Product Overview

The Bently Nevada 330102-00-28-50-02-CN is a 3300 XL 8 mm proximity probe used to measure shaft vibration and relative displacement in rotating machinery. It operates through eddy-current sensing, detecting changes in the gap between the probe tip and a conductive target. When connected to a compatible extension cable and Proximitor sensor, it forms part of a transducer system used for continuous machinery monitoring.

This model belongs to the 330102 configuration, which uses a 3/8-24 UNF mounting thread and an armored probe cable. The ordering code specifies a 2.8-inch case length and a 5-meter integral cable. The armored construction helps protect the cable against mechanical contact and abrasion in installations where the probe lead passes through confined machinery spaces or near other equipment.

The 3300 XL 8 mm system has a nominal linear measurement range of 2 mm and a scale factor of 7.87 V/mm (200 mV/mil). These characteristics support measurements of relative shaft vibration, shaft position, and other displacement-related parameters within the system’s specified operating range. The actual measurement performance depends on the complete transducer configuration and the target surface.

In a centrifugal compressor, probes installed near bearing locations measure shaft movement while the machine operates at different speeds and loads. The monitoring system evaluates the resulting signals to establish vibration trends and identify deviations from normal operating behavior. Similar arrangements are used on turbines, pumps, generators, and other rotating equipment with suitable bearing and shaft configurations.

The probe is a sensing component rather than a standalone vibration monitor. Its output must be processed by compatible signal-conditioning equipment before it can be interpreted as a displacement measurement. The monitoring system can then use the signal for display, trending, alarm processing, and machinery protection functions.

The 5-meter probe configuration is intended for use with the corresponding 5-meter 3300 XL system arrangement. The probe, extension cable, and Proximitor sensor must be selected as a compatible combination to maintain the specified electrical response. The armored cable provides mechanical protection, but it does not replace the need for correct cable routing, secure mounting, and proper connector installation.

Technical Specifications

Product Features

• 8 mm sensing tip: Supports non-contact displacement measurements in the 3300 XL 8 mm transducer system.
• Armored probe cable: Provides additional mechanical protection for the cable in demanding installation environments.
• 3/8-24 UNF mounting thread: Fits compatible threaded probe mounting provisions.
• 2.8-inch case length: Defines the specified threaded probe body configuration.
• 5-meter integral cable: Forms part of the intended 5-meter transducer system.
• 2 mm linear measurement range: Supports displacement measurement within the specified linear operating region.
• 7.87 V/mm nominal scale factor: Establishes the standard output sensitivity for the compatible 5-meter system.
• ClickLoc connector: Uses a locking connector design intended to resist loosening during operation.
• Non-contact measurement: Detects shaft movement without physical contact with the rotating target.
• Machinery monitoring integration: Supplies a signal for compatible vibration and position monitoring channels.
• Corrosion-resistant connector materials: Supports electrical connection integrity in the intended installation.
• Matched transducer architecture: Works with compatible extension cables and Proximitor sensors as part of a complete measurement circuit.

Working Principle

The 330102-00-28-50-02-CN uses eddy-current sensing to detect changes in the distance between its probe tip and a conductive shaft surface. The probe operates as part of an energized transducer circuit. Its electromagnetic field interacts with the target, and changes in the probe-to-target gap alter the circuit’s electrical response.

Rotating Shaft → 3300 XL 8 mm Probe → Extension Cable → Proximitor Sensor → Monitoring Channel

When the shaft moves toward or away from the probe, the gap changes. The Proximitor sensor converts the resulting electrical response into an output related to displacement. The monitoring channel processes that output to obtain vibration or position information according to its configured measurement function.

The nominal linear range is 2 mm, with a scale factor of 7.87 V/mm. Within the specified operating region, changes in output voltage correspond to changes in the measured gap. For radial vibration monitoring, the recommended gap setting is approximately 1.27 mm, corresponding to a Proximitor output near -9 V DC under the specified system conditions.

