Product Overview

The Bently Nevada 330704-00-50-10-01-05 is a rugged, high-performance 11mm proximity sensor specifically engineered for applications requiring a wider linear range than standard 8mm probes. It serves as a critical diagnostic tool for large-scale rotating machinery, primarily used for axial thrust position and radial vibration monitoring. By utilizing the eddy current principle, this sensor provides non-contacting, high-resolution measurements of shaft motion. Its robust 11mm tip offers a superior linear range of 4.0 mm (160 mils), making it the preferred choice for massive turbines and compressors where larger shaft movements or increased gaps are expected. Integrating this sensor into your Bently Nevada 3500 system ensures maximum protection against machine damage, reducing unplanned downtime through precise asset condition monitoring.

Model Postfix Logic & Engineering Code

The detailed configuration of the 330704 series dictates its mechanical fit and electrical output. The specific suffixes for this model are decoded as follows:

00 - Unthreaded Length

Specifies a 0.0-inch unthreaded length. The entire barrel of the probe is threaded, allowing for maximum flexibility when adjusting the gap within a threaded mounting port or bracket.

50 - Case Length

Represents a 5.0-inch overall case length. This dimension ensures the probe can penetrate deep machine housings while leaving sufficient space for the connector assembly.

10 - Total Length

Indicates a 1.0-meter (3.3 feet) integral cable length. This cable is calibrated for low-loss signal transmission and must be paired with the appropriate extension cable to reach the Proximitor.

01 - Connector Option

Features a miniature coaxial connector with a connector protector. This ensures the electrical junction remains isolated from contaminants like oil and moisture.

05 - Agency Approval

Corresponds to Multiple Approvals (including CSA, ATEX, and IECEx). This configuration is certified for use in hazardous areas where explosive atmospheres may be present.

Hardware Matrix

Field Commissioning Protocol

During field installation, the probe must be precisely gapped to ensure it operates within its calibrated linear region. For the 11mm system, the nominal "Gap Voltage" at the center of the 160-mil range is typically -10.0 VDC. We strongly recommend using a Bently Nevada TK-3 or equivalent wobbulator for field verification. When routing the integral cable, maintain a minimum bend radius of 25.4 mm (1.0 inch) to prevent internal core damage. Ensure the probe tip is perpendicular to the shaft target area; any deviation greater than 5 degrees can result in scale factor errors.

Reliability & Industrial Compatibility

The 330704 series excels in high-pressure environments where chemical and thermal resilience are paramount. Its polyphenylene sulfide (PPS) tip resists degradation from synthetic lubricants and caustic process fluids. This sensor is designed for seamless integration with the Bently Nevada 3500/45 Position Monitor, providing real-time data to your DCS or PLC via Modbus or OPC UA protocols. The 11mm probe's larger surface area provides a more stable average reading on shafts with minor surface imperfections, enhancing overall signal-to-noise ratios in heavy industrial service.

Global Logistics & Fulfillment

We specialize in the rapid supply of critical automation components.

Shipping Window: 2-7 days when payment finish through our express logistics network.

Global Carriers: Direct dispatch via DHL, FEDEX, or UPS for real-time tracking.

Packaging Excellence: All sensors are shipped in specialized anti-static industrial packaging. We use reinforced, moisture-sealed containers to guarantee the product arrives in factory-sealed condition, ready for immediate installation.

Site Engineer FAQs

Q1: Why use an 11mm probe instead of an 8mm probe?

A1: The 11mm probe offers double the linear range (160 mils vs 80 mils). This is essential for thrust position monitoring on large turbines where shaft axial movement exceeds the limits of standard 8mm sensors.

Q2: Can I splice the integral cable if it's too long?

A2: Absolutely not. The cable length is part of a tuned circuit. Cutting or splicing the cable will change its impedance and render the vibration or position readings inaccurate.

Q3: What does the -05 approval option cover?

A3: The -05 suffix provides comprehensive hazardous area certifications, including ATEX/IECEx for Zone 0, 1, and 2, making it suitable for global oil and gas applications.

Q4: Is this sensor compatible with 3300 XL extension cables?

A4: Yes, but you must ensure the total system length (Probe + Extension Cable) matches the calibration of the 3300 XL 11mm Proximitor (typically 5m or 9m).