Product Overview
The Bently Nevada 330709-000-230-50-12-00 3300 XL 11 mm Proximity Probe is designed for precise shaft vibration and position measurement in rotating machinery. This 5.0-meter probe features a miniature coaxial ClickLoc connector with FluidLoc cable, ensuring reliable signal transmission even in harsh environments. Built with a polyphenylene sulfide tip and AISI 304 stainless steel case, it withstands temperatures from -52°C to +177°C. However, exposing the probe below -34°C may cause premature pressure seal failure—a critical consideration for cold climate operations.
Technical Specifications
Key specifications from the datasheet ensure accurate and repeatable measurements:
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Probe DC Resistance (5.0m): 7.2 ± 0.8 ohms (center to outer conductor)
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Cross-talk Limitation: Minimum target diameter 30.5 mm (1.2 in); minimum shaft diameter 152 mm (6.0 in)
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Probe Tip Material: Polyphenylene sulfide (PPS)
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Probe Case Material: AISI 304 stainless steel
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Probe Cable: 75 Ω triaxial, FEP insulated (1, 5, or 9 m lengths)
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Probe Case Torque (M16x1.5): Recommended 21.1 N·m (187 in·lb); maximum 63.3 N·m (560 in·lb)
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Connector-to-connector torque: Finger tight recommended; maximum 0.565 N·m (5 in·lb)
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Minimum Bend Radius: 25.4 mm (1.0 in)
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Thread: M16x1.5 with maximum engagement 24 mm
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Operating/Storage Temperature: -52°C to +177°C (-62°F to +351°F); avoid below -34°C to protect pressure seal
Real-World Applications
The Bently Nevada 330709-000-230-50-12-00 excels in environments where cross-talk and temperature extremes are common challenges. For example, in a steam turbine installation, the probe’s cross-talk limitation (minimum shaft diameter 152 mm) ensures accurate readings when multiple probes are mounted in close proximity. Its wide temperature range makes it suitable for outdoor compressor stations where ambient conditions vary from arctic cold to desert heat.
Installation Guidelines
Proper installation prevents common failure modes. When mounting the M16x1.5 probe case, apply a torque of 21.1 N·m (187 in·lb) – not exceeding the maximum 63.3 N·m to avoid thread damage. Ensure the connector is finger tight only, with a maximum torque of 0.565 N·m (5 in·lb) to prevent over-tightening. Maintain a minimum bend radius of 25.4 mm to avoid cable fatigue. The thread engagement should not exceed 24 mm. For cold climate installations, be aware that temperatures below -34°C can compromise the pressure seal; pre-warming the probe may be necessary.
Maintenance and Reliability
Regular inspection of the probe cable and connector is recommended. The FEP insulation resists chemicals, but mechanical damage must be avoided. Check the resistance from center to outer conductor periodically; it should be 7.2 ± 0.8 ohms for a 5.0m probe. The thermal schedule for EPL Ga/Gc and Dc classifications (provided in the datasheet) guides safe operation across temperature classes T1 through T5. For example, at T3 (120°C ambient), the probe can operate reliably with proper thermal management.
Troubleshooting Common Issues
Cross-talk is a typical problem when probes are too close to each other or to a small target. Always adhere to the minimum target and shaft diameters. If erratic readings occur, verify the probe resistance and check for cable damage. Over-torqueing the probe case or connector can cause thread galling or connector failure. Use a torque wrench for installation. If the probe is exposed to temperatures below -34°C, the pressure seal may fail; allow the probe to warm gradually if such exposure has occurred.
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