The probe’s cable length is part of the electrical design. The 5-meter integral cable is intended for use with the corresponding 5-meter system arrangement, and the extension cable and Proximitor sensor must be compatible with that configuration. Substituting components with different electrical characteristics can affect measurement sensitivity and system response.

The armored cable provides additional protection against mechanical damage. Its routing still needs to respect the minimum bend radius and avoid excessive pulling force, crushing, and contact with sharp edges. The cable and connector should remain secure during machine operation.

The probe measures movement relative to its mounting point. Consequently, a loose mounting bracket or movement of the surrounding structure can influence the recorded signal. Correct installation and a stable mounting arrangement are essential for distinguishing actual shaft displacement from unwanted movement of the measurement hardware.

Role in a 3300 XL Machinery Monitoring System

The 330102-00-28-50-02-CN supplies the local shaft-displacement signal used by a compatible 3300 XL monitoring system. It is installed near the designated shaft measurement location and connected to a compatible extension cable and Proximitor sensor.

Shaft Surface → 3300 XL 8 mm Probe → Extension Cable → Proximitor Sensor → Monitoring Module → Operator Interface

Industrial Applications

Installation and Maintenance

1. Confirm the mounting provision: Verify that the installation accommodates the specified 3/8-24 UNF-2A probe thread and 2.8-inch case length.
2. Inspect the target surface: Ensure that the shaft surface is conductive and suitable for eddy-current displacement measurement.
3. Check the probe location: Position the probe at the designated measurement point and align it with the intended shaft surface.
4. Set the initial probe gap: Establish the gap using the applicable 3300 XL installation procedure and the requirements of the receiving monitoring channel.
5. Secure the mounting hardware: Tighten the probe and locking arrangement according to the applicable installation requirements to prevent movement during machine operation.
6. Inspect the armored cable: Check the armor, outer jacket, and exposed cable sections for damage, crushing, or excessive bending.
7. Route the cable correctly: Maintain the specified minimum bend radius and avoid pulling or clamping forces that could damage the cable or probe connection.
8. Connect the extension cable: Use a compatible 3300 XL 8 mm extension cable appropriate for the 5-meter system configuration.
9. Secure the ClickLoc connector: Ensure that the connector is correctly engaged and locked without applying excessive force.
10. Verify the Proximitor output: Check that the transducer output corresponds to the established probe gap and the monitoring channel’s configuration.
11. Establish baseline measurements: Record the initial vibration or position readings under known operating conditions for future comparison.
12. Review abnormal readings: Inspect the mounting, cable, connectors, probe gap, and complete transducer circuit if the monitoring system reports unstable or unexpected values.

Related Components

Recommended Related Models

Key Advantages

• Provides non-contact shaft-displacement measurement for rotating machinery.
• Uses an 8 mm sensing tip and a nominal 2 mm linear measurement range.
• Incorporates an armored cable for additional mechanical protection.
• Uses a 3/8-24 UNF mounting thread.
• Supports a compatible 5-meter 3300 XL 8 mm transducer system.
• Supplies measurement signals for vibration and position monitoring.

Technical FAQs

Why is the 330102 configuration supplied with an armored cable?

The 330102 probe configuration includes cable armor to provide additional mechanical protection in installations where the cable may be exposed to abrasion or contact with surrounding equipment. The armor does not remove the need for proper cable routing and bend-radius control.

What does the 2.8-inch case-length option determine?

The case-length option defines the specified probe body length used in the mounting arrangement. It affects how the probe fits into the available threaded mounting provision and how the sensing tip can be positioned relative to the shaft.

Why must the 5-meter probe be paired with a compatible transducer system?

The probe cable length forms part of the electrical characteristics of the complete proximity measurement circuit. Using a compatible 5-meter extension cable and Proximitor sensor maintains the intended system response and measurement sensitivity.

Can this probe measure both shaft vibration and shaft position?

Yes. When integrated with a compatible 3300 XL 8 mm transducer system, the probe can provide displacement-related signals for dynamic shaft vibration or static relative-position measurements. The monitoring channel configuration determines how the signal is processed and displayed.