Bently Nevada 330708-00-10-50-11-05 Probe 11mm

Product Introduction

The Bently Nevada 330708-00-10-50-11-05 is a high-performance 11 mm proximity probe designed for non-contact vibration and position measurement. This 3300 XL series probe uses a 5/8-18 UNF thread with an unthreaded length of 0 inches and an overall case length of 1.0 inch. Its total length reaches 5.0 meters (16.4 feet), providing flexible installation options. Additionally, the probe incorporates a miniature coaxial ClickLoc connector with a connector protector and FluidLoc cable technology. This FluidLoc feature prevents oil and other liquids from leaking through the cable interior, making it particularly suitable for turbine and compressor applications. Furthermore, the probe carries multiple agency approvals, ensuring compliance with international standards.

Technical Specifications for the 330708-00-10-50-11-05

The Bently Nevada 330708-00-10-50-11-05 delivers precise electrical performance for reliable proximity measurements. The probe DC resistance from the center conductor to the outer conductor (RPROBE) measures 7.2 ± 0.8 Ω at 5.0 meters. This consistent resistance ensures stable signal transmission across the full cable length. Moreover, the probe uses a 75 Ω triaxial, FEP-insulated cable that maintains signal integrity even in electrically noisy environments.

For power and output, this probe integrates with the 3300 XL Proximitor Sensor system. The system requires -17.5 Vdc to -26 Vdc supply voltage and draws a maximum of 12 mA. Supply sensitivity stays below 2 mV per volt change, which preserves measurement accuracy. Consequently, you obtain stable vibration and position data for predictive maintenance programs.

Mechanical and Environmental Durability

The Bently Nevada 330708-00-10-50-11-05 is built for demanding industrial environments. The probe tip uses Polyphenylene sulfide (PPS), a high-performance engineering plastic that resists chemicals and heat. Meanwhile, the probe case is constructed from AISI 304 stainless steel, offering excellent corrosion resistance. The probe operates and stores reliably across a wide temperature range from -51°C to +177°C (-60°F to +351°F). However, exposing the probe to temperatures below -34°C (-30°F) may cause premature failure of the pressure seal, so exercise caution in cold environments.

The probe case thread measures 5/8-18 UNF with a maximum thread engagement of 0.938 inches. For installation, the recommended case torque is 15.2 N•m (133 in•lb), while the maximum rated torque is 45.2 N•m (400 in•lb). Additionally, the connector-to-connector torque should be finger tight, with a maximum of 0.565 N•m (5 in•lb). The minimum bend radius for the cable is 25.4 mm (1.0 inch), whether armored or unarmored. Therefore, careful installation ensures long-term reliability.

FluidLoc Cable and Connector Design

The Bently Nevada 330708-00-10-50-11-05 includes the FluidLoc cable option, which prevents oil and other liquids from leaking out of the machine through the cable interior. This feature is critical for turbine and compressor applications where oil ingress can compromise measurement accuracy and lead to costly downtime. Additionally, the probe uses a miniature coaxial ClickLoc connector with a connector protector. The ClickLoc design ensures a secure, vibration-resistant connection that simplifies installation and reduces the risk of accidental disconnection. Furthermore, the connector protector shields the connection point from contamination and mechanical damage.

Probe Pressure Sealing and Performance

3300 XL 11 mm probes are designed to seal differential pressure between the probe tip and case. The sealing material consists of a Viton® O-ring, which provides excellent resistance to heat and chemicals. However, note that the factory does not pressure-test each probe prior to shipment. If your application requires specific pressure seal verification, contact the custom design department to arrange testing. Additionally, humidity testing per IEC 68-2-3 shows less than 3% change in Average Scale Factor (ASF) after 56 days at 93% relative humidity. Thus, this probe performs consistently even in high-humidity environments.

Installation Guidelines for the 330708-00-10-50-11-05

Proper installation of the Bently Nevada 330708-00-10-50-11-05 ensures optimal system performance. First, follow installation drawing 140979 for nonincendive circuit connections. For field wiring, use 0.2 to 1.5 mm² (16 to 24 AWG) tinned copper conductors. We recommend using 3-conductor shielded triad cable to minimize noise interference. The maximum field wiring distance between the Proximitor Sensor and the monitor is 305 meters (1,000 feet). For longer runs, consult the frequency response graphs (Figures 10 and 12) to assess signal rolloff at high frequencies.

When mounting the probe, set the gap at approximately 1.27 mm (50 mils) for optimal linear range. The linear measurement range spans from 0.25 mm to 2.3 mm (10 to 90 mils), producing an output of -1 to -17 Vdc. Apply the recommended case torque of 15.2 N•m (133 in•lb) to avoid damaging the threads or housing. For the ClickLoc connector, tighten it finger tight only—do not exceed 0.565 N•m (5 in•lb).

Performance and System Compatibility

This probe is designed exclusively for 3300 XL 8 mm and 11 mm component systems. All performance specifications are validated using an AISI 4140 steel target at 18–27°C, with a -24 Vdc power supply and 10 kΩ load. Using non-standard target materials may reduce system accuracy and interchangeability. Therefore, always calibrate your system with Bently Nevada's recommended target material.

The patented TipLoc molding method ensures a robust bond between the probe tip and probe body. Similarly, CableLoc technology enhances pull strength to 330 N (75 lbf). Consequently, these design improvements extend service life and minimize measurement errors caused by loose connections.

Packaging List for 330708-00-10-50-11-05

• One (1) Bently Nevada 330708-00-10-50-11-05 11 mm proximity probe, 5.0 meters

• One (1) connector protector (pre-installed on ClickLoc connector)

• Installation instruction sheet (quick start guide)

Frequently Asked Questions (FAQ)

1. Can the Bently Nevada 330708-00-10-50-11-05 be used in high-temperature turbine applications?
Yes. This probe operates up to +177°C (+351°F), making it suitable for most turbine and compressor environments. However, avoid prolonged exposure below -34°C (-30°F) to protect the pressure seal.

2. What approvals does the 330708-00-10-50-11-05 carry?
The "05" agency approval option indicates multiple approvals, including CSA, ATEX, and IECEx. Always verify current certification status for your specific region.

3. How does FluidLoc technology benefit my application?
FluidLoc prevents oil and other liquids from leaking through the cable interior. This feature is essential for oil-lubricated machinery, as it eliminates a common failure point and reduces maintenance costs.

4. Can I use this probe with a non-Bently Nevada sensor system?
Full accuracy and interchangeability are guaranteed only with 3300 XL 8 mm or 11 mm component systems. Using other systems may degrade performance.

5. What is the recommended torque for installing the 330708-00-10-50-11-05?
Apply 15.2 N•m (133 in•lb) for the probe case. For the ClickLoc connector, tighten it finger tight only—maximum torque is 0.565 N•m (5 in•lb).