Product Overview
Downtime on a turbine train rarely waits for a purchase order. The Bently Nevada 146054-08-20-01-05 is a 3300 Ceramic Capped Proximity Probe built for radial vibration and axial position measurement on rotating machinery. This 3/8-24 UNF threaded probe uses an alumina ceramic (Al2O3) tip and an AISI 304 stainless steel case, so it stands up to the harsh conditions found on compressors, steam turbines and pumps in oil, gas and power plants.
This exact configuration ships with a 2.0 m (6.6 ft) total length, a miniature coaxial ClickLoc connector with connector protector, and CSA, ATEX and IECEx agency approvals. Oil AutoTech keeps fast-dispatch spares for oil, gas and industrial automation teams, so you can replace a failed probe without a long lead-time gamble.
Technical Specifications
Every value below comes directly from Bently Nevada documentation for this model. Use the table to confirm the configuration matches your machine before you order.
| Specification | Value |
|---|---|
| Model | 3300 Ceramic Capped Proximity Probe |
| Part Number | 146054-08-20-01-05 |
| Probe Case Thread | 3/8-24 UNF, without armor |
| Overall Case Length | 0.8 in |
| Total Length | 2.0 m (6.6 ft) |
| Connector Type | Miniature coaxial ClickLoc with connector protector |
| Agency Approval | CSA, ATEX, IECEx |
| Probe Tip Material | Alumina ceramic (Al2O3) |
| Probe Case Material | AISI 304 stainless steel |
| Probe Cable | 75 Ω coaxial, FEP insulated |
| Operating/Storage Temperature | -51°C to +177°C (-60°F to +351°F) |
| Pressure Rating | Seals 34 Bar (500 psi) nitrogen |
| Nominal DC Resistance | 7.88 ± 0.50 ohms |
| Linear Range | 1.52 mm (60 mils) |
| Incremental Scale Factor | 7.87 V/mm (200 mV/mil) ±6.5% |
What the Key Numbers Mean
The 7.88 ohm center-to-outer conductor resistance is a quick health check: a reading far outside ±0.50 ohms points to cable damage or moisture ingress. The 1.52 mm linear range and 7.87 V/mm scale factor tell you this probe pairs with a 3300 5 mm system to deliver a predictable -4 to -16 Vdc signal over the measuring window. The ceramic cap resists abrasion and chemical attack better than a plain plastic tip, which matters when the probe sits close to a bearing housing for years.
Comparison: 146054-08-20-01-05 vs. Other 3300 Probe Options
| Feature | 146054-08-20-01-05 | Armored 3300 probe | Standard plastic-tip probe |
|---|---|---|---|
| Tip material | Alumina ceramic (Al2O3) | Alumina ceramic | Plastic |
| Case thread | 3/8-24 UNF | 3/8-24 UNF | Varies |
| Armor | Without armor | With armor | Without armor |
| Total length | 2.0 m | Varies | Varies |
| Connector | Miniature coaxial ClickLoc | ClickLoc or other | Varies |
| Agency approval | CSA, ATEX, IECEx | Varies | Varies |
Choose the unarmored ceramic probe when the cable route is protected and you want a smaller bend radius. Choose an armored version only if the cable run is exposed to mechanical abuse. The ceramic tip is the differentiator when chemical resistance and wear life drive the decision.
Where This Probe Fits
Steam turbine radial vibration. The 2.0 m cable reaches a Proximitor Sensor mounted in a nearby junction box, and the -51°C to +177°C range covers the ambient swings around a turbine deck.
Compressor axial position. The 34 Bar (500 psi) pressure seal and ceramic tip suit high-pressure casing penetrations where a plastic-tip probe would wear quickly.
Pump monitoring in hazardous areas. CSA, ATEX and IECEx approvals let you install this probe in classified zones without a separate approval project.
Installation and Maintenance Notes
Mount the probe through a 3/8-24 UNF threaded hole and set the gap so the probe face sits inside the 1.52 mm linear range. Keep the ClickLoc connector dry and fully seated; moisture at the connector is the most common cause of a drifting signal. Inspect the ceramic tip and cable jacket during planned outages, and verify the nominal DC resistance with the cable disconnected. If the reading moves outside 7.88 ± 0.50 ohms, replace the probe rather than trying to repair it.
Integration Note
This probe is one part of a 3300 5 mm system. It works with a Proximitor Sensor, extension cable and monitor that match the 3300 series. If you are wiring into a plant network or a different monitoring platform, confirm the required cables, gateways or connection modules with your supplier before installation.
Selection Checklist
Before you buy, confirm the thread (3/8-24 UNF), total length (2.0 m), connector type (miniature coaxial ClickLoc) and agency approval (CSA, ATEX, IECEx) match your machine record. Oil AutoTech offers hands-on technical selection help and quick worldwide delivery, so a quick call can prevent a wrong-part return. Contact Oil AutoTech today for pricing and availability.
Please verify current lifecycle status and availability with Oil AutoTech before ordering.
