3300 NSv Proximity Probe 330908-12-20-50-02-00 Bently Nevada

Bently Nevada 330908-12-20-50-02-00 3300 NSv Proximity Probe

Product Introduction

The Bently Nevada 330908-12-20-50-02-00 belongs to the trusted 3300 NSv series of proximity probes. Specifically, this model provides a reliable solution for measuring vibration and relative position on rotating machinery like turbines and compressors. Furthermore, its robust construction ensures stable performance in demanding industrial environments. This particular variant offers a 5.0-meter total cable length for flexible installation options.

Technical Specifications

The 330908-12-20-50-02-00 sensor is built with a probe case made from durable AISI304 stainless steel (SST). Additionally, its probe tip uses high-performance Polyphenylene sulfide (PPS) material. This specific model features an unthreaded length of 1.2 inches and an overall case length of 2.0 inches. The total length option of 50 indicates a 5.0-meter (16.4 feet) cable. Meanwhile, the connector and cable option is 02, which denotes a miniature coaxial ClickLoc connector with a standard 75 Ω coaxial cable. The cable insulation is fluorinated ethylene propylene (FEP), providing excellent chemical resistance. The agency approval option is 00, confirming that no special certifications are required.

Electrical & Mechanical Parameters

For the Bently Nevada 330908 probe, the DC resistance from the center conductor to the outer conductor (RPROBE) is 5.3 ± 0.7 ohms for the 5.0-meter length. Consequently, this ensures signal integrity during operation. The recommended torque for the 3/8-24 UNF probe case is 11.3 N•m (100 in•lb) , while the maximum rated torque is 33.9 N•m (300 in•lb) . Moreover, the maximum length of thread engagement for this case is 0.563 inches. Its operating and storage temperature range is from -52°C to +177°C (-62°F to +351°F). However, please note that sustained exposure below -34°C (-30°F) may cause premature seal failure. The probe is also designed to seal differential pressure using a Viton O-ring.

Installation Guidance

When installing the 3300 NSv probe, always adhere to the recommended torque settings to avoid damage. First, ensure the target surface is clean and within the specified gap range. Next, carefully thread the 3/8-24 UNF probe into the mounting fixture, taking care not to cross-thread it. Then, tighten the probe to 11.3 N•m using a suitable torque wrench. Remember, the maximum thread engagement length is 0.563 inches, so do not over-tighten beyond this limit. For optimal performance, maintain the ambient temperature within the -52°C to +177°C range. Also, be cautious about operating below -34°C for extended periods, as this can compromise the pressure seal's integrity.

Packaging List

• Bently Nevada 330908-12-20-50-02-00 Proximity Probe (1 unit)

• Protective cap for the probe tip

• Installation instruction sheet

Frequently Asked Questions (FAQ)

1. Is the Bently Nevada 330908 probe compatible with a 5-meter extension cable?
Yes, the 330908-12-20-50-02-00 is designed to work with standard Bently Nevada extension cables. However, you must ensure that the total system length (probe + extension) does not exceed the driver's specified limits for optimal accuracy.

2. What is the function of the ClickLoc connector on this 3300 NSv probe?
The ClickLoc connector provides a secure, positive-locking connection between the probe and its extension cable. It prevents accidental disconnection due to vibration, which is crucial for maintaining a reliable signal in rotating machinery applications.

3. Can this 3300 NSv probe be used in a hazardous area?
The 330908-12-20-50-02-00 with agency approval option 00 does not carry intrinsic safety or explosion-proof certifications. For hazardous area installations, please select a variant with the appropriate agency approval option.

4. How do I verify the correct gap for this Bently Nevada proximity probe?
The correct gap is typically set by adjusting the probe position until the output voltage from the driver is at the mid-point of its linear range (usually around -10 Vdc). Refer to your system's calibration chart for the specific voltage-to-distance relationship.

5. What happens if the probe is exposed to temperatures below -34°C?
While the probe can operate down to -52°C, prolonged exposure to temperatures below -34°C can cause the Viton O-ring seal to harden and fail prematurely. This may lead to a loss of pressure sealing capability between the probe tip and case.