Product Overview
The Bently Nevada 330708-00-10-90-11-00 is a precision 3300 XL 11 mm proximity probe designed for non-contact vibration and position measurement in rotating machinery. This probe uses a 5/8-18 UNF thread, features a 9-meter (29.5 feet) total length with a miniature coaxial ClickLoc connector and FluidLoc cable, and requires no agency approval (option 00). Its robust construction—with a polyphenylene sulfide (PPS) tip and AISI 304 stainless steel case—ensures reliable performance in demanding industrial environments.
When vibration monitoring fails due to cable fatigue or thermal stress, the 330708-00-10-90-11-00 addresses these failure modes head-on. Its 75 Ω triaxial FEP-insulated cable resists chemical attack and temperature extremes, while the sealed probe prevents differential pressure leaks. This section focuses on how the probe prevents common failure points in proximity sensing.
Technical Specifications
| Parameter |
Value |
| Probe Type |
3300 XL 11 mm, 5/8-18 UNF thread, without armor |
| Unthreaded Length Option |
00 = 0 in |
| Overall Case Length Option |
10 = 1.0 in |
| Total Length Option |
90 = 9.0 meters (29.5 feet) |
| Connector and Cable-Type Option |
11 (Miniature coaxial ClickLoc with connector protector, FluidLoc cable) |
| Agency Approval Option |
00 - Not required |
| Probe Tip Material |
Polyphenylene sulfide (PPS) |
| Probe Case Material |
AISI 304 stainless steel |
| Probe Cable Specification |
75 Ω triaxial, fluoroethylene propylene (FEP) insulated; lengths: 1, 5, or 9 meters |
| Operating and Storage Temperature |
-51°C to +177°C (-60°F to +351°F) |
| Probe DC Resistance (9.0 m length) |
8.5 ± 1.1 ohms (center conductor to outer conductor) |
| Probe Case Thread |
5/8-18 UNF |
| Max Length of Thread Engagement (5/8-18) |
0.938 in |
| Probe Case Torque (Max) / (Recommended) |
45.2 N·m (400 in·lb) / 15.2 N·m (133 in·lb) |
| Connector-to-Connector Torque (Max) / (Recommended) |
0.565 N·m (5 in·lb) / Finger tight |
| Minimum Bend Radius (with or without SST armor) |
25.4 mm (1.0 in) |
| Shipping Weight |
0.17 kg |
Real-World Applications
The Bently Nevada 330708-00-10-90-11-00 excels in vibration monitoring for steam turbines, centrifugal compressors, pumps, and large electric motors. In a typical steam turbine application, the probe mounts radially to measure shaft relative vibration. Its 11 mm sensing face and 5/8-18 thread provide secure installation, while the 9-meter cable reaches remote junction boxes without signal degradation.
In a chemical processing plant, the probe’s PPS tip and FEP cable resist corrosive vapors, preventing premature failure common with standard sensors. The ClickLoc connector simplifies replacement, reducing downtime during scheduled maintenance.
Installation and Setup Guidance
Proper installation is critical for accurate readings. Follow these steps using Bently Nevada 330708-00-10-90-11-00 specifications:
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Thread and torque: Use the 5/8-18 UNF thread with maximum engagement of 0.938 in. Tighten the probe case to 15.2 N·m (133 in·lb) recommended torque—never exceed 45.2 N·m.
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Cable routing: Maintain minimum bend radius of 25.4 mm (1.0 in) to avoid damaging the FEP insulation. Secure the cable away from heat sources and moving parts.
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Connector handling: Finger-tighten the ClickLoc connector; maximum torque is only 0.565 N·m (5 in·lb). Overtightening can damage the coaxial connection.
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Temperature caution: Avoid exposing the probe to temperatures below -34°C (-30°F) during installation, as this may cause premature pressure seal failure.
Maintenance and Reliability
The Bently Nevada 330708-00-10-90-11-00 requires minimal routine maintenance. Inspect the cable and connector for wear during every shutdown. Check the O-ring pressure seal if the probe is removed and re-installed. The Viton O-ring (part of probe sealing material) should be replaced if any signs of hardening or cracking appear. Operating within -51°C to +177°C ensures long service life. Periodic resistance checks (center conductor to outer conductor) should read 8.5 ± 1.1 ohms for a 9-meter probe; deviations indicate cable damage or connector loosening.
Troubleshooting Common Issues
Below are common failure modes for proximity probes and how the Bently Nevada 330708-00-10-90-11-00 addresses them:
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Open or short circuit: The 75 Ω triaxial cable with FEP insulation resists breakage, but if resistance readings fall outside 8.5 ± 1.1 ohms, inspect the ClickLoc connector for corrosion or damage.
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Temperature-induced drift: The probe’s wide temperature range (-51°C to +177°C) ensures stable sensitivity. However, avoid rapid temperature changes below -34°C to protect the pressure seal.
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Mechanical loosening: Adhere to the recommended torque of 15.2 N·m. Use thread-locking compound if vibration levels are high.
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Fluid ingress: The FluidLoc cable and sealed connector prevent moisture entry. Verify the connector protector is installed and tight.
Selection Guide and Purchasing Advice
When ordering the Bently Nevada 330708-00-10-90-11-00, verify your machine’s thread size (5/8-18 UNF) and required cable length. This probe includes the 9-meter cable; other lengths (1 m, 5 m) are available in the 3300 XL series. Ensure your monitoring system accepts 3300 XL series probes with ClickLoc connectors. For inquiries or to place an order, visit ubest101—your reliable automation parts supplier.