Product Overview
When machine vibration threatens production uptime, the Bently Nevada 330101-20-39-10-02-CN 3300 XL 8 mm Probe delivers reliable, precise measurement. This industrial automation module is designed for continuous monitoring of rotating machinery, providing the data needed to detect early signs of mechanical trouble.
Part of the trusted 3300 XL series, this probe features a 3/8-24 UNF thread and comes without armor. Its compact 8 mm design offers a thicker encapsulation of the probe coil in molded PPS plastic, resulting in a more rugged and durable sensor. The probe body's larger diameter adds strength, making it an excellent choice for demanding industrial environments.
Key options for this unit include a 2.0-inch unthreaded length, a 3.9-inch overall case length, and a 1.0-meter total length. It uses a miniature coaxial ClickLoc connector with standard cable, ensuring a secure and reliable connection. This probe is made in the U.S.A.
Key Features & Benefits
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Patented TipLoc molding – Provides a robust bond between probe tip and body, reducing the risk of mechanical failure.
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CableLoc design – Offers 330 N (75 lbf) pull strength, securely attaching the cable and tip to withstand industrial vibration.
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Optional FluidLoc cable – Prevents oil and other liquids from leaking out of the machine through the cable interior, protecting your equipment.
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8 mm probe design – Thicker PPS encapsulation and larger body diameter deliver superior robustness against physical abuse.
Technical Specifications
| Parameter |
Value |
| Probe Type |
3300 XL 8 mm Probe, 3/8-24 UNF thread, without armor |
| Unthreaded Length Option |
20 – 2.0 in |
| Overall Case Length Option |
39 – 3.9 in |
| Total Length Option |
10 – 1.0 metre (3.3 feet) |
| Connector and Cable Type |
Miniature coaxial ClickLoc connector, standard cable |
| Agency Approval Option |
Approvals country specific |
| Nominal Probe DC Resistance (1.0 m) |
7.59 ± 0.50 Ω |
| Extension Cable Capacitance |
69.9 pF/m (21.3 pF/ft) typical |
| Field Wiring |
0.2 to 1.5 mm² (16 to 24 AWG), 3-conductor shielded triad, max 305 m (1,000 ft) between Proximitor and monitor |
| Linear Range |
2 mm (80 mils), begins at ~0.25 mm (10 mils) from target, 0.25 to 2.3 mm (10 to 90 mils) |
| Recommended Gap Setting for Radial Vibration |
-9 Vdc (approx. 1.27 mm / 50 mils) |
| Incremental Scale Factor (ISF) |
7.87 V/mm (200 mV/mil) ±5% (1/5 m system) or ±6.5% (9 m / ETR) |
| Deviation from Best Fit Straight Line (DSL) |
±0.025 mm (1 mil) for 1/5 m; ±0.038 mm (1.5 mil) for 9 m and ETR |
| Probe Tip Material |
Polyphenylene sulfide (PPS) |
| Probe Case Material |
AISI 303 or 304 stainless steel (SST) |
| Weight |
323 g/m (11.4 oz) |
| Operating/Storage Temperature (Standard) |
-52°C to +177°C (-62°F to +350°F) |
| Operating/Storage Temperature (Extended) |
-52°C to +218°C (-62°F to +425°F) probe tip; -51°C to +260°C (-60°F to +500°F) cable/connector |
| Relative Humidity |
<3% change in ASF when tested at 93% RH per IEC 68-2-3 for 56 days |
Real-World Applications
The Bently Nevada 330101-20-39-10-02-CN is ideal for monitoring radial vibration in turbomachinery, pumps, compressors, and electric motors. Its robust construction and high accuracy make it a preferred choice in industries such as power generation, oil and gas, and manufacturing.
For example, in a steam turbine train, this probe provides continuous vibration data that helps operators avoid catastrophic failures and schedule maintenance proactively. The probe's linear range and scale factor ensure precise readings across a wide operating envelope.
Installation & Setup Guidance
Proper installation is critical for optimal performance. When mounting the 330101-20-39-10-02-CN, ensure the target surface is clean and the probe is positioned within the recommended gap setting (-9 Vdc). Use the specified field wiring (0.2 to 1.5 mm², shielded triad) and keep cable lengths within the 305-meter limit to avoid signal rolloff.
Secure the probe using the 3/8-24 UNF thread, and use the ClickLoc connector for a reliable connection. For applications requiring pressure sealing, note that this probe uses a Viton O-ring and is not pressure-tested before shipment; contact the manufacturer if pressure testing is required.
Maintenance & Reliability
Regular inspection of the probe and cable is recommended to ensure long-term reliability. Check for physical damage, especially at the probe tip and cable connections. The patented CableLoc design provides high pull strength, but avoid excessive bending or stress on the cable during operation.
Temperature extremes can affect performance. Standard probes operate from -52°C to +177°C, while extended-range versions handle up to +218°C at the tip. Avoid exposing the probe to temperatures below -34°C to prevent premature seal failure.
Selection Guide & Purchasing Advice
Before ordering, verify the exact options you need: unthreaded length, overall case length, total length, connector type, and agency approvals. This model (330101-20-39-10-02-CN) is configured as described, but custom variants are available. For assistance in selecting the right probe for your application, contact PLC Source PRO—your trusted source for industrial automation spares.