Product Overview

The Bently Nevada 330906-02-12-05-02-05 is a 3300 NSv Reverse Mount Probe. This probe has increased chemical resistance compared to the 3300 RAM probe. Therefore, it suits many process compressor applications.

The side-view characteristics of the 3300 NSv probe are also superior to those of the 3000-series 190 probe. This advantage becomes apparent when gapping the 3300 NSv probe at the same distance from the probe target. Consequently, the 330906-02-12-05-02-05 provides more reliable measurements in side-view installations.

Ordering Information Breakdown

The 330906-02-12-05-02-05 follows a specific ordering code structure.

• 330906: 3300 NSv Reverse Mount Probe base model.

• 02-12: 3/8-24 UNF threads.

• 05: 0.5 meter (20 inches) total length.

• 02: Miniature coaxial ClickLoc connector with standard cable.

• 05: Multiple agency approvals.

General Specifications

The 330906-02-12-05-02-05 offers reliable proximity sensing with chemical resistance.

• Manufacturer: Bently Nevada.

• Product Type: 3300 NSv Reverse Mount Probe.

• Thread Size: 3/8-24 UNF.

• Total Length: 0.5 meter (20 inches).

• Connector Option: Miniature coaxial ClickLoc connector with standard cable.

• Agency Approval Option: Multiple approvals (-05).

• Country of Origin: Made in U.S.A.

System Weight (typical):

• Probe: Approximately 14 to 150 g (0.5 to 5.3 oz).

Probe DC Resistance

The 330906-02-12-05-02-05 has specific electrical characteristics.

• Probe Length: 0.5 meter.

• Resistance (RPROBE): 4.0 ± 0.5 ohms (from center conductor to outer conductor).

Linear Range and Gap Setting

The 3300 NSv proximity system provides a 1.5 mm linear range.

• Linear Range: 1.5 mm (60 mils).

• Linear Range Begins: Approximately 0.25 mm (10 mils) from target.

• Linear Range Extends: 0.25 to 1.75 mm (10 to 70 mils) (approximately -1 to -13 Vdc).

• Recommended Gap Setting: 1.0 mm (40 mils).

Field Wiring Guidelines

Field wiring connects the Proximitor Sensor to the monitor.

• Wire Size: 0.2 to 1.5 mm² (16 to 24 AWG).

• With Ferrules: 0.25 to 0.75 mm² (18 to 23 AWG).

• Recommendation: Use three-conductor shielded triad cable.

• Maximum Length: 305 meters (1,000 feet) between the 3300 XL NSv Proximitor Sensor and the monitor.

• Note: See frequency response graphs Figure 16 and Figure 17 for signal rolloff at high frequencies when using longer field wiring lengths.

Mechanical Specifications

The 330906-02-12-05-02-05 uses high-quality materials.

• Probe Tip Material: Polyphenylene sulfide (PPS).

• Probe Case Material: AISI 304 stainless steel (SST).

Probe Case Torque:

• Maximum Rated (Reverse mount probes): 22.6 N•m (200 in•lb).

• Recommended (Reverse mount probes): 7.5 N•m (66 in•lb).

Temperature Range

The 330906-02-12-05-02-05 handles extreme temperatures.

• Operating Temperature: -52°C to +177°C (-62°F to +351°F).

• Storage Temperature: -52°C to +177°C (-62°F to +351°F).

Important Note: Exposing the probe to temperatures below -34°C (-30°F) for a sustained period of time may cause premature failure of the pressure seal.

Pressure Specifications

The 330906-02-12-05-02-05 is designed for differential pressure sealing.

3300 NSv probes are designed to seal differential pressure between the probe tip and case. The probe sealing material consists of a Viton O-ring. Therefore, the probe maintains integrity in pressurized process environments.

Connector Features

The -02 connector option includes a miniature coaxial ClickLoc connector with standard cable (not FluidLoc). All components of the transducer system have gold-plated brass ClickLoc connectors. These connectors lock into place and prevent the connection from loosening.

Probe Construction Features

The 3300 NSv probe includes several patented design features.

