Product Introduction
The Bently Nevada 330425-02-05 is a 3300 XL 8 mm Reverse Mount Proximity Probe (also known as a side‑view or right‑angle probe). It is designed for non‑contact measurement of vibration, displacement, and position on rotating machinery shafts where standard straight probes cannot be installed due to space constraints. The reverse mount configuration features a compact, 90° cable exit that allows the probe to be mounted in tight radial or axial clearances (e.g., inside bearing housings, between close‑coupled components). The -02 suffix typically indicates an integral cable length of 0.2 meters (7.9 inches), while -05 denotes hazardous area approvals (ATEX, CSA, IECEx Zone 0/1/2, gas and dust). The probe is fully compatible with 3300 XL Proximitors (e.g., 330180 series) and extension cables.
Parameters
| Parameter | Specification |
|---|---|
| Model / Part Number | 330425-02-05 |
| Product Type | 3300 XL 8 mm Reverse Mount Proximity Probe |
| Probe Tip Diameter | 8 mm (0.315 in) |
| Mounting Configuration | Reverse mount (90° cable exit, low‑profile head) |
| Integral Cable Length | 0.2 m (7.9 in) – option -02 |
| Connector Type (cable end) | Miniature coaxial male (Mini‑Type) for extension cable |
| Approval Code | -05 (ATEX, CSA, IECEx Zone 0, 1, 2; gas and dust) |
| Dimensions (probe head) | Length: 17.5 mm (0.69 in); Width: 12.7 mm (0.50 in); Height: 12.7 mm (0.50 in) (approx.) |
| Cable Outer Diameter | 3.5 mm (0.14 in) |
| Total Weight (probe + 0.2 m cable) | Approx. 0.06 kg (0.13 lb) |
| Linear Range | 2.0 mm (80 mils) |
| Operating Temperature (probe tip) | –35 °C to +120 °C (–31 °F to +248 °F) |
| Operating Temperature (cable) | –51 °C to +177 °C (–60 °F to +351 °F) |
| Material (housing) | 300 series stainless steel / PPS (tip) |
| Thread Size | 3/8‑24 UNF (but reverse mount may use special nut) |
| Output scaling (with 3300 XL Proximitor) | 7.87 V/mm (200 mV/mil) |
| Frequency response (system) | DC to 10 kHz |
Application Scenarios
Tight Radial Clearances – Installed inside bearing housings of small turbines, high‑speed compressors, or gearboxes where standard straight probes cannot fit because the casing depth is insufficient for the 45–80 mm case length.
Axial Position Monitoring in Narrow Slots – Measures thrust position on machines with limited axial space (e.g., integral gear compressors, overhung fans) where the probe must be inserted perpendicularly from the side.
Hazardous Area Installations – Used in refineries, chemical plants, and offshore platforms for vibration monitoring on pumps, compressors, and blowers where explosive atmospheres exist. The -05 approval ensures compliance.
Retrofit of Hard‑to‑Access Measurement Points – Replaces older 7200 series reverse mount probes (e.g., 21505 series) with improved 3300 XL linearity and temperature stability, while maintaining the same mounting footprint.
Keyphasor on Small Shafts with Limited Surrounding Space – Provides once‑per‑revolution reference signals on auxiliary machinery (e.g., lube oil pumps, cooling tower fans) where a standard probe would interfere with adjacent components.
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