Bently Nevada · PROXPAC XL
Bently Nevada 330881-28-05-050-03-02 PROXPAC XL Metric Proximity Transducer Assembly
Metric complete assembly with approved 3300 XL 8 mm probe
Product Description
330881-28-05-050-03-02 is a metric PROXPAC XL proximity-transducer assembly containing a 3300 XL 8 mm probe with Multiple Approvals and an enclosed Proximitor Sensor. The design removes the external extension cable normally used between probe and sensor.
Its mechanical fields specify a 50 mm standoff adapter, 50 mm probe penetration, one M20 fitting with two plugs and a 3/4-14 NPT outer-sleeve mounting thread. Field wiring connects from the protected sensor housing directly to the monitor.
The complete 330881-28-05-050-03-02 chain provides a 2 mm linear range with a recommended 1.27 mm working gap under standard 3300 XL 8 mm reference conditions.
Technical Specifications
| Technical Item | 330881-28-05-050-03-02 |
|---|---|
| Brand | Bently Nevada |
| Product Type | PROXPAC XL metric proximity assembly |
| Brand Country | United States |
| Probe | 28 — 3300 XL 8 mm with Multiple Approvals |
| Standoff Adapter | 50 mm |
| Probe Penetration | 50 mm |
| Fittings | 03 — one M20 fitting and two plugs |
| Mounting Thread | 02 — 3/4-14 NPT |
| Linear Range | 2 mm (80 mil) |
| Recommended Gap | 1.27 mm (50 mil) |
| Scale Factor | 7.87 V/mm (200 mV/mil) ±5% |
| Frequency Response | 0 to 10 kHz, +0/-3 dB |
| Housing Rating | Type 4X; IP66 |
| Field Wiring | Up to 305 m (1,000 ft) |
Integrated Monitoring Performance
The integrated 3300 XL 8 mm chain supplies both static gap and dynamic displacement signals. A radial installation supports shaft-vibration monitoring, while an axial installation can provide thrust-position information; a suitable keyway or projection can be used for phase reference or speed.
The enclosed Proximitor Sensor presents a 50 ohm output to the monitor. With field wiring up to 305 m, the frequency response remains 0 to 10 kHz within the stated +0/-3 dB range, so the channel can be located remotely without an external transducer housing.
Metric PROXPAC Mounting Procedure
Metric PROXPAC Mounting Procedure in practice
Prepare the 3/4-14 NPT machine interface, install the 50 mm standoff and verify that the 50 mm penetration gives the probe an unobstructed view of the target. Keep the probe tip separated from adjacent probes to control cross-talk.
Route monitor wiring through the single M20 fitting, seal both unused entries with the supplied plugs and close the Type 4X/IP66 housing without trapping cable. Set the 1.27 mm working gap from the live output, then confirm static and dynamic channel response.
Frequently Asked Questions
Why can 330881-28-05-050-03-02 remain at zero output even though field wiring reaches the housing?
Confirm power, shield and signal conductors at the monitor and check the enclosed Proximitor Sensor’s 50 ohm output path. Then verify the integrated 3300 XL 8 mm probe is connected and set near the 1.27 mm working gap.
How should moisture entry be handled when 330881-28-05-050-03-02 is installed outdoors or near washdown?
Inspect the cover gasket, M20 fitting and both unused-entry plugs, then reseal the enclosure before restoring power. Type 4X/IP66 performance depends on every entry being closed and the cable not carrying water into the housing.
What should be done if 330881-28-05-050-03-02 is installed but the probe gap cannot be adjusted into range?
Recheck the 50 mm standoff, 50 mm penetration and 3/4-14 NPT mounting position before changing the probe. Once the target is unobstructed, adjust from the live voltage toward the 1.27 mm reference gap and verify the full 2 mm range.
How can cross-talk be reduced when another proximity probe is mounted near 330881-28-05-050-03-02?
Increase physical separation between probe tips and keep signal wiring from sharing an unsuitable route with adjacent channels. After repositioning, verify both static gap and dynamic response independently to confirm the interference is removed.
What should be checked if 330881-28-05-050-03-02 works locally but becomes noisy with a long monitor cable?
Keep the field-wiring run within 305 m, use the intended shielded conductors and separate the route from power wiring. Verify grounding and terminations while confirming the channel still meets the 0 to 10 kHz response conditions.
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