Product Overview

The Bently Nevada 330104-00-12-50-02-05 is a 3300 XL 8 mm proximity probe used for non-contact measurement of shaft vibration and relative displacement in rotating machinery. It uses eddy-current sensing to detect changes in the distance between the probe tip and a conductive target. When connected to a compatible extension cable and Proximitor sensor, it supplies the measurement signal used by machinery monitoring and protection equipment.

The 330104 model family uses an M10 × 1 metric mounting thread and an armored probe cable. In this particular ordering configuration, the code specifies a 120 mm case length, a 5-meter total probe cable length, a miniature coaxial ClickLoc connector without a connector protector, and a multiple-agency approval option. These details are important when selecting a replacement for an installed probe because mounting dimensions, cable construction, connector configuration, and certification requirements must match the application.

The 3300 XL 8 mm proximity transducer system has a nominal linear measurement range of 2 mm and a scale factor of 7.87 V/mm (200 mV/mil). It is commonly used to measure relative shaft vibration and position in machinery fitted with fluid-film bearings. The resulting measurements can help operators track changes in machine behavior and identify deviations from established operating conditions.

For example, a centrifugal compressor may use proximity probes near its bearing locations to measure shaft movement during startup, normal operation, and changes in process loading. The monitoring system evaluates the signals to identify changes in vibration amplitude or shaft position. Similar arrangements are used on steam turbines, generators, industrial pumps, and other rotating equipment.

The armored cable provides additional protection against abrasion and mechanical contact, which can be useful when the probe lead must pass through a confined machine installation. However, armor alone does not prevent every form of cable damage. Proper routing, connector handling, and protection from excessive bending or crushing remain necessary.

This probe is a sensing component rather than a standalone vibration monitor. Its electrical characteristics depend on the complete transducer arrangement, including the probe, extension cable, Proximitor sensor, and receiving monitoring channel. The 5-meter probe configuration must be paired with the corresponding 5-meter Proximitor system to maintain the intended measurement response.

Technical Specifications

Product Features

• 8 mm sensing tip: Supports non-contact shaft-displacement measurement within the 3300 XL 8 mm transducer system.
• M10 × 1 metric mounting thread: Fits compatible metric probe mounting provisions.
• 120 mm case configuration: Defines the probe body arrangement for mounting and adjustment.
• Armored cable construction: Adds mechanical protection against abrasion and contact with surrounding equipment.
• 5-meter cable configuration: Supports installations using the corresponding 5-meter transducer arrangement.
• ClickLoc connector: Provides a locking coaxial connection between the probe and the associated measurement circuit.
• Connector without protector: Matches the specified connector option for this ordering code.
• 2 mm nominal linear range: Supports displacement measurements within the specified linear operating region.
• 7.87 V/mm nominal scale factor: Establishes the expected output sensitivity of a compatible transducer system.
• Multiple-agency approval option: Specifies the CSA, ATEX, and IECEx approval configuration.
• Non-contact operation: Measures shaft movement without physical contact with the rotating target.
• Machinery monitoring integration: Supplies signals for compatible vibration and position monitoring equipment.

Working Principle

The 330104-00-12-50-02-05 measures the gap between its probe tip and a conductive target using eddy-current sensing. An alternating electromagnetic field interacts with the shaft surface, and changes in the gap alter the electrical response of the transducer circuit. A compatible Proximitor sensor converts this response into an output related to displacement.

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 conditioned output represents the relative movement between the shaft and the probe mounting point. The receiving monitoring channel processes the signal for vibration, position, or another configured measurement.

The nominal linear range of the 3300 XL 8 mm system is 2 mm, with a scale factor of 7.87 V/mm (200 mV/mil). These values describe the intended relationship between displacement and output voltage when the transducer components are correctly matched and operated within their specified range.

The initial probe gap must be set during installation. A correctly established operating point allows the system to measure shaft movement in both directions without leaving the linear region prematurely. If the probe is positioned too close to or too far from the shaft, the available measurement range may be reduced and the output may not represent displacement accurately.

