Description
Bently Nevada 330876-03-50-00-00 | 3300 XL 50 mm Proximity Probe | Rotating Machinery Protection
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Bently Nevada |
| Model | 330876-03-50-00-00 |
| Product Family | 3300 XL 50 mm Proximity Probe |
| Product Type | Eddy-current proximity probe |
| Measurement Principle | Eddy-current / electromagnetic proximity measurement |
| Probe Family | 50 mm |
| Housing Configuration | -03, smooth side-exit housing |
| Housing Diameter | Approx. 1.99 in. |
| Cable Length | 5.0 m / 16.4 ft |
| Cable Configuration | -50 |
| Armor / FluidLoc Configuration | -00 |
| Agency Certification Suffix | -00 |
| Mounting | 1/4-20 UNC mounting holes |
| Typical System Role | Shaft vibration, radial/axial position and speed measurement |
| Compatible Electronics | 3300 XL Proximitor sensor system, subject to exact probe/electronics configuration |
The exact 330876-03-50-00-00 configuration is listed among Bently Nevada 3300 XL 50 mm proximity-probe part numbers. The 03 housing configuration is described as a smooth, approximately 1.99-inch-diameter side-exit housing, while the 50 code corresponds to a 5.0 m cable configuration.
Some third-party listings provide conflicting specifications for probe tip size, cable construction, operating temperature and output characteristics. Those figures should not be copied into a purchase specification without checking the probe’s OEM datasheet and the exact serial/revision configuration. In particular, 330876 is a probe assembly, not a 4–20 mA transmitter or standalone vibration monitor.
Product Introduction
The Bently Nevada 330876-03-50-00-00 is a 3300 XL 50 mm proximity probe used for non-contact measurement of rotating-shaft behavior. It forms the sensing portion of a Bently Nevada proximity transducer system, where the probe is installed close to the rotating target and paired with compatible Proximitor electronics. The resulting measurement can be used for shaft vibration, radial position, axial position or speed-related monitoring depending on the monitoring channel configuration.
The Bently Nevada 330876-03-50-00-00 is particularly relevant to machinery protection systems where the probe installation geometry is already established. The 5.0 m cable and side-exit housing are not cosmetic options; they affect routing, mounting clearance and replacement compatibility. For a brownfield turbine or compressor installation, matching the complete ordering code is normally safer than selecting another 3300 XL probe based only on the nominal 50 mm family designation.
330876-03-50-00-00
Application Scenarios & Field Pitfalls — The Engineer’s Perspective
Engineering Pain Point
With proximity probes, a replacement can look physically correct and still produce the wrong result if the probe configuration, cable length, target material, mounting geometry or associated Proximitor electronics do not match the original system. The 330876-03-50-00-00 should therefore be treated as one component of a calibrated measurement chain rather than as an independent vibration transmitter.
Typical Applications
- Steam and gas turbines — radial shaft vibration and shaft-position monitoring.
- Compressors — non-contact shaft displacement measurements on critical rotating assemblies.
- Large pumps and motors — bearing-area shaft vibration and position monitoring.
- Gearboxes and rotating machinery — condition-monitoring channels where proximity measurement is specified.
Technical Pitfalls to Avoid
1. Do not confuse the probe with the Proximitor sensor.
The 330876 is the field probe assembly. The associated Proximitor electronics provide the excitation and signal-conditioning functions required by the transducer system. Replacing one does not automatically replace the other.
2. Match the complete part number.
The “-03” and “-50” suffixes matter. The first identifies the housing configuration, while the second identifies the cable-length configuration. A 330876-03-90-00-00, for example, is not the same cable configuration as the requested 330876-03-50-00-00.
3. Check the mounting geometry before installation.
The documented 330876-03 configuration uses a side-exit housing and 1/4-20 UNC mounting holes. Cable exit direction and available clearance should be checked against the existing bracket before ordering a substitute.
4. Do not specify the probe using generic 4–20 mA terminology.
This is an eddy-current proximity probe. It belongs to a proximity transducer system and should not be treated like a conventional process transmitter.
5. Verify probe-to-Proximitor compatibility.
The probe, extension cable and Proximitor electronics form a matched measurement chain. A replacement probe should be checked against the installed electronics and system documentation rather than selected solely by physical dimensions.
6. Check cable routing and environmental exposure.
The 5 m cable configuration can be significant in turbine and compressor installations. Avoid introducing unnecessary extensions, sharp bends or routing changes that alter the original installation arrangement.
7. Be careful with online replacement work.
A proximity probe is part of a machinery protection measurement channel. Before removing an installed probe, follow the plant’s machinery-protection bypass, trip-inhibit and electrical isolation procedures. Probe replacement should not be treated as ordinary instrumentation maintenance when the channel participates in an overspeed, vibration trip or shutdown function.
Related Products
- 3300 XL 50 mm Proximity Probe — same probe family with different housing, cable and certification configurations.
- 330876-03-90-00-00 — same 03 housing configuration with a 9.0 m cable rather than the requested 5.0 m configuration.
- 330876-02-50-00-00 — 3300 XL 50 mm probe configuration using a different housing option.
- 330876-03-10-00-00 — same general probe family with a different cable-length configuration.
- 330876-03-50-00-05 — related 3300 XL 50 mm configuration with a different final suffix.
- 3300 XL Proximitor Sensor — compatible signal-conditioning component selected according to the installed transducer configuration.
- 3300 XL 25 mm Proximity Probe — smaller probe family for installations where the 50 mm probe configuration is not applicable.
- 3500/40M Proximitor Seismic Monitor — machinery monitoring hardware that can be used in applicable Bently Nevada monitoring architectures, subject to transducer compatibility.
- 3500/42M Proximitor/Seismic Monitor — four-channel monitoring platform for applicable proximity and seismic measurements.
Procurement Note
For Bently Nevada 330876-03-50-00-00, the most important purchasing information is the complete ordering code, not simply “3300 XL 50 mm.” Confirm the side-exit housing, 5.0 m cable configuration, final suffixes and compatibility with the installed Proximitor electronics.
For a brownfield turbine or compressor installation, I would also compare the old probe’s nameplate, cable routing, mounting arrangement and associated Proximitor part number before approving a substitute. A physically similar 3300 XL probe can still be the wrong spare if its mechanical configuration or transducer-chain specification differs.
