Bently Nevada 330906-02-12-05-02-CN Reverse Mount Probe Overview

The Bently Nevada 330906-02-12-05-02-CN is a 3300 NSv reverse mount probe made in the USA. This probe features 3/8-24 UNF threads for secure installation in imperial threaded ports. Total length option 05 provides 0.5 meter (20 inches) of cable for short-reach applications. Connector option 02 specifies a miniature coaxial ClickLoc connector with standard cable. Agency approval option CN indicates country specific certifications. Therefore, verify local acceptance before installing this version in hazardous areas. Compared to the 3300 RAM probe, the NSv probe offers increased chemical resistance. As a result, this probe works well in many process compressor applications.

Technical Specifications

The Bently Nevada 330906-02-12-05-02-CN has a linear range of 1.5 mm (60 mils) . Specifically, the linear range begins at approximately 0.25 mm (10 mils) from the target. It then extends from 0.25 to 1.75 mm (10 to 70 mils) . This corresponds to approximately -1 to -13 Vdc output. The recommended gap setting is 1.0 mm (40 mils) for optimal performance.

Now consider the probe DC resistance specifications. For the 330906-02-12-05-02-CN with 0.5 meter length, resistance from the center conductor to the outer conductor (RPROBE) is 4.0 ± 0.5 ohms. This consistent resistance ensures reliable signal transmission.

Field wiring requirements are also important for proper installation. Use 0.2 to 1.5 mm² (16 to 24 AWG) wire. When using ferrules, the range becomes 0.25 to 0.75 mm² (18 to 23 AWG) . Three-conductor shielded triad cable is recommended for best performance. Maximum cable length between the Proximitor sensor and monitor reaches 305 meters (1,000 feet) . However, check the frequency response graphs for signal rolloff at high frequencies when using longer lengths.

Mechanical Specifications

The Bently Nevada 330906-02-12-05-02-CN uses high quality materials throughout. Probe tip material is Polyphenylene sulfide (PPS) for chemical resistance. Probe case material is AISI 304 stainless steel (SST) for durability. The maximum rated torque for reverse mount probes is 22.6 N•m (200 in•lb) . However, the recommended torque is only 7.5 N•m (66 in•lb) . Therefore, do not overtighten during installation. Maximum length of thread engagement for 3/8-24 threads is comparable to M10x1 specifications. System weight varies from approximately 14 to 150 g (0.5 to 5.3 oz) depending on configuration. This short 0.5 meter version weighs approximately 80 grams.

Thread & Connector Details

The Bently Nevada 330906-02-12-05-02-CN uses 3/8-24 UNF threads for imperial installations. The reverse mount 3300 NSv probe comes standard with either 3/8-24 or M10X1 threads. Therefore, this model suits North American and other imperial thread applications. All components of the transducer system use gold-plated brass ClickLoc connectors. These ClickLoc connectors lock into place when mated. As a result, they prevent the connection from loosening due to vibration. This feature is critical for rotating machinery applications.

In addition, the patented TipLoc molding method provides a robust bond between the probe tip and the probe body. This eliminates a common failure point found in other probe designs. The connector option 02 provides a standard cable without FluidLoc sealing.

Temperature & Pressure Ratings

The Bently Nevada 330906-02-12-05-02-CN operates across an extremely wide temperature range. Specifically, operating temperature spans -52°C to +177°C (-62°F to +351°F) . Storage temperature is equally broad at -52°C to +177°C (-62°F to +351°F) . However, note an important limitation. Exposing the probe to temperatures below -34°C (-30°F) for a sustained period may cause premature seal failure. Therefore, avoid prolonged cold exposure below this threshold.

Regarding pressure capabilities, 3300 NSv probes seal differential pressure between the probe tip and case. The probe sealing material consists of a Viton O-ring for chemical compatibility. This design suits many process compressor environments.

Key Features & Benefits

• 3/8-24 UNF threads – The 330906-02-12-05-02-CN fits imperial threaded ports directly.

