11mm Proximity Probe Bently Nevada 330708-00-24-90-01-05

Bently Nevada 330708-00-24-90-01-05 – 3300 XL 11mm Proximity Probe

Product Introduction

The Bently Nevada 330708-00-24-90-01-05 belongs to the renowned 3300 XL series of proximity probes. This 11 mm sensor is specifically engineered for non-contact vibration and position measurement of rotating machinery. Therefore, it serves as a critical component in predictive maintenance systems for turbines, compressors, and pumps. This particular variant stands out with its 2.4-inch overall case length, which provides greater mounting flexibility in deep bore applications. Additionally, it includes a connector protector for enhanced reliability in harsh conditions.

Core Technical Parameters

This Bently Nevada 330708 probe incorporates a Polyphenylene sulfide (PPS) tip, offering outstanding resistance to chemicals and mechanical abrasion. Furthermore, the probe case is manufactured from AISI 304 stainless steel (SST) to deliver robust corrosion protection. The probe comes equipped with a 75 Ω triaxial FEP-insulated cable that extends to a total length of 9.0 meters. For signal integrity, the DC resistance from the center conductor to the outer conductor is specified at 8.5 ± 1.1 ohms. The assembly features a miniature coaxial ClickLoc connector with a built-in connector protector, which shields the connection from dirt and moisture. Moreover, agency approval option 05 confirms this model holds multiple international certifications.

Environmental and Mechanical Specifications

The operating and storage temperature range spans from -51°C to +177°C (-60°F to +351°F). However, users should note that prolonged exposure below -34°C (30°F) can shorten the pressure seal's service life. The probe case thread is 5/8-18 UNF, with a maximum thread engagement of 0.938 inches. For installation, the recommended torque is 15.2 N•m (133 in•lb), while the maximum allowable torque is 45.2 N•m (400 in•lb). Meanwhile, the connector should only be finger-tightened, not exceeding 0.565 N•m (5 in•lb). Additionally, the cable's minimum bend radius is 25.4 mm (1.0 inch), regardless of whether stainless steel armor is present. The overall case length option 24 means this probe measures 2.4 inches, offering deeper reach for specific mounting configurations.

Installation Best Practices

First, confirm that the mounting hole is clean and correctly tapped for the 5/8-18 UNF thread. Next, thread the Bently Nevada 330708 probe into the housing while monitoring the gap voltage with a compatible proximity system. Specifically, apply a torque wrench set to 15.2 N•m to achieve optimal tightness without overstressing the case. Then, attach the ClickLoc connector by turning it finger-tight only; do not use any tools that might damage the connector protector. For cable routing, ensure all bends maintain a radius larger than 25.4 mm to prevent internal conductor damage. Finally, verify the electrical integrity by measuring the resistance between the center and outer conductors, which should read 8.5 ± 1.1 ohms. The longer 2.4-inch case provides additional thread engagement options for deep-well installations.

Packaging and Logistics

Each package includes the following items:

• 1 x Bently Nevada 330708-00-24-90-01-05 probe assembly with 9‑meter cable

• 1 x ClickLoc connector with connector protector (factory-installed)

• 1 x Installation reference sheet

All shipments are dispatched worldwide via FedEx, UPS, or DHL to ensure rapid and trackable delivery. Calibration certificates and warranty documents are not included in this standard packaging.

Frequently Asked Questions

1. What is the advantage of the 2.4-inch case length on this Bently Nevada 330708 probe?
The longer case provides greater mounting depth flexibility. It is particularly useful when the mounting hole is recessed or when you need additional thread engagement for secure installation.

2. What does the connector protector do on this 3300 XL probe?
The connector protector shields the ClickLoc connection from environmental contaminants like dust, moisture, and oil. This feature enhances long-term reliability in demanding industrial settings.

3. Is this probe suitable for hazardous area installations?
Yes, agency approval option 05 indicates this model carries multiple certifications. Please verify with your local safety authority that the specific approvals meet your site requirements.

4. Can I extend the 9‑meter cable of this proximity probe?
Yes, you can use Bently Nevada extension cables. However, you must recalculate the total system resistance to maintain accurate measurement readings.

5. What is the minimum bend radius for the probe cable?
The minimum bend radius is 25.4 mm (1.0 inch) for both armored and unarmored versions. Exceeding this limit may degrade signal quality or cause permanent cable damage.