330102-00-20-50-02-00 | Bently Nevada | 3300 XL 8 mm Proximity Probes

Product Overview

The 330102-00-20-50-02-00 is a premier eddy current displacement sensor within the Bently Nevada 3300 XL series, designed for non-contacting vibration and position measurements. In mission-critical environments such as gas turbine power plants, petrochemical refineries, and mining facilities, this 330102-00-20-50-02-00 probe acts as the primary sensory input for Machinery Protection Systems (MPS). By monitoring radial vibration, shaft alignment, and axial thrust with micron-level precision, it provides early warning of mechanical wear or impending failure. This specific configuration features a fully armored cable and a 3/8-24 UNF threaded body, ensuring durability in high-stress industrial applications where mechanical protection and signal integrity are paramount for avoiding catastrophic unplanned downtime.

Suffix Breakdown

The alphanumeric string of the 330102-00-20-50-02-00 defines its physical and electrical characteristics as follows:

• 330102: Base model for the 3300 XL 8 mm Proximity Probe with 3/8-24 UNF threading.

• -00 (Unthreaded Length): Specifies that the probe body is fully threaded (0 inches unthreaded).

• -20 (Overall Case Length): Indicates a total case length of 2.0 inches, allowing for shallow to mid-depth installation.

• -50 (Total Length): Sets the total electrical length at 5.0 meters (16.4 feet), integrated for standard Proximitor calibrations.

• -02 (Connector/Cable): Equipped with a Miniature coaxial ClickLoc connector and a standard cable featuring protective armor.

• -00 (Agency Approval): Standard version without specific hazardous area agency approvals.

Technical Specifications

Hardware Insights & FAQs

Is this 5.0-meter probe compatible with a 9.0-meter Proximitor?

No. The total electrical length of the probe and any extension cable must match the specific calibration of the Proximitor Sensor. Using a 5.0-meter probe with a 9.0-meter Proximitor will cause a "Scale Factor" error, resulting in incorrect vibration readings.

What are the benefits of the ClickLoc connector?

The ClickLoc connector on the 330102-00-20-50-02-00 provides a secure, vibration-resistant connection. It is designed to prevent accidental disconnection and requires no special tools for mating, ensuring reliable signal transmission in high-vibration machine casings.

Can this probe withstand exposure to turbine oil?

Yes. The 3300 XL probes are manufactured with materials highly resistant to most industrial lubricants and solvents. The gold-plated contacts and Ryton tip ensure long-term stability even in the chemically aggressive environments found in steam and gas turbines.

Engineering & Installation Guide

Gap Voltage Setting

For a standard 3300 XL 8 mm system, the probe must be "gapped" to the midpoint of its linear range. Connect a voltmeter to the Proximitor "OUT" and "COM" terminals and adjust the probe position until the DC voltage reads -10.0 VDC. This ensures the probe has equal headroom to measure both positive and negative vibration peaks.

Connector Protection and Torque

When installing the 330102-00-20-50-02-00, do not over-torque the probe into the mounting bracket. Use a calibrated torque wrench and follow Bently Nevada's guidelines (typically 5.1 N-m or 45 in-lb for 3/8-24 threads). Ensure the ClickLoc connector is clean and dry; if moisture is present, use a connector protector or specialized heat-shrink tubing to prevent signal drift.

Cable Management and Armor Grounding

The armored cable protects the inner coaxial line from physical crushing and abrasion. Ensure the armor is not used as a primary ground path; the system should be grounded at the Proximitor end only. Avoid routing the armored cable in parallel with high-voltage AC lines to prevent induced electromagnetic noise in the vibration signal.