Product Overview

The Bently Nevada 330901-00-90-10-01-CN is a high-precision proximity probe belonging to the 3300 NSv (Narrow Side View) series. This transducer system is specifically engineered for applications with tight physical constraints or where the target surface is small, such as centrifugal compressors, pumps, and small turbines. The NSv series is designed to minimize "side-view" effects, allowing the probe to be used in proximity to neighboring metallic surfaces that would interfere with standard 8 mm probes.

This specific model features a 1/4-28 UNF thread and is configured with a 9.0-inch overall case length and a 1.0-metre total length. It is supplied without stainless steel armor on the cable and includes a miniature coaxial ClickLoc connector with a connector protector. The "CN" suffix indicates compliance with ATEX/IECEx and Chinese NEPSI hazardous area standards, making it suitable for global and domestic Chinese industrial projects.

Hardware Configuration

Ordering Information

This part number is generated based on a specific configuration of the 330901 base model. Ensure all suffix codes match existing field documentation before ordering.

Installation & Engineering Notes

Target Material and Surface Finish:

The 3300 NSv system is factory-calibrated for AISI 4140 steel. If the target shaft is made of a different material, the Proximitor sensor output will require recalibration or a scale factor adjustment. The target area should be at least 1.5 times the probe tip diameter (approx. 9.5 mm / 0.375 in) to ensure a linear output.

Mounting Clearances:

The NSv series is designed for tight spaces; however, a minimum side clearance of 1.5 mm (0.06 in) from the probe tip to surrounding metallic objects must be maintained to prevent signal distortion. When installing the 9.0-inch case, ensure the probe is not over-torqued into the mounting bracket; recommended torque for 1/4-28 UNF threads is 2.3 N·m (20 in·lb).

Cable Protection and Routing:

This model (-01) is supplied without armor. In environments with high mechanical risk or chemical exposure, the cable should be protected using a dedicated flexible conduit. All coaxial connections must be kept clean and dry. The ClickLoc connector protector must be properly seated to maintain signal integrity and prevent environmental contamination.

Hazardous Area Compliance:

The "CN" approval code is mandatory for installations within the People's Republic of China requiring NEPSI certification. For global projects, the ATEX and IECEx markings ensure the probe can be used in intrinsically safe (IS) circuits when paired with an approved Proximitor sensor and safety barrier.

Troubleshooting FAQ

Q: Can a 3300 NSv probe be used with a standard 3300 XL Proximitor?

A: No. 3300 NSv probes require a dedicated 3300 NSv Proximitor sensor. Using a standard 3300 XL Proximitor will result in incorrect sensitivity and non-linear data.

Q: What is the maximum recommended distance between the probe and Proximitor?

A: The total length of the probe plus the extension cable must match the Proximitor sensor’s design (typically 5.0 or 7.0 metres). This specific probe is 1.0 metre; thus, a 4.0 or 6.0 metre extension cable is required.

Q: How do I identify a faulty ClickLoc connector?

A: If the vibration signal shows high-frequency "spiking" or the DC gap voltage is unstable, inspect the miniature coaxial center pin. Ensure the connector protector is not cracked and that no moisture has entered the junction.