TipLoc Molding Method:
Provides a robust bond between the probe tip and the probe body. This ensures long-term reliability.

Probe Case Configurations:
The 3300 NSv probe comes in varying probe case configurations. These include armored and unarmored 1/4-28, 3/8-24, M8x1 and M10x1 probe threads. The reverse mount 3300 NSv probe comes standard with either 3/8-24 or M10x1 threads.

Key Features

The 330906-02-12-05-02-05 offers several advantages for proximity measurement.

Increased Chemical Resistance:
Compared to the 3300 RAM probe, this probe resists chemicals better. Therefore, it suits many process compressor applications.

Superior Side-View Characteristics:
Side-view characteristics are superior to those of the 3000-series 190 probe. Consequently, gapping is more reliable at the same distance from the probe target.

Standard Cable Option:
The -02 option specifies standard cable (not FluidLoc). Therefore, this model is suitable for applications where oil leakage prevention is not required.

Gold-Plated ClickLoc Connectors:
Lock into place to prevent loosening. This ensures reliable connections under vibration.

Wide Temperature Range:
Operates from -52°C to +177°C. Hence, it suits extreme climate conditions.

Viton O-Ring Seal:
The probe sealing material consists of a Viton O-ring. This provides differential pressure sealing between the probe tip and case.

Multiple Agency Approvals:
The -05 suffix indicates multiple agency approvals. Consequently, this model is certified for use in hazardous areas worldwide.

Short Cable Length:
The 0.5 meter length suits installations where the Proximitor Sensor is mounted very close to the probe. As a result, cable management is simplified.

Typical Applications

The 330906-02-12-05-02-05 suits various turbomachinery monitoring applications.

• Process compressor radial vibration monitoring.

• Reverse mount installation where space is limited.

• Axial position measurement with 3/8-24 thread requirements.

• Side-view proximity measurements in tight machine clearances.

• Hazardous area installations requiring multiple approvals.

Installation Guidelines

Install the 330906-02-12-05-02-05 according to standard 3300 NSv proximity system practices. Use the recommended torque of 7.5 N•m (66 in•lb). Do not exceed the maximum rated torque of 22.6 N•m (200 in•lb).

Connect the miniature coaxial ClickLoc connector by pushing until it locks. The standard cable option does not include FluidLoc protection. Therefore, consider connector protectors in oil-wetted environments.

Set the initial gap to approximately 1.0 mm (40 mils). The linear range extends from 0.25 to 1.75 mm (10 to 70 mils). Avoid sustained operation below -34°C (-30°F) to prevent pressure seal failure.

Since this model has multiple agency approvals (-05), follow CSA, ATEX, or IECEx wiring practices for hazardous area installations.

What is in the Box

Please inspect all items upon delivery.

• Bently Nevada 330906-02-12-05-02-05 3300 NSv reverse mount probe.

• 3/8-24 UNF threads with locknut.

• Miniature coaxial ClickLoc connector with standard cable (0.5 meter).

• Viton O-ring for pressure sealing.

• Installation instruction manual.

Frequently Asked Questions (FAQ)

1. What is the thread size of the 330906-02-12-05-02-05?

The 330906-02-12-05-02-05 has 3/8-24 UNF threads. The -02-12 suffix in the part number indicates this thread option.

2. What is the total length of this probe?

The 330906-02-12-05-02-05 has a total length of 0.5 meter (20 inches). The -05 suffix indicates this length option.

3. What is the difference between the standard cable and FluidLoc options?

The -02 connector option specifies standard cable. FluidLoc (option -12) prevents oil leakage through the cable interior. The 330906-02-12-05-02-05 uses standard cable, so it does not have FluidLoc protection.

4. What is the recommended gap setting for this probe?

The recommended gap setting for the 330906-02-12-05-02-05 is 1.0 mm (40 mils). The linear range extends from 0.25 to 1.75 mm (10 to 70 mils).

5. What agency approvals does this probe hold?

The -05 suffix indicates multiple agency approvals. Therefore, the 330906-02-12-05-02-05 is certified for use in hazardous areas worldwide, including CSA, ATEX, and IECEx.