• Increased chemical resistance – Outperforms RAM probes in harsh process compressor media.

• Superior side-view characteristics – Better performance than 3000-series 190 probes at same gap distance.

• ClickLoc connector – Gold-plated brass connector locks firmly to prevent loosening.

• TipLoc molding method – Patented technology creates a robust probe tip to body bond.

• Short cable length – 0.5 meter length suits tight installations with nearby Proximitor sensors.

• Country specific approvals – CN option provides certifications for various international locations.

Installation Guidelines

Follow these steps to install the Bently Nevada 330906-02-12-05-02-CN correctly. First, clean the 3/8-24 UNF mounting hole threads thoroughly before installation. Second, apply anti-seize compound to the probe threads if recommended. Third, thread the probe into the mounting hole by hand initially. Fourth, tighten the probe to the recommended torque of 7.5 N•m (66 in•lb) . Do not exceed the maximum rated torque of 22.6 N•m. Fifth, connect the ClickLoc connector to the extension cable until it clicks into place. Finally, verify the gap setting is approximately 1.0 mm (40 mils) from the target.

Use three-conductor shielded triad cable for field wiring between the Proximitor and monitor. Keep field wiring length under 305 meters (1,000 feet) for best signal integrity. Above all, avoid sustained operation below -34°C to protect the Viton O-ring pressure seal. Follow all local electrical codes for country specific approval requirements.

Package Contents

Your shipment includes the following items:

• 1 x Bently Nevada 330906-02-12-05-02-CN NSv reverse mount probe

• 1 x Installation instruction sheet with torque specifications

• 2 x Replacement Viton O-rings for pressure seal maintenance

• 1 x ClickLoc connector dust cap for protection when disconnected

• 1 x Country specific approval documentation sheet

No extension cable or Proximitor sensor is included with this probe. Therefore, you must order these separately based on your system requirements. Likewise, no mounting hardware is provided.

Frequently Asked Questions (FAQ)

1. What thread type does this probe use?
The Bently Nevada 330906-02-12-05-02-CN uses 3/8-24 UNF threads. This imperial thread size suits North American standard mounting ports.

2. What is the difference between reverse mount and standard probes?
Reverse mount probes like the 330906-02-12-05-02-CN install from the outside of the machine casing. Therefore, they suit applications where internal access is limited.

3. What does the CN agency approval mean?
The CN option indicates country specific approvals for the 330906-02-12-05-02-CN. Therefore, check local requirements before installation in hazardous locations.

4. Why is the minimum operating temperature limited to -34°C for long periods?
Extended exposure below -34°C may cause premature failure of the Viton O-ring pressure seal. Therefore, avoid sustained low temperature operation with the 330906-02-12-05-02-CN.

5. How do I know when the ClickLoc connector is fully engaged?
The ClickLoc connector produces an audible "click" sound when fully locked. Additionally, you will feel a tactile snap as the connector engages properly.

Why Choose the Bently Nevada 330906-02-12-05-02-CN?

This 3300 NSv reverse mount probe delivers superior performance with imperial thread compatibility. For starters, the Bently Nevada 330906-02-12-05-02-CN features 3/8-24 UNF threads for North American installations. Its increased chemical resistance outperforms RAM probes in process compressor applications. The side-view characteristics also exceed those of the older 3000-series 190 probes. Furthermore, the 0.5 meter cable length suits installations with nearby Proximitor sensors. ClickLoc connectors with gold-plated brass construction prevent vibration loosening. The patented TipLoc molding method ensures a durable probe tip bond. Additionally, the wide temperature range from -52°C to +177°C suits extreme environments. The CN agency approval option provides country specific certifications for various international locations. Most importantly, the Viton O-ring seals differential pressure effectively for compressor applications.

Order the Bently Nevada 330906-02-12-05-02-CN today for your reverse mount proximity measurement needs. This probe is perfect for process compressors, steam turbines, and other rotating equipment requiring 3/8-24 UNF threads and country specific approvals.