Product Overview

The Bently Nevada 330105-02-12-10-12-00 is a specialized 8mm Reverse Mount Probe engineered for critical rotating machinery where traditional mounting is physically restricted. As a cornerstone of the 3300 XL series, this probe delivers high-fidelity displacement data for radial vibration, axial thrust, and speed measurements. It plays a decisive role in Turbine Supervisory Instrumentation (TSI), feeding precise eddy current signals to the 3500 Monitoring System to facilitate emergency shutdown (ESD) logic and predictive diagnostics. Designed to withstand the turbulent environments of centrifugal compressors and steam turbines, this reverse mount variant allows for secure installation from the interior of the bearing housing, ensuring the probe tip maintains a stable, linear relationship with the target shaft even under extreme thermal expansion.

Model Configuration Analysis

Suffix Breakdown for Reverse Mount Application

The specific coding of the 330105-02-12-10-12-00 defines its mechanical footprint and electrical termination:

Reverse Mount Housing Option (02): 3/8-24 UNF thread, optimized for standard reverse mount applications where the probe is secured within a sleeve or internal housing.

Overall Case Length (12): 1.2-inch total case length, providing a compact profile for confined bearing environments.

Total Length (10): 1.0 meter (3.3 feet) total cable length, requiring an extension cable to complete the 5.0m or 9.0m system calibration.

Connector Option (12): Miniature coaxial ClickLoc connector with fluid-resistant FEP cable insulation and protective silicone boot.

Agency Approval (00): No specific hazardous area approvals, suitable for general industrial or non-classified locations.

Comprehensive Performance Data

On-Site Setup & Gap Calibration

Reverse mount probes require careful mechanical zeroing since they are typically installed from the "inside-out." Engineering personnel must set the static "Gap Voltage" to -10.0 VDC using a high-impedance digital voltmeter to ensure the probe operates at the center of its linear range. Maintain a minimum cable bend radius of 25.4 mm (1.0 inch) to prevent internal coaxial dielectric failure. Ensure the probe tip remains 16 mm clear of any side-wall metal to avoid magnetic field distortion, which causes "cross-talk" and erroneous vibration readings. Verify all ClickLoc connectors are clean and dry before final assembly.

Strategic Maintenance Advantages

The 3300 XL Reverse Mount Probe provides unmatched resistance to "oil soak," preventing lubricant ingress from degrading the signal over years of continuous operation. It integrates seamlessly with Honeywell Experion PKS and Emerson DeltaV via the Bently Nevada 3500 rack, offering a robust buffered signal for System 1 diagnostic software. Its PPS (Polyphenylene Sulfide) tip is chemically inert and thermally stable, ensuring that the critical vibration data remains accurate during the rapid thermal cycles of large-scale power generation and petrochemical assets.

Ordering info

• Bently Nevada 330105-02-12-10-12-00 Reverse Mount Probe.

• Integrated 1.0m Coaxial Cable with ClickLoc Connector.

• One (1) Protective Silicone Connector Boot.

• Mounting Hardware (Internal Locknut).

• Individual Factory Calibration Certificate.

Global Logistics & Protective Handling

Delivery time: 2-7 days when payment finish. All high-precision sensors ship via DHL, FEDEX, or UPS with real-time tracking. We utilize premium anti-static industrial packaging and vacuum-sealed moisture barriers to ensure electrical integrity. The units are housed in double-walled, impact-resistant shipping containers with custom dunnage to protect the sensitive 8mm tip from mechanical shock during international transit.

Machinery Protection FAQ

Q1: Why choose a Reverse Mount (330105) over a Standard Mount (330103)?

A1: Reverse mount probes are essential when the bearing housing design prevents the probe from being gapped from the outside. The 330105 allows the probe to be threaded into a mounting bracket inside the housing and secured, often used in conjunction with a probe sleeve.

Q2: Can I use this 1.0m probe with an existing 9.0m Proximitor?

A2: No. You must use a 1.0m probe with an 8.0m extension cable to match a 9.0m system, or a 4.0m extension cable for a 5.0m system. The total electrical length must match the Proximitor calibration.

Q3: Does the "12" connector option provide better protection?

A3: Yes, the "12" option includes a silicone boot and often features enhanced fluid resistance, making it ideal for applications where the connector may be exposed to turbine oil or high humidity.

Q4: How do I identify a probe failure vs. a cable failure?

A4: Use a voltmeter to check the Proximitor output. A reading of 0V or -24V usually indicates an open or short circuit in the cable or probe. A stable voltage between -1V and -22V suggests the probe is functional but may be incorrectly gapped.