Product Overview

The Bently Nevada 330704-000-060-90-02-00 3300 XL 11mm Proximity Probe represents the advanced solution for non-contacting displacement monitoring in heavy-duty industrial rotating machinery. This 11mm sensor specifically targets applications requiring an extended linear range of 4.0 mm (160 mils), providing critical data for axial thrust and radial vibration monitoring where standard 8mm probes reach their physical limits.

Designed for the most demanding Turbine Supervisory Instrumentation (TSI) environments, this probe maintains exceptional signal stability in high-pressure and high-temperature scenarios. Its reverse-mount architecture allows for specialized installation through the machine housing, feeding precise analog signals to Bently Nevada 3500 series racks. By implementing this high-precision sensor, plant engineers secure the necessary data fidelity to prevent catastrophic failures in utility-scale steam turbines and large centrifugal compressors.

Technical Suffix Interpretation

330704-000-060-90-02-00 Configuration Decoding

The specific alphanumeric sequence for this 11mm probe defines its physical mounting profile, electrical length, and regulatory status.

Unthreaded Length (-000)

This indicates a 0.0 mm unthreaded length. For this reverse-mount model, the lack of an unthreaded section ensures the probe can be seated flush against the mounting sleeve or internal bracket for maximum mechanical stability.

Overall Case Length (-060)

The 060 suffix designates a 60 mm total case length. This dimension is optimized for specific bearing housing depths, ensuring the probe tip reaches the target shaft while maintaining a compact rear profile for clearance.

Total Length (-90)

This specifies a total cable length of 9.0 meters. The 9.0m configuration eliminates the need for a separate extension cable in many installations, providing a direct, high-integrity signal path from the machine to the Proximitor sensor located in a nearby junction box.

Connector Option (-02)

This unit features a miniature coaxial connector with a factory-installed connector protector. The protector provides essential shielding against moisture, oil, and dust at the electrical junction, preventing signal degradation.

Agency Approval (-00)

The 00 suffix indicates no specific agency approvals (Standard). This version is typically utilized in non-hazardous areas or internal testing environments where specific ATEX/Ex certifications are not mandatory.

Technical Specifications

Precision Installation Directives

Gap Voltage Commissioning

For 11mm systems, the nominal center of the linear range corresponds to a quiescent gap voltage of -10.00 VDC. Technicians must use a calibrated multimeter at the Proximitor output during installation to ensure the probe remains centered within its 160-mil range, allowing for maximum shaft excursion without signal clipping.

Mechanical Handling and Routing

Observe a strict minimum bend radius of 25.4 mm (1.0 inch) for the 9.0-meter integral cable. Never kink or pinch the coaxial lead, as mechanical damage to the shield or center conductor permanently alters the system's resonant frequency, leading to inaccurate vibration readings in the DCS.

Target Surface Requirements

The 11mm probe tip requires a larger target area compared to 8mm models. Ensure the shaft target surface is at least 30.5 mm (1.2 inches) in diameter. Inadequate target size will introduce "side-viewing" errors and non-linearities into the machinery protection system.

Core Engineering Performance

Extreme Resilience in TSI Applications

The probe utilizes advanced polyphenylene sulfide (PPS) tip material, ensuring superior resistance to corrosive lubricants and chemical degradation. This material choice prevents tip swelling during high-temperature operation, maintaining a stable DC gap even during the machine's thermal expansion phases.

Seamless Integration and Synergy

This probe acts as the primary sensory input for modern condition monitoring platforms. It integrates flawlessly with Honeywell Experion PKS or Siemens PCS7 systems via the Bently Nevada 3500 rack, facilitating high-speed data acquisition for System 1 diagnostic software.

High-Pressure Integrity

The reverse-mount housing and internal seals are designed to withstand the high-pressure environments of large-scale turbine bearing housings. This prevents oil leakage and maintains the environmental seal of the machine while delivering continuous monitoring data.

Global Delivery & Fulfillment

Fast-Track Logistics

We guarantee shipping within 2-7 days when payment finish. All international orders utilize premium air freight via DHL, FEDEX, or UPS, providing door-to-door tracking to ensure critical outages are not delayed by supply chain friction.

Industrial-Grade Protection

Every 330704 probe is dispatched in New Original Pack condition. We utilize vacuum-sealed moisture barriers and reinforced anti-static industrial packaging to protect the precision-machined 11mm tip and the 9.0m coaxial lead during transcontinental transit.

Technical Maintenance FAQs

Q1: Why choose a 9.0m probe length (-90 suffix) over a standard 1.0m probe?

A1: The 9.0m cable allows for a "direct-connect" setup where the Proximitor sensor is mounted in a remote junction box without needing an additional extension cable. This reduces the number of connector junctions, which are potential points of failure or signal noise.

Q2: Can I use this probe with an 8mm Proximitor?

A2: No. The 11mm probe and 8mm probe have different sensing coil impedances and resonant frequencies. Using an 8mm Proximitor with an 11mm probe will result in a 50% scale factor error and a non-linear signal.

Q3: How do I verify the health of a 9.0m probe cable in the field?

A3: Measure the DC resistance between the center pin and the outer shell. For a healthy 3300 XL 11mm probe, the resistance should be between 5.0 and 15.0 ohms. An open circuit or a reading above 20 ohms indicates a broken lead or damaged coil.

Q4: Is the 330704 compatible with older 7200 series systems?

A4: While physically similar, the 3300 XL 11mm system offers superior temperature stability and performance. It is recommended to upgrade the entire transducer chain to 3300 XL to maintain accuracy and system reliability.