Product Overview

The Bently Nevada 330101-00-25-20-12-05 is a premier 8mm proximity probe within the 3300 XL transducer family, specifically engineered for the high-resolution monitoring of radial vibration and axial position. This probe serves as the fundamental sensing element for critical rotating assets, including gas turbines, steam turbines, and centrifugal compressors. By utilizing non-contact eddy current technology, the probe delivers ultra-precise displacement data to Bently Nevada 3500 monitoring racks and integrated DCS platforms. Its ability to function with sub-micron accuracy allows operators to detect early-stage shaft instabilities and mechanical wear, facilitating proactive maintenance and preventing catastrophic machinery failure in high-stakes environments like power generation and petrochemical refining.

Suffix Configuration Analysis

Engineering Parameter Breakdown

The model number 330101-00-25-20-12-05 indicates specific mechanical and electrical configurations required for precise site integration.

Unthreaded Length (00): This suffix specifies a 0.0-inch unthreaded length, indicating the probe case is fully threaded for maximum mounting flexibility.

Overall Case Length (25): The case measures 2.5 inches (approx. 64mm), providing a compact profile for installation in standard bearing housings.

Total Length (20): This probe features a 2.0-meter (6.6 feet) total cable length, requiring careful matching with the appropriate extension cable to maintain the calibrated system length.

Connector and Cable Option (12): This indicates a standard coaxial cable with a miniature male click-lock connector and includes a factory-installed FluidLoc cable seal to prevent oil migration.

Agency Approval (05): This probe carries Multi-Approvals (ATEX, IECEx, CSA), certifying its safety for use in Zone 0, Zone 1, and Division 1 hazardous industrial locations.

Essential Technical Specifications

Field Installation Guidance

Mechanical Gapping and Voltage Verification

Successful installation hinges on establishing the correct electrical gap between the probe tip and the shaft surface. Technicians must utilize a digital multimeter to monitor the DC output voltage at the Proximitor Sensor. For a standard 3300 XL 8mm system, the probe should be gapped to -10.0 VDC (the midpoint of the linear range), which typically equates to a physical distance of 1.27 mm (50 mils). Avoid over-tightening the probe within the mounting bracket; hand-tighten first, then secure with the locking nut to prevent case deformation. Ensure the coaxial cable maintains a minimum bend radius of 25.4 mm (1.0 inch) to protect the signal integrity of the high-frequency carrier wave.

Operational Durability and Integration

The 330101-00-25-20-12-05 excels in extreme environments characterized by high thermal stress and corrosive lubricants. Its Polyphenylene Sulfide (PPS) tip resists chemical degradation, while the 304 stainless steel case ensures mechanical longevity within the bearing housing. This probe integrates seamlessly with Turbine Supervisory Instrumentation (TSI) suites and Honeywell Experion PKS, enabling advanced machinery diagnostics and automatic emergency shutdown (ESD) capabilities. By providing a stable, noise-immune signal, it reduces false-trip incidents and ensures that the protection system only intervenes during genuine mechanical hazards.

Delivery and Packaging Information

Delivery time: 3-5 days when payment finish, BY DHL/FEDEX/UPS.

We dispatch all Bently Nevada probes in factory-sealed, anti-static industrial packaging. This multi-layered protection prevents electrostatic discharge and shields the internal precision coils from mechanical shock during international transit to your facility.

Technical Support FAQ

Q1: What extension cable is required for this 2.0-meter probe?

A1: To complete a calibrated 5.0-meter system, you must pair this probe with a 3.0-meter extension cable. For a 9.0-meter system, pair it with a 7.0-meter extension cable.

Q2: Does the "12" suffix provide extra protection against oil?

A2: Yes, the "12" option includes the FluidLoc seal, which prevents lubrication oil from leaking through the cable's interior, a critical feature for high-pressure bearing applications.

Q3: Can this probe be used with a target material other than 4140 Steel?

A3: The probe is factory-calibrated for AISI 4140 steel. If your shaft uses a different alloy, you must apply a scale factor correction in your monitor configuration to account for differences in magnetic permeability.

Q4: Is the click-lock connector moisture-proof?

A4: While the connector provides a secure mechanical lock, we recommend using Fluorosilicone connector protectors or heat-shrink tubing in environments with high humidity or oil mist to ensure an airtight seal.