The 5-meter cable configuration is an electrical system parameter, not merely a physical reach requirement. The probe is intended for use with the corresponding 5-meter Proximitor sensor arrangement. An incompatible extension cable or signal conditioner can change the transducer response even when the connectors appear to fit.

The armored lead helps protect the cable from mechanical damage, while the ClickLoc connector provides a locking electrical interface. The specified connector option does not include a connector protector, so installation and maintenance procedures should account for the exposed connection arrangement.

The probe measures shaft movement relative to its mounting point. If the mounting hardware loosens or the probe holder moves, the output may reflect movement of the sensing assembly as well as shaft displacement. Checking the mechanical installation and the complete electrical circuit is therefore important when readings become unstable.

Role in a 3300 XL Machinery Monitoring System

The Bently Nevada 330104-00-12-50-02-05 supplies the local shaft-displacement signal used by a compatible 3300 XL monitoring arrangement. It is installed near the designated measurement point and connected to the corresponding 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 machine accepts the specified M10 × 1 thread and accommodates the 120 mm case configuration.
2. Inspect the target surface: Ensure that the shaft surface is conductive and suitable for eddy-current proximity measurement.
3. Check the measurement location: Position the probe at the designated point and align it with the intended shaft surface.
4. Set the initial probe gap: Establish the operating gap according to the applicable 3300 XL 8 mm installation procedure and monitoring-channel requirements.
5. Secure the mounting hardware: Tighten the probe and locking arrangement according to the applicable instructions to prevent unwanted movement during operation.
6. Inspect the armored cable: Check the armor and outer jacket for crushing, abrasion, sharp bends, or other mechanical damage.
7. Route the cable correctly: Maintain the specified bend radius and avoid excessive tension, crushing, and contact with moving machinery.
8. Connect the extension cable: Use a compatible 3300 XL 8 mm extension cable suitable for the complete 5-meter system configuration.
9. Secure the ClickLoc connector: Confirm that the connector is correctly engaged and locked, taking care to protect the exposed connection because this configuration does not include a connector protector.
10. Verify the transducer arrangement: Confirm that the Proximitor sensor and monitoring channel are compatible with the 3300 XL 8 mm system and its specified cable configuration.
11. Establish baseline readings: Record initial shaft-vibration or position measurements under known operating conditions for future comparison.
12. Investigate abnormal measurements: Check the probe gap, mounting security, cable condition, connector engagement, extension cable, and Proximitor sensor before attributing unusual readings to a mechanical fault.

Related Components

Recommended Related Models

Key Advantages

• Measures shaft displacement without contact with the rotating target.
• Uses an 8 mm sensing tip and a nominal 2 mm linear measurement range.
• Provides an M10 × 1 metric mounting thread.
• Incorporates armored cable for additional mechanical protection.
• Supports a compatible 5-meter 3300 XL 8 mm transducer arrangement.
• Specifies the CSA, ATEX, and IECEx approval option.
• Integrates with compatible extension cables, Proximitor sensors, and machinery monitoring equipment.

Technical FAQs

Why is the 330104 model family suitable for metric mounting installations?

The 330104 family uses an M10 × 1 mounting thread, allowing it to fit compatible metric probe holders. The mounting thread, case configuration, and available adjustment must still be checked against the installed machine before replacement.

What is the significance of the 120 mm case-length option?

The case-length option defines the probe body configuration and affects how the sensing tip can be positioned relative to the shaft. The mounting arrangement must allow the specified gap to be established while maintaining secure thread engagement.

Why must a 5-meter probe use a compatible 5-meter Proximitor arrangement?

The probe cable and associated transducer components form an electrical measurement circuit with defined characteristics. Matching the probe to the intended 5-meter system helps maintain the specified sensitivity and measurement response.

What does the CSA, ATEX, and IECEx approval option mean for installation?

The approval option identifies a configuration associated with these certification schemes. The suitability of the probe for a particular hazardous area depends on the applicable certification conditions and the complete installed system, not just the probe ordering code. The equipment selection and installation must follow the site’s area classification and relevant requirements.