330101-00-71-05-01-05 | Bently Nevada | | Bently Nevada | 3300 XL 8 mm Probe

## Technical Overview

The Bently Nevada 330101-00-71-05-01-05 is a 3300 XL 8 mm proximity probe, engineered as the primary sensing component in an eddy current transducer system. It functions as a non-contacting transducer, measuring static and dynamic distances between the probe tip and a conductive target material. The system operates by generating a high-frequency radio frequency (RF) field from the probe coil. When this field interacts with the target surface, eddy currents are induced, altering the impedance of the system. The associated Proximitor Sensor conditions this signal into a precise DC voltage directly proportional to the gap distance.

This probe forms the front-end of a measurement channel for critical machinery parameters, including radial vibration, axial thrust position, and shaft speed. It integrates directly with the Bently Nevada 3500 Machinery Protection System, providing high-resolution data for condition monitoring, operational diagnostics, and automatic machine shutdown to protect high-value rotating assets.

## Detailed Specifications

| Parameter | Specification |
| :— | :— |
| Manufacturer | Bently Nevada |
| Part Number | 330101-00-71-05-01-05 |
| Product Type | 3300 XL 8 mm Proximity Probe |
| Total Length | 1.0 meter (3.3 ft) |
| Case Thread | 3/8-24 UNF |
| Connector Type | Miniature coaxial ClickLoc™ connector, standard cable |
| System Linear Range | 2 mm (80 mils) |
| System Sensitivity | 7.87 V/mm (200 mV/mil) ±6.5% |
| Probe Tip Material | Polyphenylenesulfide (PPS) |
| Probe Case Material | AISI 304 stainless steel |
| Operating Temperature | -34 °C to +177 °C (-29 °F to +350 °F) |

## Operational Capabilities

Designed for demanding industrial environments, the 3300 XL 8 mm probe delivers consistent and reliable measurements for machinery protection and condition monitoring programs.

In Oil & Gas applications, these probes monitor the health of critical assets such as centrifugal and reciprocating compressors, gas turbines, and process pumps. They provide the essential data needed to detect early signs of bearing wear, shaft imbalance, and fluid-induced instabilities. This capability enables predictive maintenance strategies, reduces unscheduled downtime, and prevents catastrophic equipment failures.

In Power Generation, the probes are integral to monitoring large steam and gas turbine-generator sets. They measure shaft vibration, casing expansion, differential expansion, and rotor axial position with high accuracy. The data supplied by these transducers ensures safe turbine startup, operation, and shutdown sequences, helping to maximize operational availability and extend the service life of the machinery.

## Technical FAQ

Is the 330101-00-71-05-01-05 probe compatible with other series of Proximitors or extension cables?

No. To ensure specified performance and accuracy, the 3300 XL 8 mm probe must be paired exclusively with a 3300 XL Proximitor Sensor and a 3300 XL extension cable. The entire transducer system—probe, cable, and Proximitor—is calibrated as a single unit. Mismatching components alters the system’s electrical characteristics (impedance and capacitance), leading to an incorrect scale factor and inaccurate, unreliable measurements. Always use components from the same transducer series for a given measurement point.

<p