramic (Al2O3) | Resists wear, fewer replacements |
| Case material | AISI 304 stainless steel | Handles harsh plant environments |
| Linear range | 1.52 mm (60 mils) | Stable readings across the measuring span |
| Incremental scale factor | 7.87 V/mm (200 mV/mil) ±6.5% | Predictable calibration, less rework |
| Probe temperature range | -51°C to +177°C | Works in hot and cold service |
| Pressure rating | 34 Bar (500 psi) nitrogen | Sealed against process gas |
| Nominal DC resistance | 9.87 ± 0.90 ohms | Quick health checks in the field |
The 9.0 m length is the standout cost saver. A shorter probe often forces an extension cable and an extra junction box, which adds material and labor. This probe reaches directly, cutting both.
Where It Fits
Oil and gas operators use this probe on compressor and turbine shafts where vibration must be tracked continuously. A 9.0 m run suits machines with distant terminal cabinets, avoiding cable joints that can degrade signal quality.
Power generation plants rely on the ceramic tip in steam turbine applications. Alumina ceramic resists the wear that shortens probe life, so maintenance intervals stretch and replacement spend drops.
Industrial automation teams use the 3300 probe on test stands and rotating equipment where repeatable displacement data matters. The 7.87 V/mm scale factor keeps readings consistent across the linear range.
Installation Notes
Mount the probe using the 3/8-24 UNF thread and confirm the maximum thread engagement of 0.563 in. Set the target gap so the probe operates within the 1.52 mm linear range, roughly 0.25 to 1.78 mm from the target. The probe ships without a connector, so plan the field wiring to match your existing system. Keep cable runs away from high-current conductors to protect signal integrity.
Maintenance and Reliability
Inspect the probe tip periodically for wear or deposits. The ceramic cap handles abrasion well, but physical damage still shortens service life. Check the nominal DC resistance from the center conductor to the outer conductor; a reading near 9.87 ohms confirms the probe is healthy. The 34 Bar pressure seal suits pressurized housings, and the -51°C to +177°C range covers most plant conditions. For higher-pressure needs, contact the factory about custom modifications.
Selection Checklist
Before ordering, confirm the thread size, total length, and connector requirement against your machine. This probe has no connector and no armor, so verify that your installation matches. If you need a different length or approval option, the ordering code 146054-AA-BB-CC-DD lets you specify. Oil AutoTech offers hands-on technical selection help and fast dispatch, worldwide, so you get spares when you need them.
Please verify current lifecycle status and availability with Oil AutoTech before ordering.
