330191-00-33-05-00 | Bently Nevada 3300 XL 8mm ETR Probe

Product Overview

When machine vibration threatens production uptime, the Bently Nevada 330191-00-33-05-00 delivers reliable, precise measurement. This 3300 XL 8 mm ETR probe is engineered for demanding rotating machinery applications. With a 3/8-24 UNF thread and a 0.5 meter (1.6 feet) total length, this probe offers a robust solution for your proximity sensing needs.

The 3300 XL series represents a significant advancement in eddy-current probe technology. The patented TipLoc molding method creates a stronger bond between the probe tip and body, while the CableLoc design provides 330 N (75 lbf) pull strength. These features ensure long-term stability and resistance to physical abuse, reducing the risk of measurement drift and premature failure.

Technical Specifications

Part Number: 330191-00-33-05-00

Model: 3300 XL 8 mm ETR Probe, 3/8-24 UNF thread, without armor

Total Length: 0.5 metre (1.6 feet)

Overall Case Length: 3.3 inches

Unthreaded Length: 0.0 inches (minimum)

Probe Tip Material: Polyphenylene sulfide (PPS)

Probe Case Material: AISI 303 or 304 stainless steel

Standard Cable: 75Ω triaxial, FEP insulated

Extended Temperature Cable: 75Ω triaxial, PFA insulated

Armor (optional): Flexible AISI 302/304 SST with FEP jacket

Tensile Strength: 330 N (75 lbf) probe case to lead; 270 N (60 lbf) at connectors

Connector Material: Gold-plated brass or beryllium copper

Maximum Connector Torque: 0.565 N•m (5 in•lbf)

Probe Case Thread: 3/8-24, max engagement 0.563 in

Weight: 323 g/m (11.4 oz)

Power Requirement: -17.5 Vdc to -26 Vdc (with nonincendive circuit), -23 Vdc to -26 Vdc with barriers

Sensitivity: Less than 2 mV change per volt change

Output Resistance: 50 Ω

Nominal Probe DC Resistance (0.5m): 7.45 ± 0.50 Ω

Industry Applications

This proximity probe excels in critical rotating equipment monitoring. Use it for:

Turbomachinery: Monitor shaft vibration and axial position in steam turbines, gas turbines, and compressors. The 8 mm probe size provides robust performance in tight clearances.

Pumps and Motors: Detect shaft displacement and bearing wear in industrial pumps and large electric motors, enabling predictive maintenance.

Generators: Ensure reliable operation of generators by continuously measuring rotor vibration and eccentricity.

The 3300 XL 8 mm probe's thicker encapsulation and larger case diameter offer superior resistance to physical damage compared to smaller probes. This robustness translates to fewer false readings and reduced downtime, directly improving your bottom line.

Installation & Setup Guidance

Proper installation is critical for accurate measurements. Follow these guidelines:

Thread Engagement: Ensure the 3/8-24 UNF thread engages at least 0.563 inches for secure mounting.

Torque: Apply no more than 0.565 N•m (5 in•lbf) to the connector to avoid damage.

Cable Routing: Avoid sharp bends and excessive strain on the cable. Use the optional armor for added protection in harsh environments.

Probe Gap: Set the initial gap according to the target material and the system's calibration. Refer to the Bently Nevada installation manual for exact values.

Sealing: The probe seals differential pressure with a Viton® O-ring. Ensure the O-ring is properly seated before installation.

Maintenance & Reliability

The 330191-00-33-05-00 is designed for long service life, but regular inspection is recommended:

Inspect Cable and Connectors: Check for cuts, abrasions, or corrosion. Gold-plated connectors resist degradation, but keep them clean and dry.

Verify Output: Periodically measure the output resistance (50 Ω) to ensure the probe is functioning correctly.

Check Mounting: Confirm the probe remains tightly secured and the gap has not drifted.

By following a simple maintenance routine, you can maximize the probe's lifespan and avoid unplanned shutdowns. This proactive approach reduces total cost of ownership.

Selection Guide & Purchasing Advice

Before ordering, verify the following:

Total Length: This model has a 0.5 metre cable. Ensure it reaches your extension cable or monitor.

Thread Type: Confirm your mounting hole matches the 3/8-24 UNF thread.

Armor Requirement: If your environment has high abrasion or chemical exposure, consider the optional armor (not included).

Agency Approvals: This unit has "Not required" approval option; verify your site's requirements.

BluePLC Industrial offers this Bently Nevada 330191-00-33-05-00 as new, original equipment in factory packing, backed by a 12-month warranty. Contact us for current availability and to discuss your specific